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Closed circulation processing technique for cyanide-containing waste water

A closed-loop, treatment process technology, used in oxidized water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as complexity, large investment, and no reports, and achieve results. excellent effect

Inactive Publication Date: 2008-05-28
甘晓明 +7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process is not only complicated, but also requires a lot of investment and high energy consumption. More importantly, some chemicals such as scale inhibitors, pH adjustment, and bactericides need to be added to the reverse osmosis process. Will affect the quality of electroplating products
So far, there have been no reports of successful engineering examples of closed-loop treatment of cyanide-containing wastewater.

Method used

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  • Closed circulation processing technique for cyanide-containing waste water

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Embodiment Construction

[0018] As shown in the process flow diagram of the present invention, the process flow for the treatment of cyanide-containing wastewater is as follows:

[0019] Gravity inflow of discharged cyanide-containing wastewater 1 # In the regulating tank, the wastewater is quantitatively pumped into the primary cyanide breaking pool by the lifting pump, and oxidant and alkaline agent are added to the pool for primary cyanide breaking, among which sodium hypochlorite is used as the oxidizing agent;

[0020] The waste water after primary cyanide breaking overflows into the secondary cyanide breaking tank, and oxidant and acid are added for secondary cyanide breaking;

[0021] Water overflow after secondary cyanide breaking into 1 # Coagulation pool, quantitatively add coagulant to coagulate;

[0022] Wastewater overflow after coagulation reaction 1 # In the flocculation tank, a flocculant is added quantitatively to make the sediment in the wastewater form a precipitable floc.

[00...

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Abstract

The invention relates to a treatment method of wastewater with cyanogen, in particular to a closed circulation treatment method of wastewater with cyanogen. The wastewater with cyanogen is first treated with cyanogen breaking by oxidation; the wastewater after reaction is then made into pure water to be reused in a zero-emission closed circulation process of the production. The process involves that the wastewater is first treated with cyanogen breaking by secondary oxidation with NaClO as oxidant so as to ensure that CN<-> is thoroughly oxidized to be N2 and CO2; coagulation sedimentation, filtration and ion exchange treatment are then followed to ensure that effluent with the electric conductivity below 10Mus after treatment is reused as the pure water and other impurities form floc units and are recycled after pressure filtration dehydration. The closed circulation treatment method of the invention is proved to have remarkable effects after verification by experiments.

Description

Technical field [0001] The invention relates to a treatment method for cyanide-containing wastewater, in particular to a closed-circuit circulation treatment process for cyanide-containing wastewater. Background technique [0002] Cyanide in cyanide-containing wastewater is a highly toxic substance. The treatment methods currently used are: acidification recovery method, solvent extraction method, ion exchange method, membrane separation method, chemical precipitation method, chlorine oxidation method, sulfur dioxide air oxidation method, sodium pyrosulfite air oxidation method, hydrogen peroxide oxidation method, ozone oxidation method, High-temperature digestion method, photochemical degradation method, biochemical method, electrolytic oxidation method, natural purification method, adsorption method, etc., such as the cyanide-containing wastewater treatment method of the announcement number CN200410022037.0, the CN - O released at the anode 2 In activated carbon and Cu ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/52C02F1/42C02F101/18
Inventor 甘晓明傅威邢绍文侯炽成张妫高亦强邱章白李文
Owner 甘晓明
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