NDLI: Neutral red as a mediator for the enhancement of electricity production using a domestic wastewater double chamber microbial fuel cell

Content Provider	Springer Nature Link
Author	Fathey, Reham Gomaa, Ola M. Ali, Amr El Hag Kareem, Hussein Abd Zaid, Mohamed Abou
Copyright Year	2015
Abstract	Neutral red is an electron transport compound that is used in bacteria as a mediator for decolorization, degradation of different organic compounds and in electricity production using microbial fuel cells (MFCs). In this study, bacterial electron transport was followed by monitoring electricity production in a double chamber microbial fuel cell, and measured as current (mA). To enhance electron transfer and consequently increase electricity production, neutral red was added as a mediator. The optimal concentration that had minimal effect on bacterial growth was 15 mM. Spiking the culture with this concentration resulted in a maximal current of 1.36 mA and a power intensity that reached 467.6 mW/m$^{2}$over 120 h, as compared to 0.74 mA and 209.5 mW/m$^{2}$ over a period of just 24 h as a control. This was also confirmed by the increase in initial bacterial conductivity measured in the presence of neutral red as compared to low initial conductivity in the absence of a mediator. To prove that the process of electricity production is correlated to electron transfer, azole and azide were both used to inhibit membrane cytochrome complexes. The results showed a sharp decrease in electrical current production within less than 24 h, suggesting that the process takes place via membrane protein cytochromes. The predominant microorganism present under all previously mentioned conditions was Buttiauxella agrestis SW-1 (GenBank ID KP770022) as identified using 16S rRNA phylogenetic analysis, this bacterium was also studied morphologically to detect micropilli. Protein profiles of the membrane showed a distinct band close to that reported for cytochrome c; nevertheless, further investigation is required to highlight both its nature and its role.
Starting Page	695
Ending Page	702
Page Count	8
File Format	PDF
ISSN	15904261
Journal	Annals of Microbiology
Volume Number	66
Issue Number	2
e-ISSN	18692044
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-09-29
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Electron transport Microbial fuel cell Domestic wastewater Mediator Neutral red Electricity production Microbiology Microbial Genetics and Genomics Microbial Ecology Mycology Medical Microbiology Applied Microbiology
Content Type	Text
Resource Type	Article
Subject	Applied Microbiology and Biotechnology

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