Department of Biology
Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: Effect of pH and bulking agent
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 (0.182l CH4/g VSadded) than other bulking agents. © 2010 Elsevier Ltd.
Bottom ash, Bulking agents, Food waste, Hydrolysis/acidogenesis, Leach bed reactor
Source Publication Title
Xu, Su Yun, Hoi Pui Lam, O. Parthiba Karthikeyan, and Jonathan W.C. Wong. "Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: Effect of pH and bulking agent." Bioresource Technology 102.4 (2011): 3702-3708.