Degradation of surfactant used in iron mining by oxidation technique: Fenton, photo‐Fenton, and H₂O₂/UV—A comparative study

Abstract

Reuse of water in mining helps reduce the volume of tailings directed to dams, avoiding overloads and ruptures, as occurred in Brumadinho, Brazil. Water reuse in mining requires treatment mainly for removing the surfactant substances used. Photo-Fenton and UV/H 2 O 2 showed 96% to 98% degradation results of anionic surfactants within 5 minutes, suggesting this technique is faster than biological systems that can take days. This paper aims to study the degradation of a surfactant used in the flotation process by UV/H 2 O 2 , Fenton, and photo-Fenton oxidation techniques. The compound was characterized by FTIR and MALDI-TOF. In degradation experiments, the variation in reactants concentrations was evaluated with hydrogen peroxide, iron sulphate heptahydrate, and oxalic acid. We used a synthetic solution of surfactant in the reverse flotation of ore with 180 mg/L. The reaction was monitored with TOC analysis and a spectrophotometer throughout the reaction. The UV/H 2 O 2 and

Study Of Hematite Ore As A Source Of Iron For The Degradation Of Ether Amines Contained In Mining Wastewaters By The Fenton Reaction

“…Therefore, treating effluents is necessary to remove toxic species that pose a risk to the environment. Numerous studies in literature view biodegradation [18], adsorption [19], ozonization [20], Fenton, and photo-Fenton [21,22], photolysis [23] and electrolysis [24] are effectivies in treat this type of contaminants.…”

“…species on a solution faster than with Fe ions available (Equations 4 and 5) decreasing the degradation efficiency [31,39]. On the other side, the 1:1 stoichiometry of mineralization is not always obeyed considering that the radicals' species on Fenton reactions can also be originated by other mechanisms that occur in parallel (Equations 6) [21].…”

Estudo da degradação de surfactante xantato em efluente aquoso a partir de sistema cobre-Fenton homogêneo.

“…Entre os métodos, a degradação de xantatos já foi estudada utilizando o método de adsorção (Amrollahi et al, 2019;Bian et al,2021;Rezaei et al, 2019), de processos oxidativos avançados (AOPs) como ozonização (Fu et al, 2015), eletrólise e fotoeletrooxidação (Molina et al, 2013) e técnicas Fenton e Foto-Fenton (García-Leiva et al Com a remoção do hidrogênio, o carbono da molécula orgânica fica oxidado, o que pode levar a uma série de reações de degradação oxidativa e, eventualmente, à mineralização completa do contaminante (Nogueira et al, 2007;Falconi et al, 2020). Os POA vêm se consolidando como uma eficiente técnica de tratamento de efluentes contaminados que não conseguem ser completamente tratados através dos processos biológicos ou dos tratamentos convencionais da água.…”