scholarly journals Simultaneous removal of heavy metals and bioelectricity generation in microbial fuel cell coupled with constructed wetland: an optimization study on substrate and plant types

2021 ◽  
Author(s):  
Lu Wang ◽  
Dayong Xu ◽  
Qingyun Zhang ◽  
Tingting Liu ◽  
Zhengkai Tao
Keyword(s):  
Heavy Metals ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Constructed Wetland ◽  
Simultaneous Removal ◽  
Bioelectricity Generation ◽  
Optimization Study ◽  
Removal Of Heavy Metals

scholarly journals Simultaneous Removal of Heavy Metals And Bioelectricity Generation In Microbial Fuel Cell Coupled With Constructed Wetland: An Optimization Study On Substrate And Plant Types

2021 ◽  
Author(s):  
Lu Wang ◽  
Dayong Xu ◽  
Qingyun Zhang ◽  
Tingting Liu ◽  
Zhengkai Tao
Keyword(s):  
Heavy Metals ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Constructed Wetland ◽  
Water Hyacinth ◽  
Plant Roots ◽  
Optimization Study ◽  
Removal Of Heavy Metals ◽  
Metal Treatment ◽  
Optimal Construction

Abstract A microbial fuel cell coupled with constructed wetland (CW-MFC) was built to remove heavy metals (Zn and Ni) from sludge. The performance for the effects of substrates (granular activated carbon (GAC), ceramsite) and plants (Iris pseudacorus, Water hyacinth) towards the heavy metal treatment as well as electricity generation were systematically investigated. The CW-MFC systems possessed higher Zn and Ni removal efficiencies as compared to CW. The maximal removal rates of Zn (76.88%) and Ni (66.02%) were obtained in system CW-MFC based on GAC and Water hyacinth (GAC- and WH-CW-MFC). Correspondingly, the system produced the maximum voltage of 534.30 mV and power density of 70.86 mW·m-3, respectively. Plant roots and electrodes contributed supremely to the removal of heavy metals, especially for GAC- and WH-CW-MFC systems. The coincident enrichment rates of Zn and Ni reached 21.10% and 26.04% for plant roots, 14.48% and 16.50% for electrodes, respectively. A majority of the heavy metals on the sludge surface were confirmed as Zn and Ni. Furthermore, the high-valence Zn and Ni were effectively reduced to low-valence or elemental metals. This study provides a theoretical guidance for the optimal construction of CW-MFC and the resource utilization of sludge containing heavy metals.

scholarly journals Bioelectricity generation from air-cathode microbial fuel cell connected to constructed wetland

2018 ◽  
Vol 78 (9) ◽  
pp. 1990-1996 ◽  
Author(s):  
Dengming Yan ◽  
Xinshan Song ◽  
Baisha Weng ◽  
Zhilei Yu ◽  
Wuxia Bi ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Constructed Wetland ◽  
Oxygen Demand ◽  
Pollutant Removal ◽  
Fed Batch ◽  
Air Cathode ◽  
Batch Mode ◽  
Bioelectricity Generation ◽  
N Removal

Abstract The aim of this study was to investigate the different performance of bioelectricity generation and wastewater treatment between constructed wetland (CW) respectively coupled with air-cathode microbial fuel cell (ACMFC) and microbial fuel cell (MFC) under a fed-batch mode. During a 75-day-operation, the voltage of CW-ACMFC and CW-MFC ranged from 0.36 to 0.52 V and from −0.04 to 0.07 V, indicating that the bioenergy output of CW-ACMFC was significantly higher than that of CW-MFC system. In addition, the maximum of power density of CW-ACMFC and CW-MFC was 4.21 and 0.005 mW m−2. Notably, the chemical oxygen demand (COD) and NH3-N removal efficiency of CW-ACMFC was slightly higher than that in CW-MFC, which resulted from a higher voltage accelerating the transport of electron donors and the growth of microorganisms and plants. This study possesses a probability of using ACMFC coupled with CW to enhance the pollutant removal performance in CW system.

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