Kinetic models       Initial naphthalene concentration   10           20           30         40          50              pH   5              7             9 Lagergren              Kad (h-1)              qm (mg/g)              R2   0.032 1.256 0.999   0.032 2.849 0.997   0.032 4.137 0.995   0.032 5.322 0.999   0.032 6.462 0.999   0.038 5.50 0.996   0.032 4.137 0.996   0.041 7.28 0.997 Elovich             α (mg/g/min)            β (g/mg)             R2   0.001 2.336 0.985   0.002 1.086 0.971   0.0030 0.745 0.972   0.004 0.570 0.977   0.005 0.463 0.979   0.0023 0.993 0.972   0.0030 0.745 0.972   0.0026 0.876 0.972 Intraparticle diffusion      Kp (mg/g/min-½)             R2   0.018 0.969   0.041 0.975   0.060 0.977   0.077 0.973   0.094 0.970   0.045 0.977   0.060 0.977   0.051 0.978

Table 6: Kinetic constant parameters for the simultaneous adsorption-biodegradation of naphthalene by P. aeruginosa NCIB 950 immobilized in orange peels for various initial concentration and pH.