Review on inorganic pollutants in stormwater runoff of non-metal roofs

Metal roofs have always been in the focus of stormwater runoff contamination. However, other roofing materials are also suspected releasing metals and inorganic substances with runoff. Hence, this review focuses on impact commonly used non-metal - vegetated non-vegetated quality. Results from 42 studies were compiled assessed to gain an overview nine types a special green roofs. Concentrations 27 including nutrients, heavy metals, compared. show that roof can be potential source for Threshold values groundwater protection exceeded especially PO 4 3- , Cu, Pb, Zn some materials. As concentrations vary strongly different parameters, no material identified as clearly superior or inferior others. Gravel act sink NH + retain metals. Elevated metal found wood shingle treated preservative chemicals most usually due gutter Green shows increased P tot Na, K, Ca, Mg. The depend age, growth substrate, applied fertilizers. In addition materials, external factors dependent location (rural urban site) influence Runoff analyzed must seen diffuse environmental pollution requires appropriate treatment before it is released into environment further applications. Overall, there only few topic so not possible make statistically significant statements. More serious in-depth urgently needed.