Microcontaminant removal in secondary effluents by solar photo-Fenton at circumneutral pH in raceway pond reactors

Obra, I. de la; Ponce-Robles, L.; Miralles-Cuevas, S.; Oller, Isabel; Malato, Sixto; Pérez, J.A. Sánchez

doi:10.1016/j.cattod.2016.12.028

Cited by 53 publications

(15 citation statements)

References 22 publications

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“…The highest addition of the amazonian fruit extract may represent a very elevated load of organic matter. Thus, the organic matter in excess could compete by the radicals ( (Klamerth et al 2013;Papoutsakis et al 2015;De la Obra et al 2017), and therefore a significant increase in the process efficiency does not occur. Indeed, it would be expected that a Fe: COPE ratio higher than 1: 0.25 will induce a detrimental effect on the pharmaceuticals removal by the SPF process.…”

Section: Influence Of Fe:cope Ratio On the Degradation Of Pollutantsmentioning

confidence: 99%

Improvement of solar photo-Fenton by extracts of amazonian fruits for the degradation of pharmaceuticals in municipal wastewater

Losada

Santanilla-Calderón

Serna-Galvis

et al. 2021

Environ Sci Pollut Res

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Extracts of copoazu (Theobroma gramdiflorum), canangucha (Maurita Flexuosa), and coffee (coffea arabica) were explored as enhancers of the solar photo-Fenton process to eliminate acetaminophen, sulfamethoxazole, carbamazepine, and diclofenac. The process performance, at pH 6.2 and 5 mg L -1 of iron without the extracts, has a very limited action (~35% of the pollutants degradation at 90 min of treatment) due to the iron precipitation. Interestingly, the extracts addition increased the soluble iron forms but only copoazu extract improved the pollutants degradation (~95% of elimination at 90 min of the process action). The copoazu extract acted as a natural complexing agent, maintaining the soluble iron up to 2 mg L -1 even after 90 min, and consequently enhancing the pollutants degradation. The effect of copoazu extract dose on the process performance was also assessed, finding that an iron: copoazu extract molar ratio equal to 1:0.16 was the most favorable condition. Then, the process improved by copoazu extract was applied to municipal wastewater.Remarkably, the process led to ~90% of total pharmaceuticals degradation at 20 min of treatment. This work evidences the feasibility of amazonian fruits extracts to improve the solar photo-Fenton process to degrade pharmaceuticals in aqueous matrices at near-neutral pH.

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Section: Influence Of Fe:cope Ratio On the Degradation Of Pollutantsmentioning

confidence: 99%

Improvement of solar photo-Fenton by extracts of amazonian fruits for the degradation of pharmaceuticals in municipal wastewater

Losada

Santanilla-Calderón

Serna-Galvis

et al. 2021

Environ Sci Pollut Res

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“…Nanoparticles are a preferable option, but it must be considered that a high density of suspended particles may block out the light source and reduce the efficiency of the process [63][64][65]. Raceway reactors, where the catalyst is not suspended but rests at the bottom of the raceway with the contaminated water flowing over it, eliminate such considerations but require high amounts of catalysts [66][67][68]. Here, the development of low-cost alternatives to highly specific nanoparticle materials is particularly interesting.…”

Section: Photocatalytic and Advanced Oxidation Processes In Water Trementioning

confidence: 99%

Metallurgical Wastes Employed as Catalysts and Photocatalysts for Water Treatment: A Review

et al. 2019

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Metallurgical slags are a mass-produced industrial solid waste, often destined to landfills; the volumes disposed represent an environmental burden. Over the last three decades, applications have been found for these wastes, mainly as a low-cost additive in building materials. More recently, their unique chemical properties have attracted attention to produce high-added-value materials for environmental applications, to be used as adsorbents, catalysts, or a source of reactive species in environmental engineering. Such uses can be classified as a function of the added value generated, technological complexity, and environmental impact. This review will focus specifically on the modification and use of slags for catalysis, photocatalysis, and photocatalytic production of hydrogen, which have received relatively little attention in literature. A summary will be presented about the general requirements for using unmodified slags as well as slag processed under alkaline or acidic conditions for advanced oxidation processes. Then, an overview will be given of the use of slags as photocatalysts in water treatment, organized according to the origin of the product (steel, copper, magnesium, ferromanganese), as well as emerging reports on the photocatalytic production of hydrogen, in contrast to the use of highly specific titania-based products developed for the same purpose.

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“…The photo-Fenton reaction can be summarized as a catalytic reaction of ferrous iron (Fe 2+ ) reagent with hydrogen peroxide in an acidic or circumneutral pH yielding hydroxyl radicals. The presence of UV-VIS radiation enhances the reaction rate; therefore, this process is strongly dependent on iron concentration and irradiance, which are important factors in reactor design and process operation [18]. Iron nanoparticles present higher surface energy than iron salts, and they have also been proposed and tested to substitute iron sulfate and reduce the sludge produced in the reactor [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and Application of 3D Printed Photo Fenton Reactors for Wastewater Treatment

Esfahani

Zandi

Travieso-Rodríguez

et al. 2021

IJERPH

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Additive manufacturing (AM) or 3D printing offers a new paradigm for designing and developing chemical reactors, in particular, prototypes. The use of 3D printers has been increasing, their performance has been improving, and their price has been reducing. While the general trend is clear, particular applications need to be assessed for their practicality. This study develops and follows a systematic approach to the prototyping of Advanced Oxidation Processes (AOP) reactors. Specifically, this work evaluates and discusses different printable materials in terms of mechanical and chemical resistance to photo-Fenton reactants. Metallic and ceramic materials are shown to be impracticable due to their high printing cost. Polymeric and composite materials are sieved according to criteria such as biodegradability, chemical, thermal, and mechanical resistance. Finally, 3D-printed prototypes are produced and tested in terms of leakage and resistance to the photo-Fenton reacting environment. Polylactic acid (PLA) and wood–PLA composite (Timberfill®) were selected, and lab-scale raceway pond reactors (RPR) were printed accordingly. They were next exposed to H2O2/Fe(II) solutions at pH = 3 ± 0.2 and UV radiation. After 48 h reaction tests, results revealed that the Timberfill® reactor produced higher Total Organic Carbon (TOC) concentrations (9.6 mg·L−1) than that obtained for the PLA reactor (5.5 mg·L−1) and Pyrex® reactor (5.2 mg·L−1), which suggests the interference of Timberfill® with the reaction. The work also considers and discusses further chemical and mechanical criteria that also favor PLA for 3D-printing Fenton and photo-Fenton reactors. Finally, the work also provides a detailed explanation of the printing parameters used and guidelines for preparing prototypes.

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Microcontaminant removal in secondary effluents by solar photo-Fenton at circumneutral pH in raceway pond reactors

Cited by 53 publications

References 22 publications

Improvement of solar photo-Fenton by extracts of amazonian fruits for the degradation of pharmaceuticals in municipal wastewater

Improvement of solar photo-Fenton by extracts of amazonian fruits for the degradation of pharmaceuticals in municipal wastewater

Metallurgical Wastes Employed as Catalysts and Photocatalysts for Water Treatment: A Review

Manufacturing and Application of 3D Printed Photo Fenton Reactors for Wastewater Treatment

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