CN114772725A - Device and method for enhancing nitrogen and phosphorus removal of domestic sewage by coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation - Google Patents
Device and method for enhancing nitrogen and phosphorus removal of domestic sewage by coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation Download PDFInfo
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 73
- 239000011593 sulfur Substances 0.000 title claims abstract description 73
- 239000010865 sewage Substances 0.000 title claims abstract description 71
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 63
- 230000003647 oxidation Effects 0.000 title claims abstract description 55
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 55
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 52
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 37
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 27
- 239000011574 phosphorus Substances 0.000 title claims abstract description 27
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 24
- 230000008878 coupling Effects 0.000 title claims abstract description 10
- 238000010168 coupling process Methods 0.000 title claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 10
- 230000002708 enhancing effect Effects 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000010802 sludge Substances 0.000 claims abstract description 33
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 31
- 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 21
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 10
- 231100000719 pollutant Toxicity 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000012163 sequencing technique Methods 0.000 claims abstract description 5
- 238000010992 reflux Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 238000005273 aeration Methods 0.000 claims description 15
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 15
- 238000011001 backwashing Methods 0.000 claims description 11
- 241000894006 Bacteria Species 0.000 claims description 10
- 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
- 238000011081 inoculation Methods 0.000 claims description 9
- 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
- 238000004062 sedimentation Methods 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 3
- 239000005864 Sulphur Substances 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 238000005728 strengthening Methods 0.000 abstract description 5
- 239000005416 organic matter Substances 0.000 abstract 1
- 229910021646 siderite Inorganic materials 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 10
- 235000015097 nutrients Nutrition 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- 238000011010 flushing procedure Methods 0.000 description 8
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 230000003203 everyday effect Effects 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- -1 S)2- Chemical compound 0.000 description 3
- 230000032770 biofilm formation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 235000010333 potassium nitrate Nutrition 0.000 description 2
- 239000004323 potassium nitrate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 241000108664 Nitrobacteria Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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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
- 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
-
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
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- 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
-
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- 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
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- C02F3/308—Biological phosphorus removal
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- C02F2101/105—Phosphorus compounds
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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Abstract
A device and a method for strengthening nitrogen and phosphorus removal of domestic sewage by coupling sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation belong to the field of activated sludge process urban domestic sewage treatment. The device comprises a water tank, a Sequencing Batch Reactor (SBR), a sulfur autotrophic denitrification anaerobic ammonium oxidation biological filter, an air compressor, a water inlet pump and the like. The method is that low C/N domestic sewage is treated through anaerobic and aerobic stages in a sequencing batch reactor to eliminate organic matter and phosphorus in the sewage. The secondary treatment effluent of a town sewage treatment plant taking nitrate nitrogen as a main pollutant and the effluent of SBR are pumped into a sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter in proportion, and elemental sulfur of a sulfur particle filter material (consisting of sulfur and siderite) is taken as an electron donor to carry out autotrophic nitrogen removal through a sulfur autotrophic short-cut denitrification coupling anaerobic ammonia oxidation path. The invention can further remove nitrate nitrogen in secondary treatment effluent of the urban sewage treatment plant, and realize the limit denitrification of domestic sewage under the condition of no external carbon source.
Description
The technical field is as follows:
the invention relates to a device and a method for strengthening nitrogen and phosphorus removal of domestic sewage by coupling sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation, belonging to the field of activated sludge process urban domestic sewage treatment. The method is suitable for the high-efficiency and energy-saving nitrogen and phosphorus removal process of the urban domestic sewage.
The background art comprises the following steps:
with the rapid development of national economy and the continuous increase of population quantity in China at present, the problem of water pollution is increasingly serious. The water body is in a eutrophication state due to the gradual increase of nitrogen and phosphorus pollution, which seriously affects the environment and human health. Biological nitrogen and phosphorus removal is widely applied to sewage treatment plants as an economical and effective mode. In the traditional biological denitrification process, nitrobacteria convert ammonia nitrogen into nitrate nitrogen under the aerobic condition, and heterotrophic denitrifying bacteria convert nitrate nitrogen into nitrogen under the anoxic condition, so that the nitrogen in water is removed. The traditional biological phosphorus removal method is to remove phosphate in a water body by utilizing the characteristic that phosphorus-accumulating bacteria excessively absorb phosphorus under the anaerobic and aerobic operating conditions. The two processes all use organic matters as carbon sources, but the urban sewage has the characteristic of low C/N and is difficult to meet the requirements of nitrogen and phosphorus removal at the same time, so that the improvement and upgrading of the traditional biological nitrogen and phosphorus removal process are very important.
