CN113023888A - Device and method for synchronously treating domestic sewage and nitrate wastewater by using denitrification dephosphorization coupled with shortcut nitrification anaerobic ammonia oxidation - Google Patents
Device and method for synchronously treating domestic sewage and nitrate wastewater by using denitrification dephosphorization coupled with shortcut nitrification anaerobic ammonia oxidation Download PDFInfo
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Abstract
The invention discloses a device and a method for synchronously treating domestic sewage and nitrate wastewater by using denitrification dephosphorization coupled with shortcut nitrification anaerobic ammonia oxidation. Nitrate wastewater and municipal sewage respectively enter a denitrification dephosphorization reactor according to a proportion, a carbon source in organic matter storage in domestic sewage is fully utilized in an anaerobic stage and phosphorus is released, and nitrate is utilized as an electron acceptor to complete a phosphorus absorption process in an anoxic stage; the domestic sewage enters a short-cut nitrification A/O dephosphorization reactor to oxidize ammonia nitrogen into nitrite and simultaneously complete the dephosphorization process. The effluent of the denitrification dephosphorization reactor and the effluent of the shortcut nitrification reactor are mixed in a proper proportion and then enter the anaerobic ammonia oxidation reactor to finish the final denitrification process, and the method can realize the synchronous denitrification and dephosphorization of the domestic sewage and the nitrate wastewater.
Description
Technical Field
The invention relates to a process for synchronously treating domestic sewage and nitrate wastewater by using denitrification dephosphorization coupled with shortcut nitrification anaerobic ammonia oxidation, belonging to the technical field of biological sewage treatment. Specifically, domestic sewage and nitrate wastewater respectively enter a denitrification dephosphorization reactor in proportion, an organic matter storage internal carbon source in the domestic sewage is fully utilized in an anaerobic section to release phosphorus, and nitrate is utilized as an electron acceptor in an anoxic section to complete a phosphorus absorption process; the domestic sewage enters a short-cut nitrification A/O dephosphorization reactor to oxidize ammonia nitrogen into nitrite and simultaneously complete the dephosphorization process. The effluent of the denitrification dephosphorization reactor and the effluent of the shortcut nitrification A/O dephosphorization reactor are mixed in a proper proportion and then enter an anaerobic ammonia oxidation reactor, so that the synchronous denitrification and dephosphorization of the domestic sewage and the nitrate wastewater are realized.
Background
With the acceleration of industrialization and urbanization in China, the wastewater discharge and water pollution are increasingly serious, and the form of water resource pollution is still very severe. The most prominent problem is water eutrophication, the excessive N, P element discharged into water is the main cause of water eutrophication, and nitrogen and phosphorus removal is also the primary task of sewage treatment plants. Because the urban sewage has the characteristic of low C/N ratio, the organic matters are difficult to meet the requirements of dephosphorization and denitrification at the same time. At present, chemical phosphorus removal and a traditional nitrification-denitrification nitrogen removal technology are adopted in most sewage treatment plants, an external carbon source is required to be added during denitrification, the aeration energy consumption is high in the process, and the sludge yield is high.
Anammox has recently been the focus of the field of wastewater treatment, namely, the use of NO under anaerobic conditions2 --N is an electron acceptor, NH4 +Conversion of-N to N2. The anaerobic ammonium oxidation bacteria are autotrophic bacteria, so that no organic matters are required to be added, oxygen is not required to be supplied, the anaerobic ammonium oxidation bacteria grow slowly, the yield is low, and the yield of process excess sludge is low. The discovery provides a new theory and thought for biological denitrification of sewage. However, the anammox process can only denitrify and hardly removes phosphorus. However, the endogenous denitrification dephosphorization process performed under the anoxic condition can just meet the requirement of dephosphorization, and compared with the traditional dephosphorization process, the synchronous denitrification dephosphorization and dephosphorization not only reduces the requirement on a carbon source, realizes one-carbon dual-purpose, but also reduces the yield of the phosphorus-rich sludge. Therefore, for municipal sewage and nitrate wastewater with low C/N ratio, the synchronous denitrification and dephosphorization of the domestic sewage and the nitrate wastewater can be realized by denitrification dephosphorization, shortcut nitrification and dephosphorization and anaerobic ammonia oxidation. Firstly, denitrifyingThe phosphorus removal reactor stores an internal carbon source and releases phosphorus in an anaerobic section denitrifying phosphorus-accumulating bacteria, and the denitrifying phosphorus removal process is completed in an anoxic section by storing the internal carbon source in the denitrifying polysaccharide-accumulating bacteria; the short-cut nitrification A/O phosphorus removal reactor stores an internal carbon source in an anaerobic section phosphorus accumulating bacteria and releases phosphorus, the short-cut nitrification and phosphorus absorption processes are completed in an aerobic section, and finally the effluent of the denitrification phosphorus removal reactor and the effluent of the short-cut nitrification A/O phosphorus removal reactor enter the anaerobic ammonia oxidation reactor in a proper proportion to complete the denitrification process. Realizes the synchronous nitrogen and phosphorus removal of the domestic sewage and the nitrate wastewater.
