The effect of electrodialytic treatment and Na2H2EDTA 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 pH7.7) to copper-amended sludge resulted in the highest microbial activity (62 mg CH(4)-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 (pH7.7). 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 € per cubic meter of sludge.
Department of Environmental Sciences, University of Eastern Finland, Yliopistonranta 1E, 70211 Kuopio, Finland. Virkutyte.Jurate@epa.gov
Jurate
J
Virkutyte
Ekaterina
E
Rokhina
Piet
P
Lens
Veeriah
V
Jegatheesan
D000693:Anaerobiosis; D003300:Copper / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D004560:Electricity; D055664:Electrochemical Techniques / Q000191:economics / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000032:analysis*; D012722:Sewage / Q000382:microbiology*; D013816:Thermodynamics; D018508:Water Purification / Q000191:economics* / Q000379:methods*
D012722:Sewage; D003300:Copper; D004492:Edetic Acid; D008697:Methane