CO2 Water Treatment & pH Control Solutions
Safe, automated, and cost-effective pH control using CO2 — for desalination plants, drinking water treatment, wastewater neutralization, and industrial process water.
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Sicgil CO2 Dosing System
- Skid-mounted, compact and high-efficiency CO2 dosing system
- Construction: SS 316 — corrosion resistant and built for demanding environments
- Operating Pressure: 3.0 to 5.0 Kg/cm² (g) permeate water pressure
- 98-100% CO2 Absorption: Sparger + mechanical dosing combination ensures near-complete gas absorption
- Fully Automatic: Standalone PLC local control panel for automated CO2 dosing
- Auto-Purge: Non-condensable gases and air are automatically vented from the exit stream
- Turnkey Package: Complete installation and commissioning of CO2 storage and dosing system
How CO2 pH Control Works
Step 1 — Dissolve
CO2 gas is dissolved in water to form mild carbonic acid, gradually lowering pH.
Step 2 — Control
pH changes are nearly linear and self-buffering — pH won't drop below 6.0, eliminating risk of over-acidification.
Step 3 — Neutralize
Carbonic acid reacts to form benign carbonate salts that don't cause further problems with the effluent or increase TDS levels.
CO2 vs Mineral Acids
| Feature | CO2 | Mineral Acids (H2SO4/HCl) |
|---|---|---|
| Safety | Non-corrosive, safe to handle | Hazardous, corrosive |
| pH Control | Gradual, self-buffering | Sharp, risk of overshoot |
| TDS Impact | No increase | Increases TDS |
| Equipment | Standard piping | Acid-resistant required |
| Automation | Fully automated | Requires constant monitoring |
| Residue | Benign carbonate salts | Problematic salts |
| Storage | Standard pressurized tank | Acid-proof containment |
| Environmental | Eco-friendly | Hazardous waste disposal |
Applications
Desalination
Post-treatment remineralization — CO2 + limestone bed restores calcium, bicarbonate alkalinity, and stable pH to desalinated water before municipal distribution. Required as final stage after RO treatment.
Drinking Water Treatment
pH adjustment of treated drinking water. CO2 provides safe, precise control without risk of over-acidification. Self-buffering ensures pH stays within compliance range.
Wastewater & Effluent
pH neutralization of alkaline industrial effluent. Unlike mineral acids, CO2 doesn't increase TDS levels — a critical benefit for treated water quality and environmental compliance.
Industrial Process Water
Cooling towers, pulp & paper mills, mining operations, textile processing, and swimming pools — precise, safe pH control without corrosive chemicals or special equipment.
System Specifications
| Parameter | Specification |
|---|---|
| Construction Material | SS 316 |
| Operating Pressure | 3.0 to 5.0 Kg/cm² (g) |
| CO2 Absorption Rate | 98-100% |
| Dosing Method | Sparger + Mechanical |
| Control System | Standalone PLC |
| Non-condensable Gas Handling | Auto-purge via vent valve |
| Installation | Turnkey (storage + dosing) |
| Monitoring | pH analyzers for real-time process control |
Key Benefits
- Non-corrosive to pipes and equipment
- No special handling or acid-proof equipment required
- Self-buffering prevents over-acidification
- No increase in TDS levels
- Fully automated operation reduces labour costs
- Safer than sulfuric or hydrochloric acid
- Forms benign carbonate salts — no hazardous waste
- Complete turnkey solution with installation and commissioning