CN111892210A - Semi-coke wastewater pretreatment method and device - Google Patents
Semi-coke wastewater pretreatment method and device Download PDFInfo
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- CN111892210A CN111892210A CN202010913955.1A CN202010913955A CN111892210A CN 111892210 A CN111892210 A CN 111892210A CN 202010913955 A CN202010913955 A CN 202010913955A CN 111892210 A CN111892210 A CN 111892210A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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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
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2101/10—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
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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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
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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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
Abstract
The invention discloses a semi-coke wastewater pretreatment method and a device, wherein the method and the device comprise primary oil removal, deep oil removal and tail gas absorption treatment; the preliminary oil removal comprises gravity settling, pre-filtering, demulsification and coalescence; the deep oil removal comprises the following steps: aeration deamination, dosing and mixing, standing, flat ceramic membrane and concentration and filtration; the tail gas absorption treatment comprises the following steps: the first absorption device and the second absorption device. According to the invention, through reasonable and optimized configuration of each process, the floating oil, the dispersed oil, the emulsified oil and the dust in the sewage raw water are greatly reduced, a certain removing effect on the dissolved oil is achieved, the oil-dust content of the inlet water of the phenol-ammonia recovery device is finally greatly reduced, and the operation period of the phenol-ammonia recovery device can be effectively prolonged.
Description
The invention belongs to the field of sewage treatment, and particularly relates to a semi-coke wastewater pretreatment method and device.
Background
Semi coke can replace coke (metallurgical coke) and can be widely used in the industries of chemical industry, smelting, gas making and the like, and is superior to coke in the process of producing high-energy-consumption products such as metal silicon, ferroalloy, ferrosilicon, silicomanganese, chemical fertilizer, calcium carbide and the like. Due to the problems of raw materials and process in the production of semi-coke, the waste water components are complex, the content of phenol and ammonia is high, and the prior phenol and ammonia recovery process which uses deacidification deamination and MIBK as an extracting agent is more used. In the actual production process, the pretreatment process can not effectively reduce the oil and dust content, so that the deacidification and deamination tower and the extraction tower are seriously blocked.
The oil in the semi-coke wastewater mainly comprises oil slick, heavy oil, dispersed oil, emulsified oil, dissolved oil and oil dust combination, the common pretreatment adopts a method of combining gravity settling, tank-in-tank and filtering, the oil slick, the heavy oil, the dispersed oil, partial emulsified oil and the oil dust combination have certain removal effect, but the oil removal and dust removal effect cannot meet the requirement of high-load long-period operation of a phenol-ammonia recovery device.
Patent CN104926021B discloses phenol ammonia effluent treatment plant, and high concentration phenol ammonia effluent from coal industry gets into gravity oil interceptor separation heavy oil, gets into the jar through promoting and gets rid of oil slick, heavy oil and partial mud in the one-level jar, and the straight-flow advances ceramic filter and sends into ammonia still behind the fine greasy dirt granule, the suspended solid of further getting rid of the waste water dispersion. In the method, most of floating oil, heavy oil and part of oil-dust combination are removed by the gravity oil separation and the tank-in-tank, emulsified oil and dissolved oil are not well removed, a ceramic filter is easy to block frequently, and long-period operation of the device is not facilitated.
Patent CN104445815B discloses a semi-coke production wastewater resource utilization process method and device, which comprises three parts of deep oil-water separation, efficient complexing extraction dephenolization and ammonia distillation, wherein wastewater is separated and recovered with part of coal tar in an oil-separating tank, and effluent passes through a coarse filter and then is sequentially recovered with a fine filter and an oil-water separator. The method has limited effect on removing oil-dust conjugates, dissolved oil and emulsified oil (especially below 20 mu m), and cannot ensure long-time operation of the phenol-ammonia recovery system.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a semi-coke wastewater pretreatment method and a semi-coke wastewater pretreatment device which are more efficient in oil dust removal.
In order to achieve the purpose, the invention is realized by the following technical scheme: a semi-coke wastewater pretreatment method and a device thereof comprise: primary oil removal, deep oil removal and tail gas absorption treatment; the preliminary oil removal comprises gravity settling, pre-filtering, demulsification and coalescence; the deep oil removal comprises the following steps: aeration deamination, dosing and mixing, standing, flat ceramic membrane filtration and concentration filtration; the tail gas absorption treatment comprises the following steps: the first absorption device and the second absorption device.
The preliminary oil removal is as follows: raw sewage water from the semi-coke device enters gravity settling primary oil separation to remove floating oil, heavy oil and partial dust, and then is sent to pre-filtration for primary filtration. And then the oil is sent to demulsification and coalescence to remove part of dispersed oil, thereby finishing primary oil removal.
