人工湿地对北方城市污水深度处理效果的研究

采用三级串联人工湿地试验装置以及无芦苇的空白对照装置在户外自然条件下进行试验,分阶段考察该组合式人工湿地系统对实际城市污水的深度处理效果.第一阶段为装置初运行阶段,采用较长的停留时间,该阶段装置对COD、TN、NH3-N、NO2--N和TP的去除率分别为75%、75%、95%、75%和50%.芦苇的存在使以上各指标相对于空白对照分别提高了10%、40%,20%、20%和50%;第二阶段采用较短的停留时间,该阶段装置对COD、TN、NH3-N、NO2--N和TP的去除率分别为85%、75%、100%、70%和98%,芦苇的存在使以上各指标相对于空白对照分别提高了10%、20%、35%、25%和63%.试验结果表明,该试验装置对城市污水具有较好的深度处理效果,能够有效降低水中的N和P,对改善水质、恢复生态系统和控制水体富营养化问题具有重要意义.

Investigation of urban sewage advanced treatment by combined constructed wetland device in northern China

In this paper, both a three-grades series constructed wetland device and control device were investigated under natural conditions, and the disposal effects of these device on the actual urban sewage treatment had been studied in phases. The retention time of the first grade with early operate phase, was Very long. The COD, TN, ammonia, sub-nitrogen and TP removal ability were 750%, 75 %, 95 %, 75 % and 50 % respectively, which were 10 %, 40%, 20%, 20% and 50%higher compared with the blank control device. Contrary to the first stage, the residence time of the second stage were short, and the COD, TN, ammonia, sub-nitrogen and TP removed at 85%, 75%, 100%,70 % and 98 % respectively. The existence of these plants enhanced the removal effect by 10%, 20%, 35 %, 25 % and 63% respectively. The results claimed that the test device had good effect on urban sewage advanced treatment, especially in reducing N, P content. The experiment had great significant in improving water quality, restoring ecosystems and control of water eutrophication problem.