Influence of MLSS Concentration and Aspergillus niger on Microbial Fuel Cell Performance and Wastewater Treatment Efficiency

Aims: In this study, we evaluated the performance of direct microbial fuel cells using citric acid wastewater as a substrate under different concentrations of MLSS ۱۰۰۰ mg.L-۱ and ۳۰۰۰ mg.L-۱.  Materials & Methods: Aspergillus niger yeast was used as a microorganism over ۴ days and nights of this experiment. A Nafion membrane was used for proton transfer, and graphite plates were used for electron transfer. COD removal efficiency, maximum open circuit voltage, power, and current density were evaluated.  Findings: The general trend of energy production and removal efficiency showed that energy production increased with increasing MLSS. The maximum of these variables was recorded for MLSS of ۳۰۰۰ mg.L-۱, achieving a removal efficiency of ۹۳%, an open circuit voltage of ۵۰۰ mV, and power and current density of ۲۴۳۴۵ µW.m-۲ and ۴۴۴ mA.m-۲, respectively.  Conclusion: Our results showed that the designed MFC suits wastewater treatment and energy recovery.

کلیدواژه ها:

Aspergillus niger ، Citric acid ، Microbial Fuel Cell ، Wastewater treatment