- Microbial fuel cell
Mediator-less MFCs are a more recent development; due to this, factors that affect optimum efficiency, such as the strain of bacteria used in the system, type of ion-exchange membrane, and system conditions (temperature, pH, etc.) are not particularly well understood.
- 1 History
- 2 Types
- 3 Electrical generation process
- 4 Applications
- 5 Current research practices
- 6 Commercial applications
- 7 See also
- 8 References
- 9 Further reading
- 10 External links
A professor of botany at the University of Durham, Potter managed to generate electricity from E. coli, but the work was not to receive any major coverage. In 1931, however, Barnet Cohen drew more attention to the area when he created a number of microbial half fuel cells that, when connected in series, were capable of producing over 35 volts, though only with a current of 2 milliamps.
More work on the subject came with a study by DelDuca et al. who used hydrogen produced by the fermentation of glucose by Clostridium butyricum as the reactant at the anode of a hydrogen and air fuel cell. Though the cell functioned, it was found to be unreliable owing to the unstable nature of hydrogen production by the micro-organisms. Although this issue was later resolved in work by Suzuki et al. in 1976 the current design concept of an MFC came into existence a year later with work once again by Suzuki.
By the time of Suzuki’s work in the late 1970s, little was understood about how microbial fuel cells functioned; however, the idea was picked up and studied later in more detail first by MJ Allen and then later by H. Peter Bennetto both from King's College London. Bennetto saw the fuel cell as a possible method for the generation of electricity for developing countries. His work, starting in the early 1980s, helped build an understanding of how fuel cells operate, and until his retirement, he was seen by many[who?] as the foremost authority on the subject.
It is now known that electricity can be produced directly from the degradation of organic matter in a microbial fuel cell, although the exact mechanisms of the process are yet to be fully understood. Like a normal fuel cell, an MFC has both an anode and a cathode chamber. The anoxic anode chamber is connected internally to the cathode chamber via an ion exchange membrane with the circuit completed by an external wire.
In May 2007, the University of Queensland, Australia, completed its prototype MFC, as a cooperative effort with Foster's Brewing. The prototype, (a 10L design), converts brewery wastewater into carbon dioxide, clean water, and electricity. With the prototype proven successful, plans are in effect to produce a 660 gallon version for the brewery, which is estimated to produce 2 kilowatts of power. While it is a negligible amount of power, the production of clean water is of utmost importance to Australia, for which drought is a constant threat.
A microbial fuel cell is a device that converts chemical energy to electrical energy by the catalytic reaction of microorganisms.
A typical microbial fuel cell consists of anode and cathode compartments separated by a cation (positively charged ion) specific membrane. In the anode compartment, fuel is oxidized by microorganisms, generating electrons and protons. Electrons are transferred to the cathode compartment through an external electric circuit, while protons are transferred to the cathode compartment through the membrane. Electrons and protons are consumed in the cathode compartment, combining with oxygen to form water.
More broadly, there are two types of microbial fuel cell: mediator and mediator-less microbial fuel cells.
Mediator microbial fuel cell
Most of the microbial cells are electrochemically inactive. The electron transfer from microbial cells to the electrode is facilitated by mediators such as thionine, methyl viologen, methyl blue, humic acid, neutral red and so on. Most of the mediators available are expensive and toxic.
Mediator-free microbial fuel cell
Mediator-free microbial fuel cells do not require a mediator but uses electrochemically active bacteria to transfer electrons to the electrode (electrons are carried directly from the bacterial respiratory enzyme to the electrode). Among the electrochemically active bacteria are, Shewanella putrefaciens, Aeromonas hydrophila, and others. Some bacteria, which have pili on their external membrane, are able to transfer their electron production via these pili.
Mediator-less microbial fuel cells can, besides running on wastewater, also derive energy directly from certain aquatic plants. These include reed sweetgrass, cordgrass, rice, tomatoes, lupines, and algae. These microbial fuel cells are called Plant Microbial Fuel Cells (Plant-MFC). Given that the power is thus derived from a living plant (in situ-energy production), this variant can provide extra ecological advantages.
Microbial Electrolysis Cell
A variation of the mediator-less MFC is the microbial electrolysis cells (MEC). Whilst MFC's produce electric current by the bacterial decomposition of organic compounds in water, MEC's partially reverse the process to generate hydrogen or methane by applying a voltage to bacteria to supplement the voltage generated by the microbial decomposition of organics sufficiently lead to the electrolysis of water or the production of methane. A complete reversal of the MFC principle is found in microbial electrosynthesis, in which carbon dioxide is reduced by bacteria using an external electric current to form multi-carbon organic compounds.
Soil-based Microbial Fuel Cell
Soil-based microbial fuel cells adhere to the same basic MFC principles as described above, whereby soil acts as the nutrient-rich anodic media, the inoculum, and the proton-exchange membrane (PEM). The anode is placed at a certain depth within the soil, while the cathode rests on top the soil and is exposed to the oxygen in the air above it.
Soils are naturally teeming with a diverse consortium of microbes, including the electrogenic microbes needed for MFCs, and are full of complex sugars and other nutrients that have accumulated over millions of years of plant and animal material decay. Moreover, the aerobic (oxygen consuming) microbes present in the soil act as an oxygen filter, much like the expensive PEM materials used in laboratory MFC systems, which cause the redox potential of the soil to decrease with greater depth. Soil-based MFCs are becoming popular educational tools for science classrooms.
Electrical generation process
When micro-organisms consume a substrate such as sugar in aerobic conditions they produce carbon dioxide and water. However when oxygen is not present they produce carbon dioxide, protons and electrons as described below:
C12H22O11 + 13H2O ---> 12CO2 + 48H+ + 48e- (Eqt. 1)
Microbial fuel cells use inorganic mediators to tap into the electron transport chain of cells and channel electrons produced. The mediator crosses the outer cell lipid membranes and bacterial outer membrane; then, it begins to liberate electrons from the electron transport chain that normally would be taken up by oxygen or other intermediates.
The now-reduced mediator exits the cell laden with electrons that it shuttles to an electrode where it deposits them; this electrode becomes the electro-generic anode (negatively charged electrode). The release of the electrons means that the mediator returns to its original oxidised state ready to repeat the process. It is important to note that this can only happen under anaerobic conditions; if oxygen is present, it will collect all the electrons as it has a greater electronegativity than mediators.
In a microbial fuel cell operation, the anode is the terminal electron acceptor recognized by bacteria in the anodic chamber. Therefore, the microbial activity is strongly dependent on the redox potential of the anode. In fact, it was recently published that a Michaelis-Menten curve was obtained between the anodic potential and the power output of an acetate driven microbial fuel cell. A critical anodic potential seems to exist at which a maximum power output of a microbial fuel cell is achieved.
A number of mediators have been suggested for use in microbial fuel cells. These include natural red, methylene blue, thionine or resorufin.
This is the principle behind generating a flow of electrons from most micro-organisms (the organisms capable of producing an electric current are termed Exoelectrogens. In order to turn this into a usable supply of electricity this process has to be accommodated in a fuel cell. In order to generate a useful current it is necessary to create a complete circuit, and not just shuttle electrons to a single point.
The mediator and micro-organism, in this case yeast, are mixed together in a solution to which is added a suitable substrate such as glucose. This mixture is placed in a sealed chamber to stop oxygen entering, thus forcing the micro-organism to use anaerobic respiration. An electrode is placed in the solution that will act as the anode as described previously.
In the second chamber of the MFC is another solution and electrode. This electrode, called the cathode is positively charged and is the equivalent of the oxygen sink at the end of the electron transport chain, only now it is external to the biological cell. The solution is an oxidizing agent that picks up the electrons at the cathode. As with the electron chain in the yeast cell, this could be a number of molecules such as oxygen. However, this is not particularly practical as it would require large volumes of circulating gas. A more convenient option is to use a solution of a solid oxidizing agent.
