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.