CN115124139A - Starting method of low-temperature environment sulfur autotrophic denitrification system - Google Patents
Starting method of low-temperature environment sulfur autotrophic denitrification system Download PDFInfo
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- CN115124139A CN115124139A CN202210676378.8A CN202210676378A CN115124139A CN 115124139 A CN115124139 A CN 115124139A CN 202210676378 A CN202210676378 A CN 202210676378A CN 115124139 A CN115124139 A CN 115124139A
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 203
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 185
- 239000011593 sulfur Substances 0.000 title claims abstract description 185
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 52
- 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 129
- 239000010865 sewage Substances 0.000 claims abstract description 71
- 239000010802 sludge Substances 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 106
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 104
- 229910052757 nitrogen Inorganic materials 0.000 claims description 52
- 229910002651 NO3 Inorganic materials 0.000 claims description 44
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 44
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 31
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 23
- 230000002572 peristaltic effect Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 238000004062 sedimentation Methods 0.000 claims description 12
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 10
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 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
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 235000010344 sodium nitrate Nutrition 0.000 claims description 5
- 239000004317 sodium nitrate Substances 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 3
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 3
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 244000005700 microbiome Species 0.000 description 14
- 239000003814 drug Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000010992 reflux Methods 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000011081 inoculation Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002503 metabolic effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 239000000370 acceptor Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000008177 pharmaceutical agent Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 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
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
- C02F3/2873—Particular arrangements for anaerobic reactors with internal draft tube circulation
-
- 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
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/004—Apparatus and plants for the biological treatment of water, waste water or sewage comprising a selector reactor for promoting floc-forming or other bacteria
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides a starting method of a sulfur autotrophic denitrification system in a low-temperature environment. The method comprises the following steps: step S1, inoculating activated sludge into a denitrification device; step S2, making the inoculated activated sludge internally circulate in the denitrification denitrogenation device; step S3, after the internal circulation is finished, introducing first nitrate nitrogen sewage into the denitrification device, and adding a first sulfur source to perform sulfur autotrophic denitrification domestication in the first stage; step S4, introducing second nitrate nitrogen sewage into the denitrification device, adding a second sulfur source, and performing sulfur autotrophic denitrification domestication of a second stage; and step S5, introducing third nitrate nitrogen sewage into the denitrification device, adding a third sulfur source, performing sulfur autotrophic denitrification domestication in the third stage, and then ending the starting program. The invention solves the problems of difficult starting and long time consumption of the sulfur autotrophic denitrification system in the low-temperature environment in the prior art.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a starting method of a low-temperature environment sulfur autotrophic denitrification system.
Background
Biological denitrification techniques, which generally include autotrophic nitrification and heterotrophic denitrification, are widely used in wastewater treatment and groundwater remediation, nitrogen pollution removal, and the like. However, the conventional heterotrophic denitrification process requires additional organic carbon sources and produces a large amount of excess sludge. To solve these problems, autotrophic denitrification techniques have been proposed and are receiving attention. Among them, sulfur autotrophic denitrification is considered as a biological denitrification process with cost-effectiveness and energy efficiency due to low sludge yield, and has been widely studied in the past two decades.
The use of sulfur-based autotrophic denitrification, in which sulfur-oxidizing bacteria (SOB) can use various sulfur-reducing substances such as sulfides (HS), is preferably widely explored - ) Elemental sulfur (S) 0 ) And thiosulfate (S) 2 O 3 2- ) And the like as electron donors, nitrate or nitrite as electron acceptors, and carbonate as a carbon source. Although these sulfur-based denitrification processes produce less sludge and have a low yield coefficient, the slow growth of sulfur autotrophic microorganisms also limits the increase in abundance in anoxic denitrification bioreactors to some extent, resulting in low rates of autotrophic denitrification and potential unstable operating risks, requiring more intensive exploration.
The autotrophic denitrification reaction taking the sulfide as the sulfur source generally has a slower reaction rate, the start-up time of the sulfur autotrophic denitrification system is longer, but the cost is lower and the sulfur source medicament taking the sulfide has more economical efficiency; the autotrophic denitrification reaction taking sodium thiosulfate as a sulfur source has the advantages of high reaction rate and short starting time, but the sodium thiosulfate has high price and high starting cost, and the problem of sludge leakage is easy to occur in an upflow reactor. Therefore, the selection of the sulfur source is important in view of the starting speed, the running effect and the economic cost. In addition, most of sulfur autotrophy is researched to be started at normal temperature, the starting season in practical engineering is inevitably generated in winter, for northern winter, the starting of sulfur autotrophy denitrification is greatly challenged by a low-temperature environment (8-16 ℃), the metabolic activity of sulfur autotrophy denitrification bacteria is reduced, and the enrichment of strains and the elutriation of mixed bacteria are difficult to perform. Few people research the start of the sulfur autotrophic denitrification system in the low-temperature environment and the stability of the sulfur autotrophic denitrification system in the low-temperature environment, and need to develop the research.
In summary, there is still room for further improvement in the low-temperature start-up and operation and maintenance of the sulfur autotrophic denitrification system. The invention is provided in view of the above.
Disclosure of Invention
The invention mainly aims to provide a starting method of a sulfur autotrophic denitrification system in a low-temperature environment, and aims to solve the problems that the sulfur autotrophic denitrification system in the prior art is difficult to start in the low-temperature environment and consumes a long time.