Connecting the two electrodes is a wire (or other electrically conductive path which may include some electrically powered device such as a light bulb) and completing the circuit and connecting the two chambers is a salt bridge or ion-exchange membrane. This last feature allows the protons produced, as described in Eqt. 1 to pass from the anode chamber to the cathode chamber.
The reduced mediator carries electrons from the cell to the electrode. Here the mediator is oxidized as it deposits the electrons. These then flow across the wire to the second electrode, which acts as an electron sink. From here they pass to an oxidising material.
Microbial fuel cells have a number of potential uses. The most readily apparent is harvesting electricity produced for use as a power source. Virtually any organic material could be used to feed the fuel cell, including coupling cells to wastewater treatment plants.
Bacteria would consume waste material from the water and produce supplementary power for the plant. The gains to be made from doing this are that MFCs are a very clean and efficient method of energy production. Chemical processing wastewater and designed synthetic wastewater have been used to produce bioelectricity in dual and single chambered mediatorless MFCs (non-coated graphite electrodes) apart from wastewater treatment.
Higher power production was observed with biofilm covered anode (graphite). A fuel cell’s emissions are well below regulations. MFCs also use energy much more efficiently than standard combustion engines which are limited by the Carnot Cycle. In theory an MFC is capable of energy efficiency far beyond 50% (Yue & Lowther, 1986). According to new research conducted by René Rozendal, using the new microbial fuel cells, conversion of the energy to hydrogen is 8x as high as conventional hydrogen production technologies.
However MFCs do not have to be used on a large scale, as the electrodes in some cases need only be 7 μm thick by 2 cm long. The advantages to using an MFC in this situation as opposed to a normal battery is that it uses a renewable form of energy and would not need to be recharged like a standard battery would. In addition to this they could operate well in mild conditions, 20°C to 40°C and also at pH of around 7. Although more powerful than metal catalysts, they are currently too unstable for long term medical applications such as in pacemakers (Biotech/Life Sciences Portal).
Besides wastewater power plants, as mentioned before, energy can also be derived directly from crops. This allows the set-up of power stations based on algae platforms or other plants incorporating a large field of aquatic plants. According to Bert Hamelers, the fields are best set-up in synergy with existing renewable plants (e.g. offshore windturbines). This reduces costs as the microbial fuel cell plant can then make use of the same electricity lines as the wind turbines.
Soil-based microbial fuel cells are popular educational tools, as they employ a range of scientific disciplines (microbiology, geochemistry, electrical engineering, etc.), and can be made using commonly available materials, such as soils and items from the refrigerator. There are also kits available for classrooms and hobbyists, and research-grade kits for scientific laboratories and corporations.
Since the current generated from a microbial fuel cell is directly proportional to the energy content of wastewater used as the fuel, an MFC can be used to measure the solute concentration of wastewater (i.e. as a biosensor system).
The strength of wastewater is commonly evaluated as biochemical oxygen demand (BOD) values.[clarification needed] BOD values are determined incubating samples for 5 days with proper source of microbes, usually activate sludge collected from sewage works. When BOD values are used as a real time control parameter, 5 days' incubation is too long.
An MFC-type BOD sensor can be used to measure real time BOD values. Oxygen and nitrate are preferred electron acceptors over the electrode reducing current generation from an MFC. MFC-type BOD sensors underestimate BOD values in the presence of these electron acceptors. This can be avoided by inhibiting aerobic and nitrate respirations in the MFC using terminal oxidase inhibitors such as cyanide and azide. This type of BOD sensor is commercially available.
Current research practices
Some researchers point out some undesirable practices, such as recording the maximum current obtained by the cell when connecting it to a resistance as an indication of its performance, instead of the steady-state current that is often a degree of magnitude lower. Sometimes[weasel words], data about the value of the used resistance is scanty, leading to non-comparable data between publications.
