Journal
WASTE MANAGEMENT
Volume 35, Issue -, Pages 119-126Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2014.09.004
Keywords
Thermophilic anaerobic digestion; Initial pH value; Manure ratios; Optimum reaction condition
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Funding
- Research Fund for the Doctoral Program of Higher Education of Northwest A & F University, China [2013BSJJ057]
- Basic Scientific Fund of Northwest A F University [QM2012002]
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The contradictions between the increasing energy demand and decreasing fossil fuels are making the use of renewable energy the key to the sustainable development of energy in the future. Biogas, a renewable clean energy, can be obtained by the anaerobic fermentation of manure waste and agricultural straw. This study examined the initial pH value had obvious effect on methane production and the process in the thermophilic anaerobic co-digestion. Five different initial pH levels with three different manure ratios were tested. All digesters in different initial pH showed a diverse methane production after 35 days. The VFA/alkalinity ratio of the optimum reaction condition for methanogens activity was in the range of 0.1-0.3 and the optimal condition that at the 70% dung ratio and initial pH 6.81, was expected to achieve maximum total biogas production (146.32 mL/g VS). (C) 2014 Elsevier Ltd. All rights reserved.
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