Disclosure of Invention
The invention provides a device and a method for synchronously treating domestic sewage and nitrate wastewater by coupling denitrifying phosphorus removal with shortcut nitrification anaerobic ammonium oxidation, which realize that denitrifying phosphorus removal and shortcut nitrification A/O synchronous phosphorus removal parallel anaerobic ammonium oxidation technologies are jointly applied to deep nitrogen and phosphorus removal treatment of low C/N ratio municipal sewage and nitrate wastewater, and solve the prominent problems of insufficient carbon source, high residual sludge yield and the like in the nitrogen and phosphorus removal process of the traditional sewage treatment plant. The denitrification dephosphorization reactor and the shortcut nitrification A/O synchronous dephosphorization reactor have the functions of denitrification and dephosphorization while providing substrates for the anaerobic ammonia oxidation reactor, fully exert the advantages of anaerobic ammonia oxidation and denitrification dephosphorization processes, perform deep denitrification and dephosphorization, and have good treatment effect.
The purpose of the invention is solved by the following technical scheme: a device for synchronously treating domestic sewage and nitrate wastewater by using denitrification dephosphorization coupled with shortcut nitrification anaerobic ammonia oxidation is characterized in that:
comprises a municipal sewage raw water tank (1), a nitrate wastewater tank (2), a denitrification dephosphorization reactor (3), a first intermediate water tank (4), a short-cut nitrification A/O synchronous dephosphorization reactor (5), a second intermediate water tank (6), a third intermediate water tank (3), (7), an anaerobic ammonia oxidation reactor (8) and a water outlet tank (9); the municipal sewage is connected with a denitrification dephosphorization reactor (3) from a municipal sewage raw water tank (1) through a first water inlet pump (3.1), and the nitrate wastewater is connected with the denitrification dephosphorization reactor (3) from a nitrate wastewater tank (2) through a second water inlet pump (3.2); a first stirrer (3.3), a first DO/pH on-line measuring instrument (3.4), a first air compressor (3.5), a first rotor flowmeter (3.6), a first aeration disc (3.7) and a first drain valve (3.8) are arranged in the denitrification dephosphorization reactor (3); the effluent of the denitrification dephosphorization reactor (3) is discharged into a first intermediate water tank (4); the urban sewage is connected with a short-cut nitrification A/O synchronous dephosphorization reactor (5) through a third water inlet pump (5.1) by an urban sewage raw water tank (1); a second stirrer (5.2), a second DO/pH on-line determinator (5.3), a second air compressor (5.4), a second rotameter (5.5), a second aeration disc (5.6) and a second drain valve (5.7) are arranged in the short-cut nitrification A/O synchronous dephosphorization reactor (5); the effluent of the short-cut nitrification A/O synchronous dephosphorization reactor (5) is discharged into a second intermediate water tank (6); the first intermediate water tank (4) and the second intermediate water tank (6) are mixed into the third intermediate water tank (7) in a certain proper proportion, so that the mass ratio of nitrite nitrogen to ammonia nitrogen in the third intermediate water tank is 1-1.5, the third intermediate water tank (7) is connected with the anaerobic ammonia oxidation reactor (8) through a fourth water inlet pump (8.1), and the effluent of the anaerobic ammonia oxidation reactor (8) enters the water outlet tank (9) through a third water discharge valve (8.2).
