Removal of Inorganic Contaminants from Simulated Stormwater by Three Sorbents in Columns Under Intermittent Runoff Condition

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Journal Article
Separation Science and Technology (Philadelphia), 2012, 47 (16), pp. 2340 - 2347
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Combined removal of inorganic contaminants from a synthetic stormwater was investigated by their sorption on hydrous ferric oxide (HFO) (5%), HFO + Ca(OH)2(6%), and HFO + Ca(OH)2+ MnO2(7%) in columns containing 93-95% anthracite, conducted under seven intermittent runoffs, each of 8 h duration with a 40 h (drying) period between them. At the initial period when Ca(OH)2produced elevated pHs, the HFO column removed less metals but more Se than the HFO + Ca(OH)2columns. With increased time when the pH effect of Ca(OH)2became insignificant, the MnO2in the column increased the removal of all contaminants. The removal efficiencies (%) at the flow rate of 0.75 m/h for Cd, Cu, Ni, Zn by the HFO + Ca(OH)2+ MnO2column were 88-100%, and Se by the HFO column were 92-94% for the 1st and 3rd runs. The corresponding values for the 5th and 7th runs were 51-88% and 82-88%, respectively. © 2012 Copyright Taylor and Francis Group, LLC.
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