Constructed Wetlands Coupled Microbial Fuel Cell Offers Promise for Water Treatment and Carbon Emissions Reduction

Researchers from Qingdao University in China have conducted a comprehensive review of constructed wetlands coupled microbial fuel cells (CW-MFCs) as a solution for wastewater treatment and greenhouse gas emissions. The study, published in the Journal of Water Process Engineering, highlights the eco-friendly nature of CW-MFCs, which can generate bioelectricity while reducing pollution and carbon emissions. Financial support for the research came from the National Natural Science Foundation of China, Natural Science Foundation of Shandong Province, and Qingdao Natural Science Foundation.

Key Takeaways:

• CW-MFCs efficiently remove conventional or refractory pollutants and reduce greenhouse gas emissions via extracellular electron transfer by electroactive bacteria.
• Citespace, VOSviewer, and Random Forest model bibliometrics of factors about GHG in CW-MFC were conducted, revealing the greatest relative importance of C/N ratio for methane (31.10%) and nitrous oxide (32.61%).
• Operation strategies for CW-MFCs were summarized, including operational/process parameters, microbial domestication, and technology combination.
• Practical recommendations for the large-scale implementation of CW-MFCs were proposed, focusing on cost-benefit analysis, electricity generation efficiency, plant vitality, expiration date, and microorganism enhancement.
• The study identified areas for improvement, including cost-benefit analysis and electricity generation efficiency.
• The researchers emphasized the importance of microorganism enhancement for the effective operation of CW-MFCs.
• The study highlighted the potential of CW-MFCs for industrialization and widespread adoption.

Statistics:

• 31.10%: greatest relative importance of C/N ratio for methane reduction
• 32.61%: greatest relative importance of C/N ratio for nitrous oxide reduction
• 78: Issue number of the Journal of Water Process Engineering publication
• 344: Authors of the study, including Sen Wang and Huazhen Wu
• 5: Year of publication of the Journal of Water Process Engineering publication

Sources:

• Synergistic Pollution and Carbon Emission Reductions Via Constructed Wetland Coupled Microbial Fuel Cell: a Critical Review. Journal of Water Process Engineering, 2025;78.
• National Natural Science Foundation of China
• Natural Science Foundation of Shandong Province
• Qingdao Natural Science Foundation
• Journal of Water Process Engineering, Elsevier, Radarweg 29, 1043 Nx Amsterdam, Netherlands
• Qingdao University, Sch Environm & Geog, Qingdao 266071, People's Republic of China.