供水管壁的磷释放对管网水质生物稳定性的影响

为了研究供水系统金属管壁磷释放及其对管网水质生物稳定性的影响,采用新旧有水泥涂衬球墨铸铁管,考察了管壁和水泥涂衬中磷的含量,管网水中可同化有机碳(AOC)、异养菌平板计数(HPC)及生物可利用磷(MAP)的变化规律.结果表明,在铸铁管金属管壁和水泥涂衬中均有磷元素及其他微生物生长所需微量元素存在.旧管和新管均可向悬浮水中释放磷元素并可被微生物吸收利用,旧管释放水平高于新管;同时旧管释放产生的AOC和旧管水中的HPC也明显高于新管;新管对水中pH值有明显影响,但随时间推移逐渐减弱.

Effect of phosphorus release from iron pipe wall on biostability in water distribution system

In order to study the phosphorus release from the cement-lined pipe and its implication for biostability of drinking water, a new and an old cement lined iron pipe were applied to study the content of phosphorus in cement liner and iron pipe, phosphorus release to the water and variation of assimilable organic carbon(AOC), heterotrophic plate counts(HPC) and microbial available phosphorus(MAP) in pipe water. Existence of phosphorus and many other trace elements for microbial regrowth was observed. Both kinds of iron pipes could release microbial available phosphorus into the water while the old pipe could release more phosphorus than the new one. AOC and HPC in the old pipe were higher than those in the new pipe. The new pipe obviously influenced pH value in the water, but the influence was gradually weakened.