CN108439599B - Device and method for deep nitrogen and phosphorus removal by coupling endogenous short-cut denitrification with ANAMMOX of municipal domestic sewage - Google Patents
Device and method for deep nitrogen and phosphorus removal by coupling endogenous short-cut denitrification with ANAMMOX of municipal domestic sewage Download PDFInfo
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Abstract
An endogenous short-cut denitrification coupling ANAMMOX deep nitrogen and phosphorus removal device and method for municipal domestic sewage, belonging to the field of municipal sewage biological treatment. The device mainly comprises a raw water tank, an AOA reactor, a secondary sedimentation tank, a first intermediate water tank, a dephosphorization SBR, a second intermediate water tank and an ANAMMOX-UASB; the method comprises the following steps: part of domestic sewage and return sludge of the secondary sedimentation tank firstly enter an anaerobic zone of the AOA reactor to carry out anaerobic phosphorus release and store an internal carbon source; then the mixed solution enters an aerobic zone of the AOA reactor to carry out phosphorus absorption and nitration reactions; then the mixed liquor enters an anoxic zone to generate endogenous short-range denitrification, then the mixed liquor enters a secondary sedimentation tank to carry out mud-water separation, and the supernatant enters a first intermediate water tank; part of domestic sewage enters into a dephosphorization SBR, and supernatant enters into a second intermediate water tank after static sedimentation; and the effluent of the first intermediate water tank and the effluent of the second intermediate water tank enter ANAMMOX-UASB for anaerobic ammonia oxidation reaction. The invention can realize deep denitrification of the domestic sewage with low C/N ratio by strengthening the storage of the internal carbon source of the sludge.
Description
Technical Field
The invention relates to a device and a method for deep nitrogen and phosphorus removal by endogenous short-cut denitrification coupling ANAMMOX in municipal domestic sewage, belongs to the technical field of sewage treatment, and is suitable for the fields of sewage treatment such as upgrading and modification of newly-built municipal sewage treatment plants or old water plants, treatment of municipal domestic sewage and industrial wastewater and the like.
Background
In sewage treatment, the removal of nitrogen is the most troublesome problem of sewage solution, and is also the key for realizing the deep treatment and standard discharge of sewage. The classification according to the sewage denitrification principle can be divided into physical and chemical denitrification and biological denitrification. Compared with a physical chemical method, the biological method has the characteristics of economy, high efficiency and wide application range in the treatment of the nitrogen-containing wastewater, and simultaneously, the biological denitrification technology has great development potential, so that the most reasonable and feasible measure for removing the nitrogen in the sewage is only the biological denitrification.
The anammox reaction is a reaction in which anammox bacteria reduce nitrite nitrogen into nitrogen by taking ammonia nitrogen as an electron donor under an anoxic condition. Anaerobic ammonia oxidation is an efficient biological denitrification process, and has good development and application prospects due to high volume removal efficiency. People begin to research on the anaerobic ammonia oxidation process at the end of the 20 th century, and successfully develop the anaerobic ammonia oxidation process at the beginning of the 21 st century, so that many successful cases exist in the denitrification treatment of high-concentration ammonia nitrogen wastewater such as garbage percolate, sludge digestive juice and the like at present.
Short-cut denitrification is the reaction of nitrate Nitrogen (NO)3 --N) is nitrite Nitrogen (NO)2 -N), compared with the short-cut nitrification, the short-cut denitrification is less influenced by external environment change, and the nitrite accumulation can be realized more stably, so that a substrate is provided for the anaerobic ammonia oxidation reaction. Compared with the traditional complete denitrification, the short-cut denitrification has the advantages of high nitrogen conversion rate, low sludge yield, low carbon source demand and the like; endogenous denitrification refers to a process in which heterotrophic denitrifying bacteria reduce nitrate nitrogen or nitrite nitrogen into nitrogen gas by using endogenous substances stored in vivo as electron donors. The municipal sewage contains a large amount of ammonia nitrogen and can be used as one of substrates of anaerobic ammonia oxidation reaction, but the content of nitrite nitrogen in domestic sewage is very low, and the carbon source in the sewage can be fully utilized to obtain the nitrite nitrogen by adopting endogenous short-range denitrification. Therefore, the efficient treatment of the sewage can be realized by utilizing the endogenous short-cut denitrification coupled with the anaerobic ammonia oxidation.
