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Method for treating ethylene waste alkali liquor

A technology for ethylene waste lye and treatment method, which is applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. It can improve the biodegradability and improve the removal effect.

Active Publication Date: 2014-04-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the waste lye treated by this method has poor biodegradability and cannot be directly biochemically treated. It needs to be diluted before being passed into the biochemical treatment device, and a large amount of water will be consumed in the process; and the waste lye is likely to cause shock loads on the biochemical system. , destroy the stable operation of the biochemical system; the long-term accumulation of persistent organic pollutants in the waste lye will affect the performance of the biochemical system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Pass the waste lye into the wet oxidation treatment device, the pressure is 1.2MPa, the temperature is 150°C, and the residence time is 120min; after the wet oxidation treatment, the COD removal rate of the wastewater is 33%, and the sulfur content is 1.9mg / L.

[0023] The reactor is a vertical sleeve type. The mixed waste lye enters the outer upper part of the inner cylinder and flows from top to bottom. Oxidizing air enters from the bottom of the inner cylinder, flows from bottom to top and mixes with the liquid. Part of the rising material is drawn out through the pressure control valve, and most of the material circulates inside and outside the cylinder. The effluent after the reaction enters the washing tower in the gas-liquid mixed phase. The gas phase vapor is condensed by contact with the circulating cooling liquid, and the excess air is exhausted from the top of the scrubber. The liquid phase effluent and condensate are withdrawn from the bottom of the...

Embodiment 2

[0028] (1) Pass the waste lye into the wet oxidation treatment device, the pressure is 1.5MPa, the temperature is 170°C, and the residence time is 90min. After the wet oxidation treatment, the COD removal rate of the wastewater is 36%, and the sulfur content is 1.4mg / L.

[0029] (2) The waste water after wet oxidation is processed through the micro-electrolysis reactor, and ozone is introduced into the micro-electrolysis reactor. The conditions of the micro-electrolysis reactor are: Cu / Fe mass ratio is 97: 3, pH value is 4.5, the filling rate is 30%, and the aeration treatment time is 7h. The COD removal rate of micro-electrolysis reaction treatment is 68%.

[0030](3) adjust the pH of the micro-electrolysis treatment effluent to be 7.5, add calcium carbonate, the mol ratio of the add-on of calcium carbonate and the sulfate ion in the micro-electrolysis treatment effluent is 0.7: 1, then carry out precipitation separation after stirring 30min ; Ethylene waste lye after the ...

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PUM

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Abstract

The invention relates to a method for treating ethylene waste alkali liquor, which is characterized by comprising the following steps of: performing wet oxidation treatment on the ethylene waste alkali liquor to remove most sulfides and part of chemical oxygen demand (COD) therein; treating by using an iron-copper micro-electrolysis reactor into which ozone is introduced to improve the biochemical degradability of wastewater; adding a precipitating agent to further remove the sulfides and harmful substances from the wastewater; and performing biochemical treatment to further remove the COD from the wastewater. The method has the characteristics of good sulfide and COD treatment effect, stable effluent quality, low treatment cost and the like.

Description

technical field [0001] The invention relates to a treatment method for high-sulfur waste water, more specifically, to a treatment method for ethylene waste lye. Background technique [0002] Ethylene is an important basic organic raw material. With the development of the national economy and the improvement of living standards, the demand for ethylene has increased significantly. The newly built and expanded ethylene production capacity has increased significantly in recent years. Ethylene waste lye is the main source of ethylene production. The main source of pollution is the focus of pollution prevention and control of ethylene production enterprises. The waste lye produced by the ethylene plant is a typical high-concentration, biodegradable organic process wastewater containing oil, volatile phenols, sulfides and inorganic salts, and the chemical oxygen demand (COD) value is as high as tens of thousands or even hundreds of thousands , must be properly pre-treated before ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/72C02F1/461C02F1/28
Inventor 刘恒齐红卫修锐董欣杨宁季迎江柳
Owner CHINA PETROLEUM & CHEM CORP