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Treating method of metacresol production effluent

A treatment method, m-cresol technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of increasing acid consumption and treatment costs, large hydrogen peroxide The addition amount, the inability to meet the emission requirements and other problems, to achieve the effect of stable and reliable treatment effect, low treatment cost and fast reaction speed

Inactive Publication Date: 2004-10-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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AI Technical Summary

Problems solved by technology

For the treatment of m-cresol oxidation wastewater, the above method still has some deficiencies: ① due to the COD of m-cresol oxidation wastewater Cr Therefore, according to the above method, to achieve the expected treatment effect, a large amount of hydrogen peroxide addition is required; ②and the pH adjustment of this method in wastewater treatment is low, which greatly increases the acid consumption and treatment costs; ③ Simultaneously the time of this method reaction is too long; 4. in addition the pH adjustment after oxidation, the above-mentioned patent thinks that should be between 7.0~9.0, thinks that can avoid the appearance of ferric salt rubbish like this, in fact in this pH range, occasionally The effect of subsequent biochemical treatment of cresol wastewater is not ideal, so it is necessary to increase the pH value to try to completely remove excess iron salts
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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  • Treating method of metacresol production effluent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Get m-cresol production oxidation wastewater 100ml (its COD Cr 78,000mg / L), after cooling down to 25°C, concentrated sulfuric acid with a concentration of 98% was added to adjust the pH of the wastewater to 4.0. Afterwards, stir rapidly at a speed of 600 rpm for 15 minutes, and stand still for 15 minutes. After removing the sunken oil and floating oil in the oxidized wastewater and filtering, according to the H 2 o 2 / COD Cr = 0.3 (w / w, pure substance weight ratio) Add hydrogen peroxide to waste water, according to Fe 2+ / H 2 o 2 = 0.25 (w / w, pure substance weight ratio) Add FeSO to wastewater 4 ·7H 2 O, the free radical reaction time is taken as 30 minutes. After the free radical reaction, a solution with a concentration of 20% NaOH was added to the oxidation wastewater to adjust the pH to 10.0. The waste water is then filtered to remove the sediment. Then the pretreated oxidized wastewater is mixed with the other two streams of wastewater for contact oxidati...

Embodiment 2

[0029] In addition to the amount of hydrogen peroxide added according to H 2 o 2 / COD Cr Except =0.4 (w / w, pure substance weight ratio), all the other conditions are with embodiment 1.

[0030] COD of wastewater after adjusting pH=4.0, rapid stirring, standing still, separation and filtration Cr 61,223mg / L, COD Cr The removal rate is 21.5%; after free radical reaction and pH adjustment = 10.0, the COD of wastewater after filtration Cr 21,185mg / L, total COD Cr The removal rate was 72.8%, the effluent CODcr was 572mg / L after contact oxidation treatment, and the biochemical reaction was running well.

Embodiment 3

[0032] In the acidification pretreatment 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.

[0033] COD of wastewater after adjusting pH=3.0, rapid stirring, standing still, separation and filtration Cr 52,880mg / L, COD Cr The removal rate is 32.2%; after free radical reaction and pH adjustment = 10.0, the COD of wastewater after filtration Cr 20,370mg / L, total COD Cr The removal rate was 73.9%. After contact oxidation treatment, the CODcr of the effluent was 524mg / L, and the biochemical reaction was running well.

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Abstract

The present invention relates to the technology of organic chemical effluent treatment. The treating method can reduce the consumption of treating agent, and the CODcr eliminating rate of the effluent in the pre-treatment may reach 60% being favorable to subsequent biochemical treatment. The treating process includes the pre-treatment of oxide effluent from metacresol production, mixing of the effluent after the pre-treatment and other two kinds of waste water exhausted from metacresol production, and the subsequent oxidation treatment. The said process has stable treatment effect, low treatment cost and simple and practical operation.

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): C02F9/02C02F9/14
Inventor 程学文胡家祥李小丹蒋晓菁杜蓓王宜军王秀兰栾金义
Owner CHINA PETROLEUM & CHEM CORP
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