CN107512809B - Method for treating organic silicon wastewater - Google Patents
Method for treating organic silicon wastewater Download PDFInfo
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- CN107512809B CN107512809B CN201610431540.4A CN201610431540A CN107512809B CN 107512809 B CN107512809 B CN 107512809B CN 201610431540 A CN201610431540 A CN 201610431540A CN 107512809 B CN107512809 B CN 107512809B
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
Abstract
The invention discloses an organic silicon wastewater treatment method, and relates to the technical field of wastewater treatment. It comprises the following steps: adjusting the pH value of the wastewater to 7.0-8.5 by adding lime, and precipitating to remove most of condensable organic matters; adding one or two of NaOH and KOH into the supernatant after precipitation to adjust pH to above 11.5, heating to 60-80 deg.C, polymerizing for 5-12hr, and filtering; continuously adding acid into the filtered waste water at 60-80 deg.C, controlling pH to 3.0-4.0, and adding ferrous iron and hydrogen peroxide for chemical oxidation treatment for 4-6 hr; adding lime into the obtained clear liquid to adjust pH value to 6.0-8.5, standing, discharging clear liquid after reaching standards, dehydrating precipitate, drying, and transporting outside. The method has the advantages of simple and convenient operation, stable operation, no biochemical treatment process, high-efficiency removal of organic silicon pollutants in the wastewater and easy popularization and application.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for treating organic silicon wastewater.
Background
The organic silicon product is a chemical product with a silicon-oxygen (Si-O) bond as a main chain structure, has the characteristics of high temperature resistance, oxidation resistance and corrosion resistance, and is increasingly widely applied, but the wastewater discharged in the production of the organic silicon has the characteristics of strong acidity, complex chemical components, high toxicity, high salt content, high COD concentration, difficult degradation and the like, the biodegradability of the wastewater is poor, the ratio of BOD5 to COD is usually 0.01-0.1, the traditional biochemical degradation can hardly be carried out, the hydrolytic acidification and anaerobic aerobic treatment are carried out, and the COD of the effluent is still high. The treatment process of the organic silicon wastewater mostly selects Fenton or an improved Fenton process thereof, but effluent can not meet the discharge requirement; the membrane separation technology RO can obtain fresh water with very low COD, but concentrated water still needs to be treated; the waste water has low heat value and large salt content, and is easy to scale, block and damage equipment in evaporation and incineration. Therefore, the treatment of the organic silicon wastewater is still an industrial problem up to now.
In the method for treating the high-concentration organosilicon wastewater disclosed in the Chinese patent application No. CN101549938, the high-concentration organosilicon wastewater is firstly subjected to characteristic conditioning, the water permeability of filter pressing is enhanced, solid-liquid separation is carried out, and supernatant after the solid-liquid separation is pumped into an evaporative condenser, so that volatile pollutants and wastewater are separated from the wastewater in a gas form; however, the energy consumption for evaporating the waste water is large, the waste gas can generate secondary pollution, and the equipment is easy to scale and block. The invention discloses a method for treating organic silicon wastewater, which is disclosed in patent application No. CN101759329A and optimally combines a pretreatment unit and a biochemical unit, wherein a preneutralization tank is arranged at the front end of the process flow, wastewater is neutralized until the pH value is about 1-2, the wastewater enters a microelectrolysis reactor, microelectrolysis filler is filled in the reactor, the effluent enters a secondary neutralization tank, the water quantity and the pH value are further regulated, the effluent enters a biochemical treatment facility, and finally the effluent enters a secondary sedimentation tank. The invention patent application No. CN102336454A also discloses the application of a catalytic internal electrolysis method in the treatment of organic silicon wastewater, which improves the B/C ratio, enables the organic silicon wastewater to be changed from industrial wastewater which is difficult to degrade into industrial wastewater which is easy to degrade, realizes the complete biochemical treatment of the organic silicon wastewater and creates powerful conditions for realizing the discharge reaching the standard. The invention patent application No. CN102001800A discloses a purification treatment method of organosilicon-containing wastewater with low cost, which comprises the steps of sequentially carrying out anaerobic reaction, aerobic reaction, coagulating sedimentation, ozone oxidation, secondary aerobic reaction, secondary coagulating sedimentation and secondary ozone oxidation treatment on the organosilicon-containing wastewater. However, the biodegradability of organosilicon wastewater is poor, and even if these enhanced pretreatment techniques are used, it is difficult for the microbial treatment method to effectively remove organosilicon-based pollutants from the wastewater. The organic silicon product takes silicon-oxygen (Si-O) bonds as a main chain structure, the bond energy of the C-C bonds is 82.6 kilocalories per gram molecule, the bond energy of the Si-O bonds is 121 kilocalories per gram molecule in organic silicon, the silicon-oxygen bonds are difficult to oxidize and break, and siloxane monomers in wastewater are difficult to remove.
