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Project Shotover

This project focuses on the modification of the Ludzack-Ettinger (MLE) wastewater treatment plant in Shotover, addressing the decrease in effluent limits and the increase in population in Queenstown. The project includes the construction of inlet works, septage treatment, MLE reactors, clarifiers, waste activated sludge management, and UV disinfection. The aim is to improve the treatment process and ensure compliance with environmental standards.

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Project Shotover

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  1. Project Shotover Modified Ludzack-Ettinger Wastewater Plant

  2. Project Shotover Modified Ludzack-Ettinger (MLE) Wastewater Treatment Plant.

  3. Project Shotover: MLE Wastewater Treatment Plant

  4. Project Shotover: Introduction • Population increase in Queenstown • Discharge effluent BOD, Total Suspended Solids, Ammonical Nitrogen and Total Nitrogen limits decreased in new consent.

  5. Project Shotover: Inlet Works • Highest flow is from the Queenstown line (100-200l/s) • Three other inflow lines

  6. Project Shotover: Inlet Works

  7. Project Shotover: Example of Site Flows

  8. Project Shotover: Septage • Septage truck drivers swipe their card which identifies them and the volume received is recorded. • 100m3 tank • Rock trap, macerator, pump and flow meter • Septage is pumped to the inlet works

  9. Project Shotover: Wastewater flows • Highest flow from Queenstown 1 (100-200l/s) • Flow split is approximately 63% to MLE and 37% of flow to the ponds • 80% of water used onsite is recycled process water from the clarifier filtered and UV treated

  10. Project Shotover: Modified Ludzack-Ettinger (MLE)

  11. Project Shotover: MLE Plant • Aeration Zone • Anoxic Zone in Foreground

  12. Project Shotover: MLE • Influent Wastewater has grit removal, is screened and pumped to the inlet of MLE. • Two recycle streams- RAS Return activated sludge from the clarifier and the A-recycle- recycled mixed liquor from aerobic zone • Mixed liquor from the aerobic zone 2 flows to the clarifier and then to the UV before Discharge.

  13. Project Shotover: Modified Ludzack-Ettinger (MLE) Reactor

  14. Project Shotover: MLE • Influent, A-recycle and Recycled Activated Sludge RAS into Pre-anoxic zone • Aerobic zones 1 and 2 – Nitrification • A-recycle mixed liquor suspended solids from aerobic zones to anoxic zone for Denitrification

  15. Project Shotover: Nitrification and Denitrification • Aeration Zone • Nitrification • Anoxic Zone in Foreground • Dddd • Denitrification

  16. Project Shotover: MLE Plant • Nitrification: Aeration Zone • NO3- Nitrate-N N2 Nitrogen gas + N2O Nitrous oxide • Denitrification: Anoxic Zone • NH3+NH4+ Ammonical N NO3- Nitrate-N

  17. Project Shotover: Example Nutrient Results

  18. Project Shotover: Aeration • Fine bubble diffused aeration diffusers for swing(when operating as aerated) and aerobic zones 1 and 2. • Dissolved Oxygen meters in each zone feedback to modulate blower speed and control valves

  19. Project Shotover: Aeration • Dissolved Oxygen Targets in MLE • Anoxic zone <0.5ppm • Swing zone =2ppm (when aerated) • Aerobic zones =2ppm

  20. Project Shotover: Clarifier • 34m diameter, 4.5m deep • Removal of sludge via perforated sludge collection pipe vacuum rotation • Floating solids collected by surface scraper rotational bridge and removed to scum tank

  21. Project Shotover: Clarifier • Recycled Activated Sludge RAS stream removed from clarifier base and pumped to pre-anoxic zone • RAS flow rate is typically 0.8-1x MLE influent flow rate

  22. Project Shotover: Waste Activated Sludge • Waste Activated Sludge (WAS) is removed from the MLE and dewatered • The target solids % from the centrifuges is 20% and 95% capture • Cake and centrate are affected by factors including; WAS solids %, polymer type, concentration and dose point, centrifuge solids loading and settings

  23. Project Shotover: Decanters • Two GEA decanters for dewatering Waste Activated Sludge (WAS) • Target sludge solid content >20% solids, recovery >95%

  24. Project Shotover: UV and Discharge • Pond and MLE effluent blended before UV treatment approximately 63% MLE: 37% Pond Effluent • 7 bank UV, 11 lamps • UVT generally around 51%

  25. Project Shotover: Biological Commissioning • Seed sludge not used, sludge MLSS was built from influent wastewater and recycle • Increased Christmas and New Year load assisted with building MLE biomass

  26. Project Shotover: Questions

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