title: Kraft Lignin Biodegradation byDysgonomonassp. WJDL-Y1, a New Anaerobic Bacterial Strain Isolated from Sludge of a Pulp and Paper Mill.
abstract: Wastewater containing kraft lignin (KL) discharged from pulp and paper industries could cause serious environmental contamination. Appropriate effluent treatment is required to reduce the pollution. Investigations on anaerobic bacteria capable of degrading KL are beneficial to both lignin removal and biofuel regeneration from the effluent. In this paper, an anaerobic strain capable of degrading KL was isolated from the sludge of a pulp and paper mill and identified asDysgonomonassp. WJDL-Y1 by 16S rRNA analysis. Optimum conditions for KL degradation by strain WJDL-Y1 were obtained at initial pH of 6.8, C:N ratio of 6 and temperature of 33°C, based on statistical analyses by response surface methodology. For a 1.2 g/l KL solution, a COD removal rate of 20.7% concomitant with biomass increase of 17.6% was achieved after 4 days of incubation under the optimum conditions. After the treatment by strain WJDL-Y1, KL was modified and degraded.
authors.affiliation: Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China.|State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, P.R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Duan
authors.affiliation: Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China.|State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, P.R. China.
authors.forename: Jidong
authors.initials: J
authors.lastname: Liang
authors.affiliation: Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
authors.forename: Yiping
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Du
authors.affiliation: State Key Laboratory of Eco-Hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an 710048, P.R. China.
authors.forename: Dongqi
authors.initials: D
authors.lastname: Wang
mesh_terms: D001421:Bacteria, Anaerobic / Q000302:isolation & purification / Q000378:metabolism*; D041963:Bacteroidetes / Q000302:isolation & purification / Q000378:metabolism*; D001673:Biodegradation, Environmental; D007220:Industrial Waste; D008031:Lignin / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D010209:Paper; D012722:Sewage / Q000382:microbiology*
chemical_list: D007220:Industrial Waste; D012722:Sewage; C076151:Kraft lignin; D008031:Lignin
keywords: Dysgonomonas sp.; Kraft lignin; anaerobic biodegradation; bacteria isolation; optimization