A boiler heats the tank contents to a temperature of about 160 degrees. In approximately 24 hours, the contents separate into four distinct layers: rich brown grease (a valuable commodity sold directly as a biofuel or as feedstock for biodiesel); debris; water; and food particles. The brown grease can be pumped out and sold while the remaining content, which is pasteurized and nearly oil free, may be land-applied or discharged into a sewage treatment facility. The Greasezilla® unit runs on brown grease; about 5 percent of the brown grease produced in each batch is pumped back into the system and used as fuel.
A standard Greasezilla® system includes dual 10,000-gallon, double-wall, insulated steel tanks. Two tanks increase efficiency. As one tank processes the other can be harvested, drained and reloaded. A full tank weighs about 95,000 pounds, so any commercial building with a concrete slab can handle the weight. The unit requires no special electrical upgrades.
Greasezilla® eases the financial sting of ever-increasing disposal fees, labor costs and transportation expenses associated with trips to further treatment and waste water plants. In addition, it generates another revenue stream by selling brown grease and/or processing grease for other pumpers.