CN110590064A - Coking wastewater treatment method and system - Google Patents
Coking wastewater treatment method and system Download PDFInfo
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- CN110590064A CN110590064A CN201910887752.7A CN201910887752A CN110590064A CN 110590064 A CN110590064 A CN 110590064A CN 201910887752 A CN201910887752 A CN 201910887752A CN 110590064 A CN110590064 A CN 110590064A
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- 238000004939 coking Methods 0.000 title claims abstract description 42
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 11
- 239000002351 wastewater Substances 0.000 claims abstract description 80
- 238000006243 chemical reaction Methods 0.000 claims abstract description 51
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005189 flocculation Methods 0.000 claims abstract description 14
- 230000016615 flocculation Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000006864 oxidative decomposition reaction Methods 0.000 claims abstract description 9
- 238000004062 sedimentation Methods 0.000 claims description 33
- 239000010802 sludge Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 17
- 230000001546 nitrifying effect Effects 0.000 claims description 11
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 10
- 239000011790 ferrous sulphate Substances 0.000 claims description 10
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 10
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 10
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- 206010021143 Hypoxia Diseases 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 5
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 239000000701 coagulant Substances 0.000 claims description 4
- 239000008394 flocculating agent Substances 0.000 claims description 4
- 244000005700 microbiome Species 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 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 description 2
- 238000005273 aeration Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
-
- 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
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a method and a system for treating coking wastewater, belonging to the technical field of wastewater treatment. In particular to a method for treating coking wastewater, which comprises the following steps: a pretreatment step, carrying out oil-water separation on the wastewater, and carrying out oxidative decomposition on the separated wastewater; a biochemical treatment step, wherein the wastewater after the pretreatment step is finished is subjected to biological decomposition, and the biological decomposition is repeated twice; and a deep treatment step, wherein the wastewater after the biochemical treatment step is subjected to flocculation reaction, and the wastewater after the flocculation reaction is subjected to Fenton reaction. The treatment method of the coking wastewater comprises a pretreatment system, a biochemical treatment system and an advanced treatment system which are sequentially communicated; the invention reduces the concentration of refractory organic matters or changes the molecular structure of the refractory organic matters in front of a biochemical treatment system, improves the biodegradability of coking wastewater and ensures the effluent quality after wastewater treatment.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and relates to a method and a system for treating coking wastewater.
Background
The coking wastewater is coal high-temperature dry distillationThe industrial organic wastewater generated in the gas purification, byproduct recovery and refining processes has extremely complex chemical components and contains petroleum, volatile phenol, ammonia nitrogen, sulfide, cyanide, thiocyanide, polycyclic aromatic hydrocarbon, heterocyclic compounds and the like. High-concentration ammonia nitrogen substances contained in the coking wastewater and trace high-toxicity CN-、SCN-Tar, naphthalene and the like, which have the inhibiting effect on microorganisms, belong to typical organic wastewater which is difficult to biodegrade.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for treating coking wastewater, which reduce the concentration of refractory organics or change the molecular structure of the refractory organics before a biochemical treatment system, improve the biodegradability of the coking wastewater, and ensure the quality of the effluent after wastewater treatment.
In order to achieve the purpose, the invention provides the following technical scheme:
a coking wastewater treatment method provides a pretreatment system, a biochemical treatment system and an advanced treatment system, and comprises the following steps: a pretreatment step, carrying out oil-water separation on the wastewater, carrying out oxidative decomposition reaction on the separated wastewater, and feeding the reacted wastewater into a regulating reservoir; a biochemical treatment step, wherein the wastewater after the pretreatment step is finished is subjected to biological decomposition, and the biological decomposition is repeated for a plurality of times; and a deep treatment step, wherein the wastewater after the biochemical treatment step is subjected to flocculation reaction, the wastewater after the flocculation reaction is subjected to Fenton reaction, and the wastewater after the Fenton reaction is subjected to precipitation separation.
