Green roofs (GRs) and vertical greenery systems (VGSs) can contribute certain pollutants to stormwater runoff, affecting the quality of the receiving waters. The objective of this review paper is to discuss the potential impact of these systems on the quality of urban runoff. In the green building systems section, a series of materials used in greenery systems and their specific application are presented and environmentally relevant substances that could be leached out from these materials are identified as potential pollutants. After the identification of environmentally relevant pollutants that have already been measured in urban runoff and originate from these systems, an assessment of their pathways, fate, and impact in the aquatic environment is performed. Since GRs and VGSs are already considered to be solutions for stormwater quantity and quality management in urban areas, recommendations for mitigating their environmental impact through runoff are needed. It can be concluded that special focus should be placed on measures that target the pollution source, such as optimizing GR and VGS construction practices and materials used, as well as establishing appropriate decentralized stormwater treatment measures. Both of these approaches will help to reduce or even entirely avoid the emission of relevant pollutants into the aquatic environment.

In this study, we valorize the use of Ensis siliqua shell powder (ESSP) as a biosorbent to remove Cu(II), Zn(II) and Ni(II) ion from aqueous solutions. A batch scale experiment for different mass doses of biosorbent in different concentrations of metalions was carried out. The sorption characteristic of the biosorbent was studied under various experimental conditions, such as pH, contact time, biosorbent amount on adsorption and concentration of the heavy metalions studied. The optimum pH for maximum uptake of copper, zinc and nickel was pH 4. Results indicate that the removal efficiency for copper, zinc and nickel was about 99.67 %, 99.20 % and 99.96 % respectively. The modeling kinetics of the three pollutants studied revealed that it conformed to a pseudo second-order model. Experimental results were applied to Freundlich, Langmuir, Dubinin-Radushkevich, Elovich and Temkin models. The adsorption model obeys the first version of Langmuir’s and Freundlich’s equation. This eco-friendly and low cost biosorbent successfully and favorably removed heavy metalions from synthetic wastewater solution and could be used to treat real industrial wastewater.