Method and system for treating cyanide-containing wastewater at low concentration

A treatment method and a treatment system technology, applied in the field of wastewater treatment, can solve the problems of huge investment and long treatment time, and achieve the effect of preventing equipment blockage and realizing harmlessness

Active Publication Date: 2012-06-20
KMD BEIJING ENERGY & ENVIRONMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires a huge investment and takes a long time to proc...

Method used

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  • Method and system for treating cyanide-containing wastewater at low concentration
  • Method and system for treating cyanide-containing wastewater at low concentration
  • Method and system for treating cyanide-containing wastewater at low concentration

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Embodiment

[0032] The above-mentioned method and system of the present invention are adopted for the treatment of low-concentration cyanide-containing wastewater, and the total water volume designed to be treated is 1000t / d, and is designed to operate continuously 24 hours a day. The water flow rate of the membrane treatment unit is 1000m 3 / d; the water flow rate of the wet catalytic oxidation treatment unit is 41.7m 3 / h;

[0033] The test results of influent water quality and effluent water quality are shown in Table 1 and Table 2:

[0034]

[0035] Table 1 Influent water quality of low-concentration cyanide-containing wastewater (unit: mg / l; pH value is dimensionless)

[0036]

[0037] Table 2 Low-concentration cyanide-containing wastewater treatment effluent water quality (unit: mg / l; pH value is dimensionless)

[0038] The result proves that the water quality of the effluent treated by the method of the present invention has reached the secondary discharge standard stipula...

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Abstract

The invention discloses a system and a method for treating cyanide-containing wastewater at low concentration. The method mainly comprises the following steps of: pre-treating the cyanide-containing wastewater at low concentration to remove large solid pollutant particles from the cyanide-containing wastewater at low concentration; performing membrane treatment to remove most cyanide ions, treating effluent obtained after treatment by the conventional NaClO oxidation method and other methods, and then discharging effluent which reaches the standard; and performing catalytic wet oxidation on concentrated liquor produced after the membrane treatment, and discharging the treated concentrated liquor which reaches the standard. The system mainly comprises a grating, a membrane treatment system, and catalytic wet oxidation treatment equipment. The invention has the advantages that: the cyanide-containing wastewater at low concentration is subjected to membrane treatment and then is treated by the conventional NaClO oxidation method, and effluent which reaches the standard is discharged, so the treatment difficulty and cost of a discharge and treatment system are reduced; and the concentrated liquor is subjected to catalytic wet oxidation, and the effluent obtained after treatment can reach the direct discharging standard, or can be recycled as clear water.

Description

technical field [0001] The present invention relates to a treatment method for waste water, more precisely, relates to a treatment method for low-concentration cyanide-containing waste water, and also relates to a system applying the treatment method. Background technique [0002] Cyanide-containing wastewater is a kind of highly toxic industrial wastewater. It is unstable in water and easily decomposed into inorganic cyanide and organic cyanide, both of which are highly toxic substances. Human ingestion can cause acute poisoning. The lethal dose of cyanide to human body is 0.18g, potassium cyanide is 0.12g, and the lethal mass concentration of cyanide to fish in water is 0.01-0.1mg / L. Cyanide-containing wastewater mainly comes from electroplating, gas, coking, metallurgy, metal processing, chemical fiber, plastic, pesticide, chemical and other industries. The cyanide-containing wastewater produced by these industries will cause great pollution to the environment, and is a ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/18
Inventor 李国文郭春生于勇勇周加旺
Owner KMD BEIJING ENERGY & ENVIRONMENT TECH CO LTD
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