Electrochemical oxidation of biological pretreated and membrane separated landfill leachate concentrates on boron doped diamond anode

Zhou, Bo; Yu, Zhaoju; Wei, Qiuping; Long, Hangyu; Xie, Youneng; Wang, Yijia

doi:10.1016/j.apsusc.2016.03.045

Cited by 137 publications

(37 citation statements)

References 53 publications

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“…These electrodes are therefore considered suitable for landfill leachate treatment regarding their properties: an inert surface with low adsorption properties and outstanding corrosion stability, even in acidic conditions [146]. High-quality BDD electrodes with excellent electrochemical property deposition on niobium (Nb) substrates by the hot filament chemical vapor deposition (HFCVD) method are an effective technique for landfill leachate treatment, as 87.5% COD and 74.06% NH 4 -N removal were achieved after 6 h treatment, with a specific energy consumption of 223.2 kWh·m −3 .…”

Section: Electro-oxidationmentioning

confidence: 99%

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

et al. 2016

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Abstract:Municipal solid waste final disposal represents an environmental burden worldwide since landfilling, or open dumping, is still the preferred solution for the end of life of solid discarded materials. This study aims to review the technological innovations applied for landfill leachate treatment, taking into consideration the experiences obtained during the past years and the solutions which have been implemented. The review showed that both biological and physiochemical treatments are not able to achieve the requested water quality level, according to the limits established by regulations, whether applied in a single treatment or multiple treatments. In order to respect sustainable release limits to guarantee environmental protection, the construction of depuration systems and combining biological and physiochemical treatment methods is considered of the utmost importance. The review looks at possible joint applications of different treatment techniques reviewed by other studies and considers the state of the art of current research. Combined technical solutions suggested within the 2016 peer-reviewed papers are presented and discussed as a sustainable way to effectively treat landfill leachate, giving particular attention to feasible solutions for developing countries.

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Section: Electro-oxidationmentioning

confidence: 99%

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

et al. 2016

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“…[32] Electrochemical methods (a typical AOP), in particular, have been extensively investigated for the treatment of organic and inorganic pollutants that are found in several types of effluents. [46][47][48][49][50][51][52][53][54][55][56][57][58][59] This indicates that the type of electrode material does not, per se, ensure greater efficiency in these processes. Depending on the electrode material, this species may be weakly adsorbed on the surface of the electrode, favoring mainly the mineralization of organic substances.…”

Section: Introductionmentioning

confidence: 99%

“…[31,32] In the case of electrochemical treatments of RLL, BDD electrodes have shown remarkably good performance superior to that of other electrode materials, as described in detail by Mandal et al [31] In addition, although process performance is strongly dependent on the initial condition of RLL (young or old), parameters such as COD removal rates and energy consumption have proved to differ significantly, even when the same electrode material is used (BDD). [46][47][48][49][50][51][52][53][54][55][56][57][58][59] This indicates that the type of electrode material does not, per se, ensure greater efficiency in these processes. In this context, specific knowledge about the management of parameters such as applied current density, inter-electrode gap, hydrodynamic regime, ratio of electrode surface area to effluent volume, reactor geometry, etc., is essential to ensure greater process efficiency.…”

Section: Introductionmentioning

confidence: 99%

Landfill Leachate Treatment by Combining Coagulation and Advanced Electrochemical Oxidation Techniques

et al. 2019

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This paper presents and discusses the results obtained in the treatment of raw landfill leachate (RLL) with a combination of coagulation-flocculation (Alum) and electrochemical techniques, using a filter-press reactor with a boron-doped diamond electrode. The success of the treatment was demonstrated by the quality of the treated water, which was evaluated based on parameters such as color, odor, turbidity, chemical oxygen demand, biochemical oxygen demand, free and total chlorine, total nitrite and nitrate, ammonia and microbiological tests (mesophiles and termotolerant coliforms). The best conditions for coagulation-flocculation involved a dosage of 20 mL/L Al 2 (SO 4 ) 3 (50 g/L) at pH 6.0. To reduce energy consumption, the electrochemical treatments were carried out by applying different limiting current density (i lim ) step sequences. This strategy reduced the energy consumed in the removal of the organic load by up to 40 % while maintaining a similarly effective mineralization rate (> 90 % COD removal) between the steps. Microbiological tests revealed that the number of mesophiles was more than twelve orders of magnitude lower after electrolysis, indicating the important sanitizing effect caused by the HClO/chloramine species generated in the process. Color, turbidity and ammoniacal nitrogen were completely eliminated from the treated leachate by the end of the electrolysis process.[a] M.

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“…O lixiviado de um aterro de resíduos sólidos apresenta, normalmente, elevados valores de demanda química de oxigênio (DQO), demanda bioquímica de oxigênio (DBO 5 ), concentração de nitrogênio amoniacal, toxicidade e recalcitrância, dificultando o tratamento por processos biológicos, principalmente no caso de aterros antigos (AMOR et al, 2015;ZHANG et al, 2017). Assim, é necessário o emprego de tratamentos prévios para reduzir os altos níveis de DQO, nitrogênio amoniacal, toxicidade e aumentar a relação DBO 5 /DQO, entre outros (LI et al, 2010;AMR et al, 2013;CORTEZ et al, 2011;MOREIRA et al, 2016;ZHOU et al, 2016), para um posterior tratamento biológico.…”

Section: Introductionunclassified

Tratamento de lixiviado por processos combinados: coagulação/floculação, air stripping, ozonização e lodo ativado

Webler

Mahler

Dezotti

2018

Eng. Sanit. Ambient.

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Eng Sanit Ambient | v.23 n.5 | set/out 2018 | 901-911 ¹Universidade Federal de Rondônia -Ji-Paraná (RO), Brasil. ²Universidade Federal do Rio de Janeiro -Rio de Janeiro (RJ), Brasil.RESUMO Os lixiviados de áreas de disposição de resíduos municipais apresentam, em geral, alta complexidade, variabilidade, toxicidade, recalcitrância e alta concentração de nitrogênio amoniacal. Neste estudo, aplicaram-se técnicas combinadas para o tratamento de um lixiviado, a saber: coagulação/ floculação (C/F), air stripping e ozonização, combinados com o tratamento por lodo ativado com/sem inserção de carvão ativado. O processo de C/F levou a uma redução na demanda química de oxigênio (DQO) de 58, 1% e na cor, de 85, 6%. O air stripping foi realizado em pH>12 e obteve-se diminuição dos níveis de nitrogênio amoniacal para abaixo de 60 mg.L