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

摘要

Combined removal of inorganic contaminants from a synthetic stormwater was investigated by their sorption on hydrous ferric oxide (HFO) (5%), HFOÂ +Â Ca(OH)₂(6%), and HFOÂ +Â Ca(OH)₂Â +Â MnO₂ (7%) in columns containing 93-95% anthracite, conducted under seven intermittent runoffs, each of 8Â h duration with a 40Â h (drying) period between them. At the initial period when Ca(OH)₂ produced elevated pHs, the HFO column removed less metals but more Se than the HFOÂ +Â Ca(OH)₂ columns. With increased time when the pH effect of Ca(OH)₂ became insignificant, the MnO₂ in the column increased the removal of all contaminants. The removal efficiencies (%) at the flow rate of 0.75Â m/h for Cd, Cu, Ni, Zn by the HFOÂ +Â Ca(OH)₂Â +Â MnO₂ column 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.View full textDownload full textKeywordshydrous ferric oxide, metals, selenium, sorption, sorption kineticsRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/01496395.2012.670684