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http://dx.doi.org/10.4491/KSEE.2014.36.5.303

Slurry Phase Decomposition of Food Waste by Using Various Microorganisms  

Kwon, Bum Gun (Gyeongnam Department of Environmental Toxicology and Chemistry, Korea Institute of Toxicology)
Na, Suk-Hyun (Department of Environment and Energy Engineering, Chonnam National University)
Lim, Hye-Jung (Department of Environment and Energy Engineering, Chonnam National University)
Lim, Chae-Sung (Department of Environment and Energy Engineering, Chonnam National University)
Chung, Seon-Yong (Department of Environment and Energy Engineering, Chonnam National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.36, no.5, 2014 , pp. 303-310 More about this Journal
Abstract
This study investigated the reduction of food waste through the slurry phase decomposition in a source of food waste by microorganisms. The reactor used in the experiment was composed of both woodchip with wood material and sponges with polyurethane material as media of attached microorganisms, and food waste was mixed with a constant cycle consisted of a stirring device. During the experimental period of 100 days, the change in weight over the cumulative total amount of food waste added was reduced by 99%. Approximately, 1% of the residual food waste could be inherently recalcitrant materials (cellulose, hemicellulose, lignin, etc.) and thus was thought to be the result of the accumulation. The initial pH in wastewater generated from food waste was low with 3.3 and after 24 hours treatment this pH was increased to 5.8. The concentrations of COD, BOD, SS, salinity, TN and TP were gradually decreased. Food waste decay was proceeded by the seven species microorganisms identified and confirmed in this study, making a slurry phase and thus reducing residual food wastes. In the initial phase, the microbial population was approximately $3.3{\times}10^4$ cell/mL, and after 15 days this population was a constant with $5.1{\times}10^6$ cell/mL which means a certain stabilization for the reduction of food wastes. From these results, it can be considered that organic matter decomposition as well as the weight loss of food wastes by microorganisms is done at the same time.
Keywords
Food Waste; Slurry Phase Decomposition; Reduction; Microorganism; Stabilization;
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Times Cited By KSCI : 5  (Citation Analysis)
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