title: Removal of pigments from molasses wastewater by combining micro-electrolysis with biological treatment method.
abstract: Pigments in molasses wastewater (MWW) effluent, such as melanoidins, were considered as kinds of the most recalcitrant and hazardous colorant contaminants to the environment. In this study, de-coloring the MWW by a synergistic combination of micro-electrolysis with bio-treatment was performed. Aiming to a high de-colorization yield, levels of nutrition source supplies, MWW dilution ratio, and micro-electrolysis reaction time were optimized accordingly. For a diluted (50 %, v/v) MWW, an maximum overall de-colorization yield (97.1 ± 0.5 %, for absorbance at 475 nm) was achieved through the bio-electrolysis treatment. In electrolysis bio-treatment, the positive effect of micro-electrolysis was also revealed by a promoted growth of fungal biomass as well as activities of ligninolytic enzymes. Activities of lignin peroxidase, manganese peroxidase, and laccase were promoted by 111.2, 103.9, and 7.7 %, respectively. This study also implied that the bio-treatment and the micro-electrolysis had different efficiencies on removal of pigments with distinct polarities.
authors: School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, China.
authors: Ben
authors: B
authors: Chen
authors: School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, China.
authors: Xiaofei
authors: X
authors: Tian
authors: School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
authors: Lian
authors: L
authors: Yu
authors: School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, China. btzhqwu@scut.edu.cn.
authors: Zhenqiang
authors: Z
authors: Wu
mesh_terms: D001234:Aspergillus niger / Q000254:growth & development*; D004572:Electrolysis; D005656:Fungal Proteins / Q000737:chemistry / Q000378:metabolism; D042845:Laccase / Q000737:chemistry / Q000378:metabolism; D008965:Molasses / Q000382:microbiology*; D010544:Peroxidases / Q000737:chemistry / Q000378:metabolism; D010860:Pigments, Biological / Q000737:chemistry / Q000378:metabolism; D062065:Wastewater / Q000737:chemistry / Q000382:microbiology; D018508:Water Purification / Q000379:methods*
chemical_list: D005656:Fungal Proteins; D042845:Laccase; D010544:Peroxidases; D010860:Pigments, Biological; D062065:Wastewater; C042858:lignin peroxidase; C051129:manganese peroxidase
keywords: Aspergillus niger; De-colorization yield; Ligninolytic enzymes; Molasses wastewater; Strong polarity pigments