Sewage treatment Dosage sequence of flocculant

In the process of sewage treatment or Water Treatment Chemicals, flocculants are commonly used chemical agents to help suspended particles or colloidal substances in water gather into larger floc, so as to facilitate subsequent precipitation, filtration and other treatment processes. When a variety of flocculants are used, the choice of adding order becomes particularly important, because it directly affects the quality of the flocculation effect.

 

For the use of inorganic flocculants and organic flocculants, in general, inorganic flocculants should be added first, and then organic flocculants. This is because inorganic flocculants (such as aluminum salts, iron salts, etc.) can be rapidly hydrolyzed into colloids in water, which have a large specific surface area and adsorption capacity, and can adsorb suspended particles or colloidal substances in water to form smaller floc. However, these initially formed flocs are often not stable enough and are easy to be broken up during subsequent processing.