Disclosure of Invention
The invention provides a device and a method for treating domestic sewage by endogenous short-range denitrification coupling anaerobic ammonia oxidation. By adopting an anaerobic/aerobic/anoxic AOA operation mode, the storage capacity of a carbon source in the sludge is enhanced, the ineffective consumption of the carbon source in the aerobic aeration process is reduced to the maximum extent, and the carbon source is effectively utilized; the removal of phosphorus can be realized through anaerobic phosphorus release, aerobic phosphorus absorption and residual sludge discharge; the biological filler in the aerobic zone provides good attachment conditions for enrichment of nitrifying bacteria with long sludge age, and ensures the nitrification effect of the system; the denitrifying bacteria in the anoxic environment utilize the self-stored internal carbon source to carry out short-range denitrification, so that the adding cost of the external carbon source is saved; the anaerobic ammonia oxidation reaction realizes the synchronous removal of ammonia nitrogen and nitrite nitrogen in the domestic sewage, and the continuous flow operation mode improves the treatment load.
The device is characterized by comprising a raw water tank (1), an AOA bioreactor (2), a secondary sedimentation tank (3), a first intermediate water tank (4), a dephosphorization SBR reactor (6), a second intermediate water tank (6.8) and a UASB reactor (5) which are connected in sequence; the AOA bioreactor (2) comprises a first anaerobic zone (2.1.1), a second anaerobic zone (2.1.2), a first aerobic zone (2.2.1), a second aerobic zone (2.2.2), a third aerobic zone (2.2.3), a first anoxic zone (2.3.1) and a second anoxic zone (2.3.2) in sequence; the raw water tank (1) is connected with the first anaerobic zone (2.1.1) through a first water inlet pump (1.1), the second anaerobic zone (2.1.2) is connected with the first aerobic zone (2.2.1), and the third aerobic zone (2.2.3) is connected with the first anoxic zone (2.3.1); the second anoxic zone (2.3.2) is connected with the secondary sedimentation tank (3) through an overflow pipe; the bottom of the secondary sedimentation tank (3) is connected with the first anaerobic zone (2.1.1) through a sludge reflux pump (3.1), and the effluent of the secondary sedimentation tank (3) enters a first intermediate water tank (4); the raw water tank (1) is connected with the phosphorus removal SBR reactor (6) through a second water inlet pump (6.1), a second middle water tank (6.8) is connected with the phosphorus removal SBR reactor (6) through a drain valve (6.4), the UASB reactor (5) is connected with the first middle water tank (4) through a third water inlet pump (5.1), the UASB reactor (5) is connected with the second middle water tank (6.8) through a fourth water inlet pump (5.3), and the UASB reactor (5) also performs reflux through an internal reflux pump (5.2); in the AOA bioreactor (2), a first anaerobic zone (2.1.1), a second anaerobic zone (2.1.2), a first anoxic zone (2.3.1) and a second anoxic zone (2.3.2) are all provided with a first stirrer (2.4), a first aeration pump (2.5) is connected with a first aeration head (2.7) in the first aerobic zone (2.2.1), the second aerobic zone (2.2.2) and the third aerobic zone (2.2.3) through a first rotor flow meter (2.6), and a suspension is placed in the first aerobic zone (2.2.1), the second aerobic zone (2.2.2) and the third aerobic zone (2.2.3)The floating polyethylene biological filler (2.8) has the specific surface density of 450-2/m3The filling ratio of the filler is 30-40%; the dephosphorization SBR reactor (6) is provided with a second stirrer (6.2) and a second aeration head (6.7), and a second aeration pump (6.5) is connected with the second aeration head (6.7) through a second rotameter (6.6).
