Feature
Written by Sabrina Deparine
Monday, 05 July 2010 12:58
A research team from the Biodesign Institute of the Arizona State University has achieved another milestone for the biofuel industry.
In the past week, news broke out that the team has made a new discovery: optimizing the growth conditions of blue-green algae (also known as cyanobacteria) to make these grow abundantly for biofuel production.
The blue-green algae is one of the most attractive feedstock options for biofuels because of its capability to produce 100 times the amount of clean fuel per acre as compared to other types of feedstock. Also, blue-green algae do not have any special requirements. It only requires sunlight, water and carbon dioxide. A few nutrients may be needed for it to survive and to grow exponentially and abundantly. Blue-green algae also eliminate the concerns over requiring vast lands for biofuel production. It can be grown on any location where there is sufficient supply of sunlight and carbon dioxide.
According to Raveender Vannela, a member of the research team, they had discovered the use of a photobioreactor in optimizing the growth of blue-green algae. The said photobioreactor utilizes solar photons as an energy source to convert carbon dioxide in reduced forms. This is epitomizes the cliché that goes “shooting two birds with one stone”. The bioreactor makes use of solar energy for it to run and its output benefits biofuel production. However, the process requires a more delicate and complex interplay of carbon dioxide, phosphorous and light radiation within the photobioreactor for it to optimize the growth of the algae.
For this experiment, Vannela and another researcher, Hyun Woo Kim made use of the Synechocystis PC6803 type of blue-green algae. These were cultivated in a benchtop photobioreactor and were supplied with BG-11, a customary growth medium. The carbon dioxide was manipulated along with the light irradiance and phosphorus content in the plant to boost its growth.
Based on the output of their experiment, it was concluded that blue-green algae are not able to maximize carbon dioxide in their growth cycle so they added phosphorous to the BG-11 medium. This resulted to higher biomass productivity. When the phosphorous has been consumed, the abundant growth of the algae is hampered by the light irradiation and carbon dioxide. What happens is the additional growth results to the crowding of biomass in the photobioreactor vessel so that it blocks the light. This issue can be resolved by more frequent harvesting of the reactor.
If this will be implemented on a large scale, the blue-green algae can get nutrients from other sources like waste streams or harvested biomass. This will form a close-loop, self-sustaining system that harness and produce energy from contaminants and carbon emissions.
Aside from biofuels, blue-green algae can also be used in the manufacturing of chemical-based materials like biopolymers and isoprenes which are used for industrial applications.
Read at-source
Friday, July 9, 2010
Solar-powered plane lands safely after 26-hour flight. BBC News
8 July 2010
The solar-powered plane lands near Bern
An experimental solar-powered aircraft launched on Wednesday has landed safely in Switzerland after successfully flying through the night.
The feat is a step toward the makers' aim of circling the globe using the power of the Sun to fuel the plane.
The aircraft used super-efficient solar cells and batteries to stay in the air after the Sun's rays had faded.
The plane touched down at an airfield about 30 miles (50 km) from the Swiss capital Bern at 0900 (0700 GMT).
The plane landed at Payerne airport after a total flight time of 26 hours.
During the flight it reached a height of 8,700 m (28,543 ft).
Assistants rushed to stabilise the experimental aircraft as it touched down, ensuring that its huge 63m (207ft) wingspan did not scrape the ground and topple the plane.
It is the longest and highest flight recorded by a solar-powered plane.
The four-engine aircraft was steered by Andre Borschberg, a former fighter jet pilot from Switzerland.
The plane has 12,000 solar cells arranged on its wingspan which collected enough energy to power the plane for the flight.
Read Full Story:
The solar-powered plane lands near Bern
An experimental solar-powered aircraft launched on Wednesday has landed safely in Switzerland after successfully flying through the night.
The feat is a step toward the makers' aim of circling the globe using the power of the Sun to fuel the plane.
