CN116803926A - A miniaturized fully quantified mobile treatment device and method for leachate in village garbage transfer stations - Google Patents
A miniaturized fully quantified mobile treatment device and method for leachate in village garbage transfer stations Download PDFInfo
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Abstract
The invention discloses a device and a method for fully quantitatively treating percolate of a small village and town garbage transfer station, which solve the technical problems of large occupied area, secondary pollution and the like in the prior art. The treatment method sequentially comprises an adjusting unit, an ABR pretreatment unit, a MAP unit, a three-dimensional electro-catalytic unit and a water outlet unit. The ABR reactor can effectively improve the sludge load, the MAP unit can realize the resource utilization, the electrocatalytic unit adopts or partially adopts the boron-doped diamond electrode, the electrolysis efficiency is extremely high, the particle electrode is added to improve the treatment efficiency, and the operation investment is reduced. The technology not only fully utilizes a biochemical method and an advanced oxidation technology, but also can be used for manufacturing the ABR unit, the MAP unit and the electrocatalytic technology unit into skid-mounted garbage transfer station percolate treatment equipment, can serve a plurality of stations, is simple to operate, has strong applicability and flexible application, solves the problem of reverse osmosis concentrated water, has the advantages of recycling, full quantization, low running cost and the like, and is particularly suitable for small garbage transfer stations in villages and towns.
Description
Technical Field
The invention relates to the technical field of landfill leachate treatment, in particular to a full-quantization mobile treatment device and method for leachate of a small village and town landfill transfer station.
Background
At present, the village and town garbage disposal in China mainly adopts a mode of household classification, village collection, town transportation and county disposal, and in order to reduce the garbage volume and the water content, improve the transportation efficiency and prevent secondary pollution, the garbage is stopped and compressed in a transfer station, and percolate is generated in the process. However, the part of the landfill leachate has small water quantity, complex components, large pollutant concentration change and toxic and harmful substances, but the traditional water treatment mode is only suitable for the treatment of landfill leachate of towns and garbage power plants due to large investment of treatment facilities and high operation cost, and has no proper treatment technology and device for the landfill leachate of villages and towns, so that most of villages and towns do not treat the leachate and are directly sent to sewage treatment plants. Therefore, the technical research in the aspect is enhanced, and the method has important significance for the treatment of the leachate of the small garbage transfer station.
The prior garbage leachate treatment technology comprises a plurality of methods and equipment, the most common is biochemical treatment and membrane treatment, and some patent technologies, such as a container type garbage transfer station leachate treatment system and a using method thereof (CN 112707606A), a garbage leachate total harmless treatment method and system (CN 112723653A) and the like. However, the prior art is mainly based on biochemical treatment, not only occupies large area, but also has high operation management requirements, and cannot be used for efficiently treating the percolate of the transfer station, for example, the invention application of a container type garbage transfer station percolate treatment system and a use method thereof (CN 112707606A) refers to a two-stage A/O-MBR unit, a three-dimensional electrocatalytic oxidation unit, a coagulating sedimentation tank, a primary sedimentation tank and a secondary sedimentation tank, has complex process and higher operation management requirements, and does not conform to the site situation of the garbage transfer station; in the application of the invention, the full-scale harmless treatment method and system (CN 112723653A) of landfill leachate mainly adopts high-temperature high-pressure catalytic wet oxidation treatment, membrane bioreactor treatment (two-stage nitrification-denitrification), membrane Fenton reactor treatment and degassing membrane deamination treatment to obtain standard water quality, but the system has high operation condition requirements, a plurality of auxiliary structures and complexity, and cannot realize better energy-saving and efficient removal effects.
In view of the fact that the existing technology and system for removing pollutants in water by using the percolate of the village and town refuse transfer station are complex and cannot be used for economically and efficiently removing pollutants in water, the invention provides a full-quantitative mobile technology for treating the percolate of the village and town refuse transfer station, which can serve a plurality of stations to ensure that the percolate outlet requirement can be met under the conditions of simple process and simple operation management, and has important value and significance for treating and utilizing the percolate of the village and town refuse transfer station in the current stage.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an innovative scheme, provides a device for stably treating garbage percolate of a village and town garbage transfer station by using a biochemical and electrocatalytic oxidation combined process, can realize full quantification and recycling, and simultaneously is economical, efficient and stable in operation.
