饮用水中磷与细菌再生长的关系

Relationship Between Phosphorus and Bacterial Regrowth in Drinking Water

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(<5 μg/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AOCpotential、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 。

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: ①Concentration of MAP was higher in source water and water treatment process, which was 5～38μg/L(PO 3- 4 P). However in water distribution system, concentration of MAP was lower, which was less than 5μg/L(PO 3- 4 P). It changed very little in distribution system.②Traditional 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.