In order to achieve the above object, according to an aspect of the present invention, there is provided a start-up method of a sulfur autotrophic denitrification system in a low temperature environment, wherein the temperature of the low temperature environment is 8 to 16 ℃, the method including the following steps: step S1, inoculating activated sludge into a denitrification device; step S2, making the inoculated activated sludge internally circulate in the denitrification denitrogenation device; step S3, after the internal circulation is finished, introducing first nitrate nitrogen sewage into the denitrification device, and adding a first sulfur source to perform sulfur autotrophic denitrification domestication in the first stage; step S4, introducing second nitrate nitrogen sewage into the denitrification device, adding a second sulfur source, and performing sulfur autotrophic denitrification domestication of a second stage; step S5, introducing third nitrate nitrogen sewage into the denitrification device, adding a third sulfur source, performing sulfur autotrophic denitrification domestication in the third stage, and then ending the starting program; the concentration of nitrate nitrogen in the first nitrate nitrogen sewage, the concentration of nitrate nitrogen in the second nitrate nitrogen sewage and the concentration of nitrate nitrogen in the third nitrate nitrogen sewage are sequentially decreased, the first sulfur source, the second sulfur source and the third sulfur source are all mixtures of sodium thiosulfate and sulfur, and the ratio of sulfur in the first sulfur source, the second sulfur source and the third sulfur source is sequentially increased.
Further, in the first nitrate nitrogen sewage, the concentration of nitrate nitrogen is 80-130 mg/L; in the second nitrate nitrogen sewage, the concentration of nitrate nitrogen is 40-60 mg/L; in the third nitrate nitrogen sewage, the concentration of nitrate nitrogen is 15-25 mg/L.
Further, in the first sulfur source, the weight ratio of sodium thiosulfate to sulfur is 3.5-4.0: 1; in the second sulfur source, the weight ratio of the sodium thiosulfate to the sulfur is 2.2-2.8: 1; in the third sulfur source, the weight ratio of the sodium thiosulfate to the sulfur is 1.0-1.5: 1.
Further, in step S3, the total adding amount of the first sulfur source is 590-630 mg/L; in step S4, the total adding amount of the second sulfur source is 200-240 mg/L; in step S5, the total addition amount of the third sulfur source is 100-130 mg/L.
Furthermore, the denitrification device is of a vertical up-flow structure, the bottom of the denitrification device is provided with a water inlet, and the top of the denitrification device is provided with a water outlet; in step S3, the first nitrate nitrogen sewage is continuously introduced into the water inlet and continuously discharged from the water outlet, and the volume load of the nitrate nitrogen in the inlet water is 0.80-1.30 Kg N/(m) 3 D), when the removal rate of nitrate and nitrogen in the effluent reaches 60 percent, the acclimation in the cost stage can be finished; and/or in step S4, continuously introducing the second nitrate nitrogen sewage into the water inlet and continuously discharging the second nitrate nitrogen sewage from the water outlet, wherein the volume load of the nitrate nitrogen in the inlet water is 0.40-0.60 Kg N/(m) in 3 D), finishing the acclimation in the cost stage when the removal rate of the nitrate and the nitrogen in the effluent reaches 80 percent; and/or in step S5, continuously introducing the third nitrate nitrogen sewage into the water inlet and continuously discharging the third nitrate nitrogen sewage from the water outlet, wherein the volume load of the nitrate nitrogen in the inlet water is 0.15-0.25 Kg N/(m) of 3 D), when the removal rate of nitrate and nitrogen in the effluent reaches 85 percent, finishing all the domestication processes, and successfully starting the sulfur autotrophic denitrification system.
Further, the activated sludge is a mud-water mixture, and the preferable sludge concentration is 5-8 g/L; the denitrification device is provided with a return pipe, the bottom and the top of the denitrification device are both provided with return ports, one end of the return pipe is communicated with the return port at the bottom, the other end of the return pipe is communicated with the return port at the top, and the return pipe is provided with a peristaltic pump; in step S1, after the activated sludge is inoculated into the denitrification device, the activated sludge is kept still to separate sludge and water; in step S2, the peristaltic pump is turned on to circulate the water in the mixture of muddy water through the return pipe.
Furthermore, the internal circulation time is 1-3 days.
Further, the first nitrate nitrogen wastewater, the second nitrate nitrogen wastewater and the third nitrate nitrogen wastewater are all prepared by effluent of a secondary sedimentation tank of a sewage treatment plant and an additional medicament, and the additional medicament comprises a nitrate nitrogen medicament; preferably, the nitrate nitrogen chemical is selected from potassium nitrate and/or sodium nitrate; more preferably, the additional pharmaceutical agent optionally further comprises one or more of sodium bicarbonate and potassium dihydrogen phosphate.
Furthermore, the COD concentration in the effluent of the secondary sedimentation tank of the sewage treatment plant is 15-50 mg/L, the total nitrogen concentration is 10-20 mg/L, the ammonia nitrogen concentration is 0.1-2.5 mg/L, the total phosphorus concentration is 0.3-1.0 mg/L, and the pH value is 7.4-8.2.
