4. Water Treatment to spec

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Last updated: May 17, 2025

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Hint	Answer
Water treatment	1. Sedimentation
Water treatment	2. Screens
Water treatment	3. Aeration
Water treatment	4. Coagulation and flocculation
Water treatment	5. Clarification
Water treatment	6. Filtration
Water treatment	6.5 Desalination
Water treatment	7. Carbon treatment
Water treatment	8. Sterilisation
Water treatment	9. pH adjustment
Water treatment	10. Ion exchange
Contaminants	Litter
Contaminants	Suspended solids
Contaminants	Metals
Contaminants	Odours
Contaminants	Organic pollutants
Contaminants	Salts
Contaminants	Pathogens
Screen types (2)	Grills, mesh
Purpose of aeration	Ammonia stripping
Purpose of aeration	Decarbonisation
Purpose of aeration	Oxidise dissolved metals
Requirement for C+F	Electrostatic charges make particles repel
Coagulation	Neutralises
Flocculation	Binds
Coagulant example	Aluminium sulfate
Filtration flows through (2)	Gravel, sand
Carbon treatment	Organic chemicals adsorb onto activated carbon filter
pH adjustment	Crushed lime filter
Ion exchange	Toxic ions adsorb onto polymer beads
Reverse osmosis	Filtration through partially permeable membrane

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