Mass Transfer Laboratory (LABMASSA), Departamento de Engenharia Química e Engenharia de Alimentos, Universidade Federal de Santa Catarina, PO Box 476, 88040-900, Florianópolis, SC, Brazil; Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
J Environ Manage. 2020 Oct 15;272:111082. doi: 10.1016/j.jenvman.2020.111082. Epub 2020 Jul 20.
The remediation of a real textile wastewater aiming its reuse in the textile industry was carried out by integrating two processes: (i) a chemical or electrochemical advanced oxidation process (AOP or EAOP) based on Fenton's reaction for organics degradation, and (ii) a cation exchange process using marine macroalgae for removal of the iron acting in the Fenton's reaction based processes. Four AOPs/EAOPs at acidic pH 2.8 were tested: Fenton, photo-Fenton with ultraviolet A (UVA) radiation (PF/UVA), electro-Fenton (EF) and photoelectro-Fenton with UVA radiation (PEF/UVA). These processes provided very high color removals. After a running time of 45 min, the color removals were 68-95% for the Fenton process, 76-94% for the EF process, 80-98% for the PF/UVA process and 85-100% for the PEF/UVA process. In contrast, the mineralization was negligible for all the processes, indicating the generation/presence of persistent colorless compounds. The PF process was selected as first treatment stage due to its ability for color removal and related lower costs. A set of six marine macroalgae (Gracilaria caudata, Gracilaria cervicornis, Ascophyllum nodosum, Fucus spiralis, Laminaria hyperborea and Pelvetia canaliculata) were tested for iron uptake. Laminaria hyperborea showed the highest ion exchange capacity and affinity for iron species. Its application allowed the removal of all the iron acting in the PF process (3.4 mg/L). The textile wastewater resulting from the application of PF process followed by cation exchange with Laminaria hyperborea was successfully reused in scouring, bleaching and dyeing processes.
采用集成两种工艺的方法对实际纺织废水进行修复，以实现其再利用于纺织工业：（i）基于芬顿反应的有机降解的化学或电化学高级氧化工艺（AOP 或 EAOP），以及（ii）使用海洋大型藻类去除铁的阳离子交换工艺，而铁在基于芬顿反应的工艺中起作用。测试了四种在酸性 pH 值 2.8 下的 AOP/EAOP：芬顿法（Fenton）、光芬顿法（PF）加紫外线 A（UVA）辐射（PF/UVA）、电芬顿法（EF）和光电化学芬顿法（PEF）加 UVA 辐射（PEF/UVA）。这些工艺提供了非常高的色度去除率。经过 45 分钟的运行时间，Fenton 工艺的色度去除率为 68-95%，EF 工艺为 76-94%，PF/UVA 工艺为 80-98%，PEF/UVA 工艺为 85-100%。相比之下，所有工艺的矿化作用都可以忽略不计，这表明生成/存在持久无色化合物。PF 工艺由于其去除色度的能力和相关的较低成本而被选为第一处理阶段。测试了六组海洋大型藻类（Gracilaria caudata、Gracilaria cervicornis、Ascophyllum nodosum、Fucus spiralis、Laminaria hyperborea 和 Pelvetia canaliculata）对铁的吸收能力。Laminaria hyperborea 表现出最高的离子交换能力和对铁物种的亲和力。其应用允许去除 PF 工艺中所有的铁（3.4 mg/L）。PF 工艺后应用阳离子交换法用 Laminaria hyperborea 处理的纺织废水成功地再用于煮练、漂白和染色过程。
