| Title |
Function of Microbial Electrochemical Technology in Anaerobic Digestion using Sewage Sludge |
| Authors |
전동걸 ( Dong Jie Tian ) ; 이범 ( Beom Lee ) ; 박준규 ( Jun Gye Park ) ; 전항배 ( Hang Bae Jun ) |
| DOI |
https://doi.org/10.15681/KSWE.2016.32.3.297 |
| Keywords |
Alkalinity; Anaerobic digestion; Biogas; Methane; Microbial electrochemical technology |
| 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/gㆍCODre in AD and 0.25L-CH4/gㆍCODre 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 VSㆍd and 0.35 mg SCOD/mg VSㆍd, 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. |