The efficiency of nanoscale zero-valent iron (nZVI) for the recalcitrant organic pollutants degradation has been frequently reported. However, some disadvantages such as low hydraulic conductivity, rapid passivation and consequent loss of reactivity have motivated researchers to study immobilized forms. In this work, calcium alginate beads incorporated with nZVI were prepared, characterized and applied in a catalytic ozonation system of Reactive Red 195 dye (RR195). In order to avoid shearing the calcium alginate beads, an Air lift reactor operated with Air/O₃ cycles in an 8 mg L⁻¹ concentration was used. The RR195 treatability tests conducted with a dye concentration of 25 mg L⁻¹, 50 g L⁻¹ of nZVI-Alg beads and an Air/O₃ feed flow of 1 L min⁻¹, revealed significant process efficiency, which was not limited only to the dye discoloration. Total discoloration levels were observed in 30 min of treatment and reductions in 97 % of organic matter in 90 min of treatment, measured through the chemical oxygen demand. The typical absorptions of aromatic compounds reduction (λ_max =290 nm) and the acute toxicity reduction (Artemia Saline bioassay), contribute to the Alg-nZVI/O₃ system potential for the application in the treatment of liquid effluents contaminated with dyes.

纳米级零价铁（nZVI）对于难降解的有机污染物降解的效率已被频繁报道。然而，诸如水力传导率低，快速钝化以及随之而来的反应性丧失等一些缺点促使研究人员研究固定化形式。在这项工作中，制备了与nZVI结合的海藻酸钙珠粒，对其进行了表征并应用于活性红195染料（RR195）的催化臭氧氧化系统中。为了避免剪切藻酸钙珠，使用了以8mg L ^-1浓度的空气/ O ₃循环运行的气升反应器。使用25 mg L ^-1的染料浓度，50 g L ^-1的nZVI-Alg珠粒和空气/ O进行的RR195可处理性测试1 L min ^-1的₃进料流量显示出显着的加工效率，不仅限于染料变色。通过化学需氧量测量，在30分钟的处理过程中观察到总变色水平，在90分钟的处理过程中减少了97％的有机物。芳香族化合物的典型吸收减少（_λmax = 290 nm）和急性毒性减少（卤虫生理盐水测定），有助于Alg-nZVI / O ₃系统潜力，可用于处理被染料污染的液体废水。