In recent years, Anammox (Anammox) has received much attention from researchers as a novel bioautotrophic denitrification process. In the process, ammonia nitrogen directly reacts with nitrite nitrogen under an anoxic condition to generate nitrogen. The stable supply of nitrous nitrogen is critical to the implementation of the Anammox process. The short-cut denitrification refers to the control of the traditional whole-cut denitrification process in the generation stage of nitrite nitrogen, so that the nitrite nitrogen is prevented from being further reduced into nitrogen, and the reaction substrate nitrite nitrogen can be provided for Anammox. At present, research has reported that sulfur autotrophic denitrification technology, autotrophic denitrifying Sulfur Oxidizing Bacteria (SOB) can utilize reduced sulfur (e.g., S)2-，S0，S2O3 2-) The technology can realize autotrophic denitrification without a carbon source by reducing nitrate or nitrite into nitrogen as an electron donor, and the accumulation of nitrite nitrogen can be often observed in a sulfur-driven autotrophic denitrification system, which is used for providing nitrite nitrogen for anaerobic ammonia oxidizing bacteriaProviding opportunities.
Therefore, the method for strengthening the nitrogen and phosphorus removal of the domestic sewage by coupling the sulfur autotrophic short-cut denitrification and the anaerobic ammonia oxidation takes the municipal domestic sewage and the secondary treatment effluent of a municipal sewage treatment plant as research objects, and the low-C/N domestic sewage achieves the purposes of removing organic matters and biologically removing phosphorus through the anaerobic and aerobic stages of SBR. The pollutants in the secondary treatment effluent of the urban sewage treatment plant mainly comprise nitrate nitrogen, the nitrate nitrogen and the effluent of SBR are pumped into a sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter according to a proportion, elemental sulfur in a sulfur particle filter material is used as an electron donor, and the sulfur autotrophic short-cut denitrification and the anaerobic ammonia oxidation denitrification process are combined for biological denitrification. The device and the method can be used as an advanced treatment technology to further remove nitrate nitrogen in secondary treatment effluent of a municipal sewage treatment plant, and realize the limit denitrification of domestic sewage without an external carbon source.
Disclosure of Invention
Utilize the autotrophy short distance denitrification of sulphur to couple the device that the anaerobic ammonia oxidation strengthens domestic sewage nitrogen and phosphorus removal, its characterized in that: the domestic sewage water tank (1) is connected with an SBR (sequencing batch reactor) (3) through a first water inlet pump (2), and a stirrer (4) and a dissolved oxygen monitoring device (6) are installed in the SBR (3); an aeration disc (7) in the SBR (3) is connected with a first air compressor (5); the SBR (3) is connected with the middle water tank (9) through a first water outlet valve (8); the intermediate water tank (9) and a secondary treatment water outlet tank (10) of a town sewage treatment plant are respectively connected with a sulfur autotrophic short-cut denitrification anaerobic ammonium 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 emptying valve (20) and is subjected to reverse gas washing by a second air compressor (17); the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) is sequentially provided with a supporting layer (such as cobblestones) and a sulfur particle filter material 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-cut denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux; the outlet water in the outlet water tank (14) can be used as backwash water to backwash the filter material in the reaction device through a backwash pump (16), and the wastewater after backwash is discharged through a third outlet valve (19).
The device for strengthening the nitrogen and phosphorus removal of the domestic sewage by coupling the sulfur autotrophic short-cut denitrification and the anaerobic ammonia oxidation comprises the following steps: the method is characterized in that full-course nitrified sludge of a sewage treatment plant is used as inoculated sludge and is injected into SBR, after inoculation, the sludge concentration is kept at 3000-3500 mg/L, actual domestic sewage with low C/N (less than 3) is used as raw water and enters 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, 5-6 periods run every day, each period comprises water inlet 10min, anaerobic stirring 0.5-1.5 h, aeration 0.5-1.5 h, sedimentation 0.5h, water drainage 10min and idling 60-230 min, dissolved oxygen in 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 organic matters and phosphorus are removed in the SBR. The pollutants in the SBR effluent mainly comprise ammonia nitrogen, the pollutants in the secondary treatment effluent of the urban sewage treatment plant mainly comprise nitrate nitrogen, the nitrate nitrogen and the sulfur are pumped into a sulfur autotrophic short-range denitrification anaerobic ammonium oxidation biological filter through a water inlet according to the volume ratio of 1:4, sulfur autotrophic denitrification bacteria use elemental sulfur in a sulfur particle filter material as an electron donor to perform sulfur autotrophic short-range denitrification to provide reaction substrate nitrite nitrogen for anaerobic ammonium oxidation, the hydraulic retention time is 1-3 h, synchronous removal of the nitrate nitrogen in the secondary treatment effluent of the urban sewage treatment plant and the ammonia nitrogen in domestic sewage is completed, and the effluent is discharged after reaching the standard.
The invention is realized by the following technical scheme:
1) startup of system
1.1) starting of SBR: injecting the whole-course nitrified sludge of the sewage treatment plant into SBR (3) as inoculated sludge, keeping the sludge concentration at 3000-3500 mg/L after inoculation, discharging sludge once every two days, controlling the sludge retention time to be 25d, controlling the hydraulic retention time to be 3-6 h, and operating at room temperature; the method comprises the steps of injecting actual domestic sewage serving as raw water into a domestic sewage water tank (1), injecting SBR (3) through a first water inlet pump (2), operating for 5-6 periods every day, wherein each period comprises water inlet for 10min, anaerobic stirring for 0.5-1.5 h, aeration for 0.5-1.5 h, sedimentation for 0.5h, water drainage for 10min, standing for 60-230 min, and the water drainage ratio is maintained at 50%. When the pollutants in the effluent mainly comprise ammonia nitrogen, the removal rate of phosphate and COD reaches over 90 percent and the SBR is considered to be successfully started after stable operation for 15d or more.
1.2) starting the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter: under the room temperature environment, sulfur particle filtering materials are added into a filter tank to keep the height of a filtering material layer at 1-1.2 m, activated sludge and anaerobic ammonium oxidation floc sludge of an anoxic tank of a sewage treatment plant are used as inoculation sludge, the inoculation sludge is mixed according to the volume ratio of 1:1, the sludge concentration after inoculation is kept at 4000-5000 mg/L, and the sulfur autotrophic denitrifying bacteria strain is injected into a sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13), ammonia nitrogen and nitrate nitrogen are distributed as mixed nutrient solution, the mixed nutrient solution is pumped into the bottom of the reactor from a water inlet by a pump, the mixed nutrient solution flows out of a water outlet and then enters a water outlet box (14) to be pumped into the reactor from the water inlet, and the mixed nutrient solution is pumped in a circulating manner, and (3) performing microbial domestication and biofilm formation on the biofilter until the nitrate nitrogen removal rate is basically stabilized at 80%, namely the biofilm formation is successful, and finishing the start of the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biofilter (13). The nutrient solution in the step (2) comprises the following components in percentage by weight: ammonium chloride (NH)4Cl, 30mg/L), potassium nitrate (KNO)340mg/L), sodium bicarbonate (NaHCO)32g/L), magnesium sulfate (MgSO)4·7H2O, 0.14g/L), calcium chloride (CaCl)2·2H2O, 0.14g/L), potassium dihydrogen phosphate (KH)2PO40.03g/L) and a trace element stock solution required by the growth of microorganisms, wherein the start-up treatment time of the biological filter is 30-50 d.
2) Operation of the System
2.1) operation of SBR:
the SBR is operated for 5-6 periods every day, anaerobic/aerobic operation is performed, each period comprises 6 processes of water feeding, anaerobic stirring, aeration stirring, sedimentation, water discharging and idling, sludge discharging is performed every two days, and the sludge retention time is controlled to be 25 d.
I, setting water inflow to be 50% of the effective volume of the reactor, controlling a water inflow switch through a time control switch, and pumping domestic sewage in a domestic sewage water tank (1) into SBR (3) through a first water inlet pump (2) after a system is started;
II, anaerobic stirring: starting anaerobic stirring after water feeding is finished, and setting the stirring time to be 0.5-1.5 h;
III, aeration stirring: and starting a first air compressor (5), aerating the SBR, providing oxygen, keeping 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 settling time to be 0.5h, and separating mud from water;
v, water drainage: setting the drainage time to be 10min and the drainage ratio to be 50 percent; directly pumping the SBR effluent mainly containing ammonia nitrogen into a sulfur autotrophic short-cut denitrification biological filter through a peristaltic pump;
VI, idling: setting the idle time to be 60-230 min;
2.2) operation of the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter: after the start of the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) is completed, pumping the secondary treatment effluent of the urban sewage treatment plant and the effluent of the SBR according to the proportion of 1:4 into the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) which is started in the step 1.2) through a water inlet, adjusting the hydraulic retention time to be 1-3 h, synchronously removing nitrate nitrogen in the secondary treatment effluent of the urban sewage treatment plant and ammonia nitrogen in domestic sewage, and discharging the effluent which reaches the standard. Part of the effluent in the water outlet tank (14) is connected with the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) through a reflux pump (15) for reflux, and the reflux ratio is 100-300%.
