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This study integrates microbial fuel cells (MFC) into vertical-flow constructed wetlands (IVCW) to simultaneously treat slightly-polluted source water with high nitrogen and low carbon while generating bioelectricity. The IVCW-MFC system achieved maximum voltage of 777 mV and power density of 8.05 mW/m² at 6000 Ω external resistance, with exceptional total nitrogen removal efficiency averaging 70% (maximum 97.35%) compared to 42% in control wetlands. Macrophytes grew normally without inhibition, demonstrating ecological compatibility.

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What they did

System
MFC

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Abstract

Constructed wetlands have been extensively applied for treating drinking water sources and other water bodies that are not severely polluted due to their low construction and operation costs. In this regard, microbial fuel cells (MFC) could potentially achieve both energy generation and wastewater purification, though the construction cost is high. Based on the bio-electrochemical theory, a novel device of the integrated vertical flow constructed wetland (IVCW) embedded with MFC (IVCW-MFC) was designed and built for treating the slightly-polluted source waters with relatively high nitrogen and low carbon, where denitrification was usually hindered. Both water purification performance and electrical characteristics were examined in this system. It was observed that the maximum output voltage and power density could reach 777 mV and 8.05 mWm -2 , respectively, when the external resistance was 6000 . With a better denitrification effect, the system exhibited a more effective removal of chemical oxygen demand (COD) and nitrate. The maximum efficiency of total nitrogen (TN) removal was as high as 97.35%, while the average removal efficiency was around 70%, even with a load of TN, 3.3 mg/L on average, in the influent. Furthermore, the macrophytes grew normally in the constructed wetland without any influence.

Keywords

Microbial fuel cellEmbeddingConstructed wetlandEnvironmental scienceWetlandFlow (mathematics)ChemistryEnvironmental engineeringPortable water purificationPulp and paper industryWaste managementWastewaterEcologyEngineeringBiologyComputer scienceMechanicsPhysics

Identifiers

DOI
10.15244/pjoes/89982
Journal
Polish Journal of Environmental Studies
Year
2018