here i cover eutrophication topic. we all know its a threat to environment . here i also mention the negative and positive impact of it. i didn't cover all the aspects of it. but here i give graphical representation so it is easy to understand.

1. Eutrophication

2. Made by :
Farzana Aktar Lubna

3. What is Eutrophication ?
▪ In Eutrophication “Eu” means “well” “trope” means “nourishment”
▪ It begins with the addition of excess nutrients to a freshwater
ecosystem.
▪ Can be a natural process BUT is usually anthropogenic.

4. Type of Eutrophication
▪ Natural Eutrophication
 Caused by normal process.
 Takes many years to effect the water bodies in a full force.
▪ Cultural Eutrophication
 Caused by human activities.
 More alarming than the natural process.

5. Sources of Eutrophication
Sources
Point sources
Industrial
sources
Power plant
Sewage
treatment
plant
Non-point
sources
Agricultural
Urban
sources
Fossil fuel

6. Causes of Eutrophication
Causes of
Eutrophication
Natural run-off
from soil ,
inorganic
fertilizer ,
manures
Erosion
Discharge of
detergents
Domestic and
industrial
waste
Discharge of
partially
treated or
untreated
sewage
Animal waste
and sediments
entering into
water

7. Eutrophication in six stages
Addition of nitrates
Growth of plants
Death of plants
Growth of bacteria
Lack of oxygen
Suffocation

8. Impacts of Eutrophication
Impacts
Negative
impacts
Ecological
Human
health
Socio-
economic
Positive
impacts
Improves
diversity
Boosts
ecotourism
Source of
fish food

9. Prevention
 Reduction in the use of phosphates as builders in detergents.
 Reduction in the use of nitrate containing fertilisers.
 Implementation of tertiary sewage treatment methods which
remove phosphate and nitrate.
 Improvements in agricultural practices.
 Restoration of natural wetlands, efficient in nutrient removal
 Removing phosphate-rich sediments by dredging.

10. Control
▪ Waste water must be treated before its discharged into water.
▪ Algal bloom should be removed upon death.
▪ Physiochemical methods can be adopted to remove dissolved
nutrients.

11. Conclusion
“When you can’t breath
Nothing else is matters”

12. Any query? ………