The method for realizing synchronous nitrogen and phosphorus removal of domestic sewage and nitrate wastewater by using the device is characterized by comprising the following steps:
1) and (3) an operation stage:
1.1) sewage in the raw water tank (1) of urban sewage enters the denitrification dephosphorization reactor (3) through a first water inlet pump (3.1), the first stirrer (3.3) starts to stir when water enters the reactor and enters an anaerobic stage, and the denitrification dephosphorization reactor (3) is subjected to anaerobic stirring for 120-180 min; then, the sewage in the nitrate wastewater tank (2) enters the denitrification phosphorus removal reactor (3) through a second water inlet pump (3.2) to enter an anoxic stage, and the denitrification phosphorus removal reactor (3) is stirred for 120-inch stirring for 180 min; then, a first air compressor (3.5) is started to enter an aerobic stage, aerobic aeration is carried out for 15-60min, dissolved oxygen is adjusted to be 0.5-1mg/L through a first gas rotameter (3.6), precipitation and drainage are carried out for 40min after aeration and stirring are finished, the drainage ratio is 40-60%, and the drainage enters a first intermediate water tank (4); standing for 10-80min after draining water, and beginning the next period;
1.2) sewage in the raw water tank (1) of urban sewage enters a short-cut nitrification A/O synchronous phosphorus removal reactor (5) through a third water inlet pump (5.1), the second stirrer (5.2) starts stirring to enter an anaerobic stage while water enters, and the short-cut nitrification A/O synchronous phosphorus removal reactor (5) is subjected to anaerobic stirring for 60-120 min; then, a second air compressor (5.4) is started to enter an aerobic stage, aerobic aeration is carried out for 90-240min, dissolved oxygen is adjusted to be 3-5mg/L through a second gas rotameter, precipitation and drainage are carried out for 30min after aeration and stirring are finished, the drainage ratio is 40-60%, the drainage enters an intermediate water tank (6), the intermediate water tank is left unused for 10-80min, one period is finished, and then the next period is started;
1.3) mixing the first intermediate water tank (4) and the second intermediate water tank (6) into the third intermediate water tank (7) in a certain proper proportion, so that the mass ratio of nitrite nitrogen to ammonia nitrogen in the third intermediate water tank (7) is 1-1.5, continuously feeding the third intermediate water tank (7) into an anaerobic ammonia oxidation reactor (8) through a fourth water inlet pump (8.1), and feeding the third intermediate water tank into a water outlet tank (9) through a third water outlet valve (8.2).
Sludge needs to be discharged when the denitrification phosphorus removal reactor (3) and the short-cut nitrification A/O synchronous phosphorus removal reactor (5) run, and the sludge concentration of the denitrification phosphorus removal reactor (3) is maintained within the range of 2500 +/-300 mg/L; when the short-cut nitrification A/O synchronous phosphorus removal reactor (5) runs, the concentration of sludge in the reactor is maintained at 2500 +/-300 mg/L, and the sludge age is controlled to be 15-25 days.
The invention has the following advantages:
1) the advantages of denitrification dephosphorization, partial nitrification and anaerobic ammonia oxidation are combined, and synchronous denitrification dephosphorization of the domestic sewage and the nitrate wastewater under the condition of low C/N ratio is realized;
2) organic matters of raw water are fully utilized, the carbon source of the denitrification dephosphorization reactor is used for storing an internal carbon source for denitrification dephosphorization, the carbon source of the short-cut nitrification A/O synchronous dephosphorization reactor is used for dephosphorization and denitrification after drainage, and low C/N sewage can be treated;
3) the denitrifying phosphorus accumulating bacteria, the nitrifying bacteria and the anaerobic ammonium oxidation bacteria are separated, and all microbial floras are in good living environments, so that efficient operation of all systems is facilitated;
4) the device has good adaptation effect on water quality fluctuation, and avoids the influence caused by water quality change through water quantity control.
In conclusion, the invention realizes the synchronous nitrogen and phosphorus removal of the municipal domestic sewage and the nitrate wastewater, and has the advantages of low operation energy consumption, cost saving, less greenhouse gas generation, low sludge yield, stable system treatment effect and the like.
Drawings
FIG. 1 is a schematic diagram of simultaneous treatment of domestic sewage and nitrate wastewater by denitrifying phosphorus removal coupled with partial nitrification and anaerobic ammonia oxidation.
