A combination process of Fenton-like and catalytic Mn(II) oxidation via molecular oxygen-induced abio-oxidation of As(III)-Mn(II)-rich acid mine drainage (AMD) is developed to rapidly and efficiently remove As and obtain low As-leaching solids in this study. The effect of pH, temperature, oxygen flow rate and neutralization reagent on As removal was investigated. The results showed that pH was important to As removal efficiency, which achieved maximum in 0.25–2 h, but decreased from ∼100 % to ∼92.6 % with the increase of pH 5–9. pH, temperature and oxygen flow rate played key roles in As(III) oxidation. The increase of As(III) oxidized from 16.8 to 67.1% to 98.6–99.0 % occurred as increasing the pH 5–9, 25–95 °C and oxygen flow rate of 0–2.4 L min⁻¹. NaOH or Ca(OH)₂ as base was less important to As removal. The mechanism involved Fenton-like reaction between Fe(II) and O₂ for produced Fe(III) (oxy)hydroxide association with As(III + V) and Mn(II), catalytic Mn(II) oxidation for the formation of Mn(III, IV) oxides, and further As(III) oxidation by Mn(III, IV) oxides. As-bearing six-line ferrihydrite was the main solid product for low As-leaching fixation. pH 8, 95 °C and oxygen flow rate of 1.6 L min⁻¹ were optimal for As removal.

通过富氧的富As（III）-Mn（II）的酸性矿井排水（AMD）的分子氧诱导的生物氧化，进行了Fenton样和催化Mn（II）氧化的组合过程，以快速有效地去除As并获得本研究中的低砷浸出固体。研究了pH，温度，氧气流量和中和试剂对As去除的影响。结果表明，pH对砷的去除效率很重要，在0.25–2 h内达到最大，但随着pH值5–9的增加，砷的去除率从约100％降至约92.6％。pH，温度和氧气流速在As（III）氧化中起关键作用。随着pH 5-9、25-95°C和氧气流速0-2.4 L min ^-1的增加，As（III）的氧化从16.8％增至67.1％增至98.6-99.0％。NaOH或Ca（OH）₂碱对砷的去除次要。机理涉及Fe（II）和O ₂之间的芬顿样反应，以生成与As（III + V）和Mn（II）缔合的Fe（III）（羟基）氢氧化物，催化Mn（II）氧化以形成Mn （III，IV）氧化物，以及进一步被Mn（III，IV）氧化物氧化的As（III）。含砷六线铁水合物是低砷浸出固定的主要固体产物。pH 8、95°C和1.6 L min ^-1的氧气流速最适合去除As。