Polyelectrolytes as coagulants in the treatment of food industry waste
A series of seven commercial copolymers of acrylamide (polyelectrolytes of the Zetag and Magnafloc series from "Allied Colloids") have been studied and their coagulating effect in the treatment of wastes from various plants of food industry (meat processing plants, dairies, sugar factories, breweries, fat processing plants, yeast factories and glutin-manufacturing plants) evaluated. In a simple procedure based on the so-called "Jartest", a preliminary assessment of the suitability of individual polyelectrolytes in the treatment was performed. A complete analysis of load factors was carried out only in the cases of the most efficient coagulants for a given type of wastes. It was found that the best results were obtained by the use of polyelectrolytes of a very distinct cationic character (Zetags 48 and 89). It was also revealed that storage of solutions of some polyelectrolytes under study for periods exceeding 6 weeks resulted in a decrease of their coagulating effectiveness. However, none of the investigated coagulants had a satisfactory effectiveness in respect to wastes from yeast factories because of a high content of proteins and dissolved substances in these wastes.
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