WO2018157766A1 - Multi-unit modified sequencing batch reactor and applications thereof - Google Patents

Abstract

A multi-unit modified sequencing batch reactor. The multi-unit modified sequencing batch reactor comprises an anaerobic reaction unit (4), a first anoxic reaction unit (5), a mud-water separation unit (2), an aerobic unit (6), a first sequencing batch unit (1) and a second sequencing batch unit (7), and also comprises a pre-anoxic unit (3), a second anoxic reaction unit (5A), a first anoxic/aerobic reaction unit (1A) and second anoxic/aerobic reaction unit (7A). The modified sequencing batch reactor can make full use of a carbon source of raw water, can improve the total nitrogen removal rate, is especially applicable to the treatment of wastewater of a low ratio of carbon to nitrogen, and is also applicable to the treatment of wastewater of a high ratio of carbon to nitrogen. Also disclosed is a method for treating raw water containing an organic matter by using a multi-unit modified sequencing batch reactor.

Description

Multi-unit improved sequencing batch reactor and its application Technical field

The invention belongs to the technical field of sewage treatment. In particular, the invention relates to a multi-unit (especially 10 unit) modified batch batch reactor and its application in the treatment of sewage (especially sewage in southern China).

Background technique

The inventor pioneered an improved batch batch reactor 20 years ago, which covers functions including anorexia/anoxia, aerobic, sequencing batch reaction, precipitation of water, and the like, and is convenient for a single-box multi-processing chamber (abbreviated as Form integration of a pool of multiple chambers or a pool of multiple units (see Chinese patent ZL97196312.6). A typical one-chamber five-chamber modified sequential batch reactor includes an anaerobic reaction unit, a separation unit, a main aeration (aerobic) unit, and two sequential treatment (sequence) units at each half. During the operation cycle, one of the sequencing batch units precipitates water, and the other sequencing batch unit performs five-stage sewage recycling treatment with other units to remove phosphorus and nitrogen. However, the single-cased line of the reactor is complicated. To this end, the inventors have devised a six-chamber modified batch batch reactor comprising an anaerobic reaction unit, an anoxic reaction unit, a separation unit, a main aeration unit and two sequencing units. In one half of the operation cycle, one of the sequencing batches precipitates water, and the other sequencing batch unit performs a three-stage process of anoxic mixing, aerobic aeration and pre-precipitation.

The above improved batch batch reactor has been put into practical use in North America, and the operation effect is good, and the above-mentioned equipment structure has been basically maintained for many years. Their practical application in China is also earlier, but the inventors found that they operate well in the northern part of China, but the operation in the southern part of China is more difficult, and the quality of treated sewage is difficult to meet, even through in-depth adjustment Stage run parameters are sometimes not resolved smoothly.

To this end, the inventors have conducted arduous research, and have relied on decades of experience in the field to eliminate a large number of interference factors, such as the most easily affected temperature effects and the influence of environmental microorganisms, and finally found the most important problem. The cause is that the carbon to nitrogen ratio of sewage in southern China is lower. After finding out the crux, the inventors thoroughly examined the above-mentioned modified batch batch reactor, and specially designed the sewage treatment equipment for the sewage which has almost abandoned the equipment structure and additionally has a lower ratio of carbon to nitrogen ratio in the southern part of China. At that time, especially with the luck of some heavenly rewards, invented a (one pool) 10 unit modified batch batch reactor. The (one pool) 10 unit modified batch batch reactor greatly improves the phosphorus and nitrogen removal effect of the system by making full use of the raw water carbon source, especially the total nitrogen removal rate, and can be effectively eliminated without adding or adding too much agent. Solved the above problems. Moreover, the (single pool) 10 unit modified batch batch reactor has good water quality adaptability, can not only effectively treat sewage with lower ratio of carbon to nitrogen ratio, but also can be used as an 8-unit modified batch batch reactor. Efficiently replace the existing improved batch batch reactor to treat sewage with higher ratio of carbon to nitrogen ratio, providing an effective means for the country's latest sewage treatment standards; in addition, it can use the original one-cell multi-chamber equipment production line, saving upgrades cost.

Summary of the invention

The technical problem to be solved by the present invention is to provide a new improved batch batch reactor which is suitable for treating sewage with a low ratio of carbon to nitrogen ratio, and preferably has good water quality adaptability. Further, the present invention accordingly provides a method of treating raw water containing organic matter.

Specifically, in a first aspect of the invention, the present invention provides an improved sequential batch reactor comprising an anaerobic reaction unit (4), a first anoxic reaction unit (5), and a muddy water separation unit (2) The aerobic unit (6), the first sequencing batch unit (1) and the second sequencing batch unit (7) further comprising a pre-anoxic unit (3), a second anoxic reaction unit (5A), and a first deficiency / aerobic reaction unit (1A) and second aerobic reaction unit (7A); wherein, the anaerobic reaction unit (4) is capable of accepting raw water and accepting sediment from the pre-anoxic unit (3) And can cause the content liquid to react under anaerobic conditions;

a first anoxic reaction unit (5) capable of accepting a supernatant from the mud-water separation unit (2), capable of receiving a treatment liquid from the anaerobic reaction unit (4), and capable of causing the content liquid to be under anoxic conditions Carry out the reaction;

a second anoxic reaction unit (5A) capable of accepting a supernatant from the mud-water separation unit (2), capable of receiving a treatment liquid from the first anoxic reaction unit (5), and capable of causing the content liquid to be in anoxic Carry out the reaction under the conditions;