In fig. 1: 1-city sewage raw water tank; 2-nitrate wastewater tank; 3-denitrifying dephosphatation reactor; 3.1-first water intake pump; 3.2-a second water inlet pump; 3.3-first stirrer; 3.4-first DO/pH on-line analyzer; 3.5-first air compressor; 3.6-first rotameter; 3.7-the first aeration disc; 3.8-first drain valve; 4-first intermediate tank; 5-short-cut nitrification A/O synchronous dephosphorization reactor; 5.1-third water inlet pump; 5.2-a second stirrer; 5.3-second DO/pH on-line analyzer; 5.4-a second air compressor; 5.5-second rotameter; 5.6-the second aeration disc; 5.7-second drain valve; 6-second intermediate tank; 7-third intermediate tank; 8-anaerobic ammoxidation reactor; 8.1-a fourth water inlet pump; 8.2-third drain valve; 9-water outlet tank.
FIG. 2 is a timing diagram illustrating the operation of the denitrification dephosphorization reactor;
FIG. 3 is a timing diagram of the operation of the short-cut nitrification A/O dephosphorization reactor.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples:
as shown in figure 1, a device for synchronously treating domestic sewage and nitrate wastewater by coupling denitrification dephosphorization with partial nitrification and anaerobic treatment is composed of a municipal sewage raw water tank (1), a nitrate wastewater tank (2), a denitrification dephosphorization reactor (3), a first intermediate water tank (4), a partial nitrification A/O synchronous dephosphorization reactor (5), a second intermediate water tank (6), a third intermediate water tank (3) (7), an anaerobic ammonia oxidation reactor (8) and a water outlet tank (9); the municipal sewage is connected with a denitrification dephosphorization reactor (3) from a municipal sewage raw water tank (1) through a first water inlet pump (3.1), and the nitrate wastewater is connected with the denitrification dephosphorization reactor (3) from a nitrate wastewater tank (2) through a second water inlet pump (3.2); the effluent of the denitrification dephosphorization reactor (3) is discharged into a first intermediate water tank (4); the urban sewage is connected with a short-cut nitrification A/O synchronous dephosphorization reactor (5) through a third water inlet pump (5.1) by an urban sewage raw water tank (1); the effluent of the short-cut nitrification A/O synchronous dephosphorization reactor (5) is discharged into a second intermediate water tank (6); the first intermediate water tank (4) and the second intermediate water tank (6) are mixed into the third intermediate water tank (7) in a certain proper proportion, so that the mass ratio of nitrite nitrogen to ammonia nitrogen in the third intermediate water tank is 1-1.5, the third intermediate water tank (7) is connected with the anaerobic ammonia oxidation reactor (8) through a fourth water inlet pump (8.1), and the effluent of the anaerobic ammonia oxidation reactor (8) enters the water outlet tank (9) through a third water discharge valve (8.2).
The experiment adopts domestic sewage and nitrate nitrogen water distribution in family members of Beijing university of industry, and the specific water quality is as follows: domestic sewage: the COD concentration is 166-296mg/L, NH4 +-N concentration 58-87mg/L, NO2 --N≤2mg/L，NO3 -N is less than or equal to 1.5 mg/L; water distribution of nitrate and nitrogen: NO3 —The N concentration was 2800-3700 mg/L. The experimental system is shown in figure 1, each reactor is made of organic glass, and the total volume of the denitrification dephosphorization reactor is 11L, wherein the effective volume is 10L; the total volume of the short-cut nitrification A/O synchronous dephosphorization reactor is 11L, wherein the effective volume is 10L; the total volume of the anaerobic ammonia oxidation reactor is 5L, and the effective volume is 3L.
