CN113060814A - Method for removing and recovering phenol from high-concentration phenol-containing wastewater by precipitation method - Google Patents

Method for removing and recovering phenol from high-concentration phenol-containing wastewater by precipitation method Download PDF

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CN113060814A
CN113060814A CN202110373951.3A CN202110373951A CN113060814A CN 113060814 A CN113060814 A CN 113060814A CN 202110373951 A CN202110373951 A CN 202110373951A CN 113060814 A CN113060814 A CN 113060814A
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phenol
precipitation
concentration
wastewater
ion
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刘大华
徐延忠
陈任远
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Nanjing Liuyan Environmental Protection Technology Co ltd
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Nanjing Liuyan Environmental Protection Technology Co ltd
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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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions

Abstract

The invention discloses a method for removing and recovering phenol from high-concentration phenol-containing wastewater by precipitation, which comprises the steps of continuously connecting the high-concentration phenol-containing wastewater subjected to oil removal, deacidification and deamination in series into a two-stage precipitation and separation unit, wherein Ba is adopted in the first-stage precipitation2+Ion as precipitant to precipitate and separate phenol from high-concentration phenol-containing waste water, and secondary precipitation with Ba2+Ion precipitant for removing residual Ba from waste water2+Ion precipitation and separation, the said Ba2+The ion may be BaCl2、Ba(NO3)2The barium salt is soluble, and after the barium phenate is generated, the barium phenate can be regenerated by using acid containing the same anion to realize Ba2+And (4) recycling ions. Said Ba2+The ionic precipitating agent may be Na2SO4、H2SO4、CO2Sulfates, carbonates, etc., with Ba2+After the ion reaction, insoluble barium salt precipitate can be completely generated; the invention discloses a methodThe COD of the dephenolized wastewater treated by the method can be optimally reduced to below 3000mg/L, and the total phenols are reduced to below 200mg/L, Ba2+The concentration is lower than 5mg/L, the safe and stable operation requirements of the conventional subsequent biochemical treatment are met, and the heavy metal Ba2+The emission concentration is low, and the strict requirements of environmental emission standards can be met.

Description

Method for removing and recovering phenol from high-concentration phenol-containing wastewater by precipitation method
Technical Field
The invention relates to a method for removing and recovering phenol from high-concentration phenol-containing wastewater by a precipitation method, belonging to the technical field of high-concentration phenol-containing wastewater treatment.
Background
The coal chemical wastewater is high-concentration organic wastewater with extremely complex pollutant components and more difficultly-degradable substances, contains various pollutants such as oil, phenols, cyanides, sulfides and the like, and has extremely serious wastewater pollution degree in the industries such as coal gasification, coking, semi coke and the like. The phenol pollutants are strong in toxicity and complex in components, and not only are the phenol units but also the polyphenol, on one hand, the phenol pollutants also belong to pollutants difficult to treat in the coal chemical industry wastewater treatment, if the treatment is not good, the normal operation of a subsequent treatment unit can be influenced, on the other hand, the high-value phenol substances are recovered from the wastewater, the waste recycling is realized, the high economic value can be obtained, and the treatment cost of the high-concentration phenol-containing wastewater can be reduced.
The method for recovering phenol in wastewater is various, such as solvent extraction method, steam dephenolization method, adsorption dephenolization method, multi-effect evaporation sodium salt dephenolization method, metal ion precipitation dephenolization method, liquid membrane technology, ion exchange method and the like, and solvent extraction methods are mostly adopted in newly-built coal chemical industry and coking plants, but the energy consumption is high and the operation cost is high.
