Treatment of anionic emulsion systems using chitosan, polyacrylamide, and aluminum sulfate
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, filtration, and various membrane techniques, and can cause severe problems in the step of biological treatment. The objective of the prese...
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1999
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01610457_v21_n5_p354_Pinotti http://hdl.handle.net/20.500.12110/paper_01610457_v21_n5_p354_Pinotti |
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| Sumario: | 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, filtration, 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 performance of three destabilizers: chitosan, polyacrylamide, and aluminum sulfate to flocculate an O/W emulsion formulated with different emulsifiers (sodium dodecyl sulfate and sodium tetradecyl sulfate). Experiments were performed on a model system constituted by sunflower oil/water emulsions. Methods used were turbidimetry, colloidal titration, and microscopic observation. Results showed that the increase of surfactant chain length increases the destabilizer dose necessary to produce destabilization and reaching zero charge. In chitosan and polyacrylamide treatments, redispersion was observed for both sodium dodecyl sulfate and sodium tetradecyl sulfate emulsions. In the case of treatment with aluminum sulfate, turbidity values remained nearly constant, showing that redispersion does not take place in this case. |
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