The aircraft used super-efficient solar cells and batteries to stay in the air after the Sun's rays had faded.
The plane touched down at an airfield about 30 miles (50 km) from the Swiss capital Bern at 0900 (0700 GMT).
The plane landed at Payerne airport after a total flight time of 26 hours.
During the flight it reached a height of 8,700 m (28,543 ft).
Assistants rushed to stabilise the experimental aircraft as it touched down, ensuring that its huge 63m (207ft) wingspan did not scrape the ground and topple the plane.
It is the longest and highest flight recorded by a solar-powered plane.
The four-engine aircraft was steered by Andre Borschberg, a former fighter jet pilot from Switzerland.
The plane has 12,000 solar cells arranged on its wingspan which collected enough energy to power the plane for the flight.
Read Full Story:
Monday, June 28, 2010
SunPower Sets Solar Cell Efficiency Record at 24.2%. RenewableEnergyWorld.com
Published: June 24, 2010
California, United States -SunPower Corp. has produced a full-scale solar cell with a sunlight to electricity conversion efficiency of 24.2 percent at its manufacturing plant in the Philippines. This is a new world record for large area silicon wafers, and has been confirmed by the U.S. Department of Energy's National Renewable Energy Lab (NREL).
Read Full Story:
California, United States -SunPower Corp. has produced a full-scale solar cell with a sunlight to electricity conversion efficiency of 24.2 percent at its manufacturing plant in the Philippines. This is a new world record for large area silicon wafers, and has been confirmed by the U.S. Department of Energy's National Renewable Energy Lab (NREL).
Read Full Story:
Wednesday, June 23, 2010
APEC wants continued development of renewable energy. RenewableEnergyFocus.com
22 June 2010
Renewable energy technologies are declining in cost but continued efforts are required to further reduce this, according to energy ministers from the 21-country Asia-Pacific Economic Cooperation.
Solar, wind, geothermal and bioenergy for electricity, and biofuels for transport, are diversifying energy supply, and energy ministers urged “continued technology development efforts to further reduce their costs, standardise products, develop supply sources, and share best practices to accelerate their use in electricity generation, buildings and transport sectors.”
A declaration issued after their meeting in Fukui, Japan, directs APEC to “advance energy security, improve energy efficiency and increase the clean energy supply in the APEC region.”
Read Full Story:
Renewable energy technologies are declining in cost but continued efforts are required to further reduce this, according to energy ministers from the 21-country Asia-Pacific Economic Cooperation.
Solar, wind, geothermal and bioenergy for electricity, and biofuels for transport, are diversifying energy supply, and energy ministers urged “continued technology development efforts to further reduce their costs, standardise products, develop supply sources, and share best practices to accelerate their use in electricity generation, buildings and transport sectors.”
A declaration issued after their meeting in Fukui, Japan, directs APEC to “advance energy security, improve energy efficiency and increase the clean energy supply in the APEC region.”
Read Full Story:
Australia can have 100% renewable energy in a decade. RenewableEnergyFocus.com
23 June 2010
A combination of energy efficiency, fuel-switching and a combination of commercially-available renewable energy technologies could allow 100% of Australia’s energy needs to be met with renewable sources, according to a new report.
The Zero Carbon Australia 2020 Stationary Energy Plan was prepared by the environmental research group Beyond Zero Emissions. It was launched Tuesday at the Australian Parliament in Canberra.The plan outlines a “technically feasible and economically attractive way for Australia to transition to 100% renewable energy within 10 years,” with wind and concentrating solar thermal (CST) as the two primary technologies. Biomass and existing hydropower provide some backup.
Read Full story
A combination of energy efficiency, fuel-switching and a combination of commercially-available renewable energy technologies could allow 100% of Australia’s energy needs to be met with renewable sources, according to a new report.