By adopting the starting method of the sulfur autotrophic denitrification system, the sulfur autotrophic denitrification system can be effectively started in low-temperature environments of 8-16 ℃ such as winter, and the time consumption is relatively short. Specifically, after the activated sludge is inoculated to the denitrification device, the residual organic matters and dissolved oxygen in the activated sludge can be consumed through the internal circulation of the activated sludge, so that a good autotrophic and anoxic environment is formed, and a foundation is laid for the treatment of the subsequent stage. Secondly, the invention carries out sulfur autotrophic denitrification treatment in three stages, and the mixture of sodium thiosulfate and sulfur is used as a sulfur source. The mixed sulfur source solves the contradiction of long starting time and high starting cost of a single sulfur source on one hand, and solves the problem of sludge loss caused by high reaction rate and large gas production rate of the single sulfur source which is sodium thiosulfate.
Particularly, the concentrations of the nitrate nitrogen of the inlet water in the three stages are sequentially decreased, and the sulfur content in the sulfur source is sequentially increased. The high-concentration nitrate nitrogen in the first stage is beneficial to providing sufficient substrates for sulfur autotrophic microorganisms in the activated sludge for enrichment culture, and the high-ratio sodium thiosulfate and the low-ratio sulfur ensure the efficient utilization of the low-temperature-resistant sulfur autotrophic microorganisms to the sulfur source in the initial starting stage. Along with the proceeding of the sulfur autotrophic denitrification, the low-temperature-resistant sulfur autotrophic microorganisms are gradually domesticated and enriched, the nitrate nitrogen concentration is gradually reduced in the subsequent stage, the method is favorable for enabling the nitrate nitrogen concentration to be closer to the nitrate nitrogen concentration of the actual treated sewage, the sulfur proportion is gradually increased, the purpose of gradually improving the utilization efficiency of the sulfur is achieved, and the cost of the medicament for stably treating the sewage after starting is saved. Finally, after the starting stage, the system can stably operate in a low-temperature environment, and the sewage treatment effect is ensured.
In a word, the starting method provided by the invention is beneficial to quickly starting the sulfur autotrophic denitrification system and ensuring the stable operation of the sulfur autotrophic denitrification system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows the change in nitrate nitrogen in the feed and discharge water and the total nitrogen removal during start-up of sulfur autotrophy in a start-up process provided in accordance with example 1 of the present invention.
FIG. 2 shows the change in nitrate nitrogen in the feed and discharge water and the total nitrogen removal during start-up of sulfur autotrophic operation in the start-up process provided in accordance with example 2 of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As described in the background section of the present invention, prior art sulfur autotrophic denitrification systems are difficult and time consuming to start in low temperature environments.
In order to solve the problems, the invention provides a starting method of a sulfur autotrophic denitrification system in a low-temperature environment, wherein the temperature of the low-temperature environment is 8-16 ℃, and the starting method comprises the following steps: step S1, inoculating activated sludge into a denitrification device; step S2, making the inoculated activated sludge internally circulate in the denitrification denitrogenation device; step S3, after the internal circulation is finished, introducing first nitrate nitrogen sewage into the denitrification device, and adding a first sulfur source to perform sulfur autotrophic denitrification domestication in the first stage; step S4, introducing second nitrate nitrogen sewage into the denitrification device, adding a second sulfur source, and performing sulfur autotrophic denitrification domestication of a second stage; step S5, introducing third nitrate nitrogen sewage into the denitrification device, adding a third sulfur source, performing sulfur autotrophic denitrification domestication in the third stage, and then ending the starting program; the concentration of nitrate nitrogen in the first nitrate nitrogen sewage, the concentration of nitrate nitrogen in the second nitrate nitrogen sewage and the concentration of nitrate nitrogen in the third nitrate nitrogen sewage are sequentially decreased, the first sulfur source, the second sulfur source and the third sulfur source are all a mixture of sodium thiosulfate and sulfur, and the proportion of sulfur in the first sulfur source, the second sulfur source and the third sulfur source is sequentially increased.
By adopting the starting method of the sulfur autotrophic denitrification system, the sulfur autotrophic denitrification system can be effectively started in low-temperature environments of 8-16 ℃ such as winter, and the time consumption is relatively short. Specifically, after the activated sludge is inoculated to the denitrification device, the residual organic matters and dissolved oxygen in the activated sludge can be consumed through the internal circulation of the activated sludge, so that a good autotrophic and anoxic environment is formed, and a foundation is laid for the treatment of the subsequent stage. Secondly, the invention carries out sulfur autotrophic denitrification treatment in three stages, and the mixture of sodium thiosulfate and sulfur is used as a sulfur source. The mixed sulfur source solves the contradiction of long starting time and high starting cost of a single sulfur source on one hand, and solves the problem of sludge loss caused by high reaction rate and large gas production rate of the single sulfur source which is sodium thiosulfate.
