This week Qteros, a startup in Marlborough, MA, announced a major milestone. The company, which was a microbiologist founded after discovering an organism that devours woody biomass and other cellulosic materials and excretes ethanol, has shown that the bacteria it uses can produce high concentrations of ethanol. The company says this makes its process for converting cellulosic plant materials into ethanol “more economical than any other process to date.”
Increasing the concentration of ethanol lowers the cost of ethanol production in many ways. As the bacteria break down plant matter, they produce a beer-like broth containing ethanol and water. The lower the concentration of ethanol in the water, the more expensive it becomes to distill pure ethanol (more water is needed for the process, and the processing plant needs to be bigger and more expensive).
Qteros’s chief technology officer, Kevin Gray, says that for making ethanol from cellulosic sources, the target is to produce a broth with 5 percent ethanol by weight. This is well above the less than 1 percent by weight that the company’s organism produced when the company first started working with it, he says. Now Qteros researchers, by optimizing the conditions in which they grow the organism and the nutrients they provide, have increased the broth concentration to 7 percent ethanol by weight (9 percent by volume).
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