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Waste Water Treatment

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by

Kyle Yrjola

on 30 March 2016

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Transcript of Waste Water Treatment

Water
How does this affect you?

Determinants of Health

First step: Screening
Large materials: undissolved (wood, plastic, cloth) and other large debris (rocks, bricks, coffee grounds)
-->
filtered

-->

incinerator and landfill respectively
Second step: Pumping
Water pumped to higher elevation
-->
in to sedimentation tanks.
Third step: Grit Removal
Pumped air and gravity
-->
heavy Grit (sand and gravel) settles at the bottom
-->
Grit removed
-->
landfill.
Fourth Step: Removing Solids
Pumped air and gravity
-->
also handles left over organic materials left in sedimentation tanks
-->
the heavy
sludge
goes to the bottom
-->
lighter
scums
(grease) floats to the top
-->
both removed
-->
Digester
Last step:
Water
-->
to Fraser River > ocean, or Secondary Treatment.
Waste Water Treatment
With a Focus on the Determinants of Health
Primary Treatment
Toilet, shower, laundry, and sink water
-->
sewer
-->
gate in plant that controls the amount of water that goes in.
MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author


MetroVancouver (n.d.) What happens when I flush? [Brochure].

MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author
Photographer: Redhead, Ben. (2015)

MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author


MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author
Photographer: Redhead, Ben. (2015)

MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author


MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author


Secondary Treatment:
Trickling Filter
- Plastic Diamond shaped grids
- Surface contains bacteria
- Inside 5~6 meter silo
- Sprinkler sprays water onto grid
- 35~40 degrees Celsius (Smelly and humid)

Solid Contact Tank
- Remaining bacteria and waste clump together (heavier, sinks to bottom)

- 45% of process returned to solid contact tank, remaining to clarifiers

- Done to retain bacteria population

- Air pumped into water makes it lighter

Secondary Clarifiers
- Water slows down
- Solid materials sink to bottom
- Clear water on top
- Solid material sent to digester

Digester
- Heat + Bacteria = bio solids
- Centrifuge separates water and bio solids
- Bio solids used to reclaim mines

Sterilization Channel
- Chlorine is added to kill remaining bacteria (e.g. E coli)
- Water stays in channel for about 90 minutes
- Sampled daily; if Cl levels too high, then neutralizing salt is added

Employee Working Conditions
Personal Protective Equipment
-hard hats
-reflective vests
-boots
-coveralls
-disposable gloves
-shots/vaccinations
In addition to regular use PPE...
-Respirator suits
-Facemasks
-Life preservers

Location Safety
Signage
-Bright yellow signage in high-visibility locations
-The area was gated and secured appropriately
-WHIMIS: Class 2 B and C are common
● Biohazards
Chemical hazards (methane, chlorine, hydrogen sulfide)

Culture of Safety
-The city offers flu shots to the staff
-Employees typically change before and after
shifts

Food Safety
- treated water gets dumped back into the ocean; Lulu Island dumps their water into the Fraser River

- the Fraser River has an abundance of fishes (such as sturgeon, salmon, and sockeye)

- if untreated water gets dumped into the river, it substantially affects the fishes and other organisms that live in the water

How does that affect us?
-harmful bacteria and biochemical wastes are consumed by the fishes and other organisms that live in the water

-fishes can swim back up the stream

-untreated water can also relay back up onto the shore/ beaches, which can affect organisms living closer to shore – such as crabs, mussels, clams, etc.

-we catch these fishes and other organisms (such as shrimp, clams, etc.) to consume – this can eventually get us sick

-conditions of the water cannot accommodate for fishes to breed due to high BOD – this means less fish and less food


Cultural safety
-fishing has a significant cultural value for groups such as First Nations people

-fishing is a traditional method for how First Nations people obtain their food and provide for their families and themselves

-getting sick from consuming these fishes and not having enough fishes to fish will ultimately affect First Nation’s culture, health, and spiritual well-being

-a decrease in the fish population will also economically affect families who run fishing businesses

Land
3 of the 5 water treatment facilities
in the lower mainland have additional secondary treatment. The focus is to further lower the BOD down to 90~95 percent.


Lulu Island Waste Water Treatment Plant
Exit into Fraser River



Physical Environments
Air
Renewing and reusing water
Ensures safety of aquatic life
Recreational water activities
- We don’t have an unlimited supply of clean water!
- Treatment of waste water allows us to preserve and recycle our water resources
- Water plays a primary role in our hygiene, diet, and over all health so it is an extremely valuable resource
- Waste water treatment ensures our protection from bacteria, e. Coli, and other harmful substances found in our waste water
- Enables us to swim, boat, fish and enjoy other recreational water activities safely
- Without access to clean oceans/rivers to enjoy recreationally, this can effect our quality of life

- We do not live independently of other organisms, everyone and everything plays a part in the sustainability and homeostasis of our ecosystem and our life in general
Offensive odours
Air pollutants
Use of biosolids
Biosolid products are used for mine reclamation, landscaping soil, gravel pits, energy and compost.

Biosolids are effective in providing nutrients for plants to grow, as opposed to rocks.
Inorganic solids
Inorganic solids from the process, such as grit, and non-biodegradable materials are sent to the landfill
Waste water treatment produces pollutants, such as methane gas and carbon dioxide.

However, the release of methane gas is reduced due to cogeneration, a process where methane gas is used to produce heat for the facility
The process of waste water treatment produces strong odours, which may irritate those nearby.

Lulu Island WWTP uses a biofilter to reduce odours.
Biofilter Schematic [Drawing]. (1998). Retrieved from http://www1.toronto.ca/wps/portal/contentonly?vgnextoid=b7e807ceb6f8e310VgnVCM10000071d60f89RCRD&vgnextchannel=0db7f75e4f18f310VgnVCM10000071d60f89RCRD
Questions
MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author

MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author
Photographer: Redhead, Ben. (2015)
MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author
MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author
Photographer: Redhead, Ben. (2015)
MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author
Photographer: Redhead, Ben. (2015)
MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author
Photographer: Redhead, Ben. (2015)

Photographer: Redhead, Ben. (2015)
Environment Canada. "Wastewater Pollution." Environment Canada, 11 Apr. 2014. Web. 03 Oct. 2015. <https://www.ec.gc.ca/eu-ww/default.asp?lang=En&n=6296BDB0-1>
MetroVancouver (n.d.) What happens when I flush? [Brochure]. Canada: Author
Photographer: Redhead, Ben. (2015)
Photographer: Redhead, Ben. (2015)
Environment Canada. "Wastewater Pollution." Environment Canada, 11 Apr. 2014. Web. 03 Oct. 2015. <https://www.ec.gc.ca/eu-ww/default.asp?lang=En&n=6296BDB0-1>
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