CN214167480U - Continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupling endogenous denitrification sewage treatment system - Google Patents

Continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupling endogenous denitrification sewage treatment system Download PDF

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CN214167480U
CN214167480U CN202022616630.5U CN202022616630U CN214167480U CN 214167480 U CN214167480 U CN 214167480U CN 202022616630 U CN202022616630 U CN 202022616630U CN 214167480 U CN214167480 U CN 214167480U
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sludge
zone
denitrification
tank
denitrification reaction
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张树军
蒋勇
王聪
谷鹏超
周桐
陈刚新
曲之明
李琨
白宇
刘垚
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Beijing Drainage Group Co Ltd
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Beijing Drainage Group Co Ltd
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Abstract

The utility model belongs to the technical field of sewage biological treatment, a continuous flow denitrification dephosphorization series connection anaerobic ammonia oxidation coupling endogenous denitrification's sewage treatment system is disclosed. The system comprises a raw water pool A2An O reaction tank, a denitrification reaction tank, a sludge storage tank and a control unit. The utility model discloses can ensure that each combination technology is higher to nitrogen phosphorus clearance, and economy, stable, sludge output is few, aeration energy consumption is low, green.

Description

Continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupling endogenous denitrification sewage treatment system
Technical Field
The utility model belongs to the technical field of sewage biological treatment, specifically, relate to the endogenous denitrification's of anaerobic ammonia oxidation coupling sewage treatment system is established ties in continuous flow denitrification dephosphorization.
Background
Tradition A2The O process is generally applied to large-scale sewage treatment plants at home and abroad, the traditional nitrification/denitrification is utilized for denitrification, and only the A process is applied to municipal sewage with low carbon-nitrogen ratio and sludge digestion liquid wastewater with higher ammonia nitrogen concentration2The O process is difficult to obtain the ideal synchronous removal effect of nitrogen and phosphorus or denitrification effect.
Aiming at the denitrification process, the anaerobic ammonia oxidation technology shows great advantages: no carbon source is needed, the aeration energy consumption is low, the excess sludge yield is low, and the greenhouse gas emission is low. However, if the anaerobic ammonium oxidation technology is used as an independent denitrification technology for sewage treatment, the highest nitrogen removal rate is 89%, further improvement is difficult, and the short sludge age, dissolved oxygen and organic matters required by phosphorus removal are difficult to be considered at the same time, so that the phosphorus removal effect is poor.
For the dephosphorization process, most of the applications mainly adopt a biological method as a main method: anaerobic phosphorus release and aerobic phosphorus absorption are carried out, and phosphorus is removed through sludge discharge; meanwhile, chemical agents are added to realize chemical phosphorus removal in an auxiliary mode so as to reach the discharge standard of phosphorus. The denitrification dephosphorization technology can utilize nitrate nitrogen and nitrite nitrogen as electron acceptors, realizes 'one carbon dual-purpose' in an anoxic zone, saves organic matters utilized by the traditional denitrification, saves dissolved oxygen required by the traditional dephosphorization, and realizes the synchronous removal of nitrogen and phosphorus. The denitrification dephosphorization process generally has a longer anoxic zone, the total hydraulic retention time of the anaerobic zone and the anoxic zone is far longer than that of the aerobic zone, the aerobic phosphorus uptake in the denitrification dephosphorization process mainly plays a role in guaranteeing the control, the dissolved oxygen is generally not high, the process conditions enable microorganisms to fully store organic matters in water into carbon source substances in cells, the microorganisms grow slowly under the condition of low DO, the maximum accumulation of internal carbon sources can be realized, the internal carbon sources can be used for further strengthening denitrification, and the system can obtain higher TN removal rate.
In conclusion, the denitrification dephosphorization, the endogenous denitrification and the anaerobic ammonia oxidation process are combined, the advantages of the processes are fully exerted, and higher denitrification and dephosphorization efficiency can be obtained, so that the process for treating the municipal sewage with the low carbon-nitrogen ratio by coupling the continuous flow denitrification dephosphorization, the serial anaerobic ammonia oxidation and the endogenous denitrification is provided at the forefront.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the defects of the prior art, and provides a sewage treatment system with continuous flow denitrification and dephosphorization, series anaerobic ammonia oxidation coupling and endogenous denitrification. The utility model discloses can rationally solve the contradiction in aspects such as the phosphorus bacteria anaerobism is released to nitrate influence in organic matter, oxygen, sludge age and the backward flow mud of denitrogenation and dephosphorization microorganism, can realize that the high efficiency of nitrogen phosphorus is got rid of, and economic environmental protection is the best denitrogenation dephosphorization technology of newly-built of low carbon-nitrogen ratio municipal sewage and high ammonia-nitrogen concentration mud digestive juice waste water, sewage treatment plant upgrading transformation and sewage advanced treatment plant of handling.
In order to achieve the above object, the utility model provides a continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupling endogenous denitrification's sewage treatment system, this system includes raw water pond, A2The system comprises an O reaction tank, a denitrification reaction tank, a sludge storage tank and a control unit;
a is described2The O reaction tank comprises an anaerobic zone, an anoxic zone and an aerobic zone; the anaerobic zone, the anoxic zone and the aerobic zone are communicated through a partition plate with a through hole at the bottom or the upper part in sequence; the raw water pool is connected with the water inlet end of the anaerobic zone through a water inlet pumpConnecting; the anaerobic zone and the anoxic zone are respectively provided with a first stirring device and a second stirring device; the aerobic zone is provided with a first aerator, a first online dissolved oxygen detector, an online COD detector and an online phosphate detector, the water outlet end of the aerobic zone is connected with an intermediate sedimentation tank, the intermediate sedimentation tank is respectively connected with the anaerobic zone and a first sludge discharge valve through a first sludge reflux pump, and the first sludge discharge valve is connected with the sludge storage tank;
the denitrification reaction tank comprises a plurality of denitrification reaction zones, and the former denitrification reaction zone is communicated with the latter denitrification reaction zone through a partition plate with a through hole at the bottom or the upper part; the water outlet end of the intermediate sedimentation tank is connected with the water inlet end of the first denitrification reaction zone; the first denitrification reaction zone is provided with a third stirring device and a second aerator; the other denitrification reaction areas are provided with third aerators; an MBR membrane module, a second online dissolved oxygen detector, an online ammonia nitrogen detector and an online nitrate nitrogen detector are also arranged in the last denitrification reaction zone; the MBR membrane component is connected with a water production pump, the water production pump is used for discharging the effluent of the denitrification reaction tank out of the system and/or refluxing the effluent to the anoxic zone through a water production reflux valve, the last denitrification reaction zone is respectively connected with the first denitrification reaction zone and a second sludge discharge valve through a second sludge reflux pump, and the second sludge discharge valve is connected with the sludge storage tank;
the sludge storage tank is also respectively connected with one end of the raw water tank and one end of a sludge pump, the other end of the sludge pump is provided with a sludge regulating valve and a system main sludge discharge valve, the sludge regulating valve is connected with the first denitrification reaction zone, and the system main sludge discharge valve is used for discharging system sludge out of the system;
the control unit is used for chain reaction control of the system.
