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http://dx.doi.org/10.15681/KSWE.2016.32.3.297

Function of Microbial Electrochemical Technology in Anaerobic Digestion using Sewage Sludge  

Tian, Dongjie (JEONGBONG CO.LTD.)
Lee, Beom (Chungbuk National University)
Park, Jungye (Chungbuk National University)
Jun, Hangbae (Chungbuk National University)
Publication Information
Journal of Korean Society on Water Environment / v.32, no.3, 2016 , pp. 297-302 More about this Journal
Abstract
Microbial electrochemical technology (MET) has recently been studied to improve the efficiency of a traditional anaerobic digestion (AD). The purpose of this study was to investigate the impact of MET in the system when MET was combined with traditional AD (i.e., AD-MET). Electrodes used in the MET were Cu coated graphite electrodes. They were supplied with a voltage of 0.3 V. AD started to generate methane in 80 days. But AD-MET started to generate methane from the initial operation after the system started. It was observed that AD-MET reached steady state faster and produced higher methane yield than AD. During the steady state, the average daily methane productions in AD and AD-MET were 2.3L/d and 4.9L/d, respectively. Methane yields were 0.07-CH4/g‧CODre in AD and 0.25L-CH4/g‧CODre in AD-MET. In AD-MET, the production rates of total volatile fatty acids (TVFAs) and soluble chemical oxygen demand (SCOD) were 0.12 mg TVFAs/mg VS‧d and 0.35 mg SCOD/mg VS‧d, respectively. They were significantly (p < 0.05) higher than those in AD. However, the concentrations of residual TVFAs in both systems were not significantly (p > 0.05) different from each other, confirming that methane conversion in AD-MET was greater than that in AD.
Keywords
Alkalinity; Anaerobic digestion; Biogas; Methane; Microbial electrochemical technology;
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Times Cited By KSCI : 1  (Citation Analysis)
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