1. Sanitary landfills are disposal sites for non-hazardous solid wastes spread in layers, compacted to the smallest practical volume and covered by material applied at the end of each operating day.
2. Secure chemical landfills are disposal sites for hazardous waste, selected and designed to minimize the chance of release of hazardous substances into the environment. As a renewable energy source
3. Milliken harvests methane gas from local landfills in LaGrange, Georgia and Spartanburg, South Carolina. See Methane.