Application Note

Dosing Of Sodium Hypochlorite Solution For Drinking Water Disinfection

Source: KROHNE, Inc.
optiflux

A Spanish water purveyor provides one of the country’s largest municipalities with potable water. The water gets thoroughly cleaned in a water treatment plant first and is then stored in a water reservoir for supply to the distribution network. Before it enters the water reservoir, the drinking water passes through a chlorination station. The water is disinfected by way of chlorine bleaching. To this end, the water company adds a dilute solution with sodium hypochlorite (NaClO) to the water, which guarantees an extended disinfecting effect right up to the drinking water supply point. Accurate dosing of the chlorine solution is of the essence to comply with the domestic drinking water regulations by meeting the required min./max. thresholds.

The client previously used electromagnetic flowmeters (EMF) from a competitor. These flowmeters were frequently damaged by corrosion. They were therefore in urgent need of a chemically resistant flow instrumentation with a long life of service that allowed reliable and long-term stable dosing of the sodium hypochlorite solution.

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