中文摘要：

以实际回用水为研究对象，采用4个CDC反应器串联模拟回用水铸铁输水管道，在系统连续运行505d后，采用SEM、EDS、XRD分析了管道内腐蚀产物的沿程变化特征。此外，在对连续运行期间各反应器中不同形态铁及正磷酸盐磷的浓度进行测定的基础上，研究了腐蚀引起的铁、磷沿程变化。结果表明：模拟回用水铸铁输水管道的腐蚀产物由疏松多孔结构向致密硬壳结构转变；其所含矿物类型主要为γ-Fe2O3、α—FeOOH和FeCO3等化合物；腐蚀产物主要含Fe、O、P、Ca、Al等元素，其中Fe、O含量沿程增加，意味着腐蚀产物中铁、氧化物的含量沿程增加。水质测定结果发现，回用水在系统中流经120min后，水中总铁浓度为进水的23．74倍，其中溶解态铁的贡献不大，增加的主要是铁沉淀物。与此同时，PO4^3-P平均浓度与进水相比降低了18．4％，这与对腐蚀产物的元素分析结果相一致。

英文摘要：

A simulated reclaimed water cast iron pipeline was constructed by using 4 CDC reactors in series, and the practical reclaimed water was used as the influent. Scanning electron microscopy （ SEM）, X-ray energy dispersive spectrometer （EDS） and X-ray diffraction （XRD） were used to analyze the characteristics of the corrosion products formed in the simulated reclaimed water cast iron pipeline on the 505^th day. Meanwhile the concentrations of PO4^3- - P and different forms of iron in the reclaimed water along the pipeline were monitored continuously. The results showed that corrosion products formed in the simulated reclaimed water cast iron pipeline changed from porous to dense shell structure. The mineral compounds such as γ-Fe2O3 , α-FeOOH and FeCO3 were the main components of the corrosion prod- ucts. There were Fe, O, P, Ca, Al and other elements in corrosion products, and the contents of Fe and 0 increased along the pipeline. Moreover the concentration of total iron was 23.74 times of that in the in- fluent after 120 min of flowing in the simulated pipeline, where the precipitated iron was the main source and soluble iron only contributed a small share. At the same time, the concentration of PO4^3- - P was re- duced by 18.4% compared with that in the influent, which was consistent with the elemental analysis re- suits of corrosion products.