CN108409033B - Device and method for advanced nitrogen and phosphorus removal of segmented water inlet UCT by FNA (nitrogen rich aeration) enhanced short-cut nitrification - Google Patents

Device and method for advanced nitrogen and phosphorus removal of segmented water inlet UCT by FNA (nitrogen rich aeration) enhanced short-cut nitrification Download PDF

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CN108409033B
CN108409033B CN201810203306.5A CN201810203306A CN108409033B CN 108409033 B CN108409033 B CN 108409033B CN 201810203306 A CN201810203306 A CN 201810203306A CN 108409033 B CN108409033 B CN 108409033B
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彭永臻
王增花
王博
宫小斐
乔昕
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Beijing University of Technology
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Abstract

An FNA reinforced shortcut nitrification subsection water inlet UCT deep nitrogen and phosphorus removal device and a method thereof belong to the field of sewage treatment. The apparatus has: raw water tank, bioreactor, secondary sedimentation tank and sludge treatment reactor. The method comprises the following steps: domestic sewage enters an anaerobic zone and an anoxic zone of the bioreactor in sections, the anaerobic zone carries out anaerobic phosphorus release and stores an internal carbon source, denitrifying bacteria in the first anoxic zone reduce backflow nitrite nitrogen into nitrogen by using the internal carbon source, and anoxic denitrification dephosphorization is carried out at the same time. Then the sewage enters an aerobic zone, ammonia oxidizing bacteria oxidize ammonia nitrogen into nitrite nitrogen, and the sewage enters a second anoxic zone to be subjected to denitrification by utilizing a carbon source in second strand water. Controlling the sludge age by regularly discharging excess sludge, treating partial returned sludge by using Free Nitrous Acid (FNA) and then returning the treated partial returned sludge to the bioreactor; the method realizes short-cut nitrification by using FNA to inhibit nitrite oxidizing bacteria far more than ammonia oxidizing bacteria, and maintains stable short-cut by alternate anoxic and aerobic intermittent aeration to realize continuous flow deep denitrification and dephosphorization of municipal sewage.

Description

Device and method for advanced nitrogen and phosphorus removal of segmented water inlet UCT by FNA (nitrogen rich aeration) enhanced short-cut nitrification
Technical Field
The invention relates to a device and a method for advanced nitrogen and phosphorus removal of UCT (nitrogen-phosphorus removal) by FNA (nitrogen-phosphorus removal) enhanced short-cut nitrification by using segmented water inflow, belonging to the technical field of biological sewage treatment. Partial return sludge is subjected to FNA side treatment in a step-feed UCT process, nitrite oxidizing bacteria are elutriated by utilizing the FNA to be far more inhibited than ammonia oxidizing bacteria, the short-range nitrification of a continuous flow aerobic zone is realized, and the alternate anoxic-aerobic intermittent aeration can maintain the stability of the short-range nitrification, so that a raw water carbon source is fully utilized, the aeration quantity is saved, and the deep nitrogen and phosphorus removal of the continuous flow domestic sewage is realized.
Background
With the development of social economy, the nitrogen and phosphorus content in the wastewater discharged by industry and life is higher and higher, the eutrophication phenomenon of the water body caused by the nitrogen and phosphorus content is more and more serious, and the problems of nitrogen and phosphorus removal of the urban domestic sewage are gradually emphasized. At present, most sewage treatment plants adopt a traditional nitrification and denitrification biological denitrification process, ammonia nitrogen is converted into nitrite nitrogen in an aerobic zone through ammonia oxidizing bacteria, then the nitrite nitrogen is converted into nitrate nitrogen under the action of nitrite oxidizing bacteria, and then the nitrate nitrogen is reduced into nitrogen in an anoxic zone. Recent researches find that the short-cut nitrification and denitrification technology for oxidizing ammonia nitrogen into nitrite nitrogen in an aerobic zone and directly reducing the nitrite nitrogen into nitrogen in an anoxic zone can save the aeration amount of the aerobic zone, reduce the organic carbon source demand in the denitrification process and finally reduce the sewage treatment cost. The shortcut nitrification-denitrification technology is successfully applied to high ammonia nitrogen wastewater such as sludge digestive juice and the like, but is less applied to low ammonia nitrogen municipal sewage treatment because the growth of nitrite oxidizing bacteria in a municipal sewage treatment device is difficult to stably control. Recent research results prove that under the anoxic condition, the inhibition effect of free nitrous acid, namely FNA, on nitrite oxidizing bacteria is far greater than that of ammonia oxidizing bacteria, partial nitrified sludge in a side treatment device can quickly realize short-cut nitrification, but the stable maintenance of the short-cut nitrification is very difficult, and auxiliary measures such as dissolved oxygen control, sludge discharge control and sludge age control are required.
The traditional staged water inlet process is based on the traditional A/O process and is generally formed by combining a plurality of sections of A/O in series, water is fed into each anoxic zone in a multi-point water inlet mode, sludge flows back to the first section of a reactor, denitrifying bacteria in the anoxic zone of the first section utilize part of raw water carbon source to carry out denitrification on nitrate nitrogen in the returned sludge, and nitrifying liquid in each aerobic zone and part of the fed water simultaneously flow into the anoxic zone of the next section to carry out denitrification. It can be seen that the multi-stage A/O series process of the staged water inflow is equivalent to alternate anoxic and aerobic intermittent aeration, and can also inhibit NOB and promote the stable maintenance of short-range nitrification, but the continuous flow staged water inflow process is only limited to denitrification, and usually requires external addition of medicaments for chemical phosphorus removal.
The step-feed UCT process is characterized in that an anaerobic zone is additionally arranged in the step-feed process, return sludge of a secondary sedimentation tank flows back to a first-stage anoxic zone, and a sludge-water mixed liquid flow from the first-stage anoxic zone to the anaerobic zone is additionally arranged to flow back, so that the step-feed UCT process can ensure the anaerobic environment of the anaerobic zone, thereby greatly improving the phosphorus removal performance of the process, fully utilizing the carbon source of raw water and realizing deep nitrogen and phosphorus removal.
Disclosure of Invention
The invention aims to realize short-cut nitrification by utilizing FNA to carry out side treatment on partial backflow sludge and then returning the partial backflow sludge to a main reactor on the basis of a step-feed UCT process, and the step-feed alternate anoxic-aerobic intermittent aeration can synchronously inhibit nitrite oxidizing bacteria, thereby providing guarantee for the stable maintenance of the short-cut nitrification. The domestic sewage enters an anaerobic zone, a second anoxic zone and a third anoxic zone in a segmented manner, phosphorus-accumulating bacteria in the anaerobic zone utilize organic matters which can be biologically decomposed in raw water to store an internal carbon source pHB for phosphorus release, heterotrophic denitrifying bacteria in the first anoxic zone utilize residual organic matters for denitrification reaction, meanwhile, part of the denitrifying phosphorus-accumulating bacteria use nitrite as an electron acceptor, and the internal carbon source pHB in the storage body is used as an electron donor to finish denitrification phosphorus absorption, so that the synchronous removal of nitrogen and phosphorus is realized. The mixed solution enters a first aerobic zone to carry out short-cut nitration reaction, ammonia oxidizing bacteria oxidize ammonia nitrogen into nitrite nitrogen, and aerobic phosphorus absorption reaction of phosphorus accumulating bacteria is realized. Then the mixed liquid enters a second anoxic zone to be mixed with second section of inlet water, a carbon source in the raw water is utilized for denitrification, nitrite nitrogen is reduced to nitrogen, the mixed liquid enters a second aerobic zone to carry out short-cut nitrification reaction, and ammonia oxidizing bacteria oxidize ammonia nitrogen in a second strand of raw water to nitrite nitrogen. Then the wastewater enters a third anoxic zone to be mixed with third inflow water to utilize the raw water carbon source for denitrification, and finally enters a third aerobic zone for short-cut nitrification, so that the process can remove 85% of total nitrogen and 90% of TP theoretically, and the effluent reaches the first-class A standard.
In order to achieve the above object, the present invention provides a device for deep nitrogen and phosphorus removal by UCT of segmented inflow water with FNA enhanced shortcut nitrification, comprising: the system comprises a raw water tank (1), a bioreactor (2), a secondary sedimentation tank (3) and a sludge treatment reactor (4), wherein the raw water tank (1) is provided with a water inlet pump (1.1), a water inlet valve I (1.2), a water inlet valve II (1.3) and a water inlet valve III (1.4); the bioreactor (2) is divided into 7 cells, which are respectively an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone, a third anoxic zone and a third aerobic zone, and overflow holes are arranged in a vertically staggered manner according to the water flow direction to connect the cells. The anaerobic zone and each anoxic zone are stirred and mixed through a stirrer (2.1), each aerobic zone is oxygenated through an aeration device provided with an aeration head (2.2), a gas flow meter (2.3), a gas flow regulating valve (2.4) and an air compressor (2.5), mixed liquor in the first anoxic zone flows back to the anaerobic zone through a mixed liquor reflux pump (2.6) and a mixed liquor reflux valve (2.7), and the bioreactor (2) is connected with a water inlet pipe of a secondary sedimentation tank (3) through a water outlet valve (2.8); the secondary sedimentation tank (3) is provided with a water outlet pipe (3.1), the bottom of the secondary sedimentation tank is connected with the first anoxic zone through a return sludge valve I (3.3), a sludge return pump (3.4) and a return sludge valve II (3.5), the excess sludge is discharged through an excess sludge discharge valve (3.2), and part of the return sludge is connected with the sludge treatment reactor (4) through a return sludge valve III (3.6); the sludge treatment reactor (4) is an open tank body, is provided with a chemical feeding pipe (4.1) and a stirrer (4.2), and is connected with the first anoxic zone through a sludge feeding pump (4.3) and a sludge feeding valve (4.4).
The invention also provides a method for deeply removing nitrogen and phosphorus by using the segmented inflow UCT with FNA enhanced short-cut nitrification, which comprises the following steps:
the device start-up operation is as follows: and (2) inoculating return sludge of a secondary sedimentation tank of the urban sewage treatment plant, adding the return sludge into the bioreactor (2) to enable the sludge concentration to reach 2000-4000 mg/L, controlling the hydraulic retention time HRT of the bioreactor (2) to be 10-12 h, and discharging the excess sludge through an excess sludge discharge valve (3.2) to enable the sludge age to be controlled to be 15-20 d.
The operation during the operation adjustment is as follows: domestic sewage enters a bioreactor (2) from a raw water tank (1) through a water inlet pump (1.1), part of the sewage enters an anaerobic zone through a water inlet valve I (1.2), part of the sewage enters a second anoxic zone through a water inlet valve II (1.3), and the rest sewage enters a third anoxic zone through a water inlet valve III (1.4), wherein the flow ratio of the water inlet in the three sections is 3:2: 2. Part of sewage enters the first anoxic zone from the anaerobic zone, then enters the first aerobic zone, then enters the second aerobic zone by being mixed with the other part of inlet water of the second anoxic zone, and then enters the third aerobic zone by being mixed with the inlet water of the third anoxic zone. During the period, the dissolved oxygen concentration in the aerobic zone is controlled to be 0.5-1.0 mg/L by opening the gas flow regulating valve (2.4) and controlling the gas flow meter (2.3). The mixed liquor in the first anoxic zone reflows to the anaerobic zone through a mixed liquor reflux pump (2.6) and a mixed liquor reflux valve (2.7), and the reflux ratio of the mixed liquor is controlled to be 50-100%.
