Variability of micropollutants and microorganisms in water distribution system

The variation of water quality in water distribution system was investigated with assimilable organic carbon(AOC) and trihalomethanes(THMs) used as assessment indexes.Bacterium was identified in water distribution.The result showed that there were pathogenic parasites in water distribution system.The variation of AOC is related to chlorine residual and bacterium activity,and AOC concentration decreased first and then increased with the extension of water distribution system.The formation of THMs was related to the consumption of chlorine inside the distribution system,and THMs concentration increased with the extension of water pipe line.