Role of Plants in a Constructed Wetland: Current and New Perspectives

The role of plants in the treatment of effluents by constructed wetland (CW) systems is under debate. Here, we review ways in which plants can affect CW processes and suggest two novel functions for plants in CWs. The first is salt phytoremediation by halophytes. We have strong evidence that halophytic plants can reduce wastewater salinity by accumulating salts in their tissues. Our studies have shown that Bassia indica, a halophytic annual, is capable of salt phytoremediation, accumulating sodium to up to 10% of its dry weight. The second novel use of plants in CWs is as phytoindicators of water quality. We demonstrate that accumulation of H2O2, a marker for plant stress, is reduced in the in successive treatment stages, where water quality is improved. It is recommended that monitoring and management of CWs consider the potential of plants as phytoremediators and phytoindicators.

[1]  C. Metcalfe,et al.  Feasibility of using ornamental plants (Zantedeschia aethiopica) in subsurface flow treatment wetlands to remove nitrogen, chemical oxygen demand and nonylphenol ethoxylate surfactants—a laboratory-scale study , 2003 .

[2]  K. Venkatesan,et al.  Restoration of saline land by halophytes for Indian soils , 2007 .

[3]  Gunther Geller,et al.  Horizontal subsurface flow systems in the German speaking countries: summary of long-term scientific and practical experiences; recommendations , 1997 .

[4]  S. Haslam.  Community Regulation in Phragmites Communis Trin.: II. Mixed Stands , 1971 .

[5]  Jan Vymazal,et al.  Plants used in constructed wetlands with horizontal subsurface flow: a review , 2011, Hydrobiologia.

[6]  Poul Harremoës.  Integrated water and waste management , 1997 .

[7]  W. Armstrong,et al.  Measuring and interpreting respiratory critical oxygen pressures in roots. , 2009, Annals of botany.

[8]  J. Kalff,et al.  Water Flow and Clay Retention in Submerged Macrophyte Beds , 1992 .

[9]  Influence of hybrid giant Napier grass on salt and nutrient distributions with depth in a saline soil , 2012, Biodegradation.

[10]  Mark S. Coyne,et al.  Vegetation effects on fecal bacteria, BOD, and suspended solid removal in constructed wetlands treating domestic wastewater , 2003 .

[11]  J. Hancock,et al.  Hydrogen peroxide signalling. , 2002, Current opinion in plant biology.

[12]  Takao Suzuki,et al.  Removal of nitrogen, phosphorus and COD from waste water using sand filtration system with Phragmites Australis , 1987 .

[13]  W. Armstrong.  Aeration in Higher Plants , 1980 .

[14]  B. Sorrell,et al.  Biogeochemistry of billabong sediments. II. Seasonal variations in methane production , 1992 .

[15]  Robert H. Kadlec,et al.  The Use of Treatment Wetlands for Petroleum Industry Effluents , 1999 .

[16]  Miklas Scholz,et al.  What is the role of Phragmites australis in experimental constructed wetland filters treating urban runoff , 2007 .

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

[18]  S. Rachmilevitch,et al.  Physiological parameters of plants as indicators of water quality in a constructed wetland , 2011, Environmental science and pollution research international.

[19]  A. Kivaisi.  The potential for constructed wetlands for wastewater treatment and reuse in developing countries: a review , 2001 .

[20]  W. Armstrong,et al.  Light-enhanced convective throughflow increases oxygenation in rhizomes and rhizosphere of Phragmites australis (Cav.) Trin. ex Steud. , 1990, The New phytologist.

[21]  W. H. Patrick,et al.  Nitrification‐denitrification at the plant root‐sediment interface in wetlands , 1989 .

[22]  K. Seidel.  Abbau von Bacterium coli durch höhere Wasserpflanzen , 2004, Naturwissenschaften.

[23]  Sara Hallin,et al.  Structure and function of denitrifying and nitrifying bacterial communities in relation to the plant species in a constructed wetland. , 2009, FEMS microbiology ecology.

[24]  Fabio Masi,et al.  Constructed wetlands for the Mediterranean countries: hybrid systems for water reuse and sustainable sanitation , 2007 .

[25]  J. Vymazal.  Constructed wetlands for wastewater treatment , 2010 .

[26]  Ilya Raskin,et al.  Phytoremediation: A Novel Strategy for the Removal of Toxic Metals from the Environment Using Plants , 1995, Bio/Technology.

