Water Pollution

1
Water Pollution
2
(No Transcript)
3
Water pollution are mainly caused by1.Organic
pollution2.Inorganic Nutrient pollution3.Chemica
l pollution4.Oil pollution5.Thermal pollution
4
A.Organic pollution

• The pollution mainly from domestic sewage, manure
  of chicken and pigs from farms and wastes from
  factories.
• The discharge of organic wastes into streams
  provides abundant food for the rapid growth of
  putrefying bacteria and fungi. They use up the
  dissolved oxygen and release toxic wastes.It will
  kill the fish.

5
B. Inorganic nutrients pollution

• The discharges of inorganic fertilizers will
  provides rich inorganic nutrient to support the
  rapid growth of algae.So red tides are algae
  bloom that occurs in sea.

6
C. Chemical pollution
7

• The detergents forms a foamy layer on the surface
  that reduces the penetration of light and the
  dissolution of oxygen.
• They also contain high phosphate content . It
  will causes algae bloom.

8

• Certain chemicals, including PCBs, dioxin, and
  DDT, are very poisonous and non-biodegradable.
• These chemicals are stored in fatty tissue and
  become increasingly concentrated as they move up
  the food chain to large animals and humans.

9
(No Transcript)
10
(No Transcript)
11
D. Oil pollution

• Oil pollution is caused by accidental spillage or
  illegal washings from oil tankers or seeping from
  ships.

12

• Oil covering the water surface prevent oxygen
  from dissolving in water
• Oil soaked on the feathers of the sea birds
  prevents oxygen them from flying. It also reduce
  their insulating property to cause them die of
  clod.

13
(No Transcript)
14
E. Thermal pollution

• Hot water discharged from the cooling systems of
  the industrial plant such as a power station into
  rivers or sea will raise the water temperature.
• High temperature decrease the solubility of
  oxygen in water so that less oxygen is available
  to the aquatic organisms.

15
Solution
16
(No Transcript)
17
Ip Pui Kwan 1999-2000 6C