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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

Inactive Publication Date: 2005-02-09
SHANGHAI CAC CHEM
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  • Application Information

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Problems solved by technology

At present, in China, most of the chlor-alkali oxidation methods are used. This method not only costs a lot, but also increases the salt content in the wastewater after treatment, which cannot enter the biochemical treatment system, causing difficulties for further treatment.
[0004] At present, there are also people who use pressurized hydrolysis to treat waste water. This method is an effective method for removing cyanide radicals. However, for paraquat cyanide-containing waste water, the removal rate of COD is required to reach about 90%, and the purple-black opaque shape is required. Purple-black substance, toxic to the biological strains in the biochemical pool) transforms into a transparent light yellow liquid, and the conventional pressurized hydrolysis method is powerless

Method used

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  • Paraquat waste water containing cyanogen treating method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 500 milliliter autoclave equipped with a thermometer, agitator, gas mass flow meter, and tail gas absorption system, add 300 grams of paraquat cyanide-containing wastewater stock solution (CN - 6000mg / l, COD 30,000mg / l), then drop into catalyst 10 grams, described catalyzer is carrier with activated carbon, and then attaches metal composite element, and described metal composite element is one of platinum, cerium, cobalt three kinds of elements Specifically, granular activated carbon is used as a catalyst, and the above-mentioned metal salt solution is coated on the activated carbon by impregnation method, and then roasted, and then the kettle is covered, stirred and heated to 130 °C, and opened. Air is introduced into the air valve to make the pressure reach 1.3Mpa, then the tail gas valve is opened to discharge a small amount of gas, and the air inlet valve is adjusted to keep the pressure in the kettle at 1.3Mpa. In this way, keep a constant temperature of 130°C...

Embodiment 2-6

[0025] The operation method is the same as that in Example 1, and the catalyst used in each batch is the same as in the previous example, and a new catalyst is added until the weight of the catalyst is 10 grams. Result is identical with embodiment 1, sees following table 1:

[0026] batch number

Embodiment 7

[0028] The operation method is the same as in Example 1, but 150 grams of waste water stock solution is added, and 150 grams of water is added; the reaction time is 18 hours. The result was the same as in Example 1.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/00C02F1/72C02F1/74
Inventor 郑留清宋志庆
Owner SHANGHAI CAC CHEM
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