Download - NAIT 2015 WE
Water and Wastewater Treatment
Distribution / Collection
Solid Waste
PRACTICUMStudent shadows an experienced
operator of the water plant and wastewater plant. Gradually the student takes over more and more of an operator’s routine duties until by the end of the summer the student is fully operating the plants under normal conditions, though still under supervision of the training operator
Unusual situation of a water treatment plant and a wastewater treatment plant both on the same site. Operators operate both plants simultaneously
Wastewater plant is a Level IV plantWater plant is a Level III plant, soon to be
reassessed as a Level IV plant
There are approximately 20 operators operating the two plants, 4 of which have Level 4 in both Water and Wastewater Treatment
Aquatera produces around 30 MLD of potable water and treats around 25 MLD of wastewater
WTPprocess
Water is drawn from the Wapiti River into storage ponds. From wells in the low lift pumphouse water is brought up to the plant where Polyaluminium Chloride (PACl) is injected as coagulant and Polymer is added as flocculent aid
WTPprocess
Water moves through 3 flocculation tanks and continues on to sedimentation and tube settling tanks
PACl is added again pre filtering as a filter aid.
WTPprocess
Filters are dual media, 1.6 m anthracite above .5 m quartz sand
WTPprocess
Chlorine, Cl2 from tonners, is injected prior to the filters as well as the clearwell. Chlorine is further added at various booster stations in and around Grande Prairie using calcium hypochlorite pucks
Disinfection
WTPprocess
Water Plant DAF
Filter backwash water and sedimentation tank sludge is pumped to Dissolved Air Flotation (DAF) tank
Scum goes to centrifuge and subnatant to wastewater plant
WWTPprocessActivated Sludge
Biological Nutrient Removal (ASBNR)
Activated Sludge is the biological treatment of wastewater using a
population of microorganisms suspended in water
BNR is a sub process of the above, essentially the biological removal of
Nitrogen and Phosphorus from wastewater
WWTPprocess
Raw wastewater is lifted with screw pumps up to the headworks, where it passes through a vortex (grit goes to landfill), through step screen (rags etc. to landfill), flowing into…
WWTPprocess
primary clarifiers where sludge settles (pumped to the WW Dissolved Air Flotation (DAF) tank), and the supernatant flows into the…
ASBNR bioreactors
WWTPprocess
where it mixes with high concentrations of bacteria. This mixed liquor then passes through the various anaerobic, anoxic, and aerobic zones that make up the bioreactors. It is in the ASBNR bioreactors where the bacteria do the majority of their work. Mixed liquor then goes onto the…
WWTPprocess
where the bacteria rich activated sludge settles out and the supernatent becomes the finished plant effluent, returning to the Wapiti River
Secondary clarifiers
WWTPprocess
Most of activated sludge (bacteria) is returned (RAS) to the head of the ASBNRs, with any excess wasted (WAS) to the WW DAF (Dissolved Air Flotation)
WWTPprocess
WW DAF receives primary clarifier sludge as well as WAS from secondary clarifierSubnatent of DAF is sent to head of ASBNRs. Scum is pumped to Autothermal Thermophilic Aerobic Digestion (ATAD) tanks
ATADs (aerobic digesters)
WWTPprocess
Everything that cannot be digested is sent to centrifuges, with the solids going to landfill and the centrate sent to head of the ASBNR bioreactors
Operators run both plants at the same time 24 hours a day, on 12 hour shifts. Operators also work weeks of 8 hour days consisting mostly of preventative maintenance duties. Work orders include the plants as well as booster stations, pumphouses, and reservoirs in and around Grande Prairie
OPERATING
SCADA screens are used to observe and adjust process, check for problems, and respond to alarms OPERATING
Operators do several walk throughs every shift checking equipment and process, and
making adjustments as necessary
OPERATING
During walk throughs operators record data, take measurements, clean and calibrate various metering equipment, collect samples
for lab work…
OPERATING
Lab TestingWater
6x daily: chlorine, turbidity of potable,
filter influent, and raw2x daily: pH, UVT,
flourideDaily: total chlorine, alkalinity (raw and
potable) Weekly: Bac-T samples for external lab testing
Also occasional jar testing to determine
polymer and PACl dosages
OPERATING
OPERATINGLab Testing
Wastewater Daily: BOD, CBOD, pH,
Phosphorus, Ammonia Nitrogen, Nitrate,
Nitrite, Total Kjeldahl Nitrogen
(TKN), TSS Weekly:
MLSS, MLVSS, and SVI
A large amount of
data is collected
during the day from the plant and the
lab which must daily be entered
into spreadsheets
OPERATING
Population 70,000
Grande Prairie Regional College
Montrose Cultural Centre – Library, Art Gallery
Sport Multiplex - pool, water park, ice rink, gym, restaurants
Muskoseepi Park and Bear Creek Ravine – parkland, bicycle trails
