作　　者： ; ; ; ;

机构地区： 清华大学环境学院环境模拟与污染控制联合国家重点实验室

出　　处： 《环境科学学报》 2010年第1期60-65,共6页

摘　　要： 生物过滤技术对难生物降解VOCs的处理效果较差,构建紫外光降解-生物过滤联合处理工艺是解决难生物降解VOCs处理的一个有效手段.已有研究表明,紫外光降解预处理对氯苯生物过滤塔的去除性能有促进作用.为了考察紫外预处理对生物过滤塔的影响机理,本研究分别考察了氯苯紫外光降解主要产物氯酚、乙酸以及副产物臭氧对生物过滤塔运行性能的影响.研究结果表明,加入乙酸降低了生物过滤塔的氯苯去除性能,在增加喷淋量后去除性能有所恢复.加入邻氯酚使生物过滤塔的氯苯去除性能略有降低.臭氧明显促进了生物过滤塔的氯苯去除性能,当进口臭氧浓度在60～120mg.m-3时,氯苯平均去除率可由70%提高到90%以上.因此,臭氧是紫外预处理促进生物过滤塔运行性能的主要因素. The traditional biofilter cannot achieve a satisfactory removal efficiency for non-biodegradable volatile organic compounds （VOCs）. A joint process combining UV and a biofiltration unit showed potential advantages for non-biodegradable VOC treatment. In a previous study, the biofilter′s performance in chlorobenzene removal was promoted by UV pretreatment. In this study, the effects of adding chlorophenol, acetic acid and ozone were investigated separately in order to further study the mechanism of UV induced enhancement. The experimental results showed that adding acetic acid into the inlet gas decreased the chlorobenzene removal rate of the biofilter. The chlorobenzene removal capacity was recovered by increasing the spray volume of the nutrient solution. The impact of adding chlorophenol was similar with acetic acid but very limited. Ozone significantly enhanced the chlorobenzene removal rate of the biofilter. When the inlet ozone concentration was between 60-120 mg·m^-3, the removal rate was more than 90%. All the results showed that ozone is the key factor enhancing the biofilter′s performance.

关 键 词： 氯苯 生物过滤 联合工艺 紫外光降解 臭氧

领　　域： [环境科学与工程]