Alternatively, in the "pretreatment step", when the oxidative decomposition reaction is performed, ferrous sulfate and persulfate are added to the wastewater.
Optionally, the adding amount of the ferrous sulfate is 500-1000 mg/L, the adding amount of the persulfate is 200-500 mg/L, and the time reaction of the oxidative decomposition reaction is 30-60 min.
Optionally, in the "biochemical treatment step", the biological decomposition includes anoxic biological decomposition, aerobic biological decomposition and precipitation separation, the wastewater after the anoxic biological decomposition is subjected to aerobic biological decomposition, and the wastewater after the aerobic biological decomposition is subjected to precipitation separation.
Optionally, nitrifying liquid generated by aerobic biological decomposition and sludge generated by precipitation separation both flow back and participate in anoxic biological decomposition of the wastewater, wherein the reflux ratio of the nitrifying liquid is 200-300%, and the reflux ratio of the sludge is 80-100%.
Optionally, in the "advanced treatment step", a flocculating agent and a coagulant aid are added to the wastewater during the flocculation reaction, and sulfuric acid, ferrous sulfate and hydrogen peroxide are added to the wastewater during the Fenton reaction.
Optionally, the flocculating agent and the coagulant aid are polymeric ferric sulfate and polyacrylamide respectively, the dosage of the polymeric ferric sulfate is 100-500 mg/L, and the dosage of the polyacrylamide is 5-50 mg/L.
A treatment system for coking wastewater comprises a pretreatment system, a biochemical treatment system and an advanced treatment system which are sequentially communicated; the pretreatment system is internally provided with an oil separation tank, a reaction tank and an adjusting tank, wherein the oil separation tank, the reaction tank and the adjusting tank are sequentially communicated; the biochemical treatment system comprises a primary biological reaction system and a secondary biological reaction system which are sequentially communicated, the system in the primary biological reaction system comprises a primary anoxic tank, a primary aerobic tank and a primary sedimentation tank which are sequentially communicated, and the system in the secondary biological reaction system comprises a secondary anoxic tank, a secondary aerobic tank and a secondary sedimentation tank which are sequentially communicated; the advanced treatment system comprises a flocculation reaction sedimentation tank, a Fenton reaction tank and a three-sedimentation tank which are sequentially communicated.
Optionally, the pretreatment system further comprises an accident tank for receiving waste water in an accident, and the accident tank is communicated with the oil separation tank.
Optionally, the one-level oxygen deficiency pond with be provided with the one-level between the one-level good oxygen pond and nitrify the liquid return line, the second grade oxygen deficiency pond with be provided with the second grade between the second grade good oxygen pond and nitrify the liquid return line, the first pond that sinks with still be provided with the one-level mud return line between the one-level oxygen deficiency pond, the second sink the pond with still be provided with the second grade mud return line between the second grade oxygen deficiency pond.
Optionally, the system further comprises a clean water tank for storing effluent after treatment, and the clean water tank is communicated with the three-sedimentation tank.
Optionally, a hyperboloid vertical stirrer is arranged in each of the primary anoxic tank and the secondary anoxic tank.
The invention has the beneficial effects that:
after the coking wastewater is pretreated, highly toxic substances and refractory organic matters in the coking wastewater can be reduced, the toxicity of the coking wastewater can be reduced, the impact load of the coking wastewater on a biochemical treatment system is effectively reduced, the biodegradability of the coking wastewater is improved, the decomposition of microorganisms is facilitated, the decomposition efficiency of the microorganisms is improved, and the treatment effect of the coking wastewater is improved; the biological decomposition is repeated for a plurality of times, so that the total nitrogen content of the coking wastewater after treatment can be effectively reduced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a system for treating coking wastewater.