Preferably, the first aerator, the second aerator and the third aerator are all connected to a blower.
Preferably, the volume ratio of the anaerobic zone to the anoxic zone to the aerobic zone is 1:1 to 5:1 to 2.
Preferably, the anoxic zone is a plurality of zones.
Preferably, the plurality of anoxic zones are communicated with each other through a partition plate with a through hole at the bottom or the upper part.
Preferably, the plurality of anoxic zones are provided with second stirring devices.
Preferably, a first anoxic zone of the plurality of anoxic zones is communicated with the anaerobic zone through a partition plate with through holes at the bottom or the upper part.
Preferably, the last anoxic zone of the plurality of anoxic zones is communicated with the aerobic zone through a partition plate with a through hole at the bottom or the upper part.
Preferably, the control unit is a PLC control unit.
Preferably, the water inlet pump, the water production pump, the air blower, the first sludge reflux pump, the first sludge discharge valve, the water production reflux valve, the second sludge reflux pump, the second sludge discharge valve, the first stirring device, the second stirring device, the third stirring device, the first aerator, the second aerator, the third aerator, the sludge pump, the sludge regulating valve and the system total sludge discharge valve are all connected with the control unit.
The technical scheme of the utility model following beneficial effect has:
1) the utility model discloses combine three kinds of processes of endogenous denitrification of denitrifying phosphorus removal series anaerobic ammonia oxidation coupling, can each technological advantage of full play, can gain higher nitrogen and phosphorus removal efficiency.
2) The utility model discloses can rationally solve the contradiction in aspects such as nitrogen removal and dephosphorization microorganism to nitrate influence phosphorus-accumulating bacteria anaerobism phosphorus release in organic matter, oxygen, sludge age and the backward flow mud, can realize that the high efficiency of nitrogen phosphorus is got rid of.
3) The utility model A2The denitrifying phosphorus accumulating bacteria in the O reaction tank are dominant strains, can fully utilize a carbon source in raw water, store intracellular carbon source substances to the maximum extent, and perform denitrifying phosphorus removal reaction by combining nitrate nitrogen generated by anaerobic ammonia oxidation, so that 'one-carbon dual-purpose' is realized, and the anaerobic ammonia oxidation nitrogen removal efficiency can be improved on the basis of phosphorus removal; the hydraulic retention time is short, the aerobic zone is short, and the aeration is savedAnd (4) energy consumption.
4) The utility model discloses a difficult mud come-up phenomenon that takes place of intermediate sedimentation tank, the inside difficult mud inflation phenomenon that appears of system, the operation is stable, goes out water effectually.
5) The shortcut nitrifying bacteria and anaerobic ammonium oxidation bacteria in the denitrification reaction tank of the utility model are dominant strains, autotrophic denitrification is carried out, no carbon source is needed, aeration energy consumption is saved, and sludge yield is low; aiming at the sewage with high total nitrogen load, the denitrification reaction area can be adjusted to be an anoxic condition, sludge rich in intracellular carbon source substances is input, endogenous denitrification is carried out to strengthen denitrification reaction, and the total nitrogen removal rate of the system is further improved.
6) The excess sludge amount of the utility model is less than that of the traditional activated sludge method, the capital construction cost of the tank volume and the structure is reduced, and the sludge disposal cost is reduced; the aeration energy consumption is low, carbon source substances and medicament cost are not needed, and the operation cost is saved; the total nitrogen removal rate is higher, and the difficulty and the cost are reduced for the subsequent treatment of the sewage; reduces the emission of greenhouse gases and is green and environment-friendly.
7) The utility model discloses economy environmental protection is the preferred nitrogen and phosphorus removal technology that handles low carbon-nitrogen ratio municipal sewage and high ammonia-nitrogen concentration mud digestive juice waste water, sewage treatment plant upgrade transformation and the new-built of sewage advanced treatment plant.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.
FIG. 1 shows a schematic diagram of a sewage treatment system with continuous flow denitrification dephosphorization, series anaerobic ammonia oxidation coupling and endogenous denitrification provided by the utility model.
The reference numerals are explained below:
1-a raw water pool; 2-A2An O reaction tank; 3-denitrification reaction tank; 4-a sludge storage tank; 1.1-water inlet pump;2.1-anaerobic zone; 2.2-anoxic zone; 2.3-aerobic zone; 2.4-a first stirring device; 2.5-a first aerator; 2.6-blower; 2.7-intermediate sedimentation tank; 2.8-a first sludge reflux pump; 2.9-first mud valve; 2.10-a second stirring device; 3.1-denitrification reaction zone; 3.2-MBR membrane module; 3.3-water pump production; 3.4-produced water reflux valve; 3.5-a second sludge reflux pump; 3.6-second mud valve; 3.7-a third stirring device; 3.8-a second aerator; 3.9-a third aerator; 4.1-sludge pump; 4.2-sludge regulating valve; 4.3-system main sludge discharge valve.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The utility model provides a continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupling endogenous denitrification's sewage treatment system that establishes ties, this system include raw water pond, A2The system comprises an O reaction tank, a denitrification reaction tank, a sludge storage tank and a control unit;
a is described2The O reaction tank comprises an anaerobic zone, an anoxic zone and an aerobic zone; the anaerobic zone, the anoxic zone and the aerobic zone are communicated through a partition plate with a through hole at the bottom or the upper part in sequence; the raw water pool is connected with the water inlet end of the anaerobic zone through a water inlet pump; the anaerobic zone and the anoxic zone are respectively provided with a first stirring device and a second stirring device; the aerobic zone is provided with a first aerator, a first online dissolved oxygen detector, an online COD detector and an online phosphate detector, the water outlet end of the aerobic zone is connected with an intermediate sedimentation tank, the intermediate sedimentation tank is respectively connected with the anaerobic zone and a first sludge discharge valve through a first sludge reflux pump, and the first sludge discharge valve is connected with the sludge storage tank;
the denitrification reaction tank comprises a plurality of denitrification reaction zones, and the former denitrification reaction zone is communicated with the latter denitrification reaction zone through a partition plate with a through hole at the bottom or the upper part; the water outlet end of the intermediate sedimentation tank is connected with the water inlet end of the first denitrification reaction zone; the first denitrification reaction zone is provided with a third stirring device and a second aerator; the other denitrification reaction areas are provided with third aerators; an MBR membrane module, a second online dissolved oxygen detector, an online ammonia nitrogen detector and an online nitrate nitrogen detector are also arranged in the last denitrification reaction zone; the MBR membrane component is connected with a water production pump, the water production pump is used for discharging the effluent of the denitrification reaction tank out of the system and/or refluxing the effluent to the anoxic zone through a water production reflux valve, the last denitrification reaction zone is respectively connected with the first denitrification reaction zone and a second sludge discharge valve through a second sludge reflux pump, and the second sludge discharge valve is connected with the sludge storage tank;
the sludge storage tank is also respectively connected with one end of the raw water tank and one end of a sludge pump, the other end of the sludge pump is provided with a sludge regulating valve and a system main sludge discharge valve, the sludge regulating valve is connected with the first denitrification reaction zone, and the system main sludge discharge valve is used for discharging system sludge out of the system;
the control unit is used for chain reaction control of the system.
