Jorio Hasnaa, Jina Yaomin, Elmrini Hicham, Nikiemaa Josiane, Brzezinski Ryszard, Heitz Michèle
Department of Chemical Engineering, Faculty of Engineering, Université de Sherbrooke, Québec, Canada.
Environ Technol. 2009 Apr 14;30(5):477-85. doi: 10.1080/09593330902778849.
An experimental study on the removal of xylene vapours from an air stream was conducted on three identical upflow laboratory-scale wood-chips-based bed biofilters. Three different inoculums were used: fungi (Phanerochaete chrysosporium and Cladosporium sphaerospermum), a bacterial consortium (EVB110), and a mixed culture of fungi and EVB 110. The empty bed gas residence time was 59 s, and various inlet concentrations of the contaminant were tested. The results obtained revealed a strong correlation between the average temperature of the biofilter and the intensity of the microbial activity in the filter bed. In addition, the mass of carbon dioxide produced per mass of xylene removed was equal to 3.03, indicating elimination of the pollutant by aerobic biodegradation. The removal rates of xylene in both fungal and bacterial systems were similar up to an inlet load of 100 g m(-3) h(-1). However, a better performance was achieved in the fungal system at higher inlet loads of the pollutant. The maximum elimination capacity achieved in the fungal and bacterial systems was 77 and 58 g m(-3) h(-1), respectively; and an early set-off of the inhibition effects was observed in the latter. The bioreactor inoculated with the mixed culture was the least effective, with a maximum elimination capacity of only 38 g m(-3) h(-1). Problems with microbial population survival and competition among different types of microorganisms could be responsible of this lower performance. The fungal system was also tested for the removal of toluene vapour and achieved a maximum elimination capacity of 110 g m(-3) h(-1).
在三个相同的基于木屑的实验室规模上流式床生物滤池中，进行了从气流中去除二甲苯蒸气的实验研究。使用了三种不同的接种物：真菌（黄孢原毛平革菌和球孢枝孢菌）、一个细菌联合体（EVB110）以及真菌和EVB110的混合培养物。空床气体停留时间为59秒，并测试了污染物的各种进口浓度。所获得的结果表明，生物滤池的平均温度与滤床中微生物活性的强度之间存在很强的相关性。此外，每去除单位质量二甲苯产生的二氧化碳质量等于3.03，表明污染物通过好氧生物降解被去除。在进口负荷达到100 g m(-3) h(-1)之前，真菌和细菌系统中二甲苯的去除率相似。然而，在污染物进口负荷较高时，真菌系统表现更好。真菌和细菌系统中实现的最大去除能力分别为77和58 g m(-3) h(-1)；并且在后者中观察到抑制作用提前出现。接种混合培养物的生物反应器效果最差，最大去除能力仅为38 g m(-3) h(-1)。不同类型微生物之间的微生物种群存活和竞争问题可能是导致这种较低性能的原因。还对真菌系统进行了甲苯蒸气去除测试，其最大去除能力达到110 g m(-3) h(-1)。
