硫酸根、氯离子和碱度对管网金属释放的影响

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Abstract Changes of drinking water quality can cause the release of heavy metals in drinking water distribution systems (DWDSs), resulting in water discoloration and potential risk to human health. In this study, the influences of sulfate (SO₄^2-), chloride (Cl^-) and alkalinity on metal release in DWDSs were investigated using static experimental systems, including iron (Fe), manganese (Mn), arsenic (As), and copper (Cu). The results show that the concentrations of dissolved oxygen (DO) were decreased with the increase of SO₄^2- and Cl^-, while the values of turbidity were increased dramatically. Under higher alkalinity, both DO and turbidity were reduced gradually. The release of Fe, Mn, As, and Cu were promoted by SO₄^2- and Cl^-. When the concentration of SO₄^2- was 100mg/L, the maximum concentrations of Fe, Mn, As, and Cu in steel pipes were 2.20mg/L, 45.15, 0.74, and 5.41μg/L, respectively. The values in cast iron pipes were 1.06mg/L, 9.31, 0.76, and 5.43μg/L, respectively. Similarly, with the Cl^- level of 100mg/L, the concentration of the four metals were highest. However, the increase of alkalinity inhibited metal release. When the alkalinity was increased from 70mg/L CaCO₃ to 200mg/L CaCO₃, the release of Fe, Mn, As, and Cu at 48h in steel pipes were reduced by 0.38mg/L, 7.60, 0.09, and 2.30μg/L, respectively. Under the same condition, the release of the four metals in cast iron pipes were decreased by 0.44mg/L, 3.73, 0.12, and 1.29μg/L, respectively. Significant differences of Fe and Mn release were observed between steel and cast iron pipes. Nevertheless, pipe materials had fewer influences on As and Cu release. This research can provide theoretical basis and technological support for the control of drinking water secondary pollution.

Key words： drinking water distribution system chloride sulfate alkalinity heavy metal

Received: 26 October 2023

PACS:

X131.2

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	ZHANG Hui
	ZHANG Shan
	YANG Min
	WANG Long
	ZHOU Jun-yang
	WANG Zhang-chi
	FAN Ming-zhou
	LU Jin-suo

Cite this article:

ZHANG Hui,ZHANG Shan,YANG Min等. Effects of sulfate, chloride, and alkalinity on the release of heavy metals in drinking water distribution systems[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(5): 2534-2542.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I5/2534

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