WTCCI –Chemicals & Equipments for Waste Water Treatment:

Waste Water Treatment is all about clarifying water streams and dewatering sludges and slurries to remove solids with the help of waste water treatment chemicals through the process of coagulation and flocculation. Waste Water Treatment is usually done from start to finish through a number of steps like sedimentation, clarification & filtration. Proper Management of waste water systems is essential to ensure the protection of public and environmental health.


Coagulation is a process to eliminate the repulsive electrical charges surrounding the particles in suspension to bring them together. Generally coagulants are positively charged ions with high valence such as metal salts of aluminum & iron. Examples are aluminum as Al2(SO4)3- (alum) and iron as either FeCl3 or Fe2(SO4)3-. Ferrous Sulfate FeSO4 could also be used as coagulant provided it gets  oxidized to ferric form (Fe3+) during aeration process.Doses could vary from 10 to 90 ppm Fe3+/ L or sometimes higher. The process of Coagulation is very much dependent on the doses of coagulants, the pH and colloid concentrations. Sometimes Ca(OH)2 is employed as co-flocculant to adjust the pH level for proper coagulation.


The examples of Coagulant Aids are:

DADMAC- Poly Di-Allyl Dimethyl Quaternary Ammonium Chloride Compounds. They are effective at any pH.

EPI- epichlorohydrin/alkyl amine compounds(50%).


The next step to coagulation process is flocculation which is defined in simple terms as a process of precipitation of suspended solids from water by gravity. It can only occur once the suspended solids have been coagulated and the small masses of solids are able to come together by linking with long chain molecules of polymer flocculants resulting in their weight no longer able to be held in water. Thus the precipitation occurs. When polymer flocculants are applied, the floc formation occurs due to boding between suspended particles with the help of long chain molecule of flocculant polymer. Polymer flocculants are basically of three types depending upon the type of charge they carry namely anionic polymers(-ve) , cationic polymers(+ve) & poly ampholyte polymers which carry both +ve & -ve charges. Flocculant polymers are water-soluble and have high molecular weight ranging between 105 and 106 g/ mol. The effectiveness of flocculants is largely dependent upon their type of charge, degree of charge, their molecular weight & their molecular degree of orientation. While anionic flocculants are applied to precipitate inorganic solids such as minerals and metals, the cationic flocculants are applied to precipitate organic solids such as food and food byproducts.

At WTCCI we help our customers to select the best economical & most effective option through extensive jar testing to supply a wide range of waste water treatment chemicals in various packaging options.

Besides supplying Coagulants & Flocculants & other chemicals, we also supply Waste Water Equipments such as:

                          Filter Presses,
                          Conical Tanks,
                          Mixers &  Chemical Feed Systems
                          Chlorine dioxide generators

For your requirements please contact us at info@watertreatchemicals.com or call us at 905-796-5656

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