Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
J Environ Sci (China). 2018 Mar;65:327-334. doi: 10.1016/j.jes.2017.07.008. Epub 2017 Jul 18.
As an efficient method for ammonium (NH) removal, contact catalytic oxidation technology has drawn much attention recently, due to its good low temperature resistance and short start-up period. Two identical filters were employed to compare the process for ammonium removal during the start-up period for ammonium removal in groundwater (Filter-N) and surface water (Filter-S) treatment. Two types of source water (groundwater and surface water) were used as the feed waters for the filtration trials. Although the same initiating method was used, Filter-N exhibited much better ammonium removal performance than Filter-S. The differences in catalytic activity among these two filters were probed using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and compositional analysis. XRD results indicated that different manganese oxide species were formed in Filter-N and Filter-S. Furthermore, the Mn3p XPS spectra taken on the surface of the filter films revealed that the average manganese valence of the inactive manganese oxide film collected from Filter-S (FS-MnO) was higher than in the film collected from Filter-N (FN-MnO). Mn(IV) was identified as the predominant oxidation state in FS-MnO and Mn(III) was identified as the predominant oxidation state in FN-MnO. The results of compositional analyses suggested that polyaluminum ferric chloride (PAFC) used during the surface water treatment was an important factor in the mineralogy and reactivity of MnO. This study provides the theoretical basis for promoting the wide application of the technology and has great practical significance.
作为一种高效的去除氨氮（NH）的方法，接触催化氧化技术由于其良好的低温耐受性和短的启动期而受到了广泛关注。采用两个相同的过滤器来比较地下水（Filter-N）和地表水（Filter-S）处理中氨氮去除的启动期间的过程。使用两种类型的原水（地下水和地表水）作为过滤试验的进料水。尽管使用了相同的启动方法，但 Filter-N 表现出比 Filter-S 更好的氨氮去除性能。通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）、X 射线光电子能谱（XPS）和组成分析探究了这两个过滤器之间的催化活性差异。XRD 结果表明，在 Filter-N 和 Filter-S 中形成了不同的锰氧化物物种。此外，对过滤膜表面的 Mn3p XPS 光谱进行分析表明，从 Filter-S 收集的非活性锰氧化物膜（FS-MnO）的平均锰价态高于从 Filter-N 收集的膜（FN-MnO）。FS-MnO 中鉴定出主要的氧化态为 Mn(IV)，FN-MnO 中鉴定出主要的氧化态为 Mn(III)。组成分析结果表明，在地表水处理过程中使用的聚合氯化铝铁（PAFC）是 MnO 矿物学和反应性的一个重要因素。本研究为促进该技术的广泛应用提供了理论基础，具有重要的实际意义。