The specific operation is as follows:
1) and (3) an operation stage:
1.1) sewage in the raw water tank (1) of urban sewage enters the denitrification dephosphorization reactor (3) through a first water inlet pump (3.1), the first stirrer (3.3) starts to stir when water enters the reactor and enters an anaerobic stage, and the denitrification dephosphorization reactor (3) is subjected to anaerobic stirring for 120-180 min; then, the sewage in the nitrate wastewater tank (2) enters the denitrification phosphorus removal reactor (3) through a second water inlet pump (3.2) to enter an anoxic stage, and the denitrification phosphorus removal reactor (3) is stirred for 120-inch stirring for 180 min; then, a first air compressor (3.5) is started to enter an aerobic stage, aerobic aeration is carried out for 15-60min, dissolved oxygen is adjusted to be 0.5-1mg/L through a first gas rotameter (3.6), precipitation and drainage are carried out for 40min after aeration and stirring are finished, the drainage ratio is 40-60%, and the drainage enters a first intermediate water tank (4); standing for 10-80min after draining water, and beginning the next period;
1.2) sewage in the raw water tank (1) of urban sewage enters a short-cut nitrification A/O synchronous phosphorus removal reactor (5) through a third water inlet pump (5.1), the second stirrer (5.2) starts stirring to enter an anaerobic stage while water enters, and the short-cut nitrification A/O synchronous phosphorus removal reactor (5) is subjected to anaerobic stirring for 60-120 min; then, a second air compressor (5.4) is started to enter an aerobic stage, aerobic aeration is carried out for 90-240min, dissolved oxygen is adjusted to be 3-5mg/L through a second gas rotameter, precipitation and drainage are carried out for 30min after aeration and stirring are finished, the drainage ratio is 40-60%, the drainage enters an intermediate water tank (6), the intermediate water tank is left unused for 10-80min, one period is finished, and then the next period is started;
1.3) mixing the first intermediate water tank (4) and the second intermediate water tank (6) into the third intermediate water tank (7) in a certain proper proportion, so that the mass ratio of nitrite nitrogen to ammonia nitrogen in the third intermediate water tank (7) is 1-1.5, continuously feeding the third intermediate water tank (7) into the anaerobic ammonia oxidation reactor (8) through a fourth water inlet pump (8.1), and feeding the third intermediate water tank into a water outlet tank (9) through a third water outlet valve (8.2).
Sludge needs to be discharged when the denitrification phosphorus removal reactor (3) and the short-cut nitrification A/O synchronous phosphorus removal reactor (5) run, and the sludge concentration of the denitrification phosphorus removal reactor (3) is maintained within the range of 2500 +/-300 mg/L; when the short-cut nitrification A/O synchronous phosphorus removal reactor (5) runs, the concentration of sludge in the reactor is maintained at 2500 +/-300 mg/L, and the sludge age is controlled to be 15-25 days.
The test result shows that: after the operation is stable, the average COD and NH of the effluent4 +-N,NO3 --N,NO2 -The N, TN concentrations are respectively as follows: 37.04mg/L, 1.02mg/L, 7.28mg/L, 0.68mg/L and 8.56mg/L, and the water outlet indexes are stable and all reach the national first-class A standard.
The foregoing is a detailed description of the invention that will enable those skilled in the art to better understand and utilize the invention, and it is not to be limited thereby, since various modifications and changes may be made by those skilled in the art without departing from the scope of the invention.
Claims (2)
1. A device for synchronously treating domestic sewage and nitrate wastewater by using denitrification dephosphorization coupled with shortcut nitrification anaerobic ammonia oxidation is characterized in that:
comprises a municipal sewage raw water tank (1), a nitrate wastewater tank (2), a denitrification dephosphorization reactor (3), a first intermediate water tank (4), a short-cut nitrification A/O synchronous dephosphorization reactor (5), a second intermediate water tank (6), a third intermediate water tank (3), (7), an anaerobic ammonia oxidation reactor (8) and a water outlet tank (9); the municipal sewage is connected with a denitrification dephosphorization reactor (3) from a municipal sewage raw water tank (1) through a first water inlet pump (3.1), and the nitrate wastewater is connected with the denitrification dephosphorization reactor (3) from a nitrate wastewater tank (2) through a second water inlet pump (3.2); a first stirrer (3.3), a first DO/pH on-line measuring instrument (3.4), a first air compressor (3.5), a first rotor flowmeter (3.6), a first aeration disc (3.7) and a first drain valve (3.8) are arranged in the denitrification dephosphorization reactor (3); the effluent of the denitrification dephosphorization reactor (3) is discharged into a first intermediate water tank (4); the urban sewage is connected with a short-cut nitrification A/O synchronous dephosphorization reactor (5) through a third water inlet pump (5.1) by an urban sewage raw water tank (1); a second stirrer (5.2), a second DO/pH on-line determinator (5.3), a second air compressor (5.4), a second rotameter (5.5), a second aeration disc (5.6) and a second drain valve (5.7) are arranged in the short-cut nitrification A/O synchronous dephosphorization reactor (5); the effluent of the short-cut nitrification A/O synchronous dephosphorization reactor (5) is discharged into a second intermediate water tank (6); the first intermediate water tank (4) and the second intermediate water tank (6) are mixed into the third intermediate water tank (7) in a certain proper proportion, so that the mass ratio of nitrite nitrogen to ammonia nitrogen in the third intermediate water tank is 1-1.5, the third intermediate water tank (7) is connected with the anaerobic ammonia oxidation reactor (8) through a fourth water inlet pump (8.1), and the effluent of the anaerobic ammonia oxidation reactor (8) enters the water outlet tank (9) through a third water discharge valve (8.2).
