A kind of treatment method of ethylene waste lye

A technology for ethylene waste lye and treatment methods, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor effluent quality, low biochemical treatment efficiency, and dilution water consumption Large and other problems, to achieve stable operation, reduce COD, and good water quality

Active Publication Date: 2018-03-02
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of large dilution water consumption, low biochemical treatment efficiency and poor effluent quality in the existing ethylene waste lye treatment technology, the present invention provides a method for separately treating ethylene waste lye: electrolytic catalytic oxidation-aerobic biochemical- Catalyzed Fenton oxidation process, including the following steps:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Ethylene waste lye is taken from a petrochemical enterprise ethylene waste lye wet oxidation workshop, its main water quality characteristics are as follows: COD: 6463mg / L, chroma: 150, pH value: 13.0, conductivity (conductivity): 40500us / cm, Na+ : 15125.9mg / L, SO 4 2- , S 2 o 3 2- and SO 3 2- Total amount: 21868.3mg / L.

[0034] (1) Adjust the pH value of ethylene waste lye to 3.0 with concentrated sulfuric acid.

[0035] (2) The ethylene waste lye with adjusted pH value enters the electrolytic catalytic oxidation reactor. The volume of the electrolytic catalytic oxidation reactor is 18L, with an insoluble electrode (Ir / Ti) as the anode and SUS316 as the cathode. The electrolysis is carried out in the way of reflux outside the system (that is, the water is circulated in the way of external reflux), and the reflux flow is 850ml / min. The operating conditions of the electrolytic catalytic oxidation are: operating voltage 4.5V, operating current 150A. The electrol...

Embodiment 2

[0045] Ethylene waste lye is taken from a petrochemical enterprise ethylene waste lye wet oxidation workshop, its main water quality characteristics are as follows: COD: 5639mg / L, chroma: 100, pH value: 13.5, conductivity: 37200us / cm, Na + : 12220.5mg / L, SO 4 2- , S 2 o 3 2- and SO 3 2- Total amount: 16458.2mg / L.

[0046] (1) Adjust the pH value of the ethylene waste lye to 3.5 with concentrated sulfuric acid.

[0047] (2) The ethylene waste lye with adjusted pH value enters the electrolytic catalytic oxidation reactor. The volume of the electrolytic catalytic oxidation reactor is 18L, with an insoluble electrode (Ir / Ti) as the anode and SUS316 as the cathode. The electrolysis is carried out by reflux outside the system, and the reflux flow is 850ml / min. The operating conditions of the electrolytic catalytic oxidation are: operating voltage 4.8V, operating current 150A. The electrolysis time was 75 min.

[0048] (3) The effluent water after electrolytic catalytic ox...

Embodiment 3

[0057] Ethylene waste lye is taken from a petrochemical enterprise ethylene waste lye wet oxidation workshop, its main water quality characteristics are as follows: COD: 4276mg / L, chroma: 200, pH value: 12.7, conductivity: 49700us / cm, Na + : 17067.2mg / L, SO 4 2- , S 2 o 3 2- and SO 3 2- Total amount: 18817.8mg / L.

[0058] (1) Adjust the pH value of the spent ethylene liquor to 4.0 with concentrated sulfuric acid.

[0059] (2) The ethylene waste lye with adjusted pH value enters the electrolytic catalytic oxidation reactor. The volume of the electrolytic catalytic oxidation reactor is 18L, with an insoluble electrode (Ir / Ti) as the anode and SUS316 as the cathode. The electrolysis is carried out by reflux outside the system, and the reflux flow is 850ml / min. The operating conditions of the electrolytic catalytic oxidation are: operating voltage 5.0V, operating current 150A. The electrolysis time was 90 min.

[0060] (3) The effluent water after electrolytic catalytic...

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Abstract

The present invention an ethylene spent lye treatment method. The method is characterized by comprising the steps of: first, pretreating an ethylene spent lye by electrolytic catalytic oxidation to remove part of COD and improve the biodegradability of the spent lye; second, conducting aerobic biochemical treatment by using a sludge adding mode combining conventional activated sludge and biological engineering bacteria, in order to improve the biochemical treatment efficiency; and finally, conducting catalytic Fenton oxidation for further removal of COD in the spent lye. The method has the advantages of stable operation process, high treatment efficiency, good outlet water quality, colorless odorless clear and transparent outlet water, and COD less than 150 mg / L, and realizes the individual treatment and depth treatment of the ethylene spent lye.

Description

technical field [0001] The invention relates to a method for treating petrochemical waste water with high salinity and high COD, more specifically, relates to a method for treating waste ethylene lye after wet oxidation pretreatment. Background technique [0002] Ethylene waste lye is the waste liquid formed after the acid gas produced in the ethylene production process is processed by alkali washing, which contains not only the remaining NaOH, but also the Na produced in the alkali washing process. 2 S, Na 2 CO 3 At the same time, due to the condensation of heavy components in the cracking gas and the polymerization of diolefins, a large amount of organic matter also enters the waste lye. Therefore, ethylene waste lye is a typical strong alkaline, high-salt , Petrochemical wastewater with high COD. [0003] For the treatment of ethylene waste lye, the currently commonly used process is: first, wet ethylene waste lye is oxidized, desulfurized and deodorized, and then mixe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 赵桂瑜赵璞孙杰曹宗仑
Owner CHINA PETROLEUM & CHEM CORP
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