CN115124139B - Starting method of sulfur autotrophic denitrification system in low-temperature environment - Google Patents
Starting method of sulfur autotrophic denitrification system in low-temperature environment Download PDFInfo
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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 95
- 238000000034 method Methods 0.000 title claims abstract description 58
- 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 166
- 239000010865 sewage Substances 0.000 claims abstract description 76
- 239000010802 sludge Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 101
- 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
- 238000010992 reflux Methods 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 230000002572 peristaltic effect Effects 0.000 claims description 13
- 238000004062 sedimentation Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000002351 wastewater Substances 0.000 claims description 8
- 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 group [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
- 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
- 238000000926 separation method Methods 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 244000005700 microbiome Species 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 230000000630 rising effect Effects 0.000 description 9
- 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
- 241000894006 Bacteria Species 0.000 description 5
- 239000003814 drug Substances 0.000 description 5
- 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
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002503 metabolic effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 230000014233 sulfur utilization Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 239000000370 acceptor Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003756 stirring Methods 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—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
-
- 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
-
- 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
-
- 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
Abstract
The invention provides a method for starting 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; s2, internal circulation is carried out on the inoculated activated sludge in a denitrification device; 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; s4, introducing second nitrate nitrogen sewage into the denitrification device, adding a second sulfur source, and performing sulfur autotrophic denitrification domestication in a second stage; and S5, introducing third nitrate nitrogen sewage into the denitrification device, adding a third sulfur source, performing sulfur autotrophic denitrification domestication in a third stage, and ending the starting procedure. The method solves the problems of difficult starting and long time consumption of the sulfur autotrophic denitrification system in the prior art under a low-temperature environment.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for starting a sulfur autotrophic denitrification system in a low-temperature environment.
Background
Biological denitrification techniques generally include autotrophic nitrification and heterotrophic denitrification, which are widely used in wastewater treatment and groundwater remediation, nitrogen pollution removal, and the like. However, the conventional heterotrophic denitrification process requires an additional organic carbon source and generates a large amount of surplus sludge. To solve these problems, autotrophic denitrification techniques have been proposed and have been attracting attention. Among them, sulfur autotrophic denitrification is considered as a cost-effective and energy-efficient biological denitrification process due to low sludge yield, and has been widely studied in the past two decades.
The use of sulfur-based autotrophic denitrification is widely explored, where Sulfur Oxidizing Bacteria (SOB) can use various sulfur-reducing species such as sulfides (HS) - ) 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 low yield coefficients, the slow growth of sulfur autotrophic microorganisms also limits to some extent the increase in abundance in the anoxic denitrification bioreactor, resulting in low autotrophic denitrification rates and potential unstable operation risks, requiring more extensive exploration.
The autotrophic denitrification reaction taking sulfide as a sulfur source is generally slower in reaction rate, and the startup time of a sulfur autotrophic denitrification system is longer, but the cost of taking sulfide as a sulfur source medicament is lower, so that the method is more economical; the autotrophic denitrification reaction taking sodium thiosulfate as a sulfur source has the advantages of relatively high reaction rate and short starting time, but the sodium thiosulfate has relatively high price and relatively high starting cost, and the problem of mud leakage easily occurs to the upflow reactor. Therefore, the choice of sulfur source is important in terms of the speed of start-up, the operating efficiency and the economic cost. In addition, most sulfur autotrophy is researched at normal temperature, the starting season in practical engineering is inevitably in winter, the starting of sulfur autotrophy denitrification is challenged in low-temperature environment (8-16 ℃) in northern winter, the metabolic activity of sulfur autotrophy denitrification bacteria is reduced, and enrichment of bacteria and elutriation of mixed bacteria are difficult to carry out. Few people start the sulfur autotrophic denitrification system under the low-temperature environment, and the stability of the sulfur autotrophic denitrification system under the low-temperature environment is explored, so that the exploration is necessary.
In summary, there is still room for further improvement in the low temperature start-up and operation of sulfur autotrophic denitrification systems. In view of this, the present invention has been proposed.