Chinese patent application No. CN201610552816.4 discloses a method for treating high-concentration phenol-containing wastewater in coal chemical industry, which comprises the following specific operations: extracting the high-concentration phenol-containing wastewater in the coal chemical industry by using a dephenolizing extraction agent methyl propyl ketone at the temperature of 30-80 ℃ to obtain an extract phase and a raffinate phase; wherein the total phenol content in the coal chemical industry high-concentration phenol-containing wastewater is not less than 2000 mg/L. The invention is more energy-saving in the solvent recovery stage, and the energy consumption of the water tower is greatly reduced; and the methyl propyl ketone has excellent extraction effect, so that the treatment method can effectively reduce the content of phenolic substances in the high-concentration phenol-containing wastewater. However, due to the diversity of polyphenol substances in the high-concentration phenol-containing wastewater in the coal chemical industry, it is difficult to select an extracting agent suitable for all polyphenols, especially for wastewater with more complex components such as coking wastewater, semi coke and the like, the extraction efficiency is remarkably reduced, the loss of the extracting agent is serious, the subsequent biochemical bacteria die, the device is difficult to stably operate, and the process flow of a phenol tower, a water tower and the like is long, the energy consumption is high, and the operation cost is high.
Chinese patent with application number CN201620059777.X discloses a device for preparing crude phenol by using sodium phenolate, and the utility model discloses a novel patent packetComprises the following steps: a pretreatment system: the dust content and the oil content in the sodium phenolate solution produced by extracting and dephenolizing the semi-coke production wastewater are reduced; acid separation system: taking the pretreated phenol sodium salt solution as a main fluid and the sulfuric acid solution as an auxiliary fluid for extracting crude phenol; a purification system: the method is used for purifying the extracted crude phenol and removing free acid in the crude phenol. The utility model discloses an use the sodium phenolate solution that blue charcoal waste water extraction dephenolization produced to produce crude phenol as the raw materials, sodium phenolate solution only can obtain crude phenol after pretreatment, acid precipitation, greatly reduced the corrosive action of sulphuric acid to the pipeline, and simple process, the route is short, has improved crude phenol's production efficiency greatly. The utility model discloses a patent is only handled the sodium phenolate of extraction process, phenol recovery part has optimized, can't avoid extraction process efficiency low, the serious scheduling problem of extractant loss, and adopts the phenol material reaction in NaOH and the extraction phase to generate sodium phenolate solution, and the coarse phenol is extracted in the acid out of reuse sulphuric acid, and NaOH consumption cost is high, the Na of formation2SO4The wastewater can not be recycled, so that the salt content in the wastewater is increased, and the difficulty of the subsequent desalination treatment of the wastewater is increased.
Chinese patent application No. CN200510021765.4 discloses a technique for removing and recovering phenol from coking wastewater, which is to remove and recover phenol substances in the coking wastewater by an ion precipitation method, and then reduce phenol in the wastewater to a low concentration level by a coke adsorption method. The invention selects barium ion (BaCl)2) As a precipitator, the phenol-containing water reacts with phenolic substances to generate insoluble compound precipitate, so that phenol is separated from the wastewater; then, hydrochloric acid is selected as a transfer solvent to dissolve the precipitate, and the precipitator barium ions are recycled; and adding a coke adsorbent into the coking wastewater after precipitation and dephenolization for treatment, and further reducing the phenol concentration. However, the invention has the disadvantages of large barium ion use scale, high operation cost, and easy heavy metal pollution caused by a large amount of barium ion residues formed in precipitated wastewater.
Disclosure of Invention
The invention provides a method for removing and recovering phenol from high-concentration phenol-containing wastewater by a precipitation method, which is used for overcoming the defects of long process flow, high energy consumption, high operation cost and easy heavy metal pollution in the prior art for treating chemical wastewater.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention discloses a method for removing and recovering phenol from high-concentration phenol-containing wastewater by precipitation, which comprises the steps of continuously connecting the high-concentration phenol-containing wastewater subjected to oil removal, deacidification and deamination in series into a two-stage precipitation and separation unit, wherein Ba is adopted in the first-stage precipitation2+Ion as precipitant to precipitate and separate phenol from high-concentration phenol-containing waste water, and secondary precipitation with Ba2+Ion precipitant for removing residual Ba from waste water2+And (5) precipitating and separating ions. The sequence of the deamination step is not limited to before or after the phenol removal and recovery step.
