The document discusses various aspects of landfill systems including types of landfills, landfill operation methods, landfill gas, leachate, landfill liners, and final closure. It describes the main types as hazardous, sanitary, and open dumps. Key aspects of landfill operation discussed include the gases produced via anaerobic decomposition and methods such as area, trench, open pit, and canyon. Design considerations for landfills include geometry, liners, leachate and gas collection.