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HSC Biology
• Module 3: The Search For Better Health
1. Over 3000 years ago
the Chinese and
Hebrews were
advocating cleanliness
in food, water and
personal hygiene
1. • Gather, process and analyse information from
secondary sources to describe ways in which
drinking water can be treated and use available
evidence to explain how these methods reduce
the risk of infection from pathogen
2.
Students:
Water
Cleaning water is more difficult than cleaning food!
Water is everywhere and can easily be contaminated with
the many microorganisms and microbes flying around.
Pathogens in our drinking water can
cause some serious illnesses
😷 💀 🤒 💀
Pathogens in our drinking water can
cause some serious illnesses
Very important
😷 💀 🤒 💀
Most developing countries have a poor health system, and
poor water treatment and sewage process
Haiti Chad
Ethiopia
Afghanistan
India
Laos
Cambodia
Most developing countries have a poor health system, and poor
water treatment and sewage process
Most developing countries have a poor health system, and
poor water treatment and sewage process
Haiti Chad
Ethiopia
Afghanistan
India
Laos
Cambodia
Most developing countries have a poor health system, and poor
water treatment and sewage process
Those highest at risk from
contaminated water are generally
young children since their immune
systems are not strong enough to
fight against waterborne diseases
https://www.sydneywater.com.au/
Education/Tours/virtualtour/html/
wastewater-journey.html
Sydney water
http://www.hunterwater.com.au/
Water-and-Sewer/Water-Supply/
Water-Treatment-Processes.aspx
Hunter water
1. First Stage
Removing large and small solid particles in the water
≈
1. First Stage
Removing large and small solid particles in the water
Contains waste
and a lot of large
solid particles
≈
1. First Stage
Removing large and small solid particles in the water
Larger things
are removed first
≈
1. First Stage
Removing large and small solid particles in the water
Larger things
are removed first
≈
Filtering out all the unwanted things like
paper, plastics, leaves, and plant
matter.
Filter
≈
1. First Stage
Removing large and small solid particles in the water
Larger things
are removed first
≈
Filtering out all the unwanted things like
paper, plastics, leaves, and plant
matter.
≈
De-grittingFilter
This involves removing even smaller
solids such as sand, rocks and food
pips
≈
1. First Stage
Removing large and small solid particles in the water
Larger things
are removed first
≈
Filtering out all the unwanted things like
paper, plastics, leaves, and plant
matter.
≈
De-gritting
The grit is forced through a forced
vortex, which causes the grit to sink to
the bottom of a grit removal chamber.
Filter
≈
1. First Stage
Removing large and small solid particles in the water
Larger things
are removed first
≈
Filtering out all the unwanted things like
paper, plastics, leaves, and plant
matter.
≈
De-gritting
The grit is forced through a forced
vortex, which causes the grit to sink to
the bottom of a grit removal chamber.
Filter
≈
1. First Stage
Removing large and small solid particles in the water
Larger things
are removed first
≈
Filtering out all the unwanted things like
paper, plastics, leaves, and plant
matter.
≈
De-gritting
The grit is forced through a forced
vortex, which causes the grit to sink to
the bottom of a grit removal chamber.
Filter
≈
1. First Stage
Removing large and small solid particles in the water
Larger things
are removed first
Filtering out all the unwanted things like
paper, plastics, leaves, and plant
matter.
≈
De-gritting
The grit is forced through a forced
vortex, which causes the grit to sink to
the bottom of a grit removal chamber.
Filter
2. Second Stage
The water undergoes coagulation and flocculation
2. Second Stage
The water undergoes coagulation and flocculation
Coagulant
Alum is added to the water
A substance that sticks and clumps particles
together
2. Second Stage
The water undergoes coagulation and flocculation
Coagulant
The unwanted particles are stuck
together, and the resulting clump
of particles something called a
‘floc’.
The unwanted particles are stuck
together, and the resulting clump
of particles something called a
‘floc’.
2. Second Stage
The water undergoes coagulation and flocculation
Coagulant
The unwanted particles are stuck
together, and the resulting clump
of particles something called a
‘floc’.
2. Second Stage
The water undergoes coagulation and flocculation
Coagulant
The unwanted particles are stuck
together, and the resulting clump
of particles something called a
‘floc’.
