CN114772725B - Device and method for enhancing denitrification and dephosphorization of domestic sewage by coupling sulfur autotrophic short-cut denitrification and anaerobic ammoxidation - Google Patents
Device and method for enhancing denitrification and dephosphorization of domestic sewage by coupling sulfur autotrophic short-cut denitrification and anaerobic ammoxidation Download PDFInfo
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 239000010865 sewage Substances 0.000 title claims abstract description 81
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 73
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 69
- 239000011593 sulfur Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000008878 coupling Effects 0.000 title claims abstract description 12
- 238000010168 coupling process Methods 0.000 title claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 12
- 230000002708 enhancing effect Effects 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 118
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 116
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 58
- 230000003647 oxidation Effects 0.000 claims abstract description 58
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 58
- 239000010802 sludge Substances 0.000 claims abstract description 44
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 21
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 14
- 239000011574 phosphorus Substances 0.000 claims abstract description 14
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 11
- 231100000719 pollutant Toxicity 0.000 claims abstract description 11
- 239000008187 granular material Substances 0.000 claims abstract description 10
- 238000011010 flushing procedure Methods 0.000 claims description 20
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 18
- 238000010992 reflux Methods 0.000 claims description 18
- 238000005273 aeration Methods 0.000 claims description 16
- 235000015097 nutrients Nutrition 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 241000894006 Bacteria Species 0.000 claims description 12
- 239000005864 Sulphur Substances 0.000 claims description 12
- 238000011081 inoculation Methods 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 8
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- 230000000813 microbial effect Effects 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 238000012806 monitoring device Methods 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 3
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 239000011550 stock solution Substances 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims 1
- 239000000945 filler Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 claims 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims 1
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims 1
- 235000013619 trace mineral Nutrition 0.000 claims 1
- 239000011573 trace mineral Substances 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 26
- 230000008569 process Effects 0.000 abstract description 17
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 238000012163 sequencing technique Methods 0.000 abstract 2
- 229910021646 siderite Inorganic materials 0.000 abstract 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 238000013019 agitation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- -1 S 2- Chemical compound 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F3/302—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
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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Abstract
A device and a method for enhancing nitrogen and phosphorus removal of domestic sewage by coupling sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation belong to the field of urban domestic sewage treatment by an activated sludge process. The device comprises a water tank, a Sequencing Batch Reactor (SBR), a sulfur autotrophic denitrification anaerobic ammonia oxidation biological filter, an air compressor, a water inlet pump and the like. The method is that the low C/N domestic sewage is treated by anaerobic and aerobic stages of a sequencing batch reactor to remove organic matters and phosphorus in the sewage. The secondary treatment effluent of urban sewage treatment plants taking nitrate nitrogen as a main pollutant and the effluent of SBR are pumped into a sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter according to a proportion, elemental sulfur of sulfur granule filter materials (composed of sulfur and siderite) is taken as an electron donor, and autotrophic denitrification is carried out through a sulfur autotrophic short-range denitrification coupling anaerobic ammonia oxidation way. The invention can further remove nitrate nitrogen of secondary treatment effluent of urban sewage treatment plants, and can realize the ultimate denitrification of domestic sewage under the condition of no additional carbon source.
Description
Technical field:
the invention relates to a device and a method for enhancing nitrogen and phosphorus removal of domestic sewage by coupling sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation, belonging to the field of urban domestic sewage treatment by an activated sludge process. The method is suitable for the efficient, energy-saving denitrification and dephosphorization process of urban domestic sewage.
