Constructed wetland, vertical-flow constructed wetland system (low P)

Constructed Wetland

Created at: 05 Sep 2015

Description

The fully automated loading cycle results in alternating wet and dry periods. During the initial two years of operation, the phosphorus removal for combined sewer overflows has been consistently high (94–99% of inflow concentrations). When loaded with lake water, the phosphorus removal has been high during summer (71–97%) and lower during winter (53–75%) partly because of lower inlet concentrations. Effluent phosphorus concentrations are consistently low (0.03–0.04 mg/L). Ammonium nitrogen is nitrified in the constructed wetland, and total suspended solids and COD are generally reduced to concentrations below 5 mg/L and 25 mg/L, respectively. The study documents that a subsurface flow constructed wetland system can be designed and operated to effectively remove phosphorus and other pollutants from combined sewer overflows and eutrophicated lake water.

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