脉冲垂直流人工湿地处理污染河水的试验研究

将脉冲布水引入垂直流人工湿地,考察了其与普通垂直流人工湿地对受污染河水处理效果的差异。结果表明,在水力负荷为0.6 m3/(m2.d)下,脉冲布水明显提高了人工湿地系统的复氧效果,普通垂直流人工湿地一级出水DO为零,而脉冲垂直流人工湿地一级出水DO平均为0.5 mg/L;两者对COD和TP的去除效果相当,脉冲和普通垂直流人工湿地对COD的去除率分别为59.2%和58.4%,对TP的去除率分别为83.6%和83.4%;但脉冲垂直流人工湿地对NH3-N和TN的去除效果优于普通垂直流人工湿地,脉冲垂直流人工湿地及其第一级湿地对NH3-N的去除率分别为38%和30%,对TN的去除率分别为40%和26.3%,而普通垂直流人工湿地及其第一级湿地对NH3-N的去除率分别为31.6%和22.1%,对TN的去除率分别为33.2%和23.9%。

Treatment of Polluted River Water by Pulse-feed Vertical-flow Constructed Wetland

The different efficiencies of treating polluted river water between pulse-feed vertical-flow constructed wetland and conventional vertical-flow constructed wetland were investigated.The results show that at the hydraulic load of 0.6 m~3/(m~2·d), the pulse feed can improve the DO in the vertical-flow constructed wetland.The DO in the first stage of conventional vertical-flow constructed wetland is 0, but that in the first stage of pulse-feed vertical-flow constructed wetland is 0.5 mg,/L.The removal rates of COD and TP are almost the same in two types of constructed wetlands.The removal rates of COD by pulse-feed and conventional vertical-flow constructed wetlands are 59.2% and 58.4%, and the removal rates of TP are 83.6% and 83.4% respectively.But the pulse-feed vertical-flow constructed wetland is better than conventional vertical-flow constructed wetland in the removal of NH_3-N and TN.The remov-al rates of NH_3 -N by the pulse-feed vertical-flow constructed wetland and its first stage are 38% and 30%, and the removal rates of TN are 40% and 26.3% respectively.While the removal rates of NH_3 -N by the conventional vertical-flow constructed wetland and its first stage are 31.6% and 22.1%, and the removal rates of tin are 33.2% and 23.9% respectively.