Cadmium removal from urban stormwater runoff via bioretention technology and effluent risk assessment for discharge to surface water

Journal of Contaminant Hydrology
Jianlong WangTao Huang

Abstract

Bioretention technology, a low-impact development stormwater management measure, was evaluated for its ability to remove heavy metals (specifically cadmium, Cd) from urban stormwater runoff. Fine sand, zeolite, sand and quartz sand were selected as composite bioretention media. The effects of these materials on the removal efficiency, chemical forms, and accumulation and migration characteristics of Cd were examined in laboratory scale bioretention columns. Heretofore, few studies have examined the removal of Cd by bioretention. A five-step sequential extraction method, a single-contamination index method, and an empirical migration equation were used in the experiments. The average Cd removal efficiency of quartz sand approached 99%, and removal by the other media all exceeded 90%. The media types markedly affected the forms of Cd found in the columns as well as its vertical migration rate. The Cd accumulated in the four media was mainly in residual form; moreover, accumulation of Cd occurred mainly in the surface layer of the bioretention column. The migration depth of Cd in the four media increased with elapsed time, in the following sequence: zeolite>quartz sand>fine sand>sand. In contrast, the migration rate decreased with...Continue Reading

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Citations

Apr 21, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jianping GaoChengzuo Xie
May 4, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Ying MeiChein-Chi Chang
Oct 9, 2019·Environmental Science and Pollution Research International·Rui-Song ZhaoHuai-En Li
Feb 24, 2021·Journal of Contaminant Hydrology·Concepcion PlaZdenka Kovacova
Jun 20, 2021·Journal of Environmental Management·Matthew T WilfongDavid R Ownby

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