Analysis on the fractionation of heavy metals in a tree box filter treatinf urban runoff

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Document Type

Article

Source Title

Desalination and Water Treatment

Volume

158

First Page

114

Last Page

120

Publication Date

2019

Abstract

Nineteen storm events were monitored between July 2010 and September 2013 to determine the relative fractions of dissolved and particulate-bound heavy metal mass in runoff entering and exiting a tree box filter that was developed and constructed for the treatment of suspended solids and heavy metal constituents (Fe, Zn, Pb, Cr, Cu, Cd, Ni) in a parking lot runoff. Findings revealed that the system was capable of reducing the particulate-bound fraction of Ni, Cu, Zn and Cd; and the dissolved fraction of all the heavy metals. Majority of storm events favored the reduction of the predominately particulate-bound heavy metals such as Fe, Zn and Pb. TSS concentration was found to influence the generation and more likely the reduction of heavy metals in the tree box fil- ter. The metal elements in the outflow were evidently dissolved with higher TSS concentration and particulate-bound with lower TSS concentration in the inflow. The fractionation of metals was found to be independent of the treated runoff rather by the incoming runoff particularly the concentration of particulate matters in it. The adsorption capacity of metals was ranked from greatest to least as follows Fe > Zn = Cd > Pb > Cu > Cr > Ni.

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Disciplines

Civil and Environmental Engineering

Keywords

Urban runoff; Runoff—Purification—Heavy metals removal

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