PRELIMINARY STUDIES OF THE LABORATORY TREATMENT OF SOME UNDERGROUND WATERS

This paper presents preliminary studies on the removal of sulphide hydrogen, ammonium and organic compounds from groundwater through aeration, biodegradation and adsorption. Natural groundwater taken from a borehole located in the Lehliu Gara area, Calarasi county, was used. The raw water was introduced into an experimental laboratory installation, in three batches. The following parameters were monitored: pH, conductivity, sulphides and sulphide hydrogen, ammonium and total nitrogen, organic compounds, CCOMn, and dissolved oxygen. The experimental laboratory facility was operated for a period of 72 days, when a volume of 110,472 L was passed, during which 436.87 g of ammonium was removed from the 558.49 g entered into the system. From the total amount, 114 g of ammonium (20.4%) were removed by aeration and 436.9 g, i.e. 57.8% of ammonium, were removed by microbiological processes. To remove sulphide hydrogen and ammonium by aeration process, 63.47 m3 of air, 3 L of quartz sand and a mass of approximately 5 kg were used.