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Method and device for treating organic cyanide wastewater

A treatment method and treatment device technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as high cost, equipment corrosion, and highly toxic cyanide, and achieve Effects of preventing highly toxic hydrogen cyanide gas, reducing biological toxicity, and simple operating conditions

Inactive Publication Date: 2012-08-22
SHANGHAI CHEM IND PARK SINO FRENCH WATERDEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cyanide is widely used in paint, rubber, medicine, dyes and other industries, and plays an irreplaceable role in the petrochemical industry. However, most of the wastewater produced by it contains high concentrations of complex organic pollutants and highly toxic cyanide. Therefore, it is necessary to seek a An efficient, economical, and environmentally friendly treatment method has always been a research direction that has attracted much attention.
[0003] At present, domestic and foreign treatment methods to this type of organic cyanide-containing wastewater mainly include 1) rectification, which utilizes the difference in the boiling point of each substance in the wastewater to achieve the purpose of separation. This method consumes a lot of energy, and generally does not Adopted
2) Activated carbon adsorption method, the treatment efficiency of this method is low, and the cost is relatively high
Chlorine dioxide method and Fenton method have severe corrosion on equipment, and there is a risk of potentially highly toxic gases cyanogen chloride and hydrogen cyanide escaping, ozone consumes a lot of electricity, and the treatment cost is high

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  • Method and device for treating organic cyanide wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The organic cyanide-containing wastewater discharged from a production facility contains a large amount of organic nitriles (3-cyanopyridine, succinonitrile, etc.), with a COD of 2963 mg / L and a cyanide concentration of 3.76 mg / L. Operating conditions: Wastewater treatment capacity is 1m3 / h, the dosage of 30% hydrogen peroxide is 50ml / min, the upper limit of pH controller 14 is set to 9, the lower limit is 8.2, the reaction residence time is controlled at 2 hours, the COD of oxidized water is 2100mg / L, and the concentration of cyanide It is 0.24mg / L. After biochemical treatment, the COD of the final effluent is 84mg / L, and the concentration of cyanide is 0.02mg / L (see Table 1).

[0037] Table 1

[0038] reaction stage

Embodiment 2

[0040] The organic cyanide-containing wastewater discharged from a production facility contains a large amount of organic nitriles (3-cyanopyridine, succinonitrile, etc.), the COD is 3215mg / L, and the cyanide concentration is 4.9mg / L. Operating conditions: Wastewater treatment capacity is 1m 3 / h, the dosage of 30% hydrogen peroxide is 45ml / min, the upper limit of pH controller 14 is set to 10, the lower limit is 9, the reaction residence time is controlled at 2 hours, the COD of oxidized water is 1865mg / L, and the concentration of cyanide It is 0.12mg / L. After biochemical treatment, the COD of the final effluent is 75mg / L, and the cyanide concentration is 0.01mg / L (see Table 2).

[0041] Table 2

[0042] reaction stage

Embodiment 3

[0044] The organic wastewater of a synthesis plant contains a certain concentration of toluene and benzaldehyde, the influent COD is 560mg / L, the cyanide concentration is 25mg / L, the pH is 10, the dosage of hydrogen peroxide is 5g / L, and the catalyst copper sulfate is Under the operating condition of 8mg / L, the reaction was carried out for 1 hour, and the cyanide in the effluent was 0.13mg / L, and the removal rate was 99.5%. After biochemical treatment, the final effluent COD is 50mg / L, and the cyanide concentration is 0.02mg / L.

[0045] In summary, the method and device for treating organic cyanide-containing wastewater of the present invention can fully meet the treatment requirements of organic cyanide-containing wastewater in the petrochemical industry, and has the following advantages:

[0046] 1. As an ideal and clean oxidant, hydrogen peroxide will not cause secondary pollution.

[0047] 2. The pH value of the reaction is controlled to be alkaline, which can effectively...

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Abstract

The invention discloses a method for treating organic cyanide wastewater. The organic cyanide wastewater is pretreated by reaction using the alkaline peroxide advanced oxidation method, and the pretreated wastewater is subjected to biological oxidation and nitrogen removal by the biological A / O (Anoxic / Oxic) process to obtain effluent water meeting the discharge standards of China and to realize effective treatment of organic cyanide wastewater. The invention further discloses a device for treating the organic cyanide wastewater. As an ideal and clean oxidant, peroxide does not cause secondary pollution, and can reduce biological toxicity of wastewater as well as improve the biodegradability of wastewater, the pH value is controlled in the alkaline range, and highly toxic cyanide gas can be effectively prevented from escaping; and in addition, the operation conditions are simple, and the operation can be carried out at normal temperature and normal pressure.

Description

technical field [0001] The invention relates to waste water treatment technology, more specifically, relates to a treatment method and device for organic cyanide-containing waste water. Background technique [0002] Cyanide is widely used in paint, rubber, medicine, dyes and other industries, and plays an irreplaceable role in the petrochemical industry. However, most of the wastewater produced by it contains high concentrations of complex organic pollutants and highly toxic cyanide. Therefore, it is necessary to seek a An efficient, economical, and environmentally friendly treatment method has always been a research direction that has attracted much attention. [0003] At present, domestic and foreign treatment methods to this type of organic cyanide-containing wastewater mainly include 1) rectification, which utilizes the difference in the boiling point of each substance in the waste water to achieve the purpose of separation. This method consumes a lot of energy, and gene...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/38
Inventor 黄仕源瞿贤康健灵王晓青毛林官许研王乔刘琴
Owner SHANGHAI CHEM IND PARK SINO FRENCH WATERDEV
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