Method for applying the device according to claim 1, comprising the steps of:
1) part of domestic sewage enters a first anaerobic zone (2.1.1) of an AOA bioreactor (2) from a raw water tank (1) through a first water inlet pump (1.1), and simultaneously enters return sludge pumped back from the bottom of a secondary sedimentation tank (3) through a sludge return pump (3.1), the hydraulic retention time of the anaerobic zone is controlled to be 2-2.5h, internal carbon source storage is carried out, and anaerobic phosphorus release reaction occurs;
2) the mixed solution enters a first aerobic zone (2.2.1) from a second anaerobic zone (2.1.2), the concentration of dissolved oxygen is controlled to be 4-6mg/L through a first rotor flow meter (2.6), the hydraulic retention time of the aerobic zone is controlled to be 3-4h, aerobic phosphorus absorption is carried out, and the nitration reaction is completed;
3) the mixed liquor enters a first anoxic zone (2.3.1) from a third aerobic zone (2.2.3), the hydraulic retention time is controlled to be 1-2h, an internal carbon source stored in the anaerobic zone is utilized to carry out endogenous short-range denitrification reaction, and nitrate nitrogen generated in the aerobic zone is reduced into nitrite nitrogen;
4) mixed liquor enters a secondary sedimentation tank (3) from a second anoxic zone (2.3) through an overflow pipe to realize the purpose of mud-water separation, supernatant in the secondary sedimentation tank (3) enters an intermediate water tank (4), sludge at the bottom of the secondary sedimentation tank (3) returns to a first anaerobic zone (2.1.1) through a sludge reflux pump (3.1), and the sludge reflux ratio is 70-100%;
5) part of domestic sewage enters a phosphorus removal SBR reactor (6) through a second water inlet pump (6.1), a second stirrer (6.2) starts stirring, phosphorus accumulating bacteria utilize volatile fatty acid in raw water to synthesize an internal carbon source, and simultaneously the phosphorus accumulating bacteria release phosphate in the body to the outside of the body; at the stage, DO in the dephosphorization SBR reactor (6) is controlled to be less than or equal to 0.02mg/L, ORP is-150 to-250 mv, pH is 6.5 to 7.5, and the reaction time is 2 to 2.5 h; after the anaerobic reaction is finished, a second aeration pump (6.5) is started to carry out aerobic phosphorus absorption reaction, DO in the phosphorus removal SBR reactor (6) is controlled to be 1-2mg/L at the stage, the reaction time is 2-3h, after the reaction is finished, standing and precipitating are carried out, and supernate enters a second intermediate water tank (6.8) through a drain valve (6.4)
6) The stored water in the first intermediate water tank (4) is pumped into a UASB reactor (5) through a third water inlet pump (5.1), the stored water in the second intermediate water tank (6.8) is pumped into the UASB reactor (5) through a fourth water inlet pump (5.3) for anaerobic ammonia oxidation reaction, the hydraulic retention time is controlled for 4-5h, and the anaerobic ammonia oxidation reaction effluent is discharged as final drainage water through a water outlet (5.4);
keeping the concentration of activated sludge in the AOA bioreactor at 2000-3000mg/L and controlling the sludge age at 10-14 days; the concentration of activated sludge in the phosphorus removal SBR reactor is kept at 2000-3000mg/L, and the sludge age is controlled at 10-14 days.
