Environmental assessment of residues generated after consecutive acid-base pretreatment of sugarcane bagasse by advanced oxidative process

Sustainable Chemical Processes

Table 8 Process variables and their ranges selected for the AOP with photo-Fenton process applied to lignin solution using L ₉ Taguchi matrix

Factors	Level 1	Level 2	Level 3
Temperature (°C)	25	30	35
pH	2.5	3.0	3.5
Fenton Reagent * (m_H2O2 g + m_Fe+2L^-1)	96 mL H₂O₂ +	120 mL H₂O₂ +	144 mL H₂O₂ +
Fenton Reagent * (m_H2O2 g + m_Fe+2L^-1)	87 mL sol Fe²⁺	120 mL Fe²⁺	153 mL Fe²⁺
Ultra-violet irradiation	None	16 W	28 W

*Both H₂O₂ and Iron II were used in solutions with concentrations of [H₂O₂], 30% m/m and [Fe²⁺], 0.82 mol/L. These values are the proportional to the treated effluent volume of 3 L.