ORGANIC-MATTER REMOVAL IN BOILER FEED WATER-TREATMENT OF A POWER-PLANT WITH OZONE

The purpose of this work was to test the effectiveness of ozone as a t reatment to remove organic matter of the boiler feed water of a power plant. In the experiments carried out in the power plant Endesa in As Pontes (Spain), chlorine was substituted for ozone in the pre-treatmen t stage. The use of ozone reduced the organic content of the boiler fe ed water by an average 20% compared with chlorination and by 50% when ozone was combined with hydrogen peroxide. The latter treatment achiev ed an organic content in the boiler feed water of less than 40 mu g C/ L. The ozone treatment also reduced the content of trihalomethanes in the drinking water, produced by the same plant, to values in the range of 10 mu g/L and even to undetectable values when ozone was combined with hydrogen peroxide, in spite of the postchlorination applied to th is stream to ensure a disinfectant capacity though the distribution sy stem.