Effectiveness of Constructed Wetland Plants in Filtering Pollutants

There are many case studies of vertical flow constructed wetlands. However, issues of effectiveness of the vertical flow constructed wetland plants in filtering pollutants needs to be addressed. In the current experiment, three plant species are discussed. The results show that among the three chosen plant species, Juncus effuses was more effective in removing pollutants than Canna generalis and Typha angustifolia. The accumulation of organic matter in the root system of Juncus effuses was up to 3.264mg/g. During the course of the experiment, the nitrifying in the constructed wetlands was intense. Ammonia nitrogen was transformed into nitrate nitrogen, which led to the increase in nitrate nitrogen. The transferring of ammonia nitrogen and nitrate nitrogen in multi-media system consisted of wastewater, substrate and plant roots. Nitrifying and denitrifying in the system coexisted, and Ammonia nitrogen and nitrate nitrogen transferred from one to the other.