Treatment of winery wastewater by sulphate radicals: HSO 5 − /transition metal/UV-A LEDs

Rodríguez-Chueca, Jorge; Amor, Carlos; Silva, Tânia; Dionysiou, Dionysios D.; Puma, Gianluca Li; Lucas, Marco S.; Peres, José A.

doi:10.1016/j.cej.2016.04.135

Cited by 90 publications

(50 citation statements)

References 47 publications

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“…Co(II) has been reported as one of the most effective metal catalyst for the activation of HSO 5 -, promoting a radical sulphate complex mechanism (Sun, Li, Feng & Tian, 2009;Rivas et al, 2012). The reduction of Co(III) to Co(II) mediated by the oxidation of monopersulphate is thermodynamically feasible (0.82 V) and fast, and the process proceeds cyclically many times until monopersulphate is totally consumed (Rodriguez-Chueca et al, 2017). Actually, all catalytic assays showed total decomposition of the oxidant for contact times ranging from 15min.…”

Section: Discussionmentioning

confidence: 99%

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Wastewater treatment of biodiesel production using persulphate ion as an oxidant

Borralho

Pardal

Coelho

2019

mill

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22 RESUMO Introdução: A produção de biodiesel produz um efluente altamente poluente, apresentando altos valores de Carência Química de Oxigênio (CQO), óleos e gorduras, entre outros contaminantes. O persulfato de sódio é um poderoso oxidante (Eº = 2.1V). Além da oxidação direta que é favorecida em meios alcalinos, ela pode ser induzida por processos fotolíticos, fotos catalíticos e / ou catalíticos formando radicais sulfato (Eº = 2.6 V), proporcionando mecanismos de reação com radicais livres como radicais hidróxilo. Objetivos: Neste trabalho foi testado o efeito do composto monopersulfato de potássio (2KHSO5KHSO4K2SO4), (Oxone) na remoção da CQO em água residual da etapa de purificação do biodiesel. Resultados: Os ensaios, oxidação direta a pH alcalino e oxidação catalítica com iões cobalto, Co (II), mostraram que os primeiros, para concentrações de Oxone de 1.00x10-2 M e 4.00x10-3 M, não foram efetivos, pois não houve decomposição do mesmo, para tempos de reação de três horas, não tendo ocorrido, portanto, remoções da CQO. Nos ensaios catalíticos foram testadas combinações variando entre 5.00x10-3 M e 7.50x10-2 M para o oxidante e 0.10 μM e 1.00 μM para o catalisador. A decomposição completa do oxidante foi sempre verificada entre 15 min. e 2 h. Os testes com menor concentração de cobalto mostraram taxas de remoção de CQO em torno de 20% enquanto as maiores atingiram os 60%. Conclusões: O ensaio mais favorável consegue remoções significativas da CQO, mas não o suficiente para que o efluente seja descarregado em meio hídrico, de acordo com a legislação portuguesa. Palavras-chave: "Monopersulfato de potássio", "Oxidação química", "Carência Química de Oxigênio", "Águas residuais da purificação do biodiesel".

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Section: Discussionmentioning

confidence: 99%

“…Moreover, Oxone is relatively stable at room temperature and easy to handle since is available in powder form (Rodriguez-Chueca et al, 2017). So, this work was intended to study the effect of the potassium monopersulphate compound in the removal of chemical oxygen demand (COD) of wastewater from the biodiesel purification stage.…”

Section: State Of Artmentioning

confidence: 99%

Wastewater treatment of biodiesel production using persulphate ion as an oxidant

Borralho

Pardal

Coelho

2019

mill

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“…PMS and PS activation can occur by various methods such as heat, UV, ultrasound or heterogeneous and homogeneous catalysis [26,32]. Nevertheless, combination of two or more different methods has been widely studied to increase the efficiency [34][35][36].…”

Section: Somentioning

confidence: 99%

“…Structure UV, ultrasound or heterogeneous and homogeneous catalysis [26,32]. Nevertheless, combination of two or more different methods has been widely studied to increase the efficiency [34][35][36]. The main goal of this chapter is to analyse and compare the various activation methods of PS and PMS, and to show the advances during the last years in the use of sulfate radicals-based AOPs, especially in disinfection and removal of micropollutants present in water and wastewater.…”

Section: Pms Psmentioning

confidence: 99%

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Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

Guerra-Rodríguez

Rodríguez

Singh

et al. 2018

Water

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238

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High oxidation potential as well as other advantages over other tertiary wastewater treatments have led in recent years to a focus on the development of advanced oxidation processes based on sulfate radicals (SR-AOPs). These radicals can be generated from peroxymonosulfate (PMS) and persulfate (PS) through various activation methods such as catalytic, radiation or thermal activation. This review manuscript aims to provide a state-of-the-art overview of the different methods for PS and PMS activaton, as well as the different applications of this technology in the field of water and wastewater treatment. Although its most widespread application is the elimination of micropollutants, its use for the disinfection of wastewater is gaining increasing interest. In addition, the possibility of combining this technology with ultrafiltration membranes to improve the water quality and lifespan of the membranes has also been discussed. Finally, a brief economic analysis of this technology has been undertaken and the different attempts made to implement it at full-scale have been summarized. As a result, this review tries to be useful for all those people working in that area.

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Photocatalytic Advanced Oxidation Processes for Water Treatment: Recent Advances and Perspective

Liu

Wang

2020

Chemistry An Asian Journal

190

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Nowadays, an ever-increasing variety of organic contaminants in water has caused hazards to the ecological environment and human health. Many of them are persistent and non-biodegradable. Various techniques have been studied for sewage treatment, including biological, physical and chemical methods. Photocatalytic advanced oxidation processes (AOPs) have received increasing attention due to their fast reaction rates and strong oxidation capability, low cost compared with the non-photolytic AOPs. This review is dedicated to summarizing up-to-date research progress in photocatalytic AOPs, such as Fenton or Fenton-like reaction, ozonation and sulfate radical-based advanced oxidation processes. Mechanisms and activation processes are discussed. Then, the paper summarizes photocatalytic materials and modification strategies, including defect chemistry, morphology control, heterostructure design, noble metal deposition. The future perspectives and challenges are also discussed.

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Treatment of winery wastewater by sulphate radicals: HSO 5 − /transition metal/UV-A LEDs

Cited by 90 publications

References 47 publications

Wastewater treatment of biodiesel production using persulphate ion as an oxidant

Wastewater treatment of biodiesel production using persulphate ion as an oxidant

Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

Photocatalytic Advanced Oxidation Processes for Water Treatment: Recent Advances and Perspective

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