The Zero Carbon Australia 2020 Stationary Energy Plan was prepared by the environmental research group Beyond Zero Emissions. It was launched Tuesday at the Australian Parliament in Canberra.The plan outlines a “technically feasible and economically attractive way for Australia to transition to 100% renewable energy within 10 years,” with wind and concentrating solar thermal (CST) as the two primary technologies. Biomass and existing hydropower provide some backup.
Read Full story
Video: Up Close and Personal with Stirling Energy's CSP. RenewableEnergyWorld.com
The Maricopa Solar project puts Stirling Energy Systems' SunCatcher to the test.
by Graham Jesmer, Video Producer
Published: June 21, 2010
Arizona, United States -- Just outside Phoenix, Arizona, sits a field of dishes reflecting the hot desert sun. Pulling up to the humming devices, installed by Stirling Energy Systems (SES) and Tessera Solar, the cars passing by on an adjacent road are dwarfed by their size.
This is the Maricopa Solar project, a 1.5-megawatt (MW) array of SunCatcher Systems (also known as the Stirling Dish Engine). In January NTR plc, which owns both SES and Tessera Solar, opened the plant after breaking ground just four months earlier.
Maricopa Solar is the first commercial project for the SunCatcher concentrating solar power (CSP) technology, which was designed and manufactured by SES. The SES SunCatcher is a 25-kilowatt solar power system that uses a 38-foot high, mirrored parabolic dish combined with an automatic tracking system to collect and focus the sun’s energy onto a Stirling engine to convert the solar thermal energy into grid quality electricity.
Read Full Story and Watch Video:
by Graham Jesmer, Video Producer
Published: June 21, 2010
Arizona, United States -- Just outside Phoenix, Arizona, sits a field of dishes reflecting the hot desert sun. Pulling up to the humming devices, installed by Stirling Energy Systems (SES) and Tessera Solar, the cars passing by on an adjacent road are dwarfed by their size.
This is the Maricopa Solar project, a 1.5-megawatt (MW) array of SunCatcher Systems (also known as the Stirling Dish Engine). In January NTR plc, which owns both SES and Tessera Solar, opened the plant after breaking ground just four months earlier.
Maricopa Solar is the first commercial project for the SunCatcher concentrating solar power (CSP) technology, which was designed and manufactured by SES. The SES SunCatcher is a 25-kilowatt solar power system that uses a 38-foot high, mirrored parabolic dish combined with an automatic tracking system to collect and focus the sun’s energy onto a Stirling engine to convert the solar thermal energy into grid quality electricity.
Read Full Story and Watch Video:
Wednesday, June 9, 2010
New Yeast Strain is Step Closer to Cellulosic Ethanol. Tonic.com
By David Bois | Tuesday, June 8, 2010 5:57 PM ET
Breakthrough yeast strain offers a move forward for efforts to make biofuels from a greater variety of non-food crops.
The promise of biofuels is genuine and sincere. Rather than taking carbon that's been fossilized for untold millions of years and sending it into our atmosphere the second we burn it, the manufacture and use of biofuels takes us much closer to greenhouse gas neutrality. Sure, the combustion of biofuels does produce carbon dioxide, but the plants from which the fuels are made remove carbon dioxide directly from the atmosphere as they grow. Additionally, ethanol just so happens to burn cleaner as compared to petroleum based hydrocarbons.
Still, I know that I'm hardly alone in finding it more than a little perverse to divert perfectly good crops away from the food supply toward the manufacturing of ethanol. Corn and sugar cane are currently prized for the making of ethanol, as their sugars are easily accessible for conversion to fuel. Our best long term hopes are in the realm of cellulosic ethanol, made from more fibrous plant matter such as the stalks of the corn as well as such woodier, non-food plants as switchgrass. Switchgrass is particularly appealing due to it being a relatively low-effort crop which grows easily in a range of conditions, as well as to its high potential energy value.
