Mezgebe Bineyam, Sorial George, Wendell David, Sahle-Demessie E
Department of Chemical and Environmental Engineering, College of Engineering and Applied Science, University of Cincinnati, 701 Engineering Research Center, 2901 Woodside Drive, P.O. Box 210012, Cincinnati, OH 45221-0012, USA.
Senior Scientist, US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Cincinnati, OH 45268, USA.
Eng Rep. 2019 Aug 16;1(1):1-12031. doi: 10.1002/eng2.12031.
In this study, the biodegradation of a mixture of two trihalomethane (THM) compounds, chloroform (CF) and dichlorobromomethane (DCBM), was evaluated using two laboratory-scale biotrickling filters (BTFs). The two BTFs, hereby designated as "BTF-A" and "BTF-B," were run parallel and used ethanol as co-metabolite at different loading rates (LRs), and a lipopeptide-type biosurfactant that was generated by the gram-positive bacteria, Surfactin, respectively. The results using BTF-A showed that adding ethanol at a higher rate of 4.59 g/(m h) resulted in removal efficiencies of 85% and 87% for CF and DCBM, respectively. Conversely, for the same LR, the use of Surfactin without ethanol (BTF-B) showed comparable removal efficiencies of 85% and 80% for CF and DCBM, respectively. The maximum rate constant for CF and DCBM for the BTF-A was 0.00203 s and 0.0022 s, respectively. For the same THMs LR, similar reaction rate constants resulted for the BTF-B. Further studies were conducted to investigate and understand the microbial diversity within both BTFs. The result indicated that for BTF with co-metabolite, . was the most dominant fungi over 98% followed by with less than 2%. and . were instead the .
在本研究中，使用两个实验室规模的生物滴滤池（BTF）评估了两种三卤甲烷（THM）化合物氯仿（CF）和二氯溴甲烷（DCBM）混合物的生物降解情况。这两个生物滴滤池在此分别指定为“BTF - A”和“BTF - B”，它们并行运行，分别以不同的负荷率（LR）使用乙醇作为共代谢物，以及由革兰氏阳性菌产生的脂肽型生物表面活性剂鼠李糖脂。使用BTF - A的结果表明，以4.59 g/(m³·h)的较高速率添加乙醇时，CF和DCBM的去除效率分别为85%和87%。相反，对于相同的负荷率，在不使用乙醇的情况下使用鼠李糖脂（BTF - B）时，CF和DCBM的去除效率分别为85%和80%，具有可比性。BTF - A中CF和DCBM的最大速率常数分别为0.00203 s⁻¹和0.0022 s⁻¹。对于相同的三卤甲烷负荷率，BTF - B也得到了类似的反应速率常数。进行了进一步的研究以调查和了解两个生物滴滤池内的微生物多样性。结果表明，对于使用共代谢物的生物滴滤池，……是最主要的真菌，占比超过98%，其次是……，占比不到2%。相反，……和……是…… （注：原文最后部分表述不完整且有乱码情况，翻译时尽量按现有内容准确翻译）
