CN114516706A - Wastewater treatment method and system - Google Patents
Wastewater treatment method and system Download PDFInfo
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- CN114516706A CN114516706A CN202210101207.2A CN202210101207A CN114516706A CN 114516706 A CN114516706 A CN 114516706A CN 202210101207 A CN202210101207 A CN 202210101207A CN 114516706 A CN114516706 A CN 114516706A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 123
- 239000002351 wastewater Substances 0.000 claims abstract description 87
- 238000006243 chemical reaction Methods 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000005086 pumping Methods 0.000 claims abstract description 27
- 238000000926 separation method Methods 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000011259 mixed solution Substances 0.000 claims abstract description 15
- 239000008394 flocculating agent Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims abstract description 9
- 239000002244 precipitate Substances 0.000 claims abstract description 8
- 238000004062 sedimentation Methods 0.000 claims description 34
- 239000010802 sludge Substances 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 238000009826 distribution Methods 0.000 claims description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 8
- 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 description 7
- 238000005273 aeration Methods 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 241000894006 Bacteria Species 0.000 claims description 6
- 244000005700 microbiome Species 0.000 claims description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000002957 persistent organic pollutant Substances 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 230000001546 nitrifying effect Effects 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract 1
- 238000005189 flocculation Methods 0.000 abstract 1
- 230000016615 flocculation Effects 0.000 abstract 1
- 239000013049 sediment Substances 0.000 description 15
- 239000003344 environmental pollutant Substances 0.000 description 9
- 231100000719 pollutant Toxicity 0.000 description 9
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a wastewater treatment method, which comprises S1, collecting production wastewater, stirring and mixing the production wastewater uniformly to obtain a wastewater uniformly-mixed solution, and further stirring and treating the mixed wastewater uniformly-mixed solution; s2, further treating the wastewater mixed solution after further stirring treatment to obtain a pretreatment solution; s3, pumping the pretreatment liquid into a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank successively to react to obtain two-stage treatment liquid; s4, performing primary mud-water separation on the two-stage treatment liquid, discharging a generated first precipitate, and adding a flocculating agent into the first clarified liquid; s5, carrying out secondary mud-water separation on the first clarified liquid after the flocculation reagent treatment, discharging a generated second precipitate, and discharging the second clarified liquid. The method degrades organic matters in the wastewater under anaerobic conditions, utilizes the denitrification and nitrification tanks for further treatment, utilizes the physicochemical reaction tank for removing suspended matters, finally settles and discharges after reaching standards, and has simple and convenient treatment process and low operation cost.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment method and a wastewater treatment system.
Background
N-methyl pyrrolidone is an organic matter, and the wastewater containing the N-methyl pyrrolidone belongs to high-concentration organic wastewater which is difficult to degrade, has heavy peculiar smell and toxicity, causes serious pollution to the environment by direct discharge, and has high biochemical treatment difficulty.
At present, the wastewater containing N-methyl pyrrolidone is generally treated by adopting a photocatalysis method, an ozone oxidation and other advanced oxidation methods or a membrane separation method. The wastewater containing N-methyl pyrrolidone treated by physical and chemical methods such as advanced oxidation, membrane separation and the like has high cost, serious secondary pollution, large occupied area of equipment and complex process, and under the current strict environmental protection law, a wastewater treatment method and a wastewater treatment system need to be developed, so that the treated wastewater can reach the discharge standard specified by the state.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wastewater treatment method and a wastewater treatment system, which can utilize a wastewater collection tank to homogenize water quality and water quantity, degrade organic matters in wastewater under an anaerobic condition, further treat effluent in a denitrification and nitrification tank, remove suspended matters in effluent of a secondary sedimentation tank in a physicochemical reaction tank, finally discharge the effluent after reaching the standard through sedimentation, and are simple and easy to realize. The treatment process has the advantages of simple and convenient flow and low operation cost.
