Abstract
Abstract
In order to avoid the secondary pollution caused by the withering of plants, experiments on reasonable harvesting time of emerged plants in the constructed wetland (CWs) was conducted. The results showed that the best plant regrowth and nutrients removal efficiency by harvested plant were happened when plants were harvested at the withering period (January). Whenever plants were harvested, the removal amount of nitrogen and phosphorus in the CWs was greater than that in the non-harvesting CWs. When plants were harvested at the early growing period, the removal of nitrogen and phosphorus by the CWs reached the maximum, which were 92.39 mg·L−1 and 237.17 mg·L−1, respectively. Therefore, based on the plant regrowth and nutrient removal efficiency of the CWs, it is suggested to harvest emerged plants after the growth period (preferably the withering period), which will be most conductive to the long-term effective operation of the CWs.