Abstract The objective of the study was to assess the health risk related to the presence of heavy metals in street dust samples collected from Canton Sarajevo (CS). Street dust samples (42) were grouped in three categories: high density traffic roads, medical centers/parking and parks. The mean concentrations for Cd, Cr, Cu, Fe, Mn, Ni, Pb, V and Zn determined by flame atomic absorption spectrometry (FAAS) were 1.71, 30.99, 74.85, 674.4, 221.9, 33.16, 41.46, 22.97 and 53.92 μg/g, respectively. According to correlation matrix analysis very strong positive correlation was found between Zn and Fe. The Hazard index (HI) values for non-carcinogenic substances for adults and children were 2.46E-1 and 1.31E + 00, respectively. There is a possibility of occurring of non-carcinogenic effects of street dust on children, as opposed to adults. Exposure pathway that most impact the non-carcinogenic and carcinogenic risk, for both, children and adults, is the ingestion followed by the dermal and inhalation route. The carcinogenic risk caused by Cd, Cr and Pb in the street dust could be considered negligible.

In this research an electrochemical technique in combination with powdered activated carbon (PAC) for the removal of micropollutants by adsorption as an advanced stage purification step from effluents of pilot plant wastewater treatment plants (WWTP). The effluents of sedimentation tank comprised of wastewater plus PAC (WWPAC). The pilot plant mainly consists of two parts; the first one consists of electrocoagulation (EC) reactor and the second consists of electrophoretic deposition (EPD) discs and electroflotation (EF) setup. The electrocoagulation (EC) reactor is a fiber box consisting of two chambers and thirty four plates of one material (either Fe or Al) on the whole in one EC reactor while one cell has seventeen plates. Both types of electrodes have been tested with the outflow of sedimentation tank. The outflow from the sedimentation tank has been entered into the EC reactor for the determination of EC reactor efficacy for the successful accomplishment of EC process at the designed pilot plant for WW treatment. The effect of different operational parameters; PAC dosage (20 mg), electrode nature (Fe and Al), current density (0.34–2.02 A/m2) has been studied to find out the optimum conditions. Sludge volume index (SVI) of the sludge, thermogravimetric (TG), differential thermal analyses (DTA) and particle size distribution (PSD) of the flocs generated after the EC process has also been studied. The turbidity, pH and conductivity of effluents before and after EC treatment has also been carried out. This pilot plant research gave promising results for future work in advance wastewater treatment direction.

22 In this research an electrochemical technique in combination with powdered activated carbon 23 (PAC) for the removal of micropollutants by adsorption as an advanced stage purification step 24 from effluents of pilot plant wastewater treatment plants (WWTP). The effluents of sedimentation 25 tank comprised of wastewater plus PAC (WWPAC). The pilot plant mainly consists of two parts; 26 the first one consists of electrocoagulation (EC) reactor and the second consists of electrophoretic 27 deposition (EPD) discs and electroflotation (EF) setup. The electrocoagulation (EC) reactor is a 28 fiber box consisting of two chambers and thirty four plates of one material (either Fe or Al) on the 29 whole in one EC reactor while one cell has seventeen plates. Both entered into the EC reactor for the determination of EC reactor efficacy for the successful 32 accomplishment of EC process at the designed pilot plant for WW treatment. The effect of 33 different operational parameters; PAC dosage (20 mg), electrode nature (Fe and Al), current 34 density (0.34–2.02 A/m 2 ) has been studied to find out the optimum conditions. Sludge volume 35 index (SVI) of the sludge, thermogravimetric (TG), differential thermal analyses (DTA) and 36 particle size distribution (PSD) of the flocs generated after the EC process has also been studied. 37 The turbidity, pH and conductivity of effluents before and after EC treatment has also been carried 38 out. This pilot plant research gave promising results for future work in advance wastewater 39 treatment direction. 40