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Lindsay DWTP

Study notes on the Lindsay DWTP tour.

Name three issues with source water from the Lindsay DWTP. Flashy, high colour, turbidity not as big of a problem (easier to remove)
What does TWA or time-weighted average limit mean? The time-weighted average airborne concentration of a biological or chemical agent to which a worker may be exposed in a work day or work week.
Winter has the biggest fluctuations in what two parameters? Hardness, and alkalinity.
Incoming through the 2 - 24" intake pipes, pH is normally at what level? 7.8 - 8
Incoming through the 2 - 24" intake pipes, turbidity is normally at what level? 2.0 - 2.5; can spike to 12 ntu's
After Actiflo, turbidity is normally what value? 0.1 ntu
After filtration and actiflo, turbidity ranges from? 0.024 - 0.039; must be under 0.3 for 90% of the time based on running average.
When leaving the plant, the optimal pH range is? 7.25 - 7.3
How much water is treated per day? 8,000 m3 (can increase if demand is needed (i.e fire; one prior to 2009 tours brought demand up to 12,000m3/day)).
When the intake becomes blocked by a build up of frazil ice, what method clears it off? Hydroburst as often as needed.
Why are low lift pumps elevated about a foot or so? To avoid taking in sludge off river bottom
How often is the Lindsay generator tested? Every other week
What is the purpose of the generator? Helps ensure required pressure is never lower than 15psi for >15mins.
How long does the take from intake to distribution? 10mins for ActiFlo, 1 hour including filtration, ~6 hours from intake to distribution.
Chlorine residual: flucations of >5 deg over a weekend can result in too high/too low chlorine residual, this is because? Need larger containment area than volume of tank holding chemicals (110-115%)
How many train systems are in operation? 2 Train system
How many pumps are on chemical feeds, and distribution? 2 for chemical feeds, and 3 for distribution.
What two coagulants are used? PACl (winter) or Alum
What does Alum need for pH adjustment (6.5-6.8)? CO2 and caustic soda (aka sodium hydroxide)
What is needed in PACl? caustic soda only needed, and only in very small doses.
What is GAC? Granulated activated carbon (filters)
How often are GAC replaced and what does it help with? Every 3 years, helps with taste & odour
When is ZM control used and what is associated with it? May-Oct only, use chlorination (need 0.5ppm). Due to THM issue; must neutralize it again with sodium bisulphate
What does SCADA stand for? Supervisory Control and Data Acquisition
Guideline for Cl2 maximum? 4mg/L
In distribution system: what is the free chlorine residual and the total chlorine residual? Free chlorine residual: 0.05, total chlorine residual: 0.25.
Where is waste water sent? To the sewage treatment plant (coagulant helps their treatment)
Created by: jjimmo