Producing ethanol from agricultural waste a step closer
Research conducted by Delft University of Technology has brought the efficient production of ethanol from (woody) biomass a great deal closer to fruition. The work [*.pdf] of researcher Marko Kuyper was an important factor in this. His research in recent years has greatly improved the conversion of certain sugars from agricultural waste to bio-ethanol, using genetically modified yeast strains. Kuyper introduced a gene that is found in a fungus that thrives in elephant dung, into the baker's yeast (Saccharomyces cerevisiae) that is used to ferment sugars.
The vision of integrated biorefineries, where the entire biomass stream (including lignocellulose) is used, comes another step closer.
The search for alternatives to the current, oil-based, fuels is the focus of great interest around the world. One of the most attractive alternatives is bio-ethanol - alcohol produced from agricultural crops. At present, bio-ethanol is only made from sugars derived from corncobs, sugar beets, grain and sugarcane, with the help of baker’s yeast. A great number of by-products result from the cultivation of these crops, such as straw and corn husks. It would be a major step forward if this leftover material, which also largely consists of sugar, could be used for the production of bio-ethanol. This would allow agricultural land to be used more efficiently and at the same time prevent competition with food supplies.
Until recently, the problem was that the complex mixture of sugars that makes up these leftover materials could not be efficiently converted into ethanol by the baker’s yeast. Delft University of Technology, however, has recently devised a solution for this, which is achieved by genetically modifying the baker’s yeast. The Delft researchers have inserted a gene (derived from a fungus that is found in elephant faeces) into baker’s yeast, allowing it to convert an important sugar type, xylose, into ethanol, thereby making the production of bio-ethanol from supplies of leftover materials possible.
During his recent PhD research, Marko Kuyper greatly improved this method: people can now start using agricultural waste products that contain sugar to produce bio-ethanol on an industrial scale. Delft University of Technology and the Kluyver Centre for Genomics of Industrial Fermentation are working together on this project with Royal Nedalco and BIRD Engineering. These parties expect to achieve large-scale industrial implementation within 5 years.
Delft University of Technology.
Article continues
The vision of integrated biorefineries, where the entire biomass stream (including lignocellulose) is used, comes another step closer.
The search for alternatives to the current, oil-based, fuels is the focus of great interest around the world. One of the most attractive alternatives is bio-ethanol - alcohol produced from agricultural crops. At present, bio-ethanol is only made from sugars derived from corncobs, sugar beets, grain and sugarcane, with the help of baker’s yeast. A great number of by-products result from the cultivation of these crops, such as straw and corn husks. It would be a major step forward if this leftover material, which also largely consists of sugar, could be used for the production of bio-ethanol. This would allow agricultural land to be used more efficiently and at the same time prevent competition with food supplies.
Until recently, the problem was that the complex mixture of sugars that makes up these leftover materials could not be efficiently converted into ethanol by the baker’s yeast. Delft University of Technology, however, has recently devised a solution for this, which is achieved by genetically modifying the baker’s yeast. The Delft researchers have inserted a gene (derived from a fungus that is found in elephant faeces) into baker’s yeast, allowing it to convert an important sugar type, xylose, into ethanol, thereby making the production of bio-ethanol from supplies of leftover materials possible.
During his recent PhD research, Marko Kuyper greatly improved this method: people can now start using agricultural waste products that contain sugar to produce bio-ethanol on an industrial scale. Delft University of Technology and the Kluyver Centre for Genomics of Industrial Fermentation are working together on this project with Royal Nedalco and BIRD Engineering. These parties expect to achieve large-scale industrial implementation within 5 years.
Delft University of Technology.
Article continues
Thursday, June 15, 2006
The Global Benefits of Biofuels - a quick overview
Last week, the German Agency for Technical Cooperation's report (written for the Worldwatch Institute) was presented [see earlier post], and it looks at exactly the issues we're addressing here at the BioPact.
The Globalist read the report too, and made an interesting Q & A on the global potential biofuels have for economic and social development in the "third" world. Obviously they are a bit overly optimistic and not very critical, but enjoy their enthusiasm, and then think with us about the more problematic issues surrounding global biofuels exchanges (why not join our forum?)
Q: What impacts can biofuel have on the developing world?
A: Of the world's 47 poorest countries — 38 are net oil importers and 25 of these import all of their oil. Yet many of these countries have substantial agricultural bases and are well-positioned to grow highly productive energy crops.
Energy crops have the potential to reduce GHG emissions by more than 100%
Q: How efficient is biofuel production and how can it influence unemployment?
