Antifreeze is recycled by removing contaminants, including heavy metals and emulsified oils, and introducing additives to restore antifreeze properties. Such additives increase the pH, inhibiting corrosion and rust among, according to the U.S. Environmental Protection Agency.
Contemporary technology allows the recycling of antifreeze on location at industrial sites or automobile repair businesses that use a great deal of the solution. This results in a significant cost savings for generators of spent antifreeze, according to the EPA. Recycling antifreeze also conserves ethylene glycol, a primary ingredient in antifreeze and a product of natural gas, a nonrenewable resource. The average antifreeze lasts for two or three years.