Effects of heavy metals (Fe3+/Cr6+) on low-level energy generation in a microbial fuel cell

29th Symposium of Malaysian Chemical Engineers 2016

Caparanga, A.R.^1 ; Balatbat, A.S.^1 ; Tayo, L.^1

School of Chemical Engineering and Chemistry, Mapua Institute of Technology, Manila

1002, Philippines^1

关键词: Electron acceptor;    Energy generations;    Glucose concentration;    Potential technologies;    Pseudomonas aeruginosa;    Substrate concentrations;    Substrate conversion;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/206/1/012031/pdf
DOI  :  10.1088/1757-899X/206/1/012031

来源: IOP

【 摘 要 】

A dual-chamber microbial fuel cell (MFC) was constructed with Pseudomonas aeruginosa as biocatalyst to facilitate substrate conversion and, consequently, low-level energy generation. To simulate a wastewater situation with BOD and heavy metals contamination, glucose and Fe3+and Cr6+were used as substrate and heavy-metal spikes, respectively. The effects of varying substrate concentrations (150 ppm, 300 ppm, 600 ppm) and heavy metal loads (10 ppm, 50 ppm, 100 ppm) on overall power generation were evaluated. The presence of Cr6+in the anode compartment decreased the potential from 565 to 201 mV (i.e., lowest value achieved at highest Cr6+concentration of 300 ppm). On the other hand, replacing Cr6+with Fe3+as electron acceptor resulted in substantial increase in measured potential (i.e., from 565 to 703 mV). Increasing glucose concentrations resulted in longer time to reach constant open circuit voltage. A maximum potential of 606 mV was achieved at 1200 ppm glucose. Incorporating Pseudomonas aeruginosa increased the potential from 256 to 592 mV. On the basis of these results, a microbial fuel cell feeding on wastewater can be an important potential technology for generating low-level energy.