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

Su Yun Xu, Hoi Pui Lam, O. Parthiba Karthikeyan, Jonathan W C WONG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3702-3708
Number of pages7
JournalBioresource Technology
Volume102
Issue number4
DOIs
Publication statusPublished - Feb 2011

Scopus Subject Areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

User-Defined Keywords

  • Bottom ash
  • Bulking agents
  • Food waste
  • Hydrolysis/acidogenesis
  • Leach bed reactor

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