Application of Pilot-Scale-Constructed Wetland as Tertiary Treatment System of Wastewater for Phosphorus and Nitrogen Removal

This paper presents the results of using a pilot-scale-constructed wetland as a tertiary system to simulate the treatment conditions of wastewater effluents from the metal-mechanical industry, aiming to achieve the Brazilian legal standards of phosphorus and nitrogen emission. The macrophytes were placed in 1 m3 polyethylene tanks, daily estimating the treatment of 2 m3 of effluents. The effluents were circulated in a horizontal subsurface flow through a porous matrix of thick sand and gravel, in which the roots of the macrophytes of the species Reed (Scirpus sp.) and Cattail (Typha sp.) were fixed. Monitoring of the pilot plant was performed through a battery of physical–chemical and biological analyses. Despite the load variations and operational problems, the system presented a positive degree of pollutant efficiency removal, especially for phosphorus (73% medium), TKN (61% medium), and NH4–N (56% medium). Peak results were achieved during the last 3 months of monitoring. The chemical analysis of the support layer, plus the root system and aerial portion of the plants, revealed that these wastes could be used as fertilizer.

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

[2]  B. Tunçsiper,et al.  Nitrogen removal in a combined vertical and horizontal subsurface-flow constructed wetland system , 2009 .

[3]  M. Kaseva,et al.  Performance of a sub-surface flow constructed wetland in polishing pre-treated wastewater-a tropical case study. , 2004, Water research.

[4]  Robert H. Kadlec,et al.  Chemical, physical and biological cycles in treatment wetlands , 1999 .

[5]  M. Beklioğlu,et al.  COMPARISON OF THE TREATMENT PERFORMANCES OF BLAST FURNACE SLAG-BASED AND GRAVEL-BASED VERTICAL FLOW WETLANDS OPERATED IDENTICALLY FOR DOMESTIC WASTEWATER TREATMENT IN TURKEY , 2005 .

[6]  Peter A Vanrolleghem,et al.  Model-based design of horizontal subsurface flow constructed treatment wetlands: a review. , 2004, Water research.

[7]  John S. Gulliver,et al.  Enhanced Sand Filtration for Storm Water Phosphorus Removal , 2006 .

[8]  R. Shutes,et al.  Reed beds and constructed wetlands for wastewater treatment , 1997 .

[9]  Jan Vymazal,et al.  The use constructed wetlands with horizontal sub-surface flow for various types of wastewater , 2009 .

[10]  Kenneth C. Stone,et al.  Improved nitrogen treatment by constructed wetlands receiving partially nitrified liquid swine manure , 2003 .

[11]  A. Camargo,et al.  Composição química de macrófitas aquáticas flutuantes utilizadas no tratamento de efluentes de aqüicultura , 2006 .

[12]  Chunming Hu,et al.  Phosphorus Removal Performance and Mechanisms of a Constructed Horizontal Subsurface Flow Wetlands Treating Reclaimed Water , 2009 .

[13]  S. V Matagi,et al.  A review of Heavy Metal Removal Mechanisms in wetlands , 1998 .

[14]  Raimund Haberl,et al.  Constructed wetlands for pollution control: Processes, performance, design and operation , 2000 .

[15]  C. Polprasert,et al.  Role of plant uptake on nitrogen removal in constructed wetlands located in the tropics , 1997 .

[16]  M. Maine,et al.  Influence of nitrogen species (NH4+ and NO3−) on the dynamics of P in water–sediment–Salvinia herzogii systems , 2003, Hydrobiologia.

[17]  J. Clausen,et al.  Seasonal performance of a wetland constructed to process dairy milkhouse wastewater in Connecticut , 1999 .

[18]  T. Jamieson,et al.  The use of aeration to enhance ammonia nitrogen removal in constructed wetlands , 2003 .

[19]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[20]  K. Sakadevan,et al.  Phosphate adsorption characteristics of soils, slags and zeolite to be used as substrates in constructed wetland systems , 1998 .

[21]  Y Q Zhao,et al.  Anti-sized reed bed system for animal wastewater treatment: a comparative study. , 2004, Water research.

[22]  Florent Chazarenc,et al.  Artificial aeration to increase pollutant removal efficiency of constructed wetlands in cold climate , 2006 .

[23]  Keith E. Dennett,et al.  Wetland Simulation Model for Nitrogen, Phosphorus, and Sediments Retention in Constructed Wetlands , 2007 .

[24]  Ronald L. Droste,et al.  Test of the first-order removal model for metal retention in a young constructed wetland , 2001 .

[25]  W. Mitsch,et al.  The role of vegetation in creating and restoring wetlands — An international perspective , 1995 .

[26]  Design recommendations for subsurface flow constructed wetlands for nitrification and denitrification , 1999 .