ScienceDaily (Feb. 18, 2011) Let algae do the dirty work.
Researchers at Rochester Institute of Technology are developing biodiesel from microalgae grown in wastewater. The project is doubly “green” because algae consume nitrates and phosphates and reduce bacteria and toxins in the water. The end result: clean wastewater and stock for a promising biofuel.
The purified wastewater can be channeled back into receiving bodies of water at treatment plants, while the biodiesel can fuel buses, construction vehicles and farm equipment. Algae could replace diesel’s telltale black puffs of exhaust with cleaner emissions low in the sulfur and particulates that accompany fossil fuels.
Algae have a lot of advantages. They are cheaper and faster to grow than corn, which requires nutrient-rich soil, fertilizer and insecticide. Factor in the fuel used to harvest and transport corn and ethanol starts to look complicated.
In contrast, algae are much simpler organisms. They use photosynthesis to convert sunlight into energy. They need only water — ponds or tanks to grow in — sunlight and carbon dioxide.
“Algae — as a renewable feedstock — grow a lot quicker than crops of corn or soybeans,” says Eric Lannan, who is working on his master’s degree in mechanical engineering at RIT. “We can start a new batch of algae about every seven days. It’s a more continuous source that could offset 50 percent of our total gas use for equipment that uses diesel.”
Cold weather is an issue for biodiesel fuels.
“The one big drawback is that biodiesel does freeze at a higher temperature,” says Jeff Lodge, associate professor of biological sciences at RIT. “It doesn’t matter what kind of diesel fuel you have, if it gets too cold, the engine’s not starting. It gels up. It’s possible to blend various types of biodiesel — algae derived with soybeans or some other type — to generate a biodiesel with a more favorable pour point that flows easily.”
Lannan’s graduate research in biofuels led him to Lodge’s biology lab. With the help of chemistry major Emily Young, they isolated and extracted valuable fats, or lipids, algae produce and yielded tiny amounts of a golden-colored biodiesel. They are growing the alga strain Scenedesmus, a single-cell organism, using wastewater from the Frank E. Van Lare Wastewater Treatment Plant in Irondequoit, N.Y.
“It’s key to what we’re doing here,” Lodge says. “Algae will take out all the ammonia — 99 percent — 88 percent of the nitrate and 99 percent of the phosphate from the wastewater — all those nutrients you worry about dumping into the receiving water. In three to five days, pathogens are gone. We’ve got data to show that the coliform counts are dramatically reduced below the level that’s allowed to go out into Lake Ontario.”
Assemblyman Joseph Morelle, whose district includes Irondequoit, applauds RIT’s initiative. “Innovations developed at great academic institutions such as RIT will be key to solving many of the challenges we face, from revitalizing the upstate economy to the creation of clean, renewable energy sources for the future. Professor Lodge and Eric Lannan’s research bridges the gap between cost efficiency and environmental conservation and is a perfect example of how old problems can yield to new and creative solutions.”
Lodge and Lannan ramped up their algae production from 30 gallons of wastewater in a lab at RIT to 100 gallons in a 4-foot-by-7-foot long tank at Environmental Energy Technologies, an RIT spinoff. Lannan’s graduate thesis advisor Ali Ogut, professor of mechanical engineering, is the company’s president and CTO. In the spring, the researchers will build a mobile greenhouse at the Irondequoit wastewater treatment plant and scale up production to as much as 1,000 gallons of wastewater.
Northern Biodiesel, located in Wayne County, will purify the lipids from the algae and convert them into biodiesel for the RIT researchers.
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The above story is reprinted (with editorial adaptations by ScienceDaily staff) from materials provided by Rochester Institute of Technology.
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Article source: http://www.sciencedaily.com/releases/2011/02/110217151443.htm
It’s amazing what algae-technology could mean for the bioenergy and biofuels sector. A continuous yield of biomass over the year, which is more similar to the conveyance of fossil energy resources, but better for the climate, is something a lot of farmers would probably love.
And during the cultivation you do not depend so much on the climate as you would grow your plants on the field.
If you can combine the algae growth with cleaning sewage it sounds like a very effective way of producing biomass. You save the purchasing of fertilizer, because you get the “nutrients” for free and probably you also get paid by the administration for cleaning the sewage. AWESOME.
Thanks for the article.
Thanks for commenting on the post Ron it makes a lot of sense but sense is something governments and industry don’t seem to have.
I enjoyed your web site and linked to your blog (see blogroll)
Probably we should give the politicians some more time to understand the benefits of this combination
little-by-little the technology will grow, maybe not as fast as an algae, but it will…
I just realized, that sewage plants are a real powerhouse for bioenergy and it can produce biogas (sewage gas) AND deliver components (e.g. algae lipids) for liquid bioenergy as biofuels.
Thank you for the link and happy blogging!