Topic 5
Pollution Management
5.4 Eutrophication
What is Eutrophication?
Water body receives too much nitrogen and/or phosphorus

Algal blooms occur due to increased nutri...
The Symptoms of Eutrophication
• Increased turbidity
• Increased
sedimentation, reducing water
flow, filling in lakes
• De...
The Impacts of Eutrophication
• Economic losses to farmersdueto loss of
fertiliser from soil
• Health effects from drinkin...
Management Strategies
1. Altering human activities:
– Avoid over-use of artificial fertilisers
– Match fertiliser use care...
Management Strategies
2. Clean-up:
– Removal of nutrients by precipitation (e.g. aluminium
or iron salts can be added in o...
Management Strategies
3. Regulation (and public campaigns):
– Introduction of phosphate-stripping at sewage
works (by biol...
Questions
1. Outline the process of eutrophication
2. Evaluate the impacts of eutrophication
3. Describe three different p...
Upcoming SlideShare
Loading in...5
×

Summary of topic 5.4

548
-1

Published on

IB Environmental Systems and Societies

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
548
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
12
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Summary of topic 5.4

  1. 1. Topic 5 Pollution Management 5.4 Eutrophication
  2. 2. What is Eutrophication? Water body receives too much nitrogen and/or phosphorus Algal blooms occur due to increased nutrient availability Increased levels of phytoplankton and algae cut off light to submerged plants Decomposition of plant material and build up of bacterial populations Oxygen levels in the water body fall significantly and it becomes anoxic and unable to support life
  3. 3. The Symptoms of Eutrophication • Increased turbidity • Increased sedimentation, reducing water flow, filling in lakes • Decreased dissolved oxygen concentration • Decreased biodiversity of primary producers. Loss of submerged macrophytes • Toxic cyanobacterial blooms • Decreased biodiversity of consumers: fish population dominated by surface-dwellers such as pike and perch http://www.youtube.com/watch?v=0JnKkit5ocI
  4. 4. The Impacts of Eutrophication • Economic losses to farmersdueto loss of fertiliser from soil • Health effects from drinking nitrate-rich water (some disputed links to increased rates of stomach cancer and blue baby syndrome) • Loss of water bodies as a public amenity and scarring of the landscape • Loss of biodiversity
  5. 5. Management Strategies 1. Altering human activities: – Avoid over-use of artificial fertilisers – Match fertiliser use carefully to the crop – Reduce use of fertilisers between mid-September and midFebruary when leaching rates are highest (in the Northern Hemisphere) – Give preference to leguminous plants – their roots fix nitrogen and reduce dependence on fertiliser – Match fertiliser use carefully to the crop – Do not apply fertiliser or keep animals close to water bodies – Do not plough-up grassland (this released nitrogen) – Use flat terrain for crops to reduce loss through leaching
  6. 6. Management Strategies 2. Clean-up: – Removal of nutrients by precipitation (e.g. aluminium or iron salts can be added in order to produce phosphate precipitates which can be easily removed and disposed of) – Removal of nutrient-rich sediments (e.g. by dredging) – Removal of biomass from affected water bodies (e.g. removal of predatory fish to allow primary consumers to recover) – Prevention of point-source pollution which is known to be responsible for eutrophication (e.g. nutrient stripping of effluents, or improved treatment of sewage effluents to remove nutrients)
  7. 7. Management Strategies 3. Regulation (and public campaigns): – Introduction of phosphate-stripping at sewage works (by biological nutrient removal or precipitation) – Switching to phosphate-free detergents – Using washing machines only for full-loads – Reduced use of fertilisers on lawns and public places – Punishments for not collecting animal poo – Compost organic waste rather than send it to landfill
  8. 8. Questions 1. Outline the process of eutrophication 2. Evaluate the impacts of eutrophication 3. Describe three different pollution management strategies with regard to eutrophication
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×