Particularly, the concentrations of the nitrate nitrogen of the inlet water in the three stages are sequentially decreased, and the sulfur ratio in the sulfur source is sequentially increased. The high-concentration nitrate nitrogen in the first stage is beneficial to providing sufficient substrates for sulfur autotrophic microorganisms in the activated sludge for enrichment culture, and the high-ratio sodium thiosulfate and the low-ratio sulfur ensure the efficient utilization of the low-temperature-resistant sulfur autotrophic microorganisms to the sulfur source in the initial starting stage. Along with the proceeding of the sulfur autotrophic denitrification, the low-temperature-resistant sulfur autotrophic microorganisms are gradually domesticated and enriched, the nitrate nitrogen concentration is gradually reduced in the subsequent stage, the method is favorable for enabling the nitrate nitrogen concentration to be closer to the nitrate nitrogen concentration of the actual treated sewage, the sulfur proportion is gradually increased, the purpose of gradually improving the utilization efficiency of the sulfur is achieved, and the operation cost for stably treating the sewage after starting is saved. Finally, after the starting stage, the system can stably operate in a low-temperature environment, and the sewage treatment effect is ensured.
In a word, the starting method provided by the invention is beneficial to quickly starting the sulfur autotrophic denitrification system and ensuring the stable operation of the sulfur autotrophic denitrification system, and is particularly suitable for the deep denitrification treatment of secondary effluent of the municipal sewage treatment plant.
In a preferred embodiment, the concentration of the nitrate nitrogen in the first nitrate nitrogen wastewater is 80-130 mg/L; in the second nitrate nitrogen sewage, the concentration of nitrate nitrogen is 40-60 mg/L; in the third nitrate nitrogen sewage, the concentration of nitrate nitrogen is 15-25 mg/L. The concentration of the first nitrate nitrogen wastewater is controlled in the range, which is beneficial to more fully promoting the enrichment culture of the sulfur autotrophic microorganisms. The nitrate nitrogen sewage concentration of the latter two stages is controlled in the range, so that the nitrate nitrogen concentration can be close to the concentration in actual sewage step by step, and the acclimation of sulfur autotrophic microorganisms can be better completed in the concentration conversion process, thereby further improving the starting effect of the sulfur autotrophic denitrification system, improving the starting speed and ensuring the treatment effect in the subsequent normal sewage treatment process.
In order to enable the sulfur autotrophic denitrification system to be started more quickly and simultaneously gradually increase the proportion of sulfur in the mixed sulfur source so as to better ensure the effect of subsequent sewage treatment and low cost, in a preferred embodiment, the weight ratio of sodium thiosulfate to sulfur in the first sulfur source is 3.5-4.0: 1; in the second sulfur source, the weight ratio of the sodium thiosulfate to the sulfur is 2.2-2.8: 1; in the third sulfur source, the weight ratio of the sodium thiosulfate to the sulfur is 1.0-1.5: 1. The mixed sulfur source with the proportion in different stages is more beneficial to exerting advantages in different stages, better improving the reaction efficiency of low-temperature environment operation in winter, and better preventing the problem of sludge loss caused by overlarge gas production.
In a preferred embodiment, in step S3, the first sulfur source is added in an amount of 590-630 mg/L; in step S4, the adding amount of the second sulfur source is 200-240 mg/L; in step S5, the third sulfur source is added in an amount of 100-130 mg/L. The adding amount of the mixed sulfur source in each stage is controlled within the range, so that the advantages of the mixed sulfur sources in different proportions can be better exerted, the reaction efficiency of low-temperature operation in winter can be ensured, and the problem of sludge loss can be better reduced. The acclimation is started under the condition of high-concentration nitrate nitrogen in the first stage so as to achieve the purpose of quickly enriching the sulfur autotrophic microorganisms. In the domestication process, the concentration of the nitrate nitrogen in the inlet water is gradually reduced to be closer to the concentration of the nitrate nitrogen in the secondary outlet water of the actual sewage treatment plant, the advanced treatment of the secondary outlet water is realized, meanwhile, the proportion of the sodium thiosulfate and the sulfur powder is continuously adjusted, the specific gravity of the sulfur powder is increased, and the operation cost is greatly saved.
The above sulfur autotrophic denitrification system may be one known in the art, and more preferably, a denitrification device disclosed in chinese patent application CN106630134A is used. Preferably, the denitrification device is of a vertical upflow structure, the bottom of the denitrification device is provided with a water inlet, and the top of the denitrification device is provided with a water outlet. By using the upflow reactor, denitrification can be performed more stably by adjusting the upward flow rate of the system by the amount of reflux.
In the actual operation process, in the step S3, the first nitrate nitrogen wastewater is continuously introduced into the water inlet and continuously discharged from the water outlet, and the volumetric load of the influent nitrate nitrogen is 0.8 to 1.3Kg N/(m) 3 D), when the removal rate of nitrate and nitrogen in the effluent reaches 60 percent, the acclimation in the cost stage can be finished; and/or in step S4, continuously introducing the second nitrate nitrogen sewage into the water inlet and continuously discharging the second nitrate nitrogen sewage from the water outlet, wherein the volume load of the nitrate nitrogen in the inlet water is 0.40-0.60 Kg N/(m) in 3 D), when the removal rate of nitrate and nitrogen in the effluent reaches 80 percent, the acclimation in the cost stage can be finished; and/or in step S5, continuously introducing the third nitrate nitrogen sewage into the water inlet and continuously discharging the third nitrate nitrogen sewage from the water outlet, wherein the volume load of the nitrate nitrogen in the inlet water is 0.15-0.25 Kg N/(m) of 3 D), when the removal rate of nitrate and nitrogen in the effluent reaches 85%, the acclimation in the cost stage can be finished, and the start of the sulfur autotrophic denitrification system is successful. The volume loading refers to the nitrate nitrogen loading per unit volume of the reactor. The load of the nitrate nitrogen of the activated sludge at each stage in the starting process is controlled within the range, so that the denitrification processing capacity of the sulfur autotrophic microorganisms at different stages can be better matched, and the sulfur autotrophic microorganisms can stably and gradually reach the optimal denitrification state, thereby achieving the aim of removing nitrogen in the activated sludgeThe startup effect is further improved. In the actual operation process, the activated sludge in the reactor can reach a good mixing state by adjusting the rising flow rate of the inlet water (such as adjusting the size of the reflux) in each stage, and the short-flow phenomenon is avoided. For example, the flow rate can be controlled to be 1-3 m/h at the initial stage of starting, and the flow rate can be gradually increased to be more than 3m/h after the operation is stable.