The background technology is as follows:
with the current rapid development of national economy and the continuous growth of population, the water pollution problem is increasingly serious. The water body is in an eutrophication state due to the gradual aggravation of nitrogen and phosphorus pollution, which seriously affects the environment and the health of human beings. Biological nitrogen and phosphorus removal is widely used in sewage treatment plants as a cost effective means. The traditional biological denitrification process is that nitrifying bacteria convert ammonia nitrogen into nitrogen under the aerobic condition, heterotrophic denitrifying bacteria convert the nitrogen into nitrogen under the anoxic condition, and the removal of nitrogen in water is realized. Traditional biological dephosphorization refers to removing phosphate in water by utilizing the characteristic of aerobic excessive phosphorus absorption of phosphorus accumulating bacteria under anaerobic and aerobic running conditions. The two processes both use organic matters as carbon sources, but because the urban sewage has the characteristic of low C/N, the requirements of denitrification and dephosphorization are difficult to be met at the same time, so that the improvement and upgrading of the traditional biological denitrification and dephosphorization process are very important.
In recent years, anaerobic ammonia oxidation (Anammox) has received extensive attention from researchers as a novel biological autotrophic nitrogen removal process. In the process, ammonia nitrogen directly reacts with nitrite nitrogen under the anoxic condition to generate nitrogen. The stable supply of nitrite nitrogen is critical to the performance of the Anammox process. Short-cut denitrification refers to controlling the traditional whole-course denitrification process in the production stage of nitrite nitrogen, avoiding further reduction of nitrite nitrogen into nitrogen, and providing a reaction substrate for Anamox. At present, research has reported that sulfur autotrophic denitrification technology, autotrophic denitrifying Sulfur Oxidizing Bacteria (SOB) can utilize reduced sulfur (e.g., S 2- ，S 0 ，S 2 O 3 2- ) As an electron donor, nitrate or nitrite is reduced to nitrogen, the technology can realize autotrophic denitrification without a carbon source, and accumulation of nitrite nitrogen is often observed in a sulfur-driven autotrophic denitrification system, which provides opportunities for providing nitrite nitrogen to anaerobic ammonia oxidizing bacteria.
Therefore, we propose a device method for strengthening denitrification and dephosphorization of domestic sewage by coupling sulfur autotrophic short-cut denitrification and anaerobic ammoxidation, which takes secondary treatment effluent of urban domestic sewage and urban sewage treatment plants as a research object, and low-C/N domestic sewage reaches the purposes of removing organic matters and biologically dephosphorizing through anaerobic and aerobic stages of SBR. The pollutants in the secondary treatment effluent of the urban sewage treatment plant are mainly nitrate nitrogen, the nitrate nitrogen and the effluent of the SBR are pumped into a sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter in proportion, elemental sulfur in a sulfur granule filter material is used as an electron donor, and the sulfur autotrophic short-range denitrification and the anaerobic ammonia oxidation denitrification process are combined to carry out biological denitrification. The device and the method can be used as an advanced treatment technology to further remove nitrate nitrogen of secondary treatment effluent of urban sewage treatment plants, and can realize the ultimate denitrification of domestic sewage under the condition of no external carbon source.
Disclosure of Invention
Utilize sulphur autotrophic short range denitrification coupling anaerobic ammonia oxidation to strengthen domestic sewage denitrification dephosphorization's device, its characterized in that: the domestic sewage tank (1) is connected with the SBR (3) through a first water inlet pump (2), and a stirrer (4) and a dissolved oxygen monitoring device (6) are arranged in the SBR (3); an aeration disc (7) in the SBR (3) is connected with the first air compressor (5); the SBR (3) is connected with the intermediate water tank (9) through a first water outlet valve (8); the middle water tank (9) and the secondary treatment water outlet water tank (10) of the urban sewage treatment plant are respectively connected with the sulfur autotrophic short-distance denitrification anaerobic ammonia oxidation biological filter (13) through a third water inlet pump (12) and a second water inlet pump (11); the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter (13) is connected with an exhaust valve (20) and is subjected to reverse air washing through a second air compressor (17); the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter (13) is sequentially provided with a supporting layer (such as cobbles) and sulfur granule filter materials from bottom to top, and effluent is connected with an effluent tank (14) through a second effluent valve (18); the water outlet tank (14) is connected with the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux; the effluent in the effluent tank (14) can be used as backwash water to backwash the filter material in the reaction device through a backwash pump (16), and the backwash wastewater is discharged through a third water outlet valve (19).
