Water Pollution

Question 1

Water pollution sources

Answer 1

Persticides and inorganic chemicals
Thermal pollution

Question 2

Pesticides and inorganic materials examples

Answer 2

Pesticides like DDt
MEtals like zince ,copper from industrial waste
Oil from ships leakage

Question 3

Thermal pollution

Answer 3

increase in water temprature decrease dissolved oxygen

Question 4

solution of thermal pollution

Answer 4

is to store hot water in cooling ponds before discharging it to the sea

Question 5

Eutrophication

Answer 5

The enrichment of water bodies with nutrients causes Entrophication of the water body

Question 6

Methods for Control of Water Pollution and Water Recycling

Answer 6

 Water Recycling
 Wastewater Treatment
 Control of Water Pollution

Question 7

Water treatment main stages

Answer 7

pretreatment - bar sceen (removes large solid substances)

Primary :
1- gritt tank -sewage flow slowly thru so that particles settle down
2-Settling tank- the sludge settles down and scum floats

secondary :
3-Aeration tank - air blower generate bubbles which helps bacteria to grow and to feed on organic contaminants.
4- digester - sludge3 is decomposed b anerobic baccteria 0 biogass is produced
5-clarifier - sludge is settled out by gravity
6- the leftover waste water is treated by chlorine to remove the phosphorus compounds

The residue obtained from primary treatment one known as sludge

Question 8

measures to control water pollution

Answer 8

water requirement should be minimized by altering the
techniques

Water should be reused with or without treatment.

Recycling of water after treatment should be practiced

The quantity of wastewater discharge should be minimized.

Question 9

Water pollution Solutions

Answer 9

Chlorination
Public awareness
URBAN AND INDUSTRIAL WASTE WATER TREATEMENT
Enforcing existing laws

Question 10

Industrial waste water treatment

Answer 10

chemical proccess (remove ca from &minerals to soften water - bubbling co2 into water to address water ph)

Physical process-simple filtration

Removal of heavy metals (Oxidation , Lime treatment ,Electrodeposition

Question 11

Sludge

Answer 11

Produced during waste water treatment

ALUM SLUDGE

Treatment - heat treatment , sludge dewatering ,anerobic digestion

Question 12

Sources

Answer 12

point source - pollution occur when pulluting substance is emitted directly into the water way

nonpoint source - occurs when there is a runoff of pollutants into a waterway

Question 13

aquifer

Answer 13

is underground layer of water bearing a permeable rock

Pumping underground water quickly can pump up sewage that was orignally flowing downhill.

Question 14

BOD (biochemical oxygen demand)

Answer 14

is the demand for oxygen caused by any organic material that is being broken down by microbes