Harrison Power Station Landfill

Harrison County, West Virginia

The Harrison project is one of the largest passive treatment systems yet constructed for coal combustion residual landfill (CCL) leachate. In addition to trace metals in the leachate, design of this system had to accommodate future addition of acid drainage from abandoned coal mine sources around the facility.   

Project Overview


  • The treatment approach removed aluminum, arsenic, and iron by co-precipitation in a pair of oxidation/precipitation basins, followed by three aerobic wetland cells for polishing of these parameters. 
  • A pair of vertical flow organic cells operating in parallel then removed selenium and hexavalent chromium in a reducing environment. Two more wetland cells and a pair of manganese-oxidizing beds (MOBs) completed the system. 
  • The treatment capacity of the system was tested by increasing the amount of mine drainage added to the influent and the system maintained compliance with the increased pollutant loading.
  • Maintenance involves an annual clearing of standing vegetation from the MOBs, mowing, and periodic cleaning of the discharge pipes from the vertical flow cells. 

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