Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea.
Green Environmental Complex Center, Suncheon 57992, Republic of Korea.
J Microbiol Biotechnol. 2021 Jun 28;31(6):803-814. doi: 10.4014/jmb.2103.03005.
A pilot-scale biocover was constructed at a sanitary landfill and the mitigation of methane and odor compounds was compared between the summer and non-summer seasons. The average inlet methane concentrations were 22.0%, 16.3%, and 31.3%, and the outlet concentrations were 0.1%, 0.1%, and 0.2% during winter, spring, and summer, respectively. The odor removal efficiency was 98.0% during summer, compared to 96.6% and 99.6% during winter and spring, respectively. No deterioration in methane and odor removal performance was observed even when the internal temperature of the biocover increased to more than 40°C at midday during summer. During summer, the packing material simultaneously degraded methane and dimethyl sulfide (DMS) under both moderately thermophilic (40-50°C) and mesophilic conditions (30°C). and , which can degrade methane and DMS at 40°C and 50°C, were isolated. The diversity of the bacterial community in the biocover during summer did not decrease significantly compared to other seasons. The thermophilic environment of the biocover during summer promoted the growth of thermotolerant and thermophilic bacterial populations. In particular, the major methane-oxidizing species were spp. during summer and spp. during the nonsummer seasons. The performance of the biocover remained stable under moderately thermophilic conditions due to the replacement of the main species and the maintenance of bacterial diversity. The information obtained in this study could be used to design biological processes for methane and odor removal during summer and/or in subtropical countries.
在一个卫生填埋场建造了一个中试规模的生物覆盖层，并比较了夏季和非夏季季节之间甲烷和气味化合物的缓解情况。冬季、春季和夏季的平均入口甲烷浓度分别为 22.0%、16.3%和 31.3%，出口浓度分别为 0.1%、0.1%和 0.2%。夏季的臭气去除效率为 98.0%，而冬季和春季分别为 96.6%和 99.6%。即使在夏季中午生物覆盖层内部温度升高到 40°C 以上时，甲烷和气味去除性能也没有恶化。夏季，包装材料在中温（40-50°C）和适温（30°C）条件下同时降解甲烷和二甲基硫（DMS）。分离出了可以在 40°C 和 50°C 下降解甲烷和 DMS 的 和 。与其他季节相比，夏季生物覆盖层中的细菌群落多样性并没有显著降低。夏季生物覆盖层的高温环境促进了耐热和嗜热细菌种群的生长。特别是，主要的甲烷氧化物种在夏季是 ，而非夏季季节是 。由于主要物种的更替和细菌多样性的维持，生物覆盖层在中温条件下保持稳定的性能。本研究获得的信息可用于设计夏季和/或亚热带国家的甲烷和气味去除生物工艺。
