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Information @ a Glance

General
  • Polyaluminum chloride (PAC) of the general formula AlnCl(3n-m)(OH)m is useful as this compound have a wide range of pH value according to the subscripts n and m. The actual pH correlates to the formula m/(3n). It provides a choice for the exact pH value applications. The most common PAC for water purification is Al12Cl12(OH)24. The form of Al2Cl(OH)5 is used as a deodorant and an antiperspirant.
  • The Polyaluminum Chloride Solution product line offers a broad range of formulations that have unique performance characteristics when compared to the more conventional products like alum, aluminum chloride, ferric chloride, ferric sulfate, etc. Polyaluminum Chloride Solution is a corrosive mineral acid. Other modified PAC compounds include polyaluminum hydroxide chloride silicate (PACS) and polyaluminum hydroxide chloride silicate sulfate (PASS).

Process

  • PAC manufactured through spray drying process show features of high stability, adaptation to wide water area, quick hydrolysis speed, strong absorptivity, big flocs, quick precipitation, low turbidity out of water and superior dehydration property. Spray drying products can avoid water accident, and are more safe and reliable for drinking water.
  • Spray granulation is to dry polyaluminium chloride and atomize to be minute particle simultaneously. Polyaluminium chloride is water soluble substance and shows features of good thermal stability and high solubility. Polyaluminium chloride solution with 40-50% solid content on drying is introduced to high pressure pump, atomized in atomizer of dryer to be minute fogdrop which is then dried to be granular products.

Applications & Technology

  • An in-line coagulation (without sedimentation step)/ultrafiltration process was investigated. In the process investigated, alum or polyaluminium chloride used as coagulants proved to be more efficient in the removal of NOM (natural organic matter) from treated water and in reduction of membrane fouling, compared to ultrafiltration. Coagulation, as a pretreatment process, can substantially reduce the concentration of natural organic substances found in raw water.
  • Sand filtration (or mechanical filtration) will remove most of the solids found in pool water systems. Clarity
    can be improved by the addition of a floccing agent. Common Flocs Used are  PAC (Poly Aluminium Chloride) (Premixed Liquid or Powder),  Alum (Aluminium Sulphate) (Powder or “Rock” forms). The Charged Particles of the floccing agent are attracted to the suspended particles. The particles agglomerate and settle out of solution.
  • Polyaluminium chloride (PAC) is increasingly used for water treatment. Against the conventional use of aluminium sulphate (alum) it is showing distinct advantages. A polyaluminium chloride plant is an investment opportunity with attractive returns in a growing market. Polyaluminium chlorides are synthetic polymers dissolved in water. They react to form insoluble aluminium poly-hydroxides which precipitate in big volumetric flocs.

Report

  • It is reported that New Age coagulants such as aluminium chlorohydrate (ACH) and polyaluminium chloride (PACl) do not have as great an effect as does alum. Organic coagulants generally do not effect the raw water alkalinity and pH; which can be an advantage in some cases

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