Document Type
Journal Article
Department/Unit
Department of Biology
Title
Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: Effect of pH and bulking agent
Language
English
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 (0.182l CH4/g VSadded) than other bulking agents. © 2010 Elsevier Ltd.
Keywords
Bottom ash, Bulking agents, Food waste, Hydrolysis/acidogenesis, Leach bed reactor
Publication Date
2011
Source Publication Title
Bioresource Technology
Volume
102
Issue
4
Start Page
3702
End Page
3708
Publisher
Elsevier
DOI
10.1016/j.biortech.2010.11.095
Link to Publisher's Edition
http://dx.doi.org/10.1016/j.biortech.2010.11.095
ISSN (print)
09608524
ISSN (electronic)
18732976
APA Citation
Xu, S., Lam, H., Karthikeyan, O., & Wong, J. (2011). Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: Effect of pH and bulking agent. Bioresource Technology, 102 (4), 3702-3708. https://doi.org/10.1016/j.biortech.2010.11.095