Further, said Ba2+The ion may be BaCl2、Ba(NO3)2The barium salt is soluble, and after the barium phenate is generated, the barium phenate can be regenerated by using acid containing the same anion to realize Ba2+And (4) recycling ions.
Further, said Ba2+The ionic precipitating agent may be Na2SO4、H2SO4、CO2Sulfates, carbonates, etc., with Ba2+After the ion reaction, the insoluble barium salt precipitate can be completely generated.
Further, the primary precipitation reactor and separator, the secondary precipitation reactor and separator are not limited in form, and may be a single device or a combination of multiple devices, and may be in various forms such as gravity precipitation, centrifugal precipitation, and the like, and may achieve the effects of precipitation reaction and precipitation separation.
Furthermore, the barium phenate acidification separator is not limited in form, can be single equipment or combination of multiple equipment, and can meet the requirements of added HCl and HNO3When the corrosion of acid is required, the effects of generating crude phenol by acidifying the barium phenate and separating oil from water can be realized.
Furthermore, the phenol-containing wastewater with the total concentration of phenolic substances being more than or equal to 200mg/L is preferably more than or equal to 1000mg/L, more preferably 2000 mg/L-20000 mg/L, the higher the phenol concentration is, the greater the recovery advantage is, and the phenol recovery rate can reach more than 90-95%.
Further, Ba of the primary precipitation reaction2+The ion may be BaCl2、Ba(NO3)2And (3) waiting for soluble barium salt, controlling the pH value of the primary precipitation reaction to be 9-12, further optimizing the pH value adjustment according to the phenol recovery rate and the stable operation condition of a subsequent wastewater biochemical treatment unit, reducing the dosage of NaOH, ammonia or ammonia water serving as a pH regulator as much as possible, and reducing the treatment difficulty of the subsequent wastewater biochemical treatment unit and a reclaimed water reuse unit.
Further, Ba of the secondary precipitation reaction2+The ionic precipitating agent may be Na2SO4、H2SO4、CO2Sulfates, carbonates, etc., with Ba2+After the ion reaction, insoluble barium salt precipitate can be completely generated, the pH value of the secondary precipitation reaction is controlled to be 7-12, and further according to Ba2+The ion emission index requires optimization of pH adjustment and the addition of a precipitant to avoid excessive addition of substances as much as possible.
Furthermore, the crude phenol generated by the barium phenate acidification separator is directly sold or simply treated and sold, and further purification measures can be adopted to meet the refining requirement of the crude phenol.
Further, the barium salt sediment of the secondary precipitation separator can be sent out for hazardous waste treatment or sent to a qualification unit for recycling after processes such as dehydration, drying and the like.
Further, the primary precipitation reaction is carried out by reacting with Ba2+The ion addition amount is controlled, the COD concentration in the effluent can be controlled to meet the water inlet requirement of a subsequent biochemical treatment process, the COD concentration can be controlled to be 3000-5000 mg/L, the total phenol content is about 600-1000 mg/L, the COD concentration can be further controlled to be less than or equal to 3000mg/L, and the total phenol content is further controlled to be less than or equal to 600 mg/L.
Further, the secondary precipitation reaction is carried out by reacting with Ba2+The adding amount of the ion precipitator is controlled, and Ba in the effluent can be controlled2+The ion concentration reaches 15-20 mg/L, further reaches less than or equal to 5mg/L, and can meet the strict requirements of environmental emission standards.
The invention has the following beneficial effects: the invention has the advantages of high reaction speed of the precipitation method, complete reaction, simple equipment structure and energy consumptionLow cost, stable and reliable technology, low investment and operation maintenance cost and the like, the higher the concentration of total phenol in the wastewater is, the higher the recovery value is, the treated wastewater can completely meet the safe and stable operation requirements of conventional subsequent biochemical treatment, and the heavy metal Ba2+The emission concentration is low, and the strict requirements of environmental emission standards can be met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of the operation of the present invention.