In one example, the first aerator, the second aerator, and the third aerator are each connected to a blower.
In one example, the volume ratio of the anaerobic zone, the anoxic zone, and the aerobic zone is from 1:1 to 5:1 to 2.
In one example, the anoxic zone is plural.
In one example, the plurality of anoxic zones are communicated with each other through a partition plate with through holes at the bottom or the upper part.
The utility model discloses in, the volume ratio in anaerobic zone, anoxic zone and aerobic zone is the volume in anaerobic zone, the total volume in a plurality of anoxic zones and the volume ratio in aerobic zone.
In one example, the plurality of anoxic zones are each provided with a second stirring device.
In one example, a first anoxic zone of the plurality of anoxic zones communicates with the anaerobic zone through a bottom or upper perforated partition.
In one example, the last anoxic zone of the plurality of anoxic zones is communicated with the aerobic zone through a partition plate with through holes at the bottom or the upper part.
In one example, the control unit is a PLC control unit.
In one example, the water inlet pump, the water production pump, the air blower, the first sludge reflux pump, the first sludge discharge valve, the water production reflux valve, the second sludge reflux pump, the second sludge discharge valve, the first stirring device, the second stirring device, the third stirring device, the first aerator, the second aerator, the third aerator, the sludge pump, the sludge regulating valve and the system main sludge discharge valve are all connected with the control unit, and can be automatically regulated according to a set program.
The utility model discloses in, first online dissolved oxygen detector, online COD detector, online phosphate detector, the online dissolved oxygen detector of second, online ammonia nitrogen detector with online nitrate nitrogen detector is not shown yet.
The utility model also provides a method of the endogenous denitrification of continuous flow denitrification dephosphorization series connection anaerobic ammonia oxidation coupling handles low carbon nitrogen ratio municipal sewage, this method adopts the endogenous denitrification's of continuous flow denitrification dephosphorization series connection anaerobic ammonia oxidation coupling sewage treatment system, including following step:
s1: inoculating short-cut nitrification floc sludge and anaerobic ammonia oxidation floc sludge in the denitrification reaction tank, wherein A is2Inoculating sludge in a secondary sedimentation tank in an O reaction tank, and pumping the low-carbon-nitrogen-ratio urban sewage in the raw water tank to the A reaction tank2An O reaction tank; the low-carbon-nitrogen-ratio urban sewage enters the aerobic zone to be subjected to first aeration treatment; controlling the phosphate concentration of the effluent of the aerobic zone to be lower than a first threshold value;
s2: the effluent of the aerobic zone enters an intermediate sedimentation tank, part of precipitated sludge in the intermediate sedimentation tank flows back to the anaerobic zone, residual precipitated sludge in the intermediate sedimentation tank is discharged to a sludge storage tank, and secondary sedimentation tank sludge, the low-carbon-nitrogen-ratio municipal sewage and the precipitated sludge flowing back to the anaerobic zone are mixed to form a first mixed solution; the supernatant in the intermediate sedimentation tank enters the denitrification reaction tank;
s3: performing second aeration treatment on the supernatant, wherein the second sludge reflux pump reflows a part of sludge in the last denitrification reaction zone to the first denitrification reaction zone, and discharges the residual sludge in the denitrification reaction tank to the sludge storage tank; the water-producing pump reflows the effluent of the denitrification reaction tank to the anoxic zone and/or discharges the effluent out of the system; mixing the first mixed solution with effluent of a denitrification reaction tank which flows back to the anoxic zone to form a second mixed solution;
s4: the second mixed liquid enters the aerobic zone, and the steps S1-S3 are repeated;
controlling the concentration of nitrate nitrogen in the effluent of the denitrification reaction tank to be lower than a second threshold value; controlling the concentration of the ammonia nitrogen in the effluent of the denitrification reaction tank to be lower than a third threshold value;
s5: and the steps are sequentially and circularly carried out, and the supernatant of the sludge storage pool is refluxed to the raw water pool.
The utility model discloses in, low carbon nitrogen ratio municipal sewage is at first at A2Realizing a denitrification dephosphorization process in the O reaction tank, removing organic matters, phosphorus and nitrate nitrogen, storing internal carbon source substances in a microorganism body, and discharging residual sludge to a sludge storage tank; and (3) allowing the sewage only containing ammonia nitrogen to enter a subsequent denitrification reaction tank for carrying out shortcut nitrification-anaerobic ammonium oxidation reaction, and when the nitrogen load of the system is higher, simultaneously inputting microorganisms rich in internal carbon source substances in the sludge storage tank into the denitrification reaction tank for carrying out internal denitrification reaction to enhance denitrification.
In the utility model, the short-cut nitrification floc sludge is the short-cut nitrification floc sludge discharged by a high ammonia nitrogen wastewater treatment system which operates stably; the anaerobic ammonia oxidation floc sludge is cultured anaerobic ammonia oxidation floc sludge.
In one example, in step S1, the denitrification reaction tank sludge concentration is 6-10g/L, wherein the concentration of the shortcut nitrification floc sludge and the anaerobic ammonia oxidation floc sludge is 3-5 g/L; the sludge in the secondary sedimentation tank is the sludge returned from the secondary sedimentation tank of the municipal sewage treatment plant.
The utility model discloses in, will the low carbon nitrogen ratio municipal sewage in raw water pond passes through the intake pump is extremely A2And (4) an O reaction tank.
In one example, in step S2, the reflux ratio of settled sludge refluxed into the intermediate settling tank of the anaerobic zone is 50% to 200%; a is described2The sludge age of the O reaction tank sludge is 4-15d, and the residual precipitated sludge in the intermediate precipitation tank is discharged to the sludge storage tank; a is described2The sludge concentration in the first mixed liquid in the O reaction tank is 6-10 g/L.
The utility model discloses in, the backward flow extremely anaerobic zone the backward flow ratio of the sediment mud in the intermediate sedimentation tank is for flowing back extremely anaerobic zone the volume of the sediment mud in the intermediate sedimentation tank with get into A2The ratio of low carbon nitrogen to the water amount of the municipal sewage in the O reaction tank. The secondary sedimentation tank sludge, the low-carbon-nitrogen-ratio municipal sewage and the sedimentation sludge which flows back to the anaerobic zone are mixed in the anaerobic zone, and are uniformly stirred by a first stirring device to form a first mixed solution.