So far, the challenges to cellulosic ethanol really taking off hinge on the effort (and by extension, the cost) required to get at the sugars that they contain. The additional effort required to make ethanol from fibrous plant material as compared to making it from corn pretty much doubles the cost. It's a stated goal of the federal government to make cellulosic ethanol much more cost-competitive, and ongoing research and development breakthroughs continue to bring these production costs down. And a just-announced finding by researchers at Indiana's Purdue University will no doubt help things along this path.
As PhysOrg has reported, an agricultural and bioengineering research team at Purdue has successfully genetically engineered a strain of yeast that is capable of converting the sugars contained in woodier plant materials such as corn stalks and switchgrass. An added and beneficial characteristic of the new strain of yeast is its resistance to acetic acid. Acetic acid is a common component of plant life and is given off along with the sugars, but it can hinder the fermentation activity that the yeast provides, slowing the conversion process and ultimately decreasing the yield of ethanol.
The Purdue team's research, currently published in the journal Applied Microbiology and Biotechnology, is supported by funding from the US Department of Energy and will reportedly pursue even more improvements to the yeast's efficiency and resistance to chemical agents that slow the sugar-to-ethanol conversion process.
Read at-source:
Breakthrough yeast strain offers a move forward for efforts to make biofuels from a greater variety of non-food crops.
The promise of biofuels is genuine and sincere. Rather than taking carbon that's been fossilized for untold millions of years and sending it into our atmosphere the second we burn it, the manufacture and use of biofuels takes us much closer to greenhouse gas neutrality. Sure, the combustion of biofuels does produce carbon dioxide, but the plants from which the fuels are made remove carbon dioxide directly from the atmosphere as they grow. Additionally, ethanol just so happens to burn cleaner as compared to petroleum based hydrocarbons.
Still, I know that I'm hardly alone in finding it more than a little perverse to divert perfectly good crops away from the food supply toward the manufacturing of ethanol. Corn and sugar cane are currently prized for the making of ethanol, as their sugars are easily accessible for conversion to fuel. Our best long term hopes are in the realm of cellulosic ethanol, made from more fibrous plant matter such as the stalks of the corn as well as such woodier, non-food plants as switchgrass. Switchgrass is particularly appealing due to it being a relatively low-effort crop which grows easily in a range of conditions, as well as to its high potential energy value.
So far, the challenges to cellulosic ethanol really taking off hinge on the effort (and by extension, the cost) required to get at the sugars that they contain. The additional effort required to make ethanol from fibrous plant material as compared to making it from corn pretty much doubles the cost. It's a stated goal of the federal government to make cellulosic ethanol much more cost-competitive, and ongoing research and development breakthroughs continue to bring these production costs down. And a just-announced finding by researchers at Indiana's Purdue University will no doubt help things along this path.
As PhysOrg has reported, an agricultural and bioengineering research team at Purdue has successfully genetically engineered a strain of yeast that is capable of converting the sugars contained in woodier plant materials such as corn stalks and switchgrass. An added and beneficial characteristic of the new strain of yeast is its resistance to acetic acid. Acetic acid is a common component of plant life and is given off along with the sugars, but it can hinder the fermentation activity that the yeast provides, slowing the conversion process and ultimately decreasing the yield of ethanol.
The Purdue team's research, currently published in the journal Applied Microbiology and Biotechnology, is supported by funding from the US Department of Energy and will reportedly pursue even more improvements to the yeast's efficiency and resistance to chemical agents that slow the sugar-to-ethanol conversion process.
Read at-source:
Saturday, June 5, 2010
Giant Inflatable Airship Powered by Algae. AlternativeEnergy
June 1st, 2010
This summer, piloted by Captain Allan Judd, Bullet 580 will usher in the return of inflatable giant airships. The 235 ft long and 65ft diameter ship is covered with a type of Kevlar, a material 10 times-stronger than steel but only one sixteenth of an inch thick. An E-green design special costing £5.5million, this giant runs on algae – latest bio-fuel that can be developed from brackish and waste water.
Read Full Story
Subscribe to:
Posts (Atom)