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Constructed wetland management

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constructed wetland

Publicado en: Ingeniería
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Constructed wetland management

  1. 1. CONSTRUCTED WETLAND MANAGEMENT RISHABH RATHOR B110229CE 1
  2. 2. CONTENTS • What is a wetland? • Economic benefits • Types of wetlands • Components of wetlands • Working mechanism 2
  3. 3. WHAT IS A WETLAND? • A wetland is an area that is regularly saturated by surface water or groundwater and is characterized by a prevalence of vegetation that is adapted for life in saturated soil conditions (e.g., swamps, bogs, fens, marshes and estuaries).” 3
  4. 4. CONSTRUCTED WETLAND • Natural wastewater treatment systems • Used for secondary or tertiary treatment • Treatment processes – Filtration – Sedimentation – Biological degradation 4
  5. 5. BENEFITS • Improvement of drinking water quality • Flood control • Cleaning the water • Fisheries • Recreation • Wildlife habitat • Other benifits 5
  6. 6. TYPES OF WETLANDS • Surface flow or free water surface constructed wetland 6
  7. 7. TYPES OF WETLANDS • Subsurface horizontal flow constructed wetland 7
  8. 8. TYPES OF WETLANDS • Vertical flow constructed wetland 8
  9. 9. COMPONENTS OF WETLAND 9
  10. 10. COMPONENTS OF WETLAND • Waterproof basin – To avoid groundwater and soil contamination – To prevent infiltration of groundwater into the wetland bed – Layer of compacted clay – Plastic liners 10
  11. 11. COMPONENTS OF WETLAND • Filter media – Gravel (12-20mm) – 20-40mm at ends 11
  12. 12. COMPONENTS OF WETLAND Wetland plants • Helicona • Common reed 12
  13. 13. COMPONETS OF WETLAND • Inlet and outlet structures 13
  14. 14. WORKING MECHANISM • Organic matter – Aerobic microbial degradation – Anaerobic microbial degradation • Suspended solids – Sedimentation – filtration • Pathogens – Sedimentation – Filtration – Natural die-off – Predation 14
  15. 15. WORKING MECHANISM • Nitrogen – Ammonification followed by microbial nitrification (Nitrosomonas and Nitrobacter) – Denitrification(anaerobic bacteria) – Plant uptake – Matrix adsorption • Phosphorus – Matrix sorption – Plant uptake 15
  16. 16. WORKING MECHANISM • Removal efficiency 16 Wastewater constituent Removal efficiency Organic matter 80-90% (high) Suspended solids 80-90% (high) Phosphorus Approx 20% (low) Nitrogen 20-40% (low) Coliforms 1-3 log units (medium) Helminth eggs Upto 3 log units (high)
  17. 17. CONSTRUCTION • Site selection – Position and topography of land – Hydrograph preparation and data interpretation – Sub-grade soil properties – Plantation in the given area 17
  18. 18. CONSTRUCTION • Land survey – Elevation survey – Contour survey (1’ accuracy) – Potential area with most acreage of shallow water – Depth of water should be less than 3 feet 18
  19. 19. CONSTRUCTION • Levee construction – To impound and manipulate water – Compaction tests should be done – Height < 4 -5 feet – Freeboard – 1-2 feet – Side slope- 3:1 to 10:1 – Highest points near water control structures 19
  20. 20. CONSTRUCTION • Water sources – Rainfall runoff – Wells – Pumps – Upstream storage lakes 20
  21. 21. CONSTRUCTION • Water control devices – To regulate water impounded by leeves – Not flood control fixures – Types • Flashboard risers • Screw gates • Flap gates 21
  22. 22. CONSTRUCTION • Flashboard risers 22
  23. 23. CONSTRUCTION • Screw gates 23
  24. 24. CONSTRUCTION • Flap gates 24
  25. 25. THANK YOU 25

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