In one example, in step S1, the first threshold is 0.35-0.45 mg/L; the step of controlling the phosphate concentration of the effluent of the aerobic zone to be lower than a first threshold comprises adjusting the first sludge recirculation pump by the control unit, increasing the recirculation ratio of the settled sludge in the intermediate settling tank recirculating to the anaerobic zone, adjusting the first sludge discharge valve, shortening the A2And (3) increasing the sludge age of the sludge in the O reaction tank, increasing the sludge amount discharged from the residual precipitated sludge in the intermediate precipitation tank to the sludge storage tank until the detected phosphate concentration is less than 0.35-0.45mg/L, and restoring and adjusting the first sludge reflux pump and the first sludge discharge valve to an initial state.
In one example, in step S3, the reflux ratio of the denitrification sludge refluxed to the last denitrification reaction zone of the first denitrification reaction zone is 100% to 300%; the sludge age of the denitrification reaction tank is 60-100d, and the residual sludge of the denitrification reaction tank is discharged to the sludge storage tank; the water production reflux ratio of the effluent which flows back to the denitrification reaction tank of the anoxic zone is 0-300%.
The utility model discloses in, the backward flow extremely the backward flow ratio of the denitrogenation mud of the last denitrogenation reaction zone in first denitrogenation reaction zone is for flowing back extremely the volume of the denitrogenation mud of the last denitrogenation reaction zone in first denitrogenation reaction zone with get into A2The ratio of low carbon nitrogen to the water amount of the municipal sewage in the O reaction tank.
The utility model discloses in, the backward flow extremely anoxic zone the produced water reflux ratio of the play water of denitrification reaction tank is the backward flow extremely anoxic zone the play water yield of denitrification reaction tank with get into A2The ratio of low carbon nitrogen to the water amount of the municipal sewage in the O reaction tank.
The utility model discloses in, will first mixed liquid with flow back extremely the denitrogenation reaction tank play water of anoxic zone mixes in the anoxic zone, forms the mixed liquid of second by second agitating unit stirring. And the effluent of the denitrification reaction tank which flows back to the anoxic zone is nitrate nitrogen-containing solution.
In one example, in step S4, the second threshold is 4.5-5.5 mg/L; controlling the nitrate nitrogen concentration of the effluent of the denitrification reaction tank to be lower than a second threshold value comprises the steps of utilizing the control unit to open the sludge regulating valve, pumping the stored sludge of the sludge storage tank into the first denitrification reaction zone, closing the second aerator, opening a third stirring device, adjusting the produced water reflux valve, increasing the reflux ratio of the effluent of the denitrification reaction tank which is refluxed to the anoxic zone until the nitrate nitrogen concentration is detected to be lower than 4.5-5.5mg/L, recovering the normal operation, closing the sludge regulating valve, opening the second aerator, closing the third stirring device, adjusting the produced water reflux valve, and reducing the reflux ratio of the effluent of the denitrification reaction tank which is refluxed to the anoxic zone; preferably, the amount of the sludge stored in the sludge storage tank and pumped into the first denitrification reaction zone is set according to the hydraulic retention time of 1-3h under the anoxic condition of the first denitrification reaction zone;
the third threshold value is 4-5 mg/L; the step of controlling the ammonia nitrogen concentration of the effluent of the denitrification reaction tank to be lower than a third threshold value comprises the steps of adjusting the second sludge reflux pump by using the control unit, increasing the reflux ratio of the denitrification sludge refluxed to the last denitrification reaction zone of the first denitrification reaction zone, increasing the aeration amount until the ammonia nitrogen concentration is detected to be less than 4-5mg/L, and restoring and adjusting the second sludge reflux pump and the air blower to the initial state.
In one example, the carbon-nitrogen ratio of the low-carbon-nitrogen-ratio municipal sewage is 0.8-4.5, and the ammonia nitrogen concentration is 35-65 mg/L.
In one example, the A2The dissolved oxygen concentration of the aerobic zone of the O reaction tank is 1-4 mg/L; a is described2The hydraulic retention time of the O reaction tank is 1-8 h.
In one example, the dissolved oxygen concentration of the denitrification reaction tank is 0.1-2 mg/L; the hydraulic retention time of the denitrification reaction tank is 7-12 h.
In one example, the hydraulic retention time of the sludge storage tank is 2-5 h.
In the utility model, the dissolved oxygen concentration of the MBR membrane module is 1.4-1.6 mg/L.
The utility model also provides a method of the endogenous denitrification of continuous flow denitrification dephosphorization series connection anaerobic ammonia oxidation coupling handles the sludge digestion liquid of low carbon-nitrogen ratio, this method adopts the endogenous denitrification's of continuous flow denitrification dephosphorization series connection anaerobic ammonia oxidation coupling sewage treatment system, including following step:
s1: inoculating short-cut nitrification floc sludge and anaerobic ammonia oxidation floc sludge in the denitrification reaction tank, wherein A is2Inoculating sludge in a secondary sedimentation tank in an O reaction tank, and pumping low-carbon-nitrogen-ratio sludge digestive juice in the raw water tank to the A2An O reaction tank; the sludge digestive fluid with low carbon-nitrogen ratio enters the aerobic zone to carry out first aeration treatment; controlling the phosphate concentration of the effluent of the aerobic zone to be lower than a first threshold value;
s2: the effluent of the aerobic zone enters an intermediate sedimentation tank, part of precipitated sludge in the intermediate sedimentation tank flows back to the anaerobic zone, residual precipitated sludge in the intermediate sedimentation tank is discharged to a sludge storage tank, and secondary sedimentation tank sludge, the low-carbon-nitrogen-ratio sludge digestive fluid and the precipitated sludge flowing back to the anaerobic zone are mixed to form a first mixed solution; the supernatant in the intermediate sedimentation tank enters the denitrification reaction tank;
s3: performing second aeration treatment on the supernatant, wherein the second sludge reflux pump reflows a part of sludge in the last denitrification reaction zone to the first denitrification reaction zone, and discharges the residual sludge in the denitrification reaction tank to the sludge storage tank; the water-producing pump reflows the effluent of the denitrification reaction tank to the anoxic zone and/or discharges the effluent out of the system; mixing the first mixed solution with effluent of a denitrification reaction tank which flows back to the anoxic zone to form a second mixed solution;
s4: the second mixed liquid enters the aerobic zone, and the steps S1-S3 are repeated;
controlling the concentration of nitrate nitrogen in the effluent of the denitrification reaction tank to be lower than a second threshold value; controlling the concentration of the ammonia nitrogen in the effluent of the denitrification reaction tank to be lower than a third threshold value;
s5: and the steps are sequentially and circularly carried out, and the supernatant of the sludge storage pool is refluxed to the raw water pool.
