5. CONCLUSIONS
The bioelectricity generated by the SMFC can be used to supply the power
to the environmental monitoring sensors. This power source can be a
sustainable and green source of electricity. The performance of the
system with two anodes was about twice higher than that of with one
anode regarding bioelectricity generation. The variation of AVS value
was observed and decreased about 0.2 mg/g-dry mud indicated the
improvement of the geoenvironment for the marine sediments after using
SMFCs in the contaminated sediments both in the laboratory and in the
field . By observing the different circuit conditions, it was found that
the rate of AVS decreasing was the fastest and slowest when a close
circuit and no circuit (blank) condition was set, respectively. It
showed the similar trend as Abbas et al. 2019 have been observed. Higher
temperature is better for enhancement of voltage generation because the
bacterial activities enhanced with the enhancement of the temperature.
It was observed that voltage at 250 C was almost 8
times higher than that of at 50 C. From the laboratory
test and the field test result comparison, it was found that voltage
generation is more durable in the tidal flat areas however, during the
winter, the voltage generation might be deceased due to colder
surrounding temperature in Japan. So, proposed SMFC system can both
generate bioelectricity and improve the geoenvironmental condition of
the marine sediment at the same time and extra measure should be taken
at the winter season for sustainable power supply from SMFC. Economic
analysis and the feasibility of the large scale SMFCs in the field
should be carried out in the future.
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