Sewage wastewater was tested the purifying capacity by three constructed wetlands planted with Caladium bicolor (HF1), (Colocasia esculenta) (HF2), (Dracaena sanderiana) (HF3) and HF4 unplanted. HFs were loaded with two hydraulic load rates (HLR) at 0.05 m/d and 0.1 m/d. The planted tanks obtained bigger mean removal of total suspended solid (TSS), biochemical oxygen demand (BOD5) but not clearly with nutrients and total coliform (Tcol). HF planted with Caladium bicolor reached the higher than other HFs in terms of mean removal efficiency, stable and growth of shoots and roots. The mean removal for HF planted ranged 42 – 50% of BOD5, 50 – 53% of TSS, 22 – 31% of ammonia (NH4-N), 49 – 52% of nitrate (NO3-N), 2 – 8% of phosphate (PO4-P) and 75 – 81% of Tcol. The effluent concentrations met Vietnam’s standard apart from some samples at 0.1 m/d passed the discharge limit for BOD5 and Tcol concentrations.
Keywords: constructed wetland, native plant, sewage wastewater
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