Potato stillage and sugar beet molasses as a substrate for production of lactic acid and probiotic biomass

Abstract

Distillery stillage is abundant industrial waste with a great potential for utilization as a substrate in production of valuable bio-based products. Processing of distillery stillage on cost effective way can significantly decrease the price of bioethanol as alternative fuel and provide a considerable benefit to the environment. In this paper, combined potato stillage and sugar beet molasses substrate is evaluated for integrated lactic acid and probiotic biomass production by Lactobacillus rhamnosus ATCC 7469. Waste substrate based on potato stillage and sugar beet molasses enabled lactic acid and biomass production with maximal volumetric lactic acid productivity of 1.11 g L-1 h-1 and maximal number of viable L. rhamnosus ATCC 7469 cells of 1.1×109 CFU mL-1. Residue after removal of lactic acid could be recommended as probiotics and betaine-enriched animal feed.

Keywords

• lactic acid
• potato stillage
• molasses
• probiotics
• animal feed