Deep treatment method of ethylene waste lye

A technology for ethylene waste lye and advanced treatment, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Deterioration of the effect and other problems, to achieve the effect of reducing the load of biochemical treatment, improving the quality of the effluent, and achieving a good decolorization effect

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The following problems exist in the process of mixed treatment of ethylene waste lye and other sewage: (1) The salt content in ethylene waste lye is very high, and the treated effluent cannot be reused
(2) Due to the high content of organic pollutants and inorganic salts (mainly sulfate) in ethylene waste lye, it often impacts the downstream sewage treatment plants, resulting in deterioration of the treatment effect and causing the external discharge to exceed the standard
In addition, after the waste lye is treated with the above-mentioned patented technology, the chroma of the effluent is still relatively high
[0012] It can be seen that no effective treatment process has been formed at present, which can significantly reduce the content and chroma of organic pollutants in the wastewater, thereby reducing the load and difficulty of subsequent treatment, and improving the quality of effluent water

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] The water quality characteristics of the ethylene waste lye after wet oxidation pretreatment in an ethylene workshop are as follows, COD: 3960mg / L, chroma: 200, pH value: 12.4, conductivity: 41700us / cm, total dissolved solids: 34850mg / L , SO 4 2- , S 2 o 3 2- and SO 3 2- Total amount: 14537.2mg / L. The processing method is as follows:

[0038] (1) First, add acid to the ethylene waste lye after wet oxidation pretreatment, adjust the pH value of the wastewater to 3.0, and the acid is sulfuric acid; secondly, raise the temperature of the wastewater to 30°C, and add ferrous sulfate (FeSO 4 ·7H 2 O) and hydrogen peroxide (H 2 o 2 ), stirred mechanically for 4h to complete the reaction; among them, H 2 o 2 / Fe 2+ The molar ratio of H is 10.0, H 2 o 2 The mass ratio of / COD was 3.0.

[0039] (2) Add sodium hydroxide solution to the ethylene waste lye after Fenton oxidation treatment, adjust the pH value to 8.5, and carry out precipitation treatment to realize ...

Embodiment 2

[0045] The water quality characteristics of the ethylene waste lye after wet oxidation pretreatment in an ethylene workshop are as follows, COD: 3717mg / L, chroma: 150, pH value: 13.1, conductivity: 38300us / cm, total dissolved solids: 32750mg / L , SO 4 2- , S 2 o 3 2- and SO 3 2- Total amount: 7607.8mg / L. The processing method is as follows:

[0046] (1) First, add an acid to the ethylene waste lye after wet oxidation pretreatment to adjust the pH value to 3.5, and the acid is sulfuric acid. Next, raise the temperature of the wastewater to 35°C, add ferrous sulfate (FeSO 4 ·7H 2 O) and hydrogen peroxide (H 2 o 2 ), stirred mechanically for 3h to complete the reaction; among them, H 2 o 2 / Fe 2+ The molar ratio of H is 15.0, H 2 o 2 The mass ratio of / COD was 4.0.

[0047] (2) Add sodium hydroxide solution to the ethylene waste lye after Fenton oxidation treatment, adjust the pH value to 9.0, and carry out precipitation treatment to realize solid-liquid separati...

Embodiment 3

[0053] The water quality characteristics of ethylene waste lye after wet oxidation pretreatment in an ethylene workshop are as follows: COD: 3474mg / L, chroma: 100, pH value: 13.4, conductivity: 37200us / cm, total dissolved solids: 37550mg / L , SO 4 2- , S 2 o 3 2- and SO 3 2- Total amount: 12186.9mg / L. The processing method is as follows:

[0054] (1) First, add an acid to the ethylene waste lye after wet oxidation pretreatment to adjust the pH value to 4.0, and the acid is sulfuric acid. Next, raise the temperature of the wastewater to 40°C, add ferrous sulfate (FeSO 4 ·7H 2 O) and hydrogen peroxide (H 2 o 2 ), stirred mechanically for 2h to complete the reaction; among them, H 2 o 2 / Fe 2+ The molar ratio of H is 10.0, H 2 o 2 The mass ratio of / COD was 2.5.

[0055] (2) Add sodium hydroxide solution to the ethylene waste lye after Fenton oxidation treatment, adjust the pH value to 9.5, and carry out precipitation treatment to realize solid-liquid separation....

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Abstract

The invention relates to a deep treatment method of ethylene waste lye, and particularly relates to a deep treatment method of ethylene waste lye after wet oxidation pretreatment. The ethylene waste lye after wet oxidation pretreatment is deeply treated by adopting a Fenton oxidation-biological aerated filter (BAF) technology, the chemical oxygen demand (COD) of effluent after treatment is smaller than 200mg/L, the chromaticity is smaller than 1, the ethylene waste lye is clear and transparent, and deep treatment of the ethylene waste lye is achieved. The treatment method is simple and convenient in operation, stable to run, high in COD removal efficiency, and good in decoloration effect, and can be directly discharged to a municipal sewage plant and receiving water or merged into other treatment systems.

Description

technical field [0001] The invention relates to an advanced treatment method for ethylene waste lye, in particular to an advanced treatment method for ethylene waste 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 treated by alkali washing. Its characteristics are: strong alkalinity, high concentration of organic matter such as sulfide and butter, poisonous, foul smell and deep color, it is a typical high-concentration refractory organic wastewater. [0003] For the pretreatment of ethylene waste lye, the wet oxidation process is generally used at present. Including high temperature and high pressure wet oxidation process and low temperature and low pressure wet oxidation process. In view of the relatively high investment and operating costs of the high temperature and high pressure wet oxidation process, the low temperature and low pressure w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 赵桂瑜马兰兰孙杰赵璞王道泉
Owner CHINA PETROLEUM & CHEM CORP
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