Study On Performance Of Constructed Wetland For Rural Sewage Treatment In Arid Area

We consider Urumqi country as a typical country in arid aera. Choose Pingxiliang sewage repair project. Optimization of constructed wetland technology, in order to popularization and application of constructed wetland technology in arid area. The result showed that:(1) The research and development of media filler in constructed wetland in arid area.The utilizing included a tiny view characteristic of material, the mineralcomponent, and adsorption, analysis and price etc. factors of the media filler performance evaluation method, choosing the system media. So the most function excellent had the Gray-brown desert soil and blast furnace slag.(2) The research of building aquatic plant system in constructed wetland in arid area.According to the species of aquatic plants in natural wetlands in Urumchi in arid area, this paper selected plants such as Phragmites communis, Canna generalis, Acorns calamus, Typha orientalis and Juncus effuses, researched on their abilities of removal pollutant in wastewater by experiment, selection 2-3 aquatic plant fit for growing in arid area to effectively remove pollutant in wastewater. Comprehensive consideration application of constructed wetland technology in arid area could mainly use Phragmites communis and Canna generalis, Acorns calamus.(3)The pilot test of operation of subsurface flow constructed wetland in the arid area.Building subsurface flow constructed wetland system at typical country named Pingxiliang in arid area between July 2005 to October 2006.The system of subsurface flow constructed wetland was studied in field for 15 months in arid area of China. The regulation of operating the system of subsurface flow constructed wetland all-years was studied first under the characteristic climate in arid area. Then the influence of HRT (hydraulic retention time) and harvest on wastewater purifying efficiency was studied.