This could be more cost effective than closed bioreactors.


"The first real-world, demonstration-scale project in Nevada for
turning algae into biofuel has successfully completed the initial
stage of research at the University of Nevada, Reno. The project
is on track to show the process is an economical, commercially
viable renewable energy source in Nevada."

http://www.unr.edu/nevadanews/templates/details.aspx?articleid=4810&zoneid=40

Best Wishes,
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Gabriel L. Espinosa