Effect of different media in constructed wetland on the removal of some heavy metals from wastewater | ||
| Mansoura Journal of Chemistry | ||
| Volume 45, Issue 3, August 2019, Pages 18-29 PDF (1.18 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/mjcc.2019.413011 | ||
| Abstract | ||
| Constructed wetlands are natural treatment systems based on using plants, soils, and micro-organisms to improve treated wastewater quality. When compared with other conventional treatment technologies, these systems are efficient and eco-friendly treatment methods for wastewater. A constructed wetland unit was designed in Samaha wastewater treatment station, in Al-Dakahliya governorate, Egypt, in which domestic wastewater was treated. This pilot scale contains three units; each one contains different kind of media, i.e. plastic, gravel and rubber which used to test the removal efficiency of different metal ions. The average removal efficiencywas (59%, 46.1% and 36.9%) for Mn (II), (56%, 49.1% and 42.7%) for Pb (II), (62.3%, 51.4% and 42%) for Fe (III), (67.3%, 58.6% and 51.7%) for Zn (II) and (40.5%, 33.6% and 26.7%) for Cd (II), when using plastic, gravel and rubber media respectively. The removal efficiencies of metal ions were remarkably enhanced after mixing polystyrene foam media with plastic, gravel and rubber, solely. The removal efficiency values became (70.2%, 57.8% and 48.2%) for Mn (II), (64.1%, 56.6% and 50.9%) for Pb (II), (71.3%, 56.9% and 49.3%) for Fe (III), (72.2%, 61.1% and 53.6%) for Zn (II) and (41.1%, 35.5% and 29.2%) for Cd (II), using plastic/polystyrene, gravel/polystyrene and rubber/polystyrene mixtures respectively. This improvement of removal efficiency was explained taking into consideration the aeration effect of polystyrene foam | ||
| Keywords | ||
| wetlands; Polystyrene; Wastewater | ||
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