Disclosure of Invention
The invention mainly aims to provide a method for starting a sulfur autotrophic denitrification system in a low-temperature environment, so as to solve the problems that the sulfur autotrophic denitrification system in the prior art is difficult to start in the low-temperature environment and takes a long time.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for starting up a sulfur autotrophic denitrification system in a low temperature environment at a temperature of 8 to 16 ℃, comprising the steps of: step S1, inoculating activated sludge into a denitrification device; s2, internal circulation is carried out on the inoculated activated sludge in a denitrification device; 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; s4, introducing second nitrate nitrogen sewage into the denitrification device, adding a second sulfur source, and performing sulfur autotrophic denitrification domestication in a second stage; s5, introducing third nitrate nitrogen sewage into the denitrification device, adding a third sulfur source, performing sulfur autotrophic denitrification domestication in a third stage, and ending a starting procedure; the concentration of nitrate nitrogen in the first nitrate nitrogen sewage, the second nitrate nitrogen sewage and the third nitrate nitrogen sewage is 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 the 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 the 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 the nitrate nitrogen is 15-25 mg/L.
Further, in the first sulfur source, the weight ratio of the sodium thiosulfate to the 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 the step S3, the total adding amount of the first sulfur source is 590-630 mg/L; in the step S4, the total addition amount of the second sulfur source is 200-240 mg/L; in the step S5, the total addition amount of the third sulfur source is 100-130 mg/L.
Further, 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 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 inlet nitrate nitrogen is 0.80-1.30 Kg N/(m) 3 D), when the removal rate of nitrate nitrogen in the effluent reaches 60%, the domestication at the stage can be completed; and/or in the step S4, continuously introducing the second nitrate nitrogen sewage into the water inlet, continuously discharging the second nitrate nitrogen sewage from the water outlet, wherein the volume load of the inlet nitrate nitrogen is 0.40-0.60 Kg N/(m) 3 D), when the removal rate of nitrate nitrogen in the effluent reaches 80%, the domestication at the stage can be completed; and/or in the step S5, continuously introducing the third nitrate nitrogen sewage into the water inlet, continuously discharging the sewage from the water outlet, wherein the volume load of the nitrate nitrogen in the inlet is 0.15-0.25 Kg N/(m) 3 D), when the removal rate of the nitrate nitrogen in the effluent reaches 85%, finishing all domestication processes, and starting the sulfur autotrophic denitrification system successfully.
Further, the activated sludge is a sludge-water mixture, and the sludge concentration is preferably 5-8 g/L; the denitrification device is provided with a reflux pipe, the bottom and the top of the denitrification device are both provided with reflux ports, one end of the reflux pipe is communicated with the reflux port at the bottom, the other end of the reflux pipe is communicated with the reflux port at the top, and the reflux pipe is provided with a peristaltic pump; in the step S1, after inoculating the activated sludge into a denitrification device, standing to enable the activated sludge to form mud-water separation; in step S2, a peristaltic pump is started, so that water in the mud-water mixture circulates internally through a return pipe.
Further, the internal circulation time is 1 to 3 days.
Further, the first nitrate nitrogen sewage, the second nitrate nitrogen sewage and the third nitrate nitrogen sewage are prepared from effluent of a secondary sedimentation tank of a sewage treatment plant and an external medicament, wherein the external medicament comprises a nitrate nitrogen medicament; preferably, the nitrate nitrogen agent is selected from potassium nitrate and/or sodium nitrate; more preferably, the external agent optionally further comprises one or more of sodium bicarbonate and potassium dihydrogen phosphate.
Further, 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.
The starting method of the sulfur autotrophic denitrification system provided by the invention can effectively start the sulfur autotrophic denitrification system in a low-temperature environment of 8-16 ℃ such as winter, and the time consumption is relatively short. Specifically, after the activated sludge is inoculated to the denitrification device, 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 three-stage sulfur autotrophic denitrification treatment, and takes the mixture of sodium thiosulfate and sulfur 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 faster reaction rate and large gas production by taking sodium thiosulfate as the single sulfur source on the other hand.
It is specially required to explain that the concentration of the nitrate nitrogen in the water in the three stages is gradually decreased, and the sulfur ratio in the sulfur source is gradually increased. The high concentration of nitrate nitrogen in the first stage is beneficial to providing sufficient substrate for sulfur autotrophic microorganisms in the activated sludge for enrichment culture, and the high-duty ratio sodium thiosulfate and the low-duty ratio sulfur ensure the high-efficiency utilization of sulfur sources by the low-temperature-resistant sulfur autotrophic microorganisms in the initial stage of starting. Along with the proceeding of sulfur autotrophic denitrification, the low-temperature-resistant sulfur autotrophic microorganisms are gradually domesticated and enriched, and the nitrate nitrogen concentration is gradually reduced in the subsequent stage, so that the method is favorable for enabling the sulfur autotrophic microorganisms to be closer to the nitrate nitrogen concentration of the sewage to be actually treated, gradually increasing the sulfur duty ratio, also achieving the purpose of gradually improving the sulfur utilization efficiency, and saving the reagent cost for stabilizing the sewage after starting. Finally, after the starting stage, the system can stably operate in a low-temperature environment, so that the sewage treatment effect is ensured.
