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PILOT-SCALE REMOVAL OF ARSENIC AND HEAVY METALS FROM MINING WASTEWATER USING ADSORPTION COMBINED WITH CONSTRUCTED WETLAND
Nguyen, H.T.H., B.Q. Nguyen, T.T. Duong, A.T.K. Bui, H.T.A. Nguyen, H.T. Cao, et al.
Minerals 9:379(2019)
A pilot study was conducted to assess the removal of As and heavy metals from mining wastewater by combining adsorption (using modified iron-ore drainage sludge) and horizontal-subsurface-flow constructed wetland with common reed (Phragmites australis). The pilot-scale experiment operated with a constant flow rate of 5 m3/day for four months using real wastewater from a Pb-Zn mine in northern Vietnam. Atomic absorption spectroscopy was used for elemental analysis in the wastewater and plants. X-ray diffraction, surface charge measurements (by a particle charge detector), Fourier-transform infrared, and surface area Brunauer-Emmet-Teller measurements determined the characteristics of the adsorbent. Results showed that the average removals of As, Mn, Cd, Zn, and Pb by the combined system with limestone substrate during four months were 80.3%, 96.9%, 79.6%, 52.9%, and 38.7%, respectively. The use of another constructed wetland substrate, laterite, demonstrated better removal efficiency of As than limestone. The concentrations of As and heavy metals in the effluent were lower than the limits established for industrial wastewater, which indicated the feasibility of combining adsorption and constructed wetland for the treatment of mining wastewater. https://www.mdpi.com/2075-163X/9/6/379/pdf
Minerals 9:379(2019)
A pilot study was conducted to assess the removal of As and heavy metals from mining wastewater by combining adsorption (using modified iron-ore drainage sludge) and horizontal-subsurface-flow constructed wetland with common reed (Phragmites australis). The pilot-scale experiment operated with a constant flow rate of 5 m3/day for four months using real wastewater from a Pb-Zn mine in northern Vietnam. Atomic absorption spectroscopy was used for elemental analysis in the wastewater and plants. X-ray diffraction, surface charge measurements (by a particle charge detector), Fourier-transform infrared, and surface area Brunauer-Emmet-Teller measurements determined the characteristics of the adsorbent. Results showed that the average removals of As, Mn, Cd, Zn, and Pb by the combined system with limestone substrate during four months were 80.3%, 96.9%, 79.6%, 52.9%, and 38.7%, respectively. The use of another constructed wetland substrate, laterite, demonstrated better removal efficiency of As than limestone. The concentrations of As and heavy metals in the effluent were lower than the limits established for industrial wastewater, which indicated the feasibility of combining adsorption and constructed wetland for the treatment of mining wastewater. https://www.mdpi.com/2075-163X/9/6/379/pdf
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