Drinking-water treatment

Drinking-water treatment

“Drinking water is the most important means of sustenance, it cannot be replaced by other substances.” DIN 2000 Central Drinking-Water Supply

In water-treatment facilities, raw water is purified into drinking water. The method is illustrated below in its typical sequence.


The first step for the treatment of raw water is its aeration. The raw water is enriched with oxygen in an aerating system (also: air gassing system) before it is passed on to the subsequent treatment steps. Likusta offers two proven system types for aeration:

  • Flatbed aerators

  • Desorption systems

Air is pumped into a flatbed aerator and blown into the raw water through the porous cylinders of the air vents. CO₂ dissolves in the water through the bubbling air and escapes. The adjustment of the local lime-carbonic acid equilibrium contributes significantly to the protection of systems and infrastructure.

Deacidification for drinking water treatment can also be carried out with the help of desorption systems. In this process, the raw water in the upper part of the column is trickled onto filling bodies. The filling body assembly serves to enlarge the material exchange surface. Counter-flow air is blown in, and the carbon dioxide is expelled.

Desorption system for drinking-water treatment
Desorption system for drinking-water treatment
Activated carbon filter with Likucarb activ Likusta
Activated carbon filter with Likucarb activ


Iron and manganese ions are precipitated as brown flakes by the preceding aeration (iron and manganese removal). These slurries are now retained in the filter systems. Likusta designs and manufactures the filter systems used for this purpose:

  • Sand or gravel filter systems

  • Activated carbon filter with Likucarb active

According to the “from coarse to fine” filter principle, the grey water first flows through gravel and quartz sand filters, which are filled with mineral material of ever-finer grain size. Thereby, suspended matter is removed. Ozone is used as the oxidising agent during ventilation.Near-surface groundwater may contain increased amounts of organic contaminants, which may require additional treatment.

Dissolved organic and inorganic substances are then adsorbed through an activated carbon filter so that unwanted colour, odour or flavouring substances are removed from the water. The activated carbon is charged with the unwanted water constituents and is replaced or regenerated at regular intervals. This is a service Likusta would be happy to assist you with. Our specially treated Likucarb active is water-regenerable, i.e. depending upon the application it can be regenerated and reused 5 to 10 times.

The sand or gravel filter system can be bundled with the activated carbon filters or an active carbon layer in a combined system.


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