The mixed liquor enters a secondary sedimentation tank (3) from the third aerobic zone through a water outlet valve (2.8) and stays for 2-3 hours, so that mud-water separation is realized, the return sludge is conveyed to the first anoxic zone through a sludge return pump (3.4), and the reflux ratio is 80-150%. Wherein 5-10% of the return sludge enters the sludge treatment reactor (4) through a return sludge valve III (3.6), sodium nitrite is added into the sludge treatment reactor (4) through a chemical feeding pipe (4.1) to ensure that the concentration of nitrite nitrogen is 300-1200 mg/L, the pH value in the sludge treatment reactor (4) is adjusted to be 5.5-6.0 through adding acid or alkali, and the sludge treatment time is 12-24 h. The treated sludge is conveyed to a first anoxic zone through a sludge feeding pump (4.3) and a sludge feeding valve (4.4).
The technical principle of the invention is as follows:
an anaerobic zone: the first strand of inlet water and mixed liquor pumped by the mixed liquor reflux pump from the first anoxic zone simultaneously enter the anaerobic zone and are mixed with the mixed liquor in the anaerobic zone, the phosphorus-accumulating bacteria absorb biodegradable organic matters in raw water under the stirring action of the stirrer, the biodegradable organic matters are stored in the phosphorus-accumulating bacteria in the form of an internal carbon source PHB, and simultaneously a large amount of soluble orthophosphate is released; a first anoxic zone: mixing the residual sludge returned from the secondary sedimentation tank, the sludge returned from the sludge treatment reactor and treated by FNA with the effluent of the anaerobic zone, feeding the mixture into a first anoxic zone, carrying out denitrification reaction by using the residual organic matters by using heterotrophic denitrifying bacteria under the stirring action of a stirrer, and simultaneously completing denitrification phosphorus absorption by using partial denitrifying phosphorus accumulating bacteria and nitrite as electron acceptors and using an internal carbon source PHB in the storage body of the anaerobic reactor as an electron donor to realize synchronous removal of nitrogen and phosphorus; a first aerobic zone: the mixed liquid of the effluent of the first anoxic zone enters a first aerobic zone, heterotrophic bacteria oxidize the remaining small amount of organic matters, ammonia oxidizing bacteria convert ammonia nitrogen into nitrite nitrogen, and phosphorus accumulating bacteria finish the aerobic phosphorus absorption process. The aeration quantity is adjusted according to the water inlet and outlet conditions in the running state, and the ammonia nitrogen of the outlet water of the first aerobic zone is controlled to be 0-3 mg/L; a second anoxic zone: mixing the second stream of inlet water with the nitrified liquid in the first aerobic zone, allowing the mixture to enter a second anoxic zone, and performing denitrification reaction by heterotrophic denitrifying bacteria under the stirring action of a stirrer by using organic matters in the second stream of inlet water, wherein the denitrification reaction is accompanied with the absorption of phosphate; a second aerobic zone: the function is the same as that of the first aerobic zone; a third anoxic zone: the function is the same as that of the second anoxic zone; a third aerobic zone: the function is the same as that of the first aerobic zone.
A secondary sedimentation tank: the mixed liquid in the third aerobic zone enters a secondary sedimentation tank for mud-water separation, supernatant liquid is discharged, sludge is precipitated in a sludge hopper, part of the sludge is lifted to the first anoxic zone through a return sludge control valve and a sludge return pump, wherein 5-10% of the return sludge enters a sludge treatment reactor through a return sludge valve III, and residual sludge is discharged; a sludge treatment reactor: and (2) allowing part of the returned sludge to enter a sludge treatment reactor, adding sodium nitrite to ensure that the concentration of nitrite nitrogen is 300-1200 mg/L, and adjusting the pH to 5.5-6.0 by adding acid or alkali, wherein the sludge treatment time is 12-24 h. The inhibition degree of Free Nitrous Acid (FNA) on nitrite oxidizing bacteria is far greater than that of ammonia oxidizing bacteria, the nitrite oxidizing bacteria are elutriated in combination with the low sludge age of 15-20 days of reactor sludge discharge, and short-cut nitrification is rapidly started. And the staged water inlet alternate anoxic and aerobic intermittent aeration can synchronously inhibit nitrite oxidizing bacteria, thereby providing guarantee for the stable maintenance of the short-cut nitrification.