The activated sludge may be of a type commonly used in the art, for example, excess sludge from a secondary sedimentation tank of a municipal sewage treatment plant, which contains a certain amount of sulfur autotrophic microorganisms, but the abundance and activity of the sulfur autotrophic microorganisms are not high. In a preferred embodiment, the activated sludge is a mud-water mixture, and the concentration of the sludge is preferably 5-8 g/L; the denitrification device is provided with a return pipe, the bottom and the top of the denitrification device are both provided with return ports, one end of the return pipe is communicated with the return port at the bottom, the other end of the return pipe is communicated with the return port at the top, and the return pipe is provided with a peristaltic pump; in step S1, the activated sludge is inoculated into a denitrification device and then left to stand to separate sludge and water from the activated sludge; in step S2, the peristaltic pump is turned on to circulate the water in the mixture of muddy water through the return pipe. By using the upflow denitrification device, the internal circulation from the return pipe to the denitrification device body can be realized by controlling the flow of the peristaltic pump, and the sludge in the process is also stirred slightly in the water circulation process, so that the sludge can consume residual organic matters and dissolved oxygen, and a good autotrophic and anoxic environment is formed. In the actual operation process, the rising flow velocity of water in the internal circulation process can be kept to be 1-3 m/h. Preferably, the internal circulation time is 1 to 3 days.
In a preferred embodiment, the first nitrate nitrogen wastewater, the second nitrate nitrogen wastewater and the third nitrate nitrogen wastewater are all prepared from effluent of a secondary sedimentation tank of a sewage treatment plant and an external medicament, and the external medicament comprises a nitrate nitrogen medicament; preferably, the nitrate nitrogen agent is selected from potassium nitrate and/or sodium nitrate. When the water is artificially distributed, the externally added medicament preferably also comprises one or more of trace elements, sodium bicarbonate and potassium dihydrogen phosphate.
The starting method is suitable for a sulfur autotrophic denitrification system in a low-temperature environment, and is used for preparing effluent of a secondary sedimentation tank of a sewage treatment plant feeding water in three stages, wherein the COD concentration is 15-50 mg/L, the total nitrogen concentration is 10-20 mg/L, the ammonia nitrogen concentration is 0.1-2.5 mg/L, the total phosphorus concentration is 0.3-1.0 mg/L, and the pH value is 7.4-8.2. After the system is started, the sulfur autotrophic denitrification system can stably treat the effluent of the secondary sedimentation tank of the sewage treatment plant, and complete the deep denitrification of the effluent in a low-temperature environment.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
Example 1
The embodiment adopts the denitrification device disclosed in the Chinese patent application CN106630134A, which is an upflow reactor provided with a reflux port, the material is organic glass, the effective volume is 12L, the bottom of the reactor is provided with a reflux inlet, a water inlet, a sludge discharge port and a water distribution pore plate, and water inlet and reflux are carried out through a peristaltic pump.
The activated sludge inoculated in the reactor comes from the excess sludge of a secondary sedimentation tank of a municipal sewage treatment plant in Beijing, and the sludge concentration in the reactor after inoculation reaches 6 g/L. And then, starting internal circulation through a peristaltic pump to ensure that the rising flow rate reaches 2.5m/h, and only circularly running for 2 days without water inflow to ensure that the activated sludge consumes residual organic matters and dissolved oxygen to form a good autotrophic and anoxic environment.
During the test, the secondary effluent of an actual sewage treatment plant is adopted, and sodium nitrate, sulfur powder and sodium thiosulfate are supplemented according to the concentration requirement. The actual secondary effluent of the sewage treatment plant has the following water quality characteristics: the COD concentration is 15-50 mg/L, the TN concentration is 10-20 mg/L, the ammonia nitrogen concentration is 0.1-2.5 mg/L, the TP concentration is 0.3-1.0 mg/L, and the pH value is about 7.4-8.2.
