ACIDIC COMPONENTS OF THE NATURAL AND WAST E ACIDIC WATERS - THE MODELING OF THE PROCESS OF ACIDIC WATER NEUTRALIZATION BY UNDERGROUND WATERS

A comparison of acidity when the acidic waters are neutralised by calc ite with those of underground waters indicates that the highest acidit y is formed in the closed system by the action of calcite. It is cause d the high Delta H+ transition value of CO2 --> HCO3- at high CO2 cont ent in: S-carb = [CO2] + S-HCO-3+S-CO32-. At the mixing of acidic wate rs with underground waters the highest acidity is characteristic of th e open system and is affected by Fe2+ oxidation. The neutralisation of acidic waters by underground waters is accompanied by the precipitati on of Al(OH)(3), Fe(OH)(3), MnO2, siderite,malachite resulting in minu te decrease of filtration properties of host rocks. Pore colmatage. wa s found to be extremely lower in relation to the case of calcite neutr alisation as gypsum is not precipitated and water itself is subjected to high dilution. Buffering capacity of the natural waters in respect of the acidic loading is found to indicate distinct latitudinal zoning . It is minimal in the Northern humid regions and maximal in those of arid climate.