An Approach to Predicting Sediment Microbial Fuel Cell Performance in Shallow and Deep Water
Abstract
:Featured Application
Abstract
1. Introduction
2. Materials and Methods
3. Results
3.1. Shallow Water Predictions (<100 m)
3.2. Deep Water Predictions (≥1000 m)
4. Discussion
- (1)
- It could be due to lack of Geobacter-like electrogenic bacteria at deeper depths, hinted at by the unexpected temperature response from the deeper sediment tests. While Geobacter is widely distributed in marine sediments, we did not test for its presence in our samples.
- (2)
- It could be due to finer sediment particle size in deeper sediments. Finer particle size results in less permeability and reduced pore water circulation [24]. Since microbial metabolism at the anode is partially limited by the advection and diffusion of organic material in the pore water, reduced permeability would negatively impact MFC power output. Coarse analysis of grain size in the sediment samples revealed that the shallow sediments from 5 m depth had percent fines (percent of clay plus silt by weight) of ~45% while percent fines of sediments from >1000 m depth ranged from 80% to 100% (unpublished data).
- (3)
- It could be due to a relative lack of labile material at depth. Global benthic bacteria biomass has been found to be proportional to TOC sediment concentrations, and sediment concentrations are generally inversely proportional to water depth and distance from land [24]. Small organic particles (e.g., dead plankton) sink slowly and are subject to bacterial attack. The labile fraction of total organic matter reaching the bottom in the Mediterranean Sea decreased with depth [25]. The benthic bacterial population density in Mediterranean sediments was correlated with carbohydrate (labile TOC) concentrations at depths from 100 m to 2400 m.
5. Conclusions
- Shallow sediment MFCs are predicted to yield significantly greater power densities than deep sediment MFCs. We predict shallow sediment MFC power density to range from 5 to 10 mW/m2 off the Texas coast and 4 to 7 mW/m2 off the South Korean coast, using a 1 m2 anode. We predict deep sediment power density < 1 mW/m2 for the same anode size.
- Near-bottom water temperatures off Texas and South Korea warm ~10 °C seasonally from February to August. This temperature increase is predicted to increase MFC power densities by 1 to 2 mW/m2.
- Observations connected with this study suggest that testing MFCs with sediments collected at depth (≥1000 m) and not pressurized during retrieval or in the laboratory does not unduly impact power density estimates.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Richter, K.E.; Ayers, J.M. An Approach to Predicting Sediment Microbial Fuel Cell Performance in Shallow and Deep Water. Appl. Sci. 2018, 8, 2628. https://doi.org/10.3390/app8122628
Richter KE, Ayers JM. An Approach to Predicting Sediment Microbial Fuel Cell Performance in Shallow and Deep Water. Applied Sciences. 2018; 8(12):2628. https://doi.org/10.3390/app8122628
Chicago/Turabian StyleRichter, Kenneth E., and Jennifer M. Ayers. 2018. "An Approach to Predicting Sediment Microbial Fuel Cell Performance in Shallow and Deep Water" Applied Sciences 8, no. 12: 2628. https://doi.org/10.3390/app8122628