An aerobic unit (6) capable of accepting a supernatant from the mud-water separation unit (2), capable of receiving a treatment liquid from the second anoxic reaction unit (5A), and allowing the content liquid to be subjected to aeration conditions reaction;

a first deficient/aerobic reaction unit (1A) capable of receiving a treatment liquid which is divided by the anaerobic reaction unit (4), capable of receiving a treatment liquid from the aerobic unit (6), and capable of causing the content liquid to be in anoxic or Carrying out the reaction under aeration conditions;

a first sequencing batch unit (1) capable of accepting a supernatant from the mud water separation unit (2), capable of receiving a treatment liquid from the first aerobic/aerobic reaction unit (1A), and capable of making the content liquid Performing or precipitating water under oxygen or aeration or standing conditions;

a second aerobic/aerobic reaction unit (7A) capable of accepting a treatment liquid which is divided by the anaerobic reaction unit (4), capable of receiving a treatment liquid from the aerobic unit (6), and capable of causing the content liquid to be in anoxic or Carrying out the reaction under aeration conditions;

a second sequencing unit (7) capable of accepting a supernatant from the mud-water separation unit (2), capable of receiving a treatment liquid from the second aerobic/aerobic reaction unit (1A), and capable of making the content liquid Performing or precipitating water under oxygen or aeration or standing conditions;

A muddy water separation unit (2) capable of accepting treatment liquid and/or sedimented sediment from the first sequencing batch unit (1) and the second sequencing batch unit (7), and capable of receiving the bottom of the treatment liquid and/or the sedimentation liquid The supernatant and the sediment are separated from the mud; and, the pre-anoxic unit (3), which can accept the sediment from the mud-water separation unit (2), and allows the sediment to react under anoxic conditions.

Preferably, in the improved batch batch reactor of the first aspect of the invention, the anaerobic reaction unit (4), the first anoxic reaction unit (5), the first sequencing batch unit (1), and the second sequencing batch unit ( 7), the pre-oxygenation unit (3), the second anoxic reaction unit (5A), the first deficient/aerobic reaction unit (1A) and the second deficient/aerobic reaction unit (7A) are provided with a stirring device.

Preferably, in the improved batch batch reactor of the first aspect of the invention, the aerobic unit (6), the first sequencing batch unit (1), the second sequencing batch unit (7), and the first spent/aerobic reaction unit The aeration device is provided in the (1A) and the second deficient/aerobic reaction unit (7A).

Preferably, in the improved batch batch reactor of the first aspect of the invention, the first batch unit (1) and the second batch unit (7) have discharges discharged to the outside of the modified batch batch reactor. Device.

Preferably, in the improved batch batch reactor of the first aspect of the invention, one of the first batch unit (1) and the second batch unit (7) causes the content liquid to be in anoxic or aerated or allowed When the reaction is carried out under the conditions, the other is allowed to precipitate water. For example, one of the first sequencing batch unit (1) and the second sequencing batch unit (7) causes the content liquid to be sequentially reacted under anoxic, aerated, and standing conditions, and the other is to precipitate the content liquid. Water.

Preferably, in the improved batch batch reactor of the first aspect of the invention, the first spent/aerobic reaction unit (1A) and the second spent/aerobic reaction unit (7A) are subjected to accepting batch reactions from modified batches. A receiving device for the carbon source outside the device.

Preferably, in the improved batch batch reactor of the first aspect of the invention, the first anoxic reaction unit (5) is capable of accepting a treatment liquid from the aerobic unit (6).

Preferably, in the improved batch batch reactor of the first aspect of the invention, the first spent/aerobic reaction unit (1A) and the second spent/aerobic reaction unit (7A) are capable of causing the content liquid to be under anoxic conditions When the reaction is carried out, the content liquid can also be reacted under aeration conditions. It is also preferred that in the improved batch batch reactor of the first aspect of the invention, the first spent/aerobic reaction unit (1A) and the second spent/aerobic reaction unit (7A) are only capable of causing the content liquid to be in anoxic The reaction is carried out under the conditions.

Preferably, the improved batch batch reactor of the first aspect of the invention is a one-cell 10-unit structure.

Preferably, in the improved batch batch reactor of the first aspect of the invention, the anaerobic reaction unit (4), the first anoxic reaction unit (5), the second anoxic reaction unit (5A) and/or the aerobic unit (6) contains a filler.

In a second aspect of the invention, the invention provides a method of treating raw water containing organic matter, comprising:

(1) mixing the raw water with the sediment and performing the reaction under anaerobic conditions;

(2) reacting the treatment liquid obtained in the step (1) under anoxic conditions;

(3) reacting the treatment liquid obtained in the step (2) under anoxic conditions;

(4) reacting the treatment liquid obtained in the step (3) under aeration conditions;

(5) The treatment liquid obtained in the step (4) is optionally mixed with the treatment liquid obtained in the step (1), and then reacted under anoxic conditions;

(6) reacting the treatment liquid obtained in the step (5) under anoxic conditions;

(7) reacting the treatment liquid obtained in the step (6) under aeration conditions;

(8) The treatment liquid obtained in the step (7) is allowed to stand for precipitation; and,

(9) Precipitating the treatment liquid obtained in the step (8) out of the water,

Wherein, a part of the treatment liquid is taken in the step (6) and/or (7) and/or a partially precipitated sediment is taken in the step (8), and the supernatant and the sediment are separated, wherein the sediment is optionally boring The reaction is carried out in the step (1) after the reaction under oxygen.

Preferably, the process of the second aspect of the invention is carried out by the improved batch batch reactor of the first aspect of the invention, wherein one of the first batch unit (1) and the second batch unit (7) is subjected to the step (6) At the time of (7) and (8), the other step (9).

Preferably, in the method of the second aspect of the invention, the supernatant obtained by the separation is circulated to the treatment liquid of the steps (2), (3), (4), (6) and/or (7).

Detailed description of the invention

A first aspect of the invention provides an improved sequential batch reactor comprising an anaerobic reaction unit, a first anoxic reaction unit, a mud water separation unit, an aerobic unit, a first sequencing batch unit, a second sequencing batch unit, a pre-anoxic unit, a second anoxic reaction unit, a first deficient/aerobic reaction unit, and a second deficient/aerobic reaction unit.

