ABSTRACT

A vertical-flow unit containing four filters filled with shale was used to study the removal of phosphorous, nitrogen and organic matter of an urban residual wastewater during a period of 90 days. The influence of both the shale granulometry and the plant density of Panicum Maximum were studied. The decrease of the shale granulometry led to a significant improvement of all the measured parameters, while the presence of plants did only influence the phosphate retention with a lower extent. By comparing the results to previous studies, we hypothesised that the effect of the root system of Panicum maximum would be different depending on the size and the depth of the reactors. For practical application, adjusting the material granulometry was proposed to be the most important parameter for improving the filtration efficiency. Concomitantly, adjusting the plant density helps to control the clogging percentage of the filters.

摘要

包含四个填充页岩的过滤器的垂直流装置用于研究在 90 天的时间内去除城市残余废水中的磷、氮和有机物。研究了页岩粒度和大蕉植株密度的影响。页岩粒度的降低导致所有测量参数的显着改善，而植物的存在仅在较低程度上影响磷酸盐保留。通过将结果与之前的研究进行比较，我们假设Panicum maximum根系的影响将根据反应堆的大小和深度而有所不同。对于实际应用，调整材料粒度被认为是提高过滤效率的最重要参数。同时，调整植物密度有助于控制过滤器的堵塞百分比。