CN110776218A - Coking plant wastewater treatment process - Google Patents
Coking plant wastewater treatment process Download PDFInfo
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- CN110776218A CN110776218A CN201911248546.8A CN201911248546A CN110776218A CN 110776218 A CN110776218 A CN 110776218A CN 201911248546 A CN201911248546 A CN 201911248546A CN 110776218 A CN110776218 A CN 110776218A
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- treatment
- wastewater
- sludge
- tank
- aerobic
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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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
- C02F1/5236—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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
Abstract
The invention discloses a wastewater treatment process of a coking plant, which relates to the technical field of wastewater treatment of the coking plant, in particular to a wastewater treatment process of the coking plant, wherein a soda solution is required to be added in an aerobic section to provide alkalinity required by nitration reaction, ammonia nitrogen can be basically and completely converted into nitrate nitrogen, and meanwhile, organic matters are further degraded, so that the COD of final effluent reaches the standard; according to the invention, after aerobic treatment, part of wastewater flows back to the anoxic tank to provide nitrate nitrogen for the anoxic section; according to the invention, polyaluminium chloride or polyaluminium ferric chloride is added into the coagulation part to increase the precipitation performance of the sludge in the precipitation part and further reduce the COD of the effluent; according to the invention, cationic polyacrylamide is added into the concentration tank to perform flocculation reaction with sludge, so that the sludge dewatering efficiency is improved.
Description
Technical Field
The invention relates to the technical field of wastewater treatment of a coking plant, in particular to a wastewater treatment process of the coking plant.
Background
Coking wastewater treatment (treatment of coking wastewater) is the last step in the purification of coke oven gas. The coking wastewater contains a large amount of harmful substances which are harmful to human bodies and pollute the environment. Phenol can cause acute or chronic poisoning, stimulate respiratory center, induce nervous system disorder, and damage liver and kidney functions. The water containing more than 10mg/L of phenol can cause massive death of fish. Cyanide can cause central nervous poisoning, leading to paralysis and asphyxia. Ammonia and sulfides are also toxic to humans.
However, the existing coking sewage treatment process is complex, the COD of the effluent water does not reach the standard due to the insufficient denitrification carbon source contained in the coking wastewater, and the sludge dewatering efficiency is low.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a wastewater treatment process of a coking plant, which solves the problems that the existing coking wastewater treatment process is complex, the COD of the effluent cannot reach the standard due to the insufficient denitrification carbon source contained in the coking wastewater, and the sludge dehydration efficiency is low.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a process for treating wastewater of a coking plant comprises the following steps:
step 1: wastewater regulation, namely uniformly feeding the production wastewater and domestic sewage from each workshop into a regulating tank;
step 2: anaerobic acidification treatment, namely carrying out anaerobic acidification on the wastewater, wherein phenol, xylenol, quinoline, isoquinoline, indole, pyridine and other heterocyclic compounds in the wastewater are greatly converted or removed;
and step 3: performing denitrification treatment;
and 4, step 4: aerobic treatment;
and 5: coagulating and precipitating;
step 6: and (5) concentrating.
The step 3: the denitrification treatment is a key step in the anoxic treatment, the denitrification treatment is carried out in an anoxic tank, methanol is added into the anoxic tank as a supplementary carbon source due to the shortage of a denitrification carbon source contained in the coking wastewater, and nitrate nitrogen is converted into nitrogen through the denitrification treatment, so that the aim of denitrification is fulfilled.
The step 4: and (3) aerobic treatment, wherein ammonia nitrogen contained in the wastewater is high and COD is low, so that soda solution is required to be added in an aerobic section to provide alkalinity required by nitration reaction, the ammonia nitrogen can be basically and completely converted into nitrate nitrogen, and meanwhile, organic matters are further degraded, so that the final effluent COD reaches the standard.
The step 4: after aerobic treatment, part of the wastewater flows back to the anoxic tank to provide nitrate nitrogen for the anoxic section.
The step 5: coagulating sedimentation, namely adding polyaluminium chloride or polyaluminium ferric chloride into a coagulating part to increase the sedimentation performance of sludge in the sedimentation part and further reduce the COD of the effluent.