The utility model discloses in, the sludge digestion liquid of low carbon-nitrogen ratio is at first at A2Realizing a denitrification dephosphorization process in the O reaction tank, removing organic matters, phosphorus and nitrate nitrogen, storing internal carbon source substances in a microorganism body, and discharging residual sludge to a sludge storage tank; and (3) allowing the sewage only containing ammonia nitrogen to enter a subsequent denitrification reaction tank for carrying out shortcut nitrification-anaerobic ammonium oxidation reaction, and when the nitrogen load of the system is higher, simultaneously inputting microorganisms rich in internal carbon source substances in the sludge storage tank into the denitrification reaction tank for carrying out internal denitrification reaction to enhance denitrification.
In one example, in step S1, the denitrification reaction tank sludge concentration is 6-10g/L, wherein the concentration of the shortcut nitrification floc sludge and the anaerobic ammonia oxidation floc sludge is 3-5 g/L; the sludge in the secondary sedimentation tank is the sludge returned from the secondary sedimentation tank of the municipal sewage treatment plant.
The utility model discloses in, will the low carbon nitrogen ratio sludge digestion liquid in raw water pond passes throughThe water inlet pump is pumped to the A2And (4) an O reaction tank.
In one example, in step S2, the reflux ratio of settled sludge refluxed into the intermediate settling tank of the anaerobic zone is 50% to 200%; a is described2The sludge age of the O reaction tank sludge is 4-15d, and the residual precipitated sludge in the intermediate precipitation tank is discharged to the sludge storage tank; a is described2The sludge concentration in the first mixed liquid in the O reaction tank is 6-10 g/L.
The utility model discloses in, the backward flow extremely anaerobic zone the backward flow ratio of the sediment mud in the intermediate sedimentation tank is for flowing back extremely anaerobic zone the volume of the sediment mud in the intermediate sedimentation tank with get into A2The ratio of the low carbon nitrogen to the water amount of the sludge digestion liquid in the O reaction tank. And the sludge in the secondary sedimentation tank, the sludge digestion liquid and the precipitated sludge which flows back to the anaerobic zone are mixed in the anaerobic zone, and are uniformly stirred by a first stirring device to form a first mixed solution.
In one example, in step S1, the first threshold is 0.35-0.45 mg/L; the step of controlling the phosphate concentration of the effluent of the aerobic zone to be lower than a first threshold comprises adjusting the first sludge recirculation pump by the control unit, increasing the recirculation ratio of the settled sludge in the intermediate settling tank recirculating to the anaerobic zone, adjusting the first sludge discharge valve, shortening the A2And (3) increasing the sludge age of the sludge in the O reaction tank, increasing the sludge amount discharged from the residual precipitated sludge in the intermediate precipitation tank to the sludge storage tank until the detected phosphate concentration is less than 0.35-0.45mg/L, and restoring and adjusting the first sludge reflux pump and the first sludge discharge valve to an initial state.
In one example, in step S3, the reflux ratio of the denitrification sludge refluxed to the last denitrification reaction zone of the first denitrification reaction zone is 100% to 300%; the sludge age of the denitrification reaction tank is 60-100d, and the residual sludge is discharged to the sludge storage tank; the water production reflux ratio of the effluent which flows back to the denitrification reaction tank of the anoxic zone is 0-300%.
In the utility model, the flow returns to the last denitrification reaction area of the first denitrification reaction areaThe reflux ratio of the denitrified sludge is the amount of the denitrified sludge which is refluxed to the last denitrification reaction zone of the first denitrification reaction zone and enters the A2The water amount of the sludge digestion liquid in the O reaction tank.
The utility model discloses in, the backward flow extremely anoxic zone the produced water reflux ratio of the play water of denitrification reaction tank is the backward flow extremely anoxic zone the play water yield of denitrification reaction tank with get into A2The ratio of the low carbon nitrogen to the water amount of the sludge digestion liquid in the O reaction tank.
The utility model discloses in, will first mixed liquid with flow back extremely the denitrogenation reaction tank play water of anoxic zone mixes in the anoxic zone, forms the mixed liquid of second by second agitating unit stirring. And the effluent of the denitrification reaction tank which flows back to the anoxic zone is nitrate nitrogen-containing solution.
In one example, in step S4, the second threshold is 95-105 mg/L; controlling the nitrate nitrogen concentration of the effluent of the denitrification reaction tank to be lower than a second threshold value comprises the steps of utilizing the control unit to open the sludge regulating valve, pumping the stored sludge of the sludge storage tank into the first denitrification reaction zone, closing the second aerator, opening a third stirring device, adjusting the produced water reflux valve, increasing the reflux ratio of the effluent of the denitrification reaction tank which flows back to the anoxic zone until the nitrate nitrogen concentration is detected to be lower than 95-105mg/L, recovering the normal operation, closing the sludge regulating valve, opening the second aerator, closing the third stirring device, adjusting the produced water reflux valve, and reducing the reflux ratio of the effluent of the denitrification reaction tank which flows back to the anoxic zone; preferably, the amount of the sludge stored in the sludge storage tank and pumped into the first denitrification reaction zone is set according to the hydraulic retention time of 1-4d under the anoxic condition of the first denitrification reaction zone;
the third threshold value is 45-55 mg/L; the step of controlling the ammonia nitrogen concentration of the effluent of the denitrification reaction tank to be lower than a third threshold value comprises the steps of adjusting the second sludge reflux pump by using the control unit, increasing the reflux ratio of the denitrification sludge refluxed to the last denitrification reaction zone of the first denitrification reaction zone, increasing the aeration amount until the ammonia nitrogen concentration is detected to be lower than 45-55mg/L, and restoring and adjusting the second sludge reflux pump and the air blower to be in an initial state.
In one example, the carbon-nitrogen ratio of the sludge digestion solution with low carbon-nitrogen ratio is 0.8-1.5, and the ammonia nitrogen concentration is 2-2.5 g/L.
In one example, the A2The dissolved oxygen concentration of the aerobic zone of the O reaction tank is 1-4 mg/L; a is described2The hydraulic retention time of the O reaction tank is 1-8 h.
In one example, the dissolved oxygen concentration of the denitrification reaction tank is 0.1-2 mg/L; the hydraulic retention time of the denitrification reaction tank is 1-3 d.
In one example, the hydraulic retention time of the sludge storage tank is 1-3 d.
In the utility model, the dissolved oxygen concentration of the effluent of the MBR membrane module is 1.4-1.6 mg/L.
The present invention will be described in detail with reference to examples.
