MIHAELA MIHAI, GABRIEL DABIJA, CRISTINA COSTACHE, DANUT -IONEL VAIREANU<br>Anionic Polymer - Cationic Surfactant Complex Used in the Coagulation  and Flocculation Processes

MIHAELA MIHAI, GABRIEL DABIJA, CRISTINA COSTACHE, DANUT -IONEL VAIREANU
Anionic Polymer - Cationic Surfactant Complex Used in the Coagulation and Flocculation Processes

Abstract:

The removal of kaolin fine particles from water by precipitation with polyelectrolyte and surfactant complex of polyacrylamide and hexadecyl trimethyl ammonium bromide (HTAB) was experimentally studied. The experiments have been carried out with a complex solution having the surfactants concentration higher than the critical aggregation concentration - cac, and the amount added corresponded to the potential z equal with zero. By using video microscopy and image analysis method, the kinetics of the flocculation process has been studied. The results showed the optimal duration of the flocks to be formed. The sedimentation velocity of the flocks, the sludge volume as well as the initial and final turbidity of the suspension samples has been measured. The efficiency of the process when the complex reactant was used as coagulant is compared with that obtained in same conditions in which only Praestol 2515 polyelectrolyte was used. The experimental results show that both coagulants fulfill the standard turbidity conditions for drinking water. In both cases, the separation efficiency and the sludge volume are the same. The coagulant doses showed a significant reduction when the complex is used as coagulant. In comparison with the case when only the Praestol 2515 was used, the polymer-surfactant complex formed large flocks, greater sedimentation rate and shortened flocculation duration. Keywords: kaolin, polyacrylamide, hexadecyl trimethyl ammonium bromide (HTAB)

Issue: 2010, Volume 61, Issue 5

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