几种含水介质中过硫酸钠去除苯系物/乙醇的效果和影响  

Effects of sodium persulfate on benzene series/ethanol removal in several aquifer media

作　　者：孟伟 蒋亚萍[1] 陈余道[1] 吴圣华 韦延梅 韦俊宏 MENG Wei;JIANG Yaping;CHEN Yudao;WU Shenghua;WEI Yanmei;WEI Junhong(Institute of Environmental Science and Engineering,Guilin University of Technology,Guilin,541006,China)

机构地区：[1]桂林理工大学环境科学与工程学院

出　　处：《环境化学》2019年第10期2187-2194,共8页Environmental Chemistry

基　　金：国家自然科学基金(41172229,41362012)资助~~

摘　　要：为探究含水介质中过硫酸钠去除乙醇汽油主要组分苯系物(苯、甲苯、乙苯和二甲苯简称BTEX)和乙醇的效果,选用石灰土、玄武岩风化土、花岗岩风化土、白云石、河砂等5种不同特性的介质,在室温下开展批实验研究.结果表明,在自然条件下,乙醇的降解速率由大到小顺序为玄武岩风化土>石灰土>河砂>花岗岩风化土>白云石,乙醇容易被微生物降解且会阻碍BTEX的微生物降解;在单纯的化学氧化条件(灭菌)下,BTEX比乙醇更容易被过硫酸钠氧化去除.其中,石灰土和玄武岩风化土BTEX去除率分别为94.2%和97.6%,乙醇去除率分别为16.9%和37.0%;河砂、花岗岩风化土及白云石BTEX的去除率均大于99%,乙醇去除率在67.4%—73.6%之间.在未灭菌条件下,过硫酸钠化学氧化显著抑制玄武岩风化、花岗岩风化土、河砂中固有的微生物作用,但对石灰土介质的影响较小.介质固有的有机质以及过硫酸钠引起的pH降低,都会影响过硫酸钠对污染物的去除,而介质中铁氧化物的作用需要进一步评价.In order to explore the effects of sodium persulfate on removal of benzene series(benzene,toluene,ethylbenzene and xylene are abbreviated as BTEX)and ethanol from groundwater contaminated by ethanol blended gasoline,a batch experiment was carried out at room temperature by using five kinds of media including lime soil,basalt weathered soil,granite weathered soil,dolomite and river sand.The results showed that the order of removal rates of ethanol was basalt weathered soil>lime soil>river sand>granite weathered soil>dolomite under natural condition.Ethanol was easy to be biodegraded and could hinder the biodegradation of BTEX.Under pure chemical oxidation condition(sterilized),BTEX was more easily to be removed by chemical oxidation than ethanol.Among them,the removal rates of BTEX in lime soil and basalt weathered soil were 94.2% and 97.6%,respectively,and the removal rates of ethanol were 16.9%and 37.0%,respectively.The removal rates of BTEX in river sand,granite weathered soil and dolomite were all over 99%,and the removal rates of ethanol were ranged from 16.9%to 73.6%.Under unsterilized condition,sodium persulfate significantly inhibited the intrinsic microbial action in basalt weathered soil,granite weathered soil and river sand,but had a little influence on lime soil medium.The inherent organic matter and the decrease of pH can affect the BTEX and ethanol removal in persulfate chemical oxidation,whereas the role of iron oxides contained in medium needs further evaluation.

关 键 词：BTEX/乙醇 过硫酸钠 含水介质 化学氧化 

分 类 号：X52[环境科学与工程—环境工程]