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Method for removing chloro-olefin in water through strengthening activating calcium peroxide

A chlorinated olefin and calcium peroxide technology, which is applied in chemical instruments and methods, oxidized water/sewage treatment, special compound water treatment, etc. Strong oxidizing power

Inactive Publication Date: 2015-06-10
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Similar to the Fenton reaction, Fe 2+ In order to effectively activate CaO 2 One of the means, but CaO 2 with Fe 2+ The reaction is very rapid, resulting in the reduction of the influence radius of the oxidant in the ground, and the CaO 2 with Fe 2+ The optimal pH value of the reaction is between 2 and 4. When using in situ, a large amount of acid solution needs to be added to maintain the pH value of the solution, which is easy to damage the ecosystem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In the 250mL aqueous solution whose initial concentration of trichlorethylene (TCE) is 20mg / L, add 14.6mg CaO 2 , 60.8mg Fe 2 (SO 4 ) 3 and 16.0 mg of citric acid, fully stirred during the chemical oxidation process, while the reaction temperature was controlled at 18°C, and the reaction time was 90 minutes. Sampling and extraction were carried out at 5, 10, 20, 30, 60, and 90 minutes respectively, and then the samples were analyzed by gas chromatography. TCE concentration, as a result, the removal rate of TCE treated by the technology of the present invention reaches 99.9% after 90 minutes.

Embodiment 2

[0026] In the 250mL aqueous solution whose initial concentration of trichlorethylene (TCE) is 20mg / L, add 14.6mg CaO 2 , 60.8mg Fe 2 (SO 4 ) 3 and 32.0mg of citric acid, fully stirred during the chemical oxidation process, while the reaction temperature was controlled at 18°C, and the reaction time was 90min. Sampling and extraction were carried out at 5, 10, 20, 30, 60, and 90min respectively, and then the samples were analyzed by gas chromatography. TCE concentration, as a result, the removal rate of TCE treated by the technology of the present invention reaches 99% after 90min.

Embodiment 3

[0028] In the 250mL aqueous solution whose initial concentration of trichlorethylene (TCE) is 20mg / L, add 29.3mg CaO successively 2 , 60.8mg Fe 2 (SO 4 ) 3 and 16.0 mg of citric acid, fully stirred during the chemical oxidation process, while the reaction temperature was controlled at 18°C, and the reaction time was 90 minutes. Sampling and extraction were carried out at 5, 10, 20, 30, 60, and 90 minutes respectively, and then the samples were analyzed by gas chromatography. TCE concentration, as a result, the removal rate of TCE treated by the technology of the present invention reaches 99.9% after 60 minutes.

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Abstract

The invention relates to a method for removing chloro-olefin in water through strengthening activating calcium peroxide, for removing the chloro-olefin contaminant existed in the underground water by using the oxidation of the calcium peroxide (CaO2), and belongs to the technical field of environmental management. In the treating process, in the existence of the calcium peroxide, the ferric ion is added for activating the oxidizing agent, the citric acid is added for reinforcing the activation effect and then the chloro-olefin contaminant is oxidized. The method has the advantages that the calcium peroxide is used as a novel green oxidizing agent and has the characteristics of strong oxidizing ability, high stability and long oxidizing effect; by adopting the ferric ion and the citric acid, the calcium peroxide can be continuously and effectively activated and the timeliness of the oxidation can be increased; the pollution of the underground water caused by the chloro-olefin can be effectively green repaired and treated without intermediate product accumulation or secondary pollution.

Description

【Technical field】 [0001] The invention relates to the technical field of water treatment, in particular to a method for strengthening activated calcium peroxide to remove chlorinated olefins in water. 【Background technique】 [0002] Groundwater is one of the most important freshwater resources on Earth. With the rapid development of industry and agriculture, more and more groundwater is polluted. Chlorinated hydrocarbon organic solvents such as trichlorethylene, tetrachlorethylene, and chloroform, which are widely used in modern industries such as degreasing and dry cleaning, are frequently detected in groundwater around the world and have become the main source of groundwater pollution. And because of its "three effects" effect, most of them have been listed as the priority control of toxic and harmful pollutants by various countries. In view of the widespread pollution of chlorinated hydrocarbons in the underground environment and the strong hazards of chlorinated hydroc...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/36C02F103/06
CPCC02F1/722C02F2101/36C02F2103/06C02F2305/02
Inventor 吕树光顾小钢邱兆富隋倩张祥傅晓日缪周伟徐旻辉薛云飞王琰涤
Owner EAST CHINA UNIV OF SCI & TECH
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