CN107162188B - Device and method for integrated autotrophic nitrogen removal and synchronous reinforcement of biological phosphorus removal - Google Patents
Device and method for integrated autotrophic nitrogen removal and synchronous reinforcement of biological phosphorus removal Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
An integrated autotrophic nitrogen removal and synchronous enhanced biological phosphorus removal device and a method belong to the field of biological sewage treatment. The integrated autotrophic nitrogen removal synchronous enhanced biological phosphorus removal system mainly comprises three bacteria: nitrosobacteria, phosphorus accumulating bacteria and anaerobic ammonium oxidation bacteria attached to sponge filler. The urban domestic sewage enters the integrated EBPR + PN/A-SBR reactor from the water inlet tank, phosphorus is released by phosphorus accumulating bacteria in an anaerobic section, and an internal carbon source is stored; after the phosphorus release is finished, aeration is started, partial short-cut nitrification and aerobic phosphorus absorption reaction are carried out, and partial synchronous anaerobic ammoxidation is carried out at the same time; and (3) carrying out anaerobic ammonia oxidation reaction on anaerobic ammonia oxidation bacteria in the anoxic section by using the residual ammonia nitrogen and nitrite generated by short-cut nitrification. The invention makes full use of the carbon source of raw water, and the sponge filler biomembrane is suitable for the growth of anaerobic ammonium oxidation bacteria with longer sludge age, solves the sludge age contradiction with phosphorus accumulating bacteria, saves the aeration energy consumption, and can realize the purpose of deep denitrification and dephosphorization of urban domestic sewage with low carbon-nitrogen ratio.
Description
Technical Field
The invention relates to an integrated autotrophic nitrogen removal and synchronous reinforcement biological phosphorus removal device and method, belonging to the field of biological sewage treatment.
Background
In recent years, the aggravation of nitrogen and phosphorus pollution is a main reason for the large-scale outbreak of water bloom and red tide in lakes, rivers, offshore waters and other water areas in China, and is also one of the major environmental problems facing the current society. The traditional nitrification and denitrification nitrogen and phosphorus removal process needs a large amount of aeration, and additional addition of organic carbon source and alkalinity, and has high investment and operation cost and possibility of generating secondary pollution. Therefore, the method has low energy consumption, economically and efficiently realizes the removal of organic matters in the sewage, and simultaneously, the deep denitrification and dephosphorization is the development direction of sewage treatment in China.
Anaerobic ammonia oxidation is used as a novel high-efficiency biological denitrification technology, and means that microorganisms directly use NO under the anaerobic or anoxic condition2 -N is an electron acceptor, NH4 +N is an electron donor, two nitrogen elements are simultaneously converted into nitrogen in the biological reaction process, organic carbon sources are not consumed in the biological reaction process, the defect that the carbon sources are insufficient in the traditional nitrogen and phosphorus removal process is overcome, the aeration energy consumption can be saved, and the residual sludge amount is greatly reduced.
The integrated autotrophic nitrogen removal synchronous enhanced biological phosphorus removal system combines shortcut nitrification anaerobic ammonium oxidation and enhanced biological phosphorus removal, can fully utilize a raw water carbon source, saves aeration energy consumption and realizes synchronous nitrogen and phosphorus removal. The integrated reactor is adopted, the anaerobic ammonia oxidizing bacteria are highly intercepted by the sponge filler, the anaerobic ammonia oxidizing bacteria multiplication time is longer, the loss of functional bacteria caused by sludge discharge is avoided, and the anoxic microenvironment of the filler creates suitable conditions for the anaerobic ammonia oxidizing bacteria reaction and proliferation.
In the process of realizing integrated autotrophic nitrogen removal and simultaneous enhanced biological phosphorus removal, the parameter change of the reactor system is monitored in real time through a real-time platform, the parameter control is optimized, partial shortcut nitrification anaerobic ammonia oxidation and enhanced biological phosphorus removal can be stably maintained and realized, and the effect of simultaneously deeply removing nitrogen and phosphorus is achieved. Therefore, the invention is a sewage biological treatment process with application prospect and value.
