Recovery and biological oxidation of dissolved methane in effluent from UASB treatment of municipal sewage using a two-stage closed downflow hanging sponge system
Recovery and biological oxidation of dissolved methane in effluent from UASB treatment of municipal sewage using a two-stage closed downflow hanging sponge system
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DOI：
10.1016/j.jenvman.2014.12.026
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发表时间：
2015-03-15
影响因子：
8.7
通讯作者：
Ohashi, Akiyoshi
中科院分区：
文献类型：
--
作者：
Matsuura, Norihisa;Hatamoto, Masashi;Ohashi, Akiyoshi
采用两级封闭式下流式悬挂式海绵反应器（DHS）作为后处理工艺，对含有未回收溶解性甲烷的上流式厌氧污泥床（UASB）出水进行了甲烷排放控制。使用真实的城市污水在环境温度（10-28摄氏度）下评价封闭DHS反应器的性能一年。密闭DHS反应器的第一阶段旨在从UASB流出物中回收溶解的甲烷并产生甲烷浓度大于30%的可燃气体，其回收效率为57- 88%，尽管UASB流出物中溶解的甲烷量在46- 68%的范围内波动，这极大地取决于温度。在第二个封闭的DHS反应器中，残留的甲烷被氧化，剩余的有机碳被去除，并且该反应器表现得非常好，在实验期间去除超过99%的溶解甲烷。空气供应到DHS反应器的速率被认为是最重要的操作参数之一。微生物群落分析表明，甲烷氧化细菌的季节性变化是防止甲烷排放的关键。(C)2014爱思唯尔有限公司版权所有。
A two-stage closed downflow hanging sponge (DHS) reactor was used as a post-treatment to prevent methane being emitted from upflow anaerobic sludge blanket (UASB) effluents containing unrecovered dissolved methane. The performance of the closed DHS reactor was evaluated using real municipal sewage at ambient temperatures (10-28 degrees C) for one year. The first stage of the closed DHS reactor was intended to recover dissolved methane from the UASB effluent and produce a burnable gas with a methane concentration greater than 30%, and its recovery efficiency was 57-88%, although the amount of dissolved methane in the UASB effluent fluctuated in the range of 46-68 % of methane production greatly depending on the temperature. The residual methane was oxidized and the remaining organic carbon was removed in the second closed DHS reactor, and this reactor performed very well, removing more than 99% of the dissolved methane during the experimental period. The rate at which air was supplied to the DHS reactor was found to be one of the most important operating parameters. Microbial community analysis revealed that seasonal changes in the methane-oxidizing bacteria were key to preventing methane emissions. (C) 2014 Elsevier Ltd. All rights reserved.