In this context, an improved sequential batch reactor is also referred to as an improved sequential batch reactor comprising at least two sequencing batch units. In the first half of a typical operating cycle, the raw water flows through the anaerobic reaction unit, the first anoxic reaction unit, the aerobic unit, the first spent/aerobic reaction unit, and the first sequencing unit, and then flows into the mud-water separation. The unit is separated into a supernatant and a sediment, wherein the sediment is sent to the anaerobic reaction unit through the pre-anoxic unit, and the supernatant is directed to the first anoxic reaction unit, the second anoxic reaction unit, the aerobic unit or the sequence according to the water quality. Batch unit allocation, wherein the contents in the first sequencing batch unit are sequentially reacted under anoxic, aerated and standing conditions; meanwhile, the second sequencing unit performs precipitation of water. In the latter half of the operation cycle, the first absence/aerobic reaction unit, the first sequencing batch unit, the second absence/aerobic reaction unit, and the second sequencing batch unit in the above process are exchanged, and the above process is repeated by mirroring. . This operation cycle is cycled to process raw water without interruption. Of course, according to the water quality and treatment requirements, in the first (second) half of an operating cycle, the contents of the first (two) sequencing batch unit can also perform multiple stages of anoxic and aeration reactions, ie repeated in hypoxia and The reaction under aeration conditions is carried out 2 times, 3 times or more, and then the reaction is carried out under static conditions, such as under the conditions of hypoxia, aeration, anoxic, aeration and standing.

In this context, a unit refers to a chamber, pool (i.e., an open pool) or a tank that can perform the corresponding functions independently. For example, hypoxia (reaction) refers to not contacting additional air other than the atmosphere, such as no aeration, so that the content of the unit cell is subjected to anoxic reaction, including facultative bacteria (eg, denitrifying bacteria). The denitrification reaction of nitrate, and the reaction of phosphorus-rich bacteria (such as Acinetobacter and Aeromonas) to absorb fatty acids and release phosphate. The anoxic (reaction) unit may be a tank that does not have an aeration function, preferably a substantially closed chamber or tank. The anaerobic reaction unit can have substantially the same structure as the anoxic reaction unit, except that it has the function of not contacting the additional air other than the atmosphere (for example, without aeration), and avoiding the nitrate-containing to the utmost extent. The inflow of the treatment liquid. As another example, an aerobic (reaction) unit is a chamber, tank, or tank that has the function of introducing additional air or oxygen (usually having an aeration function), thereby allowing the content liquid to undergo an aerobic reaction therein, including nitrifying bacteria (eg, Nitrification of nitroxanubicin and nitrobacteria, and a greater amount of absorption of phosphate by phosphorus-rich bacteria.

Microorganisms involved in hypoxia and aerobic reactions are usually present in the slurry of sewage and gradually increase and stabilize with the maintenance of anoxic and aerobic environments, sufficient to complete the hypoxia and aerobic reactions of the corresponding units, generally without the need for additional microbes. . In this context, the exemplary operation of the modified batch batch reactor refers to the operation of the microbial stable reaction, rather than the extreme case of microbial deficiency at the initial stage of equipment input.

Herein, the muddy water separation unit is also referred to as a separation unit, and the sediment and the supernatant are usually separated by gravity, and the sediment can be transported to the pre-anoxic unit through the pipeline, but in the present invention, the mud-water separation unit and the pre-deficient are preferred. The oxygen units are adjacent and have a common slab wall that communicates at the bottom of the common slab wall, preferably the bottom portion is inclined by the mud water separation unit to the pre-anoxic unit so that the sediment in the mud-water separation unit is deposited into the pre-anoxic unit. Preferably, the mud-water separation unit is disposed at a higher position, and the top height is higher than the other units, so that the pipeline extending from the top or higher than the upper portion of the other unit can directly distribute the supernatant by using the height difference without a pump; and other units The height can be flush.

As used herein, a sequencing batch unit refers to a chamber, tank or tank that can perform different reactions (eg, anoxic reaction and aerobic reaction) at different time periods, preferably a substantially closed chamber or tank. And with an aeration device therein, an aerobic reaction is performed during aeration, and an anoxic reaction is performed when aeration is stopped. The spent/aerobic reaction unit is preferably a substantially closed chamber, tank or tank substantially similar to the sequencing unit and has an aeration device therein, but may also be capable of performing only anoxic (reaction) units and aerobic (reaction) A single-function unit of one of the units. For example, the aerobic/aerobic reaction unit is only an anoxic (reaction) unit, which does not have an aeration function, and is also sufficient for effective treatment of sewage having a low carbon to nitrogen ratio; for example, a lack/aerobic reaction unit It is only an aerobic (reaction) unit, which can be regarded as the derivation or expansion of aerobic units. Theoretically equivalent to operating in an 8-unit modified batch batch reactor, but in practice it can be replaced more efficiently. The existing one-cell six-chamber modified batch batch reactor is sufficient for effective treatment of sewage with high carbon to nitrogen ratio.

In the present invention, the receiving liquid or slurry can be achieved through a line or nozzle. Among them, the pipeline is usually used for the transportation between two separate units, and the nozzle is used for the transportation between two units adjacent to each other (ie, the common wall). Valves can be placed on both the line and the nozzle to control opening and closing and flow. Pumps can be placed on the pipeline to lift liquid or mud, or to increase the speed of delivery. The pump may preferably be of adjustable power, such as with a frequency converter, to regulate the flow.

In this context, raw water refers to sewage containing organic matter (eg, urban domestic sewage) in a narrow sense, that is, sewage that is initially clarified or filtered to avoid extremely high mixed suspended solids concentration (MLSS). The typical concentration of MLSS in raw water is from 2,000 to 4,500 mg/L, preferably from 2,500 to 3,500 mg/L, more preferably from 3,000 to 4,000 mg/L. Thus, in addition to the pre-oxygenation unit and the mud-water separation unit, the typical concentration of the treatment liquid in each unit of the improved batch batch reactor of the present invention is usually also from 2,000 to 4,500 mg/L, preferably from 2,500 to 3,500 mg/L. More preferably, it is 3000-4000 mg / L.