In the figure: 1. high-concentration phenol-containing wastewater; 2. ba2+Ions; 3. precipitating a barium phenolate salt; 4. an acid; 5. crude phenol; 6. ba2+Recycling ions; 7. ba2+An ionic precipitating agent; 8. precipitating a barium salt; 9. dephenolizing wastewater; 10. a first-stage precipitation reactor; 11. a first-stage precipitation separator; 12. a secondary precipitation reactor; 13. a secondary precipitation separator; 14. barium phenate salt acidification separator.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 1, a method for removing and recovering phenol from high-concentration phenol-containing wastewater by precipitation method comprises continuously connecting high-concentration phenol-containing wastewater in series into two-stage precipitation and separation units to obtain phenol barium salt precipitation, barium salt precipitation and dephenolized wastewater respectively, wherein the process comprises the following steps:
the high-concentration phenol-containing wastewater (1) enters a primary precipitation reactor (10), and the phenolic substances in the wastewater and the added Ba are added2+And (3) reacting the ions (2) to generate solid barium phenate, and enabling the wastewater after the reaction to enter a primary precipitation separator (11) to realize precipitation separation of the barium phenate precipitate (3) from the wastewater. The effluent of the primary precipitation separator enters a secondary precipitation reactor (12), and the residual Ba in the wastewater2+Ions with added Ba2+Ion precipitator (7) reacts to generate insoluble barium salt precipitate completely,the wastewater after the reaction enters a secondary precipitation separator (13) to realize the precipitation separation of barium salt precipitate (8) from the wastewater, and the dephenolized wastewater (9) goes to the subsequent biochemical treatment process.
The barium phenate precipitate (3) reacts with the added acid (4) in a barium phenate hydrochlorination separator (14) to generate crude phenol, and the crude phenol (5) flows out from the upper part of the acidification separator and the water phase flows out from the bottom of the acidification separator through the layering effect, namely Ba in the water phase2+And (6) recycling the ions to the first-stage precipitation reactor for reuse. The acid (4) added in the phenate acidification can be HCl and HNO3Etc. can be reacted with Ba2+Acid for ion formation of soluble salt, preferably with added Ba2+Ion (2) containing acid of the same anion, effecting Ba2+And (4) recycling ions.
Example 1
By applying the device for treating the high-concentration phenol-containing wastewater, after the wastewater of a certain coal gasification project is subjected to oil removal and deacidification, the total phenol content in the wastewater is 5000mg/L, and Ba is subjected to primary precipitation reaction2+The ions are BaCl2The hydrochloric acid of the phenol barium adopts HCl to control the pH value of the primary precipitation reaction to be 9.1, NaOH is selected as a pH regulator, the recovery rate of phenol reaches 88 percent after the primary precipitation reaction, the concentration of residual phenol in wastewater is 600mg/L, the concentration of COD is 3000mg/L, and the water inlet requirement of the subsequent biochemical treatment working section is met. Residual Ba in the wastewater after the first-stage precipitation reaction2+Ion concentration of 2100mg/L, Ba of secondary precipitation reaction2+The ion precipitator adopts Na2SO4Controlling the pH value of the secondary precipitation reaction to be about 9.1, and keeping the residual Ba in the wastewater after the secondary precipitation reaction2+The ion concentration is 5mg/L, and the strict environmental emission standard requirement can be met. The content of phenol in the byproduct crude phenol product of the project is more than or equal to 85 percent, and the crude phenol is purified and sold. The pH value of the treated wastewater is about 9.1, the concentration of residual phenol is 600mg/L, and residual Ba is2+The ion concentration is 5mg/L, and the ion is sent to a subsequent biochemical treatment unit.
