复合垂直流人工湿地微曝气条件优化研究

THE STUDY ON OPTIMIZATION OF MICRO AERATION CONDITIONS IN INTEGRATED VERTICAL FLOW CONSTRUCTED WETLAND

采用在复合垂直流人工湿地引入微曝气技术对城市污染河水进行处理,通过改变曝气深度(位置),曝气强度,曝气时间这3个曝气条件进行试验,以寻求系统最佳的微曝气条件。结果表明,在曝气强度为2.55 m3/h,曝气深度、位置为最前端的下行流池的底部,曝气时间为40 min这个曝气条件下,TN、TP和COD去除率高,均达到90%以上,NH4+-N的去除率达到70%以上,TN、NH4+-N和COD的出水均低于地表水环境质量标准(GB 3838-2002)Ⅰ类标准值,TP的出水质量浓度介于Ⅰ类和Ⅱ类标准值之间,所以此条件是最佳的微曝气条件。

Micro-aeration technology was introduced in the integrated vertical flow constructed to treat polluted urban river water,and the best micro aeration conditions were analyzed through experiments in the integrated vertical flow constructed wetland which the aeration conditions were changed,including aeration depth and position,aeration intensity and aeration time.The results showed that under the micro aeration conditions of which aeration intensity was 2.55 m3/h,aeration depth and position were at the bottom of most front-end down-flow chamber of IVCW and aeration time was 40 min,the removal rates of TN,TP and COD were all above 90%,and the removal rate of ammonium nitrogen reached more than 70%.The effluent concentration of TN,COD and ammonium nitrogen were lower than the Ⅰclass standard values of the surface water environment quality standard（GB 3838-2002）,and the effluent concentration of TP was between Ⅰand Ⅱclass standard values.So,the above mentioned micro aeration condition was the best.