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)
            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.