【摘要】 印染废水中锑的排放标准日趋严格,是印染废水处理面临的新挑战.以混凝和强化混凝去除印染废水中锑（Ⅴ）为目标,发现聚硫酸铁（PFS）混凝剂对印染废水中锑（Ⅴ）的去除效率显著优于铁铝复配混凝剂和铝盐混凝剂,去除效率达97.4%,出水锑（Ⅴ）浓度可达<4μg·L^-1.酸性条件（低水解度）有利于PFS生成Fe（a）活性组分和静电吸引、锑（Ⅴ）迁移,且絮体颗粒较小,促进PFS混凝除锑（Ⅴ）效率;酸性条件下PFS除锑（Ⅴ）效率是中性条件的1.27倍,处理出水中锑（Ⅴ）浓度仅为中性条件的33.3%.PFS投加量与除锑（Ⅴ）效率符合反比例模型.在较高锑（Ⅴ）浓度下,提升PFS投加量可提高除锑（Ⅴ）效率,但在较低锑（Ⅴ）浓度下,提升PFS投加量对除锑（Ⅴ）效率的促进较小.PFS絮体回流与混凝沉淀串联或耦合可显著提升印染废水中锑（Ⅴ）的去除效率,其除锑（Ⅴ）效率分别是单一PFS混凝沉淀的1.14倍和1.32倍,可有效降低出水锑（Ⅴ）浓度并节约PFS投加量和减少污泥生成量.其中混凝-絮体回流耦合工艺中,最佳絮体回流比例为100%.更多还原

【Abstract】 The disposal limitation of antimony is becoming more and more strict, and so the removal of antimony is a new challenge in the dyeing and finishing wastewater treatment. Conventional and enhanced coagulation were employed for the dyeing wastewater treatment to remove antimony(Ⅴ). It is found that poly ferric sulfate(PFS) can remove antimony(Ⅴ) with an efficiency of 97.4%, outperforming the aluminum coagulants. PFS achieved 1.27-fold higher efficiency under acidic condition than under basic condition, because PFS formed more active species of Fe(a) and was protonated at lower pH. The removal efficiency of antimony(Ⅴ) was reversely related to the PFS dosage at various initial antimony(Ⅴ) concentrations. alThough higher removal efficiency was achieved with higher PFS dosage, but it doesn′t work under low antimony(Ⅴ) concentration. Thus, the floc backflow and coagulation were employed in tandem or in coupling mode, achieving 1.14 times and 1.32 times higher efficiencies than the sole coagulation, respectively. A floc backflow ratio of 100% was optimal In the synergy mode of coagulation-backflow.更多还原