Page 28 - Ranger PT3 2022 science

Science PT3 Chapter 5 Water and Solution

Process Function

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• Removes impurities such as leaves, rubbish and others
Filtration

• Adds oxygen to eliminate bad odour and taste
Oxidation

• Alum is added to coagulate suspended particles
Coagulation • Slaked lime is added to reduce the acidity of water

Sedimentation • Suspended particles deposit at the bottom of the tank

Filtration • The sand filter removes remaining impurities

• Chlorine is added to kill microorganisms
Chlorination and • Sodium fluoride is added to prevent tooth decay
fluoridation

Water Sustainability
Form 2
Water pollutant Ways to overcome

Chemicals used in
Form 2
agriculture such as chemical Use fertilisers and pesticides that are
biodegradable
fertilisers and insecticides

Domestic wastes such as
sewage wastes, animal carcasses Improve the sewerage system
and various types of rubbish

Industrial wastes such as Enforce the laws to ensure that
chemical wastes, plastics industrial wastes are not discarded into
and heavy metals the rivers

Oil slicks from ships and Clean up the oil spillage at sea
factories

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