CN119555899A - A method and device for judging the suspended solids concentration of mixed liquor in a sewage treatment system - Google Patents
A method and device for judging the suspended solids concentration of mixed liquor in a sewage treatment system Download PDFInfo
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Abstract
The invention relates to the technical field of sewage treatment, in particular to a method and a device for judging suspended solid concentration of mixed liquid in a sewage treatment system. The method comprises the steps of respectively measuring the highest OUR of an activated sludge system under different MLSS concentration conditions in a detection device, and performing linear fitting on the measured highest OUR and the corresponding MLSS to obtain a formula for calculating the MLSS of the activated sludge system.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method and a device for judging suspended solid concentration of mixed liquid in a sewage treatment system.
Background
In an activated sludge wastewater treatment system, mixed liquor suspended solids concentration (MLSS) is an extremely critical control indicator. The mixed liquor suspended solids of the activated sludge system comprise microorganism groups with metabolic functions, residues of endogenous respiration and self oxidation of microorganisms, concentration of inert organic matters which are adsorbed by the activated sludge and cannot be biodegraded, and inorganic matters attached to the activated sludge. In the operation of the activated sludge system, if the concentration of the MLSS is low, the concentration of the active microorganisms is low, and the removal capability of various pollutants is insufficient, and if the concentration of the MLSS is too high, on one hand, more oxygen is consumed due to too many active microorganisms, and on the other hand, the aeration efficiency of the system is reduced, so that the pollutant removal effect of the system is affected.
The sewage treatment system is not generally provided with an MLSS on-line measuring instrument, and particularly, some sewage treatment systems which are located in remote areas and are unattended. Whereas the conventional method of laboratory measurement of MLSS is a gravimetric method, in which a long time is required to dry the filter paper, and no timely feedback of the result is obtained. Therefore, a method and a device for rapidly determining the suspended solid concentration of the mixed solution of the aerobic tank of the sewage treatment system are needed to be developed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a device for judging the suspended solid concentration of a mixed solution of a sewage treatment system, and the method is used for rapidly calculating the MLSS (anaerobic sludge control system) based on the linear relation between the highest OUR of activated sludge and the MLSS.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
The invention discloses a method for judging suspended solid concentration of mixed liquid of a sewage treatment system, which comprises the steps of respectively measuring the highest OUR of an activated sludge system under different MLSS concentration conditions in a detection device, and carrying out linear fitting on the measured highest OUR and the corresponding MLSS to obtain a formula for calculating the activated sludge MLSS.
Preferably, the highest OUR of the activated sludge is the sum of the highest OUR of the heterotrophic bacteria and the highest OUR of the autotrophic bacteria.
Preferably, the highest OUR of the heterotrophic bacteria is the DO lowering rate calculated after the DO lowering rate is stabilized after the carbon source is added to the activated sludge.
Preferably, the highest OUR of the autotrophic bacteria is the difference between the DO dropping rate calculated after the DO dropping rate is stabilized after ammonia nitrogen is added into the activated sludge and the DO dropping rate calculated after the DO dropping rate is stabilized after the autotrophic bacteria inhibitor is added into the activated sludge.
Correspondingly, a device for measuring the suspended solid concentration of mixed liquid of a sewage treatment system comprises a detection device, wherein the detection device comprises a detection box with a top cover, a stirring mechanism with adjustable height is vertically arranged in the detection box, a cylindrical groove with a downward opening is vertically arranged at the bottom of the box wall of the detection box, a heating rod is arranged in the cylindrical groove, an annular groove is vertically arranged at the top of the box wall of the detection box, a cooling pipe row in a serpentine arrangement is arranged in the annular groove, the heights of the cylindrical groove and the annular groove are smaller than the height of the detection box, a return pipe is arranged on the top cover, a one-way valve is arranged on the return pipe, the other end of the return pipe extends into the bottom of the detection box, and a pipe orifice at the end is bent downwards.
Preferably, the top end of the detection box is provided with an annular pressing strip, the bottom of the pressing strip is provided with a limiting strip extending into the annular groove, the width of the pressing strip is smaller than or equal to the thickness of the detection box, the bottom of the detection box is provided with an annular fixing plate, and the heating rod penetrates through the fixing plate and is fixed through a rubber sleeve.
