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 Applications / Drinking water 

Basics

Drinking water treatment is the refinement of raw water from wells, river dam, lakes, groundwater or riverside filtrate using physical, chemical, or biological techniques. The drinking water ordinance decrees that the refinement must lead to water that is free of bacteria, colour and odour. it has to be cool and appetising with an agreeable taste and only a very low content of dissolved substances. it must not lead to corrosion of the piping system ([]) and should be provided in suffcent quantities and with sufficient pressure.

 

Depending on the quality of the raw water, several treatment steps are necessary to achieve this goal. The following drawing shows a treatment of riverside filtrate.

The process includes filtration, oxidation (with removal of iron and manganese), decarbonisation, softening, sedimentation and possibly disinfection.

Oxidation with Ozone

After biological/mechanical treatment the water might still contain various hazardous substances such as herbizides or drug residues, but also dissolved iron or manganese and other substances collected during the underground passage. Most are harmless or might even vital in low quantities, but in higher concentrations they can be toxic and might accumulate in pipes, making an oxidative removal compulsory. Ozone can be used at various stages of the treatment process.

Here you will find further information on Ozone treatment and Ozone measurement.

 

Decarbonisation

Decarbonisation reduces the concentration of dissolved carbon dioxide by physical or chemical methods, leading to a higher pH of the water. While the pH value has no ill effect on human health, it has a strong influence on maintaining the quality of drinking water in pipes and house installations. Acidic water may lead to corrosion of pipe materials and therefore to increasing concentrations of heavy metals in the drinking water, such as copper or zinc.  The delta-pH value is a measure for the aggressivity of water and is being used to control the physical decarbonisation treatment.

Read more about delta-pH and its measurement.

 

Disinfection

Disinfection of drinking water is a necessity if the raw water is not biologically acceptable, such as typically surface water or riverside filtrate. According to German drinking water ordinance drinking water must not contain any contagions that are dangerous for human health. A lot of effort goes into protecting, enhancing, and maintaining the hygienic microbiological safety of the water, covering everything from resources protection via treatment to distribution. Disinfection plays an important role in water treatment.

Read more about disinfection of drinking water

 

Softening

Although the German drinking water ordinance does not demand softening and even the recognized rules of engineering do not give a limit for hardness, in Germany there is an increasing tendency towards central softening of drinking water as a result of consumers ´requests.

The DVGW advises to test the possibilities of central softening according to worksheet W 235-1,if the hardness is higher than 3.5 mmol/l. Below a value of 2.0 mmol/l a central softening is usually not feasible. The softening treatment aims at hardness between 1.8 and 2.4 mmol/l, corresponding to hardness range medium. 

Here you will find further information about softening and the uses measuring procedure

Referenzkunden

Satisfied customers are the best reference. Next you will find a short list of companies' with whom we are working together in a mutually beneficial partnership:

  • Stadtwerke Trier, Herr Fischer
  • Stadtwerke Service Meerbusch Willich, Herr Oellers
  • Stadtwerke Mühlheim, Herr Petri
  • Stadtwerke Hofheim, Herr Mewes
  • Kreiswasserwerke Wegberg, Herr Zohren