Recovery of silver from wastewater coupled with power generation using a microbial fuel cell.

A cost-effective microbial fuel cell (MFC) system was developed in order to recover silver metal from silver ion containing wastewaters. After 8h reaction, silver metal recovery efficiencies as high as 99.91 ± 0.00%-98.26 ± 0.01% were achieved. The initial concentrations were from 50 ppm to 200 ppm with a load resistor of 1000 Ω. In the batch-fed cathode and continuous-fed anode system with an initial silver concentration of 200 ppm, discharge curves display the production of both silver metal and electric energy at a rate of 69.9 kg silver per KWh energy output. The maximum power of about 4.25 W/m(2), maximum voltage of 0.749 V, maximum current density of 5.67 A/m(2), and a fill factor of 0.626 were achieved at 1000 ppm initial silver ion concentration.

[1]  J. R. Kramer,et al.  Reprint of "Chronic toxicity of silver nitrate to Ceriodaphnia dubia and Daphnia magna, and potential mitigating factors". , 2007, Aquatic toxicology.

[2]  Sang J. Chung,et al.  Electrochemical recovery of silver from waste aqueous Ag(I)/Ag(II) redox mediator solution used in mediated electro oxidation process , 2009 .

[3]  S. Aktaş.  Silver recovery from spent silver oxide button cells , 2010 .

[4]  Tingyue Gu,et al.  A state of the art review on microbial fuel cells: A promising technology for wastewater treatment and bioenergy. , 2007, Biotechnology advances.

[5]  Colin Vincent,et al.  Modern Batteries , 1984 .

[6]  Bruce E. Logan,et al.  Microbial Fuel Cells , 2006 .

[7]  B. Lim,et al.  Removal of Hg2+ as an electron acceptor coupled with power generation using a microbial fuel cell. , 2011, Bioresource technology.

[8]  J. Proost,et al.  Kinetic transitions during Ag and Cu electrorecovery on reticulated vitreous carbon electrodes in flow-by mode , 2010 .

[9]  N. Das,et al.  Recovery of precious metals through biosorption: A review , 2010 .

[10]  M. Kitis,et al.  The recovery of silver from mining wastewaters using hybrid cyanidation and high-pressure membrane process , 2009 .

[11]  D. Afzali,et al.  Separation of trace amount of silver using dispersive liquid-liquid based on solidification of floating organic drop microextraction. , 2011, Analytica chimica acta.

[12]  M H Osman,et al.  Recent progress and continuing challenges in bio-fuel cells. Part I: enzymatic cells. , 2011, Biosensors & bioelectronics.