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KMID : 1171820050200020064
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Journal of Environmental and Sanitary Engineering
2005 Volume.20 No. 2 p.64 ~ p.75
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A Study on Anaerobic Treatment and Energy Recovery Technology of Food Waste by Using Hybrid Anaerobic Reactor
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Yoon Young-Bong
Park Jin-Young
Ju Jin-Young
Kim Myung-Ho
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Abstract
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The total production of food waste was about 11 ,398ton/day(’ 03) in Korea. Also, food waste was treated by landfill, incineration, reuse and anaerobic digestion. The method of food waste treatment depended primarily on landfill. However, the method of landfill causing social problems was prevented to treat food waste in the first of January 2005.12)
Thus, anaerobic digestion is an important method to treat food waste because of possibility of energy recovery as methane gas. In this study, the possibility of food waste treatment containing high organic material and low pH in the one stage anaerobic reactor to save cost and time and energy recovery using ca gas by the hybrid anaerobic reactor (HAR) was measured. The HAR was designed by combing the merits of the anaerobic filter (AF) to minimize the microorganism shock when food waste of very low pH was injected and up-flow anaerobic sludge blanket (UASB) to prevent from plugging and channeling phenomena by large suspended solids when semi solids were injected. Granule was packed in the section of HAR. The purpose of the BMF experiment was to measure the amount of methane generated when organic material was resolved under anaerobic conditions, to grasp bio resolution of organic material. Total accumulated methane production per VS amount was 0.47(㎥/㎏ VS). So, the value was about 81.2% of theoretical methane production which was 0.58(㎥/㎏ VS) by elementary analysis and organic matter removal velocity (K) was 0.18(d-¹). From these results, food waste was treated by anaerobic treatment. From this study, CH₄ generation from food waste (11,398 ton/day) could be estimated. By using an energy conversion factor of Braun’s study, 5.97㎾h/㎥ CH₄, 60% of ca gas generation, the amount of total energy producing food waste is to 6,727㎿h/day. It could be confirmed that energy recovery using CH₄ gas was possible. Above these results, food waste containing organic matters of high concentration could be treated in HRT 30 days under an anaerobic condition, using the hybrid anaerobic reactor and reuse of ca gas was possible.
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