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Influence of Sludge Age on the Performance of a Cyclically Fed Microbial Fuel Cell Using Glycerol from Biodiesel
Author(s) -
Costa Santos J. B.,
Silva de Barros V. V.,
Linares J. J.
Publication year - 2018
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201800089
Subject(s) - microbial fuel cell , biodiesel , pulp and paper industry , population , organic matter , chemistry , glycerol , acidogenesis , microbial population biology , biodiesel production , food science , bacteria , anode , biology , biochemistry , organic chemistry , anaerobic digestion , demography , electrode , methane , sociology , genetics , engineering , catalysis
This study focuses on the influence of sludge age (SA) on the production of electricity from a cyclically fed glycerol–based microbial fuel cell. Under the same hydraulic retention time, different volumes of sludge were extracted from the anode compartment, thereby modifying the SA. Such changes affect the electrochemical performance, the organic matter biodegradation and consequently, the coulombic efficiency. A sludge volume of 0.01 L (corresponding to a SA of 24 d) appears to be optimal, because this favors the development of electricity–generating microorganisms (EGM). Shorter SA times wash EGM out of the system and promote growth of the fermenter (mainly acidogenic bacteria), whereas a longer SA reduces the microbial population. A final product analysis identified that short SAs provide favorable conditions in which higher concentrations of short–chain organic acids are detected.