Study notes on the Lindsay DWTP tour.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Name three issues with source water from the Lindsay DWTP. | Flashy, high colour, turbidity not as big of a problem (easier to remove)
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| 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.
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| Winter has the biggest fluctuations in what two parameters? | Hardness, and alkalinity.
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| Incoming through the 2 - 24" intake pipes, pH is normally at what level? | 7.8 - 8
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| Incoming through the 2 - 24" intake pipes, turbidity is normally at what level? | 2.0 - 2.5; can spike to 12 ntu's
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| After Actiflo, turbidity is normally what value? | 0.1 ntu
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| 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.
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| When leaving the plant, the optimal pH range is? | 7.25 - 7.3
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| 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)).
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| When the intake becomes blocked by a build up of frazil ice, what method clears it off? | Hydroburst as often as needed.
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| Why are low lift pumps elevated about a foot or so? | To avoid taking in sludge off river bottom
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| How often is the Lindsay generator tested? | Every other week
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| What is the purpose of the generator? | Helps ensure required pressure is never lower than 15psi for >15mins.
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| How long does the take from intake to distribution? | 10mins for ActiFlo, 1 hour including filtration, ~6 hours from intake to distribution.
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| 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%)
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| How many train systems are in operation? | 2 Train system
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| How many pumps are on chemical feeds, and distribution? | 2 for chemical feeds, and 3 for distribution.
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| What two coagulants are used? | PACl (winter) or Alum
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| What does Alum need for pH adjustment (6.5-6.8)? | CO2 and caustic soda (aka sodium hydroxide)
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| What is needed in PACl? | caustic soda only needed, and only in very small doses.
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| What is GAC? | Granulated activated carbon (filters)
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| How often are GAC replaced and what does it help with? | Every 3 years, helps with taste & odour
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| 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
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| What does SCADA stand for? | Supervisory Control and Data Acquisition
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| Guideline for Cl2 maximum? | 4mg/L
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| In distribution system: what is the free chlorine residual and the total chlorine residual? | Free chlorine residual: 0.05, total chlorine residual: 0.25.
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| Where is waste water sent? | To the sewage treatment plant (coagulant helps their treatment)
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