Fenton's oxidation of food processing wastewater components. Kinetic modeling of protocatechuic acid degradation.
The oxidation of protocatechuic acid (PA), a typical phenol-type compound present in food processing wastewater, has been carried out by means of Fenton's reagent. Both the H2O2 and Fe(II) initial concentrations increase the PA degradation rate. Temperature also enhances the PA conversion when raised from 283 to 313 K, a further increase to 323 K results in a lower PA removal. Increasing the PA initial concentration leads to a decrease of conversion values but an opposite effect in terms of removal rate. pH values in the range 3-4 resulted in the total inhibition of the oxidation process. Similar PA depletion rates were experienced regardless of the oxidation state of the catalyst (ferrous or ferric iron). Additionally, an attempt based on the classic Fenton's chemistry plus some other stages accounting for the Fe(II) regeneration from Fe(III) and the inefficient H2O2 decomposition was conducted to model the process.
Rivas
Francisco J
FJ
Departamento de Ingeniería Química y Energética, Universidad de Extremadura, Avenida de Elvas s/n, 06071 Badajoz. Spain. fjrivas@unex.es
Frades
Jesús
J
Alonso
Miguel A
MA
Montoya
C
C
Monteagudo
J M
JM
D002384:Catalysis; D019649:Food Industry; D006861:Hydrogen Peroxide / Q000737:chemistry; D062385:Hydroxybenzoates / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron; D007700:Kinetics; D010084:Oxidation-Reduction; D013696:Temperature
C045076:Fenton's reagent; D062385:Hydroxybenzoates; D007220:Industrial Waste; C009091:protocatechuic acid; D006861:Hydrogen Peroxide; D007501:Iron