The invention aims to provide a device and a method for deep nitrogen and phosphorus removal, which have the following advantages:
1) phosphorus accumulating bacteria are enriched in the activated sludge in the continuous flow reactor, and nitrifying bacteria are enriched and grown on the biological membrane, so that the problem of sludge age contradiction between the phosphorus accumulating bacteria and the nitrifying bacteria is solved;
2) the anaerobic/aerobic/anoxic operation mode of the continuous flow strengthens the storage capacity of the carbon source in the sludge, reduces the ineffective consumption of the carbon source in the aeration process and saves the addition of the carbon source in the subsequent denitrification process;
3) the operation mode of the continuous flow and the operation of the anaerobic ammonia oxidation reaction realize the deep denitrification of the sewage, improve the treatment load and have convenient operation;
drawings
FIG. 1 is a device for deep nitrogen and phosphorus removal by coupling short-cut denitrification with ANAMMOX in municipal domestic sewage.
In fig. 1: 1-raw water tank; 1.1-a first water inlet pump; 2-AOA bioreactor; 2.1.1-a first anaerobic zone; 2.1.2-a second anaerobic zone; 2.2.1-a first aerobic zone; 2.2.2-a second aerobic zone; 2.2.3-a third aerobic zone; 2.3.1-first anoxic zone; 2.3.2-a second anoxic zone; 2.4-a first stirrer; 2.5-a first aeration pump; 2.6-first rotameter; 2.7-a first aeration head; 2.8-polyethylene bio-filler; 3-secondary sedimentation tank; 3.1-sludge reflux pump; 4-a first intermediate water tank; 5-UASB reactor; 5.1-a third water inlet pump; 5.2-reflux pump; 5.3-a fourth water inlet pump; 5.4-UASB water outlet; 6-dephosphorization SBR reactor; 6.1-a second water inlet pump; 6.2-second stirrer; 6.3-mud valve; 6.4-drain valve; 6.5-a second aeration pump; 6.6-second rotameter; 6.7-a second aeration head; 6.8-second intermediate tank
Detailed Description
An embodiment of the present invention is illustrated in detail with reference to fig. 1:
1) part of domestic sewage enters a first anaerobic zone (2.1.1) of an AOA bioreactor (2) from a raw water tank (1) through a first water inlet pump (1.1), and simultaneously enters return sludge pumped back from the bottom of a secondary sedimentation tank (3) through a sludge return pump (3.1), the hydraulic retention time of the anaerobic zone is controlled to be 2-2.5h, internal carbon source storage is carried out, and anaerobic phosphorus release reaction occurs;
2) the mixed solution enters a first aerobic zone (2.2.1) from a second anaerobic zone (2.1.2), the concentration of dissolved oxygen is controlled to be 4-6mg/L through a first rotor flow meter (2.6), the hydraulic retention time of the aerobic zone is controlled to be 3-4h, aerobic phosphorus absorption is carried out, and the nitration reaction is completed;
3) the mixed liquor enters a first anoxic zone (2.3.1) from a third aerobic zone (2.2.3), the hydraulic retention time is controlled to be 1-2h, an internal carbon source stored in the anaerobic zone is utilized to carry out endogenous short-range denitrification reaction, and nitrate nitrogen generated in the aerobic zone is reduced into nitrite nitrogen;
4) mixed liquor enters a secondary sedimentation tank (3) from a second anoxic zone (2.3) through an overflow pipe to realize the purpose of mud-water separation, supernatant in the secondary sedimentation tank (3) enters an intermediate water tank (4), sludge at the bottom of the secondary sedimentation tank (3) returns to a first anaerobic zone (2.1.1) through a sludge reflux pump (3.1), and the sludge reflux ratio is 70-100%;
5) part of domestic sewage enters a phosphorus removal SBR reactor (6) through a second water inlet pump (6.1), a second stirrer (6.2) starts stirring, phosphorus accumulating bacteria utilize volatile fatty acid in raw water to synthesize an internal carbon source, and simultaneously the phosphorus accumulating bacteria release phosphate in the body to the outside of the body; at the stage, DO in the dephosphorization SBR reactor (6) is controlled to be less than or equal to 0.02mg/L, ORP is-150 to-250 mv, pH is 6.5 to 7.5, and the reaction time is 2 to 2.5 h; after the anaerobic reaction is finished, a second aeration pump (6.5) is started to carry out aerobic phosphorus absorption reaction, DO in the phosphorus removal SBR reactor (6) is controlled to be 1-2mg/L at the stage, the reaction time is 2-3h, after the reaction is finished, standing and precipitating are carried out, and supernate enters a second intermediate water tank (6.8) through a drain valve (6.4)
