Hatfield Power Station Landfill

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

The Hatfield facility is a compliance passive treatment system for coal combustion residual landfill leachate showing elevated metals at circumneutral pH.  It was one of the first large-scale applications of manganese-oxidizing beds (MOBs) in the utility industry.  Discharges from two disposal areas are combined and pumped to a passive aerator and discharged to an oxidation/precipitation basin for iron removal.  The flow is then split by a double weir outlet and passes through two banks of two wetland cells operating in parallel for removal of residual iron and aluminum.  Final discharge occurs through a series of MOBs for manganese removal.  This design required steep slope planning and included auxiliary cell construction in an adjacent ephemeral channel.  The system has shown exceptional treatment performance since construction, achieving a 99.7% reduction in manganese on average.  Maintenance involves only an annual clearing of standing vegetation from the MOBs and routine mowing of the cell perimeters.

Owner: FirstEnergy Corp.
Facility: Hatfield’s Ferry Power Station
Location: Green County, PA
Year Constructed: 2000
Construction Cost:1 $2,670,000
Annual O&M Cost: $15,000
10-yr Treatment Cost:2 $0.047/gal
Design Flow: 114 GPM

Compliance Parameter Results 3:

pH 7.90 SU
Aluminum 0.048 mg/L
Arsenic 0.0086 mg/L
Iron 0.088 mg/L
Manganese 0.045 mg/L
Thallium 0.0036 mg/L
TSS 3.4 mg/L

1 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.

Hatfield CCR Landfill Constructed Wetland Leachate Treatment System