Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 133, Issue -, Pages 268-274Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2013.12.016
Keywords
Anaerobic digestion; Dairy manure; Dewaterability; Food waste; Mechanical pretreatment; Organic loading rate
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Funding
- Ford Foundation-IFP
- Association of African Universities
- U.S. EPA [SU835331]
- EPA [672814, SU835331] Funding Source: Federal RePORTER
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This study was to comprehensively evaluate the effects of food waste particle size on co-digestion of food waste and dairy manure at organic loading rates increased stepwise from 0.67 to 3 g/L/d of volatile solids (VS). Three anaerobic digesters were fed semi-continuously with equal VS amounts of food waste and dairy manure. Food waste was ground to 2.5 mm (fine), 4 mm (medium), and 8 mm (coarse) for the three digesters, respectively. Methane production rate and specific methane yield were significantly higher in the digester with fine food waste. Digestate dewaterability was improved significantly by reducing food waste particle size. Specific methane yield was highest at the organic loading rate of 2 g VS/L/d, being 0.63, 0.56, and 0.47 L CH4/g VS with fine, medium, and coarse food waste, respectively. Methane production rate was highest (1.40-1.53 L CH4/L/d) at the organic loading rate of 3 g VS/L/d. The energy used to grind food waste was minor compared with the heating value of the methane produced. (C) 2013 Elsevier Ltd. All rights reserved.
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