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首页> 外文期刊>Chemical engineering journal >Comparison of hyper-thermophilic-mesophilic two-stage with single-stage mesophilic anaerobic digestion of waste activated sludge: Process performance and microbial community analysis
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Comparison of hyper-thermophilic-mesophilic two-stage with single-stage mesophilic anaerobic digestion of waste activated sludge: Process performance and microbial community analysis

机译：废活性污泥的超高温-中温两级与单级中温厌氧消化的比较：工艺性能和微生物群落分析

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摘要

The conventional mesophilic digestion of waste activated sludge (WAS) is challenged by the updated wastewater treatment process. A hyper-thermophilic (70 degrees C)-mesophilic (35 degrees C) temperature-phased two-stage systems without and with recirculation were employed to upgrade the single-stage mesophilic digestion of waste activated sludge in this study. The solid reduction increased by more than 10% in the two-stage systems. Similar methane production was observed in the single-stage system and two-stage systems, with a methane yield of 0.24 L/g VS added. In the case of two-stage system without recirculation, hyper-thermophilic stage played an important role in COD solubilization, with 34.4% of the WAS solubilized in that stage, while mesophilic stage contributed more in methane production, with 36.2% of COD in the WAS produced as methane in the mesophilic stage. Firmicutes became the most dominant bacteria phylum in the mesophilic stages of two-stage systems as compared to the dominant phylum Proteobacteria in single-stage system, with the genus Methanothermobacter cardinal in the hyper-thermophilic stage. The recirculation in the two-stage system increased the microbial community diversity in the hyper-thermophilic stage, which was one factor to result in improved methane production in the hyper-thermophilic stage. (C) 2016 Elsevier B.V. All rights reserved.
机译：废水处理工艺的更新挑战了废活性污泥（WAS）的常规中温消化。在本研究中，采用不带再循环和带再循环的超高温（70摄氏度）-中温（35摄氏度）温度分阶段的两阶段系统来升级废物活性污泥的单阶段中温消化。在两级系统中，固相减少量增加了10％以上。在单级系统和两级系统中观察到相似的甲烷产生，添加的甲烷产率为0.24 L / gVS。在没有再循环的两阶段系统中，超高温阶段在COD溶解中起重要作用，在该阶段溶解了34.4％的WAS，而中温阶段贡献了更多的甲烷产量，其中36.2％的COD WAS在中温阶段以甲烷形式产生。与单阶段系统的显性门菌属细菌相比，硬毛菌在两阶段系统的中温阶段成为最显性的细菌门，而甲烷杆菌属的主杆菌属在超嗜热阶段。两级系统中的再循环增加了超嗜热阶段微生物群落的多样性，这是导致超嗜热阶段甲烷产量提高的因素之一。 （C）2016 Elsevier B.V.保留所有权利。

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