不同管材对氯胺消毒副产物生成与水质生物稳定性的影响

模拟考察了上海某水厂出厂水在不同输配管网体系中水质的变化规律,研究了管材和氯胺投加量对输配过程水质变化的影响.结果表明,不同输配管网体系氯胺的衰减速率总体上符合如下规律:镀锌管铜管不锈钢管聚乙烯管(PE管)三型聚丙烯管(PPR管),季节因素对氯胺衰减速率影响较大,秋冬季节氯胺衰减的速率显著降低;消毒副产物三卤甲烷(THMs)和卤乙酸(HAAs)的生成规律为:PE管≈PPR管玻璃管不锈钢管铜管镀锌管;五种管材中异氧菌总数(HPC)的生长数量为:镀锌管PE管不锈钢管PPR管铜管;铜管和PE管中生物可同化有机碳(AOC)显著高于其余管材及出厂水.

Effect of pipe materials on disinfection byproduct generated by monochloramine and biological stability of water quality

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.