Landfills( Sanitary landfills)(填埋、卫生填埋) The role of landfills in MsW disposal Landfill has been Gas recovery Methane the cheapest methods of msw disposal. Today, treatmen about 55% of MSW from the united States and 80% of Canadian MSW goes into landfills Groundwater Fig. 10 Structure of landfillLandfills (Sanitary landfills）（填埋、卫生填埋） ◆ The role of landfills in MSW disposal Landfill has been the cheapest methods of MSW disposal. Today, about 55% of MSW from the united States and 80% of Canadian MSW goes into landfills. Fig. 10 Structure of landfill