Effect of different carriers and operating parameters on degradation of flax wastewater by fluidized-bed Fenton process

This investigation evaluates the effectiveness of a fluidized-bed Fenton process in treating flax wastewater. Flax wastewater was taken from a paper-making factory in a secondary sedimentation tank effluent of a paper-making factory in Hebei. The performance of three carriers (SiO₂, Al₂O₃, Fe₂O₃) used in the reactor was compared, and the effects of different operational conditions, and Fenton reagent concentrations were studied. Experimental results indicated that SiO₂ was the most appropriate carrier in the system. The dose of Fe²⁺ and H₂O₂ was a significant operating factor in the degradation progress. The bed expansion was considered to be another factor influencing the treatment effect. Under the appropriate conditions (300 mg/L Fe²⁺, 600 mg/L H₂O₂, and 74.07 g/L SiO₂ as the carrier, at pH = 3, 50% bed expansion), the highest removal rate of total organic carbon (TOC) and color was 89% and 94%, respectively. The article also discussed the process of the colority removal of flax wastewater and the kinetics of TOC removal.