Response surface methodology for lead biosorption on Aspergillus terreus

• Published in: International journal of environmental science and technology (Tehran) Vol. 8; no. 4; pp. 695 - 704
• Main Authors: Córdova, F. J. Cerino, León, A. M. García, Reyes, R. B. Garcia, González, M. T. Garza, Regalado, E. Soto, González, M. N. Sánchez, López, I. Quezada
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01-09-2011; Springer Nature B.V
• Subjects: Adsorbents; Adsorption; Aquatic Pollution; Aspergillus terreus; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Science and Engineering; Fungi; Lead; Soil Science & Conservation; Waste Water Technology; Water Management; Water Pollution Control; Water treatment; Biosorbent; Central composite face-centered design; Wastewater; Heavy metals; Optimization
• ISSN: 1735-1472; 1735-2630
• DOI: 10.1007/BF03326254

A central composite face-centered design was used to study and to optimize lead biosorption from aqueous solution on
Aspergillus terreus
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 (2
4
). 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 (R
2
Adj
= 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.