title: Decolorization of oxygen-delignified bleaching effluent and biobleaching of oxygen-delignified kraft pulp by non-white-rot fungus Geotrichum candidum Dec 1.
abstract: Decolorization of oxygen-delignified bleaching effluent (abbreviated as OBE) and biobleaching of oxygen-delignified kraft pulp (OKP) were conducted using a non-white rot fungus Geotrichum candidum Dec 1 (abbreviated as Dec 1) which has ability to decolorize various synthetic dyes and molasses. Dec 1 decolorized up to 77% of OBE for 6 days. In addition, Dec 1 increased the brightness of OKP from 47.8% to 51.2% and decreased the kappa value of OKP from 12.4 to 10.4 points during a 6-day incubation period at a 25% of pulp-concentration. At 2% pulp-concentration, the brightness of OKP increased by 13% and the kappa value of OKP decreased by 4 points only for a 3-day incubation period. When the decolorized OBE was used for bleaching of OKP, the brightness of OKP increased to 62.7% under the shaking culture to a 2% pulp-concentration using culture fluid of decolorized OBE. It was revealed that Dec 1 is a potential to apply for decolorization of wastewater and biobleaching of pulp in paper-mills.
authors: Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya-city, Saitama 3690293, Japan.   nshintani@sit.ac.jp
authors: Noboru
authors: N
authors: Shintani
authors: Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 2268503, Japan.
authors: Makoto
authors: M
authors: Shoda
mesh_terms: D057886:Bleaching Agents / Q000737:chemistry*; D003116:Color; D005848:Geotrichum / Q000737:chemistry*; D005947:Glucose / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008031:Lignin / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010209:Paper; D013997:Time Factors; D014865:Waste Disposal, Fluid
chemical_list: D057886:Bleaching Agents; D008031:Lignin; D005947:Glucose; D010100:Oxygen
keywords: biobleaching; decolorization; non-white rot fungus Geotrichum candidum Dec 1; oxygen-delignified bleachning effluent; oxygen-delignified kraft pulp