On the suitability of phillipsite-chabazite zeolitite rock for ammonia uptake in water: a case study from the Pescara River (Italy)

Abstract

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, NH4+ 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.

Właściwości i zastosowanie gruzińskiego naturalnego filipsytu

“…Phillipsite belongs to the PHI type (crystal chemical data |K2 (Ca, Na2)2 (H2O)12| [Al6Si10O32]-PHI, [4] and is structurally built up by layers of four-and eight-member rings forming double crankshaft chains, the framework contains three The field of application of phillipsite is not as wide as that of clinoptilolite, but phillipsite was used for ammonia adsorption [5], in removal of heavy metals [6] and other contaminants [7,8] from waste waters, and interest in faujasite-phillipsite and phillipsitechabazite rocks has recently increased [9,10].…”

Use of Zeolite (Chabazite) Supplemented with Effective Microorganisms for Wastewater Mitigation of a Marine Fish Farm

“…Zeolite has been used as an ion exchanger to absorb ammonium [14]. It was extensively tested in agriculture [15][16][17][18], freshwater basins [19], sewage effluent treatment for the reduction of ammonia and heavy metals [20][21][22][23], and more recently in the breeding of seabass juveniles [24]. In a seawater experiment, Lopez-Ruiz and Goméz-Garrudo [25] showed that more zeolite must be used to achieve the same amount of ammonium subtraction as obtained in freshwater experiences.…”