positive displacement blower on VFD, D. O. Controlled

1. Water pollution

2.  Water pollution is the contamination of water bodies.
 The form of environmental degradation occurs when
pollutants are directly or indirectly discharged into
water bodies without adequate treatment to remove
harmful compounds.
 Water pollution affects the entire biosphere plants and
organisms living in these bodies of water.
 In almost all cases the effect is damaging not only to
individual species and population but also to the
natural biological communities.

3. Categories of water pollution
Surface water seeps through the soil and becomes
ground water
Conversely ground water can also feed surface water
sources.
we think of huge oceans, lakes and rivers. Water
resources like these are called surface waters.
A great deal of water is held in underground rock
structures known as aquifers, which we cannot see and
seldom think about. Water stored underground in
aquifers is known as groundwater.

4.  Aquifers feed our rivers and supply much of our
drinking water.
 Surface water and groundwater are the two types of
water resources that pollution affects.

5.  There are also two
different ways in which
pollution occur. If
pollution comes form a
single location such as a
discharge pipe attached
to a factory it is known as
point- source pollution.

6.  A great deal of water
pollution happens not
form one single sources
but form many different
scattered sources. This
is called nonpoint-
source pollution.

7. What are the causes of water
pollution
 Most water pollution doesn’t begin in the water itself.
Take the oceans around 80 percent of ocean pollution
enters out seas form the land.
 When farmers fertilize the fields the chemicals they
use are gradually washed by rain in to he ground water
or surface water nearby.

8. Waste water
 A few statistics illustrate the
scale of the problem that
waste water can cause.
 Around half or all ocean
pollution is cause by sewage
and waste water.
 Each year, the work generates
perhaps 5-10 billion tons of
industrial waste, much of
which is pumped untreated
in to rivers, oceans, and other
waterways.

9. Chemical waste
 detergents are relatively mild
substances.
 At the opposite end of the
spectrum are highly toxic
chemicals such as
polychlorinate biphenyls.
 They were carried there
through the oceans,
thousands of miles form
where they originally entered
the environment.

10. Radioactive waste
 The biggest sources of
radioactive pollution in
Europe are two factories that
reprocess waste fuel from
nuclear power plants.
 Radioactive waste water into
the sea, which ocean currents
then carry around the world

11. Other forms of pollution
 These are the most common
forms of pollution but by no
means the only ones. Heat or
thermal pollution form factories
and power plants also causes
problems in rivers
 Another type of pollution
involves the disruption of
sediments that flow from rivers
into the sea.
 Dams built for hydroelectric
powers or water reservoirs can
reduce the sediment flow.

12. Remedies for water pollution
 pollution of pond water, sources of drinking water and
the water used by human being in their day today life
must be prevented. But it is too tough to control
reverine water pollution. The following remedial
measures may be taken to improve the environment.
 Sewage water must not directly poured into any water
body.
 Awareness campaigns for drinking boiled water should
be encouraged.
 Factory owners should take appropriate measures to
stop the discharge of waste into lake, rivers and
oceans.