Posts Tagged: biofuel
Giant King Grass harvested at UC research center
Giant King Grass is a fast-growing, high-yield grass that grows under a variety of soil conditions, according to Viaspace Green Energy Inc. It is propagated vegetatively and, with sufficient rain or irrigation, can grow 15 to 18 feet high in six months.
At the UC Desert Rec, scientists compared two planting processes:
- Planting single nodes that grow into individual plants with some space between them.
- Planting whole stalks continuously end to end, which results in a dense row of plants about six inches apart.
Preliminary results showed the whole stalk planting germinated earlier and grew more quickly. The individual plants had a significant number of skips where the nodes failed to germinate.
Two harvesting regimens were tested:
- Harvest when the plant is 6 to 8 feet tall every two months for animal feed and to produce biogas for anaerobic digestion.
- Harvest when the plant is 15 to 18 feet tall for bioenergy applications, such as direct combustion in a power plant, energy pellets or cellulosic biofuels.
"It was 108 degrees when I arrived in Holtville last Monday evening (Sept. 8, 2014) at 6 p.m.," said Carl Kukkonen, CEO of Viaspace. "Giant King Grass is planted in the worst soil at the University of California site, and still the results are good. I am pleased that Giant King Grass grows well in this extremely hot and dry environment."
Biodigester turns campus waste into campus energy
Last week, on Earth Day, the university and Sacramento-based technology partner CleanWorld unveiled the UC Davis Renewable Energy Anaerobic Digester (READ) at the campus' former landfill. Here, the anaerobic digestion technology Zhang invented is being used inside large, white, oxygen-deprived tanks. Bacterial microbes in the tanks feast on campus and community food and yard waste, converting it into clean energy that feeds the campus electrical grid.
“This technology can change the way we manage our solid waste,” Zhang said. “It will allow us to be more economically and environmentally sustainable."
It is the third commercial biodigester CleanWorld has opened using Zhang's technology within the past two years and is the nation's largest anaerobic biodigester on a college campus.
The system is designed to convert 50 tons of organic waste to 12,000 kWh of renewable electricity each day using state-of-the-art generators, diverting 20,000 tons of waste from local landfills each year. It is expected to reduce greenhouse gas emissions by 13,500 tons per year.
The READ BioDigester encompasses several of the university's goals: reducing campus waste in a way that makes both economic and environmental sense, generating renewable energy, and transferring technology developed at UC Davis to the commercial marketplace.
The biodigester will enable the more than 100 million tons of organic waste each year that is currently being landfilled in the U.S. to be converted to clean energy and soil products. The READ BioDigester is a closed loop system, moving from farm to fork to fuel and back to farm. Whatever is not turned into biogas to generate renewable electricity can be used as fertilizer and soil amendments — 4 million gallons of it per year, which could provide natural fertilizers for an estimated 145 acres of farmlands each day.
Nearly half of the organic waste, or feedstock, needed to operate the biodigester to full benefit will come from UC Davis dining halls, animal facilities and grounds. CleanWorld is working with area food processing and distribution centers to supply the remaining amount. Meanwhile, UC Davis will earn 100 percent of the project's green energy and carbon credits and receive all of the electricity generated.
Anaerobic digestion is an age-old process. However, Zhang's patented technology made it more efficient — capable of eating a broader variety and bigger quantity of waste, turning it into clean energy faster and more consistently than other commercial anaerobic biodigesters.
View a video about the UC David biodigester here:
(This blog post is condensed from a UC Davis news release about the biodigester.)
Additional information:
- Read the full press release
- Download biodigester photos
- Vine video: From lunch to lights
- Visit http://www.cleanworld.com/
Biofuel research may keep tobacco industry from going up in smoke
Research success would allow farmers who have been growing tobacco for generations to continue the tradition for a different purpose, while taking advantage of an infrastructure established to serve the diminishing cigarette, cigar and snuff markets.
Peggy G. Lemaux, UC Cooperative Extension specialist, and Anastasios Melis and Krishna Niyogi, Agricultural Experiment Station faculty in the Department of Plant and Microbial Biology at UC Berkeley, are lead researchers in the project.
“There are several reasons we are modifying tobacco to produce biofuel,” Lemaux said, “It is a high biomass crop. If you want to extract oil, then the more biomass you have, the more oil you get. And, since tobacco is not a food source, tobacco production for biofuel would not have an impact on global food markets or find its way into the food supply. Finally, tobacco farmers are anxious to produce a product that is more acceptable to the public."
However, there are no tobacco varieties that produce oil at high levels. Scientists know that certain algae do turn sunlight energy into oil, and that sparked an idea.
A research consortium that includes Lemaux, Melis and Niyogi and researchers at the Lawrence Berkeley National Laboratory and the University of Kentucky is taking genes, primarily from algae, that produce oil and inserting them into tobacco plants to make oils in leaves.
To do that, the consortium scientists are using very small pieces of tobacco leaves to introduce the desired algal genes, where they become a heritable trait of the tobacco plant. The small pieces of leaf tissue are then placed in a Petri dish, the tissues that contain the introduced genes identified, and then the tissues grow into a new plant, every cell of which contains the algal genes.
“We hope the new plant will make the same kind of oils that algae do,” Lemaux said. “We can then use organic solvents to extract the oils out of the leaves.”
Much more research is required before tobacco plants that produce biofuel at commercial levels will be available to growers, but Lemaux is encouraged by the preliminary results.
The research is funded with a three-year $4.8 million grant from a U.S. Department of Energy, Advanced Research Projects Agency – Energy program termed PETRO, Plants Engineered to Replace Oil. ARPA-E funds high-risk, high-reward research projects to find potential alternatives to fossil fuels.
See a video about this research below:
UC looks into a 'healthier' way to use tobacco
Converting tobacco into cigarettes is a dwindling industry, so scientists are looking for an alternative use for the product grown by tobacco farmers, said an article in the New York Times Green Blog.
Peggy Lemaux, UC Cooperative Extension specialist in the Department of Plant and Microbial Biology at UC Berkeley, shared the idea at the annual meeting of Advanced Research Projects Agency-Energy, an agency founded to nurture interesting energy ideas that may or may not work.
Some bacteria and algae turn sunlight into oils that can be burned in a car engine or used as raw material at a refinery in place of crude oil. A research consortium that includes the Lawrence Berkeley National Laboratory, UC Berkeley and the University of Kentucky has taken genes from those types of bacteria and algae and inserted them into tobacco plants. In the first year of work, the efforts produced a crop and organic solvents were used to extract the oils out of the leaves.
For an overview, see the video below:
Firm partners with Kaffka to develop biofuel
A key issue with biofuel production has been the need for inexpensive feedstocks that do not compete with agricultural land use or food production.
To develop low-impact feedstock suitable for underutilized land, the company is partnering with Stephen Kaffka, UC Cooperative Extension specialist in the Department of Plant Sciences at UC Davis.
Kaffka plans to study the viability of oilseed crops for biofuel in test plots at UC Davis and in Salinas, the Imperial Valley and Five Points in the Central Valley. To test the feedstock for commercial farming use, Kaffka will plant the crops at John Diener's 5,400-acre Red Rock Ranch in the Central Valley, which produces 40 conventional and organic crops.
“I will do the agronomic work on new oilseed crops for my part of the grant, but there are a large number of other activities in the grant as well,” Kaffka said. “My goal is to be of service in support of emerging bioenergy groups in California.”
“We are very pleased with the work Dr. Kaffka has been doing, and look forward to working with him to develop the potential for new bioenergy crops in California,” said Russell Teall, president and founder of Biodico, the parent company of Biodiesel Industries of Ventura.