BTEX在地下环境中的自然衰减  

Natural Attenuation of BTEX in the Underground Environment

作　　者：周睿[1] 赵勇胜[1] 任何军[1] 董军[1] 胡桂全[1] 赵妍[1] 花菲[1] 

机构地区：[1]吉林大学环境与资源学院,长春130026

出　　处：《环境科学》2009年第9期2804-2808,共5页Environmental Science

基　　金：国家高技术研究发展计划(863)项目(2007AA06A410);国家自然科学基金项目(40802055)

摘　　要：通过室内模拟柱实验研究了BTEX在地下环境中的自然衰减过程,发现BTEX通过以细砂为介质的模拟地下环境时确实发生了自然衰减,挥发和生物降解作用是其自然衰减的重要机制.以苯为例,其在水中的质量浓度为11.40 mg/L左右时,挥发和生物降解作用占自然衰减的比例分别是16.36%和4.91%;而甲苯浓度为3.30 mg/L左右时,两者所占比例分别是11.04%和41.50%.可见BTEX中各组分衰减规律不同.BTEX浓度越大,其挥发得也越快,挥发对自然衰减的作用越大.微生物降解作用对甲苯更有效,占自然衰减的41.50%,间、对二甲苯次之占8.49%,而苯和乙苯很难被降解.Columns filled with fine sands was constructed to evaluate the natural attenuation process of BTEX in the underground environment. It was found that the naturally attenuation of BTEX occurred. In this process, volatilization and biodegradation are the important mechanisms. Taking benzene for example, at the concentration of 11.40 mg/L, the relative proportions of volatilization and biodegradation accounting for natural degradation were 16.36% and 4.91%. Comparatively, at the concentration of 3.30 mg/L for toluene, the relative proportions of volatilization and biodegradation accounting for natural degradation were 11.04% and 41.50% . It demonstrated that different components of BTEX had different attenuation trends. Furthermore, the higher the concentration of BTEX was, the faster the BTEX volatilized, and more important volatilization was. The effect of hiodegradation on toluene was more efficiency, whose proportion accounting for natural degradation was 41.50% , and xylene only occupied 8.49% , while, benzene and ethylbenzene were hardly degraded.

关 键 词：BTEX 自然衰减 挥发 生物降解 苯 

分 类 号：X131.2[环境科学与工程—环境科学]