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82% confidence

This study developed thermophilic single-chamber air-cathode microbial fuel cells (thermo-MFCs) equipped with hydrophobic membrane electrodes to remove and recover ammonia and water from chicken manure leachate. Thermo-MFCs achieved 83% ammonia removal in closed-circuit mode, outperforming mesophilic MFCs (48%), while simultaneously recovering water at 36.5 L m⁻² d⁻¹ via vapor condensation. Both systems recovered within 24 h from inhibition by 7200 mg L⁻¹ ammonia, demonstrating resilience and potential for sustainable wastewater treatment and resource recovery.

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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 from thermophilic solid-state anaerobic fermentation leachate and mesophilic anaerobic wastewater

What worked

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Abstract

Abstract In wastewater treatment, biological nitrogen removal is an important topic, and the optimal condition for it is a mesophilic environment. This study developed a thermophilic microbial fuel cells (thermo-MFCs) equipped with a hydrophobic membrane electrode to remove and recover ammonia and water from leachate. The results were compared with those of the mesophilic MFCs (meso-MFCs) and they show that the current and power densities for meso-MFCs are higher. The ammonia removal efficiencies of thermo-MFCs are 83% (closed circuit) and 60% (open circuit), higher than those of closed- and open-circuit meso-MFCs (48 and 38%, respectively). Water vapor, the main recovery water flux for the thermo-MFCs, provided 36.5 L m − 2 d − 1 using the closed-circuit mode without applied energy. Moreover, thermo-MFCs and meso-MFCs can be restored within 24 h even under inhibition by using 7200 mg L − 1 ammonia. The proposed process presents an economic and ecofriendly method to not only recover water and ammonia from leachate but also alleviate ammonia inhibition.

Keywords

Microbial fuel cellLeachateAmmoniaMesophileWastewaterThermophile

Identifiers

DOI
10.1186/s42834-020-0045-0
Journal
Sustainable Environment Research
Year
2020