过硫酸盐氧化地下水中BTEX效果及水化学响应  

Effects of Persulfate to Oxidize BTEX in Groundwater and Hydrochemical Responses

作　　者：吴圣华 陈余道[1] 韦延梅 孟伟 WU Shenghua;CHEN Yudao;WEI Yanmei;MENG Wei(Department 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：《环境科学与技术》2019年第6期76-81,共6页Environmental Science & Technology

基　　金：国家自然科学基金(41172229,41362012)

摘　　要：过硫酸盐(S2O82-)在修复地下水有机污染方面得到广泛应用。为揭示过硫酸盐氧化处理汽油BTEX污染地下水的效果及其向生物降解转化的特征,以过硫酸钠为氧化剂,建立含水箱柱系统模拟场地汽油BTEX污染地下水的原位化学氧化修复。结果表明,含水层中内在生物作用对高浓度BTEX的降解作用不理想;过硫酸盐对处理地下水BTEX污染有一定的效果,当PS/BTEX(摩尔比)=20时,氧化效果明显,其中苯浓度的衰减系数最大,能使难生物降解的苯优先去除。pH、ORP值、NO3-等水化学指标的改变能反映化学氧化作用向生物降解作用转化,是比较理想的过渡特征指标。Persulfate(S2 O82-)was widely used in the remediation of organic contaminated groundwater.In order to reveal the effect of persulfate oxidation treatment on fuel contaminated groundwater and the transitional features of oxidation to biodegradation,a system of aquifer sand box and column was developed for in situ remediation of fuel contaminated groundwater,using persulfate as the oxidant.The experimental results indicated that the biodegradation of high concentration BTEX in aquifer was not ideal,and the persulfate worked well in treating BTEX contaminated groundwater.When PS/BTEX in molar ratio of 20,the experimental result was the best,and the attenuation coefficient of benzene concentration was the largest,which made the benzene which was difficult to biodegrade preferentially removed.The pH,ORP,NO3-and other hydrochemistry indexes could reflect the conversion oxidation to biodegradation,which were ideal transition indicators.

关 键 词：含水箱柱系统 过硫酸钠氧化 BTEX 生物降解 转化特征 

分 类 号：X523[环境科学与工程—环境工程]