Preferably, the bottom of the detection box is provided with an annular aeration pipe, the center of the aeration pipe is provided with an air inlet pipe, the side wall of the air inlet pipe is provided with a plurality of connecting pipes which are communicated with the aeration pipe, a plurality of air nozzles which are obliquely downwards arranged are arranged between the aeration pipe and the connecting pipes, and the air inlet pipe extends out of the detection box and is connected with an air pump.
Preferably, the side wall of the detection box is connected with a DO detector through a detection pipe, an outlet of the DO detector is connected with the detection box through a liquid outlet pipe, a peristaltic pump is arranged on the detection pipe, an exhaust pipe, a liquid adding hole and a pressure gauge are arranged on the top cover, and a telescopic hose is arranged at a position, close to the top cover, of the return pipe.
Preferably, the stirring mechanism comprises a motor fixed on the top cover, an output shaft of the motor extends into the detection box, a connecting rod and/or a stirring shaft with blades are detachably connected, a plug is arranged at one end of the connecting rod, a groove matched with the plug is formed in the output shaft of the motor, an inserting pile is arranged at the end part of the stirring shaft, an inserting groove matched with the inserting pile is formed in the other end of the connecting rod, and the inserting pile is matched with the groove in the same way.
Preferably, an OPR detector is arranged outside the detection box, a detection probe of the OPR detector is positioned in the detection box, a sliding rod is vertically arranged in the detection box, a sliding block is sleeved on the sliding rod, a clamping ring is arranged on the sliding block, the detection probe is clamped into the clamping ring for internal fixation, an adjusting screw rod corresponding to the position of the sliding rod is vertically arranged outside the detection box, a nut is arranged on the adjusting screw rod, and magnetic blocks are respectively arranged on the side walls corresponding to the nut and the sliding block.
The invention has the following beneficial effects:
1. The invention carries out linear fitting on the highest OUR and the MLSS by measuring the highest OUR under different MLSS concentration conditions of the activated sludge system, the obtained linear equation is the formula for calculating the MLSS, then the highest OUR is measured in daily operation of the sewage treatment system, and the MLSS is calculated according to the obtained linear equation, thereby rapidly obtaining the MLSS concentration of the aerobic tank of the sewage treatment system and providing guidance for the control of the MLSS concentration and the discharge of residual sludge.
2. According to the invention, through the detection device, DO, ammonia nitrogen, nitrite nitrogen and the like of the activated sludge can be detected in real time, meanwhile, through the return pipe, gas overflowed from the activated sludge can be returned to the activated sludge to realize enhanced aeration, and the detection probe of the OPR detector capable of moving up and down is arranged in the detection box, so that the detection of related data at different positions can be realized, and the detection position of the detection probe can be flexibly adjusted according to the liquid level depth. The detection device disclosed by the invention has high flexibility in the use process, and can be correspondingly adjusted according to different operation processes.
Drawings
FIG. 1 is a schematic diagram of a detecting device according to the present invention;
FIG. 2 is an A-A view of the test cassette of FIG. 1;
FIG. 3 is an enlarged view of part of A of FIG. 2;
FIG. 4 is a schematic view of an aeration tube structure;
FIG. 5 is a schematic view of a connecting rod and stirring shaft;
In the figure, a top cover 1, a detection box 2, a heating rod 3, a cooling tube row 4, a return tube 5, a one-way valve 6, a pressing strip 7, a fixing plate 8, an aeration tube 9, an air inlet tube 10, a connecting tube 11, an air tap 12, a DO detector 13, a detection tube 14, a liquid outlet tube 15, a peristaltic pump 16, an air outlet tube 17, a pressure gauge 18, a telescopic hose 19, a motor 20, a connecting rod 21, a stirring shaft 22, a plug 23, an insertion pile 24, an insertion groove 25, an OPR detector 26, a detection probe 27, a slide bar 28, a slide block 29, a clamping ring 30, an adjusting screw 31, a nut 32, a magnetic block 33, a base 34, a strip groove 35 and a liquid discharge tube 36 are shown in the figure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical means used in the examples are conventional means well known to those skilled in the art unless otherwise indicated.
