Four years experience with a new chlorine dosing regime against macrofouling

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Courtesy of Sweco Nederland BV

A new method of chlorination called Pulse-Chlorination® was developed by KEMA in 1998. Pulse- Chlorination is based on the principle that mussels and clams, in general have a recovery period before full opening and start filtering after exposure to a chlorination period. The chlorination method takes advantage of this recovery time by using short successive periods of chlorination, alternating with periods without chlorine. The full scale tests on site, among others at E.ON power station ‘Maasvlakte’ between 1999 and 2003 resulted in extremely clean condensers. The overall result is better performance of the cooling water system (K-value) and therefore less maintenance is necessary. This in turn allows longer intervals between planned outages and brings down the running costs on the basis of circa € 50.000 per day spread out over three years rather than two years.

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