Growcom trials commercial biogas production from banana waste - high potential yields
The thought of powering communities and vehicles on banana waste may sound a little unrealistic, but University of Queensland researcher and Associate Professor Bill Clarke, shows it is a perfectly feasible option. Between 2004 and 2005 Dr Clarke, supported by the Queensland Government through the Qld Sustainable Energy Innovation Fund (QSEIF), Ergon Energy, and The Australian Banana Growers' Association Inc., uncovered the potential to produce biogas from banana waste.
Over 310,000 tonnes of banana are grown in Australia each year, of which 250,000 tonnes are grown in Northern Queensland. Due to high consumer expectations on the quality of the fruit, approximately 30% of the bananas are rejected at the packing shed. On a global scale, around 70 million tonnes of bananas are produced each year of which 20% enter world trade.
Dr Clarke demonstrated that there are no technical barriers to digesting banana waste at a commercial scale in Australia. The process requires simple infrastructure, the feedstock is easy to handle and produces a high yield of methane per unit weight of dry banana. Based on stabilised operation in fed-batch digestion trials, the banana waste produced maximum yields of over 398 liters of CH4 per kilogram of dry banana (table showing results for one reactor, click to enlarge). With this yield, 1 ton per day can generate around 7.5 kW of electricity, enough to supply six to eight modern households.
With this large biomass resource and high yields in mind, peak horticulture organisation Growcom decided to transform Dr Clarke's lab research into a commercial scale project in North Queensland, a location where bananas are far from scarce. The venture is supported by an additional QSEIF grant.
Growcom completed the major infrastructure required for this 'Banana Waste to Energy' and is now ready to put the plant online. Infrastructure which has been built on the banana plantation of Bush Holdings at Tully conveys the waste banana material to a purpose-built anaerobic digester where gas will be produced. Loading of the digester has now commenced, utilising the pre-existing chopper unit on the host farm. Mulched banana waste enters the digester automatically via a modified chopper.
energy :: sustainability :: biomass :: bioenergy :: biofuels :: biogas :: biomethane :: anaerobic digestion :: natural gas :: CNG :: banana :: Queensland ::
While extracting methane from bananas is technically possible, it does require careful monitoring to maximize yields. The digestion of the waste bananas has to be controlled for pH and temperature.
This feedstock dedicated research into biogas production could be beneficial to many tropical developing countries where bananas and plantains are produced in large quantities, either for domestic consumption or for exports. With increasing fossil fuel prices, the technology could offer an option for waste-management that yields affordable green energy.
Dr Clarke is now working on biohydrogen production from the anaerobic digestion of organic waste using a novel membrane.
References:
Jensen, P., Hardin, M. T., Clarke, W. P., "Preliminary evaluation of banana waste as a substrate for energy generation", CHEMECA 2005 - 33rd Australasian Chemical Engineering Conference, Vol. 1, pp. 1 - 7, 2005, Institute of Engineers
Clarke, W. P., Radnidge, P., Lai, E.T., Jensen, P., Hardin, M. T., "Digestion of waste bananas to generate energy in Australia", [*.pdf] Sardina 2005, Tenth International Waste Management and Landfill Symposium, pp. 497 - 498, CISA, Environmental Sanitary Engineering Centre
University of Queensland: The power of bananas revealed - January 14, 2008.
Growcom: Pilot biofuel plant ready to get under way - December 4, 2007.
Over 310,000 tonnes of banana are grown in Australia each year, of which 250,000 tonnes are grown in Northern Queensland. Due to high consumer expectations on the quality of the fruit, approximately 30% of the bananas are rejected at the packing shed. On a global scale, around 70 million tonnes of bananas are produced each year of which 20% enter world trade.
Dr Clarke demonstrated that there are no technical barriers to digesting banana waste at a commercial scale in Australia. The process requires simple infrastructure, the feedstock is easy to handle and produces a high yield of methane per unit weight of dry banana. Based on stabilised operation in fed-batch digestion trials, the banana waste produced maximum yields of over 398 liters of CH4 per kilogram of dry banana (table showing results for one reactor, click to enlarge). With this yield, 1 ton per day can generate around 7.5 kW of electricity, enough to supply six to eight modern households.
With this large biomass resource and high yields in mind, peak horticulture organisation Growcom decided to transform Dr Clarke's lab research into a commercial scale project in North Queensland, a location where bananas are far from scarce. The venture is supported by an additional QSEIF grant.
Growcom completed the major infrastructure required for this 'Banana Waste to Energy' and is now ready to put the plant online. Infrastructure which has been built on the banana plantation of Bush Holdings at Tully conveys the waste banana material to a purpose-built anaerobic digester where gas will be produced. Loading of the digester has now commenced, utilising the pre-existing chopper unit on the host farm. Mulched banana waste enters the digester automatically via a modified chopper.
An over-riding principle of the project has been to use locally available materials and expertise wherever possible. The system must also integrate with existing farm practices. If on-farm digesters are to have a commercial future they must add to farm efficiency and be simple to operate. - Project Manager and Growcom Board Member Keith NobleOnce methane production commences (nominally two weeks from loading), gas output and quality data will be monitored to assess actual energy production. This will establish the degree of gas cleanup required and gas compression timing. The compressed methane will be stored in 100 litre cylinders. A diesel ute is being converted to run on the banana gas, as will an on-site generator for electricity production. The figures derived from these practical applications will determine the project’s overall viability and potential for replication on other farms:
energy :: sustainability :: biomass :: bioenergy :: biofuels :: biogas :: biomethane :: anaerobic digestion :: natural gas :: CNG :: banana :: Queensland ::
While extracting methane from bananas is technically possible, it does require careful monitoring to maximize yields. The digestion of the waste bananas has to be controlled for pH and temperature.
We demonstrated in 2004-2005 that waste bananas and stalk material within the banana bunch are a great source of methane. There are no technical problems with producing methane from bananas. However, for the process to be economically viable, we need to develop a cheaper and simpler digester compared to those that are currently used for organic waste in Europe. - Dr Bill ClarkeThe Banana Growers' Association will switch a genset from diesel to biogas, but in principle the gaseous fuel - stored at moderate pressure -, can be used directly as a transportation fuel in CNG-capable vehicles, as is done in Europe.
This feedstock dedicated research into biogas production could be beneficial to many tropical developing countries where bananas and plantains are produced in large quantities, either for domestic consumption or for exports. With increasing fossil fuel prices, the technology could offer an option for waste-management that yields affordable green energy.
Dr Clarke is now working on biohydrogen production from the anaerobic digestion of organic waste using a novel membrane.
References:
Jensen, P., Hardin, M. T., Clarke, W. P., "Preliminary evaluation of banana waste as a substrate for energy generation", CHEMECA 2005 - 33rd Australasian Chemical Engineering Conference, Vol. 1, pp. 1 - 7, 2005, Institute of Engineers
Clarke, W. P., Radnidge, P., Lai, E.T., Jensen, P., Hardin, M. T., "Digestion of waste bananas to generate energy in Australia", [*.pdf] Sardina 2005, Tenth International Waste Management and Landfill Symposium, pp. 497 - 498, CISA, Environmental Sanitary Engineering Centre
University of Queensland: The power of bananas revealed - January 14, 2008.
Growcom: Pilot biofuel plant ready to get under way - December 4, 2007.
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