Characteristics of Water Purification in Constructed Wetlands and Their Influencing Factors in Lake Estuaries
The construction of artificial wetlands in the estuary area of lake significantly reduce the pollution load of river and lake.In this paper,we studied Nanfei river estuary to Shibalianwe lake in Anhui,analyzed the purification efficiency and influencing factors of the primary and tertiary constructed wetlands on the water quality(TN,TP,COD,NH4+-N,and NO3--N)of the Nanfei river.In 2022,the influent NH4+-N and TP of in the constructed wetland was higher than those in 2023,and the pH levels were relatively high in 2023.The single paddy constructed wetland did not effectively remove pollutants in 2022,but in 2023,it showed an average removal rate of 40.8%for pollutants except COD.The removal efficiencies of nitrogen,phosphorus,and COD by tertiary paddy constructed wetland in 2022(-81.3%～50.0%)were lower than in 2023(7.1%～93.2%).The tertiary multi-pond constructed wetlands had higher removal efficiencies of nitrogen and phosphorus in both 2022(71.45%)and 2023(74.18%)compared to the primary and tertiary paddy constructed wetlands.Water purification in the Shibalianwei constructed wetland was notably associated with EC,Eh,and DO in 2022,while the correlation with water quality indices was lower in 2023.Variations were observed in the removal effect of nitrogen and phosphorus among different levels of surface flow constructed wetlands in the lake's estuary,with tertiary constructed wetlands showing higher purification efficiency than the single,and submerged plant artificial wetlands in multi-ponds demonstrating superior performance compared to constructed paddy wetlands.
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