In a word, the starting method provided by the invention is beneficial to rapidly starting the sulfur autotrophic denitrification system and ensuring the stable operation of the sulfur autotrophic denitrification system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows the change in nitrate nitrogen and total nitrogen removal rate of the water inlet and outlet during sulfur autotrophic start-up in the start-up method provided in example 1 of the present invention.
Fig. 2 shows the change in nitrate nitrogen and total nitrogen removal rate of the water inlet and outlet during sulfur autotrophic start-up in the start-up method provided in example 2 of the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As described in the background section of the 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 method for starting a sulfur autotrophic denitrification system in a low-temperature environment, wherein the temperature of the low-temperature environment is 8-16 ℃, and the method comprises the following steps: step S1, inoculating activated sludge into a denitrification device; s2, internal circulation is carried out on the inoculated activated sludge in a denitrification device; 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; s4, introducing second nitrate nitrogen sewage into the denitrification device, adding a second sulfur source, and performing sulfur autotrophic denitrification domestication in a second stage; s5, introducing third nitrate nitrogen sewage into the denitrification device, adding a third sulfur source, performing sulfur autotrophic denitrification domestication in a third stage, and ending a starting procedure; the concentration of nitrate nitrogen in the first nitrate nitrogen sewage, the second nitrate nitrogen sewage and the third nitrate nitrogen sewage is 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 the sulfur in the first sulfur source, the second sulfur source and the third sulfur source is sequentially increased.
The starting method of the sulfur autotrophic denitrification system provided by the invention can effectively start the sulfur autotrophic denitrification system in a low-temperature environment of 8-16 ℃ such as winter, and the time consumption is relatively short. Specifically, after the activated sludge is inoculated to the denitrification device, 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 three-stage sulfur autotrophic denitrification treatment, and takes the mixture of sodium thiosulfate and sulfur 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 faster reaction rate and large gas production by taking sodium thiosulfate as the single sulfur source on the other hand.
It is specially required to explain that the concentration of the nitrate nitrogen in the water in the three stages is gradually decreased, and the sulfur ratio in the sulfur source is gradually increased. The high concentration of nitrate nitrogen in the first stage is beneficial to providing sufficient substrate for sulfur autotrophic microorganisms in the activated sludge for enrichment culture, and the high-duty ratio sodium thiosulfate and the low-duty ratio sulfur ensure the high-efficiency utilization of sulfur sources by the low-temperature-resistant sulfur autotrophic microorganisms in the initial stage of starting. Along with the proceeding of sulfur autotrophic denitrification, the low-temperature-resistant sulfur autotrophic microorganisms are gradually domesticated and enriched, and the nitrate nitrogen concentration is gradually reduced in the subsequent stage, so that the method is favorable for enabling the sulfur autotrophic microorganisms to be closer to the nitrate nitrogen concentration of the sewage to be actually treated, gradually increasing the sulfur duty ratio, also achieving the purpose of gradually improving the sulfur utilization efficiency, and saving the running cost of stabilizing the sewage after starting. Finally, after the starting stage, the system can stably operate in a low-temperature environment, so that the sewage treatment effect is ensured.
In a word, the starting method provided by the invention is beneficial to rapidly starting the sulfur autotrophic denitrification system and ensuring the stable operation of the sulfur autotrophic denitrification system, and is especially suitable for the deep denitrification treatment of the secondary effluent of the urban sewage treatment plant.
In a preferred embodiment, 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; in the third nitrate nitrogen sewage, the concentration of the nitrate nitrogen is 15-25 mg/L. The concentration of the first nitrate nitrogen wastewater is controlled within the range, which is beneficial to more fully promoting the enrichment culture of the sulfur autotrophic microorganisms. The nitrate nitrogen sewage concentration in the last two stages is controlled in the range, so that the nitrate nitrogen concentration is gradually close to the concentration in the actual sewage, and the domestication of the 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 simultaneously 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 meanwhile, the proportion of sulfur in the mixed sulfur source is gradually increased 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 at different stages is more beneficial to playing advantages at different stages, improving the reaction efficiency of running in low-temperature environment in winter, and better preventing the problem of sludge loss caused by excessive gas production.
