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Production of Lactic Acid from Waste Potato Industry

par Alsayed Mahmoud, Kassem ;Aoun, Moun.a;Mejri, Emna;Ras El Gherab, Fatma Zohra;Hiligsmann, Serge
Référence 7th International Conference on Engineering for Waste and Biomass Valorisation (2-5 july: Prague - Czech Republic)
Publication Non publié, 2018-07-02

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Résumé :

Potato industry is well known for the vast quantities of organic wastes generated in potato-processing operations. Approximately 8% of potato weight is the typical steam peeling losses, which presents about one million tons of waste each year. Managing the waste of potato peel causes considerable concern to potato industries, which implies the need to identify an integrated approach and an environmental solution. Potato waste could be used in food processing, phyto-pharmaceutical and biosynthesis industries aiming to increase its added value by recycling with several advanced processing technologies such as lactic acid, biogas production, and phenolic acids extraction. Potato industries generate two types of waste: peels and effluents from the peeling and cooking stage, respectively. The aim of this study was to reduce this waste by valorization of potato peels and effluents for the production of lactic acid and cell biomass by Lactococcus lactis. The results of lactic fermentation on potato peels with different hydrolysis treatments showed that 0.26 IU of α-amylase added in three steps was the most efficient treatment to achieve acid production reaching 30 g/L. This three-phase addition was then tested in 2L bioreactors in mixed and pure culture. The results showed that the culture in presence of the endogenous strains led to a maximum production of lactic acid of 46.4 g/L, i.e. a yield of 85%.The fermentation of potato industry effluents particularly rich starch i.e. about 41.7% dry weight were carried out firstly in a 2L batch bioreactor inoculated with Lactococcus lactis, and secondly in a 15L fed batch bioreactor inoculated by a mixed culture. The results showed that the endogenous mixed culture system gives a higher production of lactic acid with a yield of 88.84% compared to those obtained in pure Lactococcus lactis cultures.