北方多级复合人工湿地在冬季低温条件下水质净化效果研究OA

To address the challenge of overwinter operation for large artificial wetlands in northern China,in this study the Heituwa constructed wetlands of Guanting Reservoir was examined using a"stable pond+constructed wetland"combination process,to investigate water purification under low-temperature conditions from 2008-2020,incorporating continuous inflow,operating under ice cover,and maintaining wetland macrophytes.Water from the Yongding River was found to meet Class Ⅲ surface water standards after treatment by the Heituwa constructed wetlands.Removal rates for TN,NH4+-N,BOD5,TP and orthophosphate were(30.84±25.74)％,(60.14±23.80)％,(36.84±32.16)％,(39.47±34.65)％,and(48.92±34.63)％respectively.The stabilization pond effectively degraded nitrogen and phosphorus nutrients,while the constructed wetland performed well removing NH4+-N,CODMn and BOD5.Different types of constructed wetlands had their own advantages,the purification effect in terms of water quality in constructed wetlands was as follows:subsurface flow wetland zone Ⅰ＞subsurface flow wetland zone Ⅳ＞surface flow wetland.The combination process of"stable pond+constructed wetland"exhibited significantly high pollutant removal efficiency under low temperature in winter,providing a reference for the construction and operation management of wetlands in northern China.