In a preferred embodiment, in the step S3, the addition amount of the first sulfur source is 590-630 mg/L; in the step S4, the addition amount of the second sulfur source is 200-240 mg/L; in the step S5, the addition amount of the third sulfur source is 100-130 mg/L. The addition amount of the mixed sulfur source in each stage is controlled within the range, so that the advantages of the mixed sulfur source in different proportions can be better exerted, the reaction efficiency of low-temperature operation in winter is ensured, and meanwhile, the problem of sludge loss is better reduced. And (3) domestication is started under the condition of high-concentration nitrate nitrogen in the first stage, so that the aim of rapidly enriching sulfur autotrophic microorganisms is fulfilled. In the domestication process, the concentration of the nitrate nitrogen in the inlet water is gradually reduced, so that the concentration of the nitrate nitrogen in the secondary outlet water of the actual sewage treatment plant is more similar to that of the nitrate nitrogen in the secondary outlet water, the advanced treatment of the secondary outlet water is realized, meanwhile, the proportion of sodium thiosulfate to sulfur powder is continuously adjusted, the proportion of the sulfur powder is increased, and the running cost is greatly saved.
The sulfur autotrophic denitrification system can adopt a system existing in the field, and more preferably adopts a denitrification device disclosed in Chinese patent application CN 106630134A. Preferably, 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. By using an upflow reactor, denitrification can be performed more stably by adjusting the upflow rate of the reflux amount adjusting system.
In the actual operation process, 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 inlet nitrate nitrogen is 0.8-1.3 Kg N/(m) 3 D), when the removal rate of nitrate nitrogen in the effluent reaches 60%, the domestication at the stage can be completed; and/or in the step S4, continuously introducing the second nitrate nitrogen sewage into the water inlet, continuously discharging the second nitrate nitrogen sewage from the water outlet, wherein the volume load of the inlet nitrate nitrogen is 0.40-0.60 Kg N/(m) 3 D), when the removal rate of nitrate nitrogen in the effluent reaches 80%, the domestication at the stage can be completed; and/or in the step S5, continuously introducing the third nitrate nitrogen sewage into the water inlet, continuously discharging the sewage from the water outlet, wherein the volume load of the nitrate nitrogen in the inlet is 0.15-0.25 Kg N/(m) 3 D), when the removal rate of the nitrate nitrogen in the effluent reaches 85%, the domestication at the stage can be completed, and the sulfur autotrophic denitrification system is started successfully. The above-mentioned volume load refers to the nitrate nitrogen load per unit reactor volume. The activated sludge nitrate nitrogen load at each stage in the starting process is controlled within the range, so that the denitrification treatment capacity of the sulfur autotrophic microorganisms at different stages can be better matched, and the sulfur autotrophic microorganisms stably and gradually reach the optimal denitrification state, thereby further improving the starting effect. 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 in each stage (such as adjusting the size of the reflux amount),short flow phenomenon is avoided. For example, the rising flow rate can be controlled to be 1-3 m/h at the initial stage of starting, and the rising flow rate can be gradually raised to more than 3m/h after the running is stable.
The activated sludge may be of a type commonly used in the art, for example, secondary sedimentation tank excess sludge of municipal sewage treatment plants may be used, which contains a certain amount of sulfur autotrophic microorganisms, but in this case, the abundance and activity of the sulfur autotrophic microorganisms are not high. In a preferred embodiment, the activated sludge is a sludge-water mixture, preferably with a sludge concentration of 5-8 g/L; the denitrification device is provided with a reflux pipe, the bottom and the top of the denitrification device are both provided with reflux ports, one end of the reflux pipe is communicated with the reflux port at the bottom, the other end of the reflux pipe is communicated with the reflux port at the top, and the reflux pipe is provided with a peristaltic pump; in the step S1, after inoculating the activated sludge into a denitrification device, standing to enable the activated sludge to form mud-water separation; in step S2, a peristaltic pump is started, so that water in the mud-water mixture circulates internally through a return pipe. By using the up-flow denitrification device, the water in the activated sludge can realize the internal circulation from the return pipe to the denitrification device body by controlling the flow of the peristaltic pump, and the sludge in the process can realize micro-stirring in the water circulation process, so that the sludge is convenient to 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 prepared from wastewater treatment plant secondary sedimentation tank effluent and an additional agent, wherein the additional agent comprises a nitrate nitrogen agent; preferably, the nitrate nitrogen agent is selected from potassium nitrate and/or sodium nitrate. For artificial water distribution, the additive preferably further 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, is used for preparing effluent of a secondary sedimentation tank of a sewage treatment plant for three-stage water inflow, and has the COD concentration of 15-50 mg/L, the total nitrogen concentration of 10-20 mg/L, the ammonia nitrogen concentration of 0.1-2.5 mg/L, the total phosphorus concentration of 0.3-1.0 mg/L and the pH value of 7.4-8.2. After the sulfur autotrophic denitrification system is started, the secondary sedimentation tank effluent of the sewage treatment plant can be stably treated, and the deep denitrification of the secondary sedimentation tank effluent in a low-temperature environment is completed.
