改性膨润土促进水中石油烃生物降解的研究  

Study on mechanisms of oil biodegradation in water enhanced by modified bentonite

作　　者：陈荔[1] 亢万忠[2] 陈昕[2] 仝明[2] 王肖倩[1] 周彦波[1] 鲁军[1] 

机构地区：[1]华东理工大学资源与环境工程学院,上海市200237 [2]中国石化宁波技术研究院,浙江省宁波市315103

出　　处：《炼油技术与工程》2013年第3期51-55,共5页Petroleum Refinery Engineering

基　　金：国家自然科学基金(51208201);华东理工大学基本科研业务费探索基金(WB1114033)

摘　　要：水面浮油的快速分散是石油烃生物降解的前提。通过向油水混合液中投加表面活性剂改性膨润土微粒,使之与油滴形成聚结物Oil-Mineral-Aggregate(OMA),进而促进水中石油烃的分散与生物降解速率。考察了不同类型改性膨润土与油滴的聚结效率,选取油分散效率最高的十六烷基三甲基溴化铵(CTAB)改性膨润土,研究其在不同添加量下对降解菌Micrococcussp.HY8降解石油烃行为的影响。结果表明,改性膨润土使石油烃降解的半衰期缩短,加快了降解速度。当油水混合液中石油烃初始浓度1 686 mg/L,添加400 mg/L CTAB改性膨润土时,第7天石油烃的微生物降解率达到86.6%,比空白水样高26.8%。在油污染水体中添加改性膨润土微粒可加速生物修复过程,具有良好的应用前景。Rapid dispersion of oil slick in water is the precondition for oil biodegradation. Bentonite partides modified by suffactant were added into oily water mixture to form oil-mineral-aggregate （OMA） with oil droplets, which enhanced the oil dispersion and biodegradation rates. The impact of different types of modified bentonites on OMA formation efficiency was studied in the lahoratory. The most effective CTAB modified ben- tonite was selected for oil biodegradation experiment. Petroleum degrading strains Microeoecussp HY8 were cultured in the diesel oil and bentonite liquid suspension. The impact of bentonite content on oil degradation was investigated. The results showed that the addition of modified bentonite shortened the half-life period of the oil degradation and increased the degradation rate. The oil degradation efficiency reached 86.6% under conditions of primaU oil concentration of 1 686 mg/L and CTAB modified bentonite content of 400 rag/l,, which was 26.8% higher than that of the sample without any bentonite after 7 days euhivation. The application of modified bentonite whic.h can enhanee the bioremediation of oil polluted water has good application prospects.

关 键 词：OMA 生物降解 油分散 改性膨润土 

分 类 号：X13[环境科学与工程—环境科学]