The step 6: and (5) concentration treatment, namely further concentration treatment in the step (5), and adding cationic polyacrylamide into the concentration tank to perform flocculation reaction with the sludge, so that the sludge dewatering efficiency is improved.
The step 6: and (4) concentrating, wherein supernatant in the concentrating tank flows back to the regulating tank for treatment again, sludge in the concentrating tank is discharged into the sludge storage tank, and the sludge dewatering machine is used for dewatering at regular time.
(III) advantageous effects
The invention provides a wastewater treatment process of a coking plant. The method has the following beneficial effects:
1. according to the invention, soda solution is required to be added in the aerobic section to provide alkalinity required by nitration reaction, ammonia nitrogen can be basically and completely converted into nitrate nitrogen, and meanwhile, organic matters are further degraded, so that the COD of the final effluent reaches the standard;
2. according to the invention, after aerobic treatment, part of wastewater flows back to the anoxic tank to provide nitrate nitrogen for the anoxic section;
3. according to the invention, polyaluminium chloride or polyaluminium ferric chloride is added into the coagulation part to increase the precipitation performance of the sludge in the precipitation part and further reduce the COD of the effluent;
4. according to the invention, cationic polyacrylamide is added into the concentration tank to perform flocculation reaction with sludge, so that the sludge dewatering efficiency is improved.
Drawings
FIG. 1 is a flow chart of wastewater treatment according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a process for treating wastewater of a coking plant comprises the following steps:
step 1: wastewater regulation, namely uniformly feeding the production wastewater and domestic sewage from each workshop into a regulating tank;
step 2: anaerobic acidification treatment, namely carrying out anaerobic acidification on the wastewater, wherein phenol, xylenol, quinoline, isoquinoline, indole, pyridine and other heterocyclic compounds in the wastewater are greatly converted or removed;
and step 3: performing denitrification treatment;
and 4, step 4: aerobic treatment;
and 5: coagulating and precipitating;
step 6: and (5) concentrating.
The step 3: the denitrification treatment is a key step in the anoxic treatment, the denitrification treatment is carried out in an anoxic tank, methanol is added into the anoxic tank as a supplementary carbon source due to the shortage of a denitrification carbon source contained in the coking wastewater, and nitrate nitrogen is converted into nitrogen through the denitrification treatment, so that the aim of denitrification is fulfilled.
The step 4: and (3) aerobic treatment, wherein ammonia nitrogen contained in the wastewater is high and COD is low, so that soda solution is required to be added in an aerobic section to provide alkalinity required by nitration reaction, the ammonia nitrogen can be basically and completely converted into nitrate nitrogen, and meanwhile, organic matters are further degraded, so that the final effluent COD reaches the standard.
The step 4: after aerobic treatment, part of the wastewater flows back to the anoxic tank to provide nitrate nitrogen for the anoxic section.
The step 5: coagulating sedimentation, namely adding polyaluminium chloride or polyaluminium ferric chloride into a coagulating part to increase the sedimentation performance of sludge in the sedimentation part and further reduce the COD of the effluent.
The step 6: and (5) concentration treatment, namely further concentration treatment in the step (5), and adding cationic polyacrylamide into the concentration tank to perform flocculation reaction with the sludge, so that the sludge dewatering efficiency is improved.
The step 6: and (4) concentrating, wherein supernatant in the concentrating tank flows back to the regulating tank for treatment again, sludge in the concentrating tank is discharged into the sludge storage tank, and the sludge dewatering machine is used for dewatering at regular time.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A process for treating wastewater of a coking plant is characterized by comprising the following steps: the wastewater treatment process of the coking plant comprises the following steps:
step 1: wastewater regulation, namely uniformly feeding the production wastewater and domestic sewage from each workshop into a regulating tank;
step 2: anaerobic acidification treatment, namely carrying out anaerobic acidification on the wastewater, wherein phenol, xylenol, quinoline, isoquinoline, indole, pyridine and other heterocyclic compounds in the wastewater are greatly converted or removed;
and step 3: performing denitrification treatment;
and 4, step 4: aerobic treatment;
and 5: coagulating and precipitating;
step 6: and (5) concentrating.