A number of companies have emerged to commercialize Microbial Fuel Cells. These companies have attempted to tap into both the remediation and electricity generating aspects of the technologies. Some of these are companies are mentioned here.
- Fermentative hydrogen production
- Dark fermentation
- Glossary of fuel cell terms
- Hydrogen technologies
- Hydrogen hypothesis
- ^ Min, B., Cheng, S. and Logan B. E. (2005). Electricity generation using membrane and salt bridge microbial fuel cells, Water Research, 39 (9), pp1675–86
- ^ Potter, M. C. (1911). Electrical effects accompanying the decomposition of organic compounds. Royal Society (Formerly Proceedings of the Royal Society) B, 84, p260-276
- ^ Cohen, B. (1931). The Bacterial Culture as an Electrical Half-Cell, Journal of Bacteriology, 21, pp18–19
- ^ DelDuca, M. G., Friscoe, J. M. and Zurilla, R. W. (1963). Developments in Industrial Microbiology. American Institute of Biological Sciences, 4, pp81–84.
- ^ Karube, I., T. Matasunga, S. Suzuki & S. Tsuru. (1976). Continuous hydrogen production by immobilized whole cells of Clostridium butyricum Biocheimica et Biophysica Acta 24:2 338–343
- ^ Karube, Isao; Matsunaga, Tadashi; Tsuru, Shinya; Suzuki, Shuichi (November 1977). "Biochemical cells utilizing immobilized cells of Clostridium butyricum". Biotechnology and Bioengineering 19 (11): 1727–1733. doi:10.1002/bit.260191112.
- ^ Allen, R.M.; Bennetto, H.P. (1993). "Microbial fuel cells: Electricity production from carbohydrates". Applied Biochemistry and Biotechnology 39-40: 27–40.
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- ^ Lithgow, A.M., Romero, L., Sanchez, I.C., Souto, F.A.,and Vega, C.A. (1986). Interception of electron-transport chain in bacteria with hydrophilic redox mediators. J. Chem. Research, (S):178–179.
- ^ Kim, B.H., Kim, H.J., Hyun, M.S., Park, D.H. 1999a. Direct electrode reaction of Fe (III) reducing bacterium, Shewanella putrefacience. J Microbiol. Biotechnol. 9:127–131.
- ^ Pham, C. A.; Jung, S. J.; Phung, N. T.; Lee, J.; Chang, I. S.; Kim, B. H.; Yi, H.; Chun, J. (2003). "A novel electrochemically active and Fe(III)-reducing bacterium phylogenetically related toAeromonas hydrophila, isolated from a microbial fuel cell". FEMS Microbiology Letters 223 (1): 129–134. doi:10.1016/S0378-1097(03)00354-9. PMID 12799011.
- ^ Mediator-less microbial fuel cell schematic + explanation
- ^ Plant MFC term
- ^ Microbial Electrolysis Cell
- ^ Bruce Logan developing MEC's
- ^ Nevin Kelly P. ; Woodard Trevor L. ; Franks Ashley E. ; et al. (May-June 2010). "Microbial Electrosynthesis: Feeding Microbes Electricity To Convert Carbon Dioxide and Water to Multicarbon Extracellular Organic Compounds". mBio 1 (2). doi:10.1128/mBio.00103-10. http://mbio.asm.org/content/1/2/e00103-10.full.
- ^ Soil-based MFCs
- ^ Bennetto, H. P. (1990). Electricity Generation by Micro-organisms Biotechnology Education, 1 (4), pp. 163–168
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- ^ Venkata Mohan, S.; Mohanakrishna, G.; Srikanth, S.; Sarma, P. N. (2008). "Harnessing of bioelectricity in microbial fuel cell (MFC) employing aerated cathode through anaerobic treatment of chemical wastewater using selectively enriched hydrogen producing mixed consortia". Fuel 87 (12): 2667-2676. doi:10.1016/j.fuel.2008.03.002. http://www.microbialfuelcell.org/Publications/BEEC/R2.pdf.
