Plataforma Solar de Almería-CIEMAT, P.O. Box 22, 04200 Tabernas, Almería, Spain.
Laboratorio de Investigaciones Medioambientales de Zonas Áridas (LIMZA), EUDIM, Universidad de Tarapacá. Av. General Velásquez 1775, Arica, Chile.
J Hazard Mater. 2019 Jun 15;372:85-93. doi: 10.1016/j.jhazmat.2018.07.037. Epub 2018 Jul 10.
Photo-Fenton is a solar disinfection technology widely demonstrated to be effective to inactivate microorganisms in water by the combined effect of photoactivated iron species and the direct action of solar photons. Nevertheless, the precipitation of iron as ferric hydroxide at basic pH is the main disadvantage of this process. Thus, challenge in photo-Fenton is looking for alternatives to iron salts. Polycarboxylic acids, such as Ethylendiamine-N',N'-disuccinic acid (EDDS), can form strong complex with Fe and enhance the dissolution of iron in natural water through photochemical process. The aim of this study was to evaluate the disinfection effectiveness of solar photo-Fenton with and without EDDS in water. Several reagent concentrations were assessed, best bacterial (Escherichia coli and Enterococcus faecalis) inactivation was obtained with 0.1:0.2:0.3 mM (Fe:EDDS:HO) in isotonic water. The benefit of using EDDS complexes to increase the efficiency of kept dissolved iron in water at basic pH was proven. Solar disinfection and HO/solar with and without EDDS, and Fe:EDDS complexes were also investigated. Bacterial inactivation results in municipal wastewater effluents (MWWE) demonstrated that the competitive role of organic matter and inorganic compounds strongly affect the efficacy of Fe:EDDS at all concentrations tested, obtaining the fastest inactivation kinetics with HO/solar (0.3 mM).
光芬顿是一种太阳能消毒技术，通过光激活铁物种和太阳光子的直接作用的协同效应，已被广泛证明可有效灭活水中的微生物。然而，在碱性 pH 下铁以氢氧化铁沉淀是该过程的主要缺点。因此，光芬顿的挑战在于寻找铁盐的替代品。多羧酸，如乙二胺-N'，N'-二琥珀酸（EDDS），可以与 Fe 形成强配合物，并通过光化学过程增强铁在天然水中的溶解。本研究的目的是评估在有和没有 EDDS 的情况下，太阳能光芬顿在水中的消毒效果。评估了几种试剂浓度，在等渗水中，最佳细菌（大肠杆菌和粪肠球菌）灭活是在 0.1：0.2：0.3 mM（Fe：EDDS：HO）下获得的。证明了使用 EDDS 配合物在碱性 pH 下增加保持水中溶解铁效率的好处。还研究了太阳能消毒和 HO/太阳能，以及有和没有 EDDS 的情况，以及 Fe：EDDS 配合物。在市政废水（MWWE）中的细菌灭活结果表明，有机物和无机化合物的竞争作用强烈影响所有测试浓度下的 Fe：EDDS 的功效，以 HO/太阳能（0.3 mM）获得最快的灭活动力学。
