Quantitative determination of linear alkylbenzene sulfonate (LAS) concentration and simultaneous power generation in a microbial fuel cell-based biosensor. (20th April 2021)

• Record Type: Journal Article
• Authors: Askari, Anis; Vahabzadeh, Farzaneh; Mardanpour, Mohammad Mahdi
• Is Part Of: Journal of cleaner production. Volume 294(2021)
• Publication Date: 2021-04-20
• Subjects: Microbial fuel cell -- Biosensor -- Linear alkylbenzene sulfonate (LAS) -- Modeling; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2021.126349
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Linear alkylbenzene sulfonate (LAS), one of the most widely used synthetic surfactants in laundry detergent industry, is considered a hazardous contaminant in wastewater. In the present study, a microbial fuel cell (MFC) based biosensor is developed to quantitively determine the LAS concentration in wastewater. To do so, the developed MFC is fed with LAS concentration of 60 mg l −1 . Finally, a sustained biofilm is formed after almost 34 days and the highest open circuit potential of 425 mV is recorded. The maximum power and current densities of 75 mW m −3 and 663 mA m −3 are obtained, respectively; and the internal resistance of the MFC-based biosensor is calculated to be about 1 kΩ. After 98 h, LAS removal and coulombic efficiency are 90% and 65%, respectively. A linear correlation between the current density and LAS concentration (in the range of 10–120 mg l −1 ) is obtained. Furthermore, a comprehensive model is used to interpret the output electrical signal of the MFC representing temporal and spatial distributions of different microorganisms as well as the hierarchal processes of the LAS biodegradation. The competition between electrogens and methanogens in the biofilm; and also, the effect of external resistance on electrogen concentration are shown as well. Besides, the MFC-based biosensor desirably performed as a power generator and purifier in addition to being an accurate biosensor. Graphical abstract: Image 1 Highlights: A microbial fuel cell is used to monitor LAS concentration during biodegradation. LAS removal and coulombic efficiency are 90% and 65%, respectively. A comprehensive model is used to interpret the output electrical signal of the MFC. The maximum power density of about 75 mW m −3 was obtained for the MFC-based biosensor.