Safety and Environment . Phase Hydrocarbons Overview A pilot scale constructed wetland is being tested as an innovative solution for surface treatment of dissolved phase hydrocarbons in extracted groundwater. During winter, subsurface aeration prevents freeze-up and enhances hydrocarbon removal. Advantages Lower maintenance associated with wetlands may result in long term cost savings. Wetlands also provide a more aesthetically pleasing, environmentally friendly treatment approach.
Limitations Constructed wetlands require more space than mechanical treatment.
Wetlands are best suited to the treatment of volatile, biodegradable hydrocarbons. During lower temperatures in Spring and late Fall, without aeration, hydrocarbons are not completely removed in the wetland, but are subsequently removed along the outflow channel. Overall, the constructed wetland appears to be a promising remedial alternative.