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

ISSN (print)

09608524

ISSN (electronic)

18732976

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