水力负荷与气水比对人工湿地净水效果的影响

Research on the Effect of Hydraulic Load and Gas Water Ratio on Wastewater Treatment of Constructed Wetland

以某高海拔地区污水处理厂的二级生化处理水为研究对象,通过对人工湿地进出水中COD、NH+4-N、TP浓度的变化,研究了水力负荷、气水比两个参数对人工湿地净水效果的影响。结果表明:人工湿地去除生活污水中COD、NH4+-N、TP的最佳水力负荷为0.33 m3/(m2·d)、气水比为3:1,在此最佳试验条件下,COD、NH4+-N、TP的去除率分别可达84%、69%、68%,出水水质满足《地表水环境质量标准》Ⅲ类水质标准。

Taking the secondary effluent of a wastewater treatment plant at high altitude as investigating subject,this paper studied the effect of hydraulic load and gas water ratio on the constructed wetland wastewater treatment by observing the influent and effluent water index,such as COD 、NH4＋-N and TP.The conclusions were as follows：the optimal hydraulic load and gas water ratio in the constructed wetland wastewater treatment were 0.33 m3/（m2· d） and 3：1,and the removal rate of COD 、NH4＋-N 、TP were 84% 、69% 、68%,respectively,of which the effluent can meet grade Ⅲ of Environmental Quality Standards for Surface Water.