Protein recovery during the overall treatment of wastewater from fish-meal factories
1998
Guerrero, L. | Omil, F. | Mendez, R. | Lema, J.M.
The suspended solids contained in the wastewaters generated by fish-meal industries (5-40 g VSS/l) are composed mostly of protein which could be recovered to optimise the manufacturing process. In this work settling centrifugation and coagulation-flocculation were studied as alternative treatment processes to attain this objective. Settling experiments showed that the flotation of a high fraction of suspended solids occurred (up to 45%) even with previous alkalinisation or the addition of a coagulant such as chitosan. Centrifugation at 10000 rpm for 12.5 min gave optimum results, TSS and soluble COD removal deficiencies of 45-82% and 10% respectively being obtained. The amino acid profile of the solids was quite similar to fish meal indicating the feasibility of solids reuse. Results obtained after coagulation-flocculation followed by centrifugation showed that among the different compounds assayed sodium polyacrylate and chitosan produced the best results, operating at pH 4 and 7.2-7.8 respectively and giving TSS removal efficiencies up to 97 and 75% respectively.
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