The device for strengthening the denitrification and dephosphorization of the domestic sewage by utilizing the coupling of the sulfur autotrophic short-range denitrification and the anaerobic ammoxidation comprises the following steps: the full-process nitrified sludge of a sewage treatment plant is used as inoculation sludge to be injected into SBR, the concentration of the sludge after inoculation is kept between 3000 and 3500mg/L, the actual domestic sewage with low C/N (less than 3) is used as raw water to enter the SBR through a first water inlet pump to realize a high-load activated sludge method, a reactor runs in an anaerobic/aerobic (A/O) mode, the reactor runs for 5 to 6 cycles each day, each cycle comprises water inlet for 10 minutes, anaerobic stirring for 0.5 to 1.5 hours, aeration for 0.5 to 1.5 hours, precipitation for 0.5 hours, water discharge for 10 minutes and idle for 60 to 230 minutes, the dissolved oxygen of an aerobic section is kept between 2 and 2.5mg/L by a real-time control device, the water discharge ratio is kept at 50%, and the removal of raw water organic matters and phosphorus is realized in the SBR. The method comprises the steps that pollutants in SBR effluent are mainly ammonia nitrogen, the pollutants in secondary treatment effluent of urban sewage treatment plants are mainly nitrate nitrogen, the two are pumped into a sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter tank through a water inlet in a volume ratio of 1:4, sulfur autotrophic denitrifying bacteria utilize elemental sulfur in sulfur granule filter materials as electron donors to carry out sulfur autotrophic short-range denitrification, reaction substrate nitrite nitrogen is provided for anaerobic ammonia oxidation, hydraulic retention time is 1-3 h, synchronous removal of nitrate nitrogen in secondary treatment effluent of urban sewage treatment plants and ammonia nitrogen in domestic sewage is completed, and effluent reaches the standard and is discharged.
The invention is realized by the following technical scheme:
1) System start-up
1.1 Start-up of SBR: injecting the whole-course nitrified sludge of the sewage treatment plant into the SBR (3) as inoculated sludge, keeping the concentration of the inoculated sludge at 3000-3500 mg/L, discharging the sludge once every two days to control the retention time of the sludge to 25d, and running the sewage treatment plant at room temperature for 3-6 h; the method is characterized in that the actual domestic sewage is used as raw water to be injected into a domestic sewage tank (1), SBR (3) is injected through a first water inlet pump (2), the operation is carried out for 5-6 cycles each day, each cycle comprises water inlet for 10min, anaerobic stirring for 0.5-1.5 h, aeration for 0.5-1.5 h, precipitation for 0.5h, water drainage for 10min and idling for 60-230 min, and the water drainage ratio is maintained at 50%. When the pollutant in the effluent is mainly ammonia nitrogen, the removal rate of phosphate and COD reaches more than 90 percent, and the SBR is stably operated for 15 days and more, and the SBR is considered to be successfully started.
