Industrial Dryers - Waste Sludge to Renewable Fuels Gryphon Environmental, Inc. advanced drying technology that converts waste streams into beneficial materials. Both the economic and environmental impacts are very attractive for Gryphon clients. Landfill of sludge with high water content is a costly expense for municipal WWT plants and industry alike. Gryphon technology eliminates this Operating Cost and liability while producing dry residuals that may be used as fertilizer or converted to materials that generate income.