Environmental Health and Safety (EH&S) provides waste management services to USC's academic and research community. EH&S prides itself on finding technology to help divert and recycle hazardous waste streams.
One solvent recycling method is blending chemicals with fuel. The fuel blending process uses high British Thermal Unit (BTU) waste streams as an alternative fuel to operate cement and aggregate kilns, boiler and industrial furnaces, or incinerators. Waste fuels must have a (BTU) value of at least 5,000 per pound to be considered for fuel blending.
Waste disposed of through fuel blending includes:
• Flammable Solvents
• Paint Waste
• Petroleum Products
• Solid to Energy Program
Because the cement manufacturing process requires extremely high temperatures (up to 3,500ºF), cement kilns are an ideal disposal technology for these types of waste streams. In this process, waste fuels are blended with a primary fuel source (coal or oil) to produce the extreme temperatures required to turn limestone into calcium oxide. The calcium oxide becomes a cement clinker. The clinker produced in the rotary cement kiln is ground, mixed with gypsum, and sold as Portland Cement.