期刊
BIORESOURCE TECHNOLOGY
卷 165, 期 -, 页码 183-190出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.03.138
关键词
Waste activated sludge; Alkaline-mechanical pretreatment; Anaerobic digestion; Co-metabolism; Economic analysis
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology (MOST) [2011-0014666]
- National Research Foundation of Korea [2011-0014666] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Although various pretreatments have been widely investigated to enhance the anaerobic digestion (AD) of waste activated sludge (WAS), economic feasibility issues have limited real-world applications. The authors examined the performance and economic analysis of an alkaline-mechanical process with a novel mechanical crushing device for thickened WAS pretreatment. The pretreatment at 40 g TS/L, pH 13, and 90 min reaction time achieved 64% of solubilization efficiency and 8.3 times higher CH4 yield than the control. In addition, a synergistic CH4 yield enhancement was observed when the pretreated and raw WAS were used together as feedstock, and the greatest synergy was observed at a volumetric mixture ratio of 50:50. Economic estimates indicate that up to 22% of WAS treatment costs would be saved by the installation of the suggested process. The experimental results clearly indicate that the alkaline-mechanical process would be highly effective and economically feasible for the AD of thickened WAS. (C) 2014 Elsevier Ltd. All rights reserved.
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