The invention discloses a method for judging suspended solid concentration of mixed liquor of a sewage treatment system, which comprises the steps of respectively measuring the highest OUR (oxygen consumption rate) of an activated sludge system under different MLSS concentration conditions in a detection device, and carrying out linear fitting on the measured highest OUR and the corresponding MLSS to obtain a formula for calculating the activated sludge MLSS. Wherein the highest OUR of the activated sludge is the sum of the highest OUR of the heterotrophic bacteria and the highest OUR of the autotrophic bacteria. The highest OUR of the heterotrophic bacteria is the DO lowering rate calculated after the DO lowering rate is stabilized after adding the carbon source into the activated sludge. The highest OUR of the autotrophic bacteria is the difference between the DO dropping rate calculated after the DO dropping rate is stabilized after ammonia nitrogen is added into the activated sludge and the DO dropping rate calculated after the DO dropping rate is stabilized after the autotrophic bacteria inhibitor is added into the activated sludge.
Specifically, the invention aims to rapidly determine the suspended solid concentration of the mixed solution of the aerobic tank of the sewage treatment system, and the specific process is as follows:
(1) And taking the activated sludge mixed liquor in the aerobic tank of the sewage treatment system with stable operation, measuring the suspended solid concentration (MLSS) according to a gravimetric method (CJ 221-2005), and diluting or concentrating the activated sludge mixed liquor into the activated sludge mixed liquor with different MLSS concentrations according to different proportions.
(2) The highest OUR of the activated sludge with different MLSS concentrations is measured respectively, and the measuring steps are as follows:
i) Taking a certain volume of activated sludge mixed solution in a detection device, adjusting the activated sludge mixed solution to a certain temperature, continuously stirring, adding sodium chlorate solution and ATU (propenyl thiourea) solution to ensure that the concentration of the sodium chlorate solution and the ATU (propenyl thiourea) solution in the activated sludge mixed solution is 2.13g/L and 5mg/L respectively, so as to inhibit the activity of autotrophic bacteria, aerating until the autotrophic bacteria is close to saturation, stopping aerating, recording DO (recording time 1-3 min) at regular time after the DO descending speed is stable, and calculating the DO descending speed, wherein the DO descending speed is recorded as R 1.
Ii) aerating until the DO is nearly saturated, adding a sodium acetate solution, enabling the COD of the added mixed solution to be about 200mg/L, stopping aerating, recording DO (recording time 1-3 min) at fixed time after the DO descending speed is stable, and calculating the DO descending speed, wherein the DO descending speed is recorded as R 2.
Iii) And (3) taking the activated sludge mixed solution obtained in the step i), adjusting the temperature to be the same, continuously stirring, aerating until the temperature is close to saturation, adding the ammonium chloride and sodium nitrite mixed solution, enabling the concentration of NH 4 -N and the concentration of NO 2 -N of the added mixed solution to be about 5mg/L, stopping aerating, recording DO (recording time 1-3 min) at regular time after the DO descending speed is stable, and calculating the DO descending speed, wherein the DO descending speed is recorded as R 3.
The highest OUR is calculated by the method of highest OUR of the heterotrophic bacteria: OUR (max; HET) =R 2, highest OUR of the autotrophic bacteria: OUR (max; A) =R 3-R1, total highest OUR: OUR (max) =OUR (max; HET) +OUR (max; A).
(3) And (3) performing linear fitting on the measured highest OUR and the corresponding MLSS, wherein a linear equation obtained by fitting is a formula for rapidly calculating the MLSS of the activated sludge.
The highest OUR is rapidly determined according to the method described above during routine operation of the wastewater treatment system, and the MLSS is calculated based on the linear equation that has been obtained. If the operation mode, season, etc. of the system change, the linear relation between the highest OUR and the MLSS needs to be recalibrated.
