Potable water water purification unit

Adjustment of the lime-carbonic acid balance to protect plants and infrastructure In addition to various dissolved minerals, natural water contains bound and free carbon dioxide. The lime-carbonic acid equilibrium of water refers to the chemical balance between the ions of calcium carbonate and carbonic acid. If a water contains less carbon dioxide, it is calcite separating, if it contains more, it is calcite dissolving. The creation or maintenance of the lime-carbonic acid equilibrium prevents the calcification of closed pipelines through precipitation of calcium carbonate (limestone) and, if the content of free associated carbonic acid is too low, prevents damage to metallic plant components or pipelines through an excess of aggressive free carbonic acid. The deacidification of drinking and process water is therefore of great importance. Deacidification is the reduction of the concentration of carbon dioxide dissolved in water by outgassing or reaction with basic substances. This leads to an increase of the pH-value in the water. In the Drinking Water Ordinance of 2011 the corresponding limit values are specified pH value between 6.5 and 9.5 calcite dissolving capacity less than 5 g/m³; this requirement is considered fulfilled from a pH value of 7.7 With our proven desorption plants, spring, well and surface water is deacidified according to the principle of lime-carbonic acid saturation. Carbon dioxide is dissolved out of the raw water and thereby transferred into the gas phase. The deacidification capacity can be adjusted to changing requirements by adjusting the amount of air blown in.