Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Chemosphere. 2020 Aug;253:126625. doi: 10.1016/j.chemosphere.2020.126625. Epub 2020 Mar 31.
In this study, the removal performance of a hybrid ozonation-coagulation (HOC) process using AlCl6HO (Al-HOC) and FeCl6HO (Fe-HOC) as coagulants for the treatment of wastewater treatment plant (WWTP) effluent and ibuprofen (IBP) was investigated. Compared with the conventional coagulation process and pre-ozonation-coagulation process, much better organic matter removal performance can be achieved for both the Al-HOC and Fe-HOC processes. The Fe-HOC process showed an obviously higher dissolved organic carbon (DOC) removal efficiency than that of the Al-HOC process. Surface hydroxyl groups were determined to be the active sites in generating OH in the HOC process, and the hydrolysed Fe species possessed a higher content of surface hydroxyl groups than the hydrolysed Al species according to fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectra (XPS) analyses. In addition, the hydrolysed Fe species contained a higher portion of tetrahedral sites that were more likely to be stronger Lewis acid sites to react with ozone to generate OH. Furthermore, peroxone reactions in the HOC process were other possible way to enhance the OH generation, and higher HO generation was observed in the Fe-HOC process due to higher O generation. Therefore, better removal performance of the Fe-HOC process can be obtained due to the increased OH generation in the Fe-HOC process.
在这项研究中，使用 AlCl6HO（Al-HOC）和 FeCl6HO（Fe-HOC）作为混凝剂的混合臭氧氧化-混凝（HOC）工艺用于处理废水处理厂（WWTP）出水和布洛芬（IBP）的去除性能进行了研究。与传统的混凝工艺和预臭氧化-混凝工艺相比，Al-HOC 和 Fe-HOC 工艺都能更好地去除有机物。Fe-HOC 工艺对溶解性有机碳（DOC）的去除效率明显高于 Al-HOC 工艺。根据傅里叶变换红外光谱（FT-IR）和 X 射线光电子能谱（XPS）分析，表面羟基被确定为 HOC 工艺中产生 OH 的活性位点，并且水解的 Fe 物种比水解的 Al 物种具有更高含量的表面羟基。此外，水解的 Fe 物种含有更多的四面体位，更有可能是更强的路易斯酸位，与臭氧反应生成 OH。此外，HOC 工艺中的过氧单烷反应是增强 OH 生成的另一种可能途径，由于生成了更多的 O，因此在 Fe-HOC 工艺中观察到更高的 HO 生成。因此，由于 Fe-HOC 工艺中 OH 生成增加，因此可以获得更好的 Fe-HOC 工艺去除性能。