In order to solve the technical problem, the invention provides a method for treating N-methyl pyrrolidone production wastewater, which comprises the following steps: s1, pouring the production wastewater into a wastewater collection tank, stirring the production wastewater in the wastewater collection tank until the production wastewater is uniformly mixed to obtain a wastewater uniformly-mixed liquid, blending the wastewater uniformly-mixed liquid until the water quality, water quantity, water temperature and pH value of the wastewater uniformly-mixed liquid reach preset values, and pumping the blended wastewater uniformly-mixed liquid into an anaerobic water distribution tank; s2, pumping the wastewater mixed solution treated by the anaerobic distribution tank into an anaerobic reaction tower for further treatment so as to degrade organic matters in the wastewater mixed solution, thereby obtaining a pretreatment solution; s3, pumping the pretreatment liquid into a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank successively to react to obtain two-stage treatment liquid; s4, pumping the two-stage treatment liquid into a secondary sedimentation tank for primary mud-water separation; the two-stage treatment liquid is subjected to primary sludge-water separation to generate a first precipitate and a first clarified liquid, the first precipitate is discharged into a sludge tank, the first clarified liquid is pumped into a physicochemical reaction tank, and a flocculating agent is added into the physicochemical reaction tank to reduce suspended matters and chemical oxygen demand in the first clarified liquid; s5, pumping the first clarified liquid treated by the flocculating agent in the step S4 into a materialized sedimentation tank for secondary mud-water separation, wherein the first clarified liquid is subjected to secondary mud-water separation to generate a second sediment and a second clarified liquid, the second sediment is discharged into the sludge tank, and the second clarified liquid is discharged after reaching the standard.
Preferably, in S3, the step of pumping the pretreatment solution into the first-stage denitrification tank, the first-stage nitrification tank, the second-stage denitrification tank, and the second-stage nitrification tank successively to perform the reaction includes: pumping the pretreatment liquid into a primary denitrification tank, and reducing nitrate nitrogen in the pretreatment liquid into nitrogen by denitrifying bacteria in the primary denitrification tank under an anoxic state so as to remove nitrogen in the pretreatment liquid to obtain pretreatment liquid A; pumping the pretreatment liquid A into a primary nitrification tank, and oxidizing ammonia nitrogen in the pretreatment liquid A into nitrate nitrogen by nitrifying bacteria in the primary nitrification tank under an aerobic state to obtain pretreatment liquid B; the pretreatment liquid B flows back to the primary denitrification tank to further remove nitrogen in the pretreatment liquid B to obtain a pretreatment liquid C; pumping the pretreatment liquid C into a secondary denitrification tank, and decomposing and breaking long-chain macromolecular organic matters in the pretreatment liquid C by facultative microorganisms in the secondary denitrification tank to obtain pretreatment liquid D; and pumping the pretreatment liquid D into a secondary nitrification tank, adding activated sludge into the secondary nitrification tank to decompose organic pollutants in the pretreatment liquid D, and finally obtaining two-stage treatment liquid.
Preferably, the operating temperature of the first-stage nitrification tank and the second-stage nitrification tank is 32-35 ℃.
Preferably, in S4, the flocculating agent is polyaluminium chloride and acrylamide homopolymer.
Preferably, in the step S4, the time for primary sludge-water separation in the secondary sedimentation tank is 3-5 h.
Preferably, in S2, the retention time of the wastewater mixed solution after being treated in the anaerobic distribution basin in the anaerobic reaction tower is 6.5 days, and the operating temperature in the anaerobic reaction tower is 35 to 38 ℃.
Preferably, in S1, an aeration device is additionally disposed in the wastewater collection tank to further homogenize the wastewater blending liquid.
A treatment system for N-methylpyrrolidone production wastewater is preferably provided, wherein an outlet end of a wastewater collection tank is connected with an inlet end of an anaerobic distribution tank through a wastewater lifting pump; the anaerobic reaction tower, the entrance of the said anaerobic reaction tower is connected with exit end of the anaerobic distribution pool, the exit of the said anaerobic reaction tower is connected to the entrance of the first-class denitrification pool, the exit of the first-class denitrification pool is connected with entrance of the first-class nitrification pool, the exit of the first-class nitrification pool is connected with entrance of the second-class denitrification pool, the exit of the second-class denitrification pool is connected with entrance of the second-class nitrification pool; the outlet of the secondary nitrification tank is connected with the inlet of the secondary sedimentation tank, the outlet of the secondary sedimentation tank is connected with the inlet of the materialization reaction tank, the outlet of the materialization reaction tank is connected with the inlet of the materialization sedimentation tank, and the outlet of the materialization sedimentation tank is connected with the inlet of the clean water tank.
