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- W2320932311 abstract "This study investigated the effects of orthophosphate, tripolyphosphate and hexametaphosphate on iron release control under the conditions of different sulphate concentrations in drinking water distribution systems. The results showed that all three kinds of phosphates had positive effects on controlling the iron release from corrosion scales in distribution systems. Tripolyphosphate was the most effective inhibitor on controlling the release of iron in bulk water, with the addition dosages of 0.50 mg/L and 0.25 mg/L acting better than that of 0.10 mg/L. Hexametaphosphate performed best on controlling color in bulk water, with the addition dosage of 0.10mg/L achieving the average reduction rate over 40%. Thus, hexametaphosphate was chosen as one kind of preferred inhibitor to iron release because the discolored water phenomenon in the tap could easily cause the customer complaints. Whatever the low (75 mg/L), the middle (150 mg/L) or the high (240 mg/L) concentrations of sulphate, adding different dosages of hexametaphosphate (0.10-0.50 mg/L) all had a significant controlling effect on iron release, with the average reduction rates of the total iron concentration, turbidity and color being 15% to 55%, 35% to 85% and 40% to 92% respectively. While stopping the addition of hexametaphosphate in bulk water in drinking water distribution systems under low-sulphate and mid-sulphate conditions, total iron concentration in bulk water slightly increased in first one or two days. It then returned to the low levels after 10 days. However, under high-sulphate conditions, the water quality in drinking water distribution systems deteriorated immediately after stopping hexametaphosphate and could not recover after 10 days." @default.
- W2320932311 created "2016-06-24" @default.
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- W2320932311 date "2013-10-01" @default.
- W2320932311 modified "2023-09-25" @default.
- W2320932311 title "Effects of Adding Phosphates on Iron Release Control in Drinking Water Pipelines" @default.
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- W2320932311 doi "https://doi.org/10.1061/9780784413142.129" @default.
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