Electro-catalytic ozonation for improving the biodegradability of mature landfill leachate

Ghahrchi, Mina; Rezaee, Abbas

doi:10.1016/j.jenvman.2019.109811

Cited by 45 publications

(17 citation statements)

References 24 publications

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“…Therefore, the main reason for the increase in the BOD 5 /COD ratio was the increase in the BOD 5 concentration, and the decrease of COD amount was not significant. The results obtained in other studies to improve the biodegradability of wastewater confirms the results of this study (49,53). But, in the COP, the hydroxyl radical production and complete mineralization of organic compounds by these radicals led to a reduction in the concentration of BOD 5 and significantly COD, which increases the biodegradability of wastewater containing toxins.…”

Section: Discussionsupporting

confidence: 88%

“…However, it should be noted that the EC values in the COP, especially at a catalyst concentration of 4 g/L, were higher than those in the SOP. In a study by Ghahrchi et al, ozonation and electro-catalytic ozonation of toxic and recalcitrant compounds in mature landfill leachate were performed and it was found that the mineralization of complex compounds leads to an increase in EC and this increase is more noticeable in the electro-COP (49). These results indicate better performance of the COP in the mineralization of contaminants through the generation of radical hydroxyl, which is consistent with the results of several studies (50)(51)(52).…”

Section: Discussionsupporting

confidence: 75%

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Application of heterogeneous catalytic ozonation process for treatment of high toxic effluent from a pesticide manufacturing plant

Ghahrchi

Bazrafshan

Badan

et al. 2020

Environ Health Eng Manag

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Background: The discharge of untreated wastewater containing toxic and resistant compounds into the environment is a serious threat for ecosystems. Therefore, this study was conducted to evaluate the treatment of poison production factory wastewater using heterogeneous catalytic ozonation process (COP). Methods: Magnetic carbon nanocomposite was used as a catalyst at concentrations of 1, 2, and 4 g/L. Its effect on improving the treatment process was evaluated at reaction time of 30, 60, 90, and 120 minutes. At the end of each experiment, parameters including total organic carbon (TOC), chemical oxygen demand (COD), biological oxygen demand (BOD5 ), pH, electrical conductivity (EC), and turbidity were measured. Results: It was revealed that in single ozonation process (SOP), the maximum removal efficiencies of TOC, COD, and BOD5 were achieved at reaction time of 120 minutes as 56%, 40%, and 11.7%, respectively. By adding the catalyst to the wastewater, the treatment process was improved, so that the maximum removal efficiencies of COD (91%), TOC (73%), and BOD5 (74%) were obtained at catalyst concentration of 4 g/L. Under this condition, BOD5 /COD ratio increased from 0.22 to 0.64. Also, the results of analysis of ozone consumption per each mg of reduced COD showed that its amount sharply decreased from 2.1 mgO3 / mg COD removal in the SOP, to 0.34 mgO3 /mg COD removal in the COP. The results of kinetic reaction analysis also revealed that the rate constant increased from 0.007 to 0.02 min-1. Conclusion: According to the results, it can be concluded that the COP at a catalyst concentration of 4 g/L, by decomposing resistant compounds and increasing the biodegradability, can be used as a suitable pretreatment method for biological processes.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 75%

Application of heterogeneous catalytic ozonation process for treatment of high toxic effluent from a pesticide manufacturing plant

Ghahrchi

Bazrafshan

Badan

et al. 2020

Environ Health Eng Manag

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“…Principalmente, considerando os altos valores de umidade e temperatura, típicos do clima da região onde se encontra o vazadouro e a composição dos resíduos brasileiros em que predomina a matéria orgânica, Correia (2017) e van Elk et. al., (2019).…”

Section: Resultsunclassified

“…Contudo, a remoção de cor mais significativa foi verificada na amostra 4, contendo maior adição de H 2 O 2 e maior tempo de processo (60 mL de H 2 O 2 e 150 min de processo de ozonização). Resultados semelhantes foram encontrados por Chen et al(2019), que concluíram que o LA pode ser efetivamente tratado utilizando O 3 /H 2 O 2 , os autores afirmam ainda, que a adição de H 2 O 2 melhora o processo de ozonização, porém um excesso de H 2 O 2 pode acarretar em uma elevada geração de radicais hidroxila (responsáveis pela degradação), e isso leva a diminuição da degradação do LA devido reação entre os próprios radicais hidroxila.Figura 1 -LA bruto e as quatro amostras retiradas após o processo de ozonização/H 2 O 2 .…”

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Evolução do Conhecimento Científico na Engenharia Ambiental e Sanitária

Sant'Ana¹

2020

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Direitos para esta edição cedidos à Atena Editora pelos autores. Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição-Não-Comercial-NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0).O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.A Atena Editora não se responsabiliza por eventuais mudanças ocorridas nos endereços convencionais ou eletrônicos citados nesta obra.Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação.

