TY - JOUR
T1 - Effect of inoculum to substrate ratio on the hydrolysis and acidification of food waste in leach bed reactor
AU - Xu, Su Yun
AU - Karthikeyan, Obuli P.
AU - Selvam, Ammaiyappan
AU - Wong, Jonathan W C
N1 - Publisher Copyright:
© 2011 Elsevier Ltd
PY - 2012/12
Y1 - 2012/12
N2 - 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.
AB - 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.
KW - Acidogenesis
KW - Anaerobic digestion
KW - Inoculum to substrate ratio
KW - Kinetics study
KW - Proteolytic bacteria
UR - http://www.scopus.com/inward/record.url?scp=84855403002&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2011.12.059
DO - 10.1016/j.biortech.2011.12.059
M3 - Journal article
C2 - 22227144
AN - SCOPUS:84855403002
SN - 0960-8524
VL - 126
SP - 425
EP - 430
JO - Bioresource Technology
JF - Bioresource Technology
ER -