The present invention calculates MLSS based on the linear relationship of activated sludge maximum OUR to MLSS. According to an activated sludge model ASM1 proposed by the International Water quality Association (IAWQ), the consumption rates of dissolved oxygen for aerobic growth of heterotrophic bacteria and autotrophic bacteria in an activated sludge system, namely OUR of the heterotrophic bacteria and the autotrophic bacteria, are respectively:
Wherein the yield coefficient of Y H、YA -heterotrophic bacteria and autotrophic bacteria is 0.67 and 0.24 mg of microorganism/mg of substrate, the maximum specific growth rate of mu H、μA -heterotrophic bacteria and autotrophic bacteria is 0.24, the concentration of d -1;SS -biodegradable organic matters is mgCOD/L, the half-saturation constant of K S -biodegradable organic matters is mgCOD/L, 20mgCOD/L, S NH -ammonia nitrogen concentration, mgN/L, K NH -ammonia nitrogen half-saturation constant, mgN/L, 1mgN/L, S O -dissolved oxygen concentration, mg/L, K O,H、KO,A -dissolved oxygen half-saturation concentration, mg/L, 0.2mg/L, 0.4mg/L, X H、XA -active heterotrophic bacteria and autotrophic bacteria concentration and mgCOD/L are respectively.
According to the above formula, i) the maximum specific growth rate in the formula remains substantially unchanged if the temperature remains stable, ii) the factors in the formula are as follows if the readily degradable organic matter and ammonia nitrogen are sufficientClose to 1. In measuring OUR, the activated sludge mixture is aerated to near saturation Also close to 1. Thus, the highest OUR of heterotrophic and autotrophic bacteria is a linear function of their concentration. Also because the active sludge content of a system operating stably remains substantially unchanged, the active microorganism fraction in the suspended solids can be considered to remain substantially unchanged, and the MLSS can be calculated from the highest OUR.
The invention is further illustrated below in conjunction with specific examples.
Examples
The rapid determination process of the suspension solid concentration of the mixed liquid of the activated sludge system comprises the following steps:
(1) For an aerobic tank of integrated sewage treatment equipment and an MBR tank of a sewage treatment plant built by an environmental protection company, the MLSS is calculated according to the linear relation between the highest OUR and the MLSS.
(2) The activated sludge OUR was measured using a measuring apparatus developed by the institute of biological research of adult of the national academy of sciences.
(3) And (3) taking an activated sludge mixed solution in an aerobic tank of integrated sewage treatment equipment and an MBR tank of a sewage treatment plant, measuring suspended solid concentration (MLSS) of the activated sludge mixed solution according to a weight method (CJ 221-2005), and diluting or concentrating the activated sludge mixed solution into activated sludge mixed solutions with different MLSS concentrations according to different proportions.
(4) The detection device disclosed by the invention is used for respectively measuring the highest OUR under the condition of different MLSS concentrations of the activated sludge, and the measurement steps are as follows:
i) Taking a certain volume of activated sludge mixed solution in a detection device, adjusting the activated sludge mixed solution to a certain temperature, continuously stirring, adding sodium chlorate solution and ATU solution to ensure that the concentration of the sodium chlorate solution and the ATU solution in the activated sludge mixed solution is 2.13g/L and 5mg/L respectively so as to inhibit the activity of autotrophic bacteria, aerating until the autotrophic bacteria is close to saturation, stopping aerating, recording DO (recording time is 1-3 min) at regular time after the DO descending speed is stable, and calculating the DO descending speed, wherein the DO descending speed is recorded as R 1.
Ii) aerating until the DO is nearly saturated, adding a sodium acetate solution, enabling the COD of the added mixed solution to be about 200mg/L, stopping aerating, recording DO (recording time 1-3 min) at fixed time after the DO descending speed is stable, and calculating the DO descending speed, wherein the DO descending speed is recorded as R 2.
Iii) And (3) taking the activated sludge mixed solution obtained in the step i), adjusting the temperature to be the same, continuously stirring, aerating until the temperature is close to saturation, adding the ammonium chloride and sodium nitrite mixed solution, enabling the concentration of NH 4 -N and the concentration of NO 2 -N of the added mixed solution to be about 5mg/L, stopping aerating, recording DO (recording time 1-3 min) at regular time after the DO descending speed is stable, and calculating the DO descending speed, wherein the DO descending speed is recorded as R 3.
The highest OUR is calculated as OUR (max; HET) =r 2,OUR(max;A)＝R3-R1, OUR (max) =our (max; HET) +our (max; a).
