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Can treated STP water be let into lakes and recharge wells ?

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The context setting presentation that was made at the KSPCB and Citizens' dialogue on 20th March 2015

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Can treated STP water be let into lakes and recharge wells ?

  1. 1. Discharging Excess Treated STP Water into Lakes, Shallow Recharge Structures, New Ponds RESPONSIBLY KSPCB and Citizens' Dialogue
  2. 2. 15 Lakes around Sarjapura Road ● Total Watershed Area ~ 33 sq km ( ~ 8000 acres) ● Total Water Spread Area ~ 428 acres (not including Bellandur lake) ● Volume ~ 1731 million litres (average 1m depth) ● Evaporation loss ~ 2597 million litres (1.5 m annual) ● Percolation ~ 6231 million litres (10mm per day, 3.6m annual)
  3. 3. S No Lake Name Area (hectares) 1 Chikka Ambalipura 2.9 2 Dodda Ambalipura 5.47 3 Iblur 7.3 4 Parappana Agrahara 7 5 Dodda Kudlu 18 6 Chikka Kudlu 4.5 7 Haralur 9.58 8 Kasavanahalli 21 9 Kaikondrahalli Saul 18 10 Saul 25 11 Hado Siddapura 12 Halanayakanahalli 17 13 Doddakanneli 9 14 Devarabisanahalli 4.64 15 Junasandra 4.67
  4. 4. Lake Classification (as per CPCB) Legend Class 'A' Drinking water source without conventional treatment but after disinfection Class 'B' Outdoor bathing organized Class 'C' Drinking water source with conventional treatment followed by disinfection Class 'D' Propagation of wildlife, fisheries Class 'E' Irrigation, industrial cooling, controlled waste disposal
  5. 5. Primary Water Quality Criteria for various uses laid down by Central pollution Control Board
  6. 6. Artificial Recharge Volume ● Minimum 600 structures ● Minimum 2.6ML of static volume ● Catchment of < 500 acres * Data from surveys
  7. 7. 8.5 MLD: STP (at least 50% excess treated water)
  8. 8. ZERO DISCHARGE ● CFE / CFO ● Treated STP water used for landscaping + flushing ● No dual plumbing in older apartments for flushing reuse ● Disposal of excess treated waste water through honeysuckers ● Discharge out of the campus
  9. 9. Water Reuse – Options explored ● Watering of Saplings in common areas – expensive, difficult to manage ● Reuse as Domestic Water – TZED ● Others ?
  10. 10. STP Water Test Report
  11. 11. Excess treated water of good quality ● Artificial Recharge : SJR Verity, Rainbow Drive ● Saul kere : BREN Celestia, Corporates ● Upper Ambalipura, Kasavanahalli : OZONE Evergreens (100KLPD) ● Lower Ambalipura : SJR Redwoods (80 KLPD) , Trinity Woods and Acres (new STP being setup) ● Etc.
  12. 12. Questions What can be KSPCB, Citizens' role ?
  13. 13. THANK YOU !!
  14. 14. Questions - 1 ● Which are the specific water quality parameters that should be monitored and at what frequency? ● What are the acceptable values? ● Would any specific person/organization be given the task of monitoring these values? ● What would be the process for deciding the volume of sewage that can be let into the lake? ● Would this specific person/organization be empowered to keep people from dumping untreated waste water into the lakes/wells? What would be the process or who would be the person that they can escalate/discuss issues with? ● Would KSPCB play this role? ● What will be KSPCB’s role in this option?
  15. 15. Questions - 2 ● Which are the lakes that are currently experimenting with this option? ● What level of treatment, type of treatment (natural/conventional), water quality parameters is expected for disposing the water into lakes, for groundwater application, etc.? ● For Apartment complexes that do not have an STP. What is the enforcement mechanism and how do we make sure everybody follows the law? ● Does KSPCB recognize the natural treatment systems like SBT, DEWATS?
  16. 16. Phytorid STP
  17. 17. Herohalli
  18. 18. Herohalli
  19. 19. Lalbagh
  20. 20. Weather Station

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