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The performance of two laboratory scale biofilters, packed with pressmud (BF1) and sugarcane bagasse (BF2), was evaluated for gas phase ethylacetate removal under various operating conditions. Biofilters were inoculated with mixed culture obtained from pharmaceutical wastewater sludge. Experiments were carried out at different flow rates (0.03, 0.06, 0.09 and 0.12 m3 h−1) and inlet ethylacetate concentrations (0.2, 0.4, 0.6 and 1.2 gm−3). Maximum removal efficiency (RE) of 100% and 98% was achieved at an inlet concentration of 0.2 gm−3 and gas flow rate of 0.03m3 h−1 in BF1 and BF2, respectively. A maximum elimination capacity (EC) of 66.6 gm−3 h−1 and 64.1 gm−3 h−1 was obtained in BF1 and BF2, respectively, at an inlet concentration of 0.8 gm−3 and a gas flow rate of 0.12 m3 h−1. The kinetics of biofiltration of ethylacetate was studied by using Ottengraf and van den Oever model. The kinetic modelling gives an insight into the mechanism of biofiltration. The modified Ottengraf model, which was also tested, demonstrated good agreement between calculated and experimental data.
Textile dye effluent treatment was investigated using a novel biosorbent synthesized from Prosopis cineraria. The influence of operating variables, namely initial COD of the effluent (352-1,303 ㎎/L) and adsorbent dosage (0.25-4.0 g/L) on the removal efficiency was studied. The results of the biosorption experiments indicated that the equilibrium COD removal efficiency attained was 68% and COD uptake achieved was 90.52 ㎎/g at an optimal sorbent dose (2.0 g/L). Pseudo second order model fitted well to the experimental data and the rate constant was estimated as 0.098 x 10<SUP>-5</SUP> g /(㎎ min) .Chemisorption was identified as the removal mechanism involved. Power function model represented the kinetic data in selected range of COD and kinetic constants were estimated. XRF analysis of the biosorbent confirmed the presence of potassium oxide and calcium oxide as the two major components.
The present investigation deals with the sorption of Cr(VI) onto a marine brown algae Sargassum myriocystum in batch reactors. Response surface methodology (RSM) was used for the optimization of variables like pH, sorbent dosage (g/L), agitation speed (rpm) and contact time (min). A maximum percentage removal of Cr(VI) by Sargassum myriocystum occurs at the following conditions: pH - 5.2; sorbent dosage - 2.017 g/L; agitation speed - 120 rpm and contact time - 108min. Before and after sorption, Sargassum myriocystum was characterized. Kinetic studies were performed using various kinetic models. It was found that the sorption process of Cr(VI) ions follows pseudo-second order, Elovich and power function kinetics. The data obtained were fitted to different isotherms. Sorption of Cr(VI) onto Sargassum myriocystum follows Langmuir and Toth isotherm models (R2=0.993 and 0.992), with a maximum sorption capacity of 66.66mg/g. The calculated thermodynamic parameters such as ΔGo, ΔHo and ΔSo showed that the sorption of Cr(VI) ions onto Sargassum myriocystum biomass was feasible, spontaneous and endothermic. Desorption experiments show that the Sargassum myriocystum sorbent can be regenerated using 0.2M HCl solutions with up to 80% recovery.