The deep oil removal is as follows: and (2) performing aeration deamination on the sewage subjected to preliminary oil removal, removing part of free ammonia in the sewage, adding sulfuric acid in a chemical adding mixing process to adjust the pH value to 5-7, adding PAC (polyaluminium chloride), standing, discharging light oil and oil sludge from the upper part and the lower part respectively, conveying clear liquid from the middle part to a flat ceramic membrane (with the filtering precision of about 0.1 mu m), and filtering the oil sludge under the aeration condition to obtain process water. And (3) concentrating and filtering a mud-water mixture generated by standing and the flat ceramic membrane to obtain oil sludge and recovered water, and conveying the recovered water to the flat ceramic membrane for continuous filtration.
The tail gas absorption treatment comprises the following steps: and tail gas 1 generated by the aeration deamination is sent to the middle part of the first absorption device, tail gas 2 generated in the flat ceramic membrane process is sent to the lower part of the first absorption device, and the tail gas of the first absorption device enters the lower part of the second absorption device and is discharged after reaching the standard after being absorbed for the second time. And a part of the process produced water is sent to the tops of the first absorption device and the second absorption device for spraying, and absorption liquids at the bottoms of the first absorption device and the second absorption device and the rest process produced water are sent to the phenol ammonia recovery device together.
Preferably, the gravity settling can be carried out at the original temperature of the wastewater, and the retention time is about 4-12 h;
preferably, the filtering precision of the pre-filtering is adjusted according to the requirements of the demulsification and coalescence working procedures;
preferably, the aeration medium adopted by the aeration deamination and ceramic membrane filter is air;
preferably, adding medicines, mixing, adding sulfuric acid to adjust the pH to 5-7 is a necessary process, and PAC can be added according to actual conditions;
preferably, the residence time of the standing step is 3 to 8 hours.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method has reasonable flow, realizes the removal of emulsified oil, dissolved oil and oil-dust combination, can effectively reduce the oil-dust content in the feed of the phenol-ammonia recovery device, and effectively prolongs the operation period of the phenol-ammonia recovery device.
(2) According to the invention, the floating oil and the heavy oil are removed firstly, then the emulsified oil is removed, then the partially dissolved oil is separated out and fixed by adding acid and flocculation, and finally the oil-dust conjugate with small particle size is removed by filtering through the flat ceramic membrane, so that the oil-dust content in water can be effectively reduced, and the long-period operation can be ensured.
(3) The invention has reasonable dosing position and can effectively reduce the dosing amount of the device.
(4) The invention realizes the effective capture of volatile substances, effectively controls the on-site odor and simultaneously realizes the recovery of ammonia and other substances.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1, the present invention provides the following technical solutions: a semi-coke wastewater pretreatment method and a device are characterized by comprising the following steps: primary oil removal, deep oil removal and tail gas absorption treatment; the preliminary oil removal comprises gravity settling, pre-filtering, demulsification and coalescence; the deep oil removal comprises the following steps: aeration deamination, dosing and mixing, standing, flat ceramic membrane filtration and concentration filtration; the tail gas absorption treatment comprises the following steps: the first absorption device and the second absorption device.
The preliminary oil removal is as follows: raw sewage water from the semi-coke device enters gravity settling primary oil separation to remove floating oil, heavy oil and partial dust, and then is sent to pre-filtration for primary filtration. And then the oil is sent to demulsification and coalescence to remove part of dispersed oil, thereby finishing primary oil removal.
The deep oil removal is as follows: and (2) performing aeration deamination on the sewage subjected to preliminary oil removal, removing part of free ammonia in the sewage, adding sulfuric acid in a chemical adding mixing process to adjust the pH value to 5-7, adding PAC (polyaluminium chloride), standing, discharging light oil and oil sludge from the upper part and the lower part respectively, conveying clear liquid from the middle part to a flat ceramic membrane (with the filtering precision of about 0.1 mu m), and filtering the oil sludge under the aeration condition to obtain process water. And (3) concentrating and filtering a mud-water mixture generated by standing and the flat ceramic membrane to obtain oil sludge and recovered water, and conveying the recovered water to the flat ceramic membrane for continuous filtration.
The tail gas absorption treatment comprises the following steps: and tail gas 1 generated by the aeration deamination is sent to the middle part of the first absorption device, tail gas 2 generated in the flat ceramic membrane process is sent to the lower part of the first absorption device, and the tail gas of the first absorption device enters the lower part of the second absorption device and is discharged after reaching the standard after being absorbed for the second time. And a part of the process produced water is sent to the tops of the first absorption device and the second absorption device for spraying, and absorption liquids at the bottoms of the first absorption device and the second absorption device and the rest process produced water are sent to the phenol ammonia recovery device together.
Furthermore, the gravity settling can be carried out at the original temperature of the wastewater, and the retention time is about 4-12 h;
further, the filtering precision of the pre-filtering is adjusted according to the requirements of the demulsification and coalescence working procedures;
further, an aeration medium adopted by the aeration deamination and ceramic membrane filter is air;
further, adding medicines, mixing, adding sulfuric acid to adjust the pH to 5-7 to be a necessary process, wherein PAC can be added according to actual conditions;
further, the residence time of the standing procedure is 3-8 h.
