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Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
In-situ utilizing the produced electricity to regulate substrate conversion in denitrifying sulfide removal microbial
Yubo Liu1, Ke Wang1, Shaohui Zhang2
1School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China.
Abstract:
A denitrifying sulfide removal microbial fuel cell, incorporated with a capacitor and run in an alternate charging and discharging mode, was developed to in-situ utilize the produced electricity. The switching interval, external resistance distribution and temperature were used to adjust substrates conversion via regulating electrode potentials. The switching interval of 10 min favored the formation of sulfur and gaseous nitrogen. Adjusting the external resistances via the constant anode potential method was a feasible measure for regulating the cathode potential and promoting nitrate reduction, achieving a total nitrogen removal rate of 16.5 ± 0.8 g N/(m3 d) and a gaseous nitrogen formation percent of 32.2 ± 1.5%. 30 °C favored gaseous nitrogen formation while 10 °C and 40 °C benefited sulfur formation. In-situ utilization of the produced electricity shifted the microbial community structure. This work provided a novel approach to regulate the substrate conversion by in-situ utilizing the produced electricity.
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