Chemical Process
Phenol formaldehyde

Is an abrasive material
Is a monomer
Employs condensation polymerisation
Employs addition polymerisation

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Chemical Process
Presence of carbonaceous matter in the sewage

Reduces sulphate ions to sulphides causing obnoxious smell
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Increases the quantity of chlorine used for its purification
All of these

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