Herein, the first and second are merely units that distinguish the structures or functions that are the same or similar, and are not intended to define the structure or function of the respective units themselves. For example, in the present invention, two anoxic reaction units, that is, a first anoxic reaction unit and a second anoxic reaction unit are disposed in series, and they may have the same structure, and are all functions for performing an anoxic reaction of the content liquid thereof. . The present inventors have found that for a sewage having a low carbon to nitrogen ratio, it is necessary to provide two anoxic reaction units in series after the anaerobic reaction unit in the modified batch batch reactor, and the raw water is only anaerobic. The excess organic carbon remaining in the reaction unit is denitrified in the first anoxic reaction unit with the concentrated and/or refluxed supernatant and/or treatment liquid containing the high concentration of nitrate, and the reaction can be maintained at a higher rate. After that, relatively little accepted organic carbon and the sub-high concentration of nitrate received and/or distributed are denitrified in the second anoxic reaction unit, and the reaction rate is correspondingly low, so the two anoxic reaction units connected in series can not only Slow down the short-flow phenomenon in the reaction tank, and make full use of the limited organic carbon source in the raw water, reduce its oxidative degradation to the aerobic unit, and improve the efficiency of the denitrification reaction.

Preferably, in the improved batch batch reactor of the first aspect of the invention, the first anoxic reaction unit is capable of accepting a treatment liquid from the aerobic unit. In this way, there is enough nitrate to reflux and maintain a long reaction residence time, in order to avoid the low nitrate caused by the phosphorus-free bacteria in the pre-anoxic pool without adsorption release affecting the phosphorus removal effect.

Although the anaerobic/anoxic reaction can be carried out in a standing state, in the present invention, the unit capable of performing the anaerobic/anoxic reaction function is preferably provided with a stirring device, thereby improving the corresponding reaction efficiency. For example, an anaerobic reaction unit, a first anoxic reaction unit, a first sequencing batch unit, a second sequencing batch unit, a pre-anoxic unit, a second anoxic reaction unit, a first deficiency/aerobic reaction unit, and a second deficiency / Aerobic reaction unit with a stirring device. In addition, a unit capable of performing an aerobic reaction function, such as an aerobic unit, a first sequencing batch unit, a second sequencing batch unit, a first absence/aerobic reaction unit, and a second absence/aerobic reaction unit, with aeration Device.

The sequencing unit has a discharge device that discharges the sludge to the outside of the modified batch batch reactor, such as a line or nozzle with a sludge pump to avoid excessive sediment deposition. When the water is precipitated, the batch unit may be provided with a water purifier for discharging water, but it is preferable to provide an air outlet water for discharging water. For example, a baffle is arranged at the bottom of the sequencing unit, so that when the water is precipitated, the water is filtered through the sediment. The clarification is then carried out through the air effluent from the upper part to further improve the water quality. When a sequencing batch unit performs precipitation of water, another sequencing batch unit is sequentially reacted under anoxic, aerated and static conditions, wherein the anoxic reaction is carried out without opening the stirring device without opening the aeration device. The aeration reaction is carried out with the aeration device turned on, and the static reaction is carried out with the agitation device and the aeration device turned off. The mud-water separation unit is connected by a pipeline batch unit with a pump, preferably in communication with the bottom or lower portion of the sequencing batch unit, for receiving the treatment liquid and/or the precipitated sediment from the sequencing batch unit. Usually, in the absence of oxygen and aeration, the treatment liquid is accepted, and when it is allowed to stand, it is a precipitated sediment which is much higher in mud content than the treatment liquid in order to recover the microorganisms therein.

In order to guard against sewage having a low carbon to nitrogen ratio, the improved batch batch reactor of the first aspect of the invention may also be provided with an additional carbon source receiving device. Although the inventors believe that any unit capable of performing the anaerobic/anoxic reaction function can accept an additional carbon source, the inventors have found that it has been found to be more beneficial to be placed on the spent/aerobic reaction unit.

In the present invention, a filler may be included in each unit to facilitate the growth of microorganisms on it. The filler may be irregularly shaped, spherical or cubic. Usually, the filler is made of sponge or polyurethane. Preferably, the filler is a porous filler suitable for the growth of microorganisms attached to surfaces and at various depths inside. Although each unit may contain a filler, the inventors have found that it is particularly advantageous to include a filler in the anaerobic reaction unit, the first anoxic reaction unit, the second anoxic reaction unit, and the aerobic unit, especially at low water temperatures. Time (such as in the winter of the Yangtze River in China), especially to help maintain the high efficiency of biological treatment, while the addition of fillers in other units is the opposite of the advantages and disadvantages, so other units may not contain fillers. Preferably, in the present invention, the anaerobic reaction unit, the first anoxic reaction unit, the second anoxic reaction unit, and/or the aerobic unit contain a filler. More preferably, the diameter or the longest side length of the packing is greater than the pore size of the screen on the line or nozzle that communicates with the respective unit for stable retention within the respective unit.

The improved batch batch reactor of the first aspect of the invention is preferably an integrated single tank, such as a pool of 10 unit structures. The preferred distribution structure of each unit is shown in FIG. Preferably, one end of the single tank is divided into three columns, wherein the middle includes a pre-anoxic unit, a mud-water separation unit, an anaerobic reaction unit, a first anoxic reaction unit and a second anoxic reaction unit; the middle side includes a first sequencing batch unit and a first missing/aerobic reaction unit; and the other side includes a second sequencing batch unit and a second missing/aerobic reaction unit in sequence; the other end is provided with an aerobic unit, which is the first missing/good The oxygen reaction unit, the second anoxic reaction unit and the second absence/aerobic reaction unit are adjacent. Adjacent units are preferably in close proximity, such as a common slab wall, and if required to communicate, adjacent units may be connected by a nozzle on the common slab.

