Djambazov S.Yoleva A.2024-07-162024-07-162024-07-162024-07-162018-01-011314-79781314-7471SCOPUS_ID:85055315962https://rlib.uctm.edu/handle/123456789/1232The aim of the present experimental investigation is to trace the change of some general characteristics (pH, electro conductivity, mineralization and chemical composition) of spring water from Rila mountain in Bulgaria, as well as of electrochemically activated water after different periods in contact with a natural zeolite from Haskovo region, Bulgaria. The chemical and phase compositions of the zeolite are determined by means of ICP-AES and XRD. The effect of the zeolite-water contact time of 24 h, 48 h, 72 h and 168 h on the ion exchange process in presence of 10 mass % natural zeolite concentration is followed. The experiments are carried out with two types of a zeolite - a non thermally treated zeolite at 25°C and a thermally treated one for 2 h at a maximal temperature of 300°C and 550°C. Electrochemically activated water of different PH values is obtained through electrolysis carried out for time intervals ranging from 5 min to 20 min. The treated waters of different PH values are used for 48 h treatment at 550°C. The chemical composition, the pH changes, the electro conductivity and the mineralization are determined using ICP-AES and Combo pH/Conductivity/TDS meter (Low Range, HANNA instruments HI98129 multiparameter, 14pH, 3999us/cm, 2000 ppm). The optimal conditions of the ion exchange process between the natural zeolite and the spring water are established. The extended ion exchange process and the higher heat treatment temperature of the zeolite result in a higher amount of transmitted K+and Na+c ations improving thus the ion exchange. It is proved that alkaline water has an activating action stimulating the ion exchange of both cations and anions in the water systems.enArticle