垂直流人工湿地中污染物昼夜及沿程变化规律  

Diurnal and spatial variations of pollutants in vertical flow constructed wetland

作　　者：高敏[1] 朱伟[1,2] 董婵[1] 赵联芳[1] 

机构地区：[1]河海大学环境学院,江苏南京210098 [2]水资源高效利用与工程安全国家工程研究中心,江苏南京210098

出　　处：《水资源保护》2010年第2期49-52,共4页Water Resources Protection

基　　金：国家自然科学基金(50979028);水利部公益项目(200801065)

摘　　要：利用垂直潜流人工湿地单元模型探讨COD、TN和NH4+-N质量浓度在一昼夜之中随时间及深度的变化规律。结果表明:垂直潜流人工湿地中污染物去除率的变化呈一定的周期性,昼夜差距较大。COD、NH4+-N和TN的去除率在15:00达到最大,夜间最小。COD和NH4+-N质量浓度在表层(距湿地底部60～90cm段)迅速降低,底部变化幅度较小。TN浓度沿程的降低趋势很明显。湿地中COD、NH4+-N和TN质量浓度的变化趋势与DO显著相关,DO质量浓度越高,越有利于有机物和氮的去除。The patterns of variations of COD, TN and NH4＋ -N concentrations with time and space during one day and night were studied in a laboratory-scale vertical flow constructed wetland. The results showed that the removal rate of pollutants had a certain periodicity, and that there was a large difference between day and night. The highest removal rate of COD, NH4＋ -N and TN appeared at 15：00, and the lowest appeared at night. COD and NH3＋-N decreased rapidly in the upper part of the wetland （60 - 90 em above the bottom）, and varied slightly in the middle and lower part. TN decreased significantly along the course of the wetland. The changing trend of COD, TN and NH4＋ -N concentrations was significantly correlated with DO： the higher the DO concentration was in the wetland, the more beneficial DO was to the removal rates of organics and nitrogen.

关 键 词：垂直流人工湿地 日变化 沿程变化 有机物 氮 DO 

分 类 号：X703[环境科学与工程—环境工程]