Paraquat waste water containing cyanogen treating method

A treatment method and technology for cyanide wastewater, which are applied in the directions of oxidized water/sewage treatment, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high treatment cost, difficulty in treatment, and increase of salt content in wastewater, and reach the treatment cost. Low cost, simple process and small equipment investment
CN1576242AInactive Publication Date: 2005-02-09SHANGHAI CAC CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI CAC CHEM
Publication Date
2005-02-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention belongs to the field of waste water treating technology. The treating process of waste water containing paraquat and cyanide includes: adding the waste water and catalyst in the amount of 0.5-10 wt% of waste water into pressured reactor; stirring and heating to 100-200 dtg.c; introducing oxidant gas to control the reaction pressure in 0.5-1.8 MPa for certain time of reaction; cooling to normal temperature and filtering the reacted liquid. The catalyst of the present invention is active carbon catalyst, which may be used as carrier with certain amount of composite metal elements loaded. The cyanide containing waste water through the treatment of the present invention is further treated in a biochemical treating system. The present invention has simple treating process, less investment in apparatus and low treating cost.
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Description

technical field

[0001] The invention relates to a method for treating pesticide industrial wastewater, more particularly, the invention relates to a method for treating paraquat cyanide-containing wastewater. Background technique

[0002] In the process of producing paraquat by the cyanohydrin route, a kind of cyanide-containing wastewater will be produced. This wastewater contains high cyanide ion concentration, high chemical oxygen demand (COD), high salt content, dark and opaque color, and is not easy to oxidize, etc. characteristics, it is often difficult to completely remove them using conventional methods.

[0003] In the prior art, we found that most foreign countries use thermal oxidation furnaces to incinerate waste liquids, but the investment in equipment using this method is large. At present, in China, most of the chlor-alkali oxidation methods are used. This method not only has high treatment costs, but also increases the salt content in the wastewater after tr...

Claims

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