Compared with the prior art, the invention has the following advantages:
1. raw water enters the anaerobic zone and the anoxic zone in sections to carry out phosphorus release and denitrification reactions, a raw water carbon source is utilized to the maximum extent, and the anaerobic environment of the anaerobic zone can be ensured by combining the UCT process, so that the phosphorus removal performance of the process is greatly improved, and the deep nitrogen and phosphorus removal of the low-C/N domestic sewage can be realized without adding an external carbon source.
2. Partial excess sludge is subjected to side treatment by FNA, short sludge age of the excess sludge is elutriated to remove nitrite oxidizing bacteria, short-cut nitrification can be quickly realized, and sectional water inflow alternate anoxic-aerobic intermittent aeration can synchronously inhibit nitrite oxidizing bacteria, so that guarantee is provided for stable maintenance of short-cut nitrification, aeration quantity is saved, and energy consumption is reduced.
3. The sludge yield is low, so that the sludge discharge amount of the device is low, and the sludge disposal cost is low. The anaerobic and aerobic intermittent aeration inhibits the growth of filamentous bacteria to a certain extent and reduces the possibility of filamentous bacteria sludge bulking.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention.
The main symbols are as follows: 1-raw water tank; 2-a bioreactor; 3-secondary sedimentation tank; 4-a sludge treatment reactor; 1.1-water inlet pump; 1.2-inlet valve I; 1.3-inlet valve II; 1.4-inlet valve III; 2.1-stirrer; 2.2-aeration head; 2.3-gas flow meter; 2.4-air volume regulating valve; 2.5-air compressor; 2.6-mixed liquid reflux pump; 2.7-mixed liquor reflux valve; 2.8-water outlet valve; 3.1-water outlet pipe; 3.2 a residual sludge discharge valve; 3.3-return sludge valve I; 3.4-sludge reflux pump; 3.5-return sludge valve II; 3.6-reflux sludge valve III; 4.1-a medicine feeding pipe; 4.2-stirrer; 4.3-sludge feeding pump; 4.4-sludge feeding valve.
Detailed Description
The invention is further explained in detail with reference to the drawings and examples.
As shown in figure 1, the device for deep nitrogen and phosphorus removal of the segmented inflow UCT by FNA enhanced short-cut nitrification comprises: the system comprises a raw water tank (1), a bioreactor (2), a secondary sedimentation tank (3) and a sludge treatment reactor (4), wherein the raw water tank (1) is provided with a water inlet pump (1.1), a water inlet valve I (1.2), a water inlet valve II (1.3) and a water inlet valve III (1.4); the bioreactor (2) is divided into 7 cells, which are respectively an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone, a third anoxic zone and a third aerobic zone, and overflow holes are arranged in a vertically staggered manner according to the water flow direction to connect the cells. The anaerobic zone and each anoxic zone are stirred and mixed through a stirrer (2.1), each aerobic zone is oxygenated through an aeration device provided with an aeration head (2.2), a gas flow meter (2.3), a gas flow regulating valve (2.4) and an air compressor (2.5), mixed liquor in the first anoxic zone flows back to the anaerobic zone through a mixed liquor reflux pump (2.6) and a mixed liquor reflux valve (2.7), and the bioreactor (2) is connected with a water inlet pipe of a secondary sedimentation tank (3) through a water outlet valve (2.8); the secondary sedimentation tank (3) is provided with a water outlet pipe (3.1), the bottom of the secondary sedimentation tank is connected with the first anoxic zone through a return sludge valve I (3.3), a sludge return pump (3.4) and a return sludge valve II (3.5), the excess sludge is discharged through an excess sludge discharge valve (3.2), and part of the return sludge is connected with the sludge treatment reactor (4) through a return sludge valve III (3.6); the sludge treatment reactor (4) is an open tank body, is provided with a chemical feeding pipe (4.1) and a stirrer (4.2), and is connected with the first anoxic zone through a sludge feeding pump (4.3) and a sludge feeding valve (4.4).
