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This study evaluates the integration of microbial fuel cells (MFCs) into vertical subsurface flow constructed wetlands (VSSF) for simultaneous wastewater treatment and electricity generation. Two laboratory-scale systems were operated in parallel: a control VSSF and an MFC-integrated VSSF-MFC. Results demonstrate that MFC integration enhances COD removal (94.2% vs 89.4%) and NH₄⁺-N removal (93.2% vs 88.4%) without adverse effects on treatment capacity. The integrated system generated a maximum power density of 4.75 mW/m² at stage I, increasing to 10.32 mW/m² at stage II with higher organic loading rates.

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Single-chamber air-cathode MFCRepresentative model
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Representative single-chamber air-cathode MFC — matched on the paper’s reported configuration, not its exact geometry.

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What they did

System
MFC
Substrate
real wastewater
Inoculum
mixed culture

What worked

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Abstract

The combination of constructed wetlands (CWs) and microbial fuel cells (MFCs) has emerged in recent years with the purpose of enhancing wastewater treatment efficiency of CWs while simultaneously generating electricity. Taking the above into account, the aim of this study is to evaluate the influence of MFC integration on organic matter and nutrient removal in a constructed wetland. The results showed that NH4+-N concentration reduced from 66.5 ±9.4 at day 0 (influent) to 4.5±0.4 mg/L and 7.03±3.93mg/L for the integrated system and control system, respectively. In terms of the NH4+-N removal efficiency, an enhancement of the nitrification rate (Ni) was observed when MFC was integrated in VSSF (120.6±1.5 mg/m² d for control system and 166.8±2.3 mg/m² d for integrated system). The average COD removal efficiencies were 89.36±2.67% and 94.2±5.9% in the CW and CW-MFC, respectively, obtaining a voltage close to 250 mV. The maximum power density generated was 4.75 mW/m². In conclusion, the removal efficiencies of COD and NH4+-N in VSSF were 89.4 and 88.4%, respectively, while in CW-MFC were 94.3 and 93.2 %. Therefore, the integrating of a MFC into CW does not have adverse effects on the capacity of the CW to efficiently domestic wastewater treatment.

Keywords

Microbial fuel cellWastewaterConstructed wetlandOrganic matterNutrientSewage treatment

Identifiers

DOI
10.30955/gnc2019.00488
Journal
Global NEST International Conference on Environmental Science & Technology
Year
2022