Journal
WASTE MANAGEMENT
Volume 114, Issue -, Pages 115-123Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2020.06.040
Keywords
Spatiotemporally anaerobic/semi-aerobic bioreactor; Biogas evolution; Microbial community; Carbon emission; Energy potential; Rural domestic waste
Categories
Funding
- Science and Technology Program for Distinguished Young Scientists of Sichuan Province [2020JDJQ0053]
- China Postdoctoral Science Foundation [2018T110953]
- Major Special Science and Technology Project of Sichuan Province [2019YFS0509]
- National Natural Science Foundation of China [41907128]
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project [SKLGP2019Z009]
- Teacher Development Research Startup Fund of Chengdu University of Technology [10912-2018KYQD-06836]
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The biogas generation mechanism and its utilization potential in a novel spatiotemporally anaerobic/semi-aerobic bioreactor (STASAB) system with three activated bioreactors (C1, C2 and C3) was analyzed. Methane generation potential was obtained by measurements and estimation methods with similar values of 23.38 and 27.79 kg CH4/t waste, respectively. CH4 and CO2 production was quickly achieved in the STASAB, and the total amount of CH4 and CO2 was low due to the mixed leachate-recirculation operation process among bioreactors, which were at different stages of operation. The microbial communities in different bioreactors were diverse. The leachate-recirculation operation was a critical parameter to effectively enhance the microbial community structure in the STASAB, which can regulate CH4, CO2 and N2O production with global warming potential of 7.479 kg CO(2)e/(t.d). The STASAB had higher energy potential of 1.011 kWh/(t.d) compared with that of conventional landfills and sequentially anaerobic/semi-aerobic bioreactors. Moreover, direct electricity production in the STASAB is recommended for energy utilization with 38.38% GHG emission reduction, and with 131.43 million CNY (Chinese Yuan) benefit per year for national rural waste disposal via utilization of biogas from the STASAB for power generation. Hence, the STASAB shows a notable potential for treating domestic waste in rural areas. (C) 2020 Elsevier Ltd. All rights reserved.
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