The first stage is a high-load starting stage, the total period is 12 days, the average concentration of the nitrate and nitrogen in the inlet water is 98mg/L, the concentration of the added sulfur powder is 130mg/L, the concentration of the sodium thiosulfate is 480mg/L, the ascending flow rate is 2m/h, the average concentration of the nitrate and nitrogen in the outlet water is 50.4mg/L, and the nitrate and nitrogen removal load is 0.47kg N/(m/h) 3 D), nitrate Nitrogen Removal (NRE) of 61.8% at this stage is high concentrationThe water inlet condition and the average water temperature of 8.1 ℃ can achieve 61.8 percent of nitrate and nitrogen removal rate, which shows that the sulfur autotrophic denitrifying bacteria in the system gradually adapt to the low-temperature environment, and have certain metabolic activity, and the start of the sulfur autotrophic denitrifying system is basically successful but needs to be strengthened. The second stage is a medium-load operation stage, the total 22 days are totally, the average concentration of the nitrate and nitrogen in the inlet water is 44mg/L, the concentration of the added sulfur powder is 65mg/L, the concentration of the sodium thiosulfate is 150mg/L, the average concentration of the nitrate and nitrogen in the outlet water in the whole second stage is 16.6mg/L, and the nitrate and nitrogen removal load is 0.27kg N/(m) N 3 D), nitrate Nitrogen Removal (NRE) reaches 83.9%. The third stage is a low-load operation stage, the total time is 15 days, the average concentration of the nitrate and nitrogen in the inlet water is 25mg/L, the concentration of the added sulfur powder is 50mg/L, the concentration of the sodium thiosulfate is 75mg/L, the average concentration of the nitrate and nitrogen in the outlet water is 3.0mg/L, and the removal load of the nitrate and nitrogen is 0.22kg N/(m) N/(m) N 3 D), the nitrate and nitrogen removal rate (NRE) is 88.3%, the concentration of the nitrate and nitrogen in the inlet water at the stage is relatively close to the concentration of the nitrate and nitrogen in the outlet water after the nitrification of the actual domestic sewage is finished, and the concentration of the nitrate and nitrogen in the outlet water is stably maintained below 5 mg/L. The whole starting process under the low-temperature environment of 8-16 ℃ in winter is completed in 49 days, and the change conditions of nitrate nitrogen in inlet water and outlet water and the total nitrogen removal rate during the sulfur autotrophic starting period are shown in figure 1, wherein Inf 3- N represents the nitrate nitrogen concentration of the feed water, Eff 3- N represents the concentration of nitrate nitrogen in effluent.
Example 2
The embodiment adopts the denitrification device disclosed in the Chinese patent application CN106630134A, which is an upflow reactor provided with a reflux port, the material is organic glass, the effective volume is 12L, the bottom of the reactor is provided with a reflux inlet, a water inlet, a sludge discharge port and a water distribution pore plate, and water inlet and reflux are carried out through a peristaltic pump. Compared with example 1, this example has some variations in sludge concentration, nitrate nitrogen concentration at each stage, and the amount of sulfur source added.
The activated sludge inoculated in the reactor comes from the excess sludge of a secondary sedimentation tank of a municipal sewage treatment plant in Beijing, and the sludge concentration in the reactor after inoculation reaches 8 g/L. And then, starting internal circulation through a peristaltic pump to ensure that the rising flow rate reaches 3m/h, and only circularly running for 3 days without water inflow to ensure that the activated sludge consumes residual organic matters and dissolved oxygen to form a good autotrophic and anoxic environment.
During the test, the secondary effluent of an actual sewage treatment plant is adopted, and sodium nitrate, sulfur powder and sodium thiosulfate are supplemented according to the concentration requirement. The water quality characteristics of the secondary effluent of the actual sewage treatment plant are as follows: the COD concentration is 15-50 mg/L, the TN concentration is 10-20 mg/L, the ammonia nitrogen concentration is 0.1-2.5 mg/L, the TP concentration is 0.3-1.0 mg/L, and the pH value is about 7.4-8.2.
The first stage is a high-load starting stage, the total period is 14 days, the average concentration of nitrate nitrogen in inlet water is 130mg/L, the concentration of added sulfur powder is 130mg/L, the concentration of sodium thiosulfate is 500mg/L, the average concentration of nitrate nitrogen in outlet water is 65.6mg/L, and the removal load of nitrate nitrogen is 0.64kg N/(m) N 3 D), nitrate Nitrogen Removal (NRE) reaches 65.9%. The second stage is a medium-load operation stage, the total period is 18 days, the average concentration of the nitrate and the nitrogen in the inlet water is 59mg/L, the concentration of the added sulfur powder is 65mg/L, the concentration of the sodium thiosulfate is 180mg/L, the average concentration of the nitrate and the nitrogen in the outlet water in the whole second stage is 19.3mg/L, and the nitrate and nitrogen removal load is 0.40kg N/(m) N 3 D), nitrate Nitrogen Removal (NRE) reaches 82.1%. The third stage is a low-load operation stage, the total period is 11 days, the average concentration of nitrate nitrogen in inlet water is 16mg/L, the concentration of added sulfur powder is 50mg/L, the concentration of sodium thiosulfate is 50mg/L, the average concentration of nitrate nitrogen in outlet water is 2.6mg/L, and the nitrate nitrogen removal load is 0.14kg N/(m) N 3 D), the nitrate and nitrogen removal rate (NRE) reaches 90.0%, the concentration of the nitrate and nitrogen in the inlet water at the stage is relatively close to the concentration of the nitrate and nitrogen in the outlet water after the nitrification of the actual domestic sewage is finished, and the concentration of the nitrate and nitrogen in the outlet water is stably maintained below 3 mg/L. The whole starting process under the low-temperature environment of 8-16 ℃ in winter is finished in 45 days, the change conditions of nitrate nitrogen in inlet and outlet water and the total nitrogen removal rate during the sulfur autotrophic starting period are shown in figure 2, wherein Inf 3- N represents the nitrate nitrogen concentration of the feed water, Eff 3- N represents the concentration of nitrate nitrogen in effluent.
