Optimization of decolorization of methylene blue by lignin peroxidase enzyme produced from sewage sludge with Phanerocheate chrysosporium

• Published in: Journal of hazardous materials Vol. 162; no. 2; pp. 708 - 715
• Main Authors: Alam, Md. Zahangir, Mansor, Mariatul F., Jalal, K.C.A.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15-03-2009; Elsevier
• Subjects: Applied sciences; Bioreactors; Color; Decolorization; Exact sciences and technology; Fermentation; General purification processes; Lignin peroxidase (LiP); Methylene blue (MB); Methylene Blue - metabolism; Optimization; Other industrial wastes. Sewage sludge; Peroxidases - metabolism; Phanerochaete - enzymology; Phanerochaete chrysosporium; Pollution; Sewage; Sewage treatment plant (STP) sludge; Sewerage works: sewers, sewage treatment plants, outfalls; Wastes; Wastewaters; Water treatment and pollution; Decolorization; Lignin peroxidase (LiP); Sewage treatment plant (STP) sludge; Optimization; Methylene blue (MB); Agitation; Discoloration; Dyes; Hydrogen peroxide; Sewage sludge; Modeling; Sewage treatment plant; pH; Physicochemical purification
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2008.05.085

Optimization of decolorization of methylene blue (MB) dye by lignin peroxidase (LiP) enzyme produced by white-rot fungus
Phanerochaete chrysosporium using sewage treatment plant (STP) sludge as a major substrate was carried out in the laboratory. Optimization by the one-factor-at-a-time (OFAT) and statistical approach was carried out to determine the process conditions on optimum decolorization of MB dye using LiP enzyme in static mode. The OFAT method indicated that the optimum conditions for decolorization of MB dye (removal: 14–40%) was at temperature 55
°C, pH 5.0 with hydrogen peroxide (H
2O
2) concentration 4.0
mM, MB dye concentration 20
mg/L and LiP activity 0.487
U/ml. The addition of veratryl alcohol to the reaction mixtures did not contribute any further increases in decolorization. The initial concentration of MB and the activity of LiP enzyme were further optimized using response surface methodology (RSM). The contour and surface plots suggested that the optimum initial concentration of MB and LiP activity predicted were 15
mg/L and 0.687
U/ml, respectively for the removal of 65%. The validation of the model showed that the decolorization process gave the higher removal of 90% in agitation mode compared to the static mode with 65% for 60
min of incubation time by LiP enzyme.