Chemical treatment is the most common approach to water disinfection in municipalities as well as industry. Due to their simplicity and efficacy, the three most common chemicals used in the disinfection of water are chlorine, chlorine dioxide & ozone.
ClO2 provides residual disinfection throughout the process, it is less corrosive than Chlorine and is therefore approved by the EPA for drinking water disinfection. ClO2 is more versatile than chlorine because it has a broad-spectrum efficacy against bacteria, fungi, algae, viruses and protozoa.
Dosing ClO2 into process is more effective than chlorine dosing because it is far less corrosive on water systems, it is more effective at low levels, is not sensitive to system pH, it does not add taste or taint and unlike chlorine, does not form THMs (Trihalomethanes) which can be very harmful and even carcinogenic.
Chlorine dioxide (ClO2) is a powerful oxidising agent and biocide which is 100 – 1000 times more effective at removing and preventing biofilm than chlorine.
Chlorine Dioxide Generation Chemistries:
Enaqua’s ClO2 generation systems are based on 2 or 3 precursor chemicals, below are the two chemistry options:
2NaClO2 + 2HCl + NaOCl > 2ClO2 + 3NaCl + H2O
This chemistry is preferable for batch type systems due to the stability of the chlorine dioxide solutions produced.
5NaClO2 + 4HCl > 4ClO2 + 5NaCl + 2H2O
Preferable for inline systems due to the simplicity of controlling 2 precursor chemical pumps instead of 3.
System Configuration Options:
Chlorine dioxide generator capacity options are:
- 50g/hr, 100g/hr, 500g/hr, 1000g/hr, however customized requirements can be built to specification
- Batch or Inline type systems
- Integrated ClO2 residual analyser
- Remote log-in, data trending, control and alarming functionality
Chlorine dioxide benefits include:
- The disinfection of municipal and ground water sources
- It has approved residual levels in food & beverage processing
- ClO2 kills pathogenic microorganisms such as fungi, bacteria and viruses
- Inactivation of chlorine-resistant microorganisms such as Cryptosporidium as well as various Bacillus species
- Iron and manganese oxidation in municipal water distribution
- Removal of odour, colour and taste taint
Applicable markets for Chlorine dioxide (ClO2):
- Drinking water
- Waste water discharge
- Food & beverage
- Chemical industry