Composite dechlorination agent for removing high-concentration chlorine-containing wastewater and application method thereof

An application method and chlorine removal technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low operating cost, complicated operation, and low equipment investment, and achieve low operating cost and high use Convenience and easy operation

Inactive Publication Date: 2012-05-23
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are several methods for removing high-concentration chloride ions in wastewater: (1) Precipitation method, using silver nitrate to precipitate chloride ions, which is too expensive in industry , is not widely used, and is limited to laboratory use; (2) Ion exchange method, using multiple beds or mixed beds to remove chloride ions, is a traditional process with low equipment investment and low operating costs, but the anion exchange resin is easily saturated. Regeneration is required; (3) Electrodialysis is suitable for treating low-concentration chlorine-containing wastewater, with high water and power consumption; (4) The removal rate of reverse osmosis (RO membrane method) is higher than that of electrodialysis, and it is easy to operate, but the investment is large. Moreover, the membrane is easy to clog, so it is no

Method used

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Examples

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Effect test

example 1

[0020] In terms of mass percentage, 15% nicotinic acid, 25% succinic acid, 20% cadmium sulfate, and 40% mercury sulfate were formulated as a compound dechlorination agent to treat chlorine in a certain chemical wastewater. The chlorine content in the wastewater was 896mg / L. During the test, take 5mL dechlorination agent and add it to chlorine-containing wastewater, stir for 15 minutes, add dichloromethane solvent, let it stand and separate after stratification, and then perform air flotation treatment on the obtained wastewater, and finally use a layer of residue floating on the surface of the wastewater with The slag scraper is scraped off, the chlorine content in the effluent water is 0.21mg / L, and the removal rate is 99.97%.

example 2

[0022] In terms of mass percentage, 40% of citric acid, 40% of β-ketoglutaric acid, and 20% of mercury sulfate are made into a compound dechlorination agent to make a compound dechlorination agent to treat chlorine in certain leather wastewater. The amount of chlorine is 521mg / L. During the test, 6mL chlorine removal agent was added to chlorine-containing wastewater, stirred for 20min, dichloromethane solvent was added, separated after standing and stratified, and the obtained wastewater was subjected to air flotation treatment, and finally the water floated in the wastewater A layer of residue on the surface was scraped off with a slag scraper, the chlorine content in the effluent was 0.19mg / L, and the removal rate was 99.96%.

example 3

[0024] In terms of mass percentage, 15% of β-ketoglutaric acid, 15% of oxaloacetic acid, 30% of cadmium sulfate, and 40% of mercury sulfate were formulated as a compound dechlorination agent to treat chlorine in a certain chemical wastewater in Changzhou City. The chlorine content is 326mg / L. During the test, take 7mL dechlorination agent and add it to the chlorine-containing wastewater, stir for 20 minutes, add dichloromethane solvent, and separate after standing and stratifying. A layer of residue on the surface of the wastewater was scraped off with a slag scraper, the chlorine content in the effluent was 0.17mg / L, and the removal rate was 99.96%.

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PUM

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Abstract

The invention discloses a composite dechlorination agent for removing high-concentration chlorine-containing wastewater and an application method thereof, which belong to the field of sewage treatment in environment protection. The composite dechlorination agent is prepared by compounding organic acids and inorganic salts, wherein the organic acids include two or more than two of nicotinic acid, citric acid, succinic acid, beta-ketoglutaric acid, and ketosuccinic acid; the inorganic salts include one or two of mercury sulfate, cadmium sulfate and copper sulfate; and the weight percentages of the organic acids and inorganic salts are 15-80% and 20-85% respectively. The application method comprises the steps of: adding the prepared composite dechlorination agent in percentage by weight of 0.05-0.5% into the high-concentration chlorine-containing wastewater and continuously stirring for 10-30min; adding a methylene dichloride solvent; standing for layering, separating, and subjecting obtained wastewater to air flotation treatment; and finally scraping off a layer of residue floating on the surface of the wastewater by a residue scraping machine to obtain the dechlorinated wastewater as the yielding water, wherein the dechlorinated wastewater can be lower than the national emission standard I. The composite dechlorination agent and the application method disclosed by the invention have the characteristics of simple technological process, smaller dosage of chemical agent, lower running expense, no sludge, high removal rate of chlorine ions in the wastewater, and the like; and the removal rate of chlorine ions in the wastewater can reach above 99.9%.

Description

technical field [0001] The invention relates to a compound dechlorination agent for removing high-concentration chlorine-containing waste water and an application method thereof, relates to the removal of chloride ions in waste water, and belongs to the field of waste water treatment in environmental protection. Background technique [0002] In industrial reverse osmosis treatment process, oil recovery process, printing and dyeing process, some high-concentration chlorine-containing wastewater with a chloride ion content greater than 1000 mg / L is often produced. Excessive chlorine ion content in wastewater will damage the water quality and inhibit the growth of microorganisms. Chlorine will chemically react with organic matter in the water to generate a series of chlorinated hydrocarbons, which will cause cancer to a certain extent on the human body. Therefore, high concentrations of chlorine The treatment of wastewater plays an extremely important role in environmental gove...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F101/12
Inventor 雷春生雷思宇范璐璐
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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