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| Effect of pipe materials on disinfection byproduct generated by monochloramine and biological stability of water quality |
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Abstract A simulated distribution system was employed to investigate water quality of effluent in one plant in Shanghai, and effect of five kinds of pipes and monochloramine dose on water quality were studied. Generally, decay rate of monochloramine in different pipes fitted with the following trend: galvanized pipe > copper pipe > stainless steel pipe > PE pipe > PPR pipe. The season had much effect on decay rate of monochloramine, which was much lower in autumn and winter than that in other two seasons. The formation of trihalomethanes (THMs) and haloacetic acids (HAAs) followed degressive order: PE ~ PPR > glass > stainless steel > copper > galvanized pipe. The value of heterotrophic plate counts (HPC) followed the decending order: galvanized pipe >> PE > stainless steel > PPR > copper. Concentration of assimilable organic carbon (AOC) in copper and PE pipe was much higher than that in other pipes.
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Received: 15 December 2009
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