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As a typical eco-technology,the constructed wetland (CW) has been widely used in water purification and restoration,non-point source pollution control,storm water treatment and utilization,wastewater treatment because of low capital and operational costs,excellent effluent quality.Recently people pay more and more attention to application of the CW in advanced treatment for secondarry effluent of wastewater treatment plants (WWTPs) because it can greatly cut down pollutants loading into receiving water.