Long-term anaerobic digestion of food waste stabilized by trace elements

Journal Article · Wed Aug 15 00:00:00 EDT 2012 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2012.03.015· OSTI ID:21613000

Jahng, Deokjin ^[1]

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1. Department of Environmental Engineering and Biotechnology, Myongji University, San 38-2, Namdong, Cheoin-Gu, Yongin, Gyeonggi-Do 449-728 (Korea, Republic of)

Highlights: Black-Right-Pointing-Pointer Korean food waste was found to contain low level of trace elements. Black-Right-Pointing-Pointer Stable anaerobic digestion of food waste was achieved by adding trace elements. Black-Right-Pointing-Pointer Iron played an important role in anaerobic digestion of food waste. Black-Right-Pointing-Pointer Cobalt addition further enhanced the process performance in the presence of iron. - Abstract: The purpose of this study was to examine if long-term anaerobic digestion of food waste in a semi-continuous single-stage reactor could be stabilized by supplementing trace elements. Contrary to the failure of anaerobic digestion of food waste alone, stable anaerobic digestion of food waste was achieved for 368 days by supplementing trace elements. Under the conditions of OLR (organic loading rates) of 2.19-6.64 g VS (volatile solid)/L day and 20-30 days of HRT (hydraulic retention time), a high methane yield (352-450 mL CH{sub 4}/g VS{sub added}) was obtained, and no significant accumulation of volatile fatty acids was observed. The subsequent investigation on effects of individual trace elements (Co, Fe, Mo and Ni) showed that iron was essential for maintaining stable methane production. These results proved that the food waste used in this study was deficient in trace elements.

• OSTI ID: 21613000
• Journal Information: Waste Management, Vol. 32, Issue 8; Other Information: DOI: 10.1016/j.wasman.2012.03.015; PII: S0956-053X(12)00125-0; Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ANAEROBIC DIGESTION
BUILDUP
CARBOXYLIC ACIDS
COBALT ADDITIONS
FOOD
IRON
METHANE
TRACE AMOUNTS
VOLATILITY
WASTES
YIELDS
ALKANES
ALLOYS
BIOCONVERSION
COBALT ALLOYS
DIGESTION
ELEMENTS
HYDROCARBONS
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENTS