Method for removing chlorohydrocarbons in water through chemical oxidation
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A technology for chemical oxidation and chlorinated hydrocarbons, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve problems such as high cost of microbial degradation, poor treatment effect of chlorinated hydrocarbons, harsh application conditions, etc. Achieve the effect of low price, simple and easy operation, and little influence of temperature
Inactive Publication Date: 2013-03-06
EAST CHINA UNIV OF SCI & TECH
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However, this technology also has limitations: the selected microorganisms sometimes need specific domestication; the toxicity of pollutants sometimes inhibits the activity of microorganisms; the cost of microbial degradation is too high and requires continuous monitoring and maintenance
Existing advanced oxidation technologies include wet air oxidation technology, supercritical wat
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Embodiment 1
[0026] In the TCE solution with an initial concentration of 20mg / L, add 80.0mg SPC and 285.0mg FeSO in sequence 4 ·7H 2 O, carry out slow stirring, make reaction temperature be controlled at 40 ℃ by circulating water simultaneously, reaction time 60min, carry out sampling extraction at 2,5,10,20,40,60 minutes respectively, then analyze TCE concentration with gas chromatograph, the result The removal rate of TCE treated by the process of the invention reaches 99.9% in about 2 minutes.
Embodiment 2
[0028] In the TCE solution with an initial concentration of 10 mg / L, add 40.0 mg SPC and 142.5 mg FeSO in sequence 4 ·7H 2 O, carry out slow stirring, make reaction temperature be controlled at 20 ℃ by circulating water simultaneously, reaction time 60min, carry out sampling extraction respectively in 2, 5, 10, 20, 40, 60 minutes, then analyze TCE concentration with gas chromatograph, the result The removal rate of TCE treated by the process of the invention reaches 99.9% in about 5 minutes.
Embodiment 3
[0030] In the TCE solution with an initial concentration of 40mg / L, add 160.0mg SPC and 570.0mgFeSO in sequence 4 ·7H 2 O, carry out slow stirring, make reaction temperature be controlled at 20 ℃ by circulating water simultaneously, reaction time 60min, carry out sampling extraction respectively in 2, 5, 10, 20, 40, 60 minutes, then analyze TCE concentration with gas chromatograph, the result The removal rate of TCE treated by the process of the invention reaches 99% in about 5 minutes.
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Abstract
The invention relates to a method for removing chlorohydrocarbons in water through chemical oxidation, and belongs to the technical field of environmental treatment. Several chlorohydrocarbon pollutants existing in underground water are removed through the oxidation effect of sodium percarbonate (Na2CO3.1.5H2O2, SPC). The method is characterized in that the chlorohydrocarbons are treated in the presence of the SPC in the treatment process; and Fe<2+> is simultaneously added to activate the SPC which is an oxidant in order to accelerate the chemical oxidation process. The method has the advantages of simplicity, easy implementation and substantial effect; sodium percarbonate which is used as a green oxidant has an extremely-strong oxidation capability; the removal efficiencies of the chlorohydrocarbons are high, and the trichloro ethylene removal rate reaches 99.9%; and the chlorine removal speed of the method is fast, trichloro ethylene can be completely removed within 5min, and the method also has the advantages of no accumulation of intermediates, no secondary pollution and low cost.
Description
【Technical field】 [0001] The invention relates to the technical field of water treatment, in particular to a method for chemically oxidizing and removing chlorinated hydrocarbons 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 solvents such as tetrachlorethylene, trichlorethylene, and chloroform, which are widely used in modern industries such as degreasing and dry cleaning, have been frequently detected in groundwater around the world, and have become the main source of groundwater pollution. Most of the "three-to-one" effects have been listed as toxic and harmful organic pollutants for priority control by various countries. Therefore, the research on the treatment of chlorinated organic pollutants is of great significance. After several years of hard work, Chinese scientists have achieved...
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