In order to solve the problems, a novel method for treating the organic silicon wastewater is particularly necessary.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the method for treating the organic silicon wastewater, which is simple and convenient to operate, stable to operate, free of biochemical treatment process, capable of efficiently removing organic silicon pollutants in the wastewater and easy to popularize and use.
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for treating organic silicon wastewater comprises the following steps:
(1) adjusting the pH value of the wastewater to 7.0-8.5 by adding lime, and precipitating to remove most condensable organic matters;
(2) adding one or two of NaOH and KOH into the supernatant after precipitation to adjust pH to above 11.5, heating to 60-80 deg.C, polymerizing for 5-12hr, and filtering;
(3) continuously adding acid into the filtered waste water at 60-80 deg.C, controlling pH to 3.0-4.0, and adding ferrous iron and hydrogen peroxide for chemical oxidation treatment for 4-6 hr;
(4) further adding lime into the obtained clear liquid to adjust the pH value to 6.0-8.5, standing, discharging the clear liquid after reaching the standard, and dehydrating, drying and transporting the precipitate.
The invention has the beneficial effects that: does not contain the biochemical treatment process, the COD of the treated wastewater can be obviously reduced, the operation is stable, the operation is simple and convenient, and the method has great popularization value.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1, the following technical solutions are adopted in the present embodiment: a method for treating organic silicon wastewater comprises the following steps: (1) the organic silicon wastewater is generally acidic, the pH value of the wastewater is adjusted to 7.0-8.5 by adding lime, and most of condensable organic matters are removed by precipitation;
(2) adding one or two of NaOH and KOH into the supernatant after precipitation to adjust pH to above 11.5, heating to 60-80 deg.C, polymerizing for 5-12hr, and filtering;
(3) continuously adding acid into the filtered waste water at 60-80 deg.C, controlling pH to 3.0-4.0, and adding ferrous iron and hydrogen peroxide for chemical oxidation treatment for 4-6 hr;
(4) further adding lime into the obtained clear liquid to adjust the pH value to 6.0-8.5, standing, remarkably reducing COD of the treated wastewater, discharging the clear liquid after reaching the standard, and dehydrating, drying and transporting the precipitate.
Example 1: raw water COD of the organic silicon wastewater is 1200mg/L, and the pH value is 1.1; adding lime to adjust the pH value of the wastewater to 8.5, and precipitating to remove part of organic matters; adding NaOH alkali into the clear solution after precipitation to adjust pH to 11.8, heating to 60 deg.C, polymerizing for 12hr, and filtering; and (3) continuously adding acid into the filtered wastewater at 60 ℃ to control the pH to be 3.0, and adding 1.0kg of ferrous sulfate and 20kg of 27.5% hydrogen peroxide into each ton of wastewater to perform chemical oxidation treatment for 5 hours, wherein the COD of the treated wastewater is reduced to 165 mg/L.
Example 2: raw water COD of the organic silicon wastewater is 1800mg/L, and the pH value is 0.5; adding lime to adjust the pH value of the wastewater to 7.0, and precipitating to remove part of organic matters; adding NaOH and KOH into the supernatant after precipitation to adjust pH to 11.5, heating to 80 deg.C, polymerizing the organosilicon monomer for 5hr, and filtering; and continuously adding acid into the filtered wastewater at 80 ℃ to control the pH to be 4.0, and adding 1.0kg of ferrous sulfate and 25kg of 27.5% hydrogen peroxide into each ton of wastewater to perform chemical oxidation treatment for 6 hours, wherein the COD of the treated wastewater is reduced to 204 mg/L.
Example 3: raw water COD of the organic silicon wastewater is 1600mg/L, and the pH value is 0.9; adding lime to adjust the pH value of the wastewater to 7.5, and precipitating to remove part of organic matters; adding NaOH and KOH into the supernatant after precipitation to adjust pH to 12.0, heating to 70 deg.C, polymerizing the organosilicon monomer for 5hr, and filtering; and continuously adding acid into the filtered wastewater at 70 ℃, controlling the pH to be 3.5, adding 1.0kg of ferrous sulfate and 25kg of 27.5% hydrogen peroxide into each ton of wastewater, and performing chemical oxidation treatment for 5 hours to reduce the COD of the treated wastewater to 210 mg/L.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A method for treating organic silicon wastewater is characterized by comprising the following steps:
(1) adjusting the pH value of the wastewater to 7.0-8.5 by adding lime, and precipitating to remove most condensable organic matters;
(2) adding one or two of NaOH and KOH into the supernatant after precipitation to adjust pH to above 11.5, heating to 60-80 deg.C, polymerizing for 5-12hr, and filtering;
(3) continuously adding acid into the filtered waste water at 60-80 deg.C, controlling pH to 3.0-4.0, and adding ferrous iron and hydrogen peroxide for chemical oxidation treatment for 4-6 hr;
(4) further adding lime into the obtained clear liquid to adjust the pH value to 6.0-8.5, standing, discharging the clear liquid after reaching the standard, and dehydrating, drying and transporting the precipitate.