Example 2
By applying the device for treating the high-concentration phenol-containing wastewater, after the wastewater of a certain coking project is subjected to oil removal, deacidification and deamination, the total phenol content in the wastewater is 9000mg/L, and Ba of primary precipitation reaction2+The ions are BaCl2The hydrochloric acid of the phenol barium adopts HCl to control the first gradeThe pH value of the precipitation reaction is 9.8, NaOH is selected as a pH regulator, after the primary precipitation reaction, the phenol recovery rate reaches 90%, the residual phenol concentration in the wastewater is 900mg/L, and the COD concentration is 4500mg/L, so that the water inlet requirement of the subsequent biochemical treatment working section is met. Residual Ba in the wastewater after the first-stage precipitation reaction2+Ion concentration 2000mg/L, Ba of secondary precipitation reaction2+The ion precipitator adopts Na2SO4Controlling the pH value of the secondary precipitation reaction to be about 9.8, and keeping the residual Ba in the wastewater after the secondary precipitation reaction2+The ion concentration is 10mg/L, and the strict environmental emission standard requirement can be met. The content of phenol in the byproduct crude phenol product of the project is more than or equal to 85 percent and the product can be directly sold. The pH value of the treated wastewater is about 9.8, the concentration of residual phenol is 900mg/L, and the residual Ba2+The ion concentration is 10mg/L, and the ion is sent to a subsequent biochemical treatment unit.
Example 3
By applying the device for treating the high-concentration phenol-containing wastewater, after the wastewater of a certain semi-coke project is subjected to oil removal and deacidification, the total phenol content in the wastewater is 15000mg/L, and Ba is subjected to primary precipitation reaction2+The ions are BaCl2·2H20, HCl is adopted for the hydrochloric acid of the phenol barium, the pH value of the primary precipitation reaction is controlled to be 11, NaOH is selected as a pH regulator, after the primary precipitation reaction, the phenol recovery rate reaches 94.7%, the residual phenol concentration in the wastewater is 800mg/L, the COD concentration is 4000mg/L, and the water inlet requirement of a subsequent biochemical treatment section is met. Residual Ba in the wastewater after the first-stage precipitation reaction2+Ion concentration 2000mg/L, Ba of secondary precipitation reaction2+The ion precipitator adopts Na2SO4Controlling the pH value of the secondary precipitation reaction to be about 11, and keeping the residual Ba in the wastewater after the secondary precipitation reaction2+The ion concentration is 5mg/L, and the strict environmental emission standard requirement can be met. The content of phenol in the byproduct crude phenol product of the project is more than or equal to 88 percent and the product can be directly sold. The pH value of the treated wastewater is about 11, the concentration of residual phenol is 800mg/L, and the residual Ba is2+The ion concentration is 5mg/L, and then the ammonia is sent to a subsequent biochemical treatment unit.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A method for removing and recovering phenol from high-concentration phenol-containing wastewater by a precipitation method is characterized in that the high-concentration phenol-containing wastewater is continuously connected in series and enters a two-stage precipitation and separation unit to respectively obtain phenol barium salt precipitation, barium salt precipitation and dephenolized wastewater, and the process comprises the following steps:
the high-concentration phenol-containing wastewater (1) enters a primary precipitation reactor (10), and the phenolic substances in the wastewater and the added Ba are added2+And (3) reacting the ions (2) to generate solid barium phenate, and enabling the wastewater after the reaction to enter a primary precipitation separator (11) to realize precipitation separation of the barium phenate precipitate (3) from the wastewater. The effluent of the primary precipitation separator enters a secondary precipitation reactor (12), and the residual Ba in the wastewater2+Ions with added Ba2+Ion precipitator (7) reacts to completely generate insoluble barium salt precipitate, the wastewater after the reaction enters a secondary precipitation separator (13) to realize the precipitation separation of the barium salt precipitate (8) from the wastewater, and the dephenolized wastewater (9) goes to the subsequent biochemical treatment process;
the barium phenate precipitate (3) reacts with the added acid (4) in a barium phenate hydrochlorination separator (14) to generate crude phenol, and the crude phenol (5) flows out from the upper part of the acidification separator and the water phase flows out from the bottom of the acidification separator through the layering effect, namely Ba in the water phase2+And recycling the ions (6) to the first-stage precipitation reactor (10) for reuse. The acid (4) added in the phenate acidification can be HCl and HNO3Etc. can be reacted with Ba2+Acid for ion formation of soluble salt, preferably with added Ba2+Ion (2) containing acid of the same anion, effecting Ba2+And (4) recycling ions.