Disclosure of Invention
The invention aims to provide an integrated autotrophic nitrogen removal and synchronous reinforcement biological phosphorus removal device and method, which achieve the aims of deep and efficient nitrogen and phosphorus removal during sewage biological treatment. The enhanced biological phosphorus removal and partial shortcut nitrification anaerobic ammonia oxidation are synchronously coupled in a reactor, part of shortcut nitrification is used for providing ammonia nitrogen and nitrite nitrogen for anaerobic ammonia oxidation, and simultaneously the enhanced biological phosphorus removal and part of shortcut nitrification are synchronous, so that the deep nitrogen and phosphorus removal of the municipal sewage with low C/N ratio can reach the pollutant discharge first-grade A standard of the urban sewage treatment plant.
The invention is realized by the following technical steps:
the device of biological dephosphorization is reinforceed in step in autotrophic nitrogen removal of integration, its characterized in that includes: the system comprises a raw water tank (1) of urban domestic sewage, an integrated EBPR + PN/A-SBR reactor (3) and a real-time control platform (14). The urban domestic sewage raw water tank (1) is connected with the integrated EBPR + PN/A-SBR reactor (3) through a water inlet pump (2), and the treated sewage is discharged from a water outlet (16) of the integrated EBPR + PN/A-SBR reactor (3).
The integrated EBPR + PN/A-SBR reactor (3) is provided with a water inlet (4), a stirrer (5), an air pump (6), an aeration disc (7), a gas flowmeter (8), a sponge packing frame (9) and NH4 +-N sensor (10), NO2 --N sensor (11), NO3 --N sensor (12), DO, pH apparatus (13), real-time control platform (14), overflow port (15), water outlet (16), water outlet valve (17), mud valve(18) And a water outlet tank (19).
The method for carrying out integrated autotrophic nitrogen removal and synchronous enhanced biological phosphorus removal by utilizing the device is characterized by comprising the following treatment processes:
1) urban sewage enters an integrated EBPR + PN/A-SBR reactor (3) from an urban sewage raw water tank (1) through a water inlet pump (2), after water inlet is finished, a stirrer (5) starts stirring to perform anaerobic phosphorus release reaction, DO is controlled to be less than 0.2mg/L, the rotating speed of the stirrer is 60-80 r/min, and the anaerobic reaction is 90-120 min;
2) after the anaerobic treatment is finished, the air pump (6) is started, DO is controlled to be 0.5-1 mg/L through the gas flowmeter (8), and partial short-cut nitrification and aerobic phosphorus absorption processes are carried out; NH (NH)4 +-N sensor (10), NO2 --N sensor (11), NO3 --the N sensor (12), DO, pH meter (13) transmits the acquired signals to the real-time control platform (14) in real time;
3) the real-time control platform (14) receives, converts and outputs the acquired signals in real time, monitors the ammonia nitrogen concentration, the nitrite nitrogen concentration, the nitrate nitrogen concentration and the DO concentration in the integrated EBPR + PN/A-SBR reactor (3) on line, adjusts the operation parameters in real time according to the monitoring data, controls the nitrosation process, stops aeration when the mass concentration ratio of the ammonia nitrogen concentration to the nitrite nitrogen is 1: 1-1: 1.32, and controls the reaction to be a partial short-cut nitrification stage;
4) after the aeration is finished, the air pump (6) is closed. Discharging part of mixed sludge from the integrated EBPR + PN/A-SBR reactor (3), controlling the sludge age to be 10-12 d and the sludge concentration to be 2500-3200 mg/L;
5) and then carrying out anoxic stirring, monitoring the ammonia nitrogen concentration and the nitrite nitrogen concentration in the integrated EBPR + PN/A-SBR reactor (3) on line through a real-time platform, and stopping stirring by the stirrer (5) when the ammonia nitrogen reaction is finished and the nitrite nitrogen concentration is less than 1 mg/L. Controlling the anoxic section to be 60-90 min;
6) after the anoxic reaction is finished, standing and precipitating for 20min, separating mud and water, and discharging supernatant from a water outlet (16) to a water outlet tank (19) through a water outlet valve (17).
