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Antichloration of hydrocarbon chloride in waste water

A chlorinated hydrocarbon and dechlorination technology, which is applied in chemical instruments and methods, water pollutants, neutralized water/sewage treatment, etc., can solve the problems of secondary pollution and high cost of sewage treatment, and achieve the effect of high-efficiency dechlorination

Inactive Publication Date: 2007-11-21
ZHEJIANG QUHUA FLUOR CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, palladium is both a precious metal and a heavy metal, and palladium plating requires a special process, which leads to high sewage treatment costs and may cause secondary pollution

Method used

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  • Antichloration of hydrocarbon chloride in waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dechlorination agent: cast iron powder, particle size 100 mesh, dosage is 2-3kg per ton of water;

[0022] Dechlorination reaction operating conditions: normal temperature and pressure, pH 2.8, stirring, reaction residence time 4 hours;

[0023] Neutralizing flocculant: NaOH;

[0024] Neutralization and dechlorination operating conditions: normal temperature and pressure, PH 8.6;

[0025] Influent concentration: dichloromethane 20mg / L, chloroform 30mg / L, carbon tetrachloride 30mg / L

[0026] Treatment effluent concentration: dichloromethane 1.4mg / L, chloroform 1.9mg / L, carbon tetrachloride 0.9mg / L

Embodiment 2

[0028] Dechlorination agent: cast iron powder, particle size 80 mesh, dosage is 2-3kg per ton of water;

[0029] Dechlorination reaction operating conditions: normal temperature and pressure, pH 3.2, stirring, reaction residence time 3.5 hours;

[0030] Neutralizing flocculant: carbide slag;

[0031] Neutralization and dechlorination operating conditions: normal temperature and pressure, PH 7.8;

[0032] Influent concentration: dichloromethane 20mg / L, chloroform 30mg / L, carbon tetrachloride 30mg / L

[0033] Treatment effluent concentration: dichloromethane 1.6mg / L, chloroform 1.8mg / L, carbon tetrachloride 1.2mg / L

Embodiment 3

[0035] Dechlorination agent: cast iron powder, particle size 40-60 mesh, dosage 2-3kg per ton of water;

[0036] Dechlorination reaction operating conditions: normal temperature and pressure, pH 1.9, stirring, reaction residence time 4 hours;

[0037] Neutralizing flocculant: carbide slag;

[0038] Neutralization and dechlorination operating conditions: normal temperature and pressure, PH 8.2;

[0039] Influent concentration: tetrachlorethylene 50mg / L

[0040] Treatment effluent concentration: tetrachlorethylene 2.2mg / L

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Abstract

De-chlorination for chloro-hydrocarbon in industrial waste water is carried out by taking cast-iron powder or ferric-carbon alloy as antichlor, putting antichlor into reactor containing chloro-hydrocarbon industrial waste water, regulating reactive mixture pH between 1-5, reacting fully above 3 hrs at normal temperature and pressure, entering reacted waste water into neutralization pool, adding into base while neutralizing, flocculating while depositing, anti-chlorinating and discharging. The chloro-hydrocarbon to be treated includes methylene chloride, chloroform, carbon tetrachloride, vinyl chloride, tri-chloroethylene, carbon dichloride, chloro-fatty hydrocarbon and chloro-aryl radical.

Description

technical field [0001] The invention relates to a method for dechlorination of chlorinated hydrocarbons in waste water. Background technique [0002] Chlorinated hydrocarbons refer to compounds in which hydrogen atoms in hydrocarbon molecules are replaced by chlorine atoms. It is an important class of compounds that rarely exist in nature, and most of them are artificially synthesized. Since the carbon-chloride bond (C-Cl) is polar, chlorinated hydrocarbons are relatively active in nature and can undergo various chemical reactions to generate various important organic compounds. Therefore, chlorinated hydrocarbons play a bridge role in organic synthesis and are called Widely used in chemical industry, metal parts, laundry industry, pharmaceutical industry, etc. [0003] Common chlorinated hydrocarbon pollutants in wastewater mainly include: dichloromethane, chloroform, carbon tetrachloride, chloroethylene, trichloroethylene, tetrachloroethylene, chlo...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F1/66C02F1/52C02F101/36
Inventor 汤月明陈科峰韩建勋贺爱国
Owner ZHEJIANG QUHUA FLUOR CHEM
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