潜流型人工湿地低温域脱氮效果研究

由于受低温和植物休眠的影响,人工湿地在冬季运行时脱氮率明显下降,而通过在人工湿地的植物表面覆盖保温材料,可有效提高湿地内温度,防止了结冰并减缓了植物休眠;通过控制湿地水力条件和运行方式,可提高湿地系统的温度和溶解氧值,促进NH4 -N的正常硝化;当水力负荷为0.5~15cm/d时,湿地对TN的去除率可达68%。

Denitrification by Using Subsurface Constructed Wetland in Low Temperature

The constructed wetland is affected by low temperature and plant dormancy, and the rate of denitrification is decreased remarkably in winter. However, coverage of thermal insulation material on the wetland plant can raise temperature in the wetland, so as to avoid the icing and mitigate the plant dormancy. By means of controlling the hydraulic condition and operating mode of the wetland, the temperature and dissolved oxygen value can be upgraded so as to promote the normal nitrification of NH~ _4-N. When the hydraulic load is 0.5-15 cm/d, the removal rate of wetland for TN can be up to 68%.