Pretreatment of Rubber Additives Processing Wastewater by Aluminum–Carbon Micro-Electrolysis Process: Process Optimization and Mechanism Analysis

Degradation of organic dye wastewater by H2O2-enhanced aluminum carbon micro-electrolysis

In this research, the treatment of methylene blue (MB) dye wastewater by a novel system that combines H₂O₂ with an aluminum-carbon micro-electrolysis (ACE) was explored. The effects of the H₂O₂ amount, initial pH, aluminum to carbon ratio, total aluminum-carbon mass, dye concentration, and reaction temperature on degradation of MB were investigated. The findings revealed that under the following conditions: H₂O₂ 34.0 mg/L, initial pH of 3.0, aluminum-to-carbon ratio of 2:1, total aluminum-carbon mass of 2.0 g/L, MB concentration of 20 mg/L, and 20 °C, the degradation rate of MB could reach 99.3% after 180 min, which is 18.4% more compared with ACE at the same conditions without H₂O₂. Through the quenching experiments, it was proved that the efficient free radicals produced during degradation are •OH and •O₂^-. Finally, a possible mechanism of H₂O₂ enhanced aluminum carbon micro-electrolysis (HP-ACE) for MB degradation was discussed.