Reference numerals: the system comprises a pretreatment system 1, a biochemical treatment system 2, an advanced treatment system 3, an accident tank 4, an oil separation tank 5, a reaction tank 6, a regulating tank 7, a primary anoxic tank 8, a primary aerobic tank 9, a primary sedimentation tank 10, a secondary anoxic tank 11, a secondary aerobic tank 12, a secondary sedimentation tank 13, a flocculation reaction sedimentation tank 14, a Fenton reaction tank 15, a tertiary sedimentation tank 16, a clean water tank 17, a primary sludge return pipeline 18, a primary nitrifying liquid return pipeline 19, a secondary sludge return pipeline 20 and a secondary nitrifying liquid return pipeline 21.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a coking wastewater treatment system includes a pretreatment system 1, a biochemical treatment system 2 and an advanced treatment system 3 sequentially connected in sequence; the pretreatment system 1 is internally provided with an oil separation tank 5, a reaction tank 6 and an adjusting tank 7, wherein the oil separation tank 5, the reaction tank 6 and the adjusting tank 7 are sequentially communicated; the biochemical treatment system 2 comprises a primary biological reaction system and a secondary biological reaction system which are sequentially communicated, the system in the primary biological reaction system comprises a primary anoxic tank 8, a primary aerobic tank 9 and a primary sedimentation tank 10 which are sequentially communicated, and the system in the secondary biological reaction system comprises a secondary anoxic tank 11, a secondary aerobic tank 12 and a secondary sedimentation tank 13 which are sequentially communicated; the advanced treatment system 3 comprises a flocculation reaction sedimentation tank 14, a Fenton reaction tank 15 and a tertiary sedimentation tank 16 which are sequentially communicated.
In this embodiment, the pretreatment system 1 further includes an accident tank 4 for receiving wastewater during an accident, and the accident tank 4 is communicated with the oil separation tank 5. A first-stage nitrifying liquid return pipeline 19 is arranged between the first-stage anoxic tank 8 and the first-stage aerobic tank 9, a second-stage nitrifying liquid return pipeline 21 is arranged between the second-stage anoxic tank 11 and the second-stage aerobic tank 12, a first-stage sludge return pipeline 18 is also arranged between the first-stage sedimentation tank 10 and the first-stage anoxic tank 8, and a second-stage sludge return pipeline 20 is also arranged between the second-stage sedimentation tank 13 and the second-stage anoxic tank 11. And the system also comprises a clean water tank for storing the clean water after treatment, and the clean water tank is communicated with the three-sedimentation tank 16.
During normal practical use, coking wastewater enters the oil separation tank 5 to be subjected to oil-water separation, petroleum and part of suspended matters in the coking wastewater are removed, then the coking wastewater enters the reaction tank 6 to be subjected to oxidative decomposition reaction, ferrous sulfate and persulfate are added into the reaction tank 6 in the oxidative decomposition reaction, the reaction time is 30-60min, the adding amounts of the ferrous sulfate and the persulfate are 500-1000 mg/L and 200-500 mg/L respectively, and the persulfate is subjected to Fe treatment2+The activated sulfate radicals generate strong oxidizing sulfate radicals, and the sulfate radicals are used for rapidly oxidizing and decomposing highly toxic substances and refractory organic matters in the coking wastewater to reduce the toxicity to the biochemical treatment system 2, and then enter the regulating tank 7, and the regulating tank 7 plays a role in regulating water quantity and controlling load.
Preferably, the water inlet of the oil separation tank 5 adopts a mode of entering from bottom to top and exiting from bottom to top, and is used for removing petroleum and suspended matters; the reaction tank 6 adopts a mechanical stirring tank; the reaction time is preferably 30-60min, the adding amount of the ferrous sulfate and the persulfate is preferably 500-1000 mg/L and 200-500 mg/L respectively, the persulfate is preferably one or two of sodium persulfate and potassium persulfate, and further the persulfate is preferably sodium persulfate. Coking wastewater passing through the pretreatment system 1 firstly enters a primary anoxic tank 8, the primary anoxic tank 8 respectively receives nitrifying liquid and sludge which flow back from a primary aerobic tank 9 and a primary sedimentation tank 10, and then the coking wastewater passes through the primary aerobic tank 9 and the primary sedimentation tank 10 in sequence for biological decomposition.
Preferably, the hydraulic retention time in the first-stage anoxic tank 8 is 37.5h, the denitrification function is realized under the anoxic condition, and part of organic matters can be degraded; because the coking wastewater is lack of phosphorus element, KH is added into the tank2PO4Supplementing phosphorus element required by microorganism.
Preferably, a hyperboloid vertical stirrer is further arranged in the primary anoxic tank 8, so that the wastewater and the sludge are uniformly distributed in the tank, and the sludge deposition phenomenon is prevented; the first-stage aerobic tank 9 preferably adopts a lifting type aeration mode to convert ammonia nitrogen in the coking wastewater into nitrate nitrogen, the hydraulic retention time is 110 hours, the nitrified liquid flows back to the first-stage anoxic tank 8 through a first-stage nitrified liquid return pipeline 19, the reflux ratio is 200-300%, and organic matters in the wastewater are removed; the primary sedimentation tank 10 preferably adopts a radial flow sedimentation tank, the effluent of the primary aerobic tank 9 is subjected to mud-water separation, part of sludge flows back to the primary anoxic tank 8 through a primary sludge return pipeline 18, and the reflux ratio is 80-100%.
The wastewater flowing out of the primary sedimentation tank 10 flows into a secondary anoxic tank 11, the secondary anoxic tank 11 simultaneously receives nitrifying liquid and sludge which flow back from a secondary aerobic tank 12 and a secondary sedimentation tank 13 respectively, and then the nitrifying liquid and the sludge pass through the secondary aerobic tank 12 and the secondary sedimentation tank 13 in sequence to be subjected to biological decomposition again.
Preferably, the hydraulic retention time in the secondary anoxic pond 11 is 25h, and total nitrogen and organic matters are further removed. Preferably, glucose is added into the second-stage anoxic tank 11 to supplement organic matters required by microorganisms, and a hyperboloid vertical stirrer is arranged to uniformly distribute the wastewater and the sludge in the tank so as to prevent the sludge deposition. The second-stage aerobic tank 12 preferably adopts a lifting type aeration mode, ammonia nitrogen in the coking wastewater is further converted into nitrate nitrogen, the hydraulic retention time in the second-stage aerobic tank 12 is preferably 25 hours, the nitrified liquid flows back to the second-stage anoxic tank 11 through a second-stage nitrified liquid return pipeline 21, the reflux ratio is 200-300%, and organic matters in the wastewater are removed simultaneously.
Preferably, NaHCO is added to maintain alkalinity in the pond3. The secondary sedimentation tank 13 preferably adopts a radial flow sedimentation tank, aAnd (3) carrying out mud-water separation on the effluent of the secondary aerobic tank 12, and refluxing partial sludge to the secondary anoxic tank 11 through a secondary sludge reflux pipeline 20 at a reflux ratio of 80-100%.
The wastewater treated by the biochemical system firstly enters a flocculation reaction sedimentation tank 14, polymeric ferric sulfate and polyacrylamide are added into the flocculation reaction sedimentation tank 14, the reaction time is 15min, and macromolecular refractory organic matters are removed; then the wastewater enters a Fenton reaction tank 15, and sulfuric acid, ferrous sulfate and hydrogen peroxide are added into the Fenton reaction tank 15 to form refractory organic matters in the hydroxyl radical oxidation wastewater. And the wastewater flowing out of the Fenton reaction tank 15 enters a three-precipitation tank 16 for precipitation and separation. The effluent of the three-sedimentation tank 16 flows into a clean water tank 17, and the clean water tank 17 stores the effluent of the three-sedimentation tank 16 and can be recycled as defoaming water, slag flushing water and the like.
