构建湿地堵塞问题的研究

研究了复合垂直流构建湿地(IVCW)中与填料堵塞相关的填料粒径、渗透性能、有机质含量等因素的变化.经过颗粒分析得知填料粒径在2～5mm间,运用自制的砂样管对填料进行原位采样,渗透试验结果表明IVCW填料层的渗透系数随填料深度的增加而增加.IVCW填料各层中,渗透系数最小值存在于表层以下15～30cm处.IVCW系统运行52个月后,仅填料表面至15cm深处有少量有机质存在,15cm深度以下有机质含量极少,表明IVCW系统运行稳定,未出现堵塞现象.文中通过分析填料堵塞的影响因素提出相应的预防措施和对策.

Studies on Clogging of the Constructed Wetland

The parameters of substrate related to clogging, such as the grain size, the filtration rate and organic substance in the substrate, were investigated in the integrated vertical-flow constructed wetland (IVCW). The substrate of IVCW was collected by a specific sampling tube in situ and the infiltration experiment showed that the filtration rate of substrate increased with the depth of substrate and the minimum filtration rate existed 15-30 cm below the surface of substrate. The amount of organic substances in upper 15 cm layer of the substrate was limited and even less in deeper layer after fifty two-month running, and this revealed that IVCW was operating steadily and no clogging was observed. Considering the factors related to clogging, the strategy to prevent and recover the clogging phenomenon was put forward.