Treatment of Anionic Emulsion Systems Using Chitosan, Polyacrylamide and Aluminum Sulfate.

PINOTTI, A.E. ; BEVILACQUA A.; ZARITZKY N. E.

SCANNING

JOHN WILEY & SONS INC

Lugar: New York; Año: 1999 vol. 21 p. 354 - 358

0161-0457

The presence of emulsified oil in waste water of the edible fats industry can interfere with many tertiary or advanced waste water treatments such as adsorption, fil-tration, and various membrane techniques, and can cause severe problems in the step of biological treatment. The objective of the present work was to compare the perfor-mance of three destabilizers: chitosan, polyacrylamide, and aluminum sulfate to flocculate an 01W emulsiOn for-mulated with different emulsifiers (sodium dodecyl sulfate and sodium tetradecyl sulfate). Experiments were per-formed on a model system constituted by sunflower oil/ water emulsions. Methods used were turbidimetry, col-loidal titration, and microscopic observation. Results showed that the increase of surfactant chain length increases the destabilizer dose necessary to produce desta-bilization and reaching zero charge. In chitosan and poly-acrylamide treatments, redispersion was observed for both sodium dodecyl sulfate and sodium tetradecyl sulfate emul-sions. In the case of treatment with aluminum sulfate, tur-bidity values remained nearly constant, showing that redispersion does not take place in this case.