17.  Aspects Regarding the Efficiency of Coagulation Process for Some Surface Waters

Authors: E. Zamfiroiu, S. Masu


Abstract:

Coagulation is characterized through phenomenon of colloidal particles aggregation, settling and absorption onto formed aggregates of decayed natural organic matter, NOM. Fe and Al salts are coagulation reagents efficient in optimal doses, used in traditional coagulation based on stoichiometric relations and a mechanism of charge neutralization, respectively active sweep flocculation when coagulant excess act through absorption and charge neutralization mechanisms. Ferric chloride is more efficient than aluminum sulphate. Aluminum polymers (aluminum polychloride) are more efficient than monomeric species of Al and Fe, having higher efficiency on lower optimal dozes. Choosing the coagulant must be based more on scientific information, than in Jar-Test performances.


Keywords: coagulation, NOM, Fe and Al salts

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