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Drinking Water

The use of chemicals within the clarification process for potable water are required for the removal of turbidity, colour and solids. The primary coagulants extensively used are either aluminium or iron based products which are generally aluminium sulphate, polyaluminium chloride or ferric sulphate.  In order to optimise the pH for these processes alkalis are employed, and to inhibit the formation of THM - inorganic acids (usually sulphuric acid) - are introduced into the process. Liquid polymers like polydadmac can be used for washwater recovery and for the dewatering of the sludges polyacrylamides are generally utilised.

For disinfection process chlorine or chloramines are introduced into the water after clarification and to reduce plumbosolvency orthophosphoric or monosodium phosphate are utilised.