KINETICS OF NITRATE FORMATION IN BREAKPOINT CHLORINATION
Abstract:The kinetics of nitrate formation during chlorination of aqueous ammonia-nitrogen above breakpoint levels was studied in batch mode at 25°C and pH ranging between 6.6 and 8.7. The time dependent species profiles indicate that a substantial fraction of ammonia is converted to nitrate while combined chlorine species rapidly form and decay. For all experimental conditions, nitrate concentration approached an asymptote as combined chlorine species fully decayed and free chlorine concentration leveled off. The rate of nitrate formation was found to increase with increasing MDR (chlorine to ammonia-nitrogen molar dose ratio) and initial ammonia concentration, but decreased as solution pH became more basic.
Document Type: Research Article
Publication date: January 1, 2000
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