Plants of Constructed Wetland Wastewater Treatment Systems: A Comparison of the Oxygen Release from Roots of Typha and Phragmite

Abstract

Constructed wetlands have recently been widely used around the world to purify wastewater. As an important component of constructed wetland system, plants improve water quality by increasing oxygen concentrations in the rhizosphere. However, little was known about the ability of oxygen release from roots with different species. And the reason of the difference is still unclear. This paper investigated the variation of oxygen release rate from roots ofTyphaandphragmiteusing a titanium (Ш) citrate buffer. Compared the ability of oxygen release fromTyphaandphragmite. The results shows that oxygen release rates with the same condition were higher forPhragmites. This difference is caused by the special structure ofPhragmites. The aerenchyma ofPhragmitesis good at the oxygen transport. The results of this paper can help us to choose better vegetation species for wastewater treatment.