C.-S. Ting, Y.-P. Huang, H.-T. Tsai, and H.-H. Hsieh (Taiwan)
constructed wetland, filter bed, free water surface, removal efficiency
The purpose of this research was to investigate the water quality improvement of a wastewater treatment research in a large-scale constructed wetland, Southern Taiwan. The constructed wetland was built combining filter beds and three free water surface (FWS) systems, and the pollutions of pH, temperature (temp.), dissolved oxygen (DO), suspended solids (SS), biochemical oxygen demand (BOD5), and ammonia nitrogen (NH3-N) were investigated in this research. In SS and BOD5 pollutions analysis, the results indicated that water pollution conditions were improved from heavy-polluted water to light-polluted water and the mean concentration values were improved in the range of 141-8 mg L-1 and 26-3 mg L-1 , respectively. In DO and NH3-N pollutions analysis, the results indicated that water pollution conditions still were heavily polluted, although the mean NH3-N concentration values were improved in the range from 8.4 mg L-1 to 3.5 mg L-1 . In addition, the constructed wetland system still kept high and stable removal efficiency in SS, BOD5 and NH3-N pollutions after approximately 19 months, and the mean removal efficiencies were 81±25%, 83±15%, and 61 ± 28%, respectively. Moreover, the mean removal efficiencies of the FWS system were superior to the filter bed system.
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