The present application is described in further detail below in conjunction with specific embodiments, which should not be construed as limiting the scope of the claims.
Example 1
The denitrification device disclosed in the Chinese patent application CN106630134A is an upflow reactor with a reflux port, the material is organic glass, the effective volume is 12L, a reflux liquid inlet, a water inlet, a mud discharge port and a water distribution pore plate are arranged at the bottom of the reactor, and water inflow and reflux are carried out through a peristaltic pump.
The activated sludge inoculated by the reactor comes from the residual sludge in a secondary sedimentation tank of a municipal sewage treatment plant in Beijing city, and the sludge concentration in the reactor after inoculation reaches 6g/L. Then, the peristaltic pump is used for starting internal circulation, so that the rising flow rate reaches 2.5m/h, and the activated sludge only circularly runs for 2 days without water inflow, so that the activated sludge consumes residual organic matters and dissolved oxygen, and a good autotrophic and anoxic environment is formed.
The actual secondary effluent of the sewage treatment plant is adopted in the test period, 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: COD concentration is 15-50 mg/L, TN concentration is 10-20 mg/L, ammonia nitrogen concentration is 0.1-2.5 mg/L, TP concentration is 0.3-1.0 mg/L, and pH value is about 7.4-8.2.
The first stage is a high load starting stage, the average concentration of nitrate nitrogen in the inlet water is 98mg/L, the concentration of added sulfur powder is 130mg/L, the concentration of sodium thiosulfate is 480mg/L, the rising flow rate is 2m/h, the average concentration of nitrate nitrogen in the outlet water is 50.4mg/L, and the nitrate nitrogen removal load is 0.47kg N/(m) 3 D) the nitrate nitrogen removal rate (NRE) reaches 61.8%, the stage is a high-concentration nitrate nitrogen water inlet condition, and the average water temperature is 8.1 ℃, so that the nitrate nitrogen removal rate can reach 61.8%, which indicates that the sulfur autotrophic denitrifying bacteria in the system are gradually adapted to low-temperature environment and have certain metabolic activityThe sulfur autotrophic denitrification system is basically successful to start up, but still needs to be enhanced. The second stage is a medium-load operation stage, the average concentration of nitrate nitrogen in the inlet water is 44mg/L, the concentration of the added sulfur powder is 65mg/L, the concentration of sodium thiosulfate is 150mg/L, the average concentration of nitrate nitrogen in the outlet water of the whole second stage is 16.6mg/L, and the nitrate nitrogen removal load is 0.27kg N/(m) 3 D) the nitrate Nitrogen Removal (NRE) reached 83.9%. The third stage is a low load operation stage, which takes 15 days, the average concentration of the nitrate 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 nitrogen in the outlet water is 3.0mg/L, and the nitrate nitrogen removal load is 0.22kg N/(m) 3 D) the nitrate nitrogen removal rate (NRE) is 88.3%, the concentration of the nitrate nitrogen in the inlet water at the stage is relatively close to the concentration of the nitrate nitrogen in the outlet water after the nitrification of the real domestic sewage is finished, and the concentration of the nitrate nitrogen in the outlet water is stably maintained below 5mg/L. The starting process in low temperature environment of 8-16deg.C in winter is completed in 49 days, and the change of nitrate nitrogen and total nitrogen removal rate in water inlet and outlet during sulfur autotrophic starting is shown in figure 1, wherein Inf. NO 3- -N represents the nitrate nitrogen concentration of the feed water, eff. NO 3- -N represents the effluent nitrate nitrogen concentration.
Example 2
The denitrification device disclosed in the Chinese patent application CN106630134A is an upflow reactor with a reflux port, the material is organic glass, the effective volume is 12L, a reflux liquid inlet, a water inlet, a mud discharge port and a water distribution pore plate are arranged at the bottom of the reactor, and water inflow and reflux are carried out through a peristaltic pump. Compared with example 1, this example shows some variation in sludge concentration, nitrate nitrogen concentration at each stage, and sulfur source addition amount.
The activated sludge inoculated by the reactor comes from the residual sludge in a secondary sedimentation tank of a municipal sewage treatment plant in Beijing city, and the sludge concentration in the reactor after inoculation reaches 8g/L. Then, the peristaltic pump is used for starting internal circulation, so that the rising flow rate reaches 3m/h, and the activated sludge only circularly runs for 3 days without water inflow, so that the activated sludge consumes residual organic matters and dissolved oxygen, and a good autotrophic and anoxic environment is formed.
The actual secondary effluent of the sewage treatment plant is adopted in the test period, 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: COD concentration is 15-50 mg/L, TN concentration is 10-20 mg/L, ammonia nitrogen concentration is 0.1-2.5 mg/L, TP concentration is 0.3-1.0 mg/L, and pH value is about 7.4-8.2.
The first stage is a high load starting stage, which takes 14 days, the average concentration of the nitrate nitrogen in the inlet water is 130mg/L, the concentration of the added sulfur powder is 130mg/L, the concentration of the sodium thiosulfate is 500mg/L, the average concentration of the nitrate nitrogen in the outlet water is 65.6mg/L, and the nitrate nitrogen removal load is 0.64kg N/(m) 3 D) the nitrate Nitrogen Removal (NRE) reached 65.9%. The second stage is a medium-load operation stage, the average concentration of nitrate nitrogen in the inlet water is 59mg/L, the concentration of the added sulfur powder is 65mg/L, the concentration of sodium thiosulfate is 180mg/L, the average concentration of nitrate nitrogen in the outlet water of the whole second stage is 19.3mg/L, and the nitrate nitrogen removal load is 0.40kg N/(m) 3 D) the nitrate Nitrogen Removal (NRE) reached 82.1%. The third stage is a low load operation stage, which takes 11 days, the average concentration of the nitrate nitrogen in the inlet water is 16mg/L, the concentration of the added sulfur powder is 50mg/L, the concentration of the sodium thiosulfate is 50mg/L, the average concentration of the nitrate nitrogen in the outlet water is 2.6mg/L, and the nitrate nitrogen removal load is 0.14kg N/(m) 3 D), the nitrate nitrogen removal rate (NRE) reaches 90.0%, the concentration of the nitrate nitrogen in the inlet water at the stage is relatively close to that of the nitrate nitrogen in the outlet water after the nitrification of the real domestic sewage is finished, and the concentration of the nitrate nitrogen in the outlet water is stably maintained below 3 mg/L. The starting process under the low-temperature environment of 8-16 ℃ in the whole winter is completed in 45 days, the change condition of nitrate nitrogen and total nitrogen removal rate of water inlet and outlet during the sulfur autotrophic starting is shown in figure 2, wherein Inf. NO 3- -N represents the nitrate nitrogen concentration of the feed water, eff. NO 3- -N represents the effluent nitrate nitrogen concentration.
Comparative example 1
The test apparatus, water quality source, sludge source and ambient temperature of this comparative example were all the same as those of the two examples, except that this comparative example was tested using only sulfur powder as the sole sulfur source.
The activated sludge inoculated by the reactor comes from the residual sludge in a secondary sedimentation tank of a municipal sewage treatment plant in Beijing city, and the sludge concentration in the reactor after inoculation reaches 8g/L. Then, the peristaltic pump is used for starting internal circulation, so that the rising flow rate reaches 3m/h, and the activated sludge only circularly runs for 3 days without water inflow, so that the activated sludge consumes residual organic matters and dissolved oxygen, and a good autotrophic and anoxic environment is formed.
The first stage is a high load starting stage, the total time is 28 days, the average concentration of nitrate nitrogen in inlet water is 105mg/L, the concentration of sulfur powder added is 300mg/L, the average concentration of nitrate nitrogen in outlet water is 68.3mg/L, and the nitrate nitrogen removal load reaches 0.64kg N/(m) 3 D) the nitrate Nitrogen Removal (NRE) reached 60.6%. The second stage is a medium-load operation stage, the average concentration of nitrate nitrogen in the inlet water is 52mg/L, the concentration of sulfur powder added is 150mg/L, the average concentration of nitrate nitrogen in the outlet water of the whole second stage is 17.5mg/L, and the nitrate nitrogen removal load reaches 0.43kg N/(m) 3 D) the nitrate Nitrogen Removal (NRE) reached 83.2%. The third stage is a low load operation stage, which takes 25 days, the average concentration of the nitrate nitrogen in the inlet water is 20mg/L, the concentration of the sulfur powder added is 70mg/L, the average concentration of the nitrate nitrogen in the outlet water is 2.9mg/L, and the nitrate nitrogen removal load reaches 0.18kg N/(m) 3 D), the nitrate nitrogen removal rate (NRE) reaches 89.5%, the concentration of the nitrate nitrogen in the inlet water at the stage is relatively close to that of the nitrate nitrogen in the outlet water after the nitrification of the real domestic sewage is finished, and the concentration of the nitrate nitrogen in the outlet water is stably maintained below 5mg/L. The whole starting process in winter at the low temperature of 8-16 ℃ is completed in 83 days, and the comparison example 1 shows that the sulfur autotrophic denitrification process using single sulfur powder as a sulfur source requires longer domestication time.