6) The stored water in the first intermediate water tank (4) is pumped into a UASB reactor (5) through a third water inlet pump (5.1), the stored water in the second intermediate water tank (6.8) is pumped into the UASB reactor (5) through a fourth water inlet pump (5.3) for anaerobic ammonia oxidation reaction, the hydraulic retention time is controlled for 4-5h, and the anaerobic ammonia oxidation reaction effluent is discharged as final drainage water through a water outlet (5.4);
keeping the concentration of activated sludge in the AOA bioreactor at 2000-3000mg/L and controlling the sludge age at 10-14 days; the concentration of activated sludge in the phosphorus removal SBR reactor is kept at 2000-3000mg/L, and the sludge age is controlled at 10-14 days.
The domestic sewage of a family area of a college in Beijing is taken as a treatment object, and the nitrogen and phosphorus removal performance of the system is examined.
Test results show that under the condition of stable operation of the system, the COD concentration of the effluent is 25-45mg/L, and NH is added4 +-N concentration 0-4mg/L, NO3 -The concentration of-N is 3-10mg/L, and the concentration of TN is less than 15mg/L, thereby reaching the national first-class A discharge standard of sewage.
Claims (2)
1. An endogenous short-cut denitrification coupling ANAMMOX deep nitrogen and phosphorus removal device for municipal domestic sewage is characterized by comprising a raw water tank (1), an AOA bioreactor (2), a secondary sedimentation tank (3), a first intermediate water tank (4), a phosphorus removal SBR reactor (6), a second intermediate water tank (6.8) and a UASB reactor (5) which are sequentially connected; the AOA bioreactor (2) comprises a first anaerobic zone (2.1.1), a second anaerobic zone (2.1.2), a first aerobic zone (2.2.1), a second aerobic zone (2.2.2), a third aerobic zone (2.2.3), a first anoxic zone (2.3.1) and a second anoxic zone (2.3.2) in sequence; the raw water tank (1) is connected with the first anaerobic zone (2.1.1) through a first water inlet pump (1.1), the second anaerobic zone (2.1.2) is connected with the first aerobic zone (2.2.1), and the third aerobic zone (2.2.3) is connected with the first anoxic zone (2.3.1); the second anoxic zone (2.3.2) is connected with the secondary sedimentation tank (3) through an overflow pipe; the bottom of the secondary sedimentation tank (3) is connected with the first anaerobic zone (2.1.1) through a sludge reflux pump (3.1), and the effluent of the secondary sedimentation tank (3) enters the first middleA water tank (4); the raw water tank (1) is connected with the phosphorus removal SBR reactor (6) through a second water inlet pump (6.1), a second middle water tank (6.8) is connected with the phosphorus removal SBR reactor (6) through a drain valve (6.4), the UASB reactor (5) is connected with the first middle water tank (4) through a third water inlet pump (5.1), the UASB reactor (5) is connected with the second middle water tank (6.8) through a fourth water inlet pump (5.3), and the UASB reactor (5) also performs reflux through an internal reflux pump (5.2); in the AOA bioreactor (2), a first anaerobic zone (2.1.1), a second anaerobic zone (2.1.2), a first anoxic zone (2.3.1) and a second anoxic zone (2.3.2) are respectively provided with a first stirrer (2.4), a first aeration pump (2.5) is connected with a first aeration head (2.7) in the first aerobic zone (2.2.1), the second aerobic zone (2.2.2) and the third aerobic zone (2.2.3) through a first rotameter (2.6), a suspended polyethylene biological filler (2.8) is placed in the first aerobic zone (2.2.1), the second aerobic zone (2.2.2) and the third aerobic zone (2.2.3), and the specific surface density is 450-charge 500m2/m3The filling ratio of the filler is 30-40%; the dephosphorization SBR reactor (6) is provided with a second stirrer (6.2) and a second aeration head (6.7), and a second aeration pump (6.5) is connected with the second aeration head (6.7) through a second rotameter (6.6).
