In an age of petroleum dependency and rampant deforestation, bamboo is something of a miracle crop. We use it as an alternative to single-use plastics and pesticide-rich cotton. It even makes a superior building material for everything from furniture to houses. But did you know you can also use bamboo for fuel?
In 2015, the first bamboo-fueled power plant opened in Japan. And five years later it’s still gaining steam. The joint venture between the New Energy and Industrial Technology Development Organization (NEDO) and local industry has found a way to generate cleaner energy with a readily renewable and available resource.
The Kumamoto Prefecture, in southwestern Japan, has traditionally been a great bamboo producing area, so it’s the perfect place to set up a biomass power plant using bamboo for fuel. The power plant is located in the town of Nankan, in Kumamoto.
Why burn bamboo for fuel?
The principle of burning bamboo for fuel is similar to any other biomass fuel production. Instead of burning fossil fuels that require millions of years of geological pressure, biomass grows annually under the rain and sun. Corn, hemp and wood logs are some common examples of biomass.
Bamboo makes an ideal resource for biomass because of how fast it grows. As a grass, it renews itself almost immediately, with no need to plow the fields and sow the seeds. When bamboo is cut down and harvested, the complex root systems remain alive and intact, ready to send up new shoots.
Furthermore, it produces about 30-35% more oxygen than an equal area of trees. In this way, bamboo battles climate change by reducing carbon in the atmosphere, both coming and going.
The Kumamoto Prefecture is the second greatest bamboo producing region in Japan, after the Kagoshima Prefecture. But the demand for bamboo has actually been on the decline in Japan, at least the variety of bamboo that grows there.
Demand for Moso Bamboo in China has been steadily growing as the bamboo flooring and textile industries expand, but not so much in Japan. So bamboo growers were eager to put their fast-growing and versatile crop to good use. And by doing so they gave the local economy a good kick and protected the environment at the same time.
How do you burn bamboo for fuel?
Like a conventional power plant, the idea is to create heat which can be used to turn turbines. Usually the heat boils water and creates steam which will turn the blades of a turbine. As the turbines spin, energy is generated. The bamboo fueled power plant in Japan operates in this manner. They also burn bamboo to heat oil which evaporates and turns the turbines in the same way.
Initially, however, the power plant operators and engineers in Nankan were running into difficulties. When they began experimenting with bamboo for combustion, they found that it burned at too high a temperature. This caused the ash to harden and melt and muck up the equipment. The solution was to add other material, like cedar wood, which lowered the temperature of combustion and stopped the ash from melting.
So the plant did not become fully operational until August 2019. And now they are working to make it more efficient as a source of both heat and electricity for the local community. By 2023, the power plant expects to be incinerating about 8,800 metric tons of bamboo a year.
Bamboo in the gas tank
In addition to fueling a power plant, researchers are also studying the using of bamboo biomass fuel for running cars. Corn has been the primary source for this cellulosic ethanol, but relying on food crops for fuel has drawbacks. Most people agree that corn, cassava and other food cops can be put to better use by feeding people.
The study of non-food biomass for fuel has expanded in recent years. Trees and bamboo, for example, require far less fertilizer and attention to grow. But breaking these plants down into cellulose can be difficult, involving a long and costly fermentation process. Currently the cost of nitrogen-hungry enzymes that break non-food crops like bamboo into sugar and cellulose seems to outweigh the benefits.
The latest methodology for converting bamboo into ethanol fuel uses a bacteria called Zymomonas mobilis. As an alternative to yeast-based fermentation, this microbe can capture nitrogen from the atmosphere and produce ethanol more quickly than other methods. But chemists and microbiologists agree that more research is needed before bamboo-powered cars will become a viable and beneficial alternative.
In the meantime, consider reducing your carbon footprint by carpooling, taking public transit, or riding a bamboo bicycle!
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PHOTO CREDIT: Bamboo forest in Kyoto, Japan (Unsplash)