Comparative example 1
The test apparatus, water quality source, sludge source and ambient temperature of this comparative example were the same as those of the two examples except that the test was carried out using only sulfur powder as the only sulfur source.
The activated sludge inoculated in the reactor comes from the excess sludge of a secondary sedimentation tank of a municipal sewage treatment plant in Beijing, and the sludge concentration in the reactor after inoculation reaches 8 g/L. And then, starting internal circulation through a peristaltic pump to ensure that the rising flow rate reaches 3m/h, and only circularly running for 3 days without water inflow to ensure that the activated sludge consumes residual organic matters and dissolved oxygen to form a good autotrophic and anoxic environment.
The first stage is a high-load starting stage, the total time is 28 days, the average concentration of the nitrate and the nitrogen in the inlet water is 105mg/L, the concentration of the added sulfur powder is 300mg/L, the average concentration of the nitrate and the nitrogen in the outlet water is 68.3mg/L, and the removal load of the nitrate and the nitrogen reaches 0.64kg N/(m N/(m N) and m N 3 D), nitrate Nitrogen Removal (NRE) reaches 60.6%. The second stage is a medium-load operation stage, the total time is 30 days, the average concentration of the nitrate and the nitrogen in the inlet water is 52mg/L, the concentration of the added sulfur powder is 150mg/L, the average concentration of the nitrate and the nitrogen in the outlet water in the whole second stage is 17.5mg/L, and the removal load of the nitrate and the nitrogen reaches 0.43kg N/(m/L) 3 D), nitrate Nitrogen Removal (NRE) reaches 83.2%. The third stage is a low-load operation stage, the total time is 25 days, the average concentration of the nitrate and the nitrogen in the inlet water is 20mg/L, the concentration of the added sulfur powder is 70mg/L, the average concentration of the nitrate and the nitrogen in the outlet water is 2.9mg/L, and the removal load of the nitrate and the nitrogen reaches 0.18kg N/(m N/(m N) and m N 3 D), the nitrate and nitrogen removal rate (NRE) reaches 89.5%, the concentration of the nitrate and nitrogen in the inlet water at the stage is relatively close to the concentration of the nitrate and nitrogen in the outlet water after the nitrification of the actual domestic sewage is finished, and the concentration of the nitrate and nitrogen in the outlet water is stably maintained below 5 mg/L. The whole starting process under the low-temperature environment of 8-16 ℃ in winter is completed in 83 days, and the comparative example 1 shows that the sulfur autotrophic denitrification process using single sulfur powder as a sulfur source needs longer acclimation time.
Comparative example 2
The test device, water quality source, sludge source and environment temperature of the comparative example are the same as those of the two examples, except that the comparative example always adopts low nitrate nitrogen inflow load to acclimate the sludge, and the sulfur source is still a mixture of sulfur powder and sodium thiosulfate.
The activated sludge inoculated in the reactor comes from the excess sludge of a secondary sedimentation tank of a municipal sewage treatment plant in Beijing, and the sludge concentration in the reactor after inoculation reaches 8 g/L. And then, starting internal circulation through a peristaltic pump to ensure that the rising flow rate reaches 3m/h, and only circularly running for 3 days without water inflow to ensure that the activated sludge consumes residual organic matters and dissolved oxygen to form a good autotrophic and anoxic environment.
The average concentration of the nitrate nitrogen in the inlet water is 25mg/L, the concentration of the added sulfur powder is 50mg/L, and the concentration of the sodium thiosulfate is 50mg/L, and the acclimation of the sludge is carried out under the conditions. The nitrate nitrogen concentration of the effluent at 5 days is 20mg/L, and the removal rate is 20%; the nitrate nitrogen concentration of the effluent at 20 days is 17mg/L, and the removal rate is 32 percent; the nitrate nitrogen concentration of the effluent at 38 days is 10mg/L, and the removal rate reaches 60 percent; the nitrate nitrogen concentration of the effluent at 58 days is 6mg/L, and the removal rate reaches 76%; the nitrate nitrogen concentration of the effluent on the 75 th day is 2.6mg/L, and the removal rate reaches 90 percent. Under the environment of low temperature of 8-16 ℃, 75 days are needed for starting the sulfur autotrophic denitrification process by adopting a domestication mode with low nitrate nitrogen load, and longer domestication time is needed compared with the domestication mode for gradually reducing the nitrate nitrogen concentration of the inlet water.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the invention realizes the quick starting process of the sulfur autotrophic denitrification system in the low-temperature environment in winter;
the invention adopts the mixed sulfur source with the optimal proportion, thereby not only ensuring the quick start effect of the sulfur autotrophic denitrification system, but also realizing the purpose of saving the operation cost of the medicament.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A starting method of a sulfur autotrophic denitrification system in a low-temperature environment is characterized by comprising the following steps of:
step S1, inoculating the activated sludge into a denitrification device;
a step S2 of internally circulating the inoculated activated sludge in the denitrification device;
step S3, after the internal circulation is finished, introducing first nitrate nitrogen sewage into the denitrification device, and adding a first sulfur source to perform sulfur autotrophic denitrification domestication in a first stage;
step S4, introducing second nitrate nitrogen sewage into the denitrification device, adding a second sulfur source, and performing sulfur autotrophic denitrification domestication of a second stage;
step S5, introducing third nitrate nitrogen sewage into the denitrification device, adding a third sulfur source, performing sulfur autotrophic denitrification acclimation in a third stage, and ending the starting program;
the concentration of nitrate nitrogen in the first nitrate nitrogen sewage, the second nitrate nitrogen sewage and the third nitrate nitrogen sewage is decreased sequentially, the first sulfur source, the second sulfur source and the third sulfur source are all a mixture of sodium thiosulfate and sulfur, and the proportion of sulfur in the first sulfur source, the second sulfur source and the third sulfur source is increased sequentially.
