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Treatment options for rainwater harvesting systems

Rainwater harvesting can be a good water source, but treatment and purification is often needed. Rainwater can be acidic and corrosive to pipe and fixtures, and contain bacteria and parasites.

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Treatment options for rainwater harvesting systems

  1. 1. Treatment Options for Rainwater Harvesting Systems For more information go to:
  2. 2. Rainwater is in Abundance
  3. 3. Rainwater often used for non-potable water applications
  4. 4. Benefits of RainwaterProvide water for rural areasReduce the dependence and demand of public water supplyReduction of water billsAdditional water supply for fire protection or emergency useReduce land erosion and floodingReduce salt accumulation in soil which can be harmful to root growth
  5. 5. Rainwater quality affected by atmospheric contaminationCarbon dioxide (CO2) levels - affect pH, creating acidic waterPollution from industry - industrial pollution such as sulfur dioxidePollution from agriculture – pesticides and herbicides
  6. 6. Rainwater quality affected by roof or other catchment surfaces
  7. 7. Maintaining Roof Water Quality• Regularly inspect and clean gutters, roof catchments and tank screens.• Remove overhead branches and clear trees near roof.• Consider installing gutter screens or guards.• Ensure tank does not become a mosquito breeding site by preventing access and cleaning screens regularly.• Examine tank for accumulation of sludge every year and remove by siphon or by empting the tank.• Shock sanitize by adding 40 mm of liquid bleach or 7 grams of granular calcium hypo-chlorite per 1000 liters of water.
  8. 8. Basic Rainwater System with manual roof-washer
  9. 9. Basic Roof Washers
  10. 10. Commercial Roof Washer Valves• The roof washer is sized to collect at least 30 liters of water for every 100 sq m of catchment area.
  11. 11. Commercially Available Roof Washer
  12. 12. Large capacity rainwater storage tanks
  13. 13. Polyethylene Tanks
  14. 14. Polyethylene tanks are light
  15. 15. Underground Tanks
  16. 16. Ferro Cement Tank
  17. 17. Water Quality of Rain Water
  18. 18. Rainwater Quality (Malaysia)
  19. 19. Typical rainwater LSICorrosive water cancause heavy-metalssuch as lead to leachinto water from:• Fixtures• Appliances• Water heaters• Brass fixtures• Brass valves
  20. 20. Copper corrosion from rainwater
  21. 21. Langelier Index• pH• Alkalinity• Calcium carbonate• Total dissolved solids• Temperature
  22. 22. Calcite – Calcium Carbonate
  23. 23. Calcite pH Neutralizers/Filter Systems
  24. 24. Neutralizer with UV Sterilizer
  25. 25. UV
  26. 26. Chlorination Solid pellet chlorine feedersLiquid bleach chlorine feeder
  27. 27. Ozone Treatment
  28. 28. Corona Discharge Ozone Generator with Air Dryer
  29. 29. Ozone Bubbler with Compressor
  30. 30. Rainwater Collection Tank with OzoneBubbler and automatic ORP controller
  31. 31. Ozone Bubbler in Outside Shed
  32. 32. Ozone Bubbler in Shed
  33. 33. Ozone Bubbler With UV and Calcite Carbon Filter System
  34. 34. Ozone Diagram with Contact Tank
  35. 35. Ozone Recirculation System with UVand Calcite-Carbon Filtration System
  36. 36. Automatic Controls• ORP can be used to control disinfection
  37. 37. Filtration 50 / 5 Micron
  38. 38. Filtration 1 Micron
  39. 39.