Microbiological treatment of oil mill waste waters
Title:
Microbiological treatment of oil mill waste waters
Author:
Ranalli, A.
Appeared in:
Grasas y aceites
Paging:
Volume 43 (1992) nr. 1 pages 16-19
Year:
1992
Contents:
Experiments of the biological treatment of the oil mill waste waters, deriving from continuous system, have been carried out with selected mutant ferments, adapted to rather forced toxic conditions.
The commercial microbio formulations SNKD, LLMO and PSBIO have been utilized; the last two are liquid suspensions, constituted by living micro-organisms that, in contrast to those frozen or lyophilized, do not need be revitalized before their use and became completely active in short time.
The experiments with the SNKD biological preparation were carried out both on filtered oil mill outflows (type A) with an initial COD of approximately 43 g/l and on waste water dephenolized by Caro-acid (type B) with a COD equal to 30 g/l. The experiments with LLMO and PSBIO complexes were conduced both on oil mill outflows filtered and diluted (ratio 1:0.5) with an initial COD equal to 44 g/l (type C), and on waste water that were filtered and preventatively subjected to a cryogenic treatment (type D), with an initial COD of approximately 22 g/l.
The residual COD with the microbio formulation SNKD, was about 15 g/l (type A) and 5 g/l (type B); with the PSBIO It was about 7 g/l (type C) and 1.5 g/l (type D); with the microbio formulation LLMO it resulted in 6 g/l (type C) and 1.3 g/l (type D).<br><br>Han sido efectuadas pruebas de tratamiento biológico de alpechines, provenientes de sistemas continuos, con fermentos seleccionados adaptados a condiciones de toxicidad muy elevadas.
Han sido utilizadas las formulaciones microbianas SNKD, LLMO y PSBIO; las dos últimas son suspensiones líquidas, constituidas por microorganismos vivos, los cuales a diferencia de los liofilizados o congelados, no deben ser revitalizados antes del uso; estos tienen una fase «lag» más breve y entran antes en completa actividad.
Las pruebas con la preparación biológica SNKD han sido efectuadas en los alpechines filtrados (tipo A) con DQO inicial alrededor de 43 g/l, y también con alpechín filtrado «defenolado» con ácido de Caro (H2SO5 (tipo B), con DCX) igual a 30 g/l; los complexos LLMO y PSBIO se utilizan en alpechines provenientes de la elaboración de otras variedades de aceitunas, filtradas y diluidas en la relación 1:0,5 (tipo C) con DQO inicial igual a 44 g/l, y también en alpechín filtrado y sometido previamente a criotratamiento (tipo D), con DQO inicial de 22 g/l aproximadamente.
La DQO residual, con la formulación microbiana SNKD, ha resultado igual a 15 g/l (Tipo A) y a 5 g/l (tipo B), con el PSBIO a 7 g/l (tipo C) y a 1,5 g/l (tipo D); con la formulación microbiana LLMO a 6 g/l (tipo C) y a 1,3 g/l (tipo D).
Publisher:
Consejo Superior de Investigaciones Científicas - Consejo Superior de Investigaciones Científicas (provided by DOAJ)
Journal description