PubAg

Main content area

Food waste treatment with a leachate bed reactor: Effects of inoculum to substrate ratio and reactor design

Author:
Xiong, Ziyi, Hussain, Abid, Lee, Hyung-Sool
Source:
Bioresource technology 2019 v.285 pp. 121350
ISSN:
0960-8524
Subject:
biorefining, chemical oxygen demand, energy balance, food waste, hydrogen production, hydrolysis, inoculum, leachates, waste treatment
Abstract:
This study evaluated the effects of different inoculum to substrate ratios (ISRs) (5, 10, 15%) on hydrolysis and acidogenesis of food waste in a conventional leachate bed reactor (LBR-C) and a novel fractionalized LBR (LBR-F). At ISR of 10%, LBR-C experienced clogging and thus the solid removal and VFA production reduced significantly. Without any clogging events at high ISR of 10%, LBR-F achieved significantly higher (p < 0.05) VS removal of 91%, hydrolysis yield of 837 g cumulative sCOD/kg volatile solids (VS), and VFA yield of 669 g COD/kg VS. Hydrogen yield was as high as 20 m3/ton food waste in LBR-F. Energy balance indicated that the LBR-F can be energy-positive for food waste treatment with net energy benefit of ∼8 kWh/ton food waste treated. Considering the high VFA yield, the LBR-F can also be a promising food waste fermentation system for the biorefinery platform.
Agid:
6374726