Journal
BIORESOURCE TECHNOLOGY
Volume 171, Issue -, Pages 491-494Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.08.089
Keywords
Anaerobic digestion; Food waste; Early warning indicators; Organic overloading; Process stability
Funding
- Key Projects in the National Science & Technology Pillar Program during the Eleventh Five-year Plan Period [2010BAC67B01]
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To determine reliable state parameters which could be used as early warning indicators of process failure due to the acidification of anaerobic digestion of food waste, three mesophilic anaerobic digesters of food waste with different operation conditions were investigated. Such parameters as gas production, methane content, pH, concentrations of volatile fatty acid (VFA), alkalinity and their combined indicators were evaluated. Results revealed that operation conditions significantly affect the responses of parameters and thus the optimal early warning indicators of each reactor differ from each other. None of the single indicators was universally valid for all the systems. The universally valid indicators should combine several parameters to supply complementary information. A combination of total VFA, the ratio of VFA to total alkalinity (VFA/TA) and the ratio of bicarbonate alkalinity to total alkalinity (BA/TA) can reflect the metabolism of the digesting system and realize rapid and effective early warning. (C) 2014 Elsevier Ltd. All rights reserved.
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