Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: effect of pH and bulking agent

Xu, Su Yun, Lam, Hoi Pui, Karthikeyan, O. Parthiba, and Wong, Jonathan W.C. (2011) Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: effect of pH and bulking agent. Bioresource Technology, 102 (4). pp. 3702-3708.

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Abstract

The effects of pH and bulking agents on hydrolysis/acidogenesis of food waste were studied using leach bed reactor (LBR) coupled with methanogenic up-flow anaerobic sludge blanket (UASB) reactor. The hydrolysis rate under regulated pH (6.0) was studied and compared with unregulated one during initial experiment. Then, the efficacies of five different bulking agents, i.e. plastic full particles, plastic hollow sphere, bottom ash, wood chip and saw dust were experimented under the regulated pH condition. Leachate recirculation with 50% water replacement was practiced throughout the experiment. Results proved that the daily leachate recirculation with pH control (6.0) accelerated the hydrolysis rate (59% higher volatile fatty acids) and methane production (up to 88%) compared to that of control without pH control. Furthermore, bottom ash improved the reactor alkalinity, which internally buffered the system that improved the methane production rate (0.182 l CH4/g VSadded) than other bulking agents.

Item ID: 35917
Item Type: Article (Research - C1)
ISSN: 1873-2976
Keywords: food waste; hydrolysis/acidogenesis; leach bed reactor; bulking agents; bottom ash
Date Deposited: 29 Oct 2014 00:08
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050205 Environmental Management @ 40%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050209 Natural Resource Management @ 30%
09 ENGINEERING > 0907 Environmental Engineering > 090703 Environmental Technologies @ 30%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850501 Biofuel (Biomass) Energy @ 50%
90 COMMERCIAL SERVICES AND TOURISM > 9004 Water and Waste Services > 900401 Waste Management Services @ 50%
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