2.3) a back-washing process of the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter: after the biological filter tank is stably operated for a period of time, the biological membrane on the filter material thickens to a certain degree and begins to fall off to a certain degree, the activity of microorganisms and the denitrification efficiency of the effluent begin to decrease, and the operation is stopped and back washing is carried out when the denitrification efficiency of the effluent decreases by 5 percent or more. The effluent water in the water outlet tank (14) can be used as backwash water to backwash the filter material in the reaction device through a backwash pump (16), the duration of air blast is 3min first when backwash is carried out, and the air blast strength is 10-15L/(m)2S), and then carrying out air-water combined flushing for 5min, wherein the water flushing strength is 7-10L/(m)2S), finally carrying out water flushing for 3min, and discharging the wastewater after the back flushing through a third water outlet valve (19).
In conclusion, the invention provides a method and a device for deep nitrogen and phosphorus removal by coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation. The method is characterized in that urban domestic sewage and secondary treatment effluent of urban sewage treatment plants are taken as research objects, low-C/N (less than 3) domestic sewage is pumped into SBR, phosphorus accumulating bacteria firstly carry out anaerobic phosphorus release in an anaerobic section, aeration is carried out in an aerobic section, phosphorus accumulating bacteria carry out aerobic excessive phosphorus absorption, and heterotrophic bacteria remove organic matters in the domestic sewage, so that the purpose of removing the organic matters and phosphorus in the domestic sewage is achieved, and effluent pollutants mainly comprise ammonia nitrogen. Pollutants in secondary treatment effluent of a municipal sewage treatment plant mainly comprise nitrate nitrogen, the nitrate nitrogen and effluent of SBR are pumped into a sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter in proportion, the sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation denitrification processes are combined to carry out biological denitrification, and the biological denitrification and dephosphorization treatment device and method have a good total nitrogen removal effect on low-C/N (less than 3) domestic sewage, and do not need to add an additional organic carbon source.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a device for enhancing nitrogen and phosphorus removal of domestic sewage by coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation.
(1) The device comprises 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, (10) a secondary treatment water outlet tank of a town sewage treatment plant, (11) a second water inlet pump, (12) a third water inlet pump, (13) a sulfur autotrophic short-range denitrification anaerobic ammonium oxidation biological filter, (14) a water outlet tank, (15) a reflux pump, (16) a backwash pump, (17) a second air compressor, (18) a second water outlet valve, (19) a third water outlet valve, and (20) an emptying valve.
FIG. 2 is a schematic batch reactor operating mode.
The specific implementation mode is as follows:
the experimental system is shown in figure 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 ammonium oxidation biological filter (13) is 12L, and the effective volume is 7.8L.
In the test process, the secondary treatment effluent of the urban sewage treatment plant has the following specific water quality: COD concentration is 25-30 mg/L, NO3 --N concentration 15-20 mg/L, NH4 +N concentration < 1mg/L, NO2 --N concentration < 1 mg/L; the specific water quality of the domestic sewage is as follows: COD concentration is 80-200 mg/L, NH4 +The concentration of N is 45-70 mg/L, NO2 -N concentration < 1mg/L, NO3 -The concentration of-N is 15-20 mg/L.
The invention is further described in the following with reference to the accompanying drawings and examples: the device and the method for integrally strengthening the nitrogen and phosphorus removal of domestic sewage by combining sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation are characterized in that: the domestic sewage water tank (1) is connected with an SBR (sequencing batch reactor) (3) through a first water inlet pump (2), and a stirrer (4) and a dissolved oxygen monitoring device (6) are installed in the SBR (3); an aeration disc (7) in the SBR (3) is connected with a first air compressor (5); the SBR (3) is connected with the middle water tank (9) through a first water outlet valve (8); the intermediate water tank (9) and a secondary treatment water outlet tank (10) of a town sewage treatment plant are respectively connected with a sulfur autotrophic short-cut 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 ammonium oxidation biological filter (13) is connected with an exhaust valve (20) and is subjected to reverse air washing by a second air compressor (17); the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) is sequentially provided with a bearing layer (such as cobblestones) and a sulfur particle filter material from bottom to top, and the outlet water is connected with an outlet water tank (14) through a second outlet valve (18); the water outlet tank (14) is connected with the sulfur autotrophic short-cut denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux; the effluent in the water outlet tank (14) can be used as backwash water to backwash the filter material in the reaction device through a backwash pump (16), and the wastewater after backwashing is discharged through a third water outlet valve (19).
The specific implementation steps are as follows:
1) startup of system
1.1) starting of SBR: injecting the whole-course nitrified sludge of the sewage treatment plant into SBR (3) as inoculated sludge, keeping the sludge concentration at 3000-3500 mg/L after inoculation, discharging sludge once every two days, controlling the sludge retention time to be 25d, controlling the hydraulic retention time to be 3-6 h, and operating at room temperature; the method comprises the steps of taking actual domestic sewage as raw water to be injected into a domestic sewage water tank (1), injecting SBR (3) through a first water inlet pump (2), operating for 5-6 periods every day, wherein each period comprises water inlet for 10min, anaerobic stirring for 0.5-1.5 h, aeration for 0.5-1.5 h, sedimentation for 0.5h, water drainage for 10min, standing for 60-230 min, and maintaining the water drainage ratio at 50%. When the pollutants in the effluent mainly comprise ammonia nitrogen, the removal rate of phosphate and COD reaches more than 90%, and the SBR is considered to be successfully started after stable operation for 15 days or more.
1.2) starting the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter: under the room temperature environment, adding sulfur granule filter materials into a filter tank to keep the height of a filter material layer at 1-1.2 m, mixing activated sludge and anaerobic ammonia oxidation floc sludge of an anoxic tank of a sewage treatment plant as inoculation sludge according to the volume ratio of 1:1, keeping the sludge concentration at 4000-5000 mg/L after inoculation, and the sulfur autotrophic denitrifying bacteria strain is injected into a sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13), ammonia nitrogen and nitrate nitrogen are distributed as mixed nutrient solution, the mixed nutrient solution is pumped into the bottom of the reactor from a water inlet by a pump, the mixed nutrient solution flows out of a water outlet and then enters a water outlet box (14) to be pumped into the reactor from the water inlet, and the mixed nutrient solution is pumped in a circulating manner, performing microbial domestication and biofilm formation on the biological filter until the nitrate nitrogen removal rate is basically stabilized at 80%, and completing the start of the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13). The nutrient solution in the step (2) comprises the following components in percentage by weight: ammonium chloride (NH)4Cl, 30mg/L), potassium nitrate (KNO)340mg/L), sodium bicarbonate (NaHCO)32g/L), magnesium sulfate (MgSO)4·7H2O, 0.14g/L), calcium chloride (CaCl)2·2H2O, 0.14g/L), potassium dihydrogen phosphate (KH)2PO40.03g/L) and trace element stock solution required by the growth of microorganisms, wherein the starting treatment time of the biological filter is 30-50 d.
2) Operation of the System
2.1) operation of SBR:
the SBR is operated for 5-6 periods every day, anaerobic/aerobic operation is performed, each period comprises 6 processes of water feeding, anaerobic stirring, aeration stirring, sedimentation, water discharging and idling, sludge discharging is performed every two days, and the sludge retention time is controlled to be 25 d.
I, setting water inflow to be 50% of the effective volume of the reactor, controlling a water inflow switch through a time control switch, and pumping domestic sewage in a domestic sewage water tank (1) into SBR (3) through a first water inlet pump (2) after a system is started;
II, anaerobic stirring: starting anaerobic stirring after water feeding is finished, and setting the stirring time to be 0.5-1.5 h;
III, aeration stirring: and starting a first air compressor (5), aerating the SBR, providing oxygen, keeping 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 settling time to be 0.5h, and separating mud from water;
v, water drainage: setting the drainage time to be 10min and the drainage ratio to be 50 percent; directly pumping the SBR effluent mainly containing ammonia nitrogen into a sulfur autotrophic short-cut denitrification biological filter through a peristaltic pump;
VI, idling: setting the idle time to be 60-230 min;
2.2) operation of the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter: after the start of the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) is completed, pumping the secondary treatment effluent of the urban sewage treatment plant and the effluent of the SBR according to the proportion of 1:4 into the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) which is started in the step 1.2) through a water inlet, adjusting the hydraulic retention time to be 1-3 h, synchronously removing nitrate nitrogen in the secondary treatment effluent of the urban sewage treatment plant and ammonia nitrogen in domestic sewage, and discharging the effluent which reaches the standard. Part of the effluent in the effluent box (14) is connected with the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) through a reflux pump (15) for reflux, and the reflux ratio is 100-300%.