2. Second Stage
The water undergoes coagulation and flocculation
Coagulant
A lot of floc is formed
The unwanted particles are stuck
together, and the resulting clump
of particles something called a
‘floc’.
2. Second Stage
The water undergoes coagulation and flocculation
Coagulant
A lot of floc is formed
Clog the filters!
2. Second Stage
The water undergoes coagulation and flocculation
Coagulant
A lot of floc is formed
Clog the filters!
Filters are backwashed every 24
hours to remove any floc that has
accumulated.
The unwanted particles are stuck
together, and the resulting clump
of particles something called a
‘floc’.
The water is disinfected by
adding chlorine.
3. Third Stage
Microorganisms are removed and the water is enhanced
This will kill any
microorganisms,
bacteria, viruses,
and parasites still
in the water
The water is disinfected by
adding chlorine.
3. Third Stage
Microorganisms are removed and the water is enhanced
Next, fluoride is added to reduce
dental cavities, and lime is added to
adjust the pH of water.
This will kill any
microorganisms,
bacteria, viruses,
and parasites still
in the water
How does each stage of the water
treatment process reduce the risk of
infection from pathogens?
Stage 1 Stage 2 Stage 3
The removal of large solids
via screening and de-gritting
The coagulation, flocculation,
and filtering of suspended
solids.
Kill any bacteria, viruses and
parasites by adding chlorine
There is little doubt that these
large particles in the water affect
the quality of water.
They can carry microbes, so
when you remove these
particles, you remove the
microbes.
These suspended solids generally
include organic substances and
nutrients. This is really good for
bacteria and is what they usually
feed on. By removing these
suspended solids, we remove the
bacteria’s food sources for
bacteria.
Not only will this remove the
bacteria, but there will be a much
lower chance for bacteria to grow
and multiply.
Fluoride is added to strengthen our
teeth and reduce tooth decay and
cavities. When we drink tap water, it
protects us against the harmful
plaque-forming microbes that
lurk in our mouths.
The pH change due to lime. This is
actually added to minimize
corrosion in the plumbing
Stage 1 Stage 2 Stage 3
Water undergoes quite a rigorous process that
ensures that every contaminant and pathogen is
gone by the time it reaches our taps.
As long-winded as this process is, it is crucial in minimising any
risk of infections by ensuring that our water is clean

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HSC Biology 3.2: Treatment of water

  • 1. HSC Biology • Module 3: The Search For Better Health 1. Over 3000 years ago the Chinese and Hebrews were advocating cleanliness in food, water and personal hygiene 1. • Gather, process and analyse information from secondary sources to describe ways in which drinking water can be treated and use available evidence to explain how these methods reduce the risk of infection from pathogen 2. Students:
  • 2. Water Cleaning water is more difficult than cleaning food! Water is everywhere and can easily be contaminated with the many microorganisms and microbes flying around.
  • 3. Pathogens in our drinking water can cause some serious illnesses 😷 💀 🤒 💀
  • 4. Pathogens in our drinking water can cause some serious illnesses Very important 😷 💀 🤒 💀
  • 5. Most developing countries have a poor health system, and poor water treatment and sewage process Haiti Chad Ethiopia Afghanistan India Laos Cambodia Most developing countries have a poor health system, and poor water treatment and sewage process
  • 6. Most developing countries have a poor health system, and poor water treatment and sewage process Haiti Chad Ethiopia Afghanistan India Laos Cambodia Most developing countries have a poor health system, and poor water treatment and sewage process Those highest at risk from contaminated water are generally young children since their immune systems are not strong enough to fight against waterborne diseases
  • 7.
