不同氧化剂氧化降解土壤中的苯系物  

Study on degradation of volatile benzenes in soil by different oxidants

作　　者：杜雪霏 谢晴[2] 荣泽明 DU Xuefei;XIE Qing;RONG Zeming(School of Chemical Engineering,Dalian University of Technology,Dalian,116024,China;School of Environmental Science and Technology,Dalian University of Technology,Dalian,116024,China)

机构地区：[1]大连理工大学化工学院,大连116024 [2]大连理工大学环境学院,大连116024

出　　处：《环境化学》2023年第5期1492-1501,共10页Environmental Chemistry

基　　金：国家重点研发计划项目(2019YFC1803800)资助.

摘　　要：化学氧化修复技术是处理土壤中有机污染物的一种有效方法,但在施工过程中,氧化剂添加往往过量很多,造成氧化剂浪费,且多余氧化剂还会破坏土层结构及有机质含量.目前采用化学氧化法处理苯系物大多针对于地下水环境,面对复杂工况时的土壤苯系物污染,氧化处理缺少相应的系统数据支持.据此,本研究采用正交实验的方法研究了活化过硫酸钠、高锰酸钾、过氧化氢、Fenton试剂和类Fenton试剂氧化不同苯系物的最佳条件和显著影响因素.结果表明,氧化时间是对降解率影响较大的因素,但是降解不同苯系物所采用的氧化剂、氧化条件及显著影响因素有所不同.整体来看,苯系物中乙苯和二甲苯比较容易被氧化;对于氧化剂来说,过氧化氢、高锰酸钾和过硫酸钠氧化效果更好.研究结果可为实际工程上处理不同种类、不同浓度及不同比例的苯系物时,在氧化剂的选择以及氧化剂、活化剂、络合剂的浓度和反应时间等参数设置上提供基础数据支持.Chemical oxidation technology is regarded to be an effective method for the oxidative degradation of organic pollutants in soil remediation.However,excessive amounts of oxidants tend to be employed in the process of operation,which resulting in the waste of oxidant,also destroying the layer structure of soil and its content of organic compound due to the residual oxidant.At present,chemical oxidation technology is mainly used in the degradation treatment of benzene,toluene,ethylbenzene,o-xylene and p-xylene(BTEX)in groundwater environment,but less research is carried out in soil environment.Therefore,chemical oxidative degradation of BTEX in soil was systematacially studied in this thesis.The optimum conditions and significant influencing factors for BTEX degradation were investigated with sodium persulfate,potassium permanganate,hydrogen peroxide,Fenton reagent and Fenton-like reagent as oxidants through orthogonal experiments method.The results showed that the oxidation time had a great influence on the degradation rate,but the effect seems to be different for the degradation of different BTEX compounds if it wholly taking into account of the oxidants,oxidation conditions and significant influencing factors.On the whole,ethylbenzene and xylene in BTEX are founded to be easier being oxidized.As for oxidizing agents,hydrogen peroxide,potassium permanganate and sodium persulfate are discovered to show better oxidation performance.In general,the research can provide basic data supporting for the selection of oxidants,activators and complexing agents and the reaction condition when it dealing with BTEX pollutants with different types,concentrations and proportions in soil remediation.

关 键 词：苯系物 过硫酸钠 高锰酸钾 过氧化氢 FENTON试剂 类FENTON试剂 

分 类 号：X53[环境科学与工程—环境工程]