Dipartimento di Ingegneria e Geologia, Università degli Studi "G.D'Annunzio", Via dei Vestini 30, 66013, Chieti, Italy.
Department of Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, 08028, Barcelona, Spain.
Sci Rep. 2022 Jun 3;12(1):9284. doi: 10.1038/s41598-022-13367-y.
Ionic exchange tests have been performed on superficial wastewaters to remove ammonia using a volcanic zeolitized rock from Lazio Region (Central Italy). The zeolitite (natural zeolite) is characterized by chabazite, phillipsite and minor amounts of sanidine, leucite and analcime. After preliminary column experiments in laboratory focused to determine the saturation time of the zeolitite, a pilot plant was built up on a little water course near the area of San Giustino channel (Abruzzo Region, Central Italy). Wastewaters, characterized by starting ammonia value ranging between 5 and 120 mg/l, were filtered with a zeolitic bed. The first experimental results indicate a positive ammonia reduction of about 80-90% and, in all cases, NH concentration values under the EU law limits. A main purpose of this paper is to evidence that most of studies published on uptake of ammonia by means of zeolitite lead with clinoptilolite-dominant zeolitite despite the large and best performance of phillipsite-chabazite zeolites (up to 61-79% improvement of ammonia uptake). Last but not least, a large number of published studies are of difficult comparison because of poor characterization of the zeolitite used.
已对浅层废水进行离子交换测试，以使用来自拉齐奥地区（意大利中部）的火山沸石岩去除氨。沸石（天然沸石）的特征是菱沸石、辉沸石和少量的正长石、白榴石和方沸石。在实验室中进行了初步的柱实验，以确定沸石的饱和时间后，在意大利中部圣朱斯蒂诺海峡（阿布鲁佐地区）附近的一条小河上建造了一个试验工厂。废水的起始氨值在 5 至 120mg/l 之间，用沸石床进行过滤。最初的实验结果表明氨的去除率约为 80-90%，并且在所有情况下，NH 浓度值均低于欧盟法律规定的限值。本文的主要目的是证明，尽管在氨的去除效果方面，以菱沸石为主的斜发沸石的性能最好（氨的去除率提高了 61-79%），但大多数关于沸石去除氨的研究都是使用最常见的沸石，尽管沸石的特征化较差，难以进行比较。
