Matos Mateus Pimentel, Barreto André Baxter, Vasconcellos Gabriel Rodrigues, Matos Antonio Teixeira, Simões Gustavo Ferreira, von Sperling Marcos
Federal University of Lavras, Lavras, Minas Gerais, Brazil E-mail:
Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Water Sci Technol. 2017 Oct;76(7-8):1666-1675. doi: 10.2166/wst.2017.340.
Despite the fact that several authors consider the available measurement methods of hydraulic conductivity (k) suitable for a good representation of the bed condition and clogging potential in horizontal subsurface flow constructed wetlands, others have questioned their adequacy. In this work, hydraulic conductivity measurements with conventional and modified methods were undertaken in two small full-scale units, one planted with cattail (Typha latifolia) and the other unplanted. Both units had already been operating for seven years and showed a high degree of clogging. It was observed that the use of the falling head method, with the introduction of the tubes during the test, provided results without a clear spatial trend. On the other hand, tests done on monitoring wells inserted during construction time showed, as expected, k increasing with the horizontal distance from the inlet, but without reflecting actual field conditions. It was observed that, as the bed became more clogged, the use of the reported methods became more complex, suggesting the need of other methodologies. The use of planted fixed reactors (removable baskets installed in the bed) with evaluation of k at constant head in the laboratory showed potential for the characterization of the hydrodynamic properties of the porous medium.
尽管有几位作者认为现有的水力传导率（k）测量方法适用于很好地表示水平潜流人工湿地的床体状况和堵塞潜力，但也有其他人质疑其充分性。在这项工作中，在两个小型全尺寸单元中采用常规方法和改进方法进行了水力传导率测量，一个单元种植了香蒲（宽叶香蒲），另一个未种植。两个单元都已经运行了七年，并且显示出高度堵塞。观察到，在测试期间引入管子的情况下使用常水头试验法，得到的结果没有明显的空间趋势。另一方面，对施工期间插入的监测井进行的测试表明，正如预期的那样，k值随着离进水口的水平距离增加，但没有反映实际现场情况。观察到，随着床体堵塞加剧，使用所报道的方法变得更加复杂，这表明需要其他方法。在实验室中使用种植固定反应器（安装在床体中的可移动篮子）并在恒定水头下评估k值，显示出表征多孔介质水动力特性的潜力。
