Qi Bing, Moe William M
Department of Civil and Environmental Engineering, Louisiana State University, 3418G CEBA Building, Baton Rouge, LA 70803, USA.
J Hazard Mater. 2006 Jul 31;135(1-3):303-10. doi: 10.1016/j.jhazmat.2005.11.065. Epub 2006 Jan 6.
Two biofilters packed with a reticulated polyurethane foam medium were inoculated with a compost-derived enrichment culture grown under acidic conditions (pH 3.0) and then operated over a period lasting 63 days. Both biofilters were supplied with a humidified gas stream containing a five-component mixture of acetone, methyl ethyl ketone, toluene, ethylbenzene, and p-xylene at a total VOC loading rate 80.3 gm(-3)h(-1) to simulate treatment of air emissions resulting from manufacture of reformulated paint. One biofilter was operated under continuous loading conditions and the other received intermittent loading with contaminants supplied only 8 h/day. Nutrient solution with pH 3.0 was supplied approximately once per week to provide nitrogen and other nutrients. Data are presented which demonstrate that undefined mixed cultures acclimated at low pH can successfully treat paint solvent mixtures in biofilters. The biofilter receiving continuous loading reached high overall removal efficiency (greater than 90% overall removal) 3 weeks after startup, and performance increased over time reaching overall removal in the range of 97-99% after 50 days. Performance of the intermittently loaded biofilter developed more slowly, requiring 6 weeks to stabilize at an overall removal efficiency in excess of 90%. In both biofilters, ketone components were more rapidly degraded than aromatic components, and removal of aromatic compounds was somewhat unstable even after 2 months of biofilter operation. Scanning electron microscopy (SEM) revealed that fungi dominated the microbial populations in both biofilters.
两个填充有网状聚氨酯泡沫介质的生物滤池接种了在酸性条件（pH 3.0）下培养的堆肥衍生富集培养物，然后运行63天。向两个生物滤池供应含有丙酮、甲乙酮、甲苯、乙苯和对二甲苯五组分混合物的加湿气流，总VOC负荷率为80.3 g m⁻³ h⁻¹，以模拟处理重新配制涂料生产过程中产生的废气。一个生物滤池在连续加载条件下运行，另一个接受间歇加载，污染物仅每天供应8小时。每周大约供应一次pH 3.0的营养液以提供氮和其他养分。所呈现的数据表明，在低pH条件下适应的未定义混合培养物能够成功地在生物滤池中处理涂料溶剂混合物。接受连续加载的生物滤池在启动3周后达到了较高的总去除效率（总去除率大于90%），并且性能随时间增加，在50天后总去除率达到97-99%。间歇加载生物滤池的性能发展较慢，需要6周才能稳定在总去除效率超过90%的水平。在两个生物滤池中，酮类成分比芳香族成分降解得更快，并且即使在生物滤池运行2个月后，芳香族化合物的去除也有些不稳定。扫描电子显微镜（SEM）显示，真菌在两个生物滤池的微生物群落中占主导地位。
