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remineralization

Remineralization of drinking water: Sodimate solutions 

Following advanced treatment processes such as reverse osmosis or nanofiltration, the resulting water is extremely pure—but also aggressive. It contains very few minerals, which can lead to pipeline corrosion, pH instability, and deterioration in the quality of the distributed water.

Remineralization allows for the reintroduction of essential mineral elements into the water, particularly calcium, to stabilize the water, correct its pH, and ensure its long-term potability.

Standards and regulations concerning remineralization vary by country and depend on the authorities responsible for drinking water quality. These regulations often set limits on added mineral concentrations and require strict quality control procedures.

Understanding the remineralization process

Main objectives:

  • pH correction: Osmosed water is often acidic (pH < 7). Remineralization adjusts it toward a neutral or slightly alkaline level (pH 7.5–8).
  • Increase in hardness (TH): To avoid excessively soft and corrosive water.
  • Water stabilization: To prevent corrosion or scaling phenomena in distribution networks.

Sodimate equipment at the core of the treatment chain

Sodimate offers robust, fully integrated technical solutions tailored to the needs of drinking water production facilities.

  • Reagent storage
    Silo or big bag station for hydrated lime or calcium carbonate.
  • Extraction and dosing
    Using Sodimate’s shaftless screw feeders, which prevent clogging and ensure accurate, continuous dosing.
  • Preparation of lime milk
    Production of a homogeneous and stable lime slurry in an agitated preparation tank, with concentration control and suspension maintenance.
  • Injection into the process
    Pumped into an osmosis water pipeline or a contact basin.
  • Online monitoring
    pH, hardness, and alkalinity sensors for real-time dosage adjustment.

Main products and processes used in water remineralization

Objective

Recommended Product

Notes

Calcium + bicarbonate supply

CaCO₃ + CO₂

Natural, stable method

pH correction

Ca(OH)₂, NaHCO₃

Risk of overdosing must be monitored

Magnesium addition

MgCl₂ or dolomite

To be considered as needed, depending on targets

Hardness adjustment

CaCl₂, dolomite

Dosage must be adapted to the specific requirement

The proposed solutions offer numerous advantages. Their compact and modular design facilitates integration into constrained environments while ensuring high flexibility in layout.

The equipment is recognized for its robustness and reliability, with proven performance in the field of drinking water treatment. The dosing systems ensure optimal accuracy—even during continuous operation—guaranteeing consistent reagent supply and process stability.

User-friendly and requiring minimal maintenance, the systems offer significant operational benefits for plant operators. 

Sodimate provides comprehensive support throughout every project stage: customized studies, on-site installation, commissioning, and operator training—for safe and controlled system operation.

Sodimate equipment is already in use at numerous drinking water plants, particularly downstream of reverse osmosis units. Our expertise is widely acknowledged for process stability, equipment quality, and in-depth knowledge of mineral reagents.

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