Chemical treatment for wastewater

Chemical treatment for wastewater



Chemical treatment for wastewater

 

Why it is important to choose a suitable method for wastewater treatment?

80% of wastewater  goes back to the environment without treatment causing environmental damage and sickness. 

 

Chemical Wastewater Treatment:

It is the use of chemical reactants to break down pollutants. It is perfect wastewater with high chemical toxin content, such as the wastewater from chemical or pharmaceutical manufacturing and textile manufacturers. It is also ideal for removing the heavy metals in the wastewater produced from mining. The chemical effluent treatment plants (ETPs) that treat these wastes use chemical treatment methods.

what are the Types of Pollutants that Chemical Wastewater Treatments Remove?

industries like mining, steel manufacturing, and oil and gas extraction and refining — will produce wastewater with toxic soluble metals. These industries are likely to use chemical treatment.

contaminants chemical waste management  treatments can remove:

  •     
  • Dyes: Wastewaters from paper mills and textile plants.
  •     
  • Paints and solvents.
  •     
  • Metal residues:  wastewater often include cobalt, iron, lead, aluminum, copper, mercury, nickel, and zinc. Chemical treatment breaks down the metals’ chemical structures and makes them harmless to the environment.

 

 

 

What are the steps of chemical treatment?

    

  • Coagulation: It is adding chemical substances that neutralize the charge of suspended solids and facilitate their coagulation between colloidal particles.

For example (ex: CHIMI FLOC FR 4011 which is FeCl3 (ferric chloride 40%/ Iron (III) chloride) that is produced by CHIMIART the biggest company for coagulants in the MENA region since 1977.

   

  • Flocculation: flocculation means adding chemical substances called polymer that consists of acrylamide subunits and are characterized by their high molecular weight. Its role is to combine with the coagulated waste particles to form larger, heavier, and stable flocs that can be easily removed.

Polymers are divided according to their charge:

+ Cationic polymer “positively charged”

+ Anionic polymer “negatively charged”

 

Author:

Dr.Mina Guirguis