First study to explore the feasibility of applying microbial fuel cells into constructed wetlands for COD monitoring. (November 2017)

• Record Type: Journal Article
• Authors: Xu, Lei; Zhao, Yaqian; Fan, Chuang; Fan, Zhiren; Zhao, Fangchao
• Is Part Of: Bioresource technology. Volume 243(2017)
• Page Start: 846
• Page End: 854
• Publication Date: 2017-11
• Subjects: Constructed wetland -- Microbial fuel cell -- Chemical oxygen demand -- Monitoring -- Sensor; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.06.179
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: MFC was firstly explored to evaluate COD concentration in CWs system. Different carbon sources with same COD concentration can result in different electrical signal production. Alum sludge substrate may contribute to alleviate pH stratification in CW-MFC system. Conductivity has significant influence on electrical signal production in CW-MFC system. Abstract: Chemical oxygen demand (COD) is one of the major targets to remove in constructed wetlands (CWs) system. Traditional method for COD measurement is a complex, time-consuming and highly toxic reagents participated procedure. In this study, microbial fuel cell (MFC) was successfully integrated into CW for indicating COD concentration. Results showed that there are two linear correlations between bioelectrical signals (output voltage from MFC) and COD concentration (acetate), which are COD from 0 to 500 mg/L (101.99 ± 7.42 to 631.74 ± 7.41 mV, R 2 = 0.9710) and then from 500 to 1000 mg/L (631.74 ± 7.41 to 668.46 ± 0.01 mV, R 2 = 0.9245). Furthermore, results also revealed the specificity of the system in terms of different types of carbon source. Overall, this work presented the feasibility of using CW-MFC for in-situ sensing COD during the wastewater treatment process, which will be a promising technique for water quality monitoring within CWs.