As part of the remediation of this former munitions production site, contaminated soils were excavated and placed in a landfill. The leachate arising from the landfill is treated in a wetland system before discharge into the local surface water system. The design incorporated contingencies for any expansion of the landfill. Our plan included degrading leachable contaminants from a parallel soil washing pad before discharge into a nearby surface watercourse.
The integrated system adopted provides for a sustainable solution to deal with intermediate strength landfill leachates, where ammonia concentrations are below the average threshold for conventional treatment plants (<200 mg/l) but above that usually treated in reed beds (5 to 20 mg/l).