Nutrient removals by 21 aquatic plants for vertical free surface-flow (VFS) constructed wetland

Abstract An attempt was made to investigate the removal of high nutrient contents from polluted water. This study focused on the comparisons between nitrogen and phosphorus removal rates by area-based calculation and biomass-based calculation using various kinds of aquatic plants (18 emergent and 3 floating plants). Results showed that all floating plants performed maximum nutrient removal rates based on plant weight calculation while most emergent plants performed maximum nutrient removal rates based on planted area calculation. The reason is that the weights of rooted mass by emergent plants are heavier than their shoots, resulting to low nutrient removal efficiencies in terms of their total weight. The study suggests that the planted area and the plant's geometries (such as roots and shoots) should be considered for the effective design in aquatic plant treatment systems.

[1]  Kim B. Jensen,et al.  Nitrification and denitrification in the rhizosphere of the aquatic macrophyte Lobelia dortmanna L. , 1997 .

[2]  Jos T. A. Verhoeven,et al.  Water and mass budgets of a vertical-flow constructed wetland used for wastewater treatment , 2003 .

[3]  Philippe Hinsinger,et al.  How Do Plant Roots Acquire Mineral Nutrients? Chemical Processes Involved in the Rhizosphere , 1998 .

[4]  S. Nelson,et al.  Managing vegetation in surface-flow wastewater-treatment wetlands for optimal treatment performance , 2005 .

[5]  Lena Gumaelius,et al.  A comparative study of Cyperus papyrus and Miscanthidium violaceum-based constructed wetlands for wastewater treatment in a tropical climate. , 2004, Water research.

[6]  D. Wise.  Bioremediation of Contaminated Soils , 2000 .

[7]  Olga Urbanc-Bercic,et al.  Investigation into the use of Constructed Reedbeds for Municipal Waste Dump Leachate Treatment , 1994 .

[8]  Gerald A. Moshiri,et al.  Constructed Wetlands for Water Quality Improvement , 1993 .

[9]  Mong-Na Lo Huang,et al.  Nutrient removal in gravel- and soil-based wetland microcosms with and without vegetation , 2001 .

[10]  C. Campbell,et al.  Constructed Wetlands in the Sustainable Landscape , 1999 .

[11]  J. R. Davis,et al.  Comprehensive approaches to eutrophication management: the Australian example , 1998 .

[12]  J. Skousen,et al.  Treatment of Domestic Wastewater by Three Plant Species in Constructed Wetlands , 2001 .

[13]  G. Mackie.  Applied Aquatic Ecosystem Concepts , 2000 .

[14]  H Brix,et al.  Phosphorus removal by sands for use as media in subsurface flow constructed reed beds. , 2001, Water research.

[15]  L. Akça,et al.  Treatment of wastewater by natural systems. , 2001, Environment international.

[16]  L. Baker,et al.  Nitrate removal in wetland microcosms , 1998 .

[17]  Jukka Laine,et al.  Vegetation is the main factor in nutrient retention in a constructed wetland buffer , 2004, Plant and Soil.

[18]  R. Gersberg,et al.  Nutrient removal efficiency and resource economics of vertical flow and horizontal flow constructed wetlands , 2001 .

[19]  R. J. Haynes,et al.  Active ion uptake and maintenance of cation-anion balance: A critical examination of their role in regulating rhizosphere pH , 1990, Plant and Soil.

[20]  Hans Brix,et al.  Functions of Macrophytes in Constructed Wetlands , 1994 .

[21]  F. Gilliam,et al.  Short-term changes in soil nutrients during wetland creation , 1998, Wetlands Ecology and Management.

[22]  D. S. Mitchell,et al.  Phosphorus removal rates in bucket size planted wetlands with a vertical hydraulic flow , 1998 .

[23]  R. Kadlec,et al.  The limits of phosphorus removal in wetlands , 1999, Wetlands Ecology and Management.

[24]  J. Ham,et al.  Seasonal Performance of Constructed Wetland and Winter Storage Pond for Sewage Treatment in Korea , 2004, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[25]  Ying‐Feng Lin,et al.  Effects of macrophytes and external carbon sources on nitrate removal from groundwater in constructed wetlands. , 2002, Environmental pollution.

[26]  A. Bezbaruah,et al.  pH, redox, and oxygen microprofiles in rhizosphere of bulrush (Scirpus validus) in a constructed wetland treating municipal wastewater , 2004, Biotechnology and bioengineering.

[27]  B. Gopal.  Natural and Constructed Wetlands for Wastewater Treatment: Potentials and Problems , 1999 .

[28]  M. Iijima,et al.  Regulation of rhizosphere acidification by photosynthetic activity in cowpea (Vigna unguiculata L. walp.) seedlings. , 2002, Annals of botany.

[29]  Chris C. Tanner,et al.  Plants for constructed wetland treatment systems — A comparison of the growth and nutrient uptake of eight emergent species , 1996 .