First-of-its-kind Sustainable Landfill in Texas Becomes a Global Model
The City of Denton Landfill (Texas, USA) reportedly is the first in the world to implement “closed-loop waste management.” This technique combines landfill gas (LFG) capture with landfill mining to sort out and recover reusable and re-sellable plastics and metals, as well the remaining organic material for conversion to biomass energy pellets. Mining reduces the volume of material enough (by an estimated 95%) for the fill space itself to be re-used for new waste placement, thereby extending the life of the landfill essentially indefinitely (i.e., perpetual landfill). Dr. Sahadat Hossain, of the Solid Waste Institute for Sustainability (SWIS) at the University of Texas Arlington, developed this perpetual landfill model to be cost-efficient and potentially profitable. The roughly 20-year cyclical process significantly reduces the need for long-term environmental monitoring, one of the greatest legacy costs of landfill management. It also reduces a municipality’s land acquisition costs for future landfill sites, while providing a revenue stream in the forms of cheap, locally-produced energy and reusable materials.