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Outline
The release of iron in drinking water distribution systems (DWDSs) poses a severe threat to water supply safety. By establishing a static simulation experimental system to systematically investigate the coupled effects of fulvic acid (FA), sulfate ions (SO42-), and alkalinity (Alk) on iron release in DWDSs and the changes of pipe scale micromorphology, crystalline composition, and elemental speciation. Based on principal component analysis (PCA), a prediction model for iron release was developed, quantitatively characterizing the relative importance of various influencing factors and their interaction intensities. Results showed that under conditions of FA=4mg/L, SO42-=240mg/L, and Alk =100mg/L CaCO3, iron release reached the maximum of 4.82 and 3.60mg/L for steel and cast iron pipes, respectively. SO42- and FA were positively correlated with iron release, while alkalinity showed negative correlations. The relative influences of these factors followed the order: alkalinity > SO42- > FA.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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