13 Water Purification: Chemical Treatment: Methods

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  • Why is aluminium sulphate used in water treatment?
  • Water treatment using aluminium sulphate (VI) generally increases the percentage of dissolved, low molecular weight, polyaluminium species that are chemically reactive and possibly more readily absorbed [ 4 ]. Aluminium has been found in the brain of Alzheimer’s patients in the amyloid deposits characteristic of this disease.
  • Does coagulation with aluminium sulphate reduce pH?
  • The highest amounts of aluminium remaining in colloidal form were found in water after coagulation with aluminium sulphate (VI), which undergoes acid hydrolysis and decreased the pH of treated water in the range from 7.47 to 7.12 providing good conditions for the formation of Al (OH) 3.
  • Why is aluminium salt a problem in water treatment?
  • Besides the large amount of sludge produced, high level of aluminium remaining in the treated water has raised concern on public health. Previous research has pointed out that the intake of large amount of aluminium salt may contribute to the development of neurodegenerative diseases.
  • What happens when aluminium sulphate is added to water?
  • Aluminium sulphate (VI) and sodium aluminate, when added to water, first undergo dissociation and then their cations hydrolysis. Aluminium sulphate (VI) after introduction into water and dissolution undergoes acid hydrolysis and only in a small range of pH from 6.8 to 7.2 it forms flocs.