화학공학소재연구정보센터
Bioresource Technology, Vol.102, No.9, 5541-5544, 2011
The effect of electrodialytic treatment and Na(2)H(2)EDTA addition on methanogenic activity of copper-amended anaerobic granular sludge: Treatment costs and energy consumption
The effect of electrodialytic treatment in terms of a current density, pH and Na(2)H(2)EDTA addition on the methanogenic activity of copper-amended anaerobic granular sludge taken from the UASB reactor from paper mill was evaluated. Moreover, the specific energy consumption and simplified operational and treatment costs were calculated. Addition of Na(2)H(2)EDTA (at pH 7.7) to copper-amended sludge resulted in the highest microbial activity (62 mg CH4-COD g VSS-1 day(-1)) suggesting that Na(2)H(2)EDTA decreased the toxic effects of copper on the methanogenic activity of the anaerobic granular sludge. The highest methane production (159 %) was also observed upon Na(2)H(2)EDTA addition and simultaneous electricity application (pH 7.7). The energy consumption during the treatment was 560, 840, 1400 and 1680 kW h m(-3) at current densities of 0.23, 0.34, 0.57 and 0.69 mA cm(-2), respectively. This corresponded to a treatment costs in terms of electricity expenditure from 39.2 to 117.6 epsilon per cubic meter of sludge. (C) 2010 Elsevier Ltd. All rights reserved.