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http://dx.doi.org/10.5338/KJEA.2006.25.3.247

Effects of Mixing Ratio and Organic Loading Rate of Acid Fermented Food Wastes and Sewage Sludge on the Anaerobic Digestion Process  

Ahn, Chul-Woo (Korea National Parks Authrority)
Park, Jin-Sik (Dept. of Health & Environmental, Kyungwoon University)
Jang, Seong-Ho (Dept. of Environmental System Engineering, Pusan National University)
Publication Information
Korean Journal of Environmental Agriculture / v.25, no.3, 2006 , pp. 247-256 More about this Journal
Abstract
This study has been conducted for the process of food wastes disposal using surplus capacity of established sewage treatment plant by co-digestion of fermented food wastes and sewage sludge after thermophilic acid fermentation of food wastes. The co-digestion of thermophilic acid fermented food wastes and sewage sludge was performed by semi-continous method in mesophilic anaerobic digestion reactor. It showed great digestion efficiency as the average SCOD and VS removal efficiency in organic loading rate 3.30g VS/L.d. were 74.2% and 73.6%, and the gas production rate and average methane content were 0.440 L/g $VS_{add}.d$ and 66.5%, respectively. Based on the results of this study, the co-digestion of thermophilic acid fermented food wastes and sewage sludge in sewage treatment plant is able to improve treatment efficiency of anaerobic digestion reactor and to dispose food wastes simultaneously, and was proved excellent economical efficiency comparing with any other treatment methods.
Keywords
OLR (Organic loading rate); Acid fermentation; Mixing ratio; Food waste; Sewage sludge; Anaerobic co-digestion;
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