利用氢氧化物沉淀、鸟粪石沉淀、氯化混凝多步净化等技术深度去除电解锰渣渗滤液中的锰、铵、磷数据集

工业活动产生的电解锰渣(EMR)释放锰(Mn2+)和氨氮(NH4+ -N)造成的水体污染对生态系统和人类健康构成严重威胁。针对电解锰渣渗滤液中Mn2+和NH4+-N的去除，以及由鸟粪石沉淀引起的正磷酸盐残留问题，优化了一种由氢氧化物沉淀、鸟粪石沉淀、间断氯化和三氯化铁混凝组成的集成工艺。使用X射线衍射、扫描电子显微镜和热重分析对沉淀进行了表征。结果表明，在沉淀pH为10.2时，Mn2+及其产生的化学需氧量( COD )主要通过氢氧化物沉淀去除，其中以难结晶的氢氧化锰沉淀为主。NH4+ -N以易结晶的鸟粪石沉淀为主要产物进行初步去除和回收，然后采用折点加氯法进一步去除。鸟粪石沉淀引入的残余正磷酸盐通过铁盐混凝剂被成功去除，出水pH ( 7.5 )也通过铁盐混凝剂的水解被降低到排放限值。最终出水COD、Mn2+、NH4+ -N和正磷酸盐浓度分别为30.52±9.38、0.026±0.013、0.87±0.01和0.06±0.002 mg / L，均满足地方排放标准。这种组合工艺具有稳定的污染物去除效率、较高的资源回收潜力和较少的环境约束。因此，它被推荐为处理富含Mn2+和NH4+ -N的酸性矿山废水污染的解决方案。

Electrolytic Manganese Residue (EMR) generated from industrial activities releases manganese (Mn²+) and ammonia nitrogen (NH₄⁺-N), causing water pollution that poses severe threats to both ecosystems and human health. To address the removal of Mn²+ and NH₄⁺-N from EMR leachate, as well as the residual orthophosphate problem induced by struvite precipitation, an integrated process combining hydroxide precipitation, struvite precipitation, intermittent chlorination, and ferric chloride coagulation was optimized. The precipitates were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The results demonstrated that at a precipitation pH of 10.2, Mn²+ and the accompanying Chemical Oxygen Demand (COD) were primarily removed via hydroxide precipitation, with poorly crystalline manganese hydroxide as the dominant precipitate. NH₄⁺-N was initially removed and recovered using easily crystalline struvite as the main product, followed by further elimination via the breakpoint chlorination method. Residual orthophosphate introduced during struvite precipitation was successfully removed by ferric coagulants, and the effluent pH (7.5) was also reduced to meet discharge limits through the hydrolysis of ferric coagulants. The final effluent concentrations of COD, Mn²+, NH₄⁺-N, and orthophosphate were 30.52±9.38, 0.026±0.013, 0.87±0.01, and 0.06±0.002 mg/L, respectively, all complying with local discharge standards. This combined process exhibits stable pollutant removal efficiency, high resource recovery potential, and minimal environmental constraints. Thus, it is recommended as a feasible solution for treating acid mine wastewater contaminated with high levels of Mn²+ and NH₄⁺-N.