2. The starting method of the low-temperature environment sulfur autotrophic denitrification system according to claim 1, wherein the concentration of nitrate nitrogen in the first nitrate nitrogen wastewater is 80-130 mg/L; in the second nitrate nitrogen sewage, the concentration of nitrate nitrogen is 40-60 mg/L; and in the third nitrate nitrogen sewage, the concentration of nitrate nitrogen is 15-25 mg/L.
3. The starting method of the low-temperature environment sulfur autotrophic denitrification system according to claim 1 or 2, wherein the weight ratio of the sodium thiosulfate to the sulfur in the first sulfur source is 3.5-4.0: 1; in the second sulfur source, the weight ratio of sodium thiosulfate to sulfur is 2.2-2.8: 1; in the third sulfur source, the weight ratio of the sodium thiosulfate to the sulfur is 1.0-1.5: 1.
4. The starting method of the low-temperature environment sulfur autotrophic denitrification system according to any one of claims 1 to 3, wherein in the step S3, the total dosage of the first sulfur source is 590-630 mg/L; in the step S4, the total adding amount of the second sulfur source is 200-240 mg/L; in the step S5, the total adding amount of the third sulfur source is 100-130 mg/L.
5. The starting method of the low-temperature environment sulfur autotrophic denitrification system according to any one of claims 1 to 4, wherein the denitrification device is of a vertical upflow structure, and has a water inlet at the bottom and a water outlet at the top;
in the step S3, the first nitrate nitrogen sewage is continuously introduced into the water inlet and continuously discharged from the water outlet, and the volume load of the nitrate nitrogen in the inlet water is 0.80-1.30 Kg N/(m) 3 D), when the removal rate of nitrate and nitrogen in the effluent reaches 60 percent, the acclimation in the cost stage can be finished; and/or
In the step S4, the second nitrate nitrogen sewage is continuously introduced into the water inlet and continuously discharged from the water outlet, and the volume load of the nitrate nitrogen in the inlet water is 0.40-0.60 Kg N/(m) of 3 D), finishing the acclimation in the cost stage when the removal rate of the nitrate and the nitrogen in the effluent reaches 80 percent; and/or
In the step S5, the third nitrate nitrogen sewage is continuously introduced into the water inlet and continuously discharged from the water outlet, and the volume load of the nitrate nitrogen in the inlet water is 0.15-0.25 Kg N/(m) 3 D), when the removal rate of nitrate and nitrogen in the effluent reaches 85 percent, finishing all the domestication processes, and successfully starting the sulfur autotrophic denitrification system.
6. The starting method of the low-temperature environment sulfur autotrophic denitrification system according to claim 5, wherein the activated sludge is a mixture of sludge and water, preferably the sludge concentration is 5-8 g/L; the denitrification device is provided with a return pipe, the bottom and the top of the denitrification device are both provided with return ports, one end of the return pipe is communicated with the return port at the bottom, the other end of the return pipe is communicated with the return port at the top, and the return pipe is provided with a peristaltic pump;
in the step S1, the activated sludge is inoculated into a denitrification device and then left to stand, so that the activated sludge is subjected to sludge-water separation; in step S2, the peristaltic pump is turned on to circulate the water in the mud-water mixture through the return pipe.
7. The method for starting up a low-temperature environment sulfur autotrophic denitrification system according to claim 6, wherein the time of the internal circulation is 1-3 days.
8. The startup method of the low temperature environment sulfur autotrophic denitrification system according to any one of claims 1 to 7, wherein the first, second and third nitrate nitrogen effluents are each formulated from a wastewater treatment plant secondary sedimentation tank effluent and an additional agent, the additional agent comprising a nitrate nitrogen agent.
9. The method for starting a low-temperature environment sulfur autotrophic denitrification system according to claim 8, wherein the nitrate nitrogen chemical is selected from potassium nitrate and/or sodium nitrate; preferably, the additional agent optionally further comprises one or more of sodium bicarbonate and potassium dihydrogen phosphate.
10. The starting method of the low-temperature environment sulfur autotrophic denitrification system according to claim 8, wherein the COD concentration in the effluent of the secondary sedimentation tank of the sewage treatment plant is 15-50 mg/L, the total nitrogen concentration is 10-20 mg/L, the ammonia nitrogen concentration is 0.1-2.5 mg/L, the total phosphorus concentration is 0.3-1.0 mg/L, and the pH value is 7.4-8.2.
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