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http://dx.doi.org/10.15681/KSWE.2019.35.4.332

Comparison of Anaerobic Digestion Efficiency with Different Temperature of Food Wastes  

Hwang, Kwanghyun (Building Science Research Team, GS E&C Research institute)
Kim, Dongik (Department of Civil, Environmental and Architectural Engineering, Korea University Graduate School)
Publication Information
Journal of Korean Society on Water Environment / v.35, no.4, 2019 , pp. 332-339 More about this Journal
Abstract
A comparative study on the anaerobic digestion efficiency according to the temperature change was conducted considering the characteristics of domestic food wastes with high water content of about 80 % or more. The substrate was tested for anaerobic digestion efficiency in two substrates, a liquid component separated naturally from food waste and food waste itself. In the anaerobic digestion experiments, the digestion efficiency was the highest at $55^{\circ}C$ (thermophilic temperature). However, the digestion efficiency at $45^{\circ}C$(middle high temperature) was lower than that at $35^{\circ}C$(mesophilic temperature). The comparison of general food wastes anaerobic digestion requiring 30 days of hydraulic retention time to the liquid component indicated a stable digestion efficiency even after 15 days of hydraulic retention time.In the experiments conducted on food waste, the digestion efficiency at $55^{\circ}C$ was higher than that at $35^{\circ}C$. When the food waste, especially the liquid component originating from food waste, is treated by anaerobic digestion method, the mesophilic temperature and thermophilic temperature conditions are more favorable in the digestion efficiency than the middle high temperature ($45^{\circ}C$). However, when applying thermophilic or mesophilic temperature anaerobic digestion process operation in the field, the amount of energy input should be considered.
Keywords
Anaerobic digestion; Biogas; Food wastes; Mesophilic; Thermophilic;
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