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A constructed wetland-microbial fuel cell system effectively removes Cr(VI) from wastewater and generates electricity, with optimal operating parameters including a COD concentration of 300 mg/dm³, Cr(VI) concentration of 80 mg/dm³, and hydraulic retention time of 3 days.

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Representative tubular / upflow MFC — matched on the paper’s reported configuration, not its exact geometry.

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Reported parameters

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What they did

System
MFC
Substrate
synthetic mixture
Inoculum
mixed culture from anaerobic sludge (Liquan Brewery, Guilin) acclimated for 1 week. Dominant electrogenic bacteria Geobacter and metal dissimilatory reducing bacteria Acinetobacter detected.

What worked

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Abstract

A new type of bioelectrochemical system features a constructed wetland (CW) coupled with a microbial fuel cell (MFC) to treat Cr(VI) wastewater while generating electricity. The optimal operating parameters for treating wastewater containing Cr(VI) are discussed. The results show that the CW-MFC system is more effective in the treatment of Cr(VI)-containing wastewater and generating electricity. A COD concentration of 300 mg/dm 3 corresponded to the greatest COD and Cr(VI) removal rates with a maximum power density of 505.62 mW/m 3 , whereas a Cr(VI) concentration of 80 mg/dm 3 yielded the greatest COD removal rate, with a maximum power density of 484.43 mW/m 3 . A hydraulic retention time (HRT) of 3 days yielded the largest pollutant removal rates with a maximum power density of 479.21 mW/m 3 . Considering that the comprehensive operating conditions of CW-MFC are based on planting plants, the COD concentration is 300 mg/dm 3 , the Cr(VI) concentration is 80 mg/dm 3 , and the HRT is 3 days. The abundance of electrogenic bacteria Geobacter and metal dissimilatory reducing bacteria Acinetobacter in CW-MFC is higher than that in the control group. The results of this study provide theoretical guidance for determining the optimal operating conditions and energy recovery of the CW-MFC system for treating chromium wastewater.

Key findings

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Keywords

Microbial fuel cellWastewaterConstructed wetlandWetlandEnvironmental engineeringSewage treatment

Identifiers

DOI
10.37190/epe240203
Journal
Environment Protection Engineering
Year
2023