[27]  J. Heijnen,et al.  pH: Keyfactor in the Biological Phosphorus Removal Process , 1994 .

[28]  B. Welz.  Atomic absorption spectrometry , 1985 .

[29]  K. Seidel,et al.  Macrophytes and water purification , 1976 .

[30]  I. Ungar,et al.  Germination and establishment of halophytes on brine-affected soils , 2002 .

[31]  H. Shaer.  Halophytes and salt-tolerant plants as potential forage for ruminants in the Near East region. , 2010 .

[32]  A THERMAL ANALYSIS OF A SUB-SURFACE , VERTICAL FLOW CONSTRUCTED WETLAND , 1997 .

[33]  David Steer,et al.  A test of four plant species to reduce total nitrogen and total phosphorus from soil leachate in subsurface wetland microcosms. , 2004, Bioresource technology.

[34]  William J. Mitsch,et al.  Constructed Wetlands for Wastewater Treatment: Municipal, Industrial, and Agricultural , 1990 .

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

[36]  G Langergraber,et al.  The role of plant uptake on the removal of organic matter and nutrients in subsurface flow constructed wetlands: a simulation study. , 2005, Water science and technology : a journal of the International Association on Water Pollution Research.

[37]  O. Stein,et al.  Temperature, Plants, and Oxygen: How Does Season Affect Constructed Wetland Performance? , 2005, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[38]  Chris C. Tanner,et al.  Effect of loading rate and planting on treatment of dairy farm wastewaters in constructed wetlands—II. Removal of nitrogen and phosphorus , 1995 .

[39]  P Kuschk,et al.  Root stimulated nitrogen removal: only a local effect or important for water treatment? , 2005, Water science and technology : a journal of the International Association on Water Pollution Research.

[40]  T. Hurek,et al.  Radial gas diffusion from roots of rice (Oryza sativa L.) and Kallar grass (Leptochloa fusca L. Kunth), and effects of inoculation withAzospirillum brasilense Cd , 1990, Plant and Soil.

[41]  Günter Langergraber,et al.  Modeling Variably Saturated Water Flow and Multicomponent Reactive Transport in Constructed Wetlands , 2005 .

[42]  Attilio Toscano,et al.  Evaluation of Phragmites australis (Cav.) Trin. evapotranspiration in Northern and Southern Italy , 2011 .

[43]  J. Brisson,et al.  Maximizing pollutant removal in constructed wetlands: should we pay more attention to macrophyte species selection? , 2009, The Science of the total environment.

[44]  Saravanamuthu Vigneswaran,et al.  Constructed Wetlands for Wastewater Treatment , 2001 .

[45]  H. Brix.  Do macrophytes play a role in constructed treatment wetlands , 1997 .

[46]  Simon A. Levin,et al.  Limitations of Laboratory Bioassays: The Need for Ecosystem-Level Testing , 1985 .

[47]  S. Rachmilevitch,et al.  The use of Bassia indica for salt phytoremediation in constructed wetlands. , 2012, Water research.

[48]  Andrew Wood,et al.  Constructed wetlands in water pollution control: Fundamentals to their understanding , 1995 .

[49]  S. Haslam.  Community Regulation in Phragmites Communis Trin.: I. Monodominant Stands , 1971 .

[50]  J. Weis,et al.  Metal uptake, transport and release by wetland plants: implications for phytoremediation and restoration. , 2004, Environment international.

[51]  J. Headley,et al.  Technical Note: Seeding Conditions of the Halophyte Atriplex Patula for Optimal Growth on a Salt Impacted Site , 2011, International journal of phytoremediation.

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

[53]  Edward P. Glenn,et al.  Halophytes for the treatment of saline aquaculture effluent , 1999 .

[54]  Charles R. Goldman,et al.  Role of aquatic plants in wastewater treatment by artificial wetlands. , 1986 .

[55]  M. Drew,et al.  Larger adenylate energy charge and ATP/ADP ratios in aerenchymatous roots of Zea mays in anaerobic media as a consequence of improved internal oxygen transport , 1985, Planta.

[56]  K. Zhao,et al.  Desalinization of saline soils by Suaeda salsa , 1991, Plant and Soil.

[57]  Y. Comeau,et al.  Treatment of freshwater fish farm effluent using constructed wetlands: the role of plants and substrate. , 2003, Water science and technology : a journal of the International Association on Water Pollution Research.