The test water adopts domestic sewage discharged from the family district of Beijing university of industry, and the water quality is as follows: pH is 7.0-7.9, COD concentration is 130-4 +-N concentration of 60-80mg/L, NO2 --N and NO3 -N is below the detection limit, and the ratio of COD to N is 2-3. Experimental inoculation sludge from citySecondary sedimentation tank excess sludge of municipal sewage treatment plants. Each reactor is made of organic glass, the effective volume of the bioreactor is 30L, and the bioreactor is divided into 7 cells. The specific operation process is as follows:
the device start-up operation is as follows: and (2) inoculating return sludge of a secondary sedimentation tank of the urban sewage treatment plant, adding the return sludge into the bioreactor (2) to enable the sludge concentration to reach 2000-4000 mg/L, controlling the hydraulic retention time HRT of the bioreactor (2) to be 10-12 h, and discharging the excess sludge through an excess sludge discharge valve (3.2) to enable the sludge age to be controlled to be 15-20 d.
The operation during the operation adjustment is as follows: domestic sewage enters a bioreactor (2) from a raw water tank (1) through a water inlet pump (1.1), part of the sewage enters an anaerobic zone through a water inlet valve I (1.2), part of the sewage enters a second anoxic zone through a water inlet valve II (1.3), and the rest sewage enters a third anoxic zone through a water inlet valve III (1.4), wherein the ratio of water inlet in the three sections is 3:2: 2. Part of sewage enters the first anoxic zone from the anaerobic zone, then enters the first aerobic zone, then enters the second aerobic zone by being mixed with the other part of inlet water of the second anoxic zone, and then enters the third aerobic zone by being mixed with the inlet water of the third anoxic zone. During the period, the dissolved oxygen concentration in the aerobic zone is controlled to be 0.5-1.0 mg/L by opening the gas flow regulating valve (2.4) and controlling the gas flow meter (2.3). The mixed liquor in the first anoxic zone reflows to the anaerobic zone through a mixed liquor reflux pump (2.6) and a mixed liquor reflux valve (2.7), and the reflux ratio of the mixed liquor is controlled to be 50-100%.
The mixed liquor enters a secondary sedimentation tank (3) from the third aerobic zone through a water outlet valve (2.8) and stays for 2-3 hours, so that mud-water separation is realized, the return sludge is conveyed to the first anoxic zone through a sludge return pump (3.4), and the reflux ratio is 80-150%. Wherein 5-10% of the return sludge enters the sludge treatment reactor (4) through a return sludge valve III (3.6), sodium nitrite is added into the sludge treatment reactor (4) through a chemical feeding pipe (4.1) to ensure that the concentration of nitrite nitrogen is 300-1200 mg/L, the pH value in the sludge treatment reactor (4) is adjusted to be 5.5-6.0 through adding acid or alkali, and the sludge treatment time is 12-24 h. The treated sludge is conveyed to a first anoxic zone through a sludge feeding pump (4.3) and a sludge feeding valve (4.4).
The test result shows that: after the operation is stable, no external carbon source is addedUnder the condition that the COD concentration of the effluent of the device is 30-50mg/L and NH4 +A concentration of-N of<5mg/L，NO2 --N<3mg/L，NO3 --N<1mg/L， TN<10mg/L，TP<0.5mg/L, which reaches the first class A standard of pollutant discharge Standard of urban Sewage treatment plant (GB 18918-2002).