In this embodiment, the main pollutant treatment results in each stage are as follows:
in case of accident, the coking wastewater firstly enters the accident tank 4 and then enters the oil separation tank 5 for treatment as described above.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A coking wastewater treatment method is characterized in that a pretreatment system, a biochemical treatment system and a deep treatment system are provided, and the method comprises the following steps:
a pretreatment step, carrying out oil-water separation on the wastewater, carrying out oxidative decomposition reaction on the separated wastewater, and feeding the reacted wastewater into a regulating reservoir;
a biochemical treatment step, wherein the wastewater after the pretreatment step is finished is subjected to biological decomposition, and the biological decomposition is repeated for a plurality of times;
and a deep treatment step, wherein the wastewater after the biochemical treatment step is subjected to flocculation reaction, the wastewater after the flocculation reaction is subjected to Fenton reaction, and the wastewater after the Fenton reaction is subjected to precipitation separation.
2. The method for treating the coking wastewater according to claim 1, characterized in that: in the pretreatment step, ferrous sulfate and persulfate are added into the wastewater during the oxidative decomposition reaction.
3. The method for treating the coking wastewater according to claim 2, characterized in that: the adding amount of the ferrous sulfate is 500-1000 mg/L, the adding amount of the persulfate is 200-500 mg/L, and the time of the oxidative decomposition reaction is 30-60 min.
4. The method for treating the coking wastewater according to claim 1, characterized in that: in the biochemical treatment step, the biological decomposition comprises anoxic biological decomposition, aerobic biological decomposition and precipitation separation, the wastewater after the anoxic biological decomposition is subjected to aerobic biological decomposition, and the wastewater after the aerobic biological decomposition is subjected to precipitation separation.
5. The method for treating the coking wastewater according to claim 4, characterized in that: nitrifying liquid generated by aerobic biological decomposition and sludge generated by precipitation separation both flow back and participate in anoxic biological decomposition of the wastewater, wherein the reflux ratio of the nitrifying liquid is 200-300%, and the reflux ratio of the sludge is 80-100%.
6. The method for treating the coking wastewater according to claim 1, characterized in that: in the advanced treatment step, a flocculating agent and a coagulant aid are added into the wastewater during the flocculation reaction, and sulfuric acid, ferrous sulfate and hydrogen peroxide are added into the wastewater during the Fenton reaction.
7. The method for treating the coking wastewater according to claim 6, characterized in that: the flocculating agent and the coagulant aid are polymeric ferric sulfate and polyacrylamide respectively, the dosage of the polymeric ferric sulfate is 100-500 mg/L, and the dosage of the polyacrylamide is 5-50 mg/L.
8. A treatment system of coking wastewater is characterized in that: comprises a pretreatment system, a biochemical treatment system and an advanced treatment system which are sequentially communicated;
the pretreatment system is internally provided with an oil separation tank, a reaction tank and an adjusting tank, wherein the oil separation tank, the reaction tank and the adjusting tank are sequentially communicated;
the biochemical treatment system comprises a primary biological reaction system and a secondary biological reaction system which are sequentially communicated, the system in the primary biological reaction system comprises a primary anoxic tank, a primary aerobic tank and a primary sedimentation tank which are sequentially communicated, and the system in the secondary biological reaction system comprises a secondary anoxic tank, a secondary aerobic tank and a secondary sedimentation tank which are sequentially communicated;
the advanced treatment system comprises a flocculation reaction sedimentation tank, a Fenton reaction tank and a three-sedimentation tank which are sequentially communicated.
9. The coking wastewater treatment system according to claim 8, characterized in that: the pretreatment system further comprises an accident pool for receiving waste water during accidents, and the accident pool is communicated with the oil separation pool.
