WATER RESEARCH | 卷:90 |
Bacterial communities and their association with the bio-drying of sewage sludge | |
Article | |
Cai, Lu1,2  Chen, Tong-Bin2  Gao, Ding2  Yu, Jie1  | |
[1] Ningbo Univ, Fac Architectural Civil Engn & Environm, Ningbo 315211, Zhejiang, Peoples R China | |
[2] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Ctr Environm Remediat, Beijing, Peoples R China | |
关键词: Bacterial communities; Bio-drying; Degradation; Sewage sludge; Water evaporation; Water generation; | |
DOI : 10.1016/j.watres.2015.12.026 | |
来源: Elsevier | |
【 摘 要 】
Bio-drying is a technology that aims to remove water from a material using the microbial heat originating from organic matter degradation. However, the evolution of bacterial communities that are associated with the drying process has not been researched systematically. This study was performed to investigate the variations of bacterial communities and the relationships among bacterial communities, water evaporation, water generation, and organic matter degradation during the bio-drying of sewage sludge. High-throughput pyrosequencing was used to analyze the bacterial communities, while water evaporation and water generation were determined based on an in situ water vapor monitoring device. The values of water evaporation, water generation, and volatile solids degradation were 412.9 g kg(-1) sewage sludge bio-drying material (SSBM), 65.0 g kg(-1) SSBM, and 70.2 g kg(-1) SSBM, respectively. Rarefaction curves and diversity indices showed that bacterial diversity plummeted after the temperature of the bio-drying pile dramatically increased on d 2, which coincided with a remarkable increase of water evaporation on d 2. Bacterial diversity increased when the pile cooled. During the thermophilic phase, in which Acinetobacter and Bacillus were the dominant genera, the rates of water evaporation, water generation, and VS degradation peaked. These results implied that the elevated temperature reshaped the bacterial communities, which played a key role in water evaporation, and the high temperature also contributed to the effective elimination of pathogens. (C) 2015 Elsevier Ltd. All rights reserved.
【 授权许可】
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