2. The method for removing and recovering phenol by the precipitation method of high-concentration phenol-containing wastewater according to claim 1, wherein the total concentration of the phenol substances is more than or equal to 200mg/L and 20000 mg/L.
3. The method for removing and recovering phenol by precipitation of high-concentration phenol-containing wastewater according to claim 1, wherein Ba produced by the primary precipitation reactor (10) is Ba2+The ion (2) is BaCl2、Ba(NO3)2And (2) soluble barium salt, wherein the pH value in the primary precipitation reactor (10) is controlled to be 9-12, and NaOH, ammonia or ammonia water is selected as a pH regulator.
4. The method for removing and recovering phenol by precipitation of high-concentration phenol-containing wastewater according to claim 1, wherein Ba produced by the secondary precipitation reactor (12)2+The ion precipitator (7) is Na2SO4、H2SO4、CO2Sulfate, carbonate species, and Ba2+The ion (2) can completely generate insoluble barium salt precipitate (3) after reaction, the pH value in a secondary precipitation reactor (12) is controlled to be 7-12, and H is selected2SO4As a pH adjuster.
5. The method for removing and recovering phenol by precipitation from high-concentration phenol-containing wastewater according to claim 1, wherein the crude phenol (5) produced in the phenate salt acidification separator (14) is sold as a product or is simply treated and then sold as a product.
6. The method for removing and recovering phenol by the precipitation method of the high-concentration phenol-containing wastewater according to claim 1, wherein the barium salt precipitate (8) generated by the secondary precipitation separator (13) can be sent out for hazardous waste treatment or sent to a qualification unit for recovery after being subjected to processes such as dehydration, drying and the like.
7. The method for removing and recovering phenol by precipitation of high-concentration phenol-containing wastewater according to claim 1, wherein the primary precipitation reactor (10) is operated by para-Ba2+The adding amount of the ions (2) is controlled, the COD concentration in the effluent can be controlled to meet the water inlet requirement of the subsequent biochemical treatment process, the COD concentration is controlled to be 3000-5000 mg/L, and the total phenol content is controlled to be 600-1000 mg/L.
8. The method for removing and recovering phenol by precipitation of high-concentration phenol-containing wastewater according to claim 1, wherein the secondary precipitation reactor (12) is operated by para-Ba2+The adding amount of the ion precipitator (7) is controlled, and Ba in the effluent is controlled2+The concentration of the ions (2) reaches 15-20 mg/L, and further reaches less than or equal to 5mg/L, thereby meeting the requirements of environmental emission standards.
CN202110373951.3A 2021-04-07 2021-04-07 Method for removing and recovering phenol from high-concentration phenol-containing wastewater by precipitation method Pending CN113060814A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1789164A (en) * 2005-09-29 2006-06-21 中国科学院成都有机化学有限公司 Technique for removing and reclaiming phenol from coke-plant waste water
CN106082560A (en) * 2016-08-16 2016-11-09 涂瑞强 A kind of processing method of beneficiation wastewater
CN108862847A (en) * 2018-07-03 2018-11-23 北京清大国华环境股份有限公司 A kind for the treatment of method and apparatus of industry phenol wastewater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1789164A (en) * 2005-09-29 2006-06-21 中国科学院成都有机化学有限公司 Technique for removing and reclaiming phenol from coke-plant waste water
CN106082560A (en) * 2016-08-16 2016-11-09 涂瑞强 A kind of processing method of beneficiation wastewater
CN108862847A (en) * 2018-07-03 2018-11-23 北京清大国华环境股份有限公司 A kind for the treatment of method and apparatus of industry phenol wastewater

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