Production of Citric Acid from Brewery Wastes by Surface Fermentation UsingAspergillus niger

摘要

ABSTRACTThe possible use of spent grain liquor and lager tank sediment as fermentation media for the production of citric acid by variousAspergillus nigerstrains has been investigated. A strain ofA. nigerATCC 9142, on spent grain liquor, gave a citric acid concentration of 19 g/L, representing a yield of 78.5 (w/w) based on total reducing sugars consumed. On lager tank sediment 11.5 g/L citric acid were produced. The yield of citric acid, based on the total reducing sugars consumed, was 57.5 (w/w).