Removal of dissolved metals in wetland columns filled with shell grits and plant biomass

Bavandpour, Firoozeh, Zou, Yuanchun, He, Yinghe, Saeed, Tanveer, Sun, Yong, and Sun, Guangzhi (2018) Removal of dissolved metals in wetland columns filled with shell grits and plant biomass. Chemical Engineering Journal, 331. pp. 234-241.

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Abstract

Two lab-scale wetland systems were studied for the removal of dissolved Cu, Mn, Fe, Pb and Zn. Vegetated with Typha domingensis, each system consisted of two units, a vertical and a horizontal flow wetland column, which were filled with either crushed sea shell grits or composted green waste as main media. A synthetic acidic wastewater was prepared by dissolving H2SO4, Pb(CH3COO)2, MnCl2, FeSO4, CuSO4 and ZnSO4 in a distilled water. As it passed through each column, metal concentrations, pH and conductivity were monitored. The pH value of the wastewater increased in the shell grit columns, where dissolved metals were almost completely (>99%) removed. In the wetland columns filled with the green waste, the average percentage removals were 90, 77, 27, 98 and 75% for Cu, Mn, Fe, Pb and Zn, respectively. Scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS) analysis showed that the surface characteristics of the shell grits remained largely unchanged before and after being used in the columns; but the mass compositions of carbon increased, whereas calcium and oxygen decreased. Infrared spectroscopy (IR) and X-ray diffraction (XRD) were used to further analyse the chemical compositions and functional groups of the surfaces of the shell grits.

Item ID: 51711
Item Type: Article (Research - C1)
ISSN: 1873-3212
Keywords: constructed wetland, heavy metals, nonhazardous waste, wastewater treatment
Copyright Information: © 2017 Elsevier B.V. All rights reserved.
Date Deposited: 06 Dec 2017 07:30
FoR Codes: 09 ENGINEERING > 0907 Environmental Engineering > 090703 Environmental Technologies @ 100%
SEO Codes: 96 ENVIRONMENT > 9612 Rehabilitation of Degraded Environments > 961299 Rehabilitation of Degraded Environments not elsewhere classified @ 100%
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