Comparative example 2
The test apparatus, water quality source, sludge source and ambient temperature of this comparative example were all the same as the two examples, except that this comparative example was always acclimated with sludge using a low nitrogen loading, the sulfur source still being a mixture of sulfur powder and sodium thiosulfate.
The activated sludge inoculated by the reactor comes from the residual sludge in a secondary sedimentation tank of a municipal sewage treatment plant in Beijing city, and the sludge concentration in the reactor after inoculation reaches 8g/L. Then, the peristaltic pump is used for starting internal circulation, so that the rising flow rate reaches 3m/h, and the activated sludge only circularly runs for 3 days without water inflow, so that the activated sludge consumes residual organic matters and dissolved oxygen, and a good autotrophic and anoxic environment is formed.
The average concentration of nitrate nitrogen in the inlet water is 25mg/L, the concentration of the added sulfur powder is 50mg/L, and the concentration of sodium thiosulfate is 50mg/L, and the sludge is acclimatized under the condition. The nitrate nitrogen concentration of the effluent at the 5 th day is 20mg/L, and the removal rate is 20%; the nitrate nitrogen concentration of the effluent at the 20 th day is 17mg/L, and the removal rate is 32%; the nitrate nitrogen concentration of the effluent at the 38 th day is 10mg/L, and the removal rate reaches 60%; the nitrate nitrogen concentration of the effluent at the 58 th day is 6mg/L, and the removal rate reaches 76%; the nitrate nitrogen concentration of the outlet water at the 75 th day is 2.6mg/L, and the removal rate reaches 90%. Under the environment of low temperature of 8-16 ℃, 75 days are required for starting the sulfur autotrophic denitrification process by adopting a low-nitrate-nitrogen-load domestication mode, and longer domestication time is required compared with the domestication mode of gradually reducing the concentration of nitrate nitrogen in water.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
the method realizes the quick starting process of the sulfur autotrophic denitrification system in a low-temperature environment in winter;
the invention adopts the mixed sulfur source with the optimal proportion, thereby not only guaranteeing the quick starting effect of the sulfur autotrophic denitrification system, but also realizing the purpose of saving the running cost of the medicament.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for starting the sulfur autotrophic denitrification system in the low-temperature environment is characterized by comprising the following steps of:
step S1, inoculating activated sludge into a denitrification device;
s2, internal circulation is carried out on the inoculated activated sludge in the denitrification device;
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;
s4, introducing second nitrate nitrogen sewage into the denitrification device, adding a second sulfur source, and performing sulfur autotrophic denitrification domestication in a second stage;
s5, introducing third nitrate nitrogen sewage into the denitrification device, adding a third sulfur source, performing sulfur autotrophic denitrification domestication in a third stage, and ending a starting procedure;
the concentration of nitrate nitrogen in the first nitrate nitrogen sewage, the second nitrate nitrogen sewage and the third nitrate nitrogen sewage is 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 proportion of sulfur in the first sulfur source, the second sulfur source and the third sulfur source is sequentially increased;
in the first sulfur source, the weight ratio of the sodium thiosulfate to the 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;
in the step S3, the total adding amount of the first sulfur source is 590-630 mg/L; in the step S4, the total addition amount of the second sulfur source is 200-240 mg/L; in the step S5, the total addition amount of the third sulfur source is 100-130 mg/L.
2. The method for starting a sulfur autotrophic denitrification system in a low-temperature environment according to claim 1, wherein the concentration of nitrate nitrogen in the first nitrate nitrogen sewage 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.
