Heartland Mat-Su Leachate Reduction

The Mat-Su Borough Landfill Leachate Reduction project addressed a critical need for sustainable wastewater management. Leachate, the liquid that collects at the base of landfill cells, was historically hauled to Anchorage for treatment, an increasingly costly practice as the landfill expanded. This project introduced a local treatment facility that now reduces operational costs, improves efficiency, and minimizes environmental impact.

Coffman provided civil, structural, mechanical, and electrical engineering for the leachate concentrator system. Civil design included grading, drainage, and site utilities. Structural engineering focused on the building foundation, load-bearing supports, and seismic restraints for major components, racks for electrical gear, along with a pre-engineered metal building (PEMB) to house process equipment. Mechanical and electrical design incorporated a new underground service and main distribution panel, delivering power to the concentrator skid, HVAC systems, lighting, and heat trace circuits. Integration of these systems required precise coordination to meet operational and safety standards.

The facility uses methane from the landfill as its primary energy source, reinforcing sustainability while reducing dependence on external power. The system captures contaminants such as PFAS and zinc, protecting groundwater and surrounding ecosystems. Within the first few months, the concentrator processed 600,000 gallons of runoff and is projected to save the Borough approximately $270,000 annually. Funded through the Alaska Department of Conservation Clean Water Program, the $5 million project marks a major milestone in cost-effective, environmentally responsible waste management for the Mat-Su region.