Purification Efficiency of Micro-polluted River Water by Horizontal Subsurface-flow Constructed Wetland with Arundo Donax
In order to investigate the purification efficiency of micro-polluted river water in small southwestern cities and towns by constructed wetlands, two horizontal subsurface-flow constructed wetlands with and without Arundo donax were constructed. The results showed that when the inflow was 0. 75 m /d, and the hydraulic retention time was 2 d, the average removal rates of CODMn, TN, NH4+ - N and TP were 34. 1% , 63. 5% , 73. 4% and 70. 7% in the wetland with Arundo donax, and were 22. 2% , 32. 7% , 52. 2% and 36. 6% in the unplanted wetland. The existence of Arundo donax in wetland could improve the purification efficiency of the micro-polluted river water.
Arundo donaxhorizontal subsurface-flow constructed wetlandmicro-polluted river waterpurification efficiency