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“…Transformation or mineralization of SON in real wastewater has been explored using OP treatment including high doses of hydrogen peroxide, potassium permanganate, sodium hypochlorite, or ozone (Randtke, Parkin, Keller, Leckie, & McCarty, 1978), and photodegradation using simulated sunlight exposure (Simsek, Wadhawan, & Khan, 2013). OPs have also been applied to increase the biodegradability of recalcitrant organic compounds in drinking water (acetic acid, formic acid, phenol, 4‐chlorophenol, 2,4‐dichlorophenol, and nitrobenzene) (Chamarro, Marco, & Esplugas, 2001), landfill leachate (Ghahrchi & Rezaee, 2020; de Morais & Zamora, 2005), and industrial wastewaters (Mantzavinos & Psillakis, 2004; Oller, Malato, & Sánchez‐Pérez, 2011; Popat, Nidheesh, Anantha Singh, & Suresh Kumar, 2019).…”

Section: Introductionmentioning

confidence: 99%

Impact of oxidation processes on the composition and biodegradability of soluble organic nutrients in wastewater effluents

Tooker

Gao

Onnis‐Hayden

et al. 2020

Water Environment Research

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The characteristics and bioavailability of wastewater derived organic nutrients and their susceptibility to removal technologies have implications in nutrient loading to aquatic environments and their contributions to eutrophication. Therefore, a better understanding of treatability of effluent organic nutrients is of interest for water resource recovery facilities (WRRFs) and regulators. Oxidation processes (OPs) can reduce concentrations of soluble organic nutrients and convert them into more biodegradable forms. In this study, three WRRF effluents were treated with low‐pressure ultraviolet (UV) irradiation, hydrogen peroxide (H2O2), and combined UV/H2O2. Untreated and treated effluents were subjected to nitrogen and phosphorus speciation analyses and soluble organic nitrogen (SON) biodegradability assays. The OP treatments did not change SON concentrations significantly. For two WRRFs, OP treatments decreased soluble organic phosphorus (SOP) and seemed to convert it into soluble acid hydrolyzable phosphorus (SAHP), indicating possible increases in phosphorus bioavailability. Fingerprinting and quantification of dissolved organic matter (DOM) using fluorescence spectroscopy with parallel factor analysis revealed changes in DOM pool composition in response to OPs treatments, which suggests likely organic nutrients composition changes. Based on biodegradability assessments, OP treatments likely changed the composition and biodegradability of effluent SON compounds. Combined UV/H2O2 treatment seemed more effective than other OPs at oxidizing some of the organic nutrients. Practitioner points Treatment of secondary or tertiary effluent with UV, H2O2, or UV/ H2O2 was generally not effective at mineralizing SON and SOP, when applied at the doses used in this study. Treatment resulted in observable changes in DOM compositions, likely including SON and SOP compounds. Combined UV/H2O2 treatment was more effective than UV or H2O2 alone at oxidizing some DOM compounds. The BSON (bioavailable SON) assay indicated that the composition of the SON pool in the effluents was likely changed by the OP treatments. This was supported by fluorescence spectroscopy analysis.

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Electro-catalytic ozonation for improving the biodegradability of mature landfill leachate

Cited by 45 publications

References 24 publications

Application of heterogeneous catalytic ozonation process for treatment of high toxic effluent from a pesticide manufacturing plant

Application of heterogeneous catalytic ozonation process for treatment of high toxic effluent from a pesticide manufacturing plant

Evolução do Conhecimento Científico na Engenharia Ambiental e Sanitária

Impact of oxidation processes on the composition and biodegradability of soluble organic nutrients in wastewater effluents

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