Tarbiat Modares University (TMU) ECOPERSIA 2322-2700 12 4 2024 12 01 Influence of MLSS Concentration and Aspergillus niger on Microbial Fuel Cell Performance and Wastewater Treatment Efficiency 379 389 17413 DOI: 10.22034/ECOPERSIA.12.4.379 EN Mina Sarvary Korojdeh Hakim Sabzevari University Mojtaba Hadavifar Hakim Sabzevari University Noushin Birjandi Lorestan University Roya Mehrkhah Michigan Technology Co., Ltd, Techno B-502, Ulsan Technopark, Jonggaro 15, Junggu, Ulsan 44412, South Korea Qin Li Professor at School of Engineering and Built Environment, Griffith University, Nathan, Australia Journal Article 1970 01 01 <strong>Aims:</strong> In this study, we evaluated the performance of direct microbial fuel cells using citric acid wastewater as a substrate under different concentrations of MLSS 1000 mg.L-1 and 3000 mg.L-1. <br><br>Materials & Methods: Aspergillus niger yeast was used as a microorganism over 4 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. <br><br><strong>Findings:</strong> 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 3000 mg.L-1, achieving a removal efficiency of 93%, an open circuit voltage of 500 mV, and power and current density of 24345 µW.m-2 and 444 mA.m-2, respectively. <br><br><strong>Conclusion:</strong> Our results showed that the designed MFC suits wastewater treatment and energy recovery. https://ecopersia.modares.ac.ir/article_17413_dc35d16f1f21e67c18ea9f1f9c16775a.pdf