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Treatment of Food Waste Leachate using Lab-scale Two-phase Anaerobic Digestion Systems  

Heo, Ahn-Hee (Department of Environmental Engineering, Inha University)
Lee, Eun-Young (Department of Environmental Engineering, Inha University)
Kim, Hee-Jun (Department of Environmental Engineering, Inha University)
Bae, Jae-Ho (Department of Environmental Engineering, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.30, no.12, 2008 , pp. 1231-1238 More about this Journal
Abstract
This study was performed to evaluate the treatability of food waste leachate using lab-scale two-phase anaerobic digestion system. Effects of influent pH, hydraulic retention time (HRT), and recycle of methanogenic reactor effluent to the thermophilic acidogenic reactors were investigated. For methanogenic reactors, effects of internal solids recycle and temperature were studied. Performance of the acidogenic reactors was stable under the conditions of influent pH of 6.0 and HRT of 2 d with the recycle of methanogenic reactor effluent, and acidification and VS removal efficiency were about 30% and 40%, respectively. Up to the organic loading rate (OLR) of 7 g COD/L/d, effluent SCOD values of mesophilic and thermophilic methanogenic reactors either lower or kept the same with the internal solids recycle. Also, decreasing tendency in specific methane production (SMP) due to the organic loading increase became diminished with the internal solids recycle. Mesophilic methanogenic reactors showed higher TCOD removal efficiency and SMP than thermophilic condition under the same OLR as VSS was always higher under mesophilic condition. In sum, thermophilic acidogenesis-mesophilic methanogenesis system was found to be better than thermophilic-thermophilic system in terms of both organic removal and methane production.
Keywords
Food Waste Leachate; Two-phase Anaerobic Digestion; Thermophilic; Mesophilic;
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