A half-saturated pilot-scale wetland planted with Acorus calamus was built to treat urban stormwater. The design comprises a sedimentation tank for pretreatment, and a vertical flow volcanic gravel wetland bed equipped with a recirculation device. Eighteen rainfall events were monitored in 2012. The treatment system achieved total removal efficiencies of 99.4, 81, 50, and 86% for suspended solids, organic matter, nitrogen and phosphorus, respectively, and 29, 68, and 25% for copper, zinc, and lead, respectively, at a 3-day hydraulic residence time. In the wetland bed, the removal of ammonia, total nitrogen, and zinc were improved by recirculation. Plant uptake provided 18% of nitrogen removal and 39% of phosphorus removal. During the experimental stage, only 1.4% of the pore volume in substrate was reduced due to clogging, implying that the wetland can operate without clogging for a relatively long period.
Performance of a half-saturated vertical flow wetland packed with volcanic gravel in stormwater treatment
Yaoping Chen, Kisoo Park, Siping Niu, Youngchul Kim; Performance of a half-saturated vertical flow wetland packed with volcanic gravel in stormwater treatment. Water Sci Technol 1 June 2014; 69 (11): 2331–2338. doi: https://doi.org/10.2166/wst.2014.154
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