2. A process according to claim 1 for the treatment of wastewater from a coke-oven plant, characterized in that: the step 3: and (4) denitrification treatment, wherein during denitrification treatment, methanol is added into the anoxic tank.
3. A process according to claim 1 for the treatment of wastewater from a coke-oven plant, characterized in that: the step 4: and (4) aerobic treatment, wherein in the aerobic treatment process, a soda solution is added into the aerobic tank.
4. A process according to claim 1 for the treatment of wastewater from a coke-oven plant, characterized in that: the step 4: after aerobic treatment, part of the wastewater flows back to the anoxic tank.
5. A process according to claim 1 for the treatment of wastewater from a coke-oven plant, characterized in that: the step 5: coagulating sedimentation, namely adding polyaluminium chloride or polyaluminium ferric chloride into a coagulating part to increase the sedimentation performance of sludge in the sedimentation part and further reduce the COD of the effluent.
6. A process according to claim 1 for the treatment of wastewater from a coke-oven plant, characterized in that: the step 6: and (5) concentration treatment, further concentrating the sludge in the step (5), and adding cationic polyacrylamide into the concentration tank to perform flocculation reaction with the sludge.
7. A process according to claim 1 for the treatment of wastewater from a coke-oven plant, characterized in that: the step 6: and (4) concentrating, wherein supernatant in the concentrating tank flows back to the regulating tank for treatment again, sludge in the concentrating tank is discharged into the sludge storage tank, and the sludge dewatering machine is used for dewatering at regular time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911248546.8A CN110776218A (en) | 2019-12-07 | 2019-12-07 | Coking plant wastewater treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911248546.8A CN110776218A (en) | 2019-12-07 | 2019-12-07 | Coking plant wastewater treatment process |
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| CN110776218A true CN110776218A (en) | 2020-02-11 |
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| CN201911248546.8A Pending CN110776218A (en) | 2019-12-07 | 2019-12-07 | Coking plant wastewater treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521029A (en) * | 2022-09-30 | 2022-12-27 | 河北龚泉环保科技有限公司 | Treatment device for high-concentration ammonia nitrogen in coking wastewater |
Citations (4)
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|---|---|---|---|---|
| CN205893017U (en) * | 2016-08-09 | 2017-01-18 | 江苏华神环保工程有限公司 | Coking wastewater biological processing device |
| 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 |
| CN107200429A (en) * | 2016-03-18 | 2017-09-26 | 上海宝钢化工有限公司 | Coking chemical waste water mixed liquor nitrogen rejection facility and the method for lifting Denitrification of Coking Wastewater ability |
| CN207362005U (en) * | 2017-09-14 | 2018-05-15 | 云南天朗环境科技有限公司 | A kind of Zero-discharge coked wastewater treatment system |
-
2019
- 2019-12-07 CN CN201911248546.8A patent/CN110776218A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107200429A (en) * | 2016-03-18 | 2017-09-26 | 上海宝钢化工有限公司 | Coking chemical waste water mixed liquor nitrogen rejection facility and the method for lifting Denitrification of Coking Wastewater ability |
| CN205893017U (en) * | 2016-08-09 | 2017-01-18 | 江苏华神环保工程有限公司 | Coking wastewater biological processing device |
| 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 |
| CN207362005U (en) * | 2017-09-14 | 2018-05-15 | 云南天朗环境科技有限公司 | A kind of Zero-discharge coked wastewater treatment system |
Non-Patent Citations (3)
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| 丁菲;: "A-A-O法在焦化废水处理中的运行及影响因素", 广东化工, no. 03, pages 3 * |
| 王婷;钱天伟;刘宏芳;李一菲;: "A~2/O法处理焦化废水的工程应用", 科技情报开发与经济, no. 30 * |
| 王纪军;: "A~2/O工艺处理焦化废水工程实例", 中国环保产业, no. 03, pages 1 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521029A (en) * | 2022-09-30 | 2022-12-27 | 河北龚泉环保科技有限公司 | Treatment device for high-concentration ammonia nitrogen in coking wastewater |
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