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Function of Microbial Electrochemical Technology in Anaerobic Digestion using Sewage Sludge

하수슬러지를 이용한 혐기성소화조에서 미생물 전기화학기술의 역할

Tian, Dongjie;Lee, Beom;Park, Jungye;Jun, Hangbae
전동걸;이범;박준규;전항배

  • Received : 2016.03.18
  • Accepted : 2016.04.29
  • Published : 2016.05.30

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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