pH值、硫酸根和温度对钢管管垢中铬释放的影响

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Abstract The scales of steel pipes in water distribution systems were researched by dividing them into a surface layer, a shell-like layer, and a porous core layer inward. We characterized and analyzed the three layers before and after the adsorption of Cr(VI) using SEM, BET, XRD, XPS, and Tessier sequential extraction and investigated the impact of pH, SO₄^2- concentrations and temperatures on the Cr release from each layer. Results showed that α-FeOOH was the primary component in all layers, and the adsorption capacity in the surface layer, porous core layer, and shell-like layer decreased in order. Iron scales existed mainly in Fe(III) and Fe(II) with certain reducibility. Cr(VI) could physically and chemically adsorb on the corrosion scales, mainly in Fe-Mn oxides. The amount of Cr accumulated on the surface layer was the largest. Low pH, high SO₄^2- concentration, and high temperature promoted the Cr release. Specifically, the Cr release concentration from the surface layer was 2.76 times under strong acidic conditions than under neutral conditions, the one from all layers was increased by 0.1~0.4 times with the increase of SO₄^2- concentration, and the one from the surface layer was increased by 26.74% with temperature increased by 20℃.

Key words： water distribution systems layering of pipe scale Cr release

Received: 24 May 2022

PACS:

X131.2

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	Articles by authors
	LIU Jing
	TIAN Yi-mei
	LIU Yun-hui
	CHU Xian-xian
	LIU Ran
	SHAN Jin-lin

Cite this article:

LIU Jing,TIAN Yi-mei,LIU Yun-hui等. Effects of pH, sulfate and temperature on chromium release from steel pipe scales[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5679-5686.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5679

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