Aluminium Sulphate has been a widely used coagulant within the water treatment industry for many years where it is used as a flocculant to remove contaminates, unwanted colours and general turbidity (haze) from water. However, this process leaves behind large traces of aluminium in water supplies which requires further filtration and results in generating vast quantities of sludge-like waste (known as water treatment residuals) which is disposed of at landfill. These disposal costs have a direct impact on the operational costs of water treatment plant so it is beneficial to seek alternatives that reduce this.

Having said that, waste treatment residuals do possess many physical and chemical properties that could also lend to them being re-used for a more sustainable purpose including use in construction materials and even soil nutrients however there are well documented concerns regarding aluminium toxicity in soil and damaging implications for ecosystems which limit this approach.

Poly Aluminium Chloride on the other hand, has been developed as an alternative. PAC hydrolyses with greater ease, obtains better coagulation, and rapidly forms flocs making this a much more efficient product. It also possesses lower doses of aluminium therefore leaving significantly fewer aluminium residuals and sludge waste product.

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