摘要：Response surface methodology （RSM） employing 5-level Box-Behnken design was used to optimize the biosorption of cerium（III） onto biowaste materials of animal and plant origin viz. prawn carapace （PC） and corn style （CS）. Various process parameters viz. pH （A：3.0-9.0）, biomass dosage （B：0.05-0.35 g/L）, initial metal concentration （C：50-350 mg/L）, contact time （D：2-6 h） and temperature （E：20-60 ℃ were chosen for optimization. A log transformation was suggested by the Box-Cox plot in the present case. A low p-value of〈0.0001 validated the significance of the model. Maximum Ce（III） uptake of 218.3 mg/g for PC and 180.2 mg/g for CS was noted under optimum conditions. Among the equilibrium isotherms, Freundlich model was found to be the best fitted one suggesting a heterogeneous mode of biosorption on PC whereas Langmuir model showed the best fit suggesting homogeneous mode of cerium biosorption on CS. This was further confirmed by scanning electron microscopy （SEM）. Kinetic studies showed better applicability of pseudo-first order model suggesting physisorption as phenomena underlying the process. Film-diffusion was suggested by the non-linearity of the Boyd plot. Thermodynamic studies showed that the process was endothermic and spontaneous. FTIR analysis confirmed a major involvement of the participation of amide, amines, ketones and primary alcohol groups during Ce（III） biosorption. EDAX analysis confirmed the major participation of carbon group during Ce（III） biosorption. This was the first report on parameter optimization of Ce（III） biosorption onto biowaste materials using 5-level Box-Behnken experimental design which might be helpful for the recovery of Ce（III） from aqueous environment.

摘要：Background Benzo[ghi]perylene (BghiP), a polycyclic aromatic hydrocarbon (PAH) containing six fused benzene rings is considered as priority pollutant because of its carcinogenicity, mutagenicity and acute *** The synthesis of ZnO nanoparticles was done following the standard method. Biosurfactant production by yeast consortium YC04 in MSM was confirmed by various tests viz. drop collapse test, methylene blue agar plate method and emulsification test (E24) using the standard procedures. Efficiency of YC04 was tested to remediate BghiP in presence of ZnO nanoparticles and produced biosurfactant in the growth *** Response surface methodology (RSM), 3-level five variables Box-Behnken design (BBD) was employed to optimize the factors viz. pH 7.0, temperature 30°C, shaking speed 130 rpm, inoculum dosage 3% and ZnO nanoparticles concentration 2 g/L after a period of 6 days of incubation for the enhanced degradation of BghiP (63.83±0.01%). It was well in close agreement with the predicated value obtained by RSM model yield (63.83±0.08%). Analysis of variance (ANOVA) showed F-value of 51.70, R2 of 0.9764, probability of<0.0001 and coefficient of variation of 1.25% confirmed the validity of the model. Degradation of BghiP was assessed using GC-MS and FTIR analysis. Kinetic study demonstrated that BghiP degradation fitted first order kinetic *** To the best of our knowledge, this is the first report on process optimization toward nanobioremediation of BghiP using yeast consortium in presence of ZnO nanoparticles and produced biosurfactant in medium.

摘要：One of the most important issues regarding the design of engineered landfill is landfill leachate that is produced when water passes through the waste. Landfill Leachate comprises a mass of different organic and inorganic components which can be dissolved or suspended. Regardless of the nature of the components, it poses a potential pollution on local land and surface waters. The present work was undertaken to assess, isolate, identify and characterize the hydrocarbon degrading bacteria associated with environmental samples collected from discharge of Ain Temouchent, Algeria. The samples （landfill leachate） were chemically and microbiologically analyzed using standard techniques. These organisms were further studied to determine the level of biodegrading activities on hydrocarbons as the single carbon source using enrichment medium under different physical and chemical parameters （pH, temperature, NaCI and tolerance of crude oil...）, The identification of seven strains isolated named as Pseudomonas aeruginosa, Pseudomonas fluorescens, Pseudornonas sp., Staphylococcus aureus, Staphylococcus xylosus, Staphylococcus hominis and Staphylococcus warnerii. These strains growth on a neutral medium and temperature between 30 ℃ and 37 ℃, 5 at 6% of NaCI concentration, and can use a concentration of 5 at 10% of crude oil as sole source of carbon.