| Urban stormwater runoff, a source of varied pollutants, can negatively alter the water quality when discharged untreated into receiving waters. Stormwater best management practices (BMP) incorporate the use of structural and non-structural controls to achieve predetermined water quality goals. The Coanda-effect screen, a self-cleaning debris removal device requiring minimal supervision, can be effectively used as a BMP to eliminate gross pollutants and suspended solids. The screen's efficiency in removing nutrients from simulated stormwater was evaluated in a pilot-scale setup in Kingsville, TX. The screen was tested for its nutrient reduction capability at flowrates representative of small to medium sized storm runoff events in McAllen, TX. The reduction in nutrient and TSS concentrations at the outlet of the screen showed that it efficiently removed an average of 7.7% of TN, 14% of TP and 18% of TSS. The Wilcoxon's Signed Ranks test proved that these removal efficiency values were statistically significant. |