Preferably, the device also comprises a sludge tank, and the secondary sedimentation tank and the materialized sedimentation tank are both communicated with the sludge tank through a sludge pump.
Preferably, a three-phase separator is arranged at the top of the anaerobic reaction tower.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. according to the invention, the wastewater mixed liquor treated by the anaerobic distribution tank is pumped into the anaerobic reaction tower for further treatment, so that macromolecular pollutants in the wastewater mixed liquor can be changed into micromolecular pollutants, pollutants which are difficult to degrade can be changed into pollutants which are easy to degrade, organic matters in the wastewater mixed liquor can be greatly removed by anaerobic microorganisms in the anaerobic tower, and the biodegradability of the wastewater is improved.
2. According to the invention, the primary denitrification tank, the primary nitrification tank, the secondary denitrification tank and the secondary nitrification tank are arranged, so that the total nitrogen removal rate of the pretreatment liquid can be improved, long-chain macromolecular organic matters which are difficult to degrade in the pretreatment liquid are decomposed and broken, and are degraded into small molecular substances which are easy to decompose, and organic pollutants in the pretreatment liquid are removed.
3. According to the invention, the physicochemical reaction tank is further arranged, and the flocculating agent is added into the physicochemical reaction tank, so that suspended matters and COD in the wastewater can be further reduced, and the wastewater is discharged after reaching the standard.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of the system of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1 to 2, the invention discloses a wastewater treatment method and a wastewater treatment system.
A wastewater treatment method specifically comprises the following steps:
the method comprises the following steps: pouring the production wastewater into a wastewater collection tank, uniformly stirring and mixing the wastewater in the wastewater collection tank to obtain a wastewater uniformly-mixed solution, blending the water quality, water quantity, water temperature and pH of the wastewater uniformly-mixed solution to obtain preset values, and pumping the blended wastewater uniformly-mixed solution into an anaerobic water distribution tank.
Wherein, all be provided with the aeration in waste water collecting tank and the anaerobism water distribution pond, can further stir even quality of water, the flow is shorter, moves simply.
And step two, pumping the wastewater mixed solution treated by the anaerobic distribution tank in the step one into an anaerobic reaction tower for further treatment, wherein a water outlet of the anaerobic distribution tank is connected with a water inlet of the anaerobic reaction tower through a pump, so that macromolecular pollutants in the wastewater mixed solution are changed into micromolecular pollutants, pollutants which are difficult to degrade are changed into pollutants which are easy to degrade, organic matters are greatly removed by anaerobic microorganisms in the anaerobic reaction tower, the biodegradability of the wastewater mixed solution is improved, and finally the pretreatment solution is obtained.
The anaerobic reaction tower is internally provided with a circulating pump to ensure that the wastewater mixing liquid fully reacts with sludge in the anaerobic reaction tower, in another preferred embodiment, the retention time of the wastewater mixing liquid in the anaerobic reaction tower is 6-7d, preferably 6.5d, the operating temperature in the anaerobic reaction tower is 35-38 ℃, the top of the anaerobic reaction tower is provided with a three-phase separator, organic matters in the wastewater mixing liquid can be degraded under anaerobic conditions, and the subsequent further treatment is facilitated.
And step three, pumping the pretreatment liquid flowing out of the anaerobic reaction tower into a two-stage A/O biochemical unit for further treatment. Wherein, the two-stage A/O biochemical unit is a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank which are connected in sequence, and two-stage treatment liquid is finally obtained.
Specifically, the method comprises the following steps: (1) and pumping the pretreatment liquid into a primary denitrification tank, and reducing nitrate nitrogen in the pretreatment liquid into nitrogen by denitrifying bacteria in the primary denitrification tank under an anoxic state so as to remove nitrogen in the pretreatment liquid, thereby obtaining pretreatment liquid A. Pumping the pretreatment liquid A into a primary nitrification tank, and oxidizing ammonia nitrogen in the pretreatment liquid A into nitrate nitrogen by nitrifying bacteria in the primary nitrification tank under an aerobic state to obtain pretreatment liquid B. And refluxing the pretreatment solution B into a first-stage denitrification tank to further remove nitrogen in the pretreatment solution B to obtain a pretreatment solution C. The total nitrogen removal rate of the finally obtained pretreatment liquid C can be improved through alternative state treatment of the reaction of the first-stage denitrification tank in an anoxic state and the reaction of the first-stage nitrification tank in an aerobic state.
