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Dewats Decentralised natural waste water treatment system


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Natural treatment for waste/grey water

Published in: Technology, Business

Dewats Decentralised natural waste water treatment system

  1. 1. <ul><li>Decentralised waste water treatment systems </li></ul>Decentralised waste water treatment systems Auroville Centre for Scientific Research
  2. 2. <ul><ul><li>Decentralised waste water treatment </li></ul></ul><ul><ul><li>principles and devices </li></ul></ul><ul><li>Treatment for organic wastewater from domestic and industrial sources </li></ul><ul><li>Treatment of wastewater flows from 1-1000 m3/d </li></ul><ul><li>Achievement of discharge standards </li></ul><ul><li>Tolerance to inflow fluctuation </li></ul><ul><li>Minimal dependence on external energy, minimal maintenance </li></ul><ul><ul><li>Using gravity instead of pumps, avoiding valves </li></ul></ul><ul><li>Aiming towards reliable and long-lasting devices </li></ul><ul><ul><li>Priority given to anaerobic technology in warm climates </li></ul></ul><ul><ul><li>and aerobic technology in cold climates </li></ul></ul><ul><ul><li>Reuse of wastewater </li></ul></ul>
  3. 3. Pre-treatment device Settler
  4. 5. Pre-treatment Settler 1 st treatment Baffled tank reactor
  5. 8. Anaerobic filter
  6. 10. Planted gravel filter
  7. 12. Polishing pond
  8. 14. <ul><li>Pre-treatment is done in a Settler </li></ul><ul><li>A device which separates the liquid from the solid, </li></ul><ul><li>retention time is only 2 hours . </li></ul><ul><li>Pollution reduction is around 30% </li></ul><ul><li>First treatment takes place in a Baffled Tank </li></ul><ul><li>A device with several identical chambers </li></ul><ul><li>through which the effluent moves </li></ul><ul><li>from top to bottom. </li></ul><ul><li>Retention time is 24 hours . </li></ul><ul><li>Pollution reduction is around 80% </li></ul>Natural treatment of waste water occurs by channeling the effluent through several devices:
  9. 15. <ul><li>Second treatment takes place in a anaerobic filter </li></ul><ul><li>A device filled with a filter material (cinder) through </li></ul><ul><li>Which the effluent moves from top to bottom. </li></ul><ul><li>Retention time is around 8 hours. </li></ul><ul><li>Total pollution reduction is around 90% </li></ul><ul><li>At this stage CPCB standards are met </li></ul><ul><li>but the effluent still has an odour </li></ul><ul><li>Third treatment takes place in a planted gravel filter </li></ul><ul><li>A structure filled with gravel material and </li></ul><ul><li>planted with water resistant plants, who </li></ul><ul><li>provide oxygen to the passing effluent. </li></ul><ul><li>Retention time is 1 ½ day. </li></ul><ul><li>Pollution reduction is around 90% </li></ul>
  10. 16. <ul><li>Post treatment takes place in polishing ponds </li></ul><ul><li>fitted with aquatic plants and fishes. </li></ul><ul><li>It is through this device that the water transforms </li></ul><ul><li>from a lifeless state into living water again. </li></ul><ul><li>Ponds with aquatic plants are an efficient way </li></ul><ul><li>to combine wastewater treatment, </li></ul><ul><li>landscaping, aesthetics and water reuse, </li></ul><ul><li>the pond can also act as a storage device. </li></ul>Underground anaerobic process Above ground level aerobic process CPCB standards are met at this point, except for the smell control Overview of the different devices
  11. 17. Surya Nivas, 2003 – 12 users
  12. 19. Samasiti, 2009 - 25 PE
  13. 20. Solar Kitchen, 1998 – 40 m³
  14. 23. Surya Nepal Pvt Ltd (subsidiary of ITC) 125 m³/day
  15. 26. Surya Nivas, Nepal 60 m³ /day
  16. 28. Kadambadi settlement Nagipattinam Post Tsunami Dewats projects
  17. 34. Vortex systems for waste water treatment
  18. 37. <ul><li>ATS – Algal Turf Scrubbers </li></ul><ul><li>Treating toxic waste water </li></ul><ul><li>Algal are grow in shallow basins for cleaning water pollution, </li></ul><ul><li>including heavy metals </li></ul><ul><li>In the process Biomass is grown and harvested for Energy </li></ul><ul><li>- gas methane/ethanol/butanol </li></ul><ul><li>- Bio-diesel – bio-aviation fuel </li></ul><ul><li>Note: solar energy absorption by algal is 45 to 50%, </li></ul><ul><li>increase in biomass doubles/24 hrs, during the </li></ul><ul><li>process algal absorbs CO2 and gives off oxygen </li></ul><ul><li>ATS needs </li></ul><ul><li>Start up investment </li></ul><ul><li>Land area is required for installing the basins </li></ul>
  19. 38. Integrating ATS – Algal Turf Scrubbers the use of algae for cleaning toxic waste water
  20. 41. Auromode
  21. 42. “ And justify the light on Nature’s face.”