In order to solve the problems, the invention adopts the following scheme:
a percolate treatment device of a miniaturized village and town refuse transfer station comprises an adjusting unit, an ABR pretreatment unit, a MAP unit, a three-dimensional electro-catalytic unit and a water outlet unit; wherein the ABR pretreatment unit, the MAP unit and the three-dimensional electrocatalytic unit can be made into skid-mounted devices, which are convenient for movement and can serve a plurality of sites. The adjusting unit is used for removing larger scum and particulate matters; the ABR pretreatment unit can effectively reduce the concentration of organic matters and reduce the load of a rear-end treatment process; the MAP unit consists of a water storage tank, a magnesium salt solution storage tank, a phosphate solution storage tank, an alkali liquor storage tank, a MAP integrated reaction device and a struvite precipitation concentration tank, and the MAP unit water storage tank is connected with the phosphate solution storage tank and the alkali liquor storage tank and is used for adjusting the pH value and the nitrogen-phosphorus ratio; the water outlet of the MAP unit water storage tank is connected with the water inlet of the MAP integrated reaction device through a first peristaltic pump, the MAP integrated reaction device is connected with the magnesium salt solution storage tank, magnesium salt is added to form MAP sediment, and sediment substances are connected with the struvite sediment concentration tank through a valve through a sediment outlet at the lower part; the three-dimensional electro-catalysis unit consists of an electro-catalysis adjusting water tank and a three-dimensional electro-catalysis device, wherein the adjusting water tank is connected with the acid liquid storage tank, and the pH value is adjusted back to be neutral; the water outlet of the electrocatalytic regulating water tank is conveyed to a three-dimensional electrocatalytic device through a third peristaltic pump for deepening treatment, and water discharged from the three-dimensional electrocatalytic device enters a water outlet unit; the water outlet unit is provided with a circulating pump and an on-line monitoring device.
A percolate treatment method of a miniaturized village and town refuse transfer station comprises an adjusting unit, an ABR pretreatment unit MAP unit, a three-dimensional electrocatalytic unit and a water outlet unit; the transfer station percolate is conveyed to the water inlet of the ABR pretreatment unit by the first lifting pump through the regulating unit which is fed by the water inlet pipe, the ABR pretreatment unit is divided into 5 compartments, flexible filler is filled in the 1 st to 4 th compartments, a precipitation compartment is arranged in the 5 th compartment, sludge precipitated in the precipitation compartment can flow back to the 1 st to 4 th compartments in a sectionalized way through the reflux pump, the water outlet of the ABR pretreatment unit is connected with the water inlet of the MAP system water storage tank, the water outlet of the MAP system water storage tank is connected with the water inlet of the MAP integrated reaction device, and sediment generated by the MAP integrated reaction device is connected with the struvite precipitation concentration tank through a valve of a lower precipitation outlet and is used for discharging formed sediment substances. The water outlet of the MAP integrated reaction device is used for conveying the effluent to an electrocatalytic regulating water tank through a second peristaltic pump, the pH value of the effluent is regulated to 7+/-0.5 in the regulating water tank, the water outlet of the electrocatalytic regulating water tank is connected with the water inlet of the three-dimensional electrocatalytic device through a third peristaltic pump, the water outlet of the three-dimensional electrocatalytic device is connected with the water inlet of a water outlet unit through a pipeline, and the circulating water outlet of the water outlet unit is connected with the circulating water inlet of the three-dimensional electrocatalytic device through a circulating pump to form circulation, so that percolate continuously and rapidly passes through the three-dimensional electrocatalytic device, and the mass transfer efficiency is improved; the water outlet unit is provided with an on-line monitoring system, the index is linked with the water outlet control system, and the water outlet can be discharged when the water quality reaches the standard. When the water outlet index is slightly higher, the circulating pump can be started, so that the water outlet circulates to the three-dimensional electro-catalytic device for further treatment.
Preferably, the water inlet of the adjusting unit is provided with a basket grid which can intercept larger scum and particulate matters, a baffle is arranged in the basket grid, and a water passing hole is formed in the middle of the baffle so as to intercept scum and deposited sludge in water.
Preferably, the adjusting unit is provided with a floating ball level gauge for controlling the liquid level.
