Deacidification systems

Deacidification systems

Adjustment of lime-carbonic acid equilibrium to protect systems and infrastructure

Natural water contains, in addition to various dissolved minerals, 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 water contains less carbon dioxide, it is lime separating; if it contains more, it is lime soluble.

The production or maintenance of the lime-carbonic acid equilibrium prevents:

  • Calcification of closed pipelines by the precipitation of calcium carbonate (limestone) with an insufficient content of free associated carbonic acid
  • Damage to metallic equipment components or pipelines by an excess of aggressive free carbonic acid

The deacidification of drinking and industrial water is thus of great importance.

Deacidification system
Deacidification system in waterworks
Deacidification system in waterworks

Basic principle of deacidification

Deacidification is the reduction of the concentration of the carbon dioxide dissolved in water by outgassing or reaction with basic substances. It leads to an increase in the pH value in the water. In the Drinking Water Ordinance of 2011, the respective limit values are specified as

  • pH between 6.5 and 9.5
  • Lime solubility capacity less than 5 g/m³; this requirement is met starting with a pH of 7.7

Likusta expertise in water deacidification

With our proven desorption systems, spring, well and surface water is deacidified and filtered according to the principle of lime-carbonic acid saturation. Carbon dioxide is extracted from the raw water and transferred into the gas phase. The deacidification performance can be adjusted by adapting the quantity of blown gas to changing requirements.

Likusta offers various types of systems depending on the application area and customer requirements

  • Flatbed aerator
  • Trickler 

In flatbed aerators, air is sucked in via microfilters and blown into the treated water by means of ceramic candles. The lightly blown air intake increases the exchange area between air and water extremely for intensive exchange of material, so that the carbonic acid present in the water connects with the oxygen in the air and escapes with it. This leads to an increase in the pH value. This process allows for high deacidification performance with low energy requirements.

In stripping and desorption systems, the water to be deacidified is trickled onto mineral fillers by means of a central nozzle or a perforated distributor plate in the upper part of the column. The filling element assembly serves to enlarge the material exchange surface here. In the counter-flow process air is blown in, which leads to the outgassing of the dissolved pollutants. The treated water is collected and diverted for further use in the column foot.

Flatbed aerator for deacidification of water
Flatbed aerator for deacidification of water
Deacidification bubbles
Deacidification bubbles

Application areas

Likusta offers you established and economical processes 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 plants, steam boilers
  • Cooling-water treatment


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