1.2 Sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter is started: under the room temperature environment, sulphur granule filter materials are added into a filter tank to keep the height of a filter material layer at 1-1.2 m, activated sludge of an anoxic tank of a sewage treatment plant and anaerobic ammonia oxidation floc sludge are used as inoculation sludge, the inoculation sludge is mixed according to the volume ratio of 1:1, the concentration of the sludge after inoculation is kept at 4000-5000 mg/L, sulphur autotrophic denitrifying bacteria strains are injected into a sulphur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter tank (13), ammonia nitrogen and nitrate nitrogen are distributed as mixed nutrient solution, the mixed nutrient solution is pumped into the bottom of the reactor by a pump from a water inlet, the mixed nutrient solution flows out from a water outlet and then enters a water outlet tank (14) and is pumped into the reactor from the water inlet, the mixed nutrient solution is circularly pumped into the reactor, and the microbial domestication and the film hanging are carried out on the biological filter tank until the nitrate nitrogen removal rate is basically stabilized at 80%, namely the film hanging is successful, and the startup of the sulphur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter tank (13) is completed. The nutrient solution in the step (2) comprises the following components in percentage by weight: ammonium chloride (NH) 4 Cl,30 mg/L), potassium nitrate (KNO) 3 40 mg/L), sodium bicarbonate (NaHCO) 3 2 g/L), magnesium sulfate (MgSO) 4 ·7H 2 O,0.14 g/L), calcium chloride (CaCl) 2 ·2H 2 O,0.14 g/L), potassium dihydrogen phosphate (KH) 2 PO 4 0.03 g/L) and microelement stock solution required by microorganism growth, and the starting treatment time of the biological filter is 30-50 d.
2) Operation of the system
2.1 SBR operation:
SBR is operated for 5 to 6 cycles per day and is operated anaerobically/aerobically, each cycle comprising 6 processes of water intake, anaerobic agitation, aeration agitation, precipitation, drainage and idling, sludge discharge is carried out once every two days to control sludge retention time to 25d.
I, the water inflow is set to be 50% of the effective volume of the reactor, a water inflow switch is controlled by a time control switch, and after the system is started, the domestic sewage in the domestic sewage tank (1) is pumped into the SBR (3) by a first water inflow pump (2);
II, anaerobic stirring: after water inflow is completed, anaerobic stirring is started, and stirring time is set to be 0.5-1.5 h;
III, aeration stirring: starting a first air compressor (5), aerating the SBR, providing oxygen, maintaining the dissolved oxygen at 2-2.5 mg/L by a real-time control device, and setting the aeration time at 0.5-1.5 h.
IV precipitation: setting the sedimentation time to be 0.5h, and separating mud from water;
v, draining: setting the drainage time to be 10min and the drainage ratio to be 50%; directly pumping SBR effluent mainly containing ammonia nitrogen into a sulfur autotrophic short-range denitrification biological filter through a peristaltic pump;
VI, idle: setting the idle time to be 60-230 min;
2.2 Sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter: after the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) is started, pumping the secondary treatment effluent of the urban sewage treatment plant and the effluent of the SBR into the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) which is started in the step 1.2) according to the ratio of 1:4 through a water inlet, adjusting the hydraulic retention time to be 1-3 h, and completing synchronous removal of nitrate nitrogen in the secondary treatment effluent of the urban sewage treatment plant and ammonia nitrogen in domestic sewage, wherein the effluent reaches the standard and is discharged. Part of the effluent in the effluent tank (14) is connected with the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux, and the reflux ratio is 100-300%.
2.3 Back flushing process of the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter: after the biological filter is stably operated for a period of time, the biological film on the filter material thickens to a certain degree and begins to fall off to a certain extent, the microbial activity and the denitrification efficiency of the effluent are reduced, and when the denitrification efficiency of the effluent is reduced by 5% or more, the operation is stopped and back flushing is performed. The effluent in the effluent tank (14) can be used as backwash water to backwash the filter material in the reaction device by a backwash pump (16), when the backwash is carried out, the air-flushing duration is 3min, and the air-flushing strength is 10-15L/(m) 2 S) and then carrying out gas-water combined flushing for 5min, wherein the water flushing strength is 7-10L/(m) 2 S) and finally flushing for 3min, and discharging the backwashed waste water through a third water outlet valve (19).