And pumping the pretreatment liquid C into a second-stage denitrification tank, decomposing and breaking long-chain macromolecular organic matters which are difficult to degrade in the wastewater in the pretreatment liquid C by facultative microorganisms in the second-stage denitrification tank, and degrading the long-chain macromolecular organic matters into micromolecular substances which are easy to decompose so as to be beneficial to subsequent biochemical reaction, thereby finally obtaining the pretreatment liquid D. Pumping the pretreatment liquid D into a secondary nitrification tank, adding activated sludge into the secondary nitrification tank to decompose organic pollutants in the pretreatment liquid D, and finally obtaining a two-stage treatment liquid.
In another preferred embodimentThe method comprises the following steps: the hydraulic retention time in the first-stage denitrification tank is 17h, a submersible stirrer is arranged in the first-stage denitrification tank, so that the water quality is more uniform, and the power of the submersible stirrer is 44w/m3And an alkali adding device is arranged in the first-stage denitrification tank for adjusting the pH value. The hydraulic retention time in the primary nitrification tank is preferably 3.4d, the operation temperature is 32-35 ℃, and the organic load is 0.4 kgCOD/(m)3D), the air volume of an aeration device arranged in the primary nitrification tank is 10.65m/min, ammonia nitrogen in the pretreatment liquid A can be stably oxidized into nitrate nitrogen, and a reflux pump is arranged in the primary nitrification tank to realize the reflux of the pretreatment liquid B in the primary nitrification tank to the primary denitrification tank. The hydraulic retention time in the secondary denitrification tank is 15 h. A submersible stirrer is arranged in the secondary denitrification tank, and the power of the submersible stirrer is 46w/m3. The hydraulic retention time in the secondary nitrification tank is 2d, the operation temperature is 32-35 ℃, and the organic load is 0.4 kgCOD/(m)3D), the secondary nitrification tank and the primary nitrification tank share aeration, and long-chain macromolecular organic matters which are difficult to degrade in the wastewater can be decomposed and broken, so that the long-chain macromolecular organic matters are degraded into micromolecular substances which are easy to decompose.
Most pollutants in the N-methyl pyrrolidone production wastewater can be removed through the anaerobic distribution tank and the two-stage A/O biochemical unit, the treatment effect is good, the flow is short, and the operation and management are convenient.
Pumping the two-stage treatment liquid into a secondary sedimentation tank, wherein the secondary sedimentation tank is used for primary mud-water separation, the two-stage treatment liquid is subjected to primary mud-water separation to generate a first sediment and a first clarified liquid, the first sediment is discharged into a sludge tank, the first clarified liquid is pumped into a physicochemical reaction tank, a flocculating agent is added into the physicochemical reaction tank, and the flocculating agent reacts with the first clarified liquid to reduce suspended matters and chemical oxygen demand in the first clarified liquid.
Among them, the flocculating agent is preferably a polyaluminum chloride agent and an acrylamide homopolymer agent.
In another preferred embodiment, the sedimentation time of the secondary sedimentation tank is 3-5h, so that the mud-water separation effect is better, and the mud scraper ZXGN-3.0 is arranged in the secondary sedimentation tank, and a mud discharge pump is arranged, so that the first sediment is discharged into the sludge tank.
And step five, pumping the first clarified liquid treated by the flocculating agent into a physicochemical sedimentation tank for secondary mud-water separation, generating second sediment and second clarified liquid after the secondary mud-water separation, discharging the second sediment into a sludge tank, and discharging the second clarified liquid which reaches the standard.
Aeration stirring is arranged in the sludge tank, and sediment in the sludge tank is pumped into a filter press for filter pressing and then entrusted with qualified unit treatment.
The method can utilize the wastewater collection tank to homogenize the quality and quantity of water, degrade organic matters in the wastewater under anaerobic conditions, further treat the effluent in the denitrification and nitrification tanks, remove suspended matters from the effluent in the secondary sedimentation tank in the physicochemical reaction tank, finally discharge the effluent after sedimentation to reach the standard, and ensure that the treated wastewater can reach the discharge standard specified by the state.
