Coal Combustion Residual Landfill Wetland Leachate Treatment System

The Springdale Power Station project represents a tailored collaboration between the Electric Power Research Institute and Allegheny Power Supply to develop a full scale treatment system for coal combustion residual landfill leachate in Allegheny County, PA.  This passive wetland treatment system serves as a source of many of the current passive design criteria.  The system is cost-effective and requires minimal operation and maintenance.    

Greenhouse Phytoremediation Research Facility

The system collects and pumps leachate to an oxidation/precipitation basin for iron removal prior to entering eight treatment cells.  The first four cells are aerobic wetlands to remove residual iron, followed by two manganese-oxidizing beds (MOBs), a vertical flow anaerobic organic cell for trace element removal, and an algal polishing pons.

Vertical Flow Anaerobic Cell 

Research features included greenhouse and outdoor test cells to evaluate trace metals uptake by plants.  Maintenance involves only infrequent cleaning of iron sludge from the oxidation/precipitation basin and mowing of the cell perimeters.

The project was the winner of the 1996 EPRI Innovator of the Year Award, 1996 PA Water Environment’s Industrial Excellence Award and the 1997 Pennsylvania Governor’s Award for Environmental Excellence.  

Project Summary:
Construction Cost – $1,170,000
Annual O&M Cost – $10,000
10-year Treatment Cost – $.024/gal
Design Flow – 100 GPM

Compliance Parameter Results:

pH – 7.66 SU
Aluminum – 0.030 mg/L
Arsenic – 0.0048 mg/ L
Iron – 0.094 mg/ L
Manganese – 0.050 mg/ L
Selenium – 0.0015 mg/ L
TSS – 1.8 mg/L

System Schematic Wetland Leachate Treatment System: