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.

Basic principle of deacidification

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

Competence in water deacidification

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.

ABIONIK offers different types of plants depending on the field of application and customer requirements

  • Flat bed aerator
  • Trickler

In flatbed aerators, air is sucked in through microfilters and blown into the water to be treated through ceramic candles. The fine-bubble air intake increases the exchange surface between air and water extremely, so that an intensive mass transfer is guaranteed. Due to the energy input of the air, the CO2 dissolves well from the water and is transported away with the air flow. This leads to an increase in the pH value. This process enables a high deacidification performance with low energy consumption.

In strip and desorption plants, the water to be deacidified is trickled through a central nozzle or a perforated distributor plate in the upper part of the column onto mineral packing. The packing serves to increase the mass transfer surface. Air is blown in in a countercurrent process, which leads to outgassing of the dissolved carbon dioxide. The treated water is collected at the bottom of the column and discharged for further use.

Fields of application

ABIONIK offers you established and economical methods for the treatment of drinking and process water, which are used worldwide in various industries, including

  • Drinking water treatment: public water supply or private well water supply
  • deacidification/degassing: power plants, heating systems, steam boilers
  • Cooling water treatment

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