Application In Circularly Purifying Landscape Water With Constructed Greenland

The cityscape water body regarded as the important component and elementary producers of the urban ecosystem and as the regulation and control of ecological balance person demonstrated its irreplaceable function and meaning day by day in urban ecology construction. Meanwhile, its water quality was polluting seriously day by day, and it was very essential to control its pollution situation. This subject aimed at developing an easy, effective and combined with city natural ecosystem wastewater treatment technology for cityscape water body .Protecting landscape water body mainly controlled its content of COD, BOD5, TN and TP and the growth of algae. Keeping it clean and the whole water quality. This research was about constructed green land system treating East Lake of Wuhan planting Bermuda grass. Results showed:(1) Constructed green land had better purifying effect to landscape water polluted while testing, could improve its water quality at little. The purification efficiency varied in line with temperature and seasons, hydraulic loading values and the growth of plant. The total removal rates of COD, TN and TP were 52.1%> 62.2% and 41.3% separately. The effluent of COD and TN could be improved 1~2 grades of water body at least no matter in which situation for influent.(2) Hydraulic loading was an important parameter influencing purifying effect of constructed green land. This test had designed five smaller hydraulic loading value, synthesizing their purification results and considering economic factor in actual project, 0.3m3/m2 · d was rational to this test.(3) The plant of constructed green land played an important role in treating wastewater. It could purify sewage effectively, also afforest and beautify the view, which had good ecological benefits. The plant chosen in this test was relatively suitable for the climate of Wuhan, and had relatively long green issue, could be as a choice for plant species of constructed green land treating landscape water in tropical and subtropical area.Constructed green land could be widely applied to urban landscape water body polluted, "city garden" landscape water, effluent of sewage treatment plant, urban and agricultural surface flow, etc.