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PRESENTATION TITLE Presented by: Name Surname Directorate Date

PRESENTATION TITLE Presented by: Name Surname Directorate Date. MVOTI TO UMZIMKULU NWRCS Update of Scenarios 24 March 2014. Layout of Presentation. Waste water management scenarios – Why is it relevant? Extend of wastewater generation in study area: Ugu Illembe Ethekwini

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PRESENTATION TITLE Presented by: Name Surname Directorate Date

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  1. PRESENTATION TITLE Presented by: Name Surname Directorate Date MVOTI TO UMZIMKULUNWRCS Update of Scenarios 24 March 2014

  2. Layout of Presentation • Waste water management scenarios – Why is it relevant? • Extend of wastewater generation in study area: • Ugu • Illembe • Ethekwini • Ultimate Future Wastewater Scenario • Alternative Wastewater Management Options • Formulation of Scenarios • Discussion

  3. Wastewater management scenarios – Why is it relevant? • Typical ecological implication on estuary health: • Change in function (open and close characteristics) of estuary due to continuous base flow. • Elevated nutrient load causing eutrophication, resulting in depletion of dissolved oxygen concentrations, inhibiting organism health. • Increasing need for waterborne sanitation services requiring treatment and disposal.

  4. Classification Perspective • Classification entails finding an appropriate balance between the protection of the ecology , on the one hand, and the socio-economic implication, on the other. • Balance derived by considering and evaluation scenarios. • Pilot Investigation of the DWS study identified the need to assess alternative wastewater disposal options in context of the implication on the ecological health of the affected estuaries.

  5. Information sources to define the extent of wastewater discharges and scenarios • Ugu • Green Drop GIS Data – location • Current discharge volumes (Green Drop) • Ulitmate dischage volumes (ISP,WSDP, DWS Studies) • iLembe • GIS data – location of treatment plants • Current discharge volumes (Green Drop) • Ulitmate dischage volumes (ISP,WSDP, DWS Studies, Siza Water) • eThekwini: • GIS data – location of treatment plants. • Current discharge volumes and quality. • Spatial Development Plan with associated Ultimate Wastewater Discharge Scenario.

  6. Wastewater management in Ugu DM

  7. Wastewater management in Ugu DM • Identified 21 wastewater treatment plants. • Total current discharge volume 26.7 Ml/day (9.8 million m3/annum)

  8. Wastewater in Ugu DM

  9. Wastewater plants in iLembe DM

  10. Wastewater in iLembe DM • Identified 7 wastewater treatment plants. • Total current discharge volume 25.8 Ml/day (9.4 million m3/annum)

  11. Wastewater plants In eThekwini MM

  12. Wastewater in eThekwini MM (north)

  13. Wastewater in eThekwini MM (south)

  14. Wastewater in study area (summary)

  15. Alternative Wastewater Management Options • Identified the following types of alternative options: • Additional treatment processes to reduce the nutrient pollution load discharged. • Transferring treated waste from a sensitive estuary to a river and estuary system that is able to assimilate the additional load. • Discharge of wastewater through sea outfall works - discharges to estuaries are reduced or eliminated. • Re-use of treated wastewater, both direct and indirect.

  16. Identified Option in the eThekwini area • Identified 27 primary options related to each river system • Sub-options: Relating to levels of treatment and phasing. • Eliminate 12 options through inspection • Prepare concept design and costing for 15 primary options. • (Capital and O&M costs)

  17. Indirect reuse (Hazelmere Dam) • Transfer water from proposed uMdloti, Tongaat and Phoenix WWTWs to Hazelmere Dam. • Various flow combinations from plants and range of flow volumes. • From 50 to 225 Ml/day volume transferred to Hazelmere Dam. • Different nutrient treatment levels. • Account for upgraded water treatment to handle transfer water. • Undertook a salinity study to determine maximum transfer volumes. • Benefit of increased water availability will be reflected in economics.

  18. Mdloti System Scenarios

  19. Proposed Scenarios Sub-scenarios with alternative treatment processes

  20. QUESTIONS FOR CLARIFICATION

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