【摘要】 利用赤泥所含有的Fe、Al等具有净水作用的元素,制备出Fe₂O₃含量>5.1%、Al₂O₃含量>6.5%、碱度>65%的赤泥基PAFC,考察了赤泥基PAFC对印染污水zeta电位的影响。对赤泥基聚合氯化铝铁（PAFC）、聚合氯化铝（PAC）、聚合氯化铁（PFC）和聚合硫酸铁（PFS）在印染污水处理中进行混凝对比的研究表明,赤泥基PAFC在色度和COD去除率方面明显优于同类产品。进一步对比研究PAFC和PFS协同混凝的效果,优化出赤泥基PAFC正向协同混凝PFS,按照2.5:1的投料比,可进一步降低印染污水COD去除率,达到国家1级A的标准,很好地解决了印染污水外排不达标的难题。更多还原

【Abstract】 Considering that Fe, Al elements in bauxite residue are active components for water purification, an effective polyaluminum ferric chloride（PAFC） coagulant derived from bauxite residue, with Fe₂O₃ content > 5.1%, Al₂O₃ % >6.5%, basicity > 65%, was successfully prepared. The effect of as-prepared PAFC on the zeta potential for printing and dyeing wastewater was investigated. Comparing with polyferric chloride（PFC） and polyferric sulfate（PFS） for printing and dyeing wastewater treatment, prepared bauxite residue-based PAFC exhibited the optimal performance in the aspects of chromaticity and chemical oxygen demand（COD） removal rate. Furthermore, the combination of bauxite residue-based PAFC and PFS for synergy coagulation of such wastewater demonstrated an obvious positive effect. With the proportion between as-prepared PAFC and PFS to be 2.5:1, the COD of treated wastewater could be further reduced to meet the national level A standard of China, providing a promising route to solve the problem of substandard printing and dyeing sewage outfall by a simple coagulation strategy.更多还原