(5) And linearly fitting the measured highest OUR of activated sludge in the aerobic tank of the integrated sewage treatment equipment and the MBR tank of a certain sewage treatment plant with the corresponding MLSS, wherein a linear equation obtained by fitting is a formula for rapidly calculating the MLSS of the activated sludge. If the operation mode, season, etc. of the system change, the linear relation between the highest OUR and the MLSS needs to be recalibrated. Fitting data for the highest OUR to the corresponding MLSS is shown in table 1.
(6) The highest OUR of activated sludge, the MLSS calculated from the highest OUR, the MLSS measured by the gravimetric method, the relative error, and the linear formulas of the highest OUR and the MLSS measured by the aerobic tank in the operation of the integrated sewage treatment apparatus are summarized in Table 2. Table 3 summarizes the linear formulas of the highest OUR of activated sludge, the MLSS calculated from the highest OUR, the MLSS measured by weight, the relative error, and the highest OUR and MLSS measured by MBR tanks of a sewage treatment plant.
TABLE 1 fitting data summary table of highest OUR with corresponding MLSS
TABLE 2 MLSS data summary table of aerobic tank of sewage treatment plant calculated from highest OUR
TABLE 3 calculation of MBR pool MLSS data summary table for certain Sewage treatment plant based on the highest OUR
The results show that the aerobic tank of the integrated sewage treatment device and the MBR tank MLSS of a sewage treatment plant have good linear relation with the highest OUR of activated sludge as shown in the table 1. As shown in Table 2, the average value of the MLSS calculated values of the aerobic tank of the integrated sewage treatment equipment is 2478.6mg/L, the average value of the MLSS measured values is 2439.5mg/L, and the average value of the relative error is 8.05%. As shown in Table 3, the average value of the MLSS calculation values of the MBR tank of a sewage treatment plant was 19028.7mg/L, the average value of the MLSS measurement values was 20144.4mg/L, and the average value of the relative error was 8.73%. Therefore, the calculation of MLSS from the linear relationship of OUR (max) to MLSS in an activated sludge system has considerable accuracy.
Referring to fig. 1 to 5, the invention also discloses a device for measuring the suspended solid concentration of the mixed liquor of the activated sludge system, namely, the integrated sewage treatment equipment aerobic tank in the embodiment comprises a detection device, wherein the detection device comprises a detection box 2 with a top cover 1, the top cover is hinged with the detection box and can be sealed and fixed through a buckle, a liquid discharge pipe 36 is arranged at the bottom of the detection box, a valve is arranged on the liquid discharge pipe, and the activated sludge can be discharged after the reaction is completed. The temperature sensor is characterized in that a stirring mechanism with adjustable height is vertically arranged in the detection box 2, a cylindrical groove with a downward opening is vertically arranged at the bottom of the box wall of the detection box 2, a heating rod 3 is arranged in the cylindrical groove, heating is realized by electrifying the heating rod, meanwhile, the quantity of electrifying the heating rod can be selected according to the requirement, the overhigh temperature in the detection box is avoided, an annular groove is vertically arranged at the top of the box wall of the detection box 2, the annular groove is arranged around the detection box in a circle, a cooling tube row 4 which is arranged in a serpentine shape is arranged in the annular groove, the cooling tube row is also arranged around the detection box, the inlet end and the outlet end of the cooling tube row are adjacent or close to each other, the side wall of the detection box extends out of the detection box and is connected with the cooling box, cooling water or cooling liquid is conveyed into the cooling tube row through a pump when cooling is required, and is discharged into the cooling box through the outlet end, so that a circulation is formed, and the cooling box has a refrigerating function. In order to avoid condensation of water droplets in the annular groove, an outlet penetrating the detection tank is provided in a side wall of the bottom of the annular groove, and the condensed water can be discharged through a connecting pipe (not shown).
