COD, TN and TP Removal of Typha Wetland Vegetation of Different Structures
J. Debing1,2, Z. Lianbi3, Y. Xiaosong3, H. Jianming1, Z. Mengbin2, W. Yuzhong2
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1College of Life Science, Capital Normal University, Beijing 100048, China
2Beijing Glorious Land Agricultural Co., LTD branch of enterprise postdoctoral workstation of Zhongguancun (Haidian) Science Park, Beijing 100049, China
3Beijing General Research Institute of Mining and Metallurgy, Beijing 10044, China
Pol. J. Environ. Stud. 2009;18(2):183–190
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 m2 in area) constructed wetland. The N, P amounts in the above-ground tissue are only 3.5~11.1 g N m-2 yr-1 and 1.3~13.5 g P m-2 yr-1 in medium-sized and pilot scale wetlands, because both biomass and N, P contents of wetland vegetation harvested in late autumn were low. Thus, it is important for constructed wetlands to optimize poly-culture vegetation structure to improve treatment efficiency. Generally, the poly-culture wetlands vegetation of T. angustata, P. communis, S. validus, Z. latifolia, Acorus calamus with stem densities of 23 stem m-2, 194 stem m-2, 112 stem m-2, 26 stem m-2, 42 stem m-2 could gain excellent removal efficiency.