Since the raw water/treatment liquid can be used to compensate for the lack of volume in the reaction and residence time of a certain unit, there has been little research on the volume of each unit in the prior art. The present inventors have found that for sewage in southern China, especially sewage having a relatively low carbon to nitrogen ratio, the pre-oxygen unit, the mud-water separation unit, and the anaerobic reaction in the improved batch batch reactor of the first aspect of the invention are preferred. Unit, first anoxic reaction unit, second anoxic reaction unit, aerobic unit, first sequencing unit, first absence/aerobic reaction unit 1A, second sequencing unit, and second absence/aerobic reaction unit The volume is small, small, medium, medium, medium, maximum, large, medium, large and medium, and such volume ratio can maximize the efficient biological treatment. For the sake of clarity, the quantitative pre-anoxic unit, the mud-water separation unit, the anaerobic reaction unit, the first anoxic reaction unit, the second anoxic reaction unit, the aerobic unit, the first sequencing unit, the first deficiency/aerobic The volume ratio of the reaction unit 1A, the second sequencing unit and the second spent/aerobic reaction unit may be 0.2 to 0.8: 0.2 to 0.8: 0.5 to 1.5: 0.5 to 1.5: 0.5 to 1.5: 2 to 8: 1.5 to 4.5. : 0.5 to 1.5: 1.5 to 4.5: 0.5 to 1.5, preferably 0.3 to 0.7: 0.3 to 0.7: 0.8 to 1.2: 0.8 to 1.2: 0.8 to 1.2: 3 to 7: 2.5 to 3.5: 0.8 to 1.2: 2.5 to 3.5 : 0.8 to 1.2, more preferably 0.4 to 0.6: 0.4 to 0.6: 0.9 to 1.1: 0.9 to 1.1: 0.9 to 1.1: 4 to 6: 2.8 to 3.2: 0.9 to 1.1: 2.8 to 3.2: 0.9 to 1.1.

A second aspect of the invention provides a process for treating raw water containing organic matter, preferably by an improved batch batch reactor of the first aspect of the invention.

The method of the second aspect of the invention comprises:

(1) mixing the raw water with the sediment and performing the reaction under anaerobic conditions, preferably the step is carried out in an anaerobic reaction unit;

(2) reacting the treatment liquid obtained in the step (1) under anoxic conditions, preferably the step is carried out in the first anoxic reaction unit;

(3) reacting the treatment liquid obtained in the step (2) under anoxic conditions, preferably the step is carried out in the second anoxic reaction unit;

(4) reacting the treatment liquid obtained in the step (3) under aeration conditions, preferably the step is carried out in an aerobic unit;

(5) The treatment liquid obtained in the step (4) is optionally mixed with the treatment liquid obtained in the step (1), and then reacted under anoxic conditions, preferably in the absence/aerobic reaction unit (especially the first In the absence/aerobic reaction unit);

(6) reacting the treatment liquid obtained in the step (5) under anoxic conditions, preferably in the sequencing batch unit (especially the first sequencing batch unit);

(7) reacting the treatment liquid obtained in the step (6) under aeration conditions, preferably the step is carried out in a sequencing batch unit (especially the first sequential batch unit);

(8) The treatment liquid obtained in the step (7) is allowed to stand for precipitation, preferably the step is carried out in the sequencing batch unit (especially the first sequencing batch unit);

(9) precipitating the treatment liquid obtained in the step (8) out of water, preferably the step is carried out in a sequencing batch unit (especially a second sequencing batch unit),

Wherein a portion of the treatment liquid is taken in steps (6) and/or (7) and/or a partially precipitated sediment is taken in step (8), preferably in a mud-water separation unit, to obtain a supernatant and a sediment. Wherein the bottom sludge is optionally recycled to the step (1) after the reaction is carried out under anaerobic conditions (preferably in a pre-oxane unit).

In this context, optionally with its dictionary meaning, refers to the relationship of choice and non-selection. For example, in the step (5), the treatment liquid obtained in the step (4) is directly reacted under anoxic conditions without being mixed with the treatment liquid obtained in the step (1) (the treatment liquid obtained in the step (1) is not accepted). Alternatively, the treatment liquid obtained in the step (4) (receiving the treatment liquid obtained in the step (1)) is mixed with the treatment liquid obtained in the step (1), and then the reaction is carried out under anoxic conditions. For another example, after separating the supernatant and the sediment, the sediment is directly circulated for use in the step (1) (without performing the anaerobic reaction), or the bottom sludge is subjected to the reaction under anaerobic conditions and then recycled for the step. (1) Medium.

The first deficit/aerobic reaction unit, the first sequencing batch unit and the second spent/aerobic reaction unit, and the second sequencing batch unit can exchange the steps performed thereby, thereby performing a loop process. In any one cycle of the cycle, when one of the first and second sequencing units performs steps (6), (7), and (8), the other proceeds to step (9).

If the supernatant obtained by the separation is qualified, it may be added to the treatment liquid of the step (9) to precipitate the water, and in most cases, it may be further processed, including the step of adding to the steps (2), (3), (4), 6) and / or (7) in the treatment liquid.

In the present invention, it is also preferred to carry out the reaction in the step (4) by taking a part of the treatment liquid and adding it to the treatment liquid of the step (2) under anoxic conditions. After this occurs, in the step (5), in the case where an additional carbon source is added, the treatment liquid obtained in the step (4) is optionally subjected to an reaction under anoxic conditions after being mixed with the raw water.

The invention has the beneficial effects that the improved batch batch reactor of the invention can remove phosphorus and nitrogen from sewage, in particular, can increase the total nitrogen removal rate by about 25% relative to the existing modified batch batch reactor. Fully utilizing raw water carbon source, especially suitable for treating sewage with relatively low carbon and nitrogen, effectively reducing the cost of additional carbon source chemicals in operation; Moreover, the improved batch batch reactor of the present invention has sufficient flexibility and can also be fully It can replace the function of the existing improved batch batch reactor, and can extend the original production line, materials and components, and is easy to upgrade.

For ease of understanding, the present invention will be described in detail below through the specific drawings and embodiments. It is to be understood that the description is not intended to be limiting Many variations and modifications of the invention will be apparent to those skilled in the <RTIgt; In addition, the present invention is hereby incorporated by reference in its entirety in its entirety in its entirety in its entirety in its entirety in its entirety in the the the the the the the

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a view showing the arrangement and connection of the units in the 10-unit modified batch batch reactor of the present invention, wherein the arrows point to the flow direction of the raw water, the treatment liquid or the sediment; wherein Figs. 1A and 1B respectively show simultaneous operation. The flow direction of two sequential batch units, where the completely closed pipeline is omitted.

