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Polyaluminium chloride (PAC) is an important flocculation in water treatment. O’Melia and Dempsey (1982), in a review of work done using a wide variety of PAC coagulants, proposed that some PAC for-mulations may contain aluminum precipitates.
aluminium sulphate has been in operation for over a hundred years all over the world. The use of alum as a coagulant for water treatment often leads to higher concentrations of aluminium in the treated water than in the raw water itself.
