Laboratory for Research on Advanced Processes for Water Treatment, Instituto de Ingeniería, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, Querétaro, Mexico.
J Hazard Mater. 2012 May 30;217-218:293-300. doi: 10.1016/j.jhazmat.2012.03.036. Epub 2012 Mar 22.
Three reagent dosing strategies used in the solar photo-assisted decolorization of a mixture of sulfonated dyes consisting of acid blue 113, acid orange 7 and acid red 151 were evaluated. Results demonstrated that the dosing strategy influenced both reagent consumption and the biodegradability and toxicity of the effluent. In one strategy (E(1)), the Fenton's reactants were dosed in a punctual mode, while in the other two strategies (E(2) an E(3)), the reactants were dosed continuously. In the E(2) strategy the reactants were dosed by varying the duration of the injection time. In the E(3) strategy, the reactants were dosed during 60 min at a constant rate, but with different concentrations. All cases showed that feeding the reactor between 40% and 60% of the maximal dose was sufficient to decolorize more than 90% of the mixture of azo dyes. The E(1) strategy was less effective for aromatic content reduction. Conversely, the continuous addition of the reagents (E(2) and E(3) strategies) improved the aromatic content removal. E(3) strategy was substantially more appropriate than E(1) strategy due to improved the effluent quality in two key areas: toxicity and biodegradability.
三种试剂投加策略用于光助太阳能处理由酸性蓝 113、酸性橙 7 和酸性红 151 组成的混合偶氮染料，结果表明，投加策略既影响试剂消耗，又影响废水的生物降解性和毒性。在一种策略（E(1)）中，Fenton 试剂以点状模式投加，而在另外两种策略（E(2)和 E(3)）中，试剂连续投加。在 E(2)策略中，通过改变注射时间的持续时间来投加反应物。在 E(3)策略中，以恒定速率但不同浓度的方式在 60 分钟内投加反应物。所有情况下，在反应器中加入 40%到 60%的最大剂量足以使超过 90%的偶氮染料混合物脱色。对于芳香族化合物含量的减少，E(1)策略效果较差。相反，连续添加试剂（E(2)和 E(3)策略）提高了芳香族化合物的去除率。E(3)策略比 E(1)策略更合适，因为它提高了废水在两个关键领域的质量：毒性和生物降解性。
