Chlorine Dioxide measurement for disinfection in drinking water
The Application
The classical disinfection of drinking water using chlorine has some major disadvantages. If organic acids are present, cancerogenous trihalomethanes can be formed. Also residual traces of chlorine in the final water can leave an unpleasant taste.
One of the alternatives is to use chlorine dioxide because it doesn't show the negative effects as mentioned. In addition, it gives much better disinfection efficiency. Chlorine Dioxide is generated directly on site immediately before use. The exact measurement and control of the reactor is crucial. The typical concentration range for optiomal dosing is around 0.2g/l.
Chlorine dioxide measurement can be done reliablyand slectively using an inline absorbance mesuring technique at 325mn.
The Benefits
| Quality: |
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Monitoring and control of the chlorine dioxide reactors |
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Optimum dosing and constant chlorine dioxide concentratiob, therefore consistent water quality. |
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Turbidity compensation by using a second wavelength (546nm) |
| Economic |
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Continuous and practically maintenance-free measurement of the chlorine dioxide concentration |
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Optimal chemical dosage with control over treatment costs |
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Comfortable integration into the central control system by using the optional profibus |
| References |
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Municipal Waterworks Evides near Rotterdam, Netherlands (13 instruments for reactor control, 27 instruments for the control of the dosing) |
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Municipal Waterworks Zurich, Switzerland (5 instruments)
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