In this study,the biosorption of Malachite green(MG)onto Turbinaria conoides,brown marine algae,was studied with respect to initial pH,temperature,initial dye concentration,and sorbent dosage.The optimum initial pH an...In this study,the biosorption of Malachite green(MG)onto Turbinaria conoides,brown marine algae,was studied with respect to initial pH,temperature,initial dye concentration,and sorbent dosage.The optimum initial pH and temperature values for MG removal were found to be 8.0 and 30℃,respectively.Sorbent dosage was found to strongly influence the removal of MG.Equilibrium studies were carried out to test the validity of the Langmuir(q_(max)=66.6 mg/g and b=0.526 mL mol/L)and the Freundlich(n=1.826 and K=3.751 mg/g)isotherms.The kinetic studies indicated the validity of the pseudo first-order and second-order equation.展开更多
Aerobic digestion of starch industry waste-water was carried out in an inverse fluidized bed bioreactor using low-density(870kg/m 3)polypropylene particles.Experiments were carried out at different initial substrate c...Aerobic digestion of starch industry waste-water was carried out in an inverse fluidized bed bioreactor using low-density(870kg/m 3)polypropylene particles.Experiments were carried out at different initial substrate concentrations of 2250,4475,6730,and 8910mg COD/L and for various hydraulic retention times(HRT)of 40,32,24,16,and 8h.Degradation of organic matter was studied at different organic loading rates(OLR)by varying the HRT and the initial substrate concentration.From the results it was observed that the maximum COD removal of 95.6% occurred at an OLR of 1.35kg COD/(m^(3)·d)and the minimum of 51.8% at an OLR of 26.73kg COD/(m 3$d).The properties of biomass accumulation on the surface of particles were also studied.It was observed that constant biomass loading was achieved over the entire period of operation.展开更多
In the present study,the effect of adsorbent dose,pH,temperature,initial dye concentration and contact time on malachite green removal from an aqueous medium using hydrilla verticillata biomass has been investigated.T...In the present study,the effect of adsorbent dose,pH,temperature,initial dye concentration and contact time on malachite green removal from an aqueous medium using hydrilla verticillata biomass has been investigated.The central composite face-centered experimental design(CFCD)in respons surface methodol-ogy(RSM)was used for designing the experiments as well as for full response surface estimation.The optimum conditions for maximum removal of malachite green from an aqueous solution of 75.52mg/L were as follows:adsorbent dose(11.14g/L),pH(8.4),temperature(48.4℃)and contact time(194.5min).This was evidenced by the higher value of coefficient of determination(R^(2)=0.9158).展开更多
A Plackett-Burman design was employed for screening 18 nutrient components for the production of inulinase using streptomyces sp.and pressmud as the substrate via solid-state fermentation(SSF).From the experiments,thr...A Plackett-Burman design was employed for screening 18 nutrient components for the production of inulinase using streptomyces sp.and pressmud as the substrate via solid-state fermentation(SSF).From the experiments,three nutrients viz.yeast extract,FeSO_(4)·7H_(2)O,and NH4NO3 were found to be the most significant components.Hence these three components were selected and optimized using Response Surface Methodology(RSM).The optimum conditions are:yeast extract 0.00274 g/gds,FeSO_(4)·7H_(2)O 0.00011 g/gds and NH4NO30.00772 g/gds.The effect of the substrate concentration and initial moisture content were also studied.A substrate concentration of 12 g and an initial moisture content of 65%are optimum for the maximum production of inulinase(89 U/gds).展开更多
文摘In this study,the biosorption of Malachite green(MG)onto Turbinaria conoides,brown marine algae,was studied with respect to initial pH,temperature,initial dye concentration,and sorbent dosage.The optimum initial pH and temperature values for MG removal were found to be 8.0 and 30℃,respectively.Sorbent dosage was found to strongly influence the removal of MG.Equilibrium studies were carried out to test the validity of the Langmuir(q_(max)=66.6 mg/g and b=0.526 mL mol/L)and the Freundlich(n=1.826 and K=3.751 mg/g)isotherms.The kinetic studies indicated the validity of the pseudo first-order and second-order equation.
文摘Aerobic digestion of starch industry waste-water was carried out in an inverse fluidized bed bioreactor using low-density(870kg/m 3)polypropylene particles.Experiments were carried out at different initial substrate concentrations of 2250,4475,6730,and 8910mg COD/L and for various hydraulic retention times(HRT)of 40,32,24,16,and 8h.Degradation of organic matter was studied at different organic loading rates(OLR)by varying the HRT and the initial substrate concentration.From the results it was observed that the maximum COD removal of 95.6% occurred at an OLR of 1.35kg COD/(m^(3)·d)and the minimum of 51.8% at an OLR of 26.73kg COD/(m 3$d).The properties of biomass accumulation on the surface of particles were also studied.It was observed that constant biomass loading was achieved over the entire period of operation.
文摘In the present study,the effect of adsorbent dose,pH,temperature,initial dye concentration and contact time on malachite green removal from an aqueous medium using hydrilla verticillata biomass has been investigated.The central composite face-centered experimental design(CFCD)in respons surface methodol-ogy(RSM)was used for designing the experiments as well as for full response surface estimation.The optimum conditions for maximum removal of malachite green from an aqueous solution of 75.52mg/L were as follows:adsorbent dose(11.14g/L),pH(8.4),temperature(48.4℃)and contact time(194.5min).This was evidenced by the higher value of coefficient of determination(R^(2)=0.9158).
文摘A Plackett-Burman design was employed for screening 18 nutrient components for the production of inulinase using streptomyces sp.and pressmud as the substrate via solid-state fermentation(SSF).From the experiments,three nutrients viz.yeast extract,FeSO_(4)·7H_(2)O,and NH4NO3 were found to be the most significant components.Hence these three components were selected and optimized using Response Surface Methodology(RSM).The optimum conditions are:yeast extract 0.00274 g/gds,FeSO_(4)·7H_(2)O 0.00011 g/gds and NH4NO30.00772 g/gds.The effect of the substrate concentration and initial moisture content were also studied.A substrate concentration of 12 g and an initial moisture content of 65%are optimum for the maximum production of inulinase(89 U/gds).
