2009•Polish Journal of Environmental StudiesRequires access
COD, TN and TP removal of Typha wetland vegetation of different structures.
Jing Debing, Z. Lianbi, Yin Xiao-song, Hong Jianming, Z. Mengbin, Yuzhong Wang
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Abstract
The diversity of aquatic macrophytes plays an important role in wastewater purification. To optimize poly-culture vegetation structure, Typha-Phragmites-Scirpus (with T. angustata, P. communis, S. validus as major species) vegetation, Typha-main (with T. angustata as major species) vegetation and Typha-monoculture vegetation as three design treatments were planted in pilot-scale gravel-based subsurface wetlands to treat artificial sewage. The Typha vegetation depicted had high COD, TN and TP removal loads in wetlands when low pollution load was treated, Typha-Phragmites-Scirpus vegetation had COD, TP and TN removal loads of 0.517 g m -2 d -1 , 0.277 g P m -2 d -1 and 0.023 g N m -2 d -1 in autumn. A Partial Correlations Analysis showed that COD removal loads significantly and positively correlated with plant species and stem density in either pilot scale or medium-sized (430 m 2 in area) constructed wetland. The N, P amounts in the above-ground tissue are