The integrated autotrophic nitrogen removal synchronous reinforced biological phosphorus removal device and the method have the following advantages:
1. the method couples the enhanced biological phosphorus removal, partial shortcut nitrification and anaerobic ammonia oxidation in a reactor, solves the problem of insufficient carbon source for nitrogen and phosphorus removal of the low C/N ratio municipal domestic sewage, and simultaneously realizes sludge reduction;
2. the preposed anaerobic section effectively stores a carbon source in the urban domestic sewage, and phosphorus is released by phosphorus accumulating bacteria; in the aerobic section, part of short-range phosphorus absorption and aerobic phosphorus absorption are combined, so that nitrogen and phosphorus removal are synchronously performed, and the aeration energy consumption is saved;
3. in the anoxic section, anaerobic ammonium oxidation bacteria fully utilize part of nitrite nitrogen generated by short-cut nitrification to react with residual ammonia nitrogen to generate nitrogen, no additional carbon source is needed, and the sludge yield is low;
4. anaerobic ammonia oxidizing bacteria are highly intercepted by the sponge filler, so that the anaerobic ammonia oxidizing bacteria are attached to the fixed sponge filler frame in a biofilm form, the longer multiplication time of the anaerobic ammonia oxidizing bacteria is suitable, the loss of functional bacteria caused by sludge discharge is avoided, and an anoxic microenvironment of the filler creates suitable conditions for the reaction and proliferation of the anaerobic ammonia oxidizing bacteria;
5. the system is controlled in real time through the real-time control platform, so that the controllability of the system is improved, the operation of the system is optimized, and partial shortcut nitrification and anaerobic ammoxidation are easily realized and stably maintained.
Drawings
FIG. 1 is a schematic structural diagram of the integrated autotrophic nitrogen removal and synchronous reinforcement biological phosphorus removal device.
1-city domestic sewage raw water tank 2-water inlet pump
3-integrated EBPR + PN/A-SBR reactor 4-water inlet 5-stirrer
6-air pump 7-aeration disc 8-gas flowmeter 9-sponge packing frame
10-NH4 +-N sensor 11-NO2 --N sensor 12-NO3 --N sensor
13-DO, pH determinator 14-real-time control platform 15-overflow port
16-water outlet 17-water outlet valve 18-mud valve 19-water outlet tank
Detailed Description
The invention is further illustrated with reference to figure 1 and the example implementation.
As shown in FIG. 1, the apparatus of the integrated autotrophic nitrogen removal and simultaneous enhanced biological phosphorus removal method comprises: the system comprises a raw water tank (1) of urban domestic sewage, an integrated EBPR + PN/A-SBR reactor (3) and a real-time control platform (14). The urban domestic sewage raw water tank (1) is connected with the integrated EBPR + PN/A-SBR reactor (3) through a water inlet pump (2). The integrated EBPR + PN/A-SBR reactor is provided with a water inlet (4), a stirrer (5), an air pump (6), an aeration disc (7), a gas flowmeter (8), a sponge filler frame (9) and NH4 +-N sensor (10), NO2 --N sensor (11), NO3 -An N sensor (12), a DO and pH measuring instrument (13), a real-time control platform (14), an overflow port (15), a water outlet (16), a water outlet valve (17), a mud valve (18) and a water outlet tank (19).
