Overview
The CG Chlorine Dioxide Generator™ produces high-purity chlorine dioxide (ClO₂) on-site — one of the most powerful and versatile biocides for water and wastewater treatment. Unlike chlorine and sodium hypochlorite which lose efficacy at higher pH and form carcinogenic trihalomethanes (THMs), ClO₂ remains effective across pH 4–10, forms no THMs or chloramines, and maintains disinfecting power at lower dosages. ClO₂ also exhibits superior penetration and destruction of biofilm — critical for cooling towers, drinking water networks, and food-grade water where Legionella harbouring biofilm is a persistent problem. On-site generation eliminates storage and handling hazards associated with bulk chlorine.
Working Principle
ClO₂ is produced through a controlled reaction between sodium chlorite (NaClO₂) and a dilute acid activator (HCl or H₃PO₄) in a purpose-designed reactor vessel. Precision peristaltic pumps meter reagents in exactly controlled stoichiometric ratios. The ClO₂ gas generated is immediately absorbed into a water carrier stream, producing a ClO₂ solution (0.1–2.0 g/L) which is dosed into the target water stream. The system includes gas leak detection, automatic reagent shutoff, and ventilated generator cabinet. Dosing is controlled by flow-proportional metering or residual ClO₂ sensor feedback.
Key Technical Features
- On-site generation — no bulk ClO₂ storage hazard
- Effective across full pH range 4–10
- No THM or chloramine formation
- Superior biofilm destruction and prevention
- Controls bacteria, viruses, algae, iron, Mn, H₂S, and odour
- Output: 10–1,000 g ClO₂/hr (scalable)
- Purity: >95% ClO₂
- Flow-proportional or residual feedback control
- Gas leak detection with automatic safety shutdown
- PLC control with data logging
Design Parameters
| Parameter | Value |
|---|---|
| Output Range | 10–1,000 g ClO₂/hr |
| ClO₂ Purity | >95% |
| Effective pH | 4–10 |
| THM Formation | None |
| Reagents | NaClO₂ + HCl/H₃PO₄ |
| Control | Flow-prop / Residual FB |
| Solution Conc. | 0.1–2.0 g/L |
Applications
- Municipal drinking water disinfection
- Effluent final disinfection before discharge
- Cooling tower water — Legionella control
- Food and beverage process water
- Swimming pools and recreational water
- Hospital and healthcare water systems
- Pharmaceutical process water and CIP
- Irrigation water for food crop production
Advantages
- Effective across full pH range — no pH adjustment cost
- No THMs — meets most stringent drinking water standards
- Superior biofilm removal especially for Legionella
- Lower dosage than chlorine for equivalent disinfection
- No chlorine gas cylinder risk
- No chlorinated taste or odour at correct dosage
- Removes colour, iron, and manganese simultaneously
Frequently Asked Questions
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