A: The World Bank reports that biofuel industries require about 100 times more workers per unit of energy produced than the fossil fuel industry. The ethanol industry is credited with providing more than 200,000 jobs in the United States and half a million direct jobs in Brazil.
Q: How much does current fossil fuel use contribute to greenhouse gasses?
A: Transportation, including emissions from the production of transport fuels, is responsible for about one-quarter of energy-related greenhouse gas (GHG) emissions and that share is rising.
Q: What impact can the use of biofuels have on greenhouse gas emissions?
A: Energy crops have the potential to reduce GHG emissions by more than 100% (relative to petroleum fuels) because such crops can also sequester carbon in the soil as they grow.
Q: Just how much reduction are we talking about?
A: Estimated GHG reductions for biofuel feedstock include a 70-110% reduction for fibers such as switchgrass and poplar, 65-100% wastes like waste oil, harvest residues and sewage, 40-90% for sugars such as sugar cane and sugar beet, 45-75% for vegetable oils including rapeseed, sunflower seed and soybeans — and 15-40% for starches such as corn and wheat.
Q: What are the future implications of biomass energy?
A: In the future, the type of processing energy used will be more relevant. A biofuel plant that uses biomass energy will contribute far more to reducing GHG emissions than one using coal energy.
Of the world's 47 poorest countries — 38 are net oil importers and 25 of these import all of their oil.
Q: How much has Brazil invested in the production of biofuels?
A: Between 1975 and 1987, ethanol saved Brazil $10.4 billion in foreign exchange while costing the government $9 billion in subsidies.
Q: But, has this investment paid off?
A: Even with subsidies, the economic savings with biofuels from avoided oil imports can be considerable and this investment paid off even more in subsequent years. Studies show that from 1976-2004, Brazil's ethanol production substituted for oil imports worth $60.7 billion — or as much as $121.3 billion including the avoided interest that would have been paid on foreign debt (based on debt previously incurred importing oil).
Q: How can increased biofuel production benefit farmers?
A: In Brazil, the government hopes to build on the success of the Proálcool ethanol program by expanding the production of biodiesel. All diesel fuel must contain 2% biodiesel by 2008 and 5% by 2013. The government hopes to ensure that poor farmers in the north and northeast receive a fair share of the economic benefits of biodiesel production.
Q: Are other South American countries expanding the use of ethanol?
A: As of early 2006, Columbia mandates that all gasoline sold in cities with populations exceeding 500,000 contain 10% ethanol. In Venezuela, the state oil company is supporting the construction of 15 sugar cane distilleries over the next five years as the government phases in a national E10 (10% ethanol) blending mandate.
Q: How has Brazil influenced ethanol production in the region?
A: In Bolivia, 15 distilleries are being constructed, and the government is considering authorizing blends of E25. Costa Rica and Guatemala are also in the trial stages for expanding production of sugar cane fuel ethanol. Many of these countries have learned from the experience of Brazil — the world leader in fuel ethanol.
Between 1975 and 1987, ethanol saved Brazil $10.4 billion.
Q: How much ethanol does China intend to use for transportation fuel?
A: In China, the government is making E10 blends mandatory in five provinces that account for 16% of the nation's passenger cars.
Q: What about in Southeast Asia?
A: In Southeast Asia, Thailand, eager to reduce the cost of oil imports while supporting domestic sugar and cassava growers, has mandated an ambitious 10 % ethanol mix in gasoline starting in 2007.
Q: And elsewhere in the region?
A: For similar reasons, the Philippines will soon mandate 2% biodiesel to support coconut growers and 5% ethanol — likely beginning in 2007. In Malaysia and Indonesia the palm oil industry plans to supply an increasing portion of national diesel fuel requirements.
Q: Where does India fit into the mix?
A: In India, a rejuvenated sugar ethanol program calls for E5 blends throughout most of the country. The government plans soon — depending on ethanol availability — to raise this requirement to E10 and then E20.
Transportation is resonsible for about one-quarter of energy-related greenhouse gas emissions.
Q: What African nations have the capacity to meet the growing ethanol demand?
A: In Africa, efforts to expand biofuels production and use are being initiated or are under way in numerous countries, including Benin, Ethiopia, Ghana, Guinea Bissau, Kenya, Malawi, Mozambique, Nigeria, Senegal, South Africa and Zimbabwe.
The Globalist.
Article continues
posted by Biopact team at 11:07 PM 0 comments links to this post