Search

Highlights: [•] DO limitation was commonly encountered in high cell density cultivation of DHA. [•] The cultures with more than 100g/L cell density exhibited shear-thinning behavior. [•] Apparent viscosity of the broth significantly affected the change of kLa. [•] OUR was proposed to be an on-line parameter for scale-up of DHA production. [ABSTRACT FROM AUTHOR]

Abstract: An investigation was conducted to explore the lignin-degrading capacity of attached-growth white-rot fungi. Five white-rot fungi, Phanerochaete chrysosporium, Pleurotus ostreatus, Lentinus edodes, Trametes versicolor and S22, grown on a porous plastic media, were individually used to treat black liquor from a pulp and paper mill. Over 71% of lignin and 48% of chemical oxygen demand (COD) were removed from the wastewater. Several factors, including pH, concentrations of carbon, nitrogen and trace elements in wastewater, all had significant effects on the degradation of lignin and the removal of COD. Three white-rot fungi, P. chrysosporium, P. ostreatus and S22, showed high capacity for lignin degradation at pH 9.0–11.0. The addition of 1gl−1 glucose and 0.2gl−1 ammonium tartrate was beneficial for the degradation of lignin by the white-rot fungi studied. [Copyright &y& Elsevier]