Polyaluminium coagulants - ACH and PACL can often give significant advantages over alum, including:

1. reduced chemical costs

2. lower residual aluminium levels in the treated water,

3. improved treated water quality including lower TDS and sulphate levels and possibly higher

CCPP values, and lower sludge production.

In many cases, post-treatment pH adjustment using an alkali is not required, reducing the overall capital cost of the plant as well as improving operator amenity and reducing maintenance requirements.

With increased competition in the marketplace, the unit cost of polyaluminium coagulants will probably decrease in the future, making conversion from alum to ACH/PACI more attractive and,more widespread in Australia.

Limited information suggests that THM formation will not be compromised when using ACH/PACI but this should be first confirmed in the laboratory with jar-tests.

Keywords: Water Treatment, PAC, Poly aluminum Chloride, poly aluminium chloride, Polyaluminum Chloride, PACL, Coagulant, Flocculant, Yellow PAC, Yellow polyaluminum chloride, White PAC, White polyaluminum chloride, PolyDADMAC, DADMAC, PDADMAC, Polydmdaac, polyelectrolyte

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