Products and Technologies

prod

Main skills of Contec are in the field of plants for water treatment products: in particular Contec has a good support by production units of inorganic coagulants and flocculants operating world-wide.
Contec has a long experience in design of coagulants plants and a continuous improvement installed in each new plant makes Contec leader in the design of inorganic coagulants plants.

These products are mainly:

  • Aluminium Sulphate liquid and solid
  • Ferric Chloride
  • Liquid Poly Aluminium Chloride at different basicity
  • Solid Poly Aluminium Chloride
  • Sodium Aluminate

All these coagulants have had and have their own specific use such us Ferric Chloride which is an excellent product for wastewater treatment applications, including phosphorus removal, sludge conditioning and also prevent odor and corrosion by controlling hydrogen sulphite formation or Sodium Alluminates used especially in papermaking industries.


Alum (aluminium sulphate) is the most commonly used coagulant in water treatment plants, low cost being its major attraction. Alum however, has a number of disadvantages:

  • limited coagulation pH range: 5.5 to 6.5,
  • supplemental addition of alkalinity to the raw water is often required to achieve the optimum coagulation pH, particularly for soft, coloured surface waters that are common in many rivers,
  • residual aluminium levels in the treated water can often exceed acceptable limits, and
  • alum floc produced is particularly fragile. This is especially important if a coagulant is required to maximise colour removal in a microfiltration-based water treatment process.

Alum reacts in water to produce aluminium hydroxide and as a by-product sulphuric acid is also formed. The metal hydroxide precipitates out of solution and entraps neutralized charged dirt particles (turbidity), as well as coagulating soluble colour and organics by adsorption.

The polyaluminium chloride is definitely the most innovative coagulant that can be modified in its action of coagulant in function of water to treat. Contec produces a wide range of polyaluminum chloride (PACl) in liquid form.