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Method of dechlorinating organic chloride with metal enhanced by cationic surface active agent

A technology of surfactants and organic chlorides, which is applied in the field of organic chlorides in metal reduction wastewater enhanced by cationic surfactants, can solve the problem of complex preparation of binary metal or multimetal reducing agents and catalysts, low efficiency of organic chloride treatment, Engineering application conditions are harsh and other problems, to achieve the effect of simple and easy loading method, low cost of wastewater treatment, and simple wastewater treatment device

Inactive Publication Date: 2007-02-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] (1) When using single metal as reducing agent, the treatment efficiency is low for low-concentration organic chlorides, and the treatment time is long;
[0021] (2) Pd, the most effective catalyst among currently used transition metal catalysts, is too expensive;
[0022] (3) The preparation of binary metal or multimetal reducing agents and catalysts is complicated, and the engineering application conditions are harsh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The reducing agent is iron (powder) impregnated in the concentration 0.9mmol / L cetyltrimethylammonium bromide solution for 1 hour and taken out to obtain the iron powder loaded by the cationic surfactant. The concentration of carbon chloride is 20mg / L, the pH is 7, the residence time is 60min, and the concentration of carbon tetrachloride in the treated water is 4mg / L.

Embodiment 2

[0049]The reducing agent is iron (powder) impregnated in the concentration 3.0mmol / L tetradecyltrimethylammonium bromide solution and taken out after 1 hour to obtain the iron powder loaded by the cationic surfactant. The concentration is 50mg / L, the pH is 4, the residence time is 48min, and the chloroform in the treated water is 8mg / L.

Embodiment 3

[0051] The reducing agent is iron (powder) impregnated in the concentration 0.6mmol / L cetylpyridinium bromide solution for 1 hour and taken out to obtain the iron powder loaded by the cationic surfactant. The concentration is 20mg / L, the pH is 3.5, the residence time is 190min, and the hexachloroethane in the treated water is 2mg / L.

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Abstract

The invention disclosed a cationic surfactant reinforced metal reduction method for dechlorination of organic chlorides. Said method includes impregnating the metal reductant in the cationic surfactant solution at least one hour, and then adding the metal reductant and organic chlorides-bearing water to be treated into a reactor and carrying out a reaction, wherein the cationic surfactant concentration is the critical micelle concentration. The invention method uses zero-valent metal as the reductant, which is cheap and easy to get, and has no secondary pollution or heavy-metal contamination, and no adverse effect to wastewater treatment. The method has the advantages of simplicity and low cost, and can be operated at room temperature and atmospheric pressure. The conditions for wastewater treatment process are mild. The treating device is simple, easy, and stable.

Description

technical field [0001] The invention relates to the technical field of water pollution control and treatment, in particular to a method for cationic surfactants to enhance metal reduction of organic chlorides in wastewater. Background technique [0002] Organic chlorides include chlorinated aliphatic hydrocarbons, chlorinated aromatic hydrocarbons and other chlorine-containing organic compounds, and organic chlorides are widely used in industry. Chlorine-containing organic substances frequently used in industry mainly include methyl chloride, vinyl chloride, ethyl chloride, etc., which are often used as solvents for degreasing, cleaning, and extraction due to their high solubility, low flammability, low explosion, and chemical safety. Herbicides and insecticides used in agriculture are all organic chlorides, such as chlorophenols and chlorobenzenes. In this way, with the development of the chemical industry, organic chlorides and their intermediate products are discharged i...

Claims

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Application Information

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IPC IPC(8): C02F1/70
Inventor 官宝红孟亚锋吴忠标赵伟荣刘越
Owner ZHEJIANG UNIV
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