The integrated autotrophic nitrogen removal synchronous enhanced biological phosphorus removal method specifically comprises the following operation processes:
1) urban domestic sewage firstly enters an integrated EBPR + PN/A-SBR reactor (3) from an urban domestic sewage raw water tank (1) through a water inlet pump (2), after water inlet is finished, a stirrer (5) starts stirring, DO is controlled to be less than 0.2mg/L, phosphorus accumulating bacteria synthesize PHA by using organic matters in the urban sewage, and meanwhile, anaerobic phosphorus release reaction is carried out for 90-120 min; controlling the rotating speed of the stirrer (5) to be 60-80 r/min;
2) after the anaerobic reaction is finished, an air pump (6) is started, DO is controlled to be 0.5-1 mg/L through a gas flowmeter (8), the phosphorus accumulating bacteria take oxygen as an electron acceptor, PHA synthesized in an anaerobic section is taken as an electron donor for aerobic phosphorus absorption, meanwhile, partial shortcut nitrification is carried out by the shortcut nitrification bacteria, and at the moment, part of anaerobic ammonia oxidation bacteria can utilize nitrite nitrogen and ammonia nitrogen generated by partial shortcut nitrification to carry out anaerobic ammonia oxidation reaction;
3) at the same time, NH4 +-N sensor (10), NO2 --N sensor (11), NO3 --the N sensor (12), DO, pH meter (13) transmits the acquired signals to the real-time control platform (3) in real time; the real-time control platform (14) is connectedReceiving and converting and outputting signals collected by each sensor, monitoring the ammonia nitrogen concentration, the nitrite nitrogen concentration, the nitrate nitrogen concentration and the dissolved oxygen concentration in the integrated EBPR + PN/A-SBR reactor (3) on line, stopping aeration when the mass concentration ratio of the ammonia nitrogen concentration to the nitrite nitrogen is 1: 1-1: 1.32, and controlling the reaction to be a partial short-cut nitrification stage;
4) after the aeration is finished, the air pump (6) is closed. Discharging part of mixed sludge from the integrated EBPR + PN/A-SBR reactor (3), controlling the sludge age to be 10-12 d and the sludge concentration to be 2500-3200 mg/L;
5) and then carrying out anoxic stirring, monitoring the ammonia nitrogen concentration and the nitrite nitrogen concentration in the integrated EBPR + PN/A-SBR reactor (3) on line through a real-time platform, and stopping stirring by the stirrer (5) when the ammonia nitrogen reaction is finished and the nitrite nitrogen concentration is less than 1 mg/L. Controlling the anoxic section to be 60-90 min;
6) after the anoxic reaction is finished, standing and precipitating for 20min, separating mud and water, and discharging supernatant from a water outlet (16) to a water outlet tank (19) through a water outlet valve (17).
The above experiment was conducted to examine the nitrogen and phosphorus removal performance of the integrated system, with respect to the domestic sewage discharged from residential areas of family members around a university.
The quality of the inlet water during the experiment was as follows:
operating parameters during the experiment:
the effective volume of the integrated EBPR + PN/A-SBR reactor (2) is 10L;
an anaerobic stage: 5L of domestic sewage enters the reactor, the rotating speed of the stirrer is controlled to be 60-80 r/min, DO is less than 0.2mg/L, and the reaction time is 90-120 min;
an aerobic stage: aerating for 180-240 min, and controlling DO to be 0.5-1 mg/L;
and (3) hypoxia stage: the anoxic time is 60-90 min, and when the ammonia nitrogen reaction is finished and the concentration of nitrite nitrogen is less than 1mg/L, the stirring of the stirrer is stopped;
a drainage stage: standing and precipitating for 20min, draining 5L, controlling the sludge concentration to be 2500-3200 mg/L, and controlling the sludge age to be 10-12 d.
Under the running condition, the average COD of the effluent is less than 35mg/L, NH4 +-N＜1mg/L、NO2 --N＜1mg/L、NO3 -N is less than 5mg/L, TN and less than 6.5mg/L, TP, the average is about 0.21mg/L, and the average value stably reaches the national first-class A standard.
