This ppt describes about basics of waste water treatment

1. WASTE WATER
TREATMENT
 PROCESS
 SOURCES
 LEVELS OF TREATMENT
 NEED FOR TREATMENT
 EFFECTS OF
POLLUTANTS
 BENEFITS
 METHODS

2. It's necessary to use these
question tags irrespective of
any activities:
What ?
Which ?
Where ?
Why ?

3. Waste Water Treatment
What is waste water treatment?
It is a process used to remove
contaminants from wastewater and
convert it into an effluent that can be
reused for various purposes.
Pollutants are removed, converted or
broken down during this process.
Which substances were being treated
in this process?
 Solid wastes
 Human waste
 Stormwater
 Domestic waste

4. Waste Water Treatment
Where this process takes place?
This takes place in Waste Water
Treatment Plant(WWTP).
In case of domestic waste water
treatment, it is referred as Sewage
Treatment Plant(STP).
Why this process is so important ?
 It is very important to get the proper
treatment of the water for a healthy
living.
 This treatment saves many people
from losing their lives due to fatal
disease such as typhoid, cholera,
etc.,.

5. Sources of Wastewater
 Agricultural waste
 Domestic waste
 Industrial waste

6. Levels of Waste
Water Treatment
 Preliminary treatment includes filtering wastewater
through fine screens and then through grit chambers
 Primary treatment includes removal of sand and grit that
has fallen at the bottom of sedimentation tank also called
as primary sedimentation
 Secondary treatment process removes carbonaceous
organic matter and nutrients (nitrogen and phosphorus)
from wastewater through aeration tank and secondary
sedimentation takes place.
 Tertiary treatment includes filtering, disinfecting and
preparing wastewater for recycling.
Preliminary
Primary
Secondary
Tertiary
Secondary Treatment

7. Need for Waste
Water Treatment:
There are a lot of good reasons why keeping our water clean is an
important priority:
FISHERIES: Clean water is critical to plants and animals that live in
water. This is important to the fishing industry, sport fishing
enthusiasts, and future generations.
WILDLIFE HABITATS: Our rivers and ocean waters teem with life
that depends on shoreline, beaches and marshes. They are critical
habitats for hundreds of species of fish and other aquatic life.
Migratory water birds use the areas for resting and feeding.
HEALTH CONCERNS: If it is not properly cleaned, water can carry
disease. Since we live, work and play so close to water, harmful
bacteria have to be removed to make water safe.

8. Effects of Waste Water Pollutants:
Water pollution: Fresh water bodies and marine waters into which wastewater is discharged may be
polluted and rendered unsafe for human use. Depending on what is discharged, aquatic life may be harmed
too.
Water security:There is water scarcity in many places in the world. Wastewater discharged on lands can
leach into underground water tables and potentially contaminate aquifers and underground water.
Ecosystem services:
All ecosystems are connected and they all ultimately depend on water. Similarly, all water (surface and
underground) is connected. This means careless wastewater discharge can have some serious ripple
effect. If one part of the ecosystem chain is destroyed, it can upset its entire food chain.
Agriculture:Wastewater for irrigation may contain unsuitable chemicals and higher concentrations of
nutrients needed for crops. This can result in delayed and under yielding.

9. Contd...,
Most importantly,
Health of urban and rural populations:
Wastewater is a big health issue, as it carries and transports a myriad of
diseases and illnesses. It is believed that about 2.2 million people die each
year (globally) from diarrhoeal disease. (WHO) At least 1.8 million children
under five years die every year due to water related disease, or one every 20
seconds (WHO, 2008).
The best known example is mercury pollution in the oceans took place in
1938 when a Japanese factory discharged a significant amount of mercury
into Minamata Bay, by contaminating the fish stocks there. It took several
years to show its effects.
MINAMATA DISEASE:
 first discovered in the city of Minamata, Kumamoto Prefecture,
Japan, in 1956.
caused by the release of methylmercury in the
industrial wastewater from a chemical factory

10. Benefits:
Maintaining clean and usable water.
Helps in recharging ground water.
Helps in preventing the spread of
hazardous diseases.
Improving the environmental hygiene.
Can be used as a part of energy
production.
Reuse purpose:
Treated wastewater can be reused for
industrial activities,landscaping works, toilet
flushing,highway landscaping,etc.,.

11. Methods of Waste Water
Treatment
Physical method
Chemical method
Biological method

12. Thank you...!!!