[58]  Kurth Perttu,et al.  Willow vegetation filters for wastewater treatment and soil remediation combined with biomass production , 2001 .

[59]  C. Abdelly,et al.  Evaluation of the capacity of three halophytes to desalinize their rhizosphere as grown on saline soils under nonleaching conditions. , 2009 .

[60]  M. Kästner,et al.  Removal of bacteria by filtration in planted and non-planted sand columns. , 2007, Water research.

[61]  L. Bengtsson,et al.  Wetland systems to control urban runoff , 2007 .

[62]  Stephen R. Carpenter,et al.  Sediment interactions with submersed macrophyte growth and community dynamics , 1991 .

[63]  Donald A. Hammer,et al.  Constructed Wetlands for Wastewater Treatment , 2020 .

[64]  H Brix,et al.  Zero-discharge of nutrients and water in a willow dominated constructed wetland. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[65]  N. Lazarovitch,et al.  Root halotropism: Salinity effects on Bassia indica root , 2010 .

[66]  K. R. Reddy,et al.  Constructed wetlands for wastewater treatment in Europe. , 2005 .

[67]  Amit Gross,et al.  A recirculating vertical flow constructed wetland for the treatment of domestic wastewater. , 2009 .

[68]  C. Tanner,et al.  Plants as ecosystem engineers in subsurface-flow treatment wetlands. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[69]  T. Headley,et al.  Evapotranspiration from subsurface horizontal flow wetlands planted with Phragmites australis in sub-tropical Australia. , 2012, Water research.

[70]  P Kuschk,et al.  Effects of plants and microorganisms in constructed wetlands for wastewater treatment. , 2003, Biotechnology advances.

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

[72]  S. Wolff.  [18] Ferrous ion oxidation in presence of ferric ion indicator xylenol orange for measurement of hydroperoxides , 1994 .

[73]  David Turner,et al.  Oxygen Distribution in Wetland Plant Roots and Permeability Barriers to Gas-exchange with the Rhizosphere: a Microelectrode and Modelling Study with Phragmites australis , 2000 .

[74]  C. Martius,et al.  Reducing topsoil salinity and raising carbon stocks through afforestation in Khorezm, Uzbekistan , 2011 .

[75]  António Albuquerque,et al.  The influence of plants on nitrogen removal from landfill leachate in discontinuous batch shallow constructed wetland with recirculating subsurface horizontal flow , 2012 .

[76]  M. Schmidt,et al.  BIOLOGICAL ASSESSMENT OF AQUATIC POLLUTION: A REVIEW, WITH EMPHASIS ON PLANTS AS BIOMONITORS * , 1994, Biological reviews of the Cambridge Philosophical Society.

[77]  Ü. Mander,et al.  Dynamics of Typha latifolia L. populations in treatment wetlands in Estonia , 2009 .

[78]  Kevin L. Davies,et al.  Role of wetland plants in the diurnal control of CH4 and CO2 fluxes in peat , 1996 .

[79]  J. Květ,et al.  Response ofPhragmites australis, Glyceria maxima, andTypha latifolia to additions of piggery sewage in a flooded sand culture , 1996, Wetlands Ecology and Management.

[80]  J. Cheeseman.  Hydrogen Peroxide and Plant Stress: A Challenging Relationship , 2007 .

[81]  J. Anda,et al.  Treatment of domestic wastewater and production of commercial flowers in vertical and horizontal subsurface-flow constructed wetlands , 2009 .

[82]  S. McGrath,et al.  Comparison of three wet digestion methods for the determination of plant sulphur by inductively coupled plasma atomic emission spectroscopy (ICP‐AES) , 1994 .

[83]  B. El Hamouri,et al.  Subsurface-horizontal flow constructed wetland for sewage treatment under Moroccan climate conditions , 2007 .

[84]  Ralph Smith,et al.  Limnology—Inland water ecosystems , 2002, Journal of the North American Benthological Society.

[85]  P. Randerson,et al.  Diurnal cycling of dissolved gas concentrations in a willow vegetation filter treating landfill leachate , 2010 .

[86]  P. Schröder,et al.  Establishment of a constructed wetland in extreme dryland , 2009, Environmental science and pollution research international.

[87]  Minimizing land requirement and evaporation in small wastewater treatment systems , 2006 .