10. The coking wastewater treatment system according to claim 8, characterized in that: the one-level oxygen deficiency pond reaches all be equipped with hyperboloid vertical mixer in the second grade oxygen deficiency pond.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111960623A (en) * | 2020-09-22 | 2020-11-20 | 中冶赛迪工程技术股份有限公司 | Coking wastewater treatment system and method capable of achieving lifting aeration |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120205317A1 (en) * | 2010-02-11 | 2012-08-16 | Hongqiang Ren | Method of treatment of coke wastewater |
| CN102849893A (en) * | 2012-08-06 | 2013-01-02 | 南京凯盛国际工程有限公司 | Treatment method of high-concentration nondegradable organic wastewater |
| CN105461166A (en) * | 2015-11-26 | 2016-04-06 | 湖南万净环保科技有限公司 | Enhanced biological treatment and reusing device and method for high-concentration refractory organic industrial wastewater |
| CN205893015U (en) * | 2016-08-09 | 2017-01-18 | 江苏华神环保工程有限公司 | Coking wastewater complete set processing system |
| CN106587535A (en) * | 2016-12-30 | 2017-04-26 | 中冶赛迪工程技术股份有限公司 | Coking wastewater treatment process and system |
| US20180009678A1 (en) * | 2016-07-07 | 2018-01-11 | Terra-Hydrochem, Inc. | Method for recycling oilfield and other wastewater |
| CN109020090A (en) * | 2018-09-12 | 2018-12-18 | 南京科莱恩环境工程有限公司 | A kind of high concentration hard-degraded organic waste water processing unit and method |
| CN109179915A (en) * | 2018-11-09 | 2019-01-11 | 鞍钢股份有限公司 | Method for strengthening biochemical treatment of coking wastewater |
| CN109824220A (en) * | 2019-04-04 | 2019-05-31 | 湖南湘奈环保科技有限责任公司 | A kind of Biochemical Process for Treating Coke Plant Wastewater |
| CN210764880U (en) * | 2019-09-19 | 2020-06-16 | 中冶赛迪工程技术股份有限公司 | Coking wastewater treatment system |
-
2019
- 2019-09-19 CN CN201910887752.7A patent/CN110590064A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120205317A1 (en) * | 2010-02-11 | 2012-08-16 | Hongqiang Ren | Method of treatment of coke wastewater |
| CN102849893A (en) * | 2012-08-06 | 2013-01-02 | 南京凯盛国际工程有限公司 | Treatment method of high-concentration nondegradable organic wastewater |
| CN105461166A (en) * | 2015-11-26 | 2016-04-06 | 湖南万净环保科技有限公司 | Enhanced biological treatment and reusing device and method for high-concentration refractory organic industrial wastewater |
| US20180009678A1 (en) * | 2016-07-07 | 2018-01-11 | Terra-Hydrochem, Inc. | Method for recycling oilfield and other wastewater |
| CN205893015U (en) * | 2016-08-09 | 2017-01-18 | 江苏华神环保工程有限公司 | Coking wastewater complete set processing system |
| CN106587535A (en) * | 2016-12-30 | 2017-04-26 | 中冶赛迪工程技术股份有限公司 | Coking wastewater treatment process and system |
| CN109020090A (en) * | 2018-09-12 | 2018-12-18 | 南京科莱恩环境工程有限公司 | A kind of high concentration hard-degraded organic waste water processing unit and method |
| CN109179915A (en) * | 2018-11-09 | 2019-01-11 | 鞍钢股份有限公司 | Method for strengthening biochemical treatment of coking wastewater |
| CN109824220A (en) * | 2019-04-04 | 2019-05-31 | 湖南湘奈环保科技有限责任公司 | A kind of Biochemical Process for Treating Coke Plant Wastewater |
| CN210764880U (en) * | 2019-09-19 | 2020-06-16 | 中冶赛迪工程技术股份有限公司 | Coking wastewater treatment system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111960623A (en) * | 2020-09-22 | 2020-11-20 | 中冶赛迪工程技术股份有限公司 | Coking wastewater treatment system and method capable of achieving lifting aeration |
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