In summary, the invention provides a method and a device for deep denitrification and dephosphorization by coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation. The secondary treatment effluent of urban domestic sewage and urban sewage treatment plants is taken as a research object, the domestic sewage with low C/N (less than 3) is pumped into SBR, phosphorus accumulating bacteria firstly perform anaerobic phosphorus release in an anaerobic section, aeration is performed in an aerobic section, the phosphorus accumulating bacteria perform aerobic excessive phosphorus absorption, and meanwhile heterotrophic bacteria remove organic matters in the domestic sewage, so that the aim of removing the organic matters and phosphorus in the domestic sewage is fulfilled, and effluent pollutants mainly comprise ammonia nitrogen. The pollutants in the secondary treatment effluent of the urban sewage treatment plant are mainly nitrate nitrogen, the nitrate nitrogen and the effluent of the SBR are pumped into a sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter in proportion, the sulfur autotrophic short-range denitrification and the anaerobic ammonia oxidation denitrification process are combined to carry out biological denitrification, the total nitrogen removal effect on low-C/N (< 3) domestic sewage is better, and the biological denitrification and dephosphorization treatment device and method without adding an additional organic carbon source are provided.
Description of the drawings:
FIG. 1 is a schematic diagram of a device structure for enhancing denitrification and dephosphorization of domestic sewage by coupling sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation.
(1) a domestic sewage water tank, (2) a first water inlet pump, (3) SBR, (4) a stirrer, (5) a first air compressor, (6) a dissolved oxygen monitoring device, (7) an aeration disc, (8) a first water outlet valve, (9) an intermediate water tank, and (10) a secondary treatment water outlet water tank of a town sewage treatment plant, the device comprises a first water inlet pump, a second water inlet pump, a third water inlet pump, a sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter, a back-flushing pump, a second air compressor, a third water outlet valve and an emptying valve.
FIG. 2 is a schematic diagram illustrating the operation of the reactor.
The specific embodiment is as follows:
as shown in FIG. 1, each reactor is made of organic glass, the total volume of the SBR reactor (3) is 11L, and the effective volume is 10L; the total volume of the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter (13) is 12L, and the effective volume is 7.8L.
In the test process, the specific water quality of the secondary treatment effluent of the urban sewage treatment plant is as follows: COD concentration is 25-30 mg/L, NO 3 - N concentration is 15-20 mg/L, NH 4 + N concentration < 1mg/L, NO 2 - -N concentration < 1mg/L; the specific water quality of the domestic sewage is as follows: COD concentration is 80-200 mg/L, NH 4 + The concentration of the-N is 45-70 mg/L, NO 2 - N concentration < 1mg/L, NO 3 - The concentration of the N is 15-20 mg/L.
The invention is further described with reference to the drawings and the implementation: the device and the method for enhancing the denitrification and dephosphorization of the domestic sewage by coupling the autotrophic short-cut denitrification and the anaerobic ammoxidation are characterized in that: the domestic sewage tank (1) is connected with the SBR (3) through a first water inlet pump (2), and a stirrer (4) and a dissolved oxygen monitoring device (6) are arranged in the SBR (3); an aeration disc (7) in the SBR (3) is connected with the first air compressor (5); the SBR (3) is connected with the intermediate water tank (9) through a first water outlet valve (8); the middle water tank (9) and the secondary treatment water outlet water tank (10) of the urban sewage treatment plant are respectively connected with the sulfur autotrophic short-distance denitrification anaerobic ammonia oxidation biological filter (13) through a third water inlet pump (12) and a second water inlet pump (11); the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter (13) is connected with an exhaust valve (20) and is subjected to reverse air washing through a second air compressor (17); the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter (13) is sequentially provided with a supporting layer (such as cobbles) and sulfur granule filter materials from bottom to top, and effluent is connected with an effluent tank (14) through a second effluent valve (18); the water outlet tank (14) is connected with the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux; the effluent in the effluent tank (14) can be used as backwash water to backwash the filter material in the reaction device through a backwash pump (16), and the backwash wastewater is discharged through a third water outlet valve (19).
