In urban environment stormwater pollution due to the wash-off of impervious surfaces during rainfall-runoff events requires urgent solutions. The removal of toxic metals from wastewater is a matter of great interest in the field of water pollution, which is a serious cause of environmental degradation. Besides the classical wastewater treatments, biosorption of heavy metals is an alternative technique, primarily because it utilizes inactive/dead biological materials as sorbents which are generally available at low cost, non-hazardous and abound in nature. The aim of this study is to show the potential use of the olive stones as filtration system for stormwater. The goal of this work is to evaluate the usefulness of olive stone waste separated from pulp generated in the oil production industry (from Italy) as a filtration media for stormwater pollutant treatment for the removal of selected heavy metals from binary mixtures aqueous solution. Olive is one of the most word-widely cultivated crops. Olive cultivation is particularly spread in the Mediterranean region where it represents an important sector for local tradition and rural economy. In the world production of olives the European Union (EU) is definitely the leading producer and consumer, mainly due to the influence of Spain and Italy. In the literature, several studies have been conducted on the removal efficiency of olive stones of heavy metals, hydrocarbons and organic substance. The main target of this study is to investigate the removal efficiency of the olive stone under mechanical filtration. Several laboratory tests have been carried on minimizing the contact time and keeping the natural pH of the solution. The Imhoff Cone has been used to maintain a constant volume of olive stone and allow the test filtration with binary aqueous solution. Input solution contained known concentrations of Fe, Pb, Cu, and Zn. Sample of inflow and outflow were analysed by using atomic absorption spectrophotometer to assess removal efficiency of the olive stone. The results show that olive stone remove Pb, Cu, and Fe from aqueous solutions but does not remove the other heavy metals investigated in this study (Zn).
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