Journal Title
Title of Journal: Waste Biomass Valor
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Abbravation: Waste and Biomass Valorization
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Publisher
Springer Netherlands
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Authors: Roxana García Yaima Izquierdo Mauricio Ribas Keyla Tortoló Mylai Ibáñez Olga León Maribel Saura Gustavo Saura
Publish Date: 2013/02/28
Volume: 5, Issue: 1, Pages: 119-124
Abstract
In the industrial process of propagation of fodder yeast from distillery waste a proper balance of nitrogen salts available commercially is crucial This paper describes a study to determine the effect of replacing ammonium sulphate with urea in the propagation of Candida utilis from the distilled residual derived from alcoholic fermentation of filter mud juice A reformulation in the growth medium may offer an alternative nitrogen source without affecting quality parameters of the final productCandida utilis L/3757 responded favorably at a laboratory scale in the presence of urea with average values of 980 g l−1 8003 and 5376 of net biomass substrate conversion efficiency and percent removal of chemical oxygen demand respectively There was a significant impact on the increase of pH by using urea with final values in the neutral zone None of the quality parameters evaluated for yeast net protein 4387 and 219 phosphorous were affected with regard to the use of ammonium sulphateFrom the equations obtained for models that define the behavior of the percentage of removal of chemical oxygen demand conversion efficiency and final pH adjustment these parameters could be predicted by replacing the nitrogen added via ammonium with urea according to availability Special attention should be paid to pH levels when urea additions are increased in the formulation of the culture medium in order to maintain optimum pH for the propagation of the yeast and in order to counteract bacterial contaminationThe authors wish to acknowledge personnel from Laboratory of Sugar Industry Waters and Wastewaters LAGUAZUR Havana and Biochemistry Department ICIDCA’s Biotechnology Division for the help on substrate characterization Professor Miguel A Otero is gratefully acknowledged for technical assistance
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