Algae Event June 1, 2012 Lorne Park Water Treatment Plant - - PowerPoint PPT Presentation

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Algae Event June 1, 2012 Lorne Park Water Treatment Plant - - PowerPoint PPT Presentation

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Algae Event June 1, 2012 Lorne Park Water Treatment Plant Overview The Storm and the Algae The Equipment Damage The Recovery The Repairs The Impact on the Membranes Water Treatment Capacity Lakeview WTP 1150 ML/d

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SLIDE 1

Algae Event June 1, 2012

Lorne Park Water Treatment Plant

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SLIDE 2

Overview

 The Storm and the Algae  The Equipment Damage  The Recovery  The Repairs  The Impact on the Membranes

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SLIDE 3

Water Treatment Capacity

 Lakeview WTP

 1150 ML/d (800 ML/d membranes)

 Lorne Park WTP

 500 ML/d (380 ML/d membranes)

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SLIDE 4

Lorne Park Treatment Processes

GAC Filters Intake Coagulation Flocculation Sedimentation

Coagulant

Low Lift Pumping Station GAC contactors (retrofitted filters) New Low Lift Pumps and Fine Screens Membrane Equalization Tanks (ex. flocculation Tanks) New Membrane Filtration (retrofitted Sedimentation tanks)

Conventional / UV Plant (120 ML/d) Membrane/ UVAOP/ GAC Plant (380 ML/d)

Reservoir High Lift PS UV Sodium Hypochlorite UV Zone 1 Zone 2

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SLIDE 5

Membranes

 380 ML/d capacity  16 trains  7800 individual modules  Warranty based on:

influent 1mm screening, coagulant type

(among other conditions)

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SLIDE 6

The Storm

 June 1st, 2012  Rain: 37.4 mm  Wind: 59 km/h (East)  Turbidity

1 to 60 NTU is common during storms

 Long-stringy Algae

30 ntu Raw Water Turbidity Trend

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SLIDE 7

Standard Methods: Filter-clogging algae

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SLIDE 8

Algae Coating

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SLIDE 9

Travelling Screen Damage

 1 mm travelling

screens

 Large differential

caused damage of baskets

 Screens couldn’t

rotate

 algae passed around

bent screens

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SLIDE 10

Low Lift Pump Basket Damage

 Basket coated in

algae

 Pump taken out of

service

 11 p.m. to fully

understand extent of damage

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SLIDE 11

The Solution

 Several attempts to

get 1 mm screened water to membranes

 Conventional and

membrane plants are hydraulically separated by 1.5 m

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SLIDE 12

Lorne Park Treatment Processes

GAC Filters Intake Coagulation Flocculation Sedimentation

Coagulant

Low Lift Pumping Station GAC contactors (retrofitted filters) New Low Lift Pumps and Fine Screens Membrane Equalization Tanks (ex. flocculation Tanks) New Membrane Filtration (retrofitted Sedimentation tanks)

Conventional / UV Plant (120 ML/d) Membrane/ UVAOP/ GAC Plant (380 ML/d)

Reservoir High Lift PS UV Sodium Hypochlorite UV Zone 1 Zone 2

X

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SLIDE 13

Fixing the Flow Rate

 Interconnect

valve approx. 30% open

 Reprogram

SCADA

 60 ML/d using 4

Membrane Trains

 Switch from 1 mm

to 10 mm screens

June 1

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SLIDE 14

The Repairs

 Repair crew

consolidated undamaged baskets into one screen

 7 days for one screen  8 weeks to repair

second screen

 27 damaged baskets

in total

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SLIDE 15

The Membranes

 3240 modules

exposed to the unscreened algae for several hours

 2160 modules

exposed to 10 mm screened water with coagulant for 7 days

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SLIDE 16

Impact on the Membranes

Algae Event Chlorine Clean Citric Clean

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SLIDE 17

Acknowledgements

 Ontario Clean Water Agency  Consultants

 AECOM, GENIVAR

 Contractors

 Kenaidan, Maple Reinders

 Equipment Suppliers

 GE Water & Process Technologies

(membranes)

 Siemens (travelling screens)