Document Type

Journal Article

Department/Unit

Sino-Forest Applied Research Centre for Pearl River Delta Environment

Title

Effect of inoculum to substrate ratio on the hydrolysis and acidification of food waste in leach bed reactor

Language

English

Abstract

The aim of present study was to determine an appropriate ISR (inoculum to substrate ratio) to enhance the hydrolysis rate and reduce the solid retention time of food waste in hydrolytic-acidogenesis leach bed reactor (LBR). LBR 1-4 were inoculated with 0%, 5%, 20% and 80% (w/w basis) of anaerobically digested sludge, respectively, using artificial food waste as substrate. Experiments were conducted in batch mode at mesophilic condition (35 °C) for 17 days. Higher ISR resulted in 4.3-fold increase in protein hydrolysis; whereas, only a modest increase in the decomposition of carbohydrate. Two kinetic models for carbohydrate and protein degradation were proposed and evaluated. The differences among four ISRs in volatile solids removal efficiencies were marginal, i.e. 52.4%, 62.8%, 63.2% and 71.7% for LBR 1-4, respectively; indicating that higher ISR was insignificant in enhancing the overall hydrolysis rate in LBR. Therefore, a lower ISR of 20% was recommended in the hydrolytic-acidogenic process. © 2011 Elsevier Ltd. All rights reserved.

Keywords

Acidogenesis, Anaerobic digestion, Inoculum to substrate ratio, Kinetics study, Proteolytic bacteria

Publication Date

2012

Source Publication Title

Bioresource Technology

Volume

126

Start Page

425

End Page

430

Publisher

Elsevier

DOI

10.1016/j.biortech.2011.12.059

ISSN (print)

09608524

ISSN (electronic)

18732976

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