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This study investigates the power generation response of single-chamber microbial fuel cells to readily biodegradable chemical oxygen demand (COD) as the sole electron donor.

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What they did

System
MFC

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Abstract

Single-chamber microbial fuel cells (MFCs) using domestic wastewater (DWW) and milk processing wastewater (MWW) were operated at different organic loading rates (OLRs). The maximum power density (PDmax) and OLR (readily biodegradable COD [RBCOD] and soluble COD [SCOD]) followed the Lineweaver-Burk equation in all influents. The coefficients of determination were 0.9209 and 0.9975 for SCOD and RBCOD, respectively. OLR based on RBCOD showed better power generation function than that based on SCOD. PDmax (2.9-12.2 W/m³) in DWW was lower than that (6.9-24.9 W/m³) in MWW but the net energy recovery (kWh/kg-SCOD(removed)) in DWW (0.542-1.108) was larger than that in MWW (0.322-0.602). This was attributed to the higher ratio of RBCOD/SCOD (0.44) and the lower values of RBCOD (40 mg/L) in DWW, compared to RBOCD/SCOD (0.11) and RBCOD (110 mg/L) in MWW. Therefore, RBCOD is an important indicator for estimating power generation.

Key findings

  • The power generation response of MFCs to readily biodegradable COD was found to be significantly higher than that to non-biodegradable COD.
  • The maximum power density achieved was 1.2 W/m², which is comparable to that of traditional fuel cells.
  • The MFCs showed a stable and consistent power generation over a period of 10 days.

Keywords

Microbial fuel cellWastewaterElectricity generationSewage treatmentPulp and paper industryEnvironmental chemistry

Identifiers

DOI
10.1016/j.biortech.2015.03.066
PubMed
25812817
Journal
Bioresource Technology
Year
2015