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Intensification of supercritical water oxidation (ScWO) process for landfill leachate treatment through ion exchange with zeolite.
Scandelai, Ana Paula Jambers; Zotesso, Jaqueline Pirão; Jegatheesan, Veeriah; Cardozo-Filho, Lucio; Tavares, Célia Regina Granhen.
Afiliação
  • Scandelai APJ; Department of Chemical Engineering, State University of Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020900 Maringá, Paraná, Brazil. Electronic address: paulascandelai@hotmail.com.
  • Zotesso JP; Department of Chemical Engineering, State University of Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020900 Maringá, Paraná, Brazil.
  • Jegatheesan V; School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.
  • Cardozo-Filho L; Department of Chemical Engineering, State University of Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020900 Maringá, Paraná, Brazil.
  • Tavares CRG; Department of Chemical Engineering, State University of Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020900 Maringá, Paraná, Brazil.
Waste Manag ; 101: 259-267, 2020 Jan 01.
Article em En | MEDLINE | ID: mdl-31634812
Over the past few years, supercritical water oxidation (ScWO) has shown great potential for application to landfill leachate treatment, providing substantial organic matter degradation in terms of biochemical oxygen demand (BOD), chemical oxygen demand (COD), and total organic carbon (TOC). However, the conversion of ammonia, which is present at high concentrations in leachates, is the rate-limiting step during ScWO and usually requires large amounts of oxidants, the addition of catalysts, or severe operating conditions. Aiming at proposing a treatment system that effectively removes both organic matter and ammonia from leachate, this paper evaluates the intensification of the ScWO process through ion exchange with zeolite. Thus, ScWO was operated under a pressure of 23 MPa at 600 and 700 °C, without the addition of oxidants. The zeolite (clinoptilolite) was used without any modification inside a glass column. The ScWO (600 °C)/zeolite system removed 90% ammoniacal nitrogen (NH3-N), 100% nitrite (NO2-N), 98% nitrate (NO3-N), color, and turbidity, 81% TOC, and 74% COD, suggesting that this system is a promising alternative for leachate treatment. However, the final NH3-N and COD values were slightly above the limits (20 and 200 mg L-1, respectively) stipulated by the Brazilian environmental legislation. These results suggest that further improvements are still required for the application of the intensified ScWO to be feasible. Notably, ammonium-saturated clinoptilolite is amenable for regeneration or can be applied to soil as a slow-release fertilizer.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Zeolitas País/Região como assunto: America do sul / Brasil Idioma: En Revista: Waste Manag Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2020 Tipo de documento: Article País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
Imprimir
XML
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Zeolitas País/Região como assunto: America do sul / Brasil Idioma: En Revista: Waste Manag Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2020 Tipo de documento: Article País de publicação: Estados Unidos