Journal
BIORESOURCE TECHNOLOGY
Volume 216, Issue -, Pages 87-94Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.05.048
Keywords
Anaerobic digestion; Sewage sludge; Solid concentration; Microbial community
Funding
- China Major Science and Technology Program for Water Pollution Control and Treatment [2011ZX07302]
- Natural Science Foundation of China [51478239]
- Shenzhen Science and Technology Research and Development Fund [JSGG20130918153404812]
- State Scholarship fund [201508440145]
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High-solids anaerobic digestion (HSAD), a promising method with smaller reactor and less heating energy consumption, showed relatively lower digestion efficiency sometimes and higher tolerance to some inhibitors. To investigate the phenomena, the archaeal and bacterial communities in four anaerobic digesters treating sewage sludge with total solids (TS) of 10-19% were investigated. Although acetoclastic methanogenesis conducted mainly by genus Methanosarcina was still the main pathway producing methane, the total ratio of acetoclastic methanogens decreased along with the increased TS. In contrary, the relative abundance of hydrogenotrophic methanogens increased from 6.8% at TS 10% to 22.3% at TS 19%, and methylotrophic methanogens from 10.4% to 20.9%. The bacterial community was dominated by five phyla. Acidogenic and acetogenic bacteria affiliated to Firmicutes decreased following the increase of TS; while the proteolysis phylum Bacteroidetes increased, with a tolerant family ST-12K33 notably existing in the digesters at TS 17% and 19%. (C) 2016 The Author(s). Published by Elsevier Ltd.
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