Ecological Remediation Of Regeneration Landscape Water With Vertical Subsurface Flow Constructed Wetland

This paper studied the vertical subsurface flow constructed wetland restoration of landscapewater. The results show that, under the conditions of temperature of25~38℃, the hydraulic load is1.2m/d~2.5m3/(m2·d) the influent concentrations of COD,TN,TP were93.62to364.86mg/L,14.87~88.56mg/L,6.38~53.75mg/L,0.16~1.79mg/L. the average effluent concentrations of COD,TN,TP for the combined process were14.33to18.99mg/L,4.41to12.75mg/L,0.19to0.24mg/L.The effluent quality of COD, TN, TP achieved the entertainment landscape water dischargestandards in the city sewage recycling landscape and environmental water quality.Factors influence were hydraulic load, temperature,influent concentration, and influent load.With the increasing of hydraulic loading, the average removal rate of COD, TP were decreased,while the average removal rate of TN and NH+4-N were increased first and then decreased.Considering the removal effect of nitrogen and phosphorus and energy consumption, the optimaloperation conditions was determined as follows: the influent flow is1.6m/d. Under this conditions,the average removal efficiencies for COD, TN, NH4+-N,TP were46.4%,53.0%,53.1%,56.3%. Byrepairing effect comparison in summer and autumn and winter conditions, indicate that thetemperature effect on TN,NH3-N removal effect is larger, COD followed, had no obvious effect onTP. Along with the increase of influent concentration and load, COD, TN, TP, removal rate is on therise. Which influent concentration had a greater influence on COD, TN, smaller influence on TP,and the influent load had great effect on COD, has little effect on TN, TP.Through comparison of the repair effect of plant and the blank wetland systems and differentplant wetland system, the results indicate that the presence of plants enhanced wetland removal COD,TN, NH3-N.Calamus wetland system on the average removal rate on COD,TN, NH3-N,TP were38.2%~47.9%,42.3%~53.0%,40.1%~55.8%,41.4%~59.1%, and cattail wetland system are33.0%~46.8%、37.5%~46.5%、37.7%~50.5%,39.6%~57.3%respectively.