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

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 initia...

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Bibliographic Details
Published in:Bioresource technology 2011-02, Vol.102 (4), p.3702-3708
Main Authors: Xu, Su Yun, Lam, Hoi Pui, Karthikeyan, O. Parthiba, Wong, Jonathan W.C.
Format: Article
Language:English
Subjects:
Acids - chemistry
Anaerobiosis
Ashes
Biological and medical sciences
Bioreactors
Biotechnology - methods
Bottom ash
Bulking agents
Equipment Design
Fatty acids
Fatty Acids, Volatile - chemistry
Food industries
Food Industry - methods
Food waste
Foods
Fundamental and applied biological sciences. Psychology
Gases
Hydrogen-Ion Concentration
Hydrolysis
Hydrolysis/acidogenesis
Industrial Waste
Leach bed reactor
Methane
Methane - chemistry
Reactors
Sewage - chemistry
Sludge
Use and upgrading of agricultural and food by-products. Biotechnology
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Wastes
Water Pollutants, Chemical - analysis
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Summary: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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2010.11.095