目前奈米材料已被廣泛的添加於民生用品或工業產品之中，隨著奈米科技應用的發展，造成有大量的奈米物質可能於使用後被排放至廢水處理廠中進而進入到環境之中，急需了解奈米汙染物於環境中的濃度以進行奈米顆粒的環境風險評估。本研究中以單顆粒式感應耦合電漿質譜儀調查了7種較常使用的奈米顆粒如Ce、Cu、Pb、Al、Zn、Ti和Ag於台灣南部兩種不同廢水處理程序的廢水處理廠中的去除及趨勢，然而本研究發現以過濾、低速離心和過篩的方式進行前處理會造成樣品中奈米顆粒的損失，在兩個廢水廠中的進流水濃度可發現Al > Zn > Ti > Ce > Cu > Pb > Ag，此結果與全球奈米顆粒的產量趨勢相同，其中粒徑最大為Ti 180-200 nm(以TiO2表示)，而粒徑最小為Ag 18-28 nm，另外於兩個不同廢水處理廠中可發現以生物處理之方式奈米顆粒的總去除率可高達95% 以上，以初級處理方式的去除效率則略低，為60-95%。

Nanomaterials have been incorporated into a wide range of consumer and industrial products. With nanotechnology-based applications increasing rapidly, a large amount of nanomaterials is being discharged into the waste treatment systems before releasing into the receiving waters. To enable the environmental risk assessment of nanoscale pollutants, the information regarding the concentrations of nanoparticles across environmental compartments is urgently needed. In this work, we aimed to characterize 7 common nanoparticles (NPs) relevant to consumer usages including Ce, Cu, Pb, Al, Zn, Ti, and Ag in domestic sewages and to compare their removal across the treatment processes of two municipal wastewater treatment plants (WWTPs) using distinct processes in southern Taiwan using single-particle inductively coupled plasma-mass spectrometry (spICP-MS). The sample pretreatment studies using filtration, low-speed centrifugation, and screening of wastewater samples resulted in significant losses of NPs. The concentrations of the selected NPs measured in raw sewages followed the order of Al > Zn > Ti > Ce > Cu > Pb > Ag and the trend correlated with NPs’ global production volumes. Ti as TiO2 was found to have the largest mean size at 180-200 nm and the smallest NP was Ag of 18-28 nm. The total NP removal was greater at >95% in the secondary biological treatment plant, while the primary treatment plant exhibited a smaller NP removal of 60-95%.

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