2. Method for applying the device according to claim 1, comprising the steps of:
1) part of domestic sewage enters a first anaerobic zone (2.1.1) of an AOA bioreactor (2) from a raw water tank (1) through a first water inlet pump (1.1), and simultaneously enters return sludge pumped back from the bottom of a secondary sedimentation tank (3) through a sludge return pump (3.1), the hydraulic retention time of the anaerobic zone is controlled to be 2-2.5h, internal carbon source storage is carried out, and anaerobic phosphorus release reaction occurs;
2) the mixed solution enters a first aerobic zone (2.2.1) from a second anaerobic zone (2.1.2), the concentration of dissolved oxygen is controlled to be 4-6mg/L through a first rotor flow meter (2.6), the hydraulic retention time of the aerobic zone is controlled to be 3-4h, aerobic phosphorus absorption is carried out, and the nitration reaction is completed;
3) the mixed liquor enters a first anoxic zone (2.3.1) from a third aerobic zone (2.2.3), the hydraulic retention time is controlled to be 1-2h, an internal carbon source stored in the anaerobic zone is utilized to carry out endogenous short-range denitrification reaction, and nitrate nitrogen generated in the aerobic zone is reduced into nitrite nitrogen;
4) the mixed liquor enters a secondary sedimentation tank (3) from a second anoxic zone (2.3.2) through an overflow pipe to realize the purpose of mud-water separation, supernatant in the secondary sedimentation tank (3) enters a first intermediate water tank (4), sludge at the bottom of the secondary sedimentation tank (3) returns to a first anaerobic zone (2.1.1) through a sludge reflux pump (3.1), and the sludge reflux ratio is 70-100%;
5) part of domestic sewage enters a phosphorus removal SBR reactor (6) through a second water inlet pump (6.1), a second stirrer (6.2) starts stirring, phosphorus accumulating bacteria utilize volatile fatty acid in raw water to synthesize an internal carbon source, and simultaneously the phosphorus accumulating bacteria release phosphate in the body to the outside of the body; at the stage, DO in the dephosphorization SBR reactor (6) is controlled to be less than or equal to 0.02mg/L, ORP is-150 to-250 mv, pH is 6.5 to 7.5, and the reaction time is 2 to 2.5 h; after the anaerobic reaction is finished, a second aeration pump (6.5) is started to carry out aerobic phosphorus absorption reaction, DO in the phosphorus removal SBR reactor (6) is controlled to be 1-2mg/L at the stage, the reaction time is 2-3h, after the reaction is finished, standing and precipitating are carried out, and supernatant enters a second intermediate water tank (6.8) through a drain valve (6.4);
6) the stored water in the first intermediate water tank (4) is pumped into a UASB reactor (5) through a third water inlet pump (5.1), the stored water in the second intermediate water tank (6.8) is pumped into the UASB reactor (5) through a fourth water inlet pump (5.3) for anaerobic ammonia oxidation reaction, the hydraulic retention time is controlled for 4-5h, and the anaerobic ammonia oxidation reaction effluent is discharged as final drainage water through a water outlet (5.4);
keeping the concentration of activated sludge in the AOA bioreactor at 2000-3000mg/L and controlling the sludge age at 10-14 days; the concentration of activated sludge in the phosphorus removal SBR reactor is kept at 2000-3000mg/L, and the sludge age is controlled at 10-14 days.
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