Furthermore, the height sum of the cylindrical groove and the annular groove is smaller than the height of the detection box 2, so that a certain distance is reserved between the cylindrical groove and the annular groove, a return pipe 5 is arranged on the top cover 1, a one-way valve 6 is arranged on the return pipe 5, the other end of the return pipe 5 extends into the bottom of the detection box 2, and a pipe orifice at the end is bent downwards. The return pipe is arranged, so that the gas in the aeration process can enter the detection box again through the return pipe to strengthen the aeration effect. Meanwhile, a one-way valve is arranged to enable the gas to move from top to bottom. The end part of the return pipe positioned in the detection box is bent downwards, so that activated sludge and the like are prevented from entering the return pipe, and the return pipe is prevented from being blocked.
Furthermore, in order to avoid the cooling tube row from being exposed outside, the top end of the detection box 2 is provided with an annular pressing strip 7, the bottom of the pressing strip 7 is provided with a limiting strip extending into the annular groove, so that the annular groove forms a relatively closed space, the width of the pressing strip 7 is smaller than or equal to the thickness of the detection box 2, meanwhile, the pressing strip and the limiting strip can be made of rubber materials and matched with a top cover to seal the detection box, the bottom of the detection box 2 is provided with an annular fixing plate 8, the heating rod 3 penetrates through the fixing plate 8 and is fixed through a rubber sleeve, namely the heating rod is fixed on the fixing plate, further, the fixing plate penetrates through the rubber sleeve, the heating rod penetrates through the rubber sleeve to be fixed, the purpose of heat insulation is achieved, and the wiring end of the heating rod is exposed outside the fixing plate. Of course, control of the heating rate can be achieved by selecting the number of heating rods to be mounted on the fixed plate. Meanwhile, the cooling tube bank is combined, so that the detection box is heated and cooled.
Further, the bottom of the detection box 2 is provided with an annular aeration pipe 9, in order to make aeration more uniform, the aeration pipe is provided with a circle along the inner bottom edge of the detection box, the center of the aeration pipe 9 is provided with an air inlet pipe 10, the air inlet pipe penetrates through the bottom of the detection box, the side wall of the air inlet pipe 10 is provided with a plurality of connecting pipes 11 which are communicated with the aeration pipe 9, a plurality of air nozzles 12 which are arranged obliquely downwards are arranged between the aeration pipe 9 and the connecting pipes 11, the inclination angle is less than or equal to 30 degrees, active sludge is prevented from entering the air nozzles to a certain extent, the air inlet pipe 10 extends out of the detection box 2 and is connected with an air pump, the air pump can be connected with an air bottle, and can also be directly communicated with the outside according to the type of the aeration gas, such as oxygen or air and the like. Through filling gas into the air inlet pipe, the aeration pipe is sprayed out through the connecting pipe and the air tap on the aeration pipe, thereby realizing uniform aeration and avoiding uneven aeration caused by concentrated aeration.
Further, the side wall of the detection box 2 is connected with a DO detector 13 through a detection tube 14, and one end of the detection tube extending into the detection box can be connected with a telescopic tube, so that different detection depths can be selected according to actual conditions, and the arrangement of the telescopic tube is determined according to the depth of activated sludge in the detection box and is installed in advance. The outlet of the DO detector 13 is connected with the detection box 2 through a liquid outlet pipe 15, a peristaltic pump 16 is arranged on the detection pipe 14, liquid is pumped into the DO detector for detection through the peristaltic pump, and the liquid is conveyed into the detection box after detection is completed. Meanwhile, in order to avoid the blockage of the pipe orifice of the liquid outlet pipe, one end of the liquid outlet pipe extending into the detection box is bent downwards.
Further, an exhaust pipe 17, a liquid adding hole and a pressure gauge 18 are arranged on the top cover 1, and a telescopic hose 19 is arranged at the position, close to the top cover 1, of the return pipe 5. The other end of the exhaust pipe can be connected with a collecting bottle, the redundant gas after aeration and saturation is collected, meanwhile, a pressure gauge is combined, a valve on the exhaust pipe is selectively opened for exhausting and collecting by monitoring the pressure condition in the detection box, an electromagnetic valve can be selected for the valve, and the numerical change of the pressure gauge and the opening of the valve can be monitored by a controller. The flexible hose sets up the one section on the back flow, and the position that sets up is close to the articulated department of top cap and detection case, when opening the top cap, and the back flow does not influence its opening and closing.
