Three pilot scale non-vegetated constructed wetland with graded sand bed systems (N-VCWGS) were investigated for the treatment of hazardous landfill leachate and heavy metals removal. The reactors were filled with graded sand media. The pilot systems were operated at the same Hydraulic Retention Time (HRT) of 5 days. The results showed that the N-VCWGS which consists of three reactors (CW3) was very efficient for the removal of heavy metals. The removal efficiency was 63% for iron (Fe+3), 89% for copper (Cu+2), and 68% for manganese (Mn+2). The results showed that it was very efficient in ammonia removal with efficiency 84%, total suspended solids removal efficiency was 48%, and 62% removal efficiency for volatile suspended solids. The results approved that vegetation is not essential for heavy metals removal and hazardous landfill leachate treatment, but it has an important role in Chemical Oxygen Demand (COD) removal due to the higher microbial activities and aeration in root zone.
Naira H. Dawi, Egypt-Japan University of Science and Technology (E-JUST), Egypt
Ahmed Tawfik, Egypt-Japan University of Science and Technology (E-JUST), Egypt
Stream: Environmental Sustainability & Human Consumption: Waste
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