From Algae World News

Columbus Junction could count itself among pioneering cities in the struggle to treat wastewater if the city council approves new technology that favors algae over bacteria. Columbus Junction is considering installing a system developed by Gross-Wen Technologies to treat its wastewater. The patent-pending revolving algal biofilm treatment technology, or RAB, grows micro algae on vertical belts that rotate in and out of the wastewater. During the rotation, nitrogen and phosphorus are transferred from the wastewater to the algae. The algae also takes out ammonia and other contaminants from the wastewater.