A3s Enviro BOD & Nitrogen Removal


  • Wetlands can be less expensive to build than other treatment options .
  •  Operation and maintenance expenses (energy and supplies) are low
  •  operation and maintenance require only periodic, rather than continuous, on-site labor .
  •  Wetlands are able to tolerate fluctuations in flow .
  • they facilitate water reuse and recycling. In addition:
  •  they provide habitat for many wetland organisms
  •  they can be built to fit harmoniously into the landscape

A constructed wetland is a shallow basin filled with some sort of substrate, usually soil or gravel, and planted with vegetation tolerant of saturated conditions. Water is introduced at one end and flows over the surface or through the substrate, and is discharged at the other end through a weir or other structure which controls the depth of the water in the wetland.

  • settling of suspended particulate matter
  • filtration and chemical precipitation through contact of the water with the substrate and litter
  • chemical transformation
  • adsorption and ion exchange on the surfaces of plants, substrate, sediment, and litter
  • breakdown and transformation of pollutants by microorganisms and plants
  • uptake and transformation of nutrients by microorganisms and plants

predation and natural die-off of pathogens


  • Residential Complex
  • Offices
  • Shopping Malls
  • Domestic  Sewage less than 1 MLD
  • Pond  Treatment , Fishing Water
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