Fate, behaviour, and implications of ZnO nanoparticles in a simulated wastewater treatment plant
Fate, behaviour, and implications of ZnO nanoparticles in a simulated wastewater treatment plant
复制标题
DOI：
10.4314/wsa.v42i1.09
复制
发表时间：
2016-01-01
期刊：
影响因子：
1.5
通讯作者：
Musee, N
中科院分区：
文献类型：
--
作者：
Chaúque, EFC;Zvimba, JN;Musee, N
工程纳米颗粒（ENPs）的使用增加，导致它们进入城市污水处理厂（WWTPs）作为它们的最终水槽。然而，ENPs对活性污泥污水处理厂细菌活性的不利影响尚不清楚，尽管它们在这些系统中的释放量增加。在本研究中，使用按照经济合作与发展组织（OECD 303A）规定的规范开发的模拟污水处理厂，研究了氧化锌ENPs处理对污水处理量的影响。使用电感耦合等离子体光学发射光谱法（ICP-OES）对设置的各个阶段（主要是原始废水和处理过的废水）的锌浓度进行了分析。所获得的结果表明，与污泥中锌的相对高浓度（约3 000 mg/kg）相比，处理过的废水中的锌残留量较低（约50-200 μ g/L）。本文报道的结果表明，ZnO ENPs在废水处理过程中沉淀，因此其在污泥中的含量很高。采用x射线衍射光谱法（XRD）测定了污泥中固体锌的存在。总体而言，在处理过程中，ZnO ENPs对模拟污水处理厂的化学需氧量（COD）去除水平没有显著影响
Increased use of engineered nanoparticles (ENPs) has resulted in their entry into municipal wastewater treatment plants (WWTPs) as their final sinks. However, the adverse impact of ENPs on the bacterial activity in the activated sludge WWTPs is not yet well understood, despite their increased release into such systems. In this study, the impacts on WWTPS associated with the disposal of zinc oxide (ZnO) ENPs was investigated using a simulated WWTP developed as per the prescribed Organization for Economic Co-operation and Development (OECD 303A) specifications. Analyses were done to determine zinc concentrations at various stages of the setup, mainly in the raw wastewater and treated effluent, using inductively coupled plasma optical emission spectrometry (ICP-OES). The results obtained indicated low levels of zinc residue (about 50-200 mu g/L) in the treated effluent compared to relatively high concentrations of Zn in the sludge (about 3 000 mg/kg). Results reported herein imply precipitation of ZnO ENPs during wastewater treatment processes and hence its high levels in the sludge. The presence of solid Zn in the sludge was determined using X-ray diffraction spectroscopy (XRD). Overall, no significant impact of ZnO ENPs on the performance of the simulated WWTP was observed, in terms of the removal levels of chemical oxygen demand (COD) during the treatment process