Federal University of Santa Catarina - USFC, Department of Chemical and Food Engineering, Florianópolis, SC, Zip code: 88040-900, Brazil.
Federal University of Santa Catarina - USFC, Department of Chemical and Food Engineering, Florianópolis, SC, Zip code: 88040-900, Brazil.
J Hazard Mater. 2018 Oct 15;360:82-88. doi: 10.1016/j.jhazmat.2018.07.102. Epub 2018 Aug 2.
The oxidative systems including enzymatic systems have been widely studied as an alternative for textile effluents treatment. However, studies have shown that some oxidative processes can produce degradation products with higher toxicity than the untreated dye. In this work, enzymatic dye decolorization was evaluated by horseradish peroxidase enzyme (HRP) and the toxicity of discoloration products was evaluate against Daphnia magna, Euglena gracilis algae, and Vibrio fischeri. Dye decolorization kinetics data were evaluated and the pseudo-second-order model showed the best-fitting to the experimental data. In addition, it was observed an increased acute and chronic toxicity associated with the decolorization efficiency. The Reactive Blue 19 and Reactive Black dye showed the highest toxicity against D. Magna (16 toxicity factor) and V. Fischeri (32 toxicity factor) after enzymatic decolorization. For the chronic toxicity against D. Magna, Reactive Red was the only dye with no fertility inhibition. In relation to toxicity tests with E. gracilis algae, it was not observed photosynthetic inhibition for all dyes. This study verified the viability of the enzyme horseradish peroxidase in the textile dyes decolorization and the importance to evaluate the decolorization products.
氧化系统，包括酶系统，已被广泛研究作为纺织废水处理的替代方法。然而，研究表明，一些氧化过程会产生比未处理染料毒性更高的降解产物。在这项工作中，通过辣根过氧化物酶（HRP）评估了酶促染料脱色，并用大型溞、绿眼虫藻类和发光菌评估了脱色产物的毒性。评估了染料脱色动力学数据，伪二级模型显示最适合实验数据。此外，还观察到与脱色效率相关的急性和慢性毒性增加。经酶促脱色后，活性蓝 19 和活性黑染料对大型溞（16 毒性因子）和发光菌（32 毒性因子）表现出最高的毒性。对于大型溞的慢性毒性，活性红是唯一没有生育抑制的染料。关于与绿眼虫藻类的毒性试验，所有染料均未观察到光合作用抑制。这项研究验证了辣根过氧化物酶在纺织染料脱色中的可行性，以及评估脱色产物的重要性。
