REVIEWOF DRINKING WATER TREATMENT COAGULANTS
ReportNo WSAA 200
This summarypresents the findings of a study commissioned by the Water Services Associationof Australia and carried out by Gutteridge Haskins & Davey Pty Ltd to reviewcoagulants in drinking water treatment.
REVIEW OF COAGULANTS
It is concludedthat:
· Ferricchloride, ferric sulfate and PACI can generally offer similar performance toalum.
· Promisingnew coagulants are hydroxylated ferric sulfate and poly ferric chloride. Trialswith poly ferric chloride are planned in South Australia.
· Organicpolymers are generally suitable for water with high turbidity and low colour.They also perform well as a coagulant aid in conjunction with an inorganiccoagulant (metal salt), reducing inorganic coagulant dose requirements. Organicpolymers are generally not appropriate for highly coloured waters.
· Coagulantperformance is highly dependent on raw water quality characteristics. Bench andpilot tests are required to evaluate alternative coagulants.
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