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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 8, No. 4, 2011, pp. 695-704
Bioline Code: st11064
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 8, No. 4, 2011, pp. 695-704

 en Response surface methodology for lead biosorption on Aspergillus terreus check for this species in other resources
Cerino Córdova, F.J.; García León, A.M.; Garcia Reyes, R.B.; Garza González, M.T.; Soto Regalado, E.; Sánchez González, M.N & Quezada López, I.

Abstract

A central composite face-centered design was used to study and to optimize lead biosorption from aqueous solution on Aspergillus terreus check for this species in other resources biomass. Four factors such as stirring speed, temperature, solution pH and biomass dose at different levels were studied.The hierarchical quadratic model were established by adding replicates at the central point and axial points to the initial full factorial design (24). The percentage removal of lead was affected by biomass dose, pH, and interactions between pH and biomass dose, pH and stirring speed, pH and temperature. The hierarchical quadratic model described adequately the response surface based on the adjusted determination coefficient (R2Adj= 0.97) and the adequate precision ratio (42.21). According to this model, the optimal conditions to remove lead completely from aqueous solutions (at initial lead concentration of 50 mg/L and solutions of 100 mL) with Aspergillus terreus were at pH 5.2, 50°C, stirring speed of 102/min and a biomass dose of 139 mg.The response surface methodology can be used to determine the optimal conditions for metal adsorption on several adsorbents. In addition, results reported in this research demonstrated the feasibility of employing A. terreus as biosorbent for lead removal.

Keywords
Biosorbent; Central composite face-centered design; Heavy metals; Optimization; Wastewater

 
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