【摘要】 对我国北方A市市区配水管网中可同化有机碳(AOC)与细菌再生长关系的研究表明:降雨量对水源水和管网水中AOC含量影响显著;HPCR2A的计数结果较吖啶橙染色直接计数(AODC)的低2～3个数量级,仅占AODC计数结果的0.1%～2.0%;使用传统琼脂培养基的HPC计数结果又比使用R2A培养基的HPC计数结果低1～2个数量级(前者仅占后者的0.4%～8.4%),有时甚至会出现未检出或检出量极低的情况,不利于试验研究;A市管网水中的AOC含量和异养菌总数的相关性较差,当AOC较低时(<100μg乙酸碳/L)异养菌已经大量繁殖(>104个/mL),而在AOC浓度较高(>200μg乙酸碳/L)的情况下异养菌数量却相对较低(102个/mL)。因此要控制管网水中细菌的再生长,应将AOC的控制与消毒剂余量的控制相结合。更多还原

【Abstract】 Study was made on the relationships between AOC and bacterial regrowth in distributing network in some northern cities of China.It was found that rainfall has significant influence on AOC content in source water and distribution water.The result showed that count of HPC_R2A is lower than that of acridine orange direct counts（ AODC） by 2 ～ 3 orders of magnitude and is only 0.1% ～2.0% of AODC.The count of HPC by using traditional agar is reduced by 1 ～ 2 orders of magnitude as compared with that by using R2A （the former accounts for 0.4% ～ 8.4% of the latter）,sometimes traditional agar can’t count HPC,which is unfavorable to the study.In distributing network of a city,AOC content is less correlative with amount of heterotrophic bacteria.When AOC is lower （<100 μg acetate carbon/L）,proliferation of heterotrophic bacteria has occurred （>10⁴ CFU/mL）;in the case of higher AOC （>200 μg acetate carbon/L）,the amount of heterotrophic bacteria is lower （10² CFU/mL）.Consequently,in order to control the bacterial regrowth,control of AOC shall be considered together with maintenance of residual chlorine.更多还原