On-site disinfectant preparation

Tuesday, 01 January, 2008 | Supplied by: Grundfos Pumps Pty Ltd

Oxiperm systems safely produce a 2% chlorine dioxide (ClO2) solution from commercial sodium chlorite (NaClO2) solution and hydrochloric acid (HCl) on site. The solution is produced and diluted dosed, depending on water flow or the water constitution related demand for ClO2. With control signals from a water meter or a residual controller the system adjusts its capacity automatically.

The amount of water that can be disinfected with chlorine dioxide depends on the injection rate.

Commonly applied injection concentrations for potable water are not higher than 1-2 mg/L, which results in about 0.5-1 mg/L in the pipe network.

For industrial water treatment for cooling towers, cleaning processes or wastewater, not more than 5 ppm are required. Residual concentrations around 0.05 mg/L are still sufficient for secure microbiological conditions.

With 100 g (ClO2)/h and 1 mg/L injection rate, 100 m3/h of water can be treated.

Standard systems up to 220 g/h come with an inline calibration and automatic venting system in the dosing pumps’ head, which makes it easy for operators to control and adjust the systems. Larger standard systems up to 10 kg/h are also available for diverse site conditions.

Disinfection with ClO2 does not depend on pH and no chloramines or chlorinated organic disinfection by-products are generated.

Chlorine-resistant microorganisms mostly show a significant reduction after being treated with CIO2. In the majority of applications only about 50% of ClO2 concentration is required compared to chlorine which reduces negative effects on water substantially (such as taste and odour).

ClO2 does not form chloramines.

Online: www.grundfos.com
Phone: 08 8461 4611
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