Preferably, the water outlet tank and the three-dimensional electro-catalytic device form circulation through a circulating pump, so that percolate continuously and rapidly passes through the three-dimensional electro-catalytic device, and the mass transfer efficiency is improved.
Preferably, the MAP system water storage tank should be adjusted to ph=9.6 and phosphorus salt is added to adjust N: p=1: 1.15 adding magnesium salt into MAP integrated reaction device to regulate Mg 2+ :PO 4 3- ：NH 4+ ＝1：1.15：1.15。
Preferably, the filling rate of the flexible filler filled in the ABR pretreatment unit is 20-60%;
preferably, the reflux ratio of the ABR pretreatment unit is controlled to be 10-100%, so that the rising flow rate of water flow in the ABR pretreatment unit is controlled to be 0.2-0.5 m/s.
Preferably, the ratio of the widths of the upstream and downstream chambers of the ABR pretreatment unit is generally preferably controlled at 5:1 to 3:1, a step of; the residence time is controlled between 8 and 15 days.
Preferably, the MAP integrated reaction device adopts gradient stirring, namely, high speed of 10min/120r and low speed of 20min/60 r.
Preferably, the three-dimensional electrocatalytic device adopts a mode that a plurality of groups of electrodes are connected in series, the anode plate adopts a boron-doped diamond electrode or a ruthenium iridium coating-titanium-based DSA electrode and boron-doped diamond electrode combination, and the cathode adopts a stainless steel electrode.
Preferably, the particle electrode of the three-dimensional electrocatalytic device is prepared from activated carbon or modified activated carbon, graphite, ceramsite and the like, wherein the particle size of the particle electrode is 2-3 mm;
preferably, the hydraulic retention time of the three-dimensional electrocatalytic apparatus is 2-4 hours.
The invention has the following technical effects:
(1) The biochemical treatment and the physical and chemical treatment are combined into a process, so that the operation management is simple, the full-quantification and resource treatment is realized, and meanwhile, the process can be economically and efficiently operated stably;
(2) The anaerobic treatment efficiency can be effectively improved by adopting the ABR reactor and adding the filler, the total biological quantity is increased by utilizing the original invalid volume, and the loss of sludge is reduced;
(3) The ABR reactor, MAP and electrocatalytic process unit can be manufactured into skid-mounted garbage transfer station percolate treatment equipment, can serve a plurality of stations, is convenient for installation and use of small garbage stations in communities and villages and towns, and has small occupied area and strong applicability;
(4) The anode of the electrocatalytic unit adopts a boron-doped diamond electrode or a ruthenium iridium coating-titanium-based DSA electrode and boron-doped diamond electrode combination, the boron-doped diamond electrode has extremely high oxygen and chlorine evolution potential, the current efficiency is high, the energy consumption is low, and the ruthenium iridium coating-titanium-based DSA electrode can play a role in cooperatively removing active chlorine in water;
(5) The electrocatalytic unit can effectively improve the electrocatalytic oxidation treatment efficiency by applying the three-dimensional electrocatalytic oxidation technology, and electrolyte is not needed to be added.
Drawings
FIG. 1 is a schematic diagram of a system according to the present invention. The device comprises an adjusting unit, an ABR pretreatment unit, a precipitation unit, a MAP unit, a three-dimensional electro-catalytic unit and a water outlet unit;
FIG. 2 is a graph showing CODcr removal effect of the ABR process on village waste transfer station leachate;
FIG. 3 shows the CODcr and ammonia nitrogen removal effect of the three-dimensional electrocatalytic process on the leachate of the village and town refuse transfer station;
the device comprises an adjusting unit 1, an ABR pretreatment unit 2, a MAP system water storage tank 3, a fexite precipitation concentration tank 4, a MAP integrated reaction device 5, an adjusting water tank 6, a three-dimensional electro-catalytic device 7, a water outlet unit 8, a basket grid 9, a baffle plate 10, a floating ball liquid level meter 11, a lifting pump 12, a flexible filler 13, a guide wall 14, a biogas collection port 15, a manhole 16, a reflux pump 17, a first inclined tube 18, a centrifugal pump 19, a first mechanical stirrer 20, a first metering pump 21, a second metering pump 22, a phosphorus salt storage tank 23, an alkali liquid storage tank 24, a first pH meter 25, a first peristaltic pump 26, a magnesium salt storage tank 27, a third metering pump 28, a variable speed stirrer 29, a valve 30, a second inclined tube 31, a second peristaltic pump 32, an acid liquid storage tank 33, a fourth metering pump 34, a second mechanical stirrer 35, a second pH meter 36, a third peristaltic pump 37, an anode 38, a particle electrode 39, a cathode 40, a direct current regulated power supply 41, a circulating pump 42 and an online monitoring system 43.
