Pre-treating method of metacresol production effluent

A pretreatment, m-cresol technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem that the CODCr removal rate is not very ideal, can not meet the discharge requirements, extraction To avoid problems such as large amount of agent, to achieve stable and reliable treatment effect, good water quality and fast response

Inactive Publication Date: 2004-10-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It can be seen that, as far as the above-mentioned patent is concerned, the method for treating high-concentration organic wastewater by extraction method still has the following disadvantages: ① the amount of extractant is relatively large; ② the COD of wastewater after extraction Cr The removal rate is not very ideal, which brings difficulties to the subsequent biochemical treatment
However, the COD of the wastewater after such treatment Cr Still higher than 800mg / L, unable to meet emission requirements

Method used

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  • Pre-treating method of metacresol production effluent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Get m-cresol production oxidation wastewater 100ml (its COD Cr 78,000mg / L), after cooling down to 25°C, adding concentrated sulfuric acid with a concentration of 98% to adjust the pH of the wastewater to 3.5. Then stir rapidly at 600rpm for 15 minutes, and let stand for 15 minutes. After removing sunken oil and slick oil in the oxidized wastewater and filtering, take 75ml of oxidized wastewater, add 5ml of tributyl phosphate according to the volume ratio of extractant to oxidized wastewater at a ratio of 1:15, and the extraction time is 20 minutes. After the extraction, oil-water separation is carried out, and the oxidation waste water after extraction, that is, the raffinate, is mixed with the other two m-cresol production discharge waste water, and then the contact oxidation treatment is carried out. At the same time, the extract was back-extracted, and the condition was that the volume ratio of the extract to the sodium hydroxide solution was 3:1 and 20% sodium hydr...

Embodiment 2

[0041] In the acidification treatment step of the oxidized wastewater, the pH of the oxidized wastewater was adjusted to 3.0, and the rest of the conditions were the same as in Example 1.

[0042] COD of wastewater after adjusting pH=3.0, rapid stirring, standing still, separation and filtration Cr 52,860mg / L, COD Cr The removal rate is 32.2%; the COD of wastewater after extraction Cr 24,386mg / L, total COD Cr The removal rate is 68.7%, and the effluent COD after contact oxidation treatment Cr It is 613mg / L.

Embodiment 3

[0044] The volume ratio of the extractant to the oxidized waste water obtained after the acidification treatment was 1:5, and 15ml of tributyl phosphate was added. The extraction time was 35 minutes, and the rest of the conditions were the same as in Example 1.

[0045] COD of wastewater after adjusting pH=3.5, rapid stirring, standing still, separation and filtration Cr 56,710mg / L, COD Cr The removal rate is 27.3%; the COD of wastewater after extraction Cr 19,860mg / L, total COD Cr The removal rate is 74.5%, and the effluent COD after contact oxidation treatment Cr It is 542mg / L.

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Abstract

The present invention relates to the technology of organic chemical effluent treatment. The pre-treating method can reduce the consumption of extracting agent, and the CODcr eliminating rate of the effluent in the pre-treatment may reach 60% being favorable to subsequent biochemical treatment. The process includes the acidifying pre-treatment of oxide effluent from metacresol production, the extracting treatment with extracting agent, such as tributyl phosphate, mixing of the effluent after the extracting treatment and other two kinds of waste water discharged from metacresol production, and the subsequent biochemical treatment. The said pre-treating process can eliminate great amount of hard-to-degrade matter to raise the efficiency of biochemical treatment and recover high purity phenol matter.

Description

technical field [0001] The invention relates to a treatment method of organic chemical wastewater, and more specifically, relates to a treatment method of m-cresol production discharge wastewater. Background technique [0002] m-cresol is an important chemical raw material. During the production of m-cresol, high-concentration organic wastewater with complex components will be discharged, especially during the oxidation of isopropyl toluene and the acidolysis of isopropyl toluene hydroperoxide. Produced oxidized wastewater, COD Cr Very high, about 50,000-90,000 mg / L; in addition, there are oily wastewater generated during the refining of cumene and phenolic wastewater generated during the neutralization process after acid hydrolysis. COD after mixing the above three waters Cr As high as 12,000mg / L, and the biodegradability is poor, it is difficult to meet the discharge requirements by direct biochemical treatment, so it is necessary to properly treat the mixed wastewater b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D17/02C02F9/02C02F9/08C02F9/14
Inventor 程学文胡家祥蒋晓菁杜蓓王宜军王秀兰李小丹栾金义
Owner CHINA PETROLEUM & CHEM CORP
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