Enterobacter GY-1 gained from a lab scale anaerobic-anoxic-aerobic (A2O) process treating textile effluent can effectively decolorize remazol dye. Under anaerobic condition, 91% of this remazol dye is decolorized, whi...Enterobacter GY-1 gained from a lab scale anaerobic-anoxic-aerobic (A2O) process treating textile effluent can effectively decolorize remazol dye. Under anaerobic condition, 91% of this remazol dye is decolorized, which is much higher than under aerobic condition. The optimum pH is 7 and the optimum temperature is 35 ℃ for the remazol dye decolorization by GY-1. Anthraquinone dyes and monoazo dyes are decolorized more efficiently by GY-1 than other dyes tested decolorized. GY-1 can not decolorize the remazol dye when it is the sole carbon source. Microbial cometabolism and decolorization of dye take place in the presence of some other carbon source called cometabolic substrate. The cometabolic substrate can be glucose, starch, peptone, beef extract, etc. The change of molecular structure of the dye before and after decolorized by GY-1 is studied by UV-Vis absorption spectrum. The results indicate that its molecular structure is changed evidently.展开更多
In this study,four biochars prepared from different crop residue waste i.e.sugarcane bagasse(SBB),coconut shell(CNB),paddy straw(PDB),and distilled waste of lemongrass(LGB)were evaluated for removal of Remazol Brillia...In this study,four biochars prepared from different crop residue waste i.e.sugarcane bagasse(SBB),coconut shell(CNB),paddy straw(PDB),and distilled waste of lemongrass(LGB)were evaluated for removal of Remazol Brilliant Blue R from the aqueous system.The RBBR adsorption capacities of biochar were 97-79%for SBB,99.9-99.47%for CNB,66.1-48%for PDB,and 78-68%for LGB,dominantly controlled by their aromaticity and mineral content.The Langmuir and Freundlich isotherms and pseudo-second-order kinetic models have described the chemisorption of RBBR on biochar surfaces.The thermodynamic data suggested that adsorption was spontaneous and endothermic.These biochars demonstrated excellent reusability(till four cycles with 50-61%regeneration).The purified water and biochar dye sludge demonstrated no phytotoxicity.The findings obtained in this study may provide supports for the potential of biochars for anionic dye removal from water and utilization of generated sludge for zero waste-producing technologies in the future.展开更多
基金Fundamental Research Funds for the Central Universities of China(No.2011D11309)Shanghai Leading Academic Discipline,China(No.B604)
文摘Enterobacter GY-1 gained from a lab scale anaerobic-anoxic-aerobic (A2O) process treating textile effluent can effectively decolorize remazol dye. Under anaerobic condition, 91% of this remazol dye is decolorized, which is much higher than under aerobic condition. The optimum pH is 7 and the optimum temperature is 35 ℃ for the remazol dye decolorization by GY-1. Anthraquinone dyes and monoazo dyes are decolorized more efficiently by GY-1 than other dyes tested decolorized. GY-1 can not decolorize the remazol dye when it is the sole carbon source. Microbial cometabolism and decolorization of dye take place in the presence of some other carbon source called cometabolic substrate. The cometabolic substrate can be glucose, starch, peptone, beef extract, etc. The change of molecular structure of the dye before and after decolorized by GY-1 is studied by UV-Vis absorption spectrum. The results indicate that its molecular structure is changed evidently.
基金financial support by the Department of Biotechnology(DBT),New Delhi(BT/PR24706/NER/95/822/2017)under the twinning program.
文摘In this study,four biochars prepared from different crop residue waste i.e.sugarcane bagasse(SBB),coconut shell(CNB),paddy straw(PDB),and distilled waste of lemongrass(LGB)were evaluated for removal of Remazol Brilliant Blue R from the aqueous system.The RBBR adsorption capacities of biochar were 97-79%for SBB,99.9-99.47%for CNB,66.1-48%for PDB,and 78-68%for LGB,dominantly controlled by their aromaticity and mineral content.The Langmuir and Freundlich isotherms and pseudo-second-order kinetic models have described the chemisorption of RBBR on biochar surfaces.The thermodynamic data suggested that adsorption was spontaneous and endothermic.These biochars demonstrated excellent reusability(till four cycles with 50-61%regeneration).The purified water and biochar dye sludge demonstrated no phytotoxicity.The findings obtained in this study may provide supports for the potential of biochars for anionic dye removal from water and utilization of generated sludge for zero waste-producing technologies in the future.
