Two-stage hybrid constructed wetland-microbial fuel cells for swine wastewater treatment and bioenergy generation

• Published in: Chemosphere (Oxford) Vol. 268; p. 128803
• Main Authors: Ren, Baiming, Wang, Tongyue, Zhao, Yaqian
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.04.2021
• Subjects: Alum sludge; Animals; Bioelectric Energy Sources; Constructed wetlands; Electricity; Electricity generation; Electrodes; Family Characteristics; Microbial fuel cell; Swine; Waste Water; Wastewater treatment; Water Purification; Waterworks residues; Wetlands; Microbial fuel cell; Alum sludge; Waterworks residues; Wastewater treatment; Electricity generation; Constructed wetlands
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2020.128803

A newly emerged alum sludge-based hybrid constructed wetland-microbial fuel cells (CW-MFCs), i.e. vertical upflow CW coupled MFC as 1st stage and horizontal subsurface flow CW coupled MFC as 2nd stage (VFCW-MFC + HSSFCW-MFC), was firstly developed for swine wastewater treatment and electricity generation. Swine wastewater and multi-set air-cathodes were applied to investigate the pollutants removal behavior and the power production. Six-month trial suggested that the overall removal efficiency of SS, COD, NH4+-N, NO3−-N, TN, TP and PO43--P was 76 ± 12.4, 72 ± 7.4, 59 ± 28.3, 69 ± 25.6, 47 ± 19.7, 85 ± 9.5 and 88 ± 8.7%, respectively. The two stages hybrid system (VFCW-MFC + HSSFCW-MFC) continuously generated electrical power with average voltages of 0.44 ± 0.09 and 0.34 ± 0.09 V, and power densities of 33.3 ± 13.81 and 9.0 ± 2.5 mW/m³ in 1st and 2nd stage, respectively. The average net energy recovery (NER) of 1st stage and 2nd stage is in turn 0.91 ± 0.16 and 2.76 ± 0.70 Wh/kg·COD. It indicates that the hybrid CW-MFCs has higher removal efficiency than single stage CW-MFC, while 1st stage plays the major role both in pollutants removal and power generation. [Display omitted] •Alum sludge-based two-stage hybrid CW-MFCs was firstly developed.•The overall COD, TN, and TP removals of 72 ± 7.4, 47 ± 19.7, and 85 ± 9.5% were, respectively, obtained.•The average NER of 1st and 2nd stage was 0.91 ± 0.16 and 2.76 ± 0.70 Wh/kg·COD, respectively.•1st stage (VF) plays the major role in both pollutants removal and power generation.•Entire system volume and specific electrode volume are the main factors of electricity generation.