- ^ Venkata Mohan, S.; Mohanakrishna, G.; Reddy, B. P.; Saravanan, R.; Sarma, P. N. (2008). "Bioelectricity generation from chemical wastewater treatment in mediatorless (anode) microbial fuel cell (MFC) using selectively enriched hydrogen producing mixed culture under acidophilic microenvironment". Biochemical Engineering Journal 39: 121-130. doi:10.1016/j.bej.2007.08.023. http://www.microbialfuelcell.org/Publications/BEEC/Reprint%20II.pdf.
- ^ Venkata Mohan, S., Veer Raghuvulu, S., Srikanth, S., Sarma, P.N., 2007. Bioelectricity production by meditorless microbial fuel cell (MFC) under acidophilic condition using wastewater as substrate: influence of substrate loading rate. “Current Sci.” 92(12), 1720-1726.
- ^ Venkata Mohan, S.; Saravanan, R.; Raghavulu, S. V.; Mohanakrishna, G.; Sarma, P. N. (2008). "Bioelectricity production from wastewater treatment in dual chambered microbial fuel cell (MFC) using selectively enriched mixed microflora: Effect of catholyte". Bioresource Technology 99 (3): 596–603. doi:10.1016/j.biortech.2006.12.026. PMID 17321135. http://www.microbialfuelcell.org/Publications/BEEC/Reprint%203.pdf.
- ^ Venkata Mohan, S.; Veer Raghavulu, S.; Sarma, P. N. (2008). "Biochemical evaluation of bioelectricity production process from anaerobic wastewater treatment in a single chambered microbial fuel cell (MFC) employing glass wool membrane". Biosensors and Bioelectronics 23 (9): 1326–1332. doi:10.1016/j.bios.2007.11.016. PMID 18248978. http://microbialfuelcell.org/Publications/BEEC/Reprint%20I.pdf.
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- ^ Eos magazine, Waterstof uit het riool, June 2008
- ^ Keego Technologies - MudWatt MFC
- ^ Research-Grade BES Test Kits
- ^ Kim, BH.; Chang, IS.; Gil, GC.; Park, HS.; Kim, HJ. (April 2003). "Novel BOD (biological oxygen demand) sensor using mediator-less microbial fuel cell.". Biotechnology Letters 25 (7): 541-545. doi:10.1023/A:1022891231369. PMID 12882142.
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- ^ Menicucci, Joseph Anthony Jr., Haluk Beyenal, Enrico Marsili, Raaja Raajan Angathevar Veluchamy, Goksel Demir, and Zbigniew Lewandowski, Sustainable Power Measurement for a Microbial Fuel Cell, AIChE Annual Meeting 2005, Cincinnati, USA
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- Liu H, Cheng S and Logan BE (2005). "Production of electricity from acetate or butyrate using a single-chamber microbial fuel cell". Environ Sci Technol 32 (2): 658–62. doi:10.1021/es048927c.
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- Yue P.L. and Lowther K. (1986). Enzymatic Oxidation of C1 compounds in a Biochemical Fuel Cell. The Chemical Engineering Journal, 33B, p 69-77
- Rabaey, K. et al. (May, 2007). "Microbial ecology meets electrochemistry: electricity-driven and driving communities". Isme J. 1 (1): 9–18. doi:10.1038/ismej.2007.4. PMID 18043609.
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- Sustainable and efficient biohydrogen production via electrohydrogenesis -Nov 2007
- Microbial Fuel Cell blog A research-type blog on common techniques used in MFC research.
- Microbial Fuel Cells This website is originating from a few of the research groups currently active in the MFC research domain.
- Microbial Fuel Cells from Rhodopherax Ferrireducens An overview from the Science Creative Quarterly.
- Building a Two-Chamber Microbial Fuel Cell
- Discussion group on Microbial Fuel Cells
- Innovation company developing MFC technology
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