Figure 2 shows the distribution of the units of the 10-unit modified batch batch reactor of the present invention in an integrated structure of a single tank (one tank).

detailed description

The following description will be made with specific examples in which materials and components are commercially available.

Example 1 10-unit modified sequential batch batch reactor in single tank form

The distributed structure of the integrated single-casing of the 10-unit modified batch batch reactor of the present invention is shown in FIG. 2, wherein each unit is a chamber structure, and the pipeline and nozzle connection forms are as shown in FIG. Shown.

The middle of the single tank includes a pre-oxygen unit 3, a mud-water separation unit 2, an anaerobic reaction unit 4, a first anoxic reaction unit 5, and a second anoxic reaction unit 5A, wherein the bottom of the mud-water separation unit 2 is pre-deficient The oxygen unit 3 is inclined and connected so that the sediment in the mud water separation unit 2 is deposited to the pre-anoxic unit 3; the anaerobic reaction unit 4 is connected to an external line capable of passing into the raw water, the anaerobic reaction unit 4 and the first anoxic reaction unit 5 communicating through a nozzle on a common slab; the first anoxic reaction unit 5 and the second anoxic reaction unit 5A are communicated through a nozzle on a common slab; the muddy water separation unit 2 and the anaerobic reaction unit 4 are shared a wall, but not connected; the pre-oxygen unit 3 is connected to the anaerobic reaction unit 4 through a line with a sludge pump to transport the sediment in the pre-anoxic unit 3 to the anaerobic reaction unit 4; The oxygen unit 3, the anaerobic reaction unit 4, the first anoxic reaction unit 5, and the second anoxic reaction unit 5A are not disposed in an open form, and are each provided with a stirring device in order to sufficiently mix the content liquid thereof to facilitate Anaerobic or anoxic reactions.

The single tank side includes a first sequencing batch unit 1 and a first spent/aerobic reaction unit 1A in sequence, wherein the first sequencing batch unit 1 and the first spent/aerobic reaction unit 1A pass through a tube on a common wall The first batch unit 1 is provided with an air outlet port, and the outlet of the air outlet port is provided with a line communicating with the outside of the single box body to discharge the treated water, and the sludge pump is also passed through The line is connected to the outside of the single tank to be discharged when the sediment is excessively deposited; the first spent/aerobic reaction unit 1A is connected to the external line on the anaerobic reaction unit 4 or its vicinity by a line optionally having a pump In order to receive the split raw water; the first deficient/aerobic reaction unit 1A also has an openable and closed skylight, in addition to facilitating observation of the sampling, it is also possible to input a carbon source or the like into it when necessary; the first sequencing unit 1 And the first lack/aerobic reaction unit 1A is not disposed in an open form, and each of them is provided with a stirring device and an aeration device, so that the following operation can be performed: the agitation reaction is started without activating the agitation device State, open aeration The aerobic reaction state is set, the static reaction or the precipitation state of the agitation device and the aeration device is turned off; for the raw water having a lower carbon to nitrogen ratio, the first deficient/aerobic reaction unit 1A only needs to maintain the anoxic reaction. The state (and the ability to provide the corresponding structure and components) can be.

The other side of the single tank symmetrically includes a second sequencing batch unit 7 and a second aerobic/oxygen reaction unit 7A, respectively, having a structure corresponding to the first sequencing batch unit 1 and the first missing/aerobic reaction unit 1A, respectively. the same.

The aerobic unit 6 sharing the slab with the first vacancy/aerobic reaction unit 1A, the second anoxic reaction unit 5A and the second anoxia/oxygen reaction unit 7A passes through the nozzles on the common slab wall and the first deficiencies respectively / aerobic reaction unit 1A, second anoxic reaction unit 5A and second aerobic reaction unit 7A are connected; aerobic unit 6 is preferably connected to the first anoxic reaction unit 5 through a pipeline with a pump (not shown) Shown) to transport the treated water having a higher nitrate content in the aerobic unit 6 to the first anoxic reaction unit 5 (and further into the second anoxic reaction unit 5A) to provide nitrate for the anoxic unit for denitrification At the same time, it promotes the phosphorus adsorption of polyphosphate bacteria in the anoxic unit, which is beneficial for the phosphorus removal of sewage with higher phosphorus content.

The aerobic unit 6 and the muddy water separation unit 2 may be provided in an open form, but are preferably not provided in an open form; the muddy water separation unit 2 passes through a line with a pump and a first sequencing batch unit 1 and a second sequencing batch unit 7, respectively. Connected, preferably in communication with the bottom or lower portion of the first and second sequencing units 1 and 7, for receiving the treatment liquid and/or the bottom of the first batch unit 1 and the second batch unit 7 respectively The mud, the treatment liquid and the sedimented sediment are separated into the sediment and the supernatant by gravity in the mud water separation unit 2; the top of the mud water separation unit 2 is higher than the other units, and the mud water separation unit 2 passes through the pipeline respectively (preferably from the top thereof or The upper extended pipeline, so that there may be no pump but with a valve) respectively with the first anoxic reaction unit 5, the second anoxic reaction unit 5A, the aerobic unit 6, the first sequencing batch unit 1 and the second sequencing batch Unit 7 to transport the supernatant to the corresponding unit, wherein if the water quality of the supernatant has passed, it is transported to the sequencing unit that is precipitating the water; the nitrate content is extremely high (eg NOx>15 mg/L), then Transported to the first anoxic reaction unit 5 If the nitrate content is too high (eg 15mg/L>NOx>10mg/L), then transport to the second anoxic reaction unit 5A; the nitrate content is too low and the ammonia nitrogen or carbon source content is high (eg NH4>10mg/L) ), then transported to the aerobic unit 6; and most of the rest are transported to the sequencing unit that is undergoing the reaction under anoxic or aerated or standing conditions.

Pre-oxygenation unit 3, mud water separation unit 2, anaerobic reaction unit 4, first anoxic reaction unit 5, second anoxic reaction unit 5A, aerobic unit 6, first sequencing unit 1, first lack/good The approximate volume ratio of the oxygen reaction unit 1A, the second sequencing unit 7 and the second absence/aerobic reaction unit 7A is 0.5:0.5:1:1:1:5:3:1:3:1.

