The removal of heavy metals by iron mine drainage sludge and Phragmites australis

2nd Transdisciplinary Research on Environmental Problems in Southeast Asia

地球科学;生态环境科学

Thi Hoang Ha, Nguyen^1 ; Thi Kim Anh, Bui^2

VNU University of Science, 334 Nguyen Trai, Hanoi, Viet Nam^1

Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Viet Nam^2

关键词: Column surfaces;    Constructed wetlands;    Industrial wastewaters;    Mine drainage;    Phragmites australis;    Subsurface flow constructed wetlands;    Surface and subsurface flow;    Surface systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/71/1/012022/pdf
DOI  :  10.1088/1755-1315/71/1/012022

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This study was conducted to assess the removal of heavy metals from solutions by the combination of modified iron mine drainage sludge (sorbent column) and surface and subsurface flow constructed wetlands using the common reed (Phragmites australis) during 30 days of experiment. The results of this study demonstrated that the average removal rates of Zn, Pb, Mn, and As by sorbent column were 59.0, 55.1, 38.7, and 42.4%, respectively. The decreasing trend of removal rates of metals by sorbent column was obtained during the experiment. The average removal rates of Zn, Pb, Mn, and As by sorbent column-surface constructed wetland were 78.9, 73.5, 91.2, and 80.5%, respectively; those by sorbent column-subsurface flow constructed wetland were 81.7, 81.1, 94.1, and 83.1% which reflected that subsurface flow constructed wetland showed higher removal rate than the surface system. Concentrations of heavy metals in the outlet water were lower than the Vietnamese standard limits regulated for industrial wastewater. The results indicate the feasibility of integration of iron mine drainage sludge and constructed wetlands for wastewater treatment.