Acid mine drainage (AMD) contains abundant iron, sulfates, and various metal ions, and it causes environmental pollution. The traditional AMD lime neutralization forms a layer of iron hydroxide and gypsum on the surface of the lime particles, preventing continuous reaction and leading to excessive lime addition and neutralized sludge production. In this study, an approach for treating AMD using a cyclic process of biooxidation and electroreduction before lime neutralization was proposed, in which the Fe²⁺ in AMD was oxidized to Fe³⁺ and induced to form schwertmannite through Acidithiobacillus ferrooxidans. The remaining Fe³⁺ was reduced to Fe²⁺ using an electric field. After three biooxidation and two electroreduction cycles, 98.2% of Fe and 62.4% of SO₄²⁻ in AMD precipitated as schwertmannite (Fe₈O₈(OH)_5.16(SO₄)_1.37). The yield of schwertmannite reached 33.98 g/L_AMD, with a high specific surface area of 112.59 m²/g. The lime dosage and sludge yield of the treated AMD in the subsequent neutralization stage (pH = 7.00) decreased by 85.0% and 74.5%, respectively, than those of raw AMD. The pilot test results showed that the integrated treatment of biooxidation–electroreduction cyclic mineralization and lime neutralization has practical applications.

酸性矿山排水（AMD）含有丰富的铁、硫酸盐和多种金属离子，会造成环境污染。传统的AMD石灰中和在石灰颗粒表面形成一层氢氧化铁和石膏，阻碍了连续反应，导致石灰添加量过多，产生中和污泥。在这项研究中，提出了一种在石灰中和之前使用生物氧化和电还原的循环过程来处理 AMD 的方法，其中 AMD 中的 Fe ²⁺被氧化为 Fe ^3+并通过氧化亚铁硫杆菌诱导形成施韦特曼石。剩余的 Fe ³⁺被还原为 Fe ²⁺使用电场。经过三个生物氧化和两个电还原循环后，AMD 中 98.2% 的 Fe 和 62.4% 的 SO ₄ ^2-以施韦特曼石（Fe ₈ O ₈ (OH) _5.16 (SO ₄ ) _1.37）形式沉淀。施韦特曼石的收率达到33.98 g/L _{AMD ，具有112.59 m} ² /g的高比表面积。处理后的 AMD 在随后的中和阶段 (pH = 7.00) 的石灰用量和污泥产量分别比原始 AMD 降低了 85.0% 和 74.5%。中试结果表明，生物氧化-电还原循环矿化与石灰中和一体化处理具有实际应用价值。