N. I. Ihimekpen; E. Atikpo; N. Kayode-Ojo; A. Michael
Abstract
The abilities of three indigenous bacteria for bioremediation of cadmium contaminated soils collected from Agbabu Farm Settlement close to mining sites in Ondo state, Nigeria was studied to provide helpful information for soils remediation and soils health management in this sub-region for Millennium ...
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The abilities of three indigenous bacteria for bioremediation of cadmium contaminated soils collected from Agbabu Farm Settlement close to mining sites in Ondo state, Nigeria was studied to provide helpful information for soils remediation and soils health management in this sub-region for Millennium Development Goals accomplishment. Bacillus subtilis, Proteus mirabilis, and Escherichia coli isolated from the soils were inoculated into different soil samples conditioned with optimized factors determined from the first phase experiments. The conditioned samples were experimented for residual cadmium concentration with time in days using Atomic Absorption Spectrophotometer. The soil cadmium attenuation from the initial concentration of 70.21 mg/kg to below the maximum allowable of 3 mg/kg was hard for the organisms. Bacillus subtilis performed correction at time 35 days with an efficiency of 96.10 % and residual concentration of 2.74 mg/kg. Proteus mirabilis and Escherichia coli with respective, high efficiencies of 85.05% and 79.35% failed. The removal rate capacities were -0.131d-1 for B. subtilis; -0.111d-1 for P. mirabilis; -0.105d-1 for E. coli. Four kinetic models fitted described the experimental data well. The models assessment revealed the removals to be transport controlled as diffusion process was the rate-controlling step.
M. El-khomri; N. El-messaoudi; S. Bentahar; A. Dbik; A. Lacherai
Abstract
In this work, Crystal Violet (CV), cationic dye, is removed from aqueous solution, using wood of Argan shell(ARS) and Almond shell (ALS), as low-cost and eco-friendly biosorbants. The parameters influencing the adsorption of CVon each of our adsorbents, contact time (5–180 min), adsorbent dose ...
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In this work, Crystal Violet (CV), cationic dye, is removed from aqueous solution, using wood of Argan shell(ARS) and Almond shell (ALS), as low-cost and eco-friendly biosorbants. The parameters influencing the adsorption of CVon each of our adsorbents, contact time (5–180 min), adsorbent dose (0.2–2 g), pH of the solution (3–11), temperature (20–50°C) and the initial dye concentration (50–500 mg.L-1), were studied.The modeling of experimental results obtained, shows that the CV adsorption on both biomaterials follows a pseudo-second-order kinetic and in perfect agreement with Langmuir isotherm. Also CV is better adsorbed on ALS that ARS, with maximum biosorption amounts 51.99 mg.g-1 and 37.32mg.g-1, respectively, at 40 ° C. Thermodynamic calculations have shown that the sorption is spontaneous, endothermic and random at the solid / solution interface. Adsorption capacities of dyes by ARS and ALS are better or comparable to those of several other biomaterials already studied.ALS and ARS biomaterials studied can be considered as alternative biosorbants low-cost and eco-friendly..
H. Saeed; F. S. Chaudhry; S. Rehman; Z. Rashid; A. Ijaz; J. A. Awan
Abstract
The biosorption of toxic metal ions from tannery wastewater effluents was studied with the aid of adsorbent prepared by physicochemical treatment of pomegranate’s membrane (inner whitish material). The results showed that the physicochemical treated Punica granatum (pomegranate) membranes/ ...
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The biosorption of toxic metal ions from tannery wastewater effluents was studied with the aid of adsorbent prepared by physicochemical treatment of pomegranate’s membrane (inner whitish material). The results showed that the physicochemical treated Punica granatum (pomegranate) membranes/ peels absorb higher concentration of metallic ions from tannery wastewater as compared to heat treated Punica granatum membranes/peels. The contact time of wastewater effluent with pomegranate membrane has also been studied. The biosorption of metallic ions are observed to be more effective by increasing contact time of physicochemical modified adsorbent i.e. heterogeneous mixture of H3PO4.ZnCl2 modified pomegranate membranes/peels. It has also been observed that maximum adsorption of toxic metallic ions from tannery wastewater can be obtained by using P. granatum membranes/peels treated with heterogeneous mixture of H3PO4.ZnCl2 at a temperature of 873K. A comparison of heat treated P. granatum membranes and acid treatment treated P. granatum membranes (with conc. HNO3) is conducted. The maximum adsorption was observed by a heterogeneous mixture of H3PO4.ZnCl2 treated pomegranate membranes/peels. It was also observed that heterogeneous mixture of H3PO4.ZnCl2 treated P. granatum membranes/peels, activated at 873K provide best absorption of toxic metallic ions from tannery waste water.