An Shuqing

Comparison of Oenanthe javanica 's winter purification ability in constructed wetlands under sand and floating-bed cultures

To improve purification ability of wetland in cold winter and reveal the impact of culture methods of wetland plants, a pi⁃ lot⁃scale experiment was conducted to compare the performance of Oenanthe javanica using two culture methods, i.e. sand culture and floating⁃bed culture, in the purification of polluted water during winter. There existed significant different removal efficiency of total phosphorous (TP) and total nitrogen (TN) between various treatments. In the four studied batches, control check(CK), sand culture and floating⁃bed culture showed an average of 20.17% ±19.23% , 59.60% ±7.54% and 45.44% ±29.22% TP removal efficiency, and an average of 29.83% ±19.65% , 64.89% ±23.01% and 60.50% ±25.86% TN removal efficiency, respectively. Compared with CK, the results showed that the plantation of Oenanthe javanica could significantly improve TP and TN removal effi⁃ ciency in cold winter. Compared with floating⁃bed culture, sand culture had slightly higher removal ability for both TP and TN. But