Claims (1)

  1. The method for UCT deep nitrogen and phosphorus removal by stage water inlet of FNA enhanced short-cut nitrification comprises the steps that a raw water tank (1), a bioreactor (2), a secondary sedimentation tank (3) and a sludge treatment reactor (4) are arranged in the device, wherein the raw water tank (1) is provided with a water inlet pump (1.1), a water inlet valve I (1.2), a water inlet valve II (1.3) and a water inlet valve III (1.4); the bioreactor (2) is divided into 7 grid chambers which are respectively an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone, a third anoxic zone and a third aerobic zone, and overflow holes are arranged in a vertically staggered manner according to the water flow direction to connect the grid chambers; the anaerobic zone and each anoxic zone are stirred and mixed by a stirrer, each aerobic zone is oxygenated by an aeration device provided with an aeration head (2.2), a gas flow meter (2.3), a gas quantity regulating valve (2.4) and an air compressor (2.5), mixed liquor in the first anoxic zone flows back to the anaerobic zone by a mixed liquor reflux pump (2.6) and a mixed liquor reflux valve (2.7), and the bioreactor (2) is connected with a water inlet pipe of a secondary sedimentation tank (3) by a water outlet valve (2.8); the secondary sedimentation tank (3) is provided with a water outlet pipe (3.1), the bottom of the secondary sedimentation tank is connected with the first anoxic zone through a return sludge valve I (3.3), a sludge return pump (3.4) and a return sludge valve II (3.5), the excess sludge is discharged through an excess sludge discharge valve (3.2), and part of the return sludge is connected with the sludge treatment reactor (4) through a return sludge valve III (3.6); the sludge treatment reactor (4) is an open tank body, is provided with a dosing pipe (4.1) and a stirrer, and is connected with the first anoxic zone through a sludge feeding pump (4.3) and a sludge feeding valve (4.4);
    the method is characterized by comprising the following steps:
    1) the device start-up operation is as follows: inoculating return sludge of a secondary sedimentation tank of an urban sewage treatment plant, adding the return sludge into a bioreactor (2) to enable the concentration of the sludge to reach 2000-4000 mg/L, controlling the hydraulic retention time HRT of the bioreactor (2) to be 10-12 h, and discharging excess sludge through an excess sludge discharge valve (3.2) to enable the sludge age to be 15-20 d;
    2) the operation during the operation adjustment is as follows:
    2.1) domestic sewage enters a bioreactor (2) from a raw water tank (1) through a water inlet pump (1.1), wherein part of the sewage enters an anaerobic zone through a water inlet valve I (1.2), part of the sewage enters a second anoxic zone through a water inlet valve II (1.3), and the rest of the sewage enters a third anoxic zone through a water inlet valve III (1.4), wherein the flow ratio of the three-stage water inlet is 3:2: 2; part of sewage enters a first anoxic zone from the anaerobic zone, then enters a first aerobic zone, is mixed with the other part of inlet water of a second anoxic zone, enters a second aerobic zone, is mixed with the inlet water of a third anoxic zone, and enters a third aerobic zone; during the period, the dissolved oxygen concentration in the aerobic zone is controlled to be 0.5-1.0 mg/L through the opening of the gas flow regulating valve (2.4) and the control of the gas flow meter (2.3); the mixed liquor in the first anoxic zone reflows to the anaerobic zone through a mixed liquor reflux pump (2.6) and a mixed liquor reflux valve (2.7), and the reflux ratio of the mixed liquor is controlled to be 50-100%;
    2.2) the mixed liquor enters a secondary sedimentation tank (3) from a third aerobic zone through a water outlet valve (2.8) and stays for 2-3 hours, so that sludge-water separation is realized, the return sludge is conveyed to a first anoxic zone through a sludge return pump (3.4), and the reflux ratio is 80-150%; wherein 5-10% of the return sludge enters a sludge treatment reactor (4) through a return sludge valve III (3.6), sodium nitrite is added into the sludge treatment reactor (4) through a chemical feeding pipe (4.1) to ensure that the concentration of nitrite nitrogen is 300-1200 mg/L, the pH value in the sludge treatment reactor (4) is adjusted to be 5.5-6.0 by adding acid or alkali, and the sludge treatment time is 12-24 h; the treated sludge is conveyed to a first anoxic zone through a sludge feeding pump (4.3) and a sludge feeding valve (4.4).
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CN109809566A (en) * 2019-04-09 2019-05-28 沈阳环境科学研究院 A kind of AAO biological reaction pool of branch water inlet
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CN112456641B (en) * 2020-10-16 2022-04-22 北京工业大学 Device and method for realizing continuous flow synchronous short-cut nitrification and denitrification dephosphorization based on sludge side treatment
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