Example 1
This example provides a continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system, as shown in fig. 1, the system includes a raw water pool 1, a2An O reaction tank 2, a denitrification reaction tank 3, a sludge storage tank 4 and a PLC control unit;
a is described2The O reaction tank comprises an anaerobic zone 2.1, an anoxic zone 2.2 and an aerobic zone 2.3, and the volume ratio of the anaerobic zone 2.1 to the anoxic zone 2.2 to the aerobic zone 2.3 is 1:1: 1; the anaerobic zone 2.1, the anoxic zone 2.2 and the aerobic zone 2.3 are communicated through a partition plate with a through hole at the bottom or the upper part in sequence; the raw water pool 1 is connected with the water inlet end of the anaerobic zone 2.1 through a water inlet pump 1.1; the anaerobic zone 2.1 and the anoxic zone 2.2 are respectively provided with a first stirring device 2.4 and a second stirring device 2.10; the aerobic zone 2.3 is provided with a first aerator 2.5, a first online dissolved oxygen detector, an online COD detector and an online phosphate detector, the water outlet end of the aerobic zone 2.3 is connected with an intermediate sedimentation tank 2.7, the intermediate sedimentation tank 2.7 is respectively connected with the anaerobic zone 2.1 and a first sludge discharge valve 2.9 through a first sludge reflux pump 2.8, and the first sludge discharge valve 2.9 is connected with the sludge storage tank 4;
the denitrification reaction tank 3 comprises a plurality of denitrification reaction zones 3.1, and the former denitrification reaction zone 3.1 is communicated with the latter denitrification reaction zone 3.1 through a partition plate with a through hole at the bottom or the upper part; the water outlet end of the intermediate sedimentation tank 2.7 is connected with the water inlet end of the first denitrification reaction zone 3.1; the first denitrification reaction zone 3.1 is provided with a third stirring device 3.7 and a second aerator 3.8; the other denitrification reaction zones 3.1 are provided with third aerators 3.9; an MBR membrane component 3.2, a second online dissolved oxygen detector, an online ammonia nitrogen detector and an online nitrate nitrogen detector are also arranged in the last denitrification reaction zone 3.1; a water production pump 3.3 is connected to the MBR membrane module 3.2, the water production pump 3.3 is used for discharging the effluent of the denitrification reaction tank 3 out of the system and/or refluxing the effluent to the anoxic zone 2.2 through a water production reflux valve 3.4, the last denitrification reaction zone 3.1 is respectively connected with the first denitrification reaction zone 3.1 and a second sludge discharge valve 3.6 through a second sludge reflux pump 3.5, and the second sludge discharge valve 3.6 is connected with the sludge storage tank 4;
the sludge storage tank 4 is also respectively connected with one end of the raw water tank 1 and one end of a sludge pump 4.1, the other end of the sludge pump 4.1 is provided with a sludge regulating valve 4.2 and a system main sludge discharge valve 4.3, the sludge regulating valve 4.2 is connected with the first denitrification reaction zone 3.1, and the system main sludge discharge valve 4.3 is used for discharging system sludge out of the system;
the PLC control unit is used for controlling the chain reaction of the system.
Wherein the first aerator 2.5, the second aerator 3.8 and the third aerator 3.9 are all connected to a blower 2.6; the number of the anoxic zones 2.2 is 2, and the 2 anoxic zones 2.2 are communicated through a partition plate with a through hole at the bottom or the upper part; the 2 anoxic zones 2.2 are provided with second stirring devices 2.10; the first anoxic zone of 2 anoxic zones 2.2 is communicated with the anaerobic zone 2.1 through a partition plate with a through hole at the bottom or the upper part, and the second anoxic zone of 2 anoxic zones 2.2 is communicated with the aerobic zone 2.3 through a partition plate with a through hole at the bottom or the upper part.
The water inlet pump 1.1, the water production pump 3.3, the air blower 2.6, the first sludge reflux pump 2.8, the first sludge discharge valve 2.9, the water production reflux valve 3.4, the second sludge reflux pump 3.5, the second sludge discharge valve 3.6, the first stirring device 2.4, the second stirring device 2.10, the third stirring device 3.7, the first aerator 2.5, the second aerator 3.8, the third aerator 3.9, the sludge pump 4.1, the sludge regulating valve 4.2 and the system total sludge discharge valve 4.3 are all connected with the control unit and can be automatically controlled and adjusted according to a set program.
Example 2
This example provides a continuous flow denitrification dephosphorization tandem anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system, as shown in fig. 1, the system only differs from example 1 in that the volume ratio of the anaerobic zone 2.1, the anoxic zone 2.2 and the aerobic zone 2.3 is 1:5:2, and the other settings are the same as example 1.
Example 3
The embodiment provides a method for treating low-carbon-nitrogen-ratio urban sewage by continuous flow denitrification dephosphorization and series anaerobic ammonia oxidation coupling endogenous denitrification, wherein the water quality of the low-carbon-nitrogen-ratio urban sewage is characterized in that: 70-300mg/L of COD, 30-60mg/L of TN, and NH4 +27-60mg/L of N, 3-7mg/L of TP and 1.1-4.5 of C/N (average value is 2.3), the method adopts the sewage treatment system with continuous flow denitrification dephosphorization, serial anaerobic ammonia oxidation and endogenous denitrification coupled as described in the example 1, as shown in figure 1, and comprises the following steps:
s1: inoculating 3-4g/L of short-cut nitrification floc sludge and 3-4g/L of anaerobic ammonia oxidation floc sludge into the denitrification reaction tank, wherein A is2Inoculating sludge in a secondary sedimentation tank in an O reaction tank 2, and pumping the low-carbon-nitrogen-ratio urban sewage in the raw water tank to the A reaction tank2An O reaction tank 2; the low-carbon-nitrogen-ratio urban sewage enters the aerobic zone for 2.3, and is subjected to first aeration treatment; and controlling the phosphate concentration of the effluent of the aerobic zone 2.3 to be lower than a first threshold value of 0.4 mg/L.
S2: the effluent water of the aerobic zone 2.3 enters the intermediate sedimentation tank 2.7, a part of the precipitated sludge in the intermediate sedimentation tank 2.7 flows back to the anaerobic zone 2.1, and A2The sludge age of the O reaction tank sludge is 12 days, and the residual precipitated sludge in the intermediate sedimentation tank 2.7Discharging to the sludge storage tank 4, and mixing the secondary sedimentation tank sludge, the low carbon-nitrogen ratio municipal sewage and the precipitated sludge which flows back to the anaerobic zone 2.1 to form a first mixed solution; the supernatant in the intermediate sedimentation tank 2.7 enters the denitrification reaction tank 3;
wherein the reflux ratio of the settled sludge refluxed into the intermediate settling tank 2.7 of the anaerobic zone 2.1 is 100%; the sludge concentration in the first mixed solution is maintained at 4-5 g/L; the step of controlling the phosphate concentration of the effluent from the aerobic zone 2.3 to be lower than the first threshold value of 0.4mg/L of the above step S1 comprises adjusting the first sludge recirculation pump 2.8 by the control unit to increase the recirculation ratio of the settled sludge in the intermediate settling tank 2.7 recirculating to the anaerobic zone 2.1; adjusting the first mud valve 2.9 to shorten A2And the sludge age of the sludge in the O reaction tank is increased, and the sludge amount of the residual precipitated sludge in the intermediate sedimentation tank 2.7 discharged to the sludge storage tank 4 is increased.