Further, the stirring mechanism comprises a motor 20 fixed on the top cover 1, an output shaft of the motor 20 extends into the detection box 2, a connecting rod 21 and/or a stirring shaft 22 with blades are detachably connected with the motor, the connecting rod is arranged to lengthen the length of the whole stirring shaft, and the stirring position is adjusted according to the liquid level condition in the detection box. Therefore, at least one connecting rod can be arranged, or the connecting rod can be arranged, and the output shaft of the motor and the stirring shaft can be directly fixed. Specifically, a plug 23 is arranged at one end of the connecting rod 21, a groove matched with the plug 23 is arranged on an output shaft of the motor 20, an insertion pile 24 is arranged at the end of the stirring shaft 22, an insertion groove 25 matched with the insertion pile 24 is arranged at the other end of the connecting rod 21, and the insertion pile 24 is matched with the groove. Meanwhile, through holes are formed in the plug, the inserting pile, the inserting groove and the groove in a penetrating mode, when the connecting rod, the output shaft and the stirring shaft are connected in an inserting mode, after the through holes of all the parts correspond to each other, the bolts penetrate through the through holes to conduct two-by-two fixation.
Further, the OPR detector 26 is arranged outside the detection box 2, a plurality of OPR detectors 26 can be arranged according to requirements, the detection probes 27 of the OPR detector 26 are positioned in the detection box 2, namely, the electric wires of the OPR detector and the detection probes penetrate through the detection box and are fixed through sealing rubber, namely, the sealing rubber penetrates through the detection box, and the electric wires penetrate through the sealing rubber. The detection box 2 is internally and vertically provided with a sliding rod 28, the sliding rod 28 is sleeved with a sliding block 29, the sliding block 29 is provided with a clamping ring 30, the detection probe 27 is clamped into the clamping ring 30 to be fixed, the clamping ring is two arc-shaped blocks and has a certain deformation capacity, the detection probe is fixed in the clamping ring, the detection box 2 is externally and vertically provided with an adjusting screw 31 corresponding to the position of the sliding rod 28, the adjusting screw 31 is provided with a nut 32, and the side walls corresponding to the nut 32 and the sliding block 29 are respectively provided with a magnetic block 33. It is to be noted that the slide bar is the polished rod, and the both ends of slide bar and adjusting screw are fixed through base 34 respectively, carry the test probe through the slider and reciprocate along the slide bar to realize detecting the activated sludge of different positions, simultaneously, also adjust the position of test probe according to the liquid level condition in the detection case. The screw rod and the nut can be selected by the adjusting screw rod and the nut, and can be driven to rotate by a motor. And the magnetic blocks are arranged on the nut and the sliding block, so that the detection probe can be driven to move up and down outside the detection box.
Further, in order to avoid the influence of the wall thickness of the detection box on the suction force of the magnetic blocks, a strip-shaped groove 35 is vertically formed outside the detection box, and the adjusting screw is arranged in the strip-shaped groove, so that the thickness between the two magnetic blocks is reduced, the suction force of the magnetic blocks is increased, and the detection probe is prevented from falling into the detection box.
Furthermore, in order to enable the detection probe to move up and down, the electric wires on the detection probe are spirally arranged, so that the up and down movement of the detection probe is not affected, and the electric wires are stored to a certain extent.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (10)
1. A method for judging suspended solid concentration of mixed liquid of sewage treatment system is characterized by comprising the steps of measuring highest OUR under different MLSS concentration conditions of an activated sludge system in a detection device respectively, and carrying out linear fitting on the measured highest OUR and corresponding MLSS to obtain a formula for calculating the MLSS of the activated sludge.
2. The method for determining suspended solids concentration of a wastewater treatment system mixture according to claim 1, wherein the highest OUR of the activated sludge is a sum of the highest OUR of the heterotrophic bacteria and the highest OUR of the autotrophic bacteria.
3. The method for determining suspended solids concentration of a wastewater treatment system according to claim 2, wherein the highest OUR of the heterotrophic bacteria is a DO lowering rate calculated after the DO lowering rate is stabilized after a carbon source is added to the activated sludge.