The invention also discloses a wastewater treatment system.
The processing system comprises: waste water collecting tank, waste water collecting tank's exit end passes through the waste water elevator pump and is connected with the entry end of anaerobism distribution pool, stirs the waste water that obtains to the collection in waste water collecting tank until the mixing in order to obtain waste water mixing liquid, carries out the allotment until its quality of water, water yield, temperature and pH reach the default to waste water mixing liquid, and the anaerobism distribution pool is under anaerobic condition, further stirs the processing with the waste water mixing liquid after the allotment. And an inlet of the anaerobic reaction tower is connected with an outlet end of the anaerobic distribution tank, and the wastewater blending liquid after being further stirred in the anaerobic reaction tower is further treated to degrade organic matters in the wastewater blending liquid to obtain a pretreatment liquid. The outlet of the anaerobic reaction tower is connected to the inlet of the first-stage denitrification tank, the outlet of the first-stage denitrification tank is connected with the inlet of the first-stage nitrification tank, the outlet of the first-stage nitrification tank is connected with the inlet of the second-stage denitrification tank, the outlet of the second-stage denitrification tank is connected with the inlet of the second-stage nitrification tank, the pretreatment liquid is pumped into the first-stage denitrification tank, the first-stage nitrification tank, the second-stage denitrification tank and the second-stage nitrification tank one by one to react, and two-stage treatment liquid is obtained. Further, the outlet of the secondary nitrification tank is connected with the inlet of the secondary sedimentation tank, the outlet of the secondary sedimentation tank is connected with the inlet of the physicochemical reaction tank, performing primary sludge-water separation on the two-stage treatment liquid in a secondary sedimentation tank, performing primary sludge-water separation on the two-stage treatment liquid to generate first sediment and first clarified liquid, discharging the first sediment, pumping the first clarified liquid into a physicochemical reaction tank, adding a flocculating agent into the physicochemical reaction tank to reduce suspended matters and chemical oxygen demand in the first clarified liquid, connecting an outlet of the physicochemical reaction tank with an inlet of the physicochemical sedimentation tank, connecting an outlet of the physicochemical sedimentation tank with an inlet of a clean water tank, and (3) carrying out secondary mud-water separation on the first clarified liquid treated by the flocculating agent in the physicochemical sedimentation tank, carrying out secondary mud-water separation on the first clarified liquid to generate second sediment and second clarified liquid, discharging the second sediment, and discharging the second clarified liquid to a clean water tank.
The treatment system further comprises a sludge tank, wherein the secondary sedimentation tank and the materialized sedimentation tank are communicated with the sludge tank through a sludge pump, so that the first sediment and the second sediment can be discharged into the sludge tank, aeration stirring is arranged in the sludge tank, and sediment in the sludge tank is pumped into a unit with qualification after being filter-pressed by a filter press.
The wastewater treatment system is used for executing the wastewater treatment method.
After a large number of experiments, the treatment effect of the system is shown in table 1 below.
TABLE 1 treatment Effect of the wastewater treatment System
Therefore, the wastewater treatment system has a good treatment effect on the wastewater containing the N-methyl pyrrolidone, the treated wastewater can be discharged after reaching the standard, the treatment process is simple and convenient, and the operation cost is low.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A method of wastewater treatment, comprising the steps of:
s1, collecting the production wastewater, stirring the collected production wastewater until the production wastewater is uniformly mixed to obtain a wastewater uniform mixing liquid, blending the wastewater uniform mixing liquid until the water quality, the water quantity, the water temperature and the pH value of the wastewater uniform mixing liquid reach preset values, and further stirring the blended wastewater uniform mixing liquid in an anaerobic state;
s2, further treating the wastewater mixed solution after further stirring treatment to degrade organic matters in the wastewater mixed solution to obtain a pretreatment solution;
s3, pumping the pretreatment liquid into a first-stage denitrification tank, a first-stage nitrification tank, a second-stage denitrification tank and a second-stage nitrification tank successively to react to obtain two-stage treatment liquid;
s4, carrying out primary sludge-water separation on the two-stage treatment liquid; the two-stage treatment liquid is subjected to primary sludge-water separation to generate a first precipitate and a first clarified liquid, the first precipitate is discharged, and a flocculating agent is added into the first clarified liquid to reduce suspended matters and chemical oxygen demand in the first clarified liquid;
and S5, carrying out secondary sludge-water separation on the first clarified liquid treated by the flocculating agent in the step S4, carrying out secondary sludge-water separation on the first clarified liquid to generate a second precipitate and a second clarified liquid, discharging the second precipitate, and discharging the second clarified liquid.