  • 9. 1. First Stage Removing large and small solid particles in the water
  • 10. ≈ 1. First Stage Removing large and small solid particles in the water Contains waste and a lot of large solid particles
  • 11. ≈ 1. First Stage Removing large and small solid particles in the water Larger things are removed first
  • 12. ≈ 1. First Stage Removing large and small solid particles in the water Larger things are removed first ≈ Filtering out all the unwanted things like paper, plastics, leaves, and plant matter. Filter
  • 13. ≈ 1. First Stage Removing large and small solid particles in the water Larger things are removed first ≈ Filtering out all the unwanted things like paper, plastics, leaves, and plant matter. ≈ De-grittingFilter This involves removing even smaller solids such as sand, rocks and food pips
  • 14. ≈ 1. First Stage Removing large and small solid particles in the water Larger things are removed first ≈ Filtering out all the unwanted things like paper, plastics, leaves, and plant matter. ≈ De-gritting The grit is forced through a forced vortex, which causes the grit to sink to the bottom of a grit removal chamber. Filter
  • 15. ≈ 1. First Stage Removing large and small solid particles in the water Larger things are removed first ≈ Filtering out all the unwanted things like paper, plastics, leaves, and plant matter. ≈ De-gritting The grit is forced through a forced vortex, which causes the grit to sink to the bottom of a grit removal chamber. Filter
  • 16. ≈ 1. First Stage Removing large and small solid particles in the water Larger things are removed first ≈ Filtering out all the unwanted things like paper, plastics, leaves, and plant matter. ≈ De-gritting The grit is forced through a forced vortex, which causes the grit to sink to the bottom of a grit removal chamber. Filter
  • 17. ≈ 1. First Stage Removing large and small solid particles in the water Larger things are removed first Filtering out all the unwanted things like paper, plastics, leaves, and plant matter. ≈ De-gritting The grit is forced through a forced vortex, which causes the grit to sink to the bottom of a grit removal chamber. Filter
  • 18. 2. Second Stage The water undergoes coagulation and flocculation
  • 19. 2. Second Stage The water undergoes coagulation and flocculation Coagulant Alum is added to the water A substance that sticks and clumps particles together
  • 20. 2. Second Stage The water undergoes coagulation and flocculation Coagulant The unwanted particles are stuck together, and the resulting clump of particles something called a ‘floc’.
  • 21. The unwanted particles are stuck together, and the resulting clump of particles something called a ‘floc’. 2. Second Stage The water undergoes coagulation and flocculation Coagulant
  • 22. The unwanted particles are stuck together, and the resulting clump of particles something called a ‘floc’. 2. Second Stage The water undergoes coagulation and flocculation Coagulant
  • 23. The unwanted particles are stuck together, and the resulting clump of particles something called a ‘floc’. 2. Second Stage The water undergoes coagulation and flocculation Coagulant A lot of floc is formed
  • 24. The unwanted particles are stuck together, and the resulting clump of particles something called a ‘floc’. 2. Second Stage The water undergoes coagulation and flocculation Coagulant A lot of floc is formed Clog the filters!
  • 25. 2. Second Stage The water undergoes coagulation and flocculation Coagulant A lot of floc is formed Clog the filters! Filters are backwashed every 24 hours to remove any floc that has accumulated. The unwanted particles are stuck together, and the resulting clump of particles something called a ‘floc’.
  • 26. The water is disinfected by adding chlorine. 3. Third Stage Microorganisms are removed and the water is enhanced This will kill any microorganisms, bacteria, viruses, and parasites still in the water
  • 27. The water is disinfected by adding chlorine. 3. Third Stage Microorganisms are removed and the water is enhanced Next, fluoride is added to reduce dental cavities, and lime is added to adjust the pH of water. This will kill any microorganisms, bacteria, viruses, and parasites still in the water
  • 28. How does each stage of the water treatment process reduce the risk of infection from pathogens?
  • 29. Stage 1 Stage 2 Stage 3 The removal of large solids via screening and de-gritting The coagulation, flocculation, and filtering of suspended solids. Kill any bacteria, viruses and parasites by adding chlorine There is little doubt that these large particles in the water affect the quality of water. They can carry microbes, so when you remove these particles, you remove the microbes. These suspended solids generally include organic substances and nutrients. This is really good for bacteria and is what they usually feed on. By removing these suspended solids, we remove the bacteria’s food sources for bacteria. Not only will this remove the bacteria, but there will be a much lower chance for bacteria to grow and multiply. Fluoride is added to strengthen our teeth and reduce tooth decay and cavities. When we drink tap water, it protects us against the harmful plaque-forming microbes that lurk in our mouths. The pH change due to lime. This is actually added to minimize corrosion in the plumbing
  • 30. Stage 1 Stage 2 Stage 3 Water undergoes quite a rigorous process that ensures that every contaminant and pathogen is gone by the time it reaches our taps. As long-winded as this process is, it is crucial in minimising any risk of infections by ensuring that our water is clean