2.3) a back-washing process of the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter: after the biological filter tank is stably operated for a period of time, the biological membrane on the filter material thickens to a certain degree and begins to fall off to a certain degree, the activity of microorganisms and the denitrification efficiency of the effluent begin to decrease, and the operation is stopped and back washing is carried out when the denitrification efficiency of the effluent decreases by 5 percent or more. Outlet of the water outlet tank (14)The water can be used as backwash water to backwash the filter material in the reaction device through a backwash pump (16), the duration of air blast is 3min, and the air blast strength is 10-15L/(m)2S), and then carrying out air-water combined flushing for 5min, wherein the water flushing strength is 7-10L/(m)2S), finally carrying out water flushing for 3min, and discharging the wastewater after the back flushing through a third water outlet valve (19).
Claims (2)
1. Utilize the device of the autotrophic short distance denitrification of sulphur coupling anaerobic ammonia oxidation enhanced domestic sewage nitrogen and phosphorus removal, its characterized in that: the domestic sewage water tank (1) is connected with an SBR (sequencing batch reactor) (3) through a first water inlet pump (2), and a stirrer (4) and a dissolved oxygen monitoring device (6) are installed in the SBR (3); an aeration disc (7) in the SBR (3) is connected with a first air compressor (5); the SBR (3) is connected with the middle water tank (9) through a first water outlet valve (8); the intermediate water tank (9) and a secondary treatment water outlet tank (10) of a town sewage treatment plant are respectively connected with a sulfur autotrophic short-cut 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 ammonium oxidation biological filter (13) is connected with an exhaust valve (20) and is subjected to reverse air washing by a second air compressor (17); the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter (13) is sequentially provided with a supporting layer (such as cobblestones) and a sulfur particle filter material 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-cut denitrification anaerobic ammonia oxidation biological filter (13) through a reflux pump (15) for reflux; the effluent in the water outlet tank (14) can be used as backwash water to backwash the filter material in the reaction device through a backwash pump (16), and the wastewater after backwashing is discharged through a third water outlet valve (19).
2. Method for applying the device according to claim 1, characterized in that it comprises the following steps:
injecting whole course nitrified sludge of a sewage treatment plant into SBR as inoculated sludge, keeping the sludge concentration at 3000-3500 mg/L after inoculation, enabling actual domestic sewage with C/N less than 3 to enter the SBR as raw water through a first water inlet pump to realize a high-load activated sludge method, operating a reactor in an anaerobic/aerobic mode for 5-6 periods each day, wherein each period comprises water inlet for 10min, anaerobic stirring for 0.5-1.5 h, aeration for 0.5-1.5 h, sedimentation for 0.5h, water drainage for 10min, idling for 60-230 min, keeping dissolved oxygen in an aerobic section at 2-2.5 mg/L through a real-time control device, keeping the water drainage ratio at 50%, and removing organic matters and phosphorus in the raw water in the SBR;
the pollutants in the SBR effluent mainly comprise ammonia nitrogen, the pollutants in the secondary treatment effluent of the urban sewage treatment plant mainly comprise nitrate nitrogen, the nitrate nitrogen and the sulfur are pumped into a sulfur autotrophic short-range denitrification anaerobic ammonium oxidation biological filter through a water inlet according to the volume ratio of 1:4, sulfur autotrophic denitrification bacteria use elemental sulfur in a sulfur particle filter material as an electron donor to perform sulfur autotrophic short-range denitrification so as to provide reaction substrate nitrite nitrogen for anaerobic ammonium oxidation, the hydraulic retention time is 1-3 h, the synchronous removal of the nitrate nitrogen in the secondary treatment effluent of the urban sewage treatment plant and the ammonia nitrogen in domestic sewage is completed, and the effluent is discharged after reaching the standard; the effluent water tank is connected with the sulfur autotrophic short-cut denitrification anaerobic ammonium oxidation biological filter through a reflux pump for reflux, and the reflux ratio is 100-300%; after the biological filter tank is operated for a period of time, when the denitrification efficiency of the outlet water is reduced by 5 percent or more, the impurities retained in the filter material layer need to be removed by back washing, the outlet water in the outlet water tank can be used as back washing water to back wash the filler in the reaction device by a back washing pump, and when the back washing is carried out, the method of air-water combined washing is adopted, and the waste water after the back washing is directly discharged by a drain valve.
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