Abstract:
:A self-recirculation electrolyte system driven by air bubble buoyancy force is proposed for unbuffered microbial fuel cells (MFC) in this study. It was demonstrated that the electrolyte recirculation rate increased with the aeration rate in a certain range. Compared with buffer condition, buffer-less condition resulted in a 10%∼20% lower voltage (14.2% lower maximum power density) but a 9.1% higher Coulombic efficiency (CE) at an aeration rate of 92.0ml/min. Under buffer-less condition, increasing the aeration rate resulted in a higher voltage output, a higher COD removal, and a higher CE due to the enhanced proton transfer and increased oxygen for cathode reaction. However, an extra high aeration rate induced a rapid deterioration of anode performance due to the excessive oxygen transfer into anode. This study demonstrates that the self-recirculation electrolyte system could be helpful for future unbuffered MFC designs.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Zhang L,Zhu X,Li J,Fu Q,Liao Q,Li Y,Li Ydoi
10.1016/j.biortech.2017.05.178subject
Has Abstractpub_date
2017-10-01 00:00:00pages
1173-1177eissn
0960-8524issn
1873-2976pii
S0960-8524(17)30846-5journal_volume
241pub_type
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