S3: performing second aeration treatment on the supernatant, wherein a part of sludge in the last denitrification reaction zone 3.1 is refluxed to the first denitrification reaction zone 3.1 by a second sludge reflux pump 3.5, the sludge age of the denitrification reaction tank is 100 days, and the residual sludge in the denitrification reaction tank 3 is discharged to the sludge storage tank 4; the water producing pump 3.3 reflows the effluent of the denitrification reaction tank 3 to the anoxic zone 2.2 and/or discharges the effluent out of the system; mixing the first mixed solution with effluent of a denitrification reaction tank 3 which flows back to the anoxic zone 2.2 to form a second mixed solution; wherein the reflux ratio of the denitrified sludge refluxed to the last denitrification reaction zone 3.1 of the first denitrification reaction zone 3.1 is 100 percent; the sludge concentration in the denitrification reaction tank 3 is maintained at 6-8 g/L; the water production reflux ratio of the effluent which flows back to the denitrification reaction tank 3 of the anoxic zone 2.2 is 50 percent.
S4: the second mixed liquid enters the aerobic zone 2.3, and the steps S1-S3 are repeated;
controlling the nitrate nitrogen concentration of the effluent of the denitrification reaction tank 3 to be lower than a second threshold value of 5 mg/L; controlling the concentration of the ammonia nitrogen in the effluent of the denitrification reaction tank 3 to be lower than a third threshold value of 4.5 mg/L;
the step of controlling the nitrate nitrogen concentration of the effluent of the denitrification reaction tank 3 to be lower than a second threshold value comprises the steps of utilizing the control unit to open the sludge regulating valve 4.2, pumping the stored sludge of the sludge storage tank 4 into the first denitrification reaction zone 3.1, closing the second aerator 3.8, opening a third stirring device 3.7, regulating the water production reflux valve 3.4 and increasing the reflux ratio of the effluent of the denitrification reaction tank 3 which is refluxed to the anoxic zone 2.2; wherein the amount of the sludge stored in the sludge storage tank 4 pumped into the first denitrification reaction zone 3.1 is set according to the hydraulic retention time of 2h under the anoxic condition of the first denitrification reaction zone 3.1; the step of controlling the ammonia nitrogen concentration of the effluent of the denitrification reaction tank 3 to be lower than a third threshold value comprises the steps of adjusting the second sludge reflux pump 3.5 by using the control unit, increasing the reflux ratio of the denitrification sludge refluxed to the last denitrification reaction zone 3.1 of the first denitrification reaction zone 3.1 and increasing the aeration amount.
S5: and the steps are sequentially and circularly carried out, and the supernatant of the sludge storage tank 4 is refluxed to the raw water tank.
Wherein the ammonia nitrogen concentration of the municipal sewage with the low carbon-nitrogen ratio is 35-65 mg/L;
a is described2The dissolved oxygen concentration of an aerobic zone 2.3 of the O reaction tank 2 is 1-2.5 mg/L; a is described2The hydraulic retention time of the O reaction tank 2 is 3 h;
the concentration of dissolved oxygen in the denitrification reaction tank 3 is 0.1-0.3 mg/L; the hydraulic retention time of the denitrification reaction tank 3 is 7 hours;
the hydraulic retention time of the sludge storage tank 4 is 2 hours.
The concentration of dissolved oxygen at the effluent of the MBR membrane module is 1.5 mg/L.
The throughput Q in this example was 5L/h.
The effluent of the denitrification reaction tank 3 which is discharged from the system through the water production pump 3.3 has the following water quality characteristics: COD is less than 50mg/L, NH4 +N is within 5mg/L, TN is within 12mg/L, and TP is within 0.5 mg/L.
Example 4
This example provides a continuous flow denitrification dephosphorization tandem anammox couplingThe method for treating the sludge digestive liquid with low carbon-nitrogen ratio by source denitrification comprises the following steps: COD 2-3.3g/L, TN 2-2.5g/L, NH4 +2-2.5g/L of N, 3-20mg/L of TP and 0.8-1.4 of C/N (average value is 1.1), the method adopts the sewage treatment system with continuous flow denitrification dephosphorization, serial anaerobic ammonia oxidation and endogenous denitrification coupled as described in example 2, and as shown in figure 1, the method comprises the following steps:
s1: 4-5g/L of short-cut nitrification floc sludge and 4-5g/L of anaerobic ammonia oxidation floc sludge are inoculated in the denitrification reaction tank 3, and A is2Inoculating sludge in a secondary sedimentation tank into an O reaction tank 2, and pumping the sludge digestive juice with low carbon-nitrogen ratio in the raw water tank 1 to the A2An O reaction tank 2; the sludge digestive fluid with low carbon-nitrogen ratio enters the aerobic zone for 2.3, and first aeration treatment is carried out; and controlling the phosphate concentration of the effluent of the aerobic zone 2.3 to be lower than a first threshold value of 0.4 mg/L.
S2: the effluent water of the aerobic zone 2.3 enters the intermediate sedimentation tank 2.7, a part of the precipitated sludge in the intermediate sedimentation tank 2.7 flows back to the anaerobic zone 2.1, and A2The sludge age of the sludge in the O reaction tank is 10 days, the residual precipitated sludge in the intermediate sedimentation tank 2.7 is discharged to the sludge storage tank 4, and the sludge in the secondary sedimentation tank, the sludge digestive juice with low carbon-nitrogen ratio and the precipitated sludge which flows back to the anaerobic zone 2.1 are mixed to form a first mixed solution; the supernatant in the intermediate sedimentation tank 2.7 enters the denitrification reaction tank 3;
wherein the reflux ratio of the settled sludge refluxed into the intermediate settling tank 2.7 of the anaerobic zone 2.1 is 100%; the sludge concentration in the first mixed solution is maintained at 8-10 g/L; the step of controlling the phosphate concentration of the effluent from the aerobic zone 2.3 to be lower than the first threshold value of 0.4mg/L in step S1 comprises adjusting the first sludge recirculation pump 2.8 by the control unit to increase the recirculation ratio of the settled sludge in the intermediate settling tank 2.7 recirculating to the anaerobic zone 2.1; adjusting the first mud valve 2.9 to shorten A2And the sludge age of the sludge in the O reaction tank is increased, and the sludge amount of the residual precipitated sludge in the intermediate sedimentation tank 2.7 discharged to the sludge storage tank 4 is increased.
S3: performing second aeration treatment on the supernatant, wherein a part of sludge in the last denitrification reaction zone 3.1 is refluxed to the first denitrification reaction zone 3.1 by a second sludge reflux pump 3.5, the sludge age of the denitrification reaction tank is 100 days, and the residual sludge in the denitrification reaction tank 3 is discharged to the sludge storage tank 4; the water producing pump 3.3 reflows the effluent of the denitrification reaction tank 3 to the anoxic zone 2.2 and/or discharges the effluent out of the system; mixing the first mixed solution with effluent of a denitrification reaction tank 3 which flows back to the anoxic zone 2.2 to form a second mixed solution; wherein the reflux ratio of the denitrified sludge refluxed to the last denitrification reaction zone 3.1 of the first denitrification reaction zone 3.1 is 100 percent; the sludge concentration in the denitrification reaction tank 3 is maintained at 8-10 g/L; the water production reflux ratio of the effluent which flows back to the denitrification reaction tank 3 of the anoxic zone 2.2 is 300 percent.