In winter, a porous filler may be added to the anaerobic reaction unit, the first anoxic reaction unit, the second anoxic reaction unit, and the aerobic unit.

Valves can be set for each line and nozzle to control opening and closing and flow; each pump (such as sludge pump) can be adjustable in power, such as with a frequency converter to regulate flow; each unit can be set On-line monitors (eg, redox potentiometers), detecting nitrate concentrations, etc., especially by various pumps and/or valves, especially controlling the nitrate nitrogen in the pre-anoxic unit 3 at 0.5-1.5 mg/L.

Example 2 Typical Application Example (Case A)

As an example, the single box structure of the embodiment 1 has a length of 65.3 meters, a width of 48.8 meters, a height of 6m/8m meters, a daily (24 hours) flow rate (handling amount) of 25000 m3, and carbon in the Jiangsu region from December to January. The wastewater has a nitrogen ratio of about 50% lower than that of the typical China (North) region (the BOD5/TN is 2.1, which is treated in the prior art modified batch batch reactor, and an additional carbon source must be used to qualify the effluent water quality) A cycle operation of time allocation as shown in Table 1 was carried out, during which no carbon source agent was charged.

Table 1 Runtime allocation of sequential batch units in the operation cycle

The water quality of the sewage before and after the above treatment is shown in Table 2. The results show that the 10-unit modified batch batch reactor of the present invention can effectively treat sewage with low carbon to nitrogen ratio, and is currently an ideal sewage biological phosphorus and nitrogen removal equipment. .

Table 2 Water quality before and after treatment

index Injected sewage (mg/L) Effluent (mg/L) BOD5 83 4 TSS 122 5 Ammonia nitrogen 32.87 0.46 Nitrate 0 7.3 Nitrite 0 0.1 TN 39.58 7.98

TP 3.1 0.127 Phosphate 2.8 0.11

Example 3 Typical Application Example (Case B)

As an example, the single-box structure of the embodiment 1 has a length of 88.3 meters, a width of 66.6 meters, a height of 8 m/9 m meters, a daily (24 hours) flow rate (handling amount) of 62,500 m ³ , and a carbon nitrogen in January in Hunan. It is about 25% lower than the sewage in typical China (North) region (including BOD5/TN of 2.88, which is treated in the prior art modified batch batch reactor, and additional carbon source must be put in order to qualify the effluent quality) The cycle of time allocation as shown in Table 1 does not involve any carbon source reagents.

Table 1 Runtime allocation of sequential batch units in the operation cycle

The water quality of the sewage before and after the above treatment is shown in Table 2. The results show that the 10-unit modified batch batch reactor of the present invention can effectively treat sewage with low carbon to nitrogen ratio, and is currently an ideal sewage biological phosphorus and nitrogen removal equipment. .

Table 2 Water quality before and after treatment

index Injected sewage (mg/L) Effluent (mg/L) BOD5 130 0.21 TSS 350 5 Ammonia nitrogen 35 1.56 Nitrate 0 6.75 Nitrite 0 0 TN 45 7.98 TP 4.0 0.4 Phosphate 3.9 0.1

Claims (10)