2. The method for treating the organic silicon wastewater as claimed in claim 1, characterized by comprising the following steps: adding lime to adjust the pH value of the organosilicon wastewater to 8.5, precipitating, removing part of organic matters, adding NaOH to adjust the pH value of the precipitated clear liquid to 11.8, heating to 60 ℃, polymerizing organosilicon monomers for 12 hours, filtering, continuously adding acid to the filtered wastewater at 60 ℃, controlling the pH value to be 3.0, and adding 1.0kg of ferrous sulfate and 20kg of 27.5% hydrogen peroxide to each ton of wastewater to perform chemical oxidation treatment for 5 hours.
3. The method for treating the organic silicon wastewater as claimed in claim 1, characterized by comprising the following steps: adding lime to adjust the pH value of the organic silicon wastewater to 7.0, precipitating, removing partial organic matters, adding NaOH and KOH to adjust the pH value to 11.5, heating to 80 ℃, polymerizing organic silicon monomers for 5 hours, filtering, continuously adding acid to the filtered wastewater at 80 ℃, controlling the pH value to 4.0, and adding 1.0kg of ferrous sulfate and 25kg of 27.5% hydrogen peroxide to each ton of wastewater to perform chemical oxidation treatment for 6 hours.
4. The method for treating the organic silicon wastewater as claimed in claim 1, characterized by comprising the following steps: adding lime to adjust the pH value of the organic silicon wastewater to 7.5, precipitating, removing partial organic matters, adding NaOH and KOH to adjust the pH value to 12.0, heating to 70 ℃, polymerizing organic silicon monomers for 5 hours, filtering, continuously adding acid to the filtered wastewater at 70 ℃, controlling the pH value to 3.5, and adding 1.0kg of ferrous sulfate and 25kg of 27.5% hydrogen peroxide to each ton of wastewater to perform chemical oxidation treatment for 5 hours.
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| CN201610431540.4A CN107512809B (en) | 2016-06-17 | 2016-06-17 | Method for treating organic silicon wastewater |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106430743B (en) * | 2016-12-23 | 2023-04-25 | 唐山三友硅业有限责任公司 | Device and method for treating organic silicon wastewater |
| CN108801954B (en) * | 2018-06-28 | 2021-05-14 | 湖北兴瑞硅材料有限公司 | Method for measuring content of iron ions in organic silicon product |
| CN112456673B (en) * | 2020-10-12 | 2022-04-12 | 浙江省环境科技有限公司 | Method for improving biodegradability of organic silicon wastewater |
| CN114477630A (en) * | 2022-01-21 | 2022-05-13 | 内蒙古恒星化学有限公司 | High salt effluent disposal system |
| CN114436440A (en) * | 2022-01-21 | 2022-05-06 | 内蒙古恒星化学有限公司 | Processing system of low salt waste water in organosilicon production |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1024143A2 (en) * | 1999-01-28 | 2000-08-02 | Consortium für elektrochemische Industrie GmbH | Process for preparing alpha,beta-unsaturated carboxylic acid group-containing organosilicon compounds |
| CN101786740A (en) * | 2010-02-10 | 2010-07-28 | 山东东岳有机硅材料有限公司 | Treatment method for oily waste water in production of organic silicon monomer |
| CN102001775A (en) * | 2010-10-22 | 2011-04-06 | 蓝星环境工程有限公司 | Pretreatment process of organic silicon wastewater |
| CN102001800A (en) * | 2010-12-28 | 2011-04-06 | 泸州北方化学工业有限公司 | Method for purifying wastewater containing organosilicon |
| CN102355931A (en) * | 2009-03-17 | 2012-02-15 | 瓦克化学股份公司 | Separation of organosilicon compounds from wastewater |
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- 2016-06-17 CN CN201610431540.4A patent/CN107512809B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1024143A2 (en) * | 1999-01-28 | 2000-08-02 | Consortium für elektrochemische Industrie GmbH | Process for preparing alpha,beta-unsaturated carboxylic acid group-containing organosilicon compounds |
| CN102355931A (en) * | 2009-03-17 | 2012-02-15 | 瓦克化学股份公司 | Separation of organosilicon compounds from wastewater |
| CN101786740A (en) * | 2010-02-10 | 2010-07-28 | 山东东岳有机硅材料有限公司 | Treatment method for oily waste water in production of organic silicon monomer |
| CN102001775A (en) * | 2010-10-22 | 2011-04-06 | 蓝星环境工程有限公司 | Pretreatment process of organic silicon wastewater |
| CN102001800A (en) * | 2010-12-28 | 2011-04-06 | 泸州北方化学工业有限公司 | Method for purifying wastewater containing organosilicon |
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