Application in Water Treatment! What Are the Effects of Calcium Oxide and Calcium Hydroxide, and What Should Be Noted?

Effects of Calcium Oxide in Water Treatment
Disinfection & Sterilization – Calcium oxide (quicklime) reacts violently with water, generating calcium hydroxide and releasing significant heat. The resulting high temperature and strong alkaline environment effectively kill bacteria, viruses, and parasites.

Phosphorus Removal – It reacts with phosphate ions to form calcium phosphate precipitates, helping prevent eutrophication in water bodies.

pH Adjustment – Quickly raises water pH, making it ideal for neutralizing acidic wastewater (e.g., electroplating, textile dyeing effluents).

Heavy Metal Removal – Helps precipitate certain heavy metals during acid neutralization.

Precautions for Calcium Oxide
Exothermic Reaction – Generates intense heat, posing safety risks if mishandled. Overdosing may cause localized excessive alkalinity, disrupting subsequent treatment.

Storage Sensitivity – Absorbs moisture and CO₂ from air, requiring airtight storage and careful handling.

Effects of Calcium Hydroxide in Water Treatment
Stable pH Increase – Dissolves gradually, providing a steady release of hydroxide ions for balanced pH adjustment without sudden spikes.

Heavy Metal Precipitation – Forms insoluble hydroxides with metals like lead, mercury, and cadmium, aiding their removal.

Applications – Used in drinking water purification, municipal wastewater polishing, and industrial wastewater where pH stability is critical.

Precautions for Calcium Hydroxide
Low Solubility – Large doses may be needed for high-volume or high-pH adjustments, increasing operational costs.

Pipe Scaling – Concentrated solutions can deposit calcium carbonate in pipes, requiring regular maintenance to prevent clogging.

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