3. The method for starting a sulfur autotrophic denitrification system in a low temperature environment according to any one of claims 1 or 2, wherein the denitrification device has a vertical up-flow structure, a water inlet is arranged at the bottom of the denitrification device, and a water outlet is arranged at the top of the denitrification device;
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 nitrate nitrogen content is introducedThe product load is 0.80-1.30 Kg N/(m) 3 D), finishing the domestication of the stage when the removal rate of the nitrate nitrogen in the effluent reaches 60%; 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 inlet nitrate nitrogen is 0.40-0.60 Kg N/(m) 3 D), finishing the domestication of the stage when the removal rate of the nitrate nitrogen in the effluent reaches 80%; 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 the nitrate nitrogen in the effluent reaches 85%, finishing all domestication processes, and starting the sulfur autotrophic denitrification system successfully.
4. A method of starting up a sulfur autotrophic denitrification system in a low temperature environment according to claim 3, wherein the activated sludge is a sludge water mixture; the denitrification device is provided with a reflux pipe, the bottom and the top of the denitrification device are both provided with reflux ports, one end of the reflux pipe is communicated with the reflux port at the bottom, the other end of the reflux pipe is communicated with the reflux port at the top, and a peristaltic pump is arranged on the reflux pipe;
in the step S1, after the activated sludge is inoculated into a denitrification device, standing is carried out, so that the activated sludge is subjected to sludge-water separation; in the step S2, the peristaltic pump is started, so that the water in the mud-water mixture circulates through the return pipe.
5. The method for starting a sulfur autotrophic denitrification system in a low-temperature environment according to claim 4, wherein the sludge concentration of the activated sludge is 5-8 g/L.
6. The method for starting up a sulfur autotrophic denitrification system in a low temperature environment according to claim 4, wherein the internal circulation time is 1-3 days.
7. The method for starting up a sulfur autotrophic denitrification system in a low temperature environment according to claim 1 or 2, wherein the first nitrate nitrogen wastewater, the second nitrate nitrogen wastewater and the third nitrate nitrogen wastewater are prepared from secondary sedimentation tank effluent of a sewage treatment plant and an external agent, wherein the external agent comprises a nitrate nitrogen agent.
8. The method for starting up a sulfur autotrophic denitrification system according to claim 7, wherein the nitrate nitrogen agent is selected from potassium nitrate and/or sodium nitrate.
9. The method of claim 8, wherein the additional agent further comprises one or more of sodium bicarbonate and potassium dihydrogen phosphate.
10. The method for starting a sulfur autotrophic denitrification system in a low-temperature environment according to claim 7, 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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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109052639A (en) * | 2018-07-27 | 2018-12-21 | 杭州师范大学 | A kind of cultural method of high performance synchronous denitrification and desulfurization anaerobic sludge |
| CN110950428A (en) * | 2019-11-22 | 2020-04-03 | 重庆大学 | Method for culturing sludge with synchronous sulfur autotrophic denitrification and anaerobic ammonia oxidation functions |
| CN114409096A (en) * | 2022-01-19 | 2022-04-29 | 中山大学 | Method for realizing efficient deep denitrification of sewage by coupling elemental sulfur disproportionation and sulfur autotrophic denitrification |
-
2022
- 2022-06-15 CN CN202210676378.8A patent/CN115124139B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109052639A (en) * | 2018-07-27 | 2018-12-21 | 杭州师范大学 | A kind of cultural method of high performance synchronous denitrification and desulfurization anaerobic sludge |
| CN110950428A (en) * | 2019-11-22 | 2020-04-03 | 重庆大学 | Method for culturing sludge with synchronous sulfur autotrophic denitrification and anaerobic ammonia oxidation functions |
| CN114409096A (en) * | 2022-01-19 | 2022-04-29 | 中山大学 | Method for realizing efficient deep denitrification of sewage by coupling elemental sulfur disproportionation and sulfur autotrophic denitrification |
Non-Patent Citations (4)
| Title |
|---|
| "外源电子供体增效低温硫自养反硝化脱氮运行性能优化";徐晓红;《中国优秀硕士学位论文数据库 工程科技I辑》(第3期);第45页第3.1节-65页第3.5节 * |
| 低温对硫自养反硝化脱氮系统的影响及调控措施;缪博;蒋永;刘攀攀;王东麟;郝雯;梁鹏;黄霞;;中国给水排水(05);全文 * |
| 硫自养反硝化反应器脱氮特性研究;张晨晓;郭延凯;杜海峰;张超;王思慧;廉静;郭建博;;河北科技大学学报;第37卷(第1期);第97页第1节-100页第3节 * |
| 硫自养反硝化同步脱氮除硫启动试验;李军;张文文;王立军;田文婷;;沈阳建筑大学学报(自然科学版)(01);全文 * |
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