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Author(s): |
Biao Wang, College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
Xinhua Chen, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Fangcheng Xu, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
Wei Wang, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Xiaojin Xiong, College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China |
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Abstract: |
The influences of substrate, concentration and salinity on electricity production in MFCs were investigated. Deep-sea exoelectrogenic bacterium Shewanella sp. DS1 could not utilize acetate and glucose, but could utilize lactate as substrate for current production. The optimal concentration of lactate was 5 mmol/L with a maximum voltage 200 mV, relevant power density 16.87 mW/m2 and coulombic efficiency (CE) 37.4%. With higher lactate concentration (i.e., 20 mmol/L), CE was reduced by 56.7% while the maximum voltage not affected. Salinity tests showed that DS1 could produce current in a wide salinity range (1-7% NaCl). Power density and CE firstly increased with the NaCl concentration, and then decreased with it. A maximum voltage of 202 mV and a relevant power density of 17.21 mW/m2 were achieved at optimal NaCl concentration (3%). It seemed that DS1 has higher power and CE yields under high NaCl concentration is probably because DS1 is an exoelectrogenic bacterium isolated from deep-sea sediment. DS1 has potential application in high salinity wastewater treatment, such us dye wastewater, with some green bio-electricity reclaimed.
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