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Waste Management & Research
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Comparative performance between temperaturephased and conventional mesophilic two-phased processes in terms of anaerobically produced bioenergy from food waste

Jong-Ho Youn

Department of Environmental Information and Engineering, Shinsung College, 49, Duckma-ri, Jungmi-myun, Dangjin-gun, Chungnam, 343–861, Korea. Tel: +82 41 350 1253; fax: +82 41 350 1125 younjh{at}shinsung.ac.kr

Hang-Sik Shin

Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology,, Daejeon, Korea

Comparative evaluation of bioenergy production from food waste was carried out with both a temperature-phased and a conventional mesophilic two-phased process at different organic loading rates (OLRs). No methane was detected in the temperature-phased thermophilic-acidogenic fermenter at all the OLRs tested. However, a significant amount of methane content was detected in the conventional two-phased mesophilicacidogenic fermenter, with increments depending on the organic loading rate [from 17% at 3 g VS L – 1 day – 1 to 25% at 8 g VS L – 1 day – 1 (VS, volatile solid)]. Acetate and butyrate were the main volatile fatty acids (VFAs) in the temperaturephased thermophilic-acidogenic fermenter; conversely propionate was a major VFA in the conventional two-phased mesophilicacidogenic fermenter. Through the chemical oxygen demand (COD) balance of both temperature-phased and conventional mesophilic two-phased processes, the fraction of the feed-COD converted to the hydrogen-COD in the thermophilicacidogenic fermenter within the former process was estimated from 7.9 to 9.3%, with a peak at ORL of 6 g VS L – 1 day – 1, whereas it was quantified from 0.3 to 0.9% in the mesophilicacidogenic fermenter within the latter one. Moreover, the fraction of the feed-COD converted to the methane-COD in the mesophilic-acidogenic fermenter within the conventional twophased process ranged from 5.4 to 7.9%. On the other hand, conversion of the feed-COD to the methane-COD in the mesophilicmethanogenic fermenter of both temperature-phased and conventional mesophilic two-phased processes ranged from 66.2 to 72.3% and from 63.5 to 70.5%, respectively, with decrements related to the increase of organic loading rate.

Key Words: Food waste • hydrogen production • methane production • volatile fatty acids • wmr 752–6

Waste Management & Research, Vol. 23, No. 1, 32-38 (2005)
DOI: 10.1177/0734242X05049766
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