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Disinfection System
The document summarizes the detailed design of a UV disinfection system for the Ashbridges Bay Treatment Plant. The key points are: 1) The UV system will allow the plant to discontinue use of chlorine and seawall gates, improving effluent quality and lake water quality. 2) The design includes a new disinfection building to house UV equipment that was selected through a competitive process. 3) Construction will take place from 2017-2023, with the UV system operating during construction of a new outfall to replace the existing one.
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Disinfection System
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- 2. 2 • Meeting Objective •Project Background • Project Implementation • Design Criteria • UV Disinfection Facility • UV Supplier Selection • Effluent Discharge Management • Capital / Project Schedule Agenda 2
- 3. 3 Presentation of theUV Disinfection Facility detailed design prior to Tendering and Construction Meeting Objective 3
- 4. 4 Project Background • ImprovedABTP discharge treated effluent quality • Discontinue use of the Seawall Gates • Improved nearshore water quality at ABTP • Eliminate chlorination by-products during normal operation • Eliminate residual chlorine during by-pass • Increased ABTP process reliability and operational flexibility • Connect to the new outfall 4
- 5. 5 Project Objective • Designand construct an UV disinfection facility that meets all regulations Success Factors • Elimination of residual chlorine discharge to the lake • Discontinue the use of the seawall gates • Improvement of the nearshore water quality • Meeting EA commitments Project Implementation 5
- 6. 6 • Effluent flows –818 MLD (rated capacity) – 2,000 MLD – 3,300 MLD • Effluent UV disinfection (normal operation) • Effluent chlorination / dechlorination (by-pass mode) Design Criteria 6
- 7. 7 Project Overview Seawall Substation Upgrades and NewStandby Generators Plant Water Pumping Station Upgrades New Disinfection Building New Bypass Water Tower Elimination New Outfall (by others) 7
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- 9. 9 Disinfection Building Overview Architectural3D Ground Floor Plan 9
- 10. 10 Disinfection Building Overview Architectural3D Second Floor Plan 10
- 11. 11 Disinfection Building Overview Architectural3D Third Floor Plan 11
- 12. 12 Disinfection Building Overview •Combination of Green Roof / Cool Roof • Solar Wall Green Roof Architectural 3D Roof Plan 12
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- 14. 14 Sodium hypochlorite Sodium bisulfite ChemicalStorage and Dosing System 14
- 15. 15 Energy Conservation Measures •Green Roof • Solar Wall • Heat recovery to reduce operational cost • Occupied/ unoccupied control (light and heat) • VFDs provided to all fans & pumps • Heat reclaim for domestic water heating • Ultra high efficiency and high efficiency motors and lighting • Mechanical control system linked to ABTP central computer system • Environmentally friendly refrigerants in air- conditioning system • Variable Refrigerant Flow (VRF) in air-conditioning system 15
- 16. 16 UV Equipment CompetitivePre-Selection Monetary Criteria • Equipment capital cost • Facility capital cost • Operating cost Non-Monetary Criteria • Vendor experience • Performance guarantee • Service capabilities • Replacement parts • Reference facilities 16
- 17. 17 • Highest score •Lower energy consumption • Lower number of lamps UV Pre-selected Supplier – TrojanUV Lamp Technology Number of Lamps Required Power Draw Low Pressure – High Output 4,720 1,180 kW Medium Pressure – High Output 1,680 4,300 kW New Low Pressure – Very High Output 1,408 1,280 kW 17
- 18. 18 Discharge To Lake2017 – 2020 (during UV facility construction) By-Pass Disinfection Existing Outfall and Seawall Gates 18
- 19. 19 Discharge to Lake2020 to 2023 (UV operation during new outfall construction) By-Pass Disinfection Existing Outfall and Seawall Gates UV Disinfection UV 19
- 20. 20 Discharge to Lake2023 (UV and new outfall) By-Pass Disinfection UV Disinfection UV New 3,923 MLD Outfall 20
- 21. 21 Cost and ProjectSchedule Total Project Cost (2019 CAD) $220M Total Estimated Construction Duration 3 years 2017 2018 2019 2020 2021 2022 2023 100% Detailed Design Start Construction UV Operation Old Outfall UV Operation New Outfall Design Construction Operation Tender 21
- 22. 22 Conclusions • Meeting EArequirements and applicable regulations • Eliminate effluent chlorination (during normal operation with UV) • Improve effluent quality and near shore lake water quality 22
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