Abstract:

raditional methods for the enhancement of phosphorus removal efficiency in wastewater often concentrated on the selection of substrates and wetland plant species.In this research，another method by adjusting the process of combination of wetland to improve phosphorus removal efficiency were tested.The author compared the removal efficiency of phosphorus in eutrophic lake water in eight different combination systems，including plugflowdownflowup flow wetland，downflowupflowplugflow wetland，oxidation ponddownflow，downflowpond，plugflow constructed wetland in twoyear inspection.It was indicated that the pond process could not be installed as the end process.The results also showed that the process of downflow combined with upflow wetland was better than other kind of combined process in cold and warm weather，the endurance of this kind of combination to high hydraulic loading was also more preferable than others.That is to say，the downflowupflow process was an ideal combined wetland process in treating wastewater.This kind of novel constructed wetland should be well used in the purification of eutrophic water.

Key words: constructed wetland, phosphorous, combination process, hydraulic loading, seasonal change