Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, the Netherlands.
Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, the Netherlands.
Water Res. 2021 Jan 1;188:116472. doi: 10.1016/j.watres.2020.116472. Epub 2020 Sep 29.
Continuous development of industry and civilization has led to changes in composition, texture and toxicity of waste water due to the wide range of pollutants being present. Considering that the conventional wastewater treatment methods are insufficient for removing micropollutants and nutrients to a high level, other, alternative, treatment methods should be used to polish wastewater treatment plant effluents. In this study we developed an alternative, polishing concept for removal of ammonium and micropollutants that could potentially be incorporated in existing wastewater treatment plants. We demonstrated a method to use high silica MOR zeolite granules as an adsorbent for simultaneous removal of the micropollutant sulfamethoxazole (SMX) and ammonium (NH) ions from aqueous solutions. At an initial NH concentration of 10 mg/L the high silica zeolite mordenite (MOR) granules removed 0.42 mg/g of NH, similar to the removal obtained by commonly used natural zeolite Zeolita (0.44 mg/g). However, at higher NH concentrations the Zeolita performed better. In addition, the Langmuir isotherm model showed a higher maximum adsorption capacity of Zeolita (q, 4.08 mg/g), which was about two times higher than that of MOR (2.11). The adsorption capacity of MOR towards SMX, at both low (2 µg/L) and high (50 mg/L) initial concentrations, was high and even increased in the presence of NH ions. The used adsorbent could be regenerated with ozone and reused in consecutive adsorption-regeneration cycles with marginal decrease in the total adsorption capacity.
工业和文明的持续发展导致废水中污染物的种类、组成、结构和毒性发生了变化。由于存在广泛的污染物，传统的废水处理方法不足以将微量污染物和营养物质高水平去除，因此应使用其他替代处理方法来对废水处理厂出水进行深度处理。在这项研究中，我们开发了一种替代的深度处理概念，用于去除铵和微量污染物，该概念可能被纳入现有的废水处理厂。我们展示了一种方法，即使用高硅 MOR 沸石颗粒作为吸附剂，同时从水溶液中去除微量污染物磺胺甲恶唑 (SMX) 和铵 (NH) 离子。在初始 NH 浓度为 10mg/L 的情况下，高硅沸石丝光沸石 (MOR) 颗粒去除了 0.42mg/g 的 NH，与常用天然沸石 Zeolita(0.44mg/g) 的去除量相似。然而，在更高的 NH 浓度下，Zeolita 的表现更好。此外，Langmuir 等温线模型显示 Zeolita 的最大吸附容量更高(q,4.08mg/g)，是 MOR(2.11mg/g) 的两倍左右。MOR 对 SMX 的吸附容量在低浓度(2μg/L)和高浓度(50mg/L)初始浓度下均较高，并且在 NH 离子存在下甚至会增加。用过的吸附剂可以用臭氧再生，并在连续的吸附-再生循环中重复使用，总吸附容量略有下降。