Detailed Description
The invention will be described in detail below with reference to the attached drawings:
example 1: fig. 1 shows a mobile device and a method for full quantification of leachate of a small village and town refuse transfer station, which comprises an adjusting unit 1, an ABR pretreatment unit 2, a MAP system water storage tank 3, a MAP integrated reaction device 5, an adjusting water tank 6, a three-dimensional electrocatalytic device 7 and a water outlet unit 8 which are connected in sequence. The percolate firstly enters the regulating unit 1, larger scum and particulate matters are intercepted by the basket grid 9, a baffle 11 is arranged in the percolate, and a hole is formed in the middle of the baffle 10 to intercept scum and deposited sludge in water; the adjusting unit 1 is communicatedControlling the liquid level by a floating ball liquid level meter 11, and lifting the water discharged from the adjusting unit to the ABR pretreatment unit 2 by a lifting pump 12 when the liquid level reaches the designed maximum liquid level; the contact reaction of sewage and anaerobic sludge is realized by adding a flexible filler 13 and a guide wall 14 in a compartment 1-4 in the ABR pretreatment unit 2, so that organic matters and partial nitrogen and phosphorus are removed, a first inclined tube 18 is arranged in a compartment 5 for carrying out mud-water separation, and meanwhile, the sludge can be returned to the compartment 1-4 in a segmented manner through a reflux pump 17 in the compartment 5; the ABR pretreatment unit 2 is lifted to a MAP system water storage tank 3 through a centrifugal pump 19, the MAP system water storage tank 3 is respectively connected with a phosphorus salt storage tank 23 and an alkali liquor storage tank 24, a first mechanical stirrer 20 and a first pH meter 25 are arranged in the MAP system water storage tank, the ph=9.6 is adjusted through a first metering pump 21 and a second metering pump 22, and phosphorus salt is added to adjust N: p=1: 1.15, the effluent of the MAP system water storage tank 3 enters the MAP integrated reaction device 5 through a first peristaltic pump 26; the MAP integrated reaction apparatus 5 is connected with a magnesium salt storage tank 27 through a third metering pump 28 to adjust Mg 2+ :PO 4 3- ：NH 4+ The map integrated reaction device 5 is equipped with a variable speed stirrer 29, which is first fast and then slow during the reaction, to ensure that the precipitation effect is not affected while the reaction is fully performed, =1:1.15:1.15; the sediment of MAP integrated reaction unit 5 is connected with struvite sediment concentration jar 4 through below sediment export through valve 30, and the timing opens valve 30 and discharges the struvite sediment of deposit in the sedimentation zone of MAP integrated reaction unit 5's the second inclined tube 31 below to struvite sediment concentration jar 4, and the delivery port of MAP integrated reaction unit 5 is connected with the water inlet of regulating water tank 6 through second peristaltic pump 32. A second mechanical stirrer 35 and a second pH meter 36 are arranged on the adjusting water tank 6, and the acid liquid storage tank 33 conveys the acid liquid into the adjusting water tank 6 through a fourth metering pump 34 to adjust the pH to 7+/-0.5; the water outlet of the regulating water tank 6 is connected with a second peristaltic pump 37, percolate is conveyed to the three-dimensional electro-catalytic device 7, the three-dimensional electro-catalytic device 7 is in a bipolar electrode combination form and consists of an anode 38, a particle electrode 39 and a cathode 40, the device is powered by a direct-current regulated power supply 41, the particle electrode 39 is filled between polar plates, the current transmission efficiency and the reaction rate are improved through the particle electrode, the water outlet of the three-dimensional electro-catalytic device 7 is connected with the water inlet of a water outlet unit 8 through a pipeline, and the water outlet unit 8 is internally provided with an online monitoring deviceAnd the measuring system 43 is used for starting the circulating pump 42 to enable the water from the water outlet unit to flow back to the three-dimensional electro-catalytic device 7 to form circulation when the water outlet of the electro-catalytic unit in the water outlet unit does not reach the standard, and the mass transfer efficiency is improved by enabling the percolate to continuously and rapidly pass through the three-dimensional electro-catalytic device 7. And the water can be discharged until the on-line monitoring system 43 displays that the water quality reaches the standard.
