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Int. J. Environ. Res. Public Health 2017, 14(6), 660; doi:10.3390/ijerph14060660

Effects of Sulfate, Chloride, and Bicarbonate on Iron Stability in a PVC-U Drinking Pipe

College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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Author to whom correspondence should be addressed.
Academic Editor: Yu-Pin Lin
Received: 22 May 2017 / Revised: 9 June 2017 / Accepted: 15 June 2017 / Published: 19 June 2017
(This article belongs to the Section Environmental Engineering and Public Health)
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Abstract

In order to describe iron stability in plastic pipes and to ensure the drinking water security, the influence factors and rules for iron adsorption and release were studied, dependent on the Unplasticized poly (vinyl chloride) (PVC-U) drinking pipes employed in this research. In this paper, sulfate, chloride, and bicarbonate, as well as synthesized models, were chosen to investigate the iron stability on the inner wall of PVC-U drinking pipes. The existence of the three kinds of anions could significantly affect the process of iron adsorption, and a positive association was found between the level of anion concentration and the adsorption rate. However, the scaling formed on the inner surface of the pipes would be released into the water under certain conditions. The Larson Index (LI), used for a synthetic consideration of anion effects on iron stability, was selected to investigate the iron release under multi-factor conditions. Moreover, a well fitted linear model was established to gain a better understanding of iron release under multi-factor conditions. The simulation results demonstrated that the linear model was better fitted than the LI model for the prediction of iron release. View Full-Text
Keywords: sulfate; chloride; bicarbonate; iron stability; PVC-U drinking pipe; water; models sulfate; chloride; bicarbonate; iron stability; PVC-U drinking pipe; water; models
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MDPI and ACS Style

Wang, J.; Tao, T.; Yan, H. Effects of Sulfate, Chloride, and Bicarbonate on Iron Stability in a PVC-U Drinking Pipe. Int. J. Environ. Res. Public Health 2017, 14, 660.

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