Claims (1)
1. The integrated autotrophic nitrogen removal and synchronous reinforced biological phosphorus removal method adopts the following devices: the system comprises a raw water tank (1) of urban domestic sewage, an integrated EBPR + PN/A-SBR reactor (3) and a real-time control platform (14); wherein the urban domestic sewage raw water tank (1) is connected with the integrated EBPR + PN/A-SBR reactor (3) through a water inlet pump (2), and the treated sewage is discharged to a water outlet tank (19) from a water outlet (16) of the integrated EBPR + PN/A-SBR reactor (3);
the integrated EBPR + PN/A-SBR reactor (3) is provided with a water inlet (4), a stirrer (5), an air pump (6), an aeration disc (7), a gas flowmeter (8), a sponge packing frame (9) and NH4 +-N sensor (10), NO2 --N sensor (11), NO3 -An N sensor (12), a DO and pH meter (13), a real-time control platform (14), an overflow port (15), a water outlet (16), a water outlet valve (17), a mud valve (18) and a water outlet tank (19); wherein the sponge filler is fixed on the sponge filler frame (9), and the filling ratio is 20-40%;
1) urban sewage enters an integrated EBPR + PN/A-SBR reactor (3) from an urban sewage raw water tank (1) through a water inlet pump (2), after water inlet is finished, a stirrer (5) starts stirring to perform anaerobic phosphorus release reaction, DO is controlled to be less than 0.2mg/L, the rotating speed of the stirrer is 60-80 r/min, and the anaerobic reaction is 90-120 min;
2) after the anaerobic treatment is finished, the air pump (6) is started, DO is controlled to be 0.5-1 mg/L through the gas flowmeter (8), and partial short-cut nitrification and aerobic phosphorus absorption processes are carried out; NH (NH)4 +-N sensor (10), NO2 --N sensor (11), NO3 --the N sensor (12), DO, pH meter (13) transmits the acquired signals to the real-time control platform (14) in real time;
3) the real-time control platform (14) receives, converts and outputs the acquired signals in real time, monitors the ammonia nitrogen concentration, the nitrite nitrogen concentration, the nitrate nitrogen concentration and the DO concentration in the integrated EBPR + PN/A-SBR reactor (3) on line, adjusts the operation parameters in real time according to the monitoring data, controls the nitrosation process, stops aeration when the mass concentration ratio of the ammonia nitrogen concentration to the nitrite nitrogen is 1: 1-1: 1.32, and controls the reaction to be a partial short-cut nitrification stage;
4) after the aeration is finished, the air pump (6) is closed; discharging part of mixed sludge from the integrated EBPR + PN/A-SBR reactor (3), controlling the sludge age to be 10-12 d and the sludge concentration to be 2500-3200 mg/L;
5) then carrying out anoxic stirring, monitoring the ammonia nitrogen concentration and the nitrite nitrogen concentration in the integrated EBPR + PN/A-SBR reactor (3) on line through a real-time platform, and stopping stirring by the stirrer (5) when the ammonia nitrogen reaction is finished and the nitrite nitrogen concentration is less than 1 mg/L; controlling the anoxic section to be 60-90 min;
6) after the anoxic reaction is finished, standing and precipitating for 20min, separating mud and water, and discharging supernatant from a water outlet (16) to a water outlet tank (19) through a water outlet valve (17).
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| CN109650543B (en) * | 2019-02-18 | 2022-01-07 | 青岛大学 | SPNA integrated denitrification method for treating low-matrix wastewater under continuous flow condition |
| CN110002595A (en) * | 2019-05-10 | 2019-07-12 | 北京工业大学 | Two sections of sequencing batch reactors realize the treatment process of municipal sewage denitrogenation dephosphorizing coupling sludge fermentation |
| CN111547849A (en) * | 2020-05-20 | 2020-08-18 | 上海环境工程设计研究院有限公司 | Sewage denitrification dephosphorization device and method |
| GB202015889D0 (en) * | 2020-10-07 | 2020-11-18 | Hias Iks | Methods and systems |
| CN113072183B (en) * | 2021-04-08 | 2022-10-18 | 北京工业大学 | Method and device for realizing mainstream anaerobic ammonia oxidation in-situ enrichment through traditional activated sludge |
| CN113184996B (en) * | 2021-05-27 | 2022-08-30 | 中国科学院生态环境研究中心 | Self-control-based integrated autotrophic nitrogen removal coupled biological phosphorus removal method and device |
| CN115161235A (en) * | 2022-07-08 | 2022-10-11 | 山东美泉环保科技有限公司 | Culture method and culture device of anaerobic ammonium oxidation bacteria and application of anaerobic ammonium oxidation bacteria in treatment of industrial wastewater |
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