Identifying effects of pipe material, hydraulic condition, and water composition on elemental accumulation in pipe corrosion scales
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Identification of the accumulation mechanism of major elements on pipe surface is essential to investigate the development of corrosion scales and co-occurrence of trace inorganic contaminants. In this study, corrosion scale samples were collected from old, corroded iron pipes made of different materials and exposed to different water qualities and operation conditions. Elemental composition of these scales was determined by energy dispersive X-ray spectroscopy (EDS). Cumulative occurrence analysis, Q-style hierarchical cluster analysis (CA), and principal component analysis (PCA) were conducted to ascertain major elements typical for corrosion scales and to estimate the dominant influencing factor to each elemental constituent. The major elements in the examined scales are Fe, C, Zn, Si, Ca, Al, and S in the descending prevalence. Their occurrences are influenced by an interactive effect. Pipe material imposes a significant effect on the accumulation of Fe, Zn, and Ca in corrosion scales; water composition can account for the presence of Si, Al, and S in this study; hydraulic condition is identified as the primary factor influencing the occurrence of C and Ca. Q-style CA and PCA are verified practicable for data interpretation and identification of dominant factors influencing scale characteristics.
KeywordsCorrosion scales Elemental accumulation Pipe material Hydraulic condition Water composition Cluster analysis Principal component analysis
This work was supported by the National Key Research and Development Program of China [No. 2016YFC0502204] and the National Natural Science Foundation of China [No. 51579130, 91647116].
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Conflict of interest
The authors declare that they have no conflict of interest.
- Boxall JB, Dewis N (2005) Identification of discolouration risk through simplified modelling. World Water Environ Resour Congress:1–10Google Scholar
- Friedman MJ, Hill AS, Reiber SH, Valentine RL, Larsen G, Young A, Korshin GV, Peng CY (2010) Assessment of inorganics accumulation in drinking water system scales and sediments. Water Research Foundation, DenverGoogle Scholar
- Husband S, Boxall JB (2010) Discolouration risk management for trunk mains. Water distribution system analysis, pp 535–542Google Scholar
- Li MJ, Liu ZW, Chen YC, Wu YY (2017) Effect mechanism of flow velocity on iron release from pipe surfaces in drinking water distribution systems. E-proceedings of the 37th IAHR world congressGoogle Scholar
- Liu HZ, Schonberger KD, Peng CY, Ferguson JF, Desormeaux E, Meyerhofer P, Luckenbach H, Korshin GV (2013) Effects of blending of desalinated and conventionally treated surface water on iron corrosion and its release from corroding surfaces and pre-existing scales. Water Res 47:3817–3826CrossRefGoogle Scholar
- Shams DF, Islam S, Shi BY, Khan W, Gunawardana B, Saad M, Qasim M, Javed HA, Afridi AG, Naeem M, Khan GS (2019) Characteristics of pipe corrosion scales in untreated water distribution system and effect on water quality in Peshawar, Pakistan. Environ Sci Pollut Res 26(6):5794–5803CrossRefGoogle Scholar
- Sharpe RL, Smith CJ, Boxall JB, Biggs CA (2010) Pilot scale laboratory investigations into the impact of steady state conditioning flow on potable water discolouration. Water Distribution System Analysis 494–506Google Scholar