Journal
BIORESOURCE TECHNOLOGY
Volume 110, Issue -, Pages 245-250Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.01.095
Keywords
Microbial fuel cell; Miniature; Cascade; Stack; Wastewater treatment
Funding
- Wessex Water
- Great Western Research [322]
- EPSRC [EP/I004653/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I004653/1] Funding Source: researchfish
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Seven miniature microbial fuel cells (MFCs) were hydraulically linked in sequence and operated in continuous-flow (cascade). Power output and treatment efficiency were investigated using varying organic loads, flow-rates and electrical configurations. When fed synthetic wastewater low in organic load (1 mM acetate) only the first MFC operated stably over a 72-h period. Acetate feedstock at 5 mM was enough to sustain the first four MFCs, and 10 mM acetate was sufficient to maintain all MFCs at stable power densities. COD was reduced from 69 to 25 mg/L (64%, 1 mM acetate), 319-34 mg/L (90%, 5 mM acetate) and 545-264 mg/L (52%, 10 mM acetate). Fluctuating flow-rates improved performance in downstream MFCs. When connected electrically in parallel, power output was two-fold and current production 10-fold higher than when connected in series. The results suggest cascades of MFCs could be employed to complement or improve biological trickling filters. (C) 2012 Elsevier Ltd. All rights reserved.
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