Removal of heavy metals in stormwater by hydrous ferric oxide

Publication Type:
Journal Article
Proceedings of the Institution of Civil Engineers: Water Management, 2012, 165 (3), pp. 171 - 178
Issue Date:
Filename Description Size
Thumbnail2011001399OK.pdf314.88 kB
Adobe PDF
Full metadata record
Stormwater runoff from urban and industrial areas contains several types of heavy metals that have negative ecological impacts on receiving waters, and therefore methods need to be developed to remove these pollutants. Combined removal of a mixture of heavy metal cations (Cu 2+, Zn 2+, Cd 2+, and Ni 2+) and an oxy anion (selenate, SeO 4-) from an artificially prepared stormwater was investigated by sorption of these heavy metals on hydrous ferric oxide (HFO) in a column experiment under intermittent runoff (wetting and drying) condition, as occurs between rainfall events in the field. The heavy metal removal behaviour varied between ions as well as with time. In each continuous column run (8 h) the amount of ions removed progressively decreased with time and reached a constant level at approximately 4-6 h. However, stopping the runoff for 40 h and starting the next runoff after this period removed a large quantity of heavy metals in the first few hours of this run. The intermittent runoff for seven runs showed that HFO has a high capacity to remove copper and zinc, which were present in higher concentrations in the stormwater than cadmium, nickel and selenium.
Please use this identifier to cite or link to this item: