GAS APPLICATION

The natural water component CO₂ is an indispensable auxiliary in the targeted hardening of drinking water. The most economical method for increasing water hardness is the use of lime milk or lime water with equilibrium amounts of CO₂.

Ca(OH)₂ + 2 CO₂ ⇔ Ca²⁺ + 2 HCO₃^-

The injection of lime milk and CO₂ must be designed in a way that overdosing is avoided in order to prevent precipitation of limestone.

In smaller waterworks the adjustment of hardness is often achieved by filtration over a marble filters.

 CaCO₃(s) + CO₂ + H₂O ⇔ Ca²⁺ + 2 HCO₃^-

The CO₂ required for hardening is added prior to filtration.

Benefits:

• No corrosion
• Low operating costs
• No scale formation

MESSER SOLUTION

For the rapid and complete dissolution of CO₂, Messer supplies several widely tested technologies, varying from fine-bubble feed directly into the main water stream to complete dissolution in a side stream under hydraulically defined conditions. In a project we specify the feed method that fits the customer needs regarding local conditions best. If required Messer calculates the CO₂-dosage as well.