Effect of Different Carbon Source Additives on Nitrogen Removal Efficiency of Surface Flow Artificial Wetland Wastewater
In order to enhance the denitrification efficiency of artificial wetlands,this study takes the surface flow artificial wetland system as the object,and selects Triarrhena lutarioripari,Canna indica,and Corn cobs as external carbon source denitrification materials.The study explores the impact of different carbon source materials at 1,1.5 and 2 g/L under the same influent concentration on the denitrification efficiency of the system.The experimental results showed that the efficiency of removing NO3--N in the experimental group of three denitrification materials was significantly higher than that in the control group.In the early stage of system operation,the average removal rate of NO3--N in the experimental group was as high as 99.5%;The concentrations of organic carbon,ammonium nitrogen,nitrate nitrogen,and total nitrogen in the effluent of the experimental group were all lower than their influent concentrations,and there was no deterioration in water quality.Moreover,during the stable period,the total nitrogen concentration in the experimental group was significantly lower than that in the control group,indicating that the three plants can be used as external carbon source denitrification materials.1,1 and 1.5 g/L were the optimal addition amounts for T.lutarioripari,C.indica,and C.cobs,respectively.The TN concentration in wastewater was reduced to(4.50±0.10),(3.75±0.29)and(2.28±0.27)mg/L,respectively.The TN removal rates could reach 64.0%,70.0%,and 81.8%,respectively.Adding appropriate amounts of wetland plant carbon sources is beneficial for improving the nitrogen removal efficiency of surface flow constructed wetlands.
万方数据
维普
