Pre-treating method of metacresol production effluent

A pretreatment, m-cresol technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Deal with problems such as difficulty, and achieve the effect of stable and reliable treatment effect, good water quality and fast response speed.

Inactive Publication Date: 2003-03-19
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

Method used

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  • Pre-treating method of metacresol production effluent
  • Pre-treating method of metacresol production effluent

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0037] Example 1

[0038] Take 100ml of m-cresol production oxidation wastewater (its COD Cr 78,000 mg / L), after cooling to 25°C, 98% concentrated sulfuric acid was added to adjust the pH of the wastewater to 3.5. Then, it was stirred rapidly at a speed of 600 rpm for 15 minutes and allowed to stand for 15 minutes. After removing the sunken oil and slick oil in the oxidizing wastewater and filtering, 75 ml of the oxidizing wastewater is taken, and 5 ml of tributyl phosphate is added in the ratio of the volume ratio of the extractant to the oxidizing wastewater of 1:15, and the extraction time is 20 minutes. After extraction, oil-water separation is carried out, and the extracted oxidation wastewater, i.e. raffinate, is mixed with the other two m-cresol production wastewaters and then subjected to contact oxidation treatment. At the same time, the extract is back-extracted, and under the condition that the volume ratio of the extract and the sodium hydroxide solution is 3:1, 20% so...

Example Embodiment

[0040] Example 2

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

[0042] Adjust pH=3.0, quickly stir, stand still, separate and filter the COD of wastewater Cr 52,860mg / L, COD Cr Removal rate is 32.2%; 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.

Example Embodiment

[0043] Example 3

[0044] The volume ratio of the extractant to the oxidized wastewater obtained after the acidification treatment is 1:5, and 15 ml of tributyl phosphate is added. The extraction time is 35 minutes, and the remaining conditions are the same as in Example 1.

[0045] Adjust pH=3.5, quickly stir, stand still, separate and filter the COD of wastewater Cr 56,710mg / L, COD Cr The removal rate is 27.3%; COD of wastewater after extraction Cr 19,860mg / L, total COD Cr The removal rate is 74.5%, 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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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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