Example 2: actual landfill leachate treatment was performed based on the treatment apparatus of example 1 to verify the capacity of the miniaturized village and town landfill leachate treatment apparatus and method for village and town landfill leachate treatment.
The garbage percolate used in the embodiment is from a garbage transfer station in villages and towns in Nanjing, the COD concentration is 9524+/-3270 mg/L, and the ammonia nitrogen concentration is 1041+/-150 mg/L. The ABR pretreatment unit 2 is pre-inoculated with activated sludge from a waste transfer station. The anode of the three-dimensional electro-catalytic device 8 adopts a boron-doped diamond electrode or a ruthenium iridium coating-titanium-based DSA electrode and boron-doped diamond electrode combination, the cathode adopts a stainless steel electrode (specification is 10cm multiplied by 10 cm), and the spacing between electrode plates is about 2cm. The device was filled with particle electrodes of pretreated active catalyst to a filling level of about 50%. In operation, the electrodes of the three-dimensional electrocatalytic device 7 are supplied with current via a dc regulated power supply 41.
The relevant experimental results in the operation process of the embodiment are as follows:
the processing device of this embodiment is firstly debugged and operated, so that the ABR pretreatment unit 2 runs continuously after finishing the early stage domestication, the hydraulic retention time is about 15 days, and the domestication process is divided into four stages: in the first stage (1-10 d), the inlet water is diluted percolate, the volume load is 0.5kg COD/m < 3 >, and the treatment efficiency reaches 91.6-95.2%; in the second stage (11-23 d), the water inlet is the stock solution of the leachate, the volume load is 1.0kgCOD/m < 3 >, the device is gradually adapted to the water quality condition of the landfill leachate, and the treatment effect is more than 90% at the 23 rd day; in the third stage (24-61 d), the inflow water is the stock solution of percolate, the volume load is 2.0kgCOD/m < 3 >, the load is rapidly increased to cause the poor sedimentation property of the sludge, and the COD removal effect is only 34% when the COD removal effect is the lowest; then, part of anaerobic sludge is added again, so that the MLSS=10980 mg/L in the reactor has stable 50d removal efficiency up to more than 60%, and the treatment effect is more than 80% at the 23 rd day; and in the fourth stage (61-90 d), the inflow water is the stock solution of the percolate, the normal operation can be realized when the volume load is 2.0kg COD/m < 3 >, and the COD removal rate is always stabilized to be more than 80%. The removal effect is shown in fig. 2.
The pretreated water enters the MAP unit at ph=9.6, mg 2+ :PO 4 3- ：NH 4+ Under the condition of being in a ratio of (1:1.15:1.15), the ammonia nitrogen and total phosphorus removal rates are 79.0% and 87.6% respectively by gradient stirring (10 min/120r high speed +20min/60r low speed).
The water treated by the front end enters a three-dimensional electro-catalytic unit, under the condition of pH=7+/-0.5, a boron-doped diamond electrode is adopted as an anode, pretreated columnar active carbon is adopted as a particle electrode, and the pH value is 60mA/cm 2 The electrolysis is carried out, the electrolysis effect is shown in figure 3, 99 percent of ammonia nitrogen and 87 percent of CODcr can be removed after 2 hours of electrolysis, 94 percent of CODcr can be removed after 3 hours, and the CODcr of the effluent can be less than 100.
In the process, the operation parameters can be optimized and adjusted according to actual requirements, such as the residence time of an ABR pretreatment unit, the dosage and stirring speed of a MAP system, the number of ruthenium iridium coating-titanium-based DSA electrodes and boron-doped diamond electrodes of a three-dimensional electro-catalytic unit, and the sizes of the units are correspondingly adjusted according to actual wastewater treatment conditions, so that the optimal wastewater treatment efficiency, the lowest energy consumption and the lowest device loss are taken as final consideration points.
The above embodiment is only a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the equivalent substitution or equivalent transformation are within the protection scope of the invention.
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