Continuous treatment of high strength wastewaters using air-cathode microbial fuel cells

Kyoung Yeol Kim, Wulin Yang, Patrick J. Evans, Bruce E. Logan

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Treatment of low strength wastewaters using microbial fuel cells (MFCs) has been effective at hydraulic retention times (HRTs) similar to aerobic processes, but treatment of high strength wastewaters can require longer HRTs. The use of two air-cathode MFCs hydraulically connected in series was examined to continuously treat high strength swine wastewater (7–8 g/L of chemical oxygen demand) at an HRT of 16.7 h. The maximum power density of 750 ± 70 mW/m2 was produced after 12 days of operation. However, power decreased by 85% after 185 d of operation due to serious cathode fouling. COD removal was improved by using a lower external resistance, and COD removal rates were substantially higher than those previously reported for a low strength wastewater. However, removal rates were inconsistent with first order kinetics as the calculated rate constant was an order of magnitude lower than rate constant for the low strength wastewater.

Original languageEnglish (US)
Pages (from-to)96-101
Number of pages6
JournalBioresource technology
Volume221
DOIs
StatePublished - Dec 1 2016

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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