The specific implementation steps are as follows:
1) System start-up
1.1 Start-up of SBR: injecting the whole-course nitrified sludge of the sewage treatment plant into the SBR (3) as inoculated sludge, keeping the concentration of the inoculated sludge at 3000-3500 mg/L, discharging the sludge once every two days to control the retention time of the sludge to 25d, and running the sewage treatment plant at room temperature for 3-6 h; the method is characterized in that the actual domestic sewage is used as raw water to be injected into a domestic sewage tank (1), SBR (3) is injected through a first water inlet pump (2), the operation is carried out for 5-6 cycles each day, each cycle comprises water inlet for 10min, anaerobic stirring for 0.5-1.5 h, aeration for 0.5-1.5 h, precipitation for 0.5h, water drainage for 10min and idling for 60-230 min, and the water drainage ratio is maintained at 50%. When the pollutant in the effluent is mainly ammonia nitrogen, the removal rate of phosphate and COD reaches more than 90 percent, and the SBR is stably operated for 15 days and more, and the SBR is considered to be successfully started.
1.2 Sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter is started: under the room temperature environment, sulphur granule filter materials are added into a filter tank to keep the height of the filter material layer at 1-1.2 m, activated sludge in an anoxic tank of a sewage treatment plant and anaerobic ammonia oxidation floc sludge are used as inoculation sludge, the inoculation sludge is mixed according to the volume ratio of 1:1, the concentration of the sludge after inoculation is kept at 4000-5000 mg/L, sulphur autotrophic denitrifying bacteria strains are injected into a sulphur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter tank (13), ammonia nitrogen and nitrate nitrogen are distributed as mixed nutrient solution, and a pump is usedThe mixed nutrient solution is pumped into the bottom of the reactor from the water inlet, flows out from the water outlet, enters the water outlet tank (14), is pumped into the reactor from the water inlet, is circularly pumped in, carries out microbial domestication and film hanging on the biological filter until the nitrate nitrogen removal rate is basically stabilized at 80%, namely film hanging is successful, and completes the startup of the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13). The nutrient solution in the step (2) comprises the following components in percentage by weight: ammonium chloride (NH) 4 Cl,30 mg/L), potassium nitrate (KNO) 3 40 mg/L), sodium bicarbonate (NaHCO) 3 2 g/L), magnesium sulfate (MgSO) 4 ·7H 2 O,0.14 g/L), calcium chloride (CaCl) 2 ·2H 2 O,0.14 g/L), potassium dihydrogen phosphate (KH) 2 PO 4 0.03 g/L) and microelement stock solution required by microorganism growth, and the starting treatment time of the biological filter is 30-50 d.
2) Operation of the system
2.1 SBR operation:
SBR is operated for 5 to 6 cycles per day and is operated anaerobically/aerobically, each cycle comprising 6 processes of water intake, anaerobic agitation, aeration agitation, precipitation, drainage and idling, sludge discharge is carried out once every two days to control sludge retention time to 25d.
I, the water inflow is set to be 50% of the effective volume of the reactor, a water inflow switch is controlled by a time control switch, and after the system is started, the domestic sewage in the domestic sewage tank (1) is pumped into the SBR (3) by a first water inflow pump (2);
II, anaerobic stirring: after water inflow is completed, anaerobic stirring is started, and stirring time is set to be 0.5-1.5 h;
III, aeration stirring: starting a first air compressor (5), aerating the SBR, providing oxygen, maintaining the dissolved oxygen at 2-2.5 mg/L by a real-time control device, and setting the aeration time at 0.5-1.5 h.
