Understanding electricity generation in osmotic microbial fuel cells through integrated experimental investigation and mathematical modeling
By Mohan Qin and Qingyun Ping and Yaobin Lu and Ibrahim M. Abu-Reesh and Zhen He
Published in Bioresource Technology
NULL
2015
Abstract
Osmotic microbial fuel cells (OsMFCs) are a new type of \MFCs\ with integrating forward osmosis (FO). However, it is not well understood why electricity generation is improved in OsMFCs compared to regular MFCs. Herein, an approach integrating experimental investigation and mathematical model was adopted to address the question. Both an OsMFC and an \MFC\ achieved similar organic removal efficiency, but the OsMFC generated higher current than the \MFC\ with or without water flux, resulting from the lower resistance of \FO\ membrane. Combining NaCl and glucose as a catholyte demonstrated that the catholyte conductivity affected the electricity generation in the OsMFC. A mathematical model of OsMFCs was developed and validated with the experimental data. The model predicated the variation of internal resistance with increasing water flux, and confirmed the importance of membrane resistance. Increasing water flux with higher catholyte conductivity could decrease the membrane resistance.
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