土壤类型及组分对热活化过硫酸盐氧化降解土壤中挥发性氯代烃的影响

doi:10.13278/j.cnki.jjuese.20170240

Abstract

Abstract: This study focused on the thermally activated persulfate oxidation of the volatile chlorinated hydrocarbon (TCE, TCA, cis-1,2-DCE and 1,2-DCA) in the different soil media,sandy soil and clayey soil, and the interaction between persulfate and the two soil media in oxidation reaction was investigated to determine the contribution of organic and inorganic matter to the persulfate consumption in the soil system, which would provide an important theoretical basis and empirical guide for a successful design of ISCO technology in soil remediation. The results showed good degradation rates of 1,2-DCA, cis-1,2-DCE, TCA, and TCE by thermally activated persulfate oxidation in the both soil systems at 50℃. The degradation rates of the four chlorinated hydrocarbons in sandy soil were 25%, 89%, 5%, and 61% respectively; while the rates in clayey soil were 35%, 86%, 8%, and 63% respectively. The rates followed the order of cis-1,2-DCE>TCE>1,2-DCA>TCA. The rates in sandy soil were higher than those in clayey soil. In addition, the organic matter in sandy soil and clayey soil was reduced up to 81.3% and 72.6% respectively, and the iron content in sandy soil and clayey soil was reduced up to 80.5% and 38.6% respectively. This further indicated that a redox reaction occurred between persulfate and the soil composition, leading to a large amount of persulfate consumption. Herein, organic matter, iron and other inorganic matter in the soil media were involved in the persulfate consumption, and there was a competitive relationship among organic, iron and the four chlorinated hydrocarbons for the consumption of persulfate. Thus, too much persulfate was consumed by the soil component, resulting in a relatively low degradation rate of the four chlorinated hydrocarbons. Therefore, during the actual implementation, the dosage of persulfate should be much higher than the stoichiometric amount in the on-site remediation for the chlorinated hydrocarbons contaminated field sites by the thermally activated persulfate.

Key words: persulfate radical, thermal activation, chlorinated ethenes, chlorinated ethanes, organic content, mineral content

CLC Number:

Zhang Fengjun, Liu Zhehua, Su Xiaosi, Lü Cong, Liu Jialu. Effects of Soil Types and Composition on Oxidative Degradation of Volatile Chlorinated Hydrocarbons by Thermally Activated Persulfate[J].Journal of Jilin University(Earth Science Edition), 2018, 48(4): 1212-1220.

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Effects of Soil Types and Composition on Oxidative Degradation of Volatile Chlorinated Hydrocarbons by Thermally Activated Persulfate

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