2. The method for realizing synchronous nitrogen and phosphorus removal of domestic sewage and nitrate wastewater by using the device of claim 1 is characterized by comprising the following steps:
1) and (3) an operation stage:
1.1) sewage in the raw water tank (1) of urban sewage enters the denitrification dephosphorization reactor (3) through a first water inlet pump (3.1), the first stirrer (3.3) starts to stir when water enters the reactor and enters an anaerobic stage, and the denitrification dephosphorization reactor (3) is subjected to anaerobic stirring for 120-180 min; then, the sewage in the nitrate wastewater tank (2) enters the denitrification phosphorus removal reactor (3) through a second water inlet pump (3.2) to enter an anoxic stage, and the denitrification phosphorus removal reactor (3) is stirred for 120-inch stirring for 180 min; then, a first air compressor (3.5) is started to enter an aerobic stage, aerobic aeration is carried out for 15-60min, dissolved oxygen is adjusted to be 0.5-1mg/L through a first gas rotameter (3.6), precipitation and drainage are carried out for 40min after aeration and stirring are finished, the drainage ratio is 40-60%, and the drainage enters a first intermediate water tank (4); standing for 10-80min after draining water, and beginning the next period;
1.2) sewage in the raw water tank (1) of urban sewage enters a short-cut nitrification A/O synchronous phosphorus removal reactor (5) through a third water inlet pump (5.1), the second stirrer (5.2) starts stirring to enter an anaerobic stage while water enters, and the short-cut nitrification A/O synchronous phosphorus removal reactor (5) is subjected to anaerobic stirring for 60-120 min; then, a second air compressor (5.4) is started to enter an aerobic stage, aerobic aeration is carried out for 90-240min, dissolved oxygen is adjusted to be 3-5mg/L through a second gas rotameter, precipitation and drainage are carried out for 30min after aeration and stirring are finished, the drainage ratio is 40-60%, the drainage enters an intermediate water tank (6), the intermediate water tank is left unused for 10-80min, one period is finished, and then the next period is started;
1.3) mixing a first intermediate water tank (4) and a second intermediate water tank (6) into a third intermediate water tank (7) in a certain proper proportion, so that the mass ratio of nitrite nitrogen to ammonia nitrogen in the third intermediate water tank (7) is 1-1.5, and the third intermediate water tank (7) continuously enters an anaerobic ammonia oxidation reactor (8) through a fourth water inlet pump (8.1) and enters a water outlet tank (9) through a third water outlet valve (8.2);
sludge needs to be discharged when the denitrification phosphorus removal reactor (3) and the short-cut nitrification A/O synchronous phosphorus removal reactor (5) run, and the sludge concentration of the denitrification phosphorus removal reactor (3) is maintained within the range of 2500 +/-300 mg/L; when the short-cut nitrification A/O synchronous phosphorus removal reactor (5) runs, the concentration of sludge in the reactor is maintained at 2500 +/-300 mg/L, and the sludge age is controlled to be 15-25 days.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114229995A (en) * | 2021-12-24 | 2022-03-25 | 成都理工大学 | System and process for synchronous denitrification and carbon removal of pig raising wastewater |
| CN115353192A (en) * | 2022-09-16 | 2022-11-18 | 北京工业大学 | Device and method for realizing synchronous deep denitrification and phosphorus recovery of municipal sewage in unstable shortcut nitrification anaerobic ammonia oxidation reactor |
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