disinfection system

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UVDisinfection System

Detailed Design

Ashbridges Bay Treatment Plant

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• Meeting Objective

• Project Background

• Project Implementation

• Design Criteria

• UV Disinfection Facility

• UV Supplier Selection

• Effluent Discharge Management

• Capital / Project Schedule

Agenda

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Presentation of the UV Disinfection Facility detailed design prior to Tendering and Construction

Meeting Objective

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Project Background

• Improved ABTP 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

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Project Objective

• Design and 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

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• 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

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Project Overview

Seawall Substation

Upgrades and New Standby Generators

Plant Water Pumping Station

Upgrades

New Disinfection

Building

New Bypass

Water Tower Elimination

New Outfall (by others)

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New Disinfection Building

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Disinfection Building Overview

Architectural 3DGround Floor Plan

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Disinfection Building Overview

Architectural 3DSecond Floor Plan

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Disinfection Building Overview

Architectural 3DThird Floor Plan

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Disinfection Building Overview

• Combination of Green Roof / Cool Roof

• Solar Wall

Green Roof

Architectural 3DRoof Plan

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UV Facility

UV Equipment UV Channel

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Sodium hypochlorite

Sodium bisulfite

Chemical Storage and Dosing System

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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

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UV Equipment Competitive Pre-Selection

Monetary Criteria

• Equipment capital cost

• Facility capital cost

• Operating cost

Non-Monetary Criteria

• Vendor experience

• Performance guarantee

• Service capabilities

• Replacement parts

• Reference facilities

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• Highest score

• Lower energy consumption

• Lower number of lamps

UV Pre-selected Supplier – TrojanUV

Lamp TechnologyNumber of

LampsRequired

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

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Discharge To Lake 2017 – 2020 (during UV facility construction)

By-Pass Disinfection

Existing Outfall and Seawall Gates

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Discharge to Lake 2020 to 2023 (UV operation during new outfall construction)

By-Pass Disinfection

Existing Outfall and Seawall Gates

UV Disinfection

UV

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Discharge to Lake 2023 (UV and new outfall)

By-Pass Disinfection

UV Disinfection

UV

New 3,923 MLD Outfall

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Cost and Project Schedule

Total Project Cost (2019 CAD) $220M

Total Estimated Construction Duration 3 years

2017 2018 2019 2020 2021 2022 2023

100% Detailed Design

Start Construction

UVOperationOld Outfall

UV Operation

New Outfall

Design Construction Operation

Tender

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Conclusions

• Meeting EA requirements and applicable regulations

• Eliminate effluent chlorination (during normal operation with UV)

• Improve effluent quality and near shore lake water quality

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Thank you

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