Gross-Wen Technologies: Using Algae to Clean City Sewage
A pioneering enterprise formed to treat municipal and industrial wastewater with algae hopes to launch into large-scale operation this summer with construction of its first functional, city-sized test facility in Dallas Center, Iowa.
Gross-Wen Technologies, a company launched by Iowa State University researcher Martin Gross and professor Zhiyou Wen, has been working for roughly two years on plans to turn its discoveries into a two-pronged business. The Gross-Wen approach uses tanks of wastewater, vertical conveyor belts, and a special biofilm to grow and harvest the algae. Once water treatment is complete, the algae can be scraped off the belts and sold as a fertilizer, effectively subsidizing the cost of running a large-scale treatment system.7