IV precipitation: setting the sedimentation time to be 0.5h, and separating mud from water;
v, draining: setting the drainage time to be 10min and the drainage ratio to be 50%; directly pumping SBR effluent mainly containing ammonia nitrogen into a sulfur autotrophic short-range denitrification biological filter through a peristaltic pump;
VI, idle: setting the idle time to be 60-230 min;
2.2 Sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter: after the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) is started, pumping the secondary treatment effluent of the urban sewage treatment plant and the effluent of the SBR into the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) which is started in the step 1.2) according to the ratio of 1:4 through a water inlet, adjusting the hydraulic retention time to be 1-3 h, and completing synchronous removal of nitrate nitrogen in the secondary treatment effluent of the urban sewage treatment plant and ammonia nitrogen in domestic sewage, wherein the effluent reaches the standard and is discharged. Part of the effluent in the effluent tank (14) is connected with the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux, and the reflux ratio is 100-300%.
2.3 Back flushing process of the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter: after the biological filter is stably operated for a period of time, the biological film on the filter material thickens to a certain degree and begins to fall off to a certain extent, the microbial activity and the denitrification efficiency of the effluent are reduced, and when the denitrification efficiency of the effluent is reduced by 5% or more, the operation is stopped and back flushing is performed. The effluent in the effluent tank (14) can be used as backwash water to backwash the filter material in the reaction device by a backwash pump (16), when the backwash is carried out, the air-flushing duration is 3min, and the air-flushing strength is 10-15L/(m) 2 S) and then carrying out gas-water combined flushing for 5min, wherein the water flushing strength is 7-10L/(m) 2 S) and finally flushing for 3min, and discharging the backwashed waste water through a third water outlet valve (19).
Claims (1)
1. The method for strengthening the denitrification and dephosphorization of the domestic sewage by utilizing the coupling of the sulfur autotrophic short-cut denitrification and the anaerobic ammoxidation is characterized in that the device used by the method is specifically as follows: the domestic sewage tank (1) is connected with the SBR (3) through a first water inlet pump (2), and a stirrer (4) and a dissolved oxygen monitoring device (6) are arranged in the SBR (3); an aeration disc (7) in the SBR (3) is connected with the first air compressor (5); the SBR (3) is connected with the intermediate water tank (9) through a first water outlet valve (8); the middle water tank (9) and the secondary treatment water outlet water tank (10) of the urban sewage treatment plant are respectively connected with the sulfur autotrophic short-distance denitrification anaerobic ammonia oxidation biological filter (13) through a third water inlet pump (12) and a second water inlet pump (11); the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter (13) is connected with an exhaust valve (20) and is subjected to reverse air washing through a second air compressor (17); the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter (13) is sequentially provided with a supporting layer and sulfur granule filter materials from bottom to top, and effluent is connected with an effluent tank (14) through a second water outlet valve (18); the water outlet tank (14) is connected with the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux; the effluent in the effluent tank (14) can be used as backwash water to backwash the filter material in the reaction device through a backwash pump (16), and the backwash wastewater is discharged through a third water outlet valve (19);
the method comprises the following steps:
injecting the full-process nitrified sludge of the sewage treatment plant as inoculated sludge into SBR, wherein the concentration of the inoculated sludge is kept at 3000-3500 mg/L, the actual domestic sewage with the C/N less than 3 is used as raw water, the raw water enters the SBR through a first water inlet pump to realize a high-load activated sludge method, the SBR runs in an anaerobic/aerobic mode for 5-6 cycles each day, each cycle comprises water inlet for 10min, anaerobic stirring for 0.5-1.5 h, aeration for 0.5-1.5 h, precipitation for 0.5h, water drainage for 10min and idle for 60-230 min, the dissolved oxygen of an aerobic section is kept at 2-2.5 mg/L through a real-time control device, the water drainage ratio is kept at 50%, and the removal of organic matters and phosphorus in the SBR is realized;
