Gross-Wen Technologies
About
Gross-Wen Technologies (GWT), headquartered at 404 Main Street in Slater, Iowa, develops and commercializes algae-based wastewater treatment systems using its patented Revolving Algal Biofilm (RAB) technology. The RAB system employs vertically oriented conveyor belts that grow algae on their surface, where the biomass absorbs nitrogen and phosphorus from wastewater while utilizing sunlight and atmospheric CO2. Harvested algae is pelletized and purchased back by GWT for sale as slow-release algal-based fertilizer, creating a revenue stream that offsets treatment costs. The system operates with ultra-low energy input, requires no chemical additions, and recovers nutrients rather than simply removing them. GWT serves three primary markets: municipal wastewater treatment including tertiary, secondary, and primary treatment plus anaerobic digestate nutrient recovery; industrial food and beverage processing including corn and grain facilities; and agricultural operations including dairy. Full-scale operational installations are running in Pasco, Washington; Iowa City, Iowa; and Slater, Iowa, with additional installations in Sioux City and Muscatine, Iowa; Wahoo, Nebraska; and York, United Kingdom. Pilot projects span from Chicago's O'Brien and Stickney facilities to Singapore. The RAB system is positioned as the most cost-effective sustainable alternative to conventional nutrient removal methods, claiming the lowest life-cycle costs on the market. GWT holds the trademark for the tagline 'We don't just think green, we grow it.'
Key Products
Patented algae-based wastewater treatment technology using vertically oriented conveyor belts that grow algae to absorb nitrogen and phosphorus from wastewater, producing harvestable biomass as a valuable byproduct
Harvested algae byproduct pelletized and purchased back by GWT for use as slow-release algal-based fertilizer, creating a revenue offset for system operators
RAB system configured for municipal wastewater plants to achieve advanced nutrient removal at tertiary treatment stage
RAB system configured to recover nutrients from anaerobic digester supernatant, reducing loading on the main treatment process
RAB system scaled for industrial food and beverage wastewater with high organic and nutrient loading, as deployed at corn and grain processing facilities
RAB system adapted for dairy and agricultural wastewater treatment with nutrient recovery capabilities
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