期刊
WASTE MANAGEMENT
卷 107, 期 -, 页码 91-100出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2020.04.004
关键词
Food waste; Anaerobic digestion; Two-stage; Zero-valent iron; Energy
资金
- National Key Research and Development Program of China [2018YFC1902903]
- Shenzhen Science and Technology Innovation Committee [KJYY20171012103638606]
This research investigated the roles of zero-valent iron (ZVI) in a two-stage food waste digestion process. ZVI was added separately to hydrolytic-acidogenic (HA) and methanogenic (MG) stages to understand its impacts on FW hydrolysis-acidification, methanogenesis and bioenergy recovery efficiency. Results showed that ZVI effectively enhanced the overall performance of digestion as compared with the controls without ZVI. Supplementing with ZVI could facilitate the HA process along with faster hydrogen generation. In addition, ZVI shortened the lag phase of MG stage by 42.43-57.23% and raised the maximum methane production rate and yield by 33.99-38.20% and 11-13%, respectively, compared with the controls. Supplementing ZVI to the HA stage could simultaneously raise the bioenergy recovery efficiency of the HA and MG stages by 71.92% and 96.96%, respectively. Further studies demonstrated that iron corrosion contributed little to hydrogen and methane production. The enrichment of syntrophic bacteria, Pseudomonas, and methanogens, and the enhancement of electron transfer among those microbes was supposed to be the main possible mechanism for the enhancement of methanogenesis with ZVI assisted. (C) 2020 Elsevier Ltd. All rights reserved.
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