期刊
BIORESOURCE TECHNOLOGY
卷 179, 期 -, 页码 291-298出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.12.011
关键词
Ferric salts; Waste activated sludge; Dissolved organic matters; EEM fluorescence spectroscopy; Methanosarcina
资金
- National Hi-Tech Research and Development Program of China (863) [2011AA060906]
- National Natural Science Foundation of China [51178261]
- Key project of Science and Technology Commission of Shanghai Municipality [12231202101, 14DZ1207306]
- National Key Laboratory of Human Factors Engineering [HF2012-K-05]
Ferric salts will influence the thermophilic anaerobic digestion of waste activated sludge (WAS). FeCl3 was found to contribute to the anaerobic digestion process with a cumulative biogas production of 357 mL/gVS, 79.6% higher than that in the control group, and Fe-2(SO4)(3) had no distinct impact, while Fe(NO3)(3) inhibited the methanogenesis process. A favorable balance between the release of organic matters from WAS and consumption rate was established after dosing FeCl3 from the perspective of variations of soluble COD, volatile fatty acids (VFAs) and the dissolved organic matters (DOM) assessed by EEM fluorescence spectroscopy and fluorescence regional integration (FRI) technique. Conversely, the system with Fe(NO3)(3) achieved an unsuitable substrates environment. Pyrosequencing revealed that the anaerobic digestion system with FeCl3 enriched Coprothermobacter for proteins fermentation and Methanosarcina for methanogenesis with the values of 18.7% and 63.2%, respectively, while that with the supplementation of Fe(NO3)(3) obtained the lowest relative abundance. (C) 2014 Elsevier Ltd. All rights reserved.
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