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Exoelectrogenic response of Pichia fermentans influenced by mediator and reactor design

Pal, Mamta, Sharma, Rakesh Kumar
Journal of bioscience and bioengineering 2019 v.127 no.6 pp. 714-720
Pichia fermentans, clean energy, cost effectiveness, electric potential, electricity generation, methylene blue, microbial fuel cells
Microbial fuel cell is one of the most convenient and cost-effective technology for producing the clean energy. This study explores the exoelectrogenic behavior of Pichia fermentans in a microbial fuel cell. Two different reactor designs (double- and single-chambered) were tested in the presence and in the absence of a mediator (methylene blue). The influence of extracellular polymeric substances in the electricity generation has also been studied. In a double-chambered setup, maximum open circuit voltages were measured as 0.602 and 0.488 V with mediator and without mediator cell, respectively, whereas maximum power densities were measured as 1.23 μWcm−2 and 0.407 μWcm−2, respectively. In addition, maximum open circuit voltages were observed as 0.40 and 0.397 V in a single-chambered fuel cell with and without mediator, respectively. The maximum power density was recorded 1.64 μWcm−2 in the presence of a mediator, whereas the same was found as 0.643 μWcm−2 in the absence of mediator. Thus, these results indicate that P. fermentans has the ability to produce high power density under microaerophilic conditions with mediator in a single-chambered membrane less setup.