S4: the second mixed liquid enters the aerobic zone 2.3, and the steps S1-S3 are repeated;
controlling the nitrate nitrogen concentration of the effluent of the denitrification reaction tank 3 to be lower than a second threshold value of 100 mg/L; controlling the concentration of the ammonia nitrogen in the effluent of the denitrification reaction tank 3 to be lower than a third threshold value of 50 mg/L;
the step of controlling the nitrate nitrogen concentration of the effluent of the denitrification reaction tank 3 to be lower than a second threshold value comprises the steps of utilizing the control unit to open the sludge regulating valve 4.2, pumping the stored sludge of the sludge storage tank 4 into the first denitrification reaction zone 3.1, closing the second aerator 3.8, opening a third stirring device 3.7, regulating the water production reflux valve 3.4 and increasing the reflux ratio of the effluent of the denitrification reaction tank 3 which is refluxed to the anoxic zone 2.2; wherein the amount of the sludge stored in the sludge storage tank 4 pumped into the first denitrification reaction zone 3.1 is set according to the hydraulic retention time of 3h under the anoxic condition of the first denitrification reaction zone 3.1; the step of controlling the ammonia nitrogen concentration of the effluent of the denitrification reaction tank 3 to be lower than the third threshold value comprises the steps of adjusting the second sludge reflux pump 3.5 by using the control unit, increasing the reflux ratio of the denitrification sludge refluxed to the last denitrification reaction zone.1 of the first denitrification reaction zone 3.1 and increasing the aeration amount.
S5: and the steps are sequentially and circularly carried out, and the supernatant of the sludge storage tank 4 is refluxed to the raw water tank 1.
Wherein the ammonia nitrogen concentration of the sludge digestion solution is 2-2.5 g/L;
a is described2The dissolved oxygen concentration of an aerobic zone 2.3 of the O reaction tank 2 is 2.5-3.5 mg/L; a is described2The hydraulic retention time of the O reaction tank 2 is 8 h;
the concentration of dissolved oxygen in the denitrification reaction tank 3 is 0.1-0.3 mg/L; the hydraulic retention time of the denitrification reaction tank 3 is 48 hours;
the hydraulic retention time of the sludge storage tank 4 is 2 d.
The concentration of dissolved oxygen at the effluent of the MBR membrane module is 1.5 mg/L.
The throughput Q in this example was 1L/h.
The effluent of the denitrification reaction tank 3 which is discharged from the system through the water production pump 3.3 has the following water quality characteristics: COD is less than 50mg/L, NH4 +N is within 50mg/L, TN is within 150mg/L, and TP is within 0.5 mg/L.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (10)

1. A sewage treatment system with continuous flow denitrification dephosphorization, series anaerobic ammonia oxidation coupling and endogenous denitrification is characterized by comprising a raw water pool A2The system comprises an O reaction tank, a denitrification reaction tank, a sludge storage tank and a control unit;
a is described2The O reaction tank comprises an anaerobic zone, an anoxic zone and an aerobic zone; the anaerobic zone, the anoxic zone and the aerobic zone are communicated through a partition plate with a through hole at the bottom or the upper part in sequence; the raw water pool is connected with the water inlet end of the anaerobic zone through a water inlet pump; the anaerobic zone and the anoxic zone are respectively provided with a first stirring device and a second stirring device; the aerobic zone is provided with a first aerator, a first aeratorThe system comprises an online dissolved oxygen detector, an online COD detector and an online phosphate detector, wherein the water outlet end of an aerobic zone is connected with an intermediate sedimentation tank, the intermediate sedimentation tank is respectively connected with an anaerobic zone and a first sludge discharge valve through a first sludge reflux pump, and the first sludge discharge valve is connected with a sludge storage tank;
the denitrification reaction tank comprises a plurality of denitrification reaction zones, and the former denitrification reaction zone is communicated with the latter denitrification reaction zone through a partition plate with a through hole at the bottom or the upper part; the water outlet end of the intermediate sedimentation tank is connected with the water inlet end of the first denitrification reaction zone; the first denitrification reaction zone is provided with a third stirring device and a second aerator; the other denitrification reaction areas are provided with third aerators; an MBR membrane module, a second online dissolved oxygen detector, an online ammonia nitrogen detector and an online nitrate nitrogen detector are also arranged in the last denitrification reaction zone; the MBR membrane component is connected with a water production pump, the water production pump is used for discharging the effluent of the denitrification reaction tank out of the system and/or refluxing the effluent to the anoxic zone through a water production reflux valve, the last denitrification reaction zone is respectively connected with the first denitrification reaction zone and a second sludge discharge valve through a second sludge reflux pump, and the second sludge discharge valve is connected with the sludge storage tank;
the sludge storage tank is also respectively connected with one end of the raw water tank and one end of a sludge pump, the other end of the sludge pump is provided with a sludge regulating valve and a system main sludge discharge valve, the sludge regulating valve is connected with the first denitrification reaction zone, and the system main sludge discharge valve is used for discharging system sludge out of the system;
the control unit is used for chain reaction control of the system.
2. The continuous-flow denitrification dephosphorization series-anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 1, wherein the first aerator, the second aerator and the third aerator are all connected to a blower.
3. The continuous flow denitrification dephosphorization serial anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 1, wherein the volume ratio of the anaerobic zone, the anoxic zone and the aerobic zone is 1:1-5: 1-2.
4. The continuous-flow denitrification dephosphorization series-anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 1, wherein the anoxic zone is a plurality of anoxic zones.
5. The continuous flow denitrification dephosphorization serial anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 1, wherein a plurality of anoxic zones are communicated with each other through a partition plate with through holes at the bottom or the upper part.
6. The continuous-flow denitrification dephosphorization series-connection anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 1, wherein the plurality of anoxic zones are provided with a second stirring device.
7. The continuous-flow denitrification dephosphorization series anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 1, wherein a first anoxic zone of the plurality of anoxic zones is communicated with the anaerobic zone through a partition plate with through holes at the bottom or the upper part.
8. The continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 1, wherein the last anoxic zone of the plurality of anoxic zones is communicated with the aerobic zone through a partition plate with through holes at the bottom or the upper part.
9. The continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 1, wherein the control unit is a PLC control unit.
10. The continuous flow denitrification dephosphorization series anaerobic ammonia oxidation coupled endogenous denitrification sewage treatment system according to claim 2, wherein the water inlet pump, the water production pump, the air blower, the first sludge reflux pump, the first sludge discharge valve, the water production reflux valve, the second sludge reflux pump, the second sludge discharge valve, the first stirring device, the second stirring device, the third stirring device, the first aerator, the second aerator, the third aerator, the sludge pump, the sludge regulating valve and the system total sludge discharge valve are all connected with the control unit.
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