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采用XRD、XPS对给水铸铁管腐蚀结垢产物进行表征,结合水相中总铁浓度变化规律,研究了生物膜生长对给水铸铁管腐蚀结垢的影响.结果表明,0～7d时生物膜存在条件下水相中总铁浓度更高,而15～30d时无生物膜生长的对照组水相中总铁浓度更高.有生物膜生长时,锈垢的XRD图谱主峰为铁氧化物;无生物膜生长时,主峰为CaCO3,次峰为铁氧化物,表明生物膜的存在会影响锈垢中晶体的生长及组成.7d时有生物膜生长组锈垢中铁的质量分数更高,而15d和30d时对照组锈垢中铁的质量分数更高.有生物膜生长组锈垢中钙的质量分数始终低于对照组,可能是胞外多聚物吸附或微生物生长消耗钙离子所致.上述结果表明,生物膜发育7d时会促进铸铁管的腐蚀,而发育15～30d时会抑制铸铁管的腐蚀;存在生物膜生长会对铸铁管锈垢的形态和组成产生重要影响.生物膜对腐蚀的抑制作用为控制配水管网管道的腐蚀提供了一条新的途径.
XRD and XPS were used to characterize the corrosion and scaling products of the cast iron pipes and the effects of biofilm growth on the corrosion and fouling of the cast iron pipes were studied based on the changes of the total iron concentration in the aqueous phase.The results showed that the biofilms were present at 0 ~ The total iron concentration in the aqueous phase was higher, while the control group with no biofilm growth at 15 ~ 30d had a higher total iron concentration in the aqueous phase.When biofilm was grown, the main peak of XRD spectrum of scale was iron oxide, The main peak was CaCO3 and the second peak was iron oxide, indicating that the existence of biofilm would affect the growth and composition of the crystals in the scale.At 7d, the mass fraction of iron in the scale of the biofilm growth group was higher, The mass fraction of iron in scale of the control group was higher than that of the control group at the 30th day.The content of calcium in the scale of the biofilm growth group was always lower than that of the control group which may be caused by the adsorption of extracellular polymer or the consumption of calcium ion by microorganism growth It shows that the biofilm development will promote the corrosion of the cast iron pipe on the 7th day and the corrosion of the cast iron pipe will be restrained when the biofilm grows for 15 ~ 30 days. The biofilm growth will have an important influence on the morphology and composition of the cast iron pipe rust. Inhibition for the control with Corrosion pipe network channel provides a new way.