PNNL researcher Michael Huesemann (front, left) is leading a multi-laboratory plan that is developing a new streamlined process to quickly pare down heaps of algae species into just a few that hold the most promise for making biofuel.
PNNL's Lab Environmental Algae Pond Simulator system, also known as LEAPS, mimics the frequently shifting water temperatures and lighting conditions that occur in outdoor ponds at any given place on earth. This allows researchers to test multiple algae strains with the conditions at different places, but without the cost and time needed to actually grow them at those locations.
PNNL biochemical engineer Mattias Greer examines algae samples for their suitability to make biofuel.
one of one
SEQUIM, Wash. - A dozen glass cylinders containing a potential payload of bright green algae are exposed to hundreds of multi-colored lights, which provide all of sunlight's natural hues. The tiny LEDs brighten and dim to mimic the outdoors' constantly changing conditions. To further simulate a virtual cloud passing overhead, chillers kick in and nudge the algae a little cooler.
A new, approximately $6-million collaborative plan is using this unique climate-simulating Lab system as part of a new streamlined process to quickly pare down heaps of algae species into just a few that hold the most promise for renewable fuels.
Discovering which algae species is best suited to make biofuel is no small task. Researchers have tried to evaluate algae in test tubes, but often find lab results don't always mirror what happens when green goo is grown in outdoor ponds.
The Algae DISCOVR Plan - short for Development of Integrated Screening, Cultivar Optimization and Validation Research - is trying out a new approach that could reduce the cost and the time needed to move promising algal strains from the Lab and into production. At the end of the three-year pilot project, scientists hope to identify 4 promising strains from at least 30 initial candidates.
"Algae biofuel is a promising clean energy technology, but the current production methods are costly and limit its use," said the project's lead researcher, Michael Huesemann of the D.O.E.'s Pacific Northwest National Lab. "The price of biofuel is largely tied to growth rates. Our method could help developers find the most productive algae strains more quickly and efficiently."
Algae can be turned into renewable biofuel, which is why scientists want to discover an inexpensive, fast-growing strain of algae. Scientists at Pacific Northwest National Lab have developed a system to speed up this search. The unique climate-simulating system uses temperature controls and multi-colored LED lights to mimic the constantly changing conditions of an outdoor algae pond. By simulating outdoor climates inside the lab, the system saves researchers time and expense.
Step by step
The project's early work relies on PNNL's Lab Environmental Algae Pond Simulator mini-photobioreactors, also known as LEAPS. The system mimics the frequently shifting water temperatures and lighting conditions that occur in outdoor ponds at any given place on earth. The system consists of glass column photobioreactors that act like small ponds and are placed in rows to allow scientists to simultaneously grow multiple different types of algae strains. Each row of LEAPS mini-photobioreactors is exposed to unique temperature and lighting regimens thanks to heaters, chillers and heat exchangers, as well as colored lights simulating the sunlight spectrum - all of which can be changed every second.
The 1st phase of the team's multi-step screening process uses PNNL's photobioreactors to cultivate all 30 strains under consideration and evaluate their growth rates. Algae strains with suitable growth will be studied further to measure their oil, protein and carbohydrate content, all of which could be used to make biofuels. The algae will also be tested for valuable co-products such as the food dye phycocyanin, which could make algae biofuel production more cost-effective. The 1st phase will also involve evaluating how resistant strains are to harmful bacteria and predators that can kill algae.
Next, the team will look for strains that produce 20 percent more biomass, or organic matter used to make biofuel, than 2 well-studied algae strains. The top-performing strains will then be sorted to find individual cells best suited for biofuel production, such as those that contain more oil. Those strains will also be exposed to various stresses to encourage rapid evolution so they can, for example, survive in the higher temperatures outdoor ponds experience in the summer.
Outside the box
After passing those tests, the remaining strains will be grown in large outdoor ponds in Arizona. Researchers will examine how algae growth in the outdoor ponds compares with the algal biomass output predicted in earlier steps. Biomass will also be harvested from outdoor-grown algae for future studies.
Finally, the team will further study the final algae strains that fare best outdoors to understand how fast they grow in different lighting and temperature conditions. That data will then be entered into PNNL's Biomass Assessment Tool, which uses detailed data from weather stations and other sources to identify the best possible locations to grow algae. The tool will crunch numbers to help the team generate maps that illustrate the expected biomass productivity of each algae species grown in outdoor ponds at any location in the U.S.
Data and strains will be made public in the hopes that algae companies and other researchers will consider growing the most productive strains identified by the project.
Potential future work not included in the current Plan could include converting harvested algae into biofuels, examining operational changes such as crop rotation to further increase biomass growth, and assessing the technical feasibility and economic costs of making biofuel from algae selected through this process.
Interdisciplinary teams at Pacific Northwest National Lab address many of America's most pressing issues in energy, the environment and national security through advances in basic and applied science. Founded in 1965, PNNL employs 4,400 staff and has an yearly budget of nearly $1 billion. It is managed by Battelle for the D.O.E.'s Office of Science. As the single biggest supporter of basic research in the physical sciences in the United States, the Office of Science is working to address some of the most pressing challenges of our time. For more information on PNNL, visit the PNNL News Center, or follow PNNL on Facebook, Google+, Instagram, LinkedIn and Twitter.
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