the method comprises the steps that pollutants in SBR effluent mainly comprise ammonia nitrogen, pollutants in secondary treatment effluent of urban sewage treatment plants mainly comprise nitrate nitrogen, the nitrate nitrogen and the nitrate nitrogen are pumped into a sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter tank through a water inlet in a volume ratio of 1:4, sulfur autotrophic denitrifying bacteria utilize elemental sulfur in sulfur granule filter materials as electron donors to perform sulfur autotrophic short-range denitrification, reaction substrate nitrite nitrogen is provided for anaerobic ammonia oxidation, hydraulic retention time is 1-3 h, synchronous removal of nitrate nitrogen in secondary treatment effluent of urban sewage treatment plants and ammonia nitrogen in domestic sewage is completed, and effluent reaches the standard; the water outlet tank is connected with the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter through a reflux pump to carry out reflux, and the reflux ratio is 100% -300%; when the denitrification efficiency of the effluent is reduced by 5% or more after the biological filter is operated for a period of time, the impurities trapped in the filter material layer are required to be removed by back flushing, the effluent in the effluent tank can be used as back flushing water to back flush the filler in the reaction device through a back flushing pump, and when back flushing is carried out, the method of gas-water combined flushing is adopted, and the back flushed waste water is directly discharged through a drain valve; starting SBR: injecting the whole-course nitrified sludge of the sewage treatment plant into SBR (3) as inoculated sludge, keeping the concentration of the inoculated sludge at 3000-3500 mg/L, discharging the sludge once every two days to control the sludge retention time to be 25d, and running the sewage treatment plant at room temperature for 3-6 h; injecting actual domestic sewage serving as raw water into a domestic sewage tank (1), injecting SBR (3) through a first water inlet pump (2), and operating for 5-6 cycles each day, wherein each cycle comprises water inlet for 10min, anaerobic stirring for 0.5-1.5 h, aeration for 0.5-1.5 h, precipitation for 0.5h, water drainage for 10min and idle for 60-230 min, and the water drainage ratio is maintained at 50%; when the pollutant in the effluent is mainly ammonia nitrogen, the removal rate of phosphate and COD reaches more than 90 percent, and the SBR is stably operated for 15 days and more, and is considered to be successful in starting;
starting a sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter: under the room temperature environment, sulphur granule filter materials are added into a filter tank to keep the height of a filter material layer at 1-1.2 m, activated sludge in an anoxic tank of a sewage treatment plant and anaerobic ammonia oxidation floc sludge are used as inoculation sludge, the inoculation sludge is mixed according to the volume ratio of 1:1, the concentration of the sludge after inoculation is kept at 4000-5000 mg/L, sulphur autotrophic denitrifying bacteria strains are injected into a sulphur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter tank (13), ammonia nitrogen and nitrate nitrogen are distributed as mixed nutrient solution, the mixed nutrient solution is pumped into the bottom of the reactor by a pump from a water inlet, the mixed nutrient solution flows out from a water outlet and then enters a water outlet tank (14) and is pumped into the reactor from the water inlet, the mixed nutrient solution is circularly pumped into the reactor, and microbial domestication and film hanging are carried out on the biological filter tank until the nitrate nitrogen removal rate is stabilized at 80%, namely film hanging is successful, and the startup of the sulphur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter tank (13) is completed; the nutrient solution comprises the following components in percentage by weight: 30-mg/L of ammonium chloride, 40-mg/L of potassium nitrate, 2-g/L of sodium bicarbonate, 0.14-g/L of magnesium sulfate, 0.14-g/L of calcium chloride, 0.03-g/L of monopotassium phosphate and trace element stock solution required by microbial growth, wherein the starting treatment time of a biological filter is 30-50 d;
operation of a sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter: after the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) is started, pumping secondary treatment effluent of the urban sewage treatment plant and effluent of the SBR into the started sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) according to the ratio of 1:4 through a water inlet, adjusting the hydraulic retention time to be 1-3 h, and completing synchronous removal of nitrate nitrogen in the secondary treatment effluent of the urban sewage treatment plant and ammonia nitrogen in domestic sewage, wherein the effluent reaches the standard and is discharged; part of effluent in the effluent tank (14) is connected with the sulfur autotrophic short-range denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux, and the reflux ratio is 100% -300%.
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