Water treatment
The aluminium sulphate marketed under the trade name SUFAL® is the most commonly used coagulant in the treatment of drinking and waste water. The Al3+ cation has a high charge that produces the elimination of colloidal matter by coagulation. Coagulation efficiency is determined by the physical and chemical characteristics of the water to be treated.
The sodium aluminates manufactured at IQE under the ALNA® trade name are used as coagulants and flocculating agents at waste water treatment plants, using their high reactive alumina content. This process achieves the clarification and elimination of the colour and hardness of waste water. They have a basic pH, a property that distinguishes them from other coagulants.
It is important to highlight its great dephosphating power in phosphorus elimination processes as well as it use to remove sulfates in water, via ettringite precipitation (SAVMIN and CESR process).
Dephosphatation: In the case of SUFAL® (aluminium sulfate) and ALNA® (sodium aluminate) products, thanks to the presence of Al3+, total phosphorus is removed to desirable and legally allowable levels, as well as preventing bulking and foaming problems.
In the treatment of water for human consumption, NASIL® sodium silicates have been recognized for their capacity to reduce the amount of lead, copper and other heavy metals dissolved in water. They act by inhibiting the corrosion process in pipes, by forming a microscopic film, maintaining the water pH constant at an approximate value of 8 so that metal dissolving processes are reduced to a minimum.
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