Microbial community distribution and extracellular enzyme activities in leach bed reactor treating food waste: Effect of different leachate recirculation practices

Xu, Su Yun, Karthigkeyan, Obuli P., Selvam , Ammaiyappan, and Wong, Jonathan W.C (2014) Microbial community distribution and extracellular enzyme activities in leach bed reactor treating food waste: Effect of different leachate recirculation practices. Bioresource Technology, 168. pp. 41-48.

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Abstract

This study aimed at understanding the relationship between microbial community and extracellular enzyme activities of leach bed reactor (LBR) treating food waste under different leachate recirculation practices (once per day and continuous) and liquid to solid (L/S) ratios (1:1 and 0.5:1). Microbial community analysis using PCR-DGGE revealed that Lactobacillus sp., Bifidobacter sp., and Proteobacteria were the most abundant species. Number of phylotypes was higher in LBRs with intermittent recirculation; whereas, lower number of phylotypes dominated by the key players of degradation was observed with continuous recirculation. The L/S ratio of 1:1 significantly enhanced the volatile solids removal compared with 0.5:1; however, this effect was insignificant under once a day leachate recirculation. Continuous leachate recirculation with 1:1 L/S ratio significantly improved the organic leaching (240. g. COD/kg. volatile solid) and showed distinct extracellular enzyme activities suitable for food waste acidogenesis. © 2014 Elsevier Ltd.

Item ID: 34692
Item Type: Article (Research - C1)
ISSN: 1873-2976
Additional Information:

food waste; leach bed reactor; hydrolysis; extracellular enzymes; microbial community

Date Deposited: 16 Sep 2014 04:34
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 40%
10 TECHNOLOGY > 1003 Industrial Biotechnology > 100305 Industrial Microbiology (incl Biofeedstocks) @ 60%
SEO Codes: 85 ENERGY > 8598 Environmentally Sustainable Energy Activities > 859805 Management of Solid Waste from Energy Activities @ 100%
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