Arsenic Removal Using Horizontal Subsurface Flow Constructed Wetlands: A Sustainable Alternative for Arsenic-Rich Acidic Waters
| Autor: | Gonzalo Montes-Atenas, José Max Ayala, Katherine Lizama-Allende, Eduardo Leiva, Ignacio Jaque |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
lcsh:Hydraulic engineering
constructed wetland horizontal subsurface flow Geography Planning and Development 0211 other engineering and technologies chemistry.chemical_element Wetland 02 engineering and technology Zinc 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry Phragmites lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 arsenic removal Zeolite Subsurface flow Arsenic 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 021110 strategic defence & security studies geography geography.geographical_feature_category supporting media Acid mine drainage chemistry Environmental chemistry Constructed wetland acid mine drainage |
| Zdroj: | Water, Vol 10, Iss 10, p 1447 (2018) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w10101447 |
| Popis: | Constructed wetlands (CW) have been widely used to treat different types of water, including acid mine drainage (AMD). However, little is known about their performance in the removal of As from AMD. In this study, a laboratory-scale horizontal subsurface flow (HSSF) CW system was tested to evaluate its capacity to treat highly acidic, As-rich contaminated water resembling AMD. Vegetated and non-vegetated cells, having limestone or zeolite as the main supporting media, were built and operated to evaluate the effect of the media type and the presence of Phragmites australis on the removal of arsenic, iron (Fe), lead (Pb), and zinc (Zn), and on the neutralization capacity. The four types of cells were highly effective in the removal of As and Pb (removal > 99%), and Fe (removal > 98%), whereas Zn removal rates depended on the cell type. Limestone cells raised the pH from ~1.9 to ~7.5, while zeolite cells raised it to ~4. These results suggest that the media type has a key role in the neutralization capacity, and that the presence of vegetation affected mainly the removal of Zn. Knowledge from this study will contribute to guiding the implementation of HSSF CW for treating As-rich AMD. |
| Databáze: | OpenAIRE |
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