饮用水中磷与细菌再生长的关系

采用改进的可同化有机碳(AOC)和微生物可利用磷(MAP)方法,针对T市J水厂水源水、处理工艺以及一条配水干管中磷对细菌生长的限制作用进行了研究.结果表明:①水源水与处理工艺中MAP较高(5～38μg/L),配水管网中MAP较低(<5μg/L),且管网水中的MAP随着管线的延长基本保持不变.②常规处理工艺能够有效地去除水中的MAP(去除率为34.0%～83.7%).③在水源水和处理工艺中,水样的AOC_{potential<、sub>、AOCP与AOCnative没有显著差别,说明AOC是微生物生长繁殖的决定因素.该研究配水干管中,水样的AOCpotential、AOCP为AOCnative的2～8.7倍,磷成为细菌再生长的限制因子.}

Relationship Between Phosphorus and Bacterial Regrowth in Drinking Water

Limitation of phosphorus on bacterial regrowth was studied in source water, water treatment process and a main distribution pipe of J waterwork in T city, by modified assimilable organic carbon (AOC) method and microbially available phosphorus (MAP) analysis. Based on the study, the result showed that: (1) Concentration of MAP was higher in source water and water treatment process, which was 5-38 microg/L (PO4(3-)-P). However in water distribution system, concentration of MAP was lower, which was less than 5 microg/L (PO4(3-)-P). It changed very little in distribution system. (2) Traditional treatment process can remove MAP efficiently 34.0%-83.7% of MAP can be removed in the process. (3) Generally in source water and water treatment process, there was no evident difference between AOC(potential), AOC(P) and AOC(native). So AOC was the most important factor of bacterial growth. In the main distribution pipe, the concentration of AOC(potential) and AOC(P) were 2-8.7 times of the concentration of AOC(native). So phosphorus limited bacterial regrowth.