Transcript PP Water treatment 2

Water Unit: ENVIRONMENTAL SCIENCE 302
LOCH
How sure are you?
CREATE A KWL CHART
Each student reads the next
slide
Go to the website on the wikipage
http://www.wef.org/flash/gowiththeflow_english/theflow.htm
This will teach you basic information about the wastewater
treatment plant
1. The SOURCES of wastewater
2. The STEPS in treatment (primary,
secondary, advanced)
3. The FATE of the end products
Today: Create a graphic organizer to follow along and organize
your info
Longterm: you have until class next Wednesday to show me –
everyone in the class that is – that you understand this
information. How are you going to do that?
In the Primary, Secondary, Advanced columns,
sort these concepts correctly
Optional, not usually done
Settles large particles
Filters large particles which
go to a landfill
Removes pollutants like
nitrates and phosphates
Removes bacteria with
chlorine or ultraviolet light
Adds O2 to promote
bacterial growth
Uses a 2nd filter
Bacteria added to
decompose waste

Now that you have the gist, show me
that you know this very well. Which
means:
› You can clearly represent the steps to me
› In a different context
› It will be creative and help your classmates
(or other classes) learn
› It will answer one of our original questions
•How
long does the treatment process take?
•Is the sludge safe for the water after purification?
•Is there a way to fully clean water (as good as it
was before)?
•How does a water tower work?
•Where does the stuff go that is filtered out?
•What chemicals are used in purification?
•Are we doing more harm putting chemicals in the
water than treating the waste?
•Where does a fish go when you flush it?
•Where does the process start?
•Why
does water fountain water taste different?
•How do we know if water is contaminated?
•How long does the process take?
•Is natural filtration as good as a treatment plant?
•What factors affect the process?
•Is toilet water clean enough to drink?
•How do companies shut off your water?
•Why is tap water in other countries unsafe to drink?
•What happens to toilet paper?
•What happens to random objects (fish) that get
flushed?
•How
do they get out things that have dissolved in
the water (polar)?
•Is toilet water actually dirty?
•How long is the process from toilet to tap?
•Why does sewage smell?
•Why is water from the faucet sometimes white?
•Is finding Nemo accurate?
•What happens to stuff that you put down the toilet?
•What happens to poison, drugs?
•Why do some people think you can’t drink the sink
water?
Toilet
 Sink
 Washing Machine
 Dishwasher
 Your house, a laboratory, an industrial
factory, etc…


PHYSICAL
Filtering large particles  goes to landfill
 Settle large particles  on to secondary


removes ~60% of suspended solids from
wastewater.

BIOLOGICAL

Bacterial growth promoted, then killed
› Aeration encourages bacterial growth
 puts O2 back into water
› Bacteria decompose waste – yum!
› Bacteria are killed via chlorine (usually)

Removes >90 percent of suspended solids.

CHEMICAL & PHYSICAL

“optional” (not done conventionally)

Reduce pollutants of “special concern”
› Nutrients like Nitrates and Phosphates…why?

Uses coagulating chemicals & a 2nd filter
WATER



Into a lake or river 
ocean
Crops/Golf course
Possible problems?
SLUDGE




Lagoon
Incinerator
Crop fertilizer
Possible problems?
Beauty Products
Medicine
Engine Oil
Paint
Lawn Care Products
Photographic Chemicals
Used Cooking Oil
Fat from cooking Bacon
Diapers
Condoms

Wastewater tx plants will always be in
the basin of a watershed…why?
http://www.youtube.com/watch?v=Q7b
Vx8FBx5s&feature=related
 Start at 20sec

Recycles wastewater to drinking water
 Video clip

Wastewater
Treatment
Recap
Recycles wastewater to drinking water
 Video clip

2.
1.
3.
4.
6.
5.
Purification depends on $$$



Boiling
Using Sun’s Rays to
disinfect
Lifestraw


Purification plants
Toilet to Tap
How’s this linked to…
Life expectancies?
Natural Disasters?
Hiking?
What do you normally drink?
Why?
What do you know about
bottled water?

Show the differences and similarities
between drinking water and wastewater
treatment.
•Where
does the poop go?
•Do we drink our own wastewater?
•How is drinking water filtered?
•Do dead fish get to the ocean if you flush them?
•Where does the stuff go that is filtered out?
•Is the water cycle on any other planets?
•How much water does Philly use on a daily basis?
•How can you tell if your water is clean?
•What happens if you drink your own poop water?
•Is toilet water drinkable?
•Do we use our waste for anything productive?
•Why
does water fountain water taste different?
•How do we know if water is contaminated?
•How long does the process take?
•Is natural filtration as good as a treatment plant?
•What factors affect the process?
•Is toilet water clean enough to drink?
•How do companies shut off your water?
•Why is tap water in other countries unsafe to drink?
•What happens to toilet paper?
•What happens to random objects (fish) that get
flushed?
•How
do they get out things that have dissolved in
the water (polar)?
•Is toilet water actually dirty?
•How long is the process from toilet to tap?
•Why does sewage smell?
•Why is water from the faucet sometimes white?
•Is finding Nemo accurate?
•What happens to stuff that you put down the toilet?
•What happens to poison, drugs?
•Why do some people think you can’t drink the sink
water?

Fill in more items in the “L” column of
your KWL
Wastewater from city
Grit Filters (to
remove large
matter)
Sedimentation
tank
Trickling filter
To stream
Tertiary
treatment
Secondary
filters
Aeration
Water from rivers / lakes
Primary Filters
(to remove
large matter)
Flocculation tank
Sedimentation
tank
To tanks in the city
Chlorination
Rapid / slow
sand filtration

What does it include?
› Brainstorm a list of 5 contents

Where does it come from?
› Brainstorm a list of 5 contents

Why should humans care?

Why are we concerned about water
usage if the law of conservation of
matter is true?


Disease-causing pathogens can destroy food chains
Organisms die….leading to low oxygen levels via
decomposers
› May be due to increased algal growth or more directly via
toxic kills

Chlorine compounds and inorganic chloramines can
be toxic to aquatic invertebrates, algae and fish;

Bioaccumulation
›

Metals, such as mercury, lead, cadmium, chromium and
arsenic can build up a food chain
Pharmaceutical and personal care products may
cause unknown effects…
http://ga.water.usgs.gov/edu/wwvisit.ht
ml
 Stages of treatment, purpose of a
treatment plant
