This study investigated the RB-5 decolorization through a Fenton-like process using an recycled magnetite as the catalyst. The recovery of magnetite (Fe3O4) pellets from iron-containing wastewater was performed by fluidized-bed homogeneous crystallization (FBHC) process. In FBHC, operational parameters including pH, cross-section loading (L, kg m-2 h-1), and initial ferrous concentration ((Fe2+)in, mg L-1) were investigated. The crystal of magnetite grew at pH 7.5 – 8.5 in the higher upflow velocity of 9.5 m h-1. Under the optimum condition (L = 1.2 kg m-2 h-1, pH 7.5 – 8.5, (Fe2+)in = 100 – 500 mg/L), the total iron removal and crystallization ratio attained 99% and 77%, respectively. The Fenton-like degradation of RB-5 dye(50 mg/L) was demonstrated by testing parameters of pH = 2 – 11, initial H2O2 concentrations ([H2O2]in ) of 0 – 100 mM, and FBHC pellet of 0 – 20 g/L. The decolorization could achieved up to 99%, optimized at pH = 2 – 2.5, [H2O2]in = 20 mM, and 2 g/L magnetite.

Fenton-like degradation of RB-5 dye using the magnetite recovered from iron-containing wastewater treated by fluidized-bed homogeneous crystallization (FBHC) process

2019 Fall National Meeting

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