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 (6)
1. A semi-coke wastewater pretreatment method and a device are characterized by comprising the following steps: the method comprises the steps of primary oil removal, deep oil removal and tail gas absorption treatment; the preliminary oil removal comprises gravity settling, pre-filtering, demulsification and coalescence; the deep oil removal comprises the following steps: aeration deamination, dosing and mixing, standing, flat ceramic membrane filtration and concentration filtration; the tail gas absorption treatment comprises the following steps: the first absorption device and the second absorption device;
the preliminary oil removal is as follows: raw sewage from the semi-coke device enters gravity settling primary oil separation to remove floating oil, heavy oil and partial dust, and then is sent to pre-filtration for primary filtration; then the oil is sent to demulsification and coalescence to remove part of dispersed oil, thereby finishing primary oil removal;
the deep oil removal is as follows: the sewage subjected to preliminary oil removal enters aeration deamination, part of free ammonia in the sewage is removed, sulfuric acid is added in a chemical adding and mixing process to adjust the pH value to 5-7, PAC is added, light oil and oil sludge are respectively discharged from the upper part and the lower part after standing, clear liquid is sent to a flat ceramic membrane from the middle part, the filtering precision is about 0.1 mu m), and process produced water is obtained after the oil sludge is filtered under the aeration condition; standing and carrying out concentration and filtration on a mud-water mixture generated by the flat ceramic membrane to obtain oil sludge and recovered water, and conveying the recovered water to the flat ceramic membrane for continuous filtration;
the tail gas absorption treatment comprises the following steps: conveying tail gas 1 generated by aeration deamination to the middle part of a first absorption device, conveying tail gas 2 generated in a flat ceramic membrane process to the lower part of the first absorption device, and allowing the tail gas of the first absorption device to enter the lower part of a second absorption device and to be discharged after reaching the standard after secondary absorption; and a part of the process produced water is sent to the tops of the first absorption device and the second absorption device for spraying, and absorption liquids at the bottoms of the first absorption device and the second absorption device and the rest process produced water are sent to the phenol ammonia recovery device together.
2. The method and the device for pretreating semi-coke wastewater according to claim 1, wherein the gravity settling can be performed at the original temperature of the wastewater, and the retention time is about 4-12 h.
3. The semi-coke wastewater pretreatment method and device according to claim 1, wherein the filtration precision of the pre-filtration is adjusted according to the requirements of the demulsification and coalescence process.
4. The semi-coke wastewater pretreatment method and device according to claim 1, wherein the aeration medium used by the aeration deamination and ceramic membrane filter is air.
5. The method and the device for pretreating semi-coke wastewater according to claim 1, wherein the process of adding chemicals, mixing and adding sulfuric acid to adjust the pH to 5-7 is necessary, and PAC can be added according to actual conditions.
6. The semi-coke wastewater pretreatment method and device according to claim 1, wherein the residence time of the standing process is 3-8 h.
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| CN202010913955.1A CN111892210B (en) | 2020-09-03 | 2020-09-03 | Semi-coke wastewater pretreatment method and device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445815A (en) * | 2014-11-21 | 2015-03-25 | 陕西华祥能源科技集团有限公司 | Technological method and device for semi-coke production wastewater resource utilization |
| CN105668864A (en) * | 2014-11-19 | 2016-06-15 | 中国石油化工股份有限公司 | Unconventional oil field exploration and development fracturing flowback fluid reuse treatment method |
| CN106430769A (en) * | 2016-07-12 | 2017-02-22 | 华陆工程科技有限责任公司 | Coal chemical industry wastewater pretreatment deamination technology and system |
| CN107434335A (en) * | 2017-09-01 | 2017-12-05 | 中国科学院过程工程研究所 | A kind of semi-coke wastewater phenol recovery ammonia comprehensive treatment method for recycling |
| CN207632635U (en) * | 2017-11-28 | 2018-07-20 | 北京中科康仑环境科技研究院有限公司 | A kind of pretreatment system for low temperature distillation waste water in coal |
-
2020
- 2020-09-03 CN CN202010913955.1A patent/CN111892210B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105668864A (en) * | 2014-11-19 | 2016-06-15 | 中国石油化工股份有限公司 | Unconventional oil field exploration and development fracturing flowback fluid reuse treatment method |
| CN104445815A (en) * | 2014-11-21 | 2015-03-25 | 陕西华祥能源科技集团有限公司 | Technological method and device for semi-coke production wastewater resource utilization |
| CN106430769A (en) * | 2016-07-12 | 2017-02-22 | 华陆工程科技有限责任公司 | Coal chemical industry wastewater pretreatment deamination technology and system |
| CN107434335A (en) * | 2017-09-01 | 2017-12-05 | 中国科学院过程工程研究所 | A kind of semi-coke wastewater phenol recovery ammonia comprehensive treatment method for recycling |
| CN207632635U (en) * | 2017-11-28 | 2018-07-20 | 北京中科康仑环境科技研究院有限公司 | A kind of pretreatment system for low temperature distillation waste water in coal |
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