| Summary: | 碩士 === 國立中山大學 === 環境工程研究所 === 107 === Urban rivers located in the industrially dense and the center of Kaohsiung City, where pollution sources mainly include domestic wastewater, metal processing wastewater and feedlot wastewater. In this study analyzed water quality and the concentrations of heavy metals、polycyclic aromatic hydrocarbons (PAHs) and phthalate esters (PAEs) in sediments collected from urban rivers. The decreasing trend of heavy metals were observed in sediments as Zn>Cr>Cu>Ni>Pb>As>Hg>Cd, Zn>Cr>Cu> Ni>Pb>As>Hg>Cd and Zn>Cu>Cr>Pb>Ni>As>Hg>Cd in the Fengshan river, Agongdian river and Dian Bao River. Sediment quality indicators, such as enrichment factor (EF) and geo-accumulation index (Igeo) were used, in addition to risk assessment; mean-ERM-quotiet (m-ERM-q) and ecological risk index (PERI) showed that had more than 30% potential ecological risk for all heavy metals, suggesting that Zn and Hg are mostly derived from anthropogenic sources in sediments of urban rivers in Kaohsiung city. Concentrations of PAHs in sediment seasonally ranged from 65.8 ng/g to 421.0 ng/g. Biomass combustion and petrogenic combustion were identified to be the main sources of PAHs in the Fengshan river. The average concentration of PAEs below the lower limit for the sediment quality indicator of category management and use restrictions in the Fengshan river.
|
|---|