2. The wastewater treatment method according to claim 1, wherein in S3, the specific steps of pumping the pretreatment liquid into the first-stage denitrification tank, the first-stage nitrification tank, the second-stage denitrification tank and the second-stage nitrification tank one by one for reaction are as follows:
pumping the pretreatment liquid into a primary denitrification tank, and reducing nitrate nitrogen in the pretreatment liquid into nitrogen by denitrifying bacteria in the primary denitrification tank under an anoxic state so as to remove nitrogen in the pretreatment liquid to obtain pretreatment liquid A;
pumping the pretreatment liquid A into a primary nitrification tank, and oxidizing ammonia nitrogen in the pretreatment liquid A into nitrate nitrogen by nitrifying bacteria in the primary nitrification tank under an aerobic state to obtain pretreatment liquid B;
the pretreatment liquid B flows back to the primary denitrification tank to further remove nitrogen in the pretreatment liquid B to obtain a pretreatment liquid C;
pumping the pretreatment liquid C into a secondary denitrification tank, and decomposing and breaking long-chain macromolecular organic matters in the pretreatment liquid C by facultative microorganisms in the secondary denitrification tank to obtain pretreatment liquid D;
and pumping the pretreatment liquid D into a secondary nitrification tank, adding activated sludge into the secondary nitrification tank to decompose organic pollutants in the pretreatment liquid D, and finally obtaining a two-stage treatment liquid.
3. The wastewater treatment method according to claim 2, wherein the operating temperature of the primary nitrification tank and the secondary nitrification tank is 32-35 ℃.
4. The wastewater treatment method according to claim 1, wherein in S4, the flocculating agent is polyaluminum chloride and acrylamide homopolymer.
5. The wastewater treatment method according to claim 1, wherein in the step S4, the two-stage treatment solution is subjected to primary sludge-water separation in the secondary sedimentation tank, and the time for performing the primary sludge-water separation is 3-5 h.
6. The wastewater treatment method according to claim 1, wherein in S1, the blended wastewater mixed solution is further stirred in an anaerobic water distribution tank;
in the step S2, the wastewater mixed liquid treated by the anaerobic distribution tank is further stirred in an anaerobic reaction tower, the retention time of the wastewater mixed liquid treated by the anaerobic distribution tank in the anaerobic reaction tower is 6-7 days, and the operating temperature in the anaerobic reaction tower is 35-38 ℃.
7. The wastewater treatment method according to claim 1, wherein in S1, the collected production wastewater is poured into a wastewater collection tank, and aeration is added in the wastewater collection tank to further homogenize the wastewater blending liquid.
8. A wastewater treatment system, comprising:
the outlet end of the wastewater collecting tank is connected with the inlet end of the anaerobic distribution tank through a wastewater lifting pump;
the anaerobic reaction tower, the entrance of the said anaerobic reaction tower is connected with exit end of the anaerobic distribution pool, the exit of the said anaerobic reaction tower is connected to the entrance of the first-class denitrification pool, the exit of the first-class denitrification pool is connected with entrance of the first-class nitrification pool, the exit of the first-class nitrification pool is connected with entrance of the second-class denitrification pool, the exit of the second-class denitrification pool is connected with entrance of the second-class nitrification pool;
the outlet of the secondary nitrification tank is connected with the inlet of the secondary sedimentation tank, the outlet of the secondary sedimentation tank is connected with the inlet of the materialization reaction tank, the outlet of the materialization reaction tank is connected with the inlet of the materialization sedimentation tank, and the outlet of the materialization sedimentation tank is connected with the inlet of the clean water tank.
9. The wastewater treatment system according to claim 8, further comprising a sludge tank, wherein the secondary sedimentation tank and the materialized sedimentation tank are both communicated with the sludge tank through a sludge pump.
10. The wastewater treatment system of claim 9, wherein a three-phase separator is provided at the top of the anaerobic reaction column.
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