مشخصات پژوهش

Polycyclic aromatic hydrocarbons (PAHs) are known as ubiquitously present environmental pollutant. More than one hundred PAHs exist in the environment and often occur as complex mixtures. Due to ability to affect the endocrine systems of humans and animals, also toxic and carcinogenic effects of some PAH compounds, they are included among the priority pollutants announced by the U.S. Environmental Protection Agency and priority substances to the water farm work DIRECTIVE 2013/39/EU. Effluents of waste water treatment plants convey compounds of PAHs in the sea so, loss of species in aquatic environment and developmental delays and deformities in amphibians is inevitable. In this study, solid phase micro extraction (SPME) was effectively performed for extraction PAH compounds from real samples gathered from effluent of a waste water treatment plant (WWTP) with input of both municipal and industrial waste water. Row sewage was exposed to physical, chemical and biological processes in the WWTP. Under optimum extraction condition, GC-MS used for investigate target analytes. Pilot photocatalytic reactor was designed to improve the treating system. Treated waste water was passed over glass surface covered by titanium dioxide (TiO2) under UV light. Two important aim were followed in this method. First of all, the series of experiments were designed by changing effective factors. During treating time several samples were analysed to determine the purification process and choosing the optimum destruction condition. Next step was performed to identification of new degradation products. In environmental researches it should be considered to use methods in accordance with green chemistry as performed in this research. The results of this study provide new insight into the advantages and disadvantages of using photocatalytic process and UV light as reinforce treatment systems in destruction of PAHs.