4. The method for judging suspended solids concentration of a mixed solution of a sewage treatment system according to claim 2, wherein the highest OUR of the autotrophic bacteria is a difference between a DO lowering rate calculated after the DO lowering rate is stabilized after ammonia nitrogen is added to the activated sludge and a DO lowering rate calculated after the DO lowering rate is stabilized after the autotrophic bacteria inhibitor is added to the activated sludge.
5. A device for measuring the suspended solid concentration of mixed liquor of a sewage treatment system according to any one of claims 1-4 is characterized by comprising a detection device, wherein the detection device comprises a detection box (2) with a top cover (1), a stirring mechanism with adjustable height is vertically arranged in the detection box (2), a cylindrical groove with a downward opening is vertically arranged at the bottom of the box wall of the detection box (2), a heating rod (3) is arranged in the cylindrical groove, an annular groove is vertically arranged at the top of the box wall of the detection box (2), a cooling pipe row (4) in a serpentine arrangement is arranged in the annular groove, the heights of the cylindrical groove and the annular groove are smaller than those of the detection box (2), a return pipe (5) is arranged on the top cover (1), a one-way valve (6) is arranged on the return pipe (5), the other end of the return pipe (5) stretches into the bottom of the detection box (2), and a pipe orifice at the end is arranged downwards.
6. The device for judging suspended solid concentration of mixed liquid of sewage treatment system according to claim 5, wherein the top end of the detection box (2) is provided with an annular pressing strip (7), the bottom of the pressing strip (7) is provided with a limiting strip extending into the annular groove, the width of the pressing strip (7) is smaller than or equal to the thickness of the detection box (2), the bottom of the detection box (2) is provided with an annular fixing plate (8), and the heating rod (3) penetrates through the fixing plate (8) and is fixed through a rubber sleeve.
7. The device for judging suspended solid concentration of mixed liquor of sewage treatment system according to claim 5, wherein an annular aeration pipe (9) is arranged at the bottom of the detection box (2), an air inlet pipe (10) is arranged at the center of the aeration pipe (9), a plurality of connecting pipes (11) are arranged on the side wall of the air inlet pipe (10) and communicated with the aeration pipe (9), a plurality of air nozzles (12) which are obliquely downwards arranged are arranged between the aeration pipe (9) and the connecting pipes (11), and the air inlet pipe (10) extends out of the detection box (2) and is connected with an air pump.
8. The device for judging suspended solid concentration of mixed liquor of sewage treatment system according to claim 5, wherein the side wall of the detection box (2) is connected with a DO detector (13) through a detection pipe (14), the outlet of the DO detector (13) is connected with the detection box (2) through a liquid outlet pipe (15), a peristaltic pump (16) is arranged on the detection pipe (14), an exhaust pipe (17), a liquid adding hole and a pressure gauge (18) are arranged on the top cover (1), and a telescopic hose (19) is arranged at the position, close to the top cover (1), of the return pipe (5).
9. The device for judging suspended solid concentration of mixed liquor of sewage treatment system according to claim 5, wherein the stirring mechanism comprises a motor (20) fixed on the top cover (1), an output shaft of the motor (20) stretches into the detection box (2), a connecting rod (21) and/or a stirring shaft (22) with blades are detachably connected, a plug (23) is arranged at one end of the connecting rod (21), a groove matched with the plug (23) is formed in an output shaft of the motor (20), an inserting pile (24) is arranged at the end of the stirring shaft (22), an inserting groove (25) matched with the inserting pile (24) is formed in the other end of the connecting rod (21), and the inserting pile (24) is matched with the groove in the same way.
10. The device for judging suspended solid concentration of mixed liquid of sewage treatment system according to claim 5, wherein an OPR detector (26) is arranged outside the detection box (2), a detection probe (27) of the OPR detector (26) is positioned in the detection box (2), a sliding rod (28) is vertically arranged in the detection box (2), a sliding block (29) is sleeved on the sliding rod (28), a clamping ring (30) is arranged on the sliding block (29), the detection probe (27) is clamped into the clamping ring (30) for internal fixation, an adjusting screw (31) corresponding to the position of the sliding rod (28) is vertically arranged outside the detection box (2), a nut (32) is arranged on the adjusting screw (31), and magnetic blocks (33) are respectively arranged on the corresponding side walls of the nut (32) and the sliding block (29).
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