CHLORINATION BY-PRODUCTS IN CHLORINATED COOLING WATER OF SOME EUROPEAN COASTAL POWER-STATIONS

Chlorination by-products (CBPs) ape formed as a result of the chlorina tion of power station cooling water for anti-fouling purposes. Their p roduction was studied at 10 coastal power stations in the UK, France a nd The Netherlands. Three categories of CBPs were determined. trihalom ethanes; haloacetonitriles; and halophenols. Bromoform was the CBP mos t abundantly present in the effluents of all 10 power stations. At a m ean chlorine dosage of 0.5-1.5 mg/litre (as Cl-2) the mean bromoform c oncentration was 16.32 +/- 2.10 mu g/litre. The CBP found in second hi ghest concentrations was dibromoacetonitrile (DBAN) with mean concentr ations of 1.48 +/- 0.56 mu g/litre. Other CBPs detected were dibromoch loromethane, bromodichloromethane and 2,4,6-trichlorophenol; concentra tions of these three compounds were very low (<1 mu g/litre). At those sites at which bromoform was measured in the dispersing effluent plum e it was found to behave as a conservative parameter (significant dire ct correlation with plume Delta T). Copyright (C) 1996 Elsevier Scienc e Ltd.