Harrison Power Station Landfill

Acknowledgement: A Water’s Edge Hydrology project by Terry Rightnour, ARM’s Senior Hydrologist

The Harrison project is one of the largest passive treatment system yet constructed for coal combustion residual   landfill 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.  The treatment approach is to remove 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 removes selenium and hexavalent chromium in a reducing environment.  Two more wetland cells and a pair of manganese-oxidizing beds (MOBs) complete the system.  Beginning in 2006, increasing amounts of mine drainage have been added to the influent to test the ultimate treatment capacity of the system, which has readily maintained compliance with the increased pollutant loading.  Maintenance involves only an annual clearing of standing vegetation from the MOBs, mowing, and periodic cleaning of the discharge pipes from the vertical flow cells.

Owner: FirstEnergy Corp.
Facility: Harrison Power Station
Location: Harrison County, WV
Year Constructed: 2003
Construction Cost:1 $3,740,000
Annual O&M Cost: $15,000
10-yr Treatment Cost:2 $0.025/gal
Design Flow: 300 GPM


Compliance Parameter Results:

pH 7.63 SU
Aluminum 0.051 mg/L
Arsenic 0.0011 mg/L
Iron 0.0043 mg/L
Selenium 0.318 mg/L
Manganese 0.829 mg/L
TSS 3.2 mg/L

1 Construction cost in 2012 dollars,
2 Construction cost + 10 x $15,000 annual O&M divided by 10 year design flow.
3 Average effluent value for system life.


Harrison CCR Landfill Constructed Wetland Leachate Treatment System