管式生物过滤器去除乙苯废气  

Evaluation of tubular biofilter performances for ethylbenzene removal from waste gas streams

作　　者：徐超 杨春平[1,2,3] 何慧军[1,2] 程燕[1,2] 吕黎[3] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]湖南大学环境生物与控制教育部重点实验室,长沙410082 [3]浙江工商大学环境科学与工程学院,浙江省固体废物处理与资源化重点实验室,杭州310018

出　　处：《环境工程学报》2014年第4期1579-1585,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51278464);高等学校博士学科点专项科研基金资助课题(20090161110010)

摘　　要：生物过滤由于其良好的成本效益和环境友好性已经成为控制挥发性有机化合物(VOCs)含量和气味气体排放的常规技术。营养物质的均匀分布、生物膜和介质床内的气体流是成就一个性能优良的生物过滤器至关重要的因素。而由本实验室开发的管式生物过滤器(TBFs)已被证明具备此优势。本实验的管式生物过滤器以聚氨酯海绵作为填料,研究在不同有机负荷、气体停留时间(EBCT)、进气量和表面活性剂等条件下乙苯废气的去除效率(RE)。实验同时记录了管式生物过滤器启动阶段的表现。初期使附着在填料上的微生物暴露在浓度为40 mg/m3的乙苯废气中40 d,此时的气体停留时间为15 s,使微生物慢慢适应并逐步降解乙苯废气;然后连续地控制管式生物过滤器的入口乙苯浓度为40、80、120和160 mg/m3,以使有机负荷逐步升高。结果表明,乙苯去除效率随着有机负荷的增大而逐步减小。当气体停留时间从15 s增加到30 s和60 s,而有机负荷控制在38.60 g/(m3·h)时,乙苯废气去除效率略微增加。此外,随着进气量的增大乙苯废气的最大平均去除效率有所下降而此时的降解容量增大,这个过程中乙苯进气浓度保持不变。结果还表明,在营养液中加入聚乙二醇辛基苯基醚这种表面活性剂可以提高乙苯废气的去除效率。Biofiltration is becoming a conventional technology for the control of volatile organic compounds （VOCs） and odor emissions from waste gas streams due to its well cost-effectiveness and environmental friendli- ness. Even distribution of nutrient solutions, biofilms, and gas streams within the medium bed is crucial to a better performance of a biofilter. Tubular biofilters （TBFs） manufactured in this laboratory show this advantage. In this investigation,performances of tubular biofilters packed with polyurethane sponge media were evaluated under va- rious ethylbenzene loading rates,gas empty bed contact time （EBCT） and different gas flow rates. The perform- ances of the TBFs were monitored at the start-up period. The acclimation of microbial to ethylbenzene was a- chieved by exposing the biofilter bed to an inlet ethylbenzene concentration of 40 mg/m3 and an EBCT of 15 s for 40 days. Then, the TBFs were operated continuously at inlet ethylbenzene concentrations of 40,80,120 and 160 mg/m3. Results showed that the ethylbenzene removal efficiency （RE） decreased with an increased ethylbenzene loading rate. When EBCT increased from 15 s to 30 s and 60 s at a constant VOC loading rate of 38.60 g ethyl- benzene/（m3 ~ h） ,the ethylbenzene RE increased slightly. In addition, the maximum average RE was decreased while the elimination capacity increased with increased gas flow rate at a constant inlet ethylhenzene concentration. Results also showed that suffactant Triton X-100 in the nutrient solution led to a higher RE.

关 键 词：生物过滤 乙基苯 表面活性剂 管式生物过滤器 挥发性有机化合物 

分 类 号：X701.7[环境科学与工程—环境工程]