Abstract This study investigated the effects of hydraulic load and intermittent aeration on matrix oxygen concentration, COD removal, NH4+-N removal, TN removal, TP removal, greenhouse gases (GHGs) emission and functional gene abundances in wastewater ecological soil infiltration systems (WESISs). Intermittent aeration created aerobic conditions above 40 cm depth and did not change anaerobic conditions below 70 cm depth, which enhanced the abundances of bacteria and functional genes related to organic matter and nitrogen removal and improved COD, NH4+-N, TN and TP removal compared with non-aeration. The pollutants removal efficiencies, CO2 conversion efficiency decreased and N2O conversion efficiency increased with hydraulic load increasing in the non-aeration WESIS. COD, NH4+-N, TP removal efficiencies and CO2 conversion efficiency decreased in the intermittent aeration WESIS when hydraulic load increased. As hydraulic load increased from 0.05 to 0.4 m/d, TN removal efficiency first increased and then decreased in the intermittent aeration WESIS. However, N2O conversion efficiency first decreased and then increased. Intermittent aeration WESIS achieved high removal efficiencies of 89.4%, 90.8%, 87.2%, 92.9% for COD, NH4+-N, TN, TP, high conversion efficiency of 92.8% for CO2 and low conversion efficiency of 0.19% for N2O at hydraulic load of 0.2 m/d. Intermittent aeration and hydraulic load had hardly any effects on CH4 emission.

中文翻译：

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水力负荷和间歇曝气如何影响废水生态土壤渗透系统中的污染物去除和温室气体排放？

摘要 本研究调查了水力负荷和间歇曝气对废水生态土壤渗透系统 (WESIS) 中基质氧浓度、COD 去除、NH4+-N 去除、TN 去除、TP 去除、温室气体 (GHGs) 排放和功能基因丰度的影响。 . 间歇曝气在40 cm深度以上创造了好氧条件，在70 cm深度以下不改变厌氧条件，提高了与有机物和脱氮相关的细菌和功能基因的丰度，提高了COD、NH4+-N、TN和TP的去除率。非曝气。在非曝气WESIS中，污染物去除效率、CO2转化效率和N2O转化效率随着水力负荷的增加而降低。COD、NH4+-N、当水力负荷增加时，间歇曝气 WESIS 中的 TP 去除效率和 CO2 转化效率降低。随着水力负荷从 0.05 增加到 0.4 m/d，在间歇曝气 WESIS 中，TN 去除效率先升高后降低。然而，N2O 的转化效率先下降后上升。间歇曝气WESIS实现了89.4%、90.8%、87.2%、92.9%的COD、NH4+-N、TN、TP的高去除率，CO2的92.8%的高转化率和水力负载下N2O的0.19%的低转化率0.2 米/天。间歇曝气和水力负荷对 CH4 排放几乎没有任何影响。在间歇曝气WESIS中TN去除效率先升高后降低。然而，N2O 的转化效率先下降后上升。间歇曝气WESIS实现了89.4%、90.8%、87.2%、92.9%的COD、NH4+-N、TN、TP的高去除率，CO2的92.8%的高转化率和N2O的0.19%的低转化率。 0.2 米/天。间歇曝气和水力负荷对 CH4 排放几乎没有任何影响。在间歇曝气WESIS中TN去除效率先升高后降低。然而，N2O 的转化效率先下降后上升。间歇曝气WESIS实现了89.4%、90.8%、87.2%、92.9%的COD、NH4+-N、TN、TP的高去除率，CO2的92.8%的高转化率和水力负载下N2O的0.19%的低转化率0.2 米/天。间歇曝气和水力负荷对 CH4 排放几乎没有任何影响。