An improved sequential batch reactor comprising an anaerobic reaction unit (4), a first anoxic reaction unit (5), a mud water separation unit (2), an aerobic unit (6), a first sequencing batch unit (1), and a second sequencing batch unit (7); the modified sequential batch reactor further comprises a pre-anoxic unit (3), a second anoxic reaction unit (5A), a first deficient/aerobic reaction unit (1A), and a second deficiency/aerobic reaction unit (7A), wherein An anaerobic reaction unit (4) capable of accepting raw water, capable of accepting sediment from the pre-anoxic unit (3), and allowing the content liquid to react under anaerobic conditions; a first anoxic reaction unit (5) capable of accepting a supernatant from the mud-water separation unit (2), capable of receiving a treatment liquid from the anaerobic reaction unit (4), and capable of causing the content liquid to be under anoxic conditions Carry out the reaction; a second anoxic reaction unit (5A) capable of accepting a supernatant from the mud-water separation unit (2), capable of receiving a treatment liquid from the first anoxic reaction unit (5), and capable of causing the content liquid to be in anoxic Carry out the reaction under the conditions; An aerobic unit (6) capable of accepting a supernatant from the mud-water separation unit (2), capable of receiving a treatment liquid from the second anoxic reaction unit (5A), and allowing the content liquid to be subjected to aeration conditions reaction; a first deficient/aerobic reaction unit (1A) capable of receiving a treatment liquid which is divided by the anaerobic reaction unit (4), capable of receiving a treatment liquid from the aerobic unit (6), and capable of causing the content liquid to be in anoxic or The reaction is carried out under aeration conditions, and the first spent/aerobic reaction unit (1A) is connected to the external line on the anaerobic reaction unit (4) or its vicinity through a line with a pump to receive the split raw water; a first sequencing batch unit (1) capable of accepting a supernatant from the mud water separation unit (2), capable of receiving a treatment liquid from the first aerobic/aerobic reaction unit (1A), and capable of making the content liquid Performing or precipitating water under oxygen or aeration or standing conditions; a second aerobic/aerobic reaction unit (7A) capable of accepting a treatment liquid which is divided by the anaerobic reaction unit (4), capable of receiving a treatment liquid from the aerobic unit (6), and capable of causing the content liquid to be in anoxic or The reaction is carried out under aeration conditions, and the second spent/aerobic reaction unit (7A) is connected to the external line on the anaerobic reaction unit (4) or its vicinity through a line with a pump to receive the split raw water; a second sequencing unit (7) capable of accepting a supernatant from the mud-water separation unit (2), capable of receiving a treatment liquid from the second aerobic/aerobic reaction unit (1A), and capable of making the content liquid Performing or precipitating water under oxygen or aeration or standing conditions; A muddy water separation unit (2) capable of accepting treatment liquid and/or sedimented sediment from the first sequencing batch unit (1) and the second sequencing batch unit (7), and capable of receiving the bottom of the treatment liquid and/or the sedimentation liquid The supernatant and the sediment are separated from the mud, and the top of the mud-water separation unit (2) is higher than the other units, and the mud-water separation unit (2) is respectively reacted with the first anoxic reaction unit (5) and the second anoxic reaction respectively through the pipeline. The unit (5A), the aerobic unit (6), the first sequencing batch unit (1) and the second sequencing batch unit (7) are connected to transport the supernatant to the corresponding unit; a pre-oxygenation unit (3) capable of accepting sediment from the mud-water separation unit (2) and allowing the sediment to react under anoxic conditions, Among them, the pre-anoxic unit (3), the mud-water separation unit (2), the anaerobic reaction unit (4), the first anoxic reaction unit (5), the second anoxic reaction unit (5A), and the aerobic unit (6) The volume ratio of the first sequencing batch unit (1), the first spent/aerobic reaction unit (1A), the second sequencing batch unit (7), and the second spent/aerobic reaction unit (7A) is 0.2 to 0.8. : 0.2 to 0.8: 0.5 to 1.5: 0.5 to 1.5: 0.5 to 1.5: 2 to 8: 1.5 to 4.5: 0.5 to 1.5: 1.5 to 4.5: 0.5 to 1.5. The improved batch batch reactor of claim 1 wherein Anaerobic reaction unit (4), first anoxic reaction unit (5), first sequencing batch unit (1), second sequencing batch unit (7), pre-anoxic unit (3), second anoxic reaction unit (5A), the first deficient/aerobic reaction unit (1A) and the second deficient/aerobic reaction unit (7A) are provided with a stirring device; Aerobic unit (6), first sequencing batch unit (1), second sequencing batch unit (7), first absence/aerobic reaction unit (1A) and second absence/aerobic reaction unit (7A) Have aeration device; The first sequencing batch unit (1) and the second sequencing batch unit (7) are provided with a discharge device for discharging sludge to the outside of the modified batch batch reactor; and/or, The anaerobic reaction unit (4), the first anoxic reaction unit (5), the second anoxic reaction unit (5A), and/or the aerobic unit (6) contain a filler. The improved batch batch reactor of claim 1 wherein one of the first batch unit (1) and the second batch unit (7) causes the contents to be in anoxic or aerated or static When the reaction was carried out under conditions, the other was allowed to precipitate water. The improved batch batch reactor of claim 1 wherein the first spent/aerobic reaction unit (1A) and the second spent/aerobic reaction unit (7A) are subjected to acceptance from an improved batch batch batch A receiving device for the carbon source outside the reactor. The improved batch batch reactor of claim 1 wherein the first anoxic reaction unit (5) is capable of accepting a treatment fluid from the aerobic unit (6). The improved batch batch reactor of claim 1 wherein the first spent/aerobic reaction unit (1A) and the second spent/aerobic reaction unit (7A) are capable of causing the content liquid to be in anoxic conditions The reaction is carried out under the same conditions, and the content liquid can be reacted under aeration conditions. The improved batch batch reactor according to claim 1, characterized in that the pre-oxygen unit (3), the mud-water separation unit (2), the anaerobic reaction unit (4), and the first anoxic reaction unit (5) a second anoxic reaction unit (5A), an aerobic unit (6), a first sequencing unit (1), a first absence/aerobic reaction unit (1A), a second sequencing unit (7), and a second The volume ratio of the deficient/aerobic reaction unit (7A) is 0.3 to 0.7: 0.3 to 0.7: 0.8 to 1.2: 0.8 to 1.2: 0.8 to 1.2: 3 to 7: 2.5 to 3.5: 0.8 to 1.2: 2.5 to 3.5: 0.8 ~1.2. The improved batch batch reactor according to claim 7, characterized in that the pre-oxygenation unit (3), the mud-water separation unit (2), the anaerobic reaction unit (4), and the first anoxic reaction unit (5) a second anoxic reaction unit (5A), an aerobic unit (6), a first sequencing unit (1), a first absence/aerobic reaction unit (1A), a second sequencing unit (7), and a second The volume ratio of the deficient/aerobic reaction unit (7A) is 0.4 to 0.6: 0.4 to 0.6: 0.9 to 1.1: 0.9 to 1.1: 0.9 to 1.1: 4 to 6: 2.8 to 3.2: 0.9 to 1.1: 2.8 to 3.2: 0.9 ~1.1. The improved batch batch reactor of any of claims 1-8, characterized in that it is a cell 10 unit structure. A method of treating raw water containing organic matter by the improved batch batch reactor of any one of claims 1-9, comprising: (1) mixing the raw water with the sediment and performing the reaction under anaerobic conditions, and the step is carried out in an anaerobic reaction unit; (2) reacting the treatment liquid obtained in the step (1) under anoxic conditions, the step being carried out in the first anoxic reaction unit; (3) reacting the treatment liquid obtained in the step (2) under anoxic conditions, the step being carried out in the second anoxic reaction unit; (4) reacting the treatment liquid obtained in the step (3) under aeration conditions, the step being carried out in an aerobic unit; (5) after the treatment liquid obtained in the step (4) is mixed with the treatment liquid obtained in the step (1), the reaction is carried out under anoxic conditions, and the step is carried out in the first deficient/aerobic reaction unit; (6) reacting the treatment liquid obtained in the step (5) under anoxic conditions, the step being carried out in the first batch unit; (7) reacting the treatment liquid obtained in the step (6) under aeration conditions, the step being carried out in the first batch unit; (8) The treatment liquid obtained in the step (7) is allowed to stand for precipitation, and the step is carried out in the first sequencing unit; (9) Precipitating the treatment liquid obtained in the step (8) out of water, and the step is carried out in the second sequencing unit. Wherein, a part of the treatment liquid is taken in the step (6) and/or (7) and a partially precipitated sediment is taken in the step (8), and the supernatant and the sediment are separated, wherein the sediment is subjected to anaerobic conditions. The post-reaction cycle is used in the step (1), and the supernatant obtained by the separation is circulated to the treatment liquids of the steps (2), (3), (4), (6) and (7).

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