Chemicals used in Waste water treatment


In Waste water treatment, Coagulation and Flocculation are employed to separate suspended solids from water.



Coagulation is the destabilization of colloids by neutralizing the forces that keep them apart. Rapid mixing is required to disperse the coagulant throughout the liquid.

The most widely used coagulants are:

  1. Aluminum sulphate {Alum}
  2. Poly aluminum chloride {PAC}
  3. Ferrous sulphate
  4. Sodium Aluminate
  5. Silicon Derivatives
  6. Lime
  7. Synthetic Organic Polymers

Antifoams and Defoamers

Unwanted foaming can be problematic in many commercial, manufacturing and industrial process applications. To ensure that such systems are well maintained and operate at optimum efficiency it is essential that the correct water conditions are maintained at all times. This can be achieved using carefully selected antifoams and defoamers.

Biocides and Disinfectants

The control of microbiological activity is an important, often safety critical activity in many commercial, manufacturing and industrial process applications. Some disinfectants in use are:

  • Calcium hypochlorite/ Sodium hypochlorite
  • Sodium bromide

Boiler water treatment chemicals

It is used to manage the problems associated with the use of water including scale formation, metallic corrosion, boiler water carryover and sludge deposition. They consist of Alkalinity builders, Condensate Line Protection, Multi functional treatments, Oxygen scavengers, Scale & Corrosion inhibitors, Sludge conditioners.

Anti foulants

The accumulation of microbiological slimes, biofilm and general bio-fouling in closed circuit water systems can be problematic. It is used in closed loops and circuit systems that use water as a primary medium. They remove and disperse unwanted microbiological fouling and slimes.

Scale and corrosion inhibitors

The unwanted formation of scale and detrimental impact of metallic corrosion can be significant issues that affect the operation and maintenance of closed circuit water systems.

  • Phosphate esters
  • Phosphoric acid
  • Polyacrylic acid

Tradeasia International offers a wide range of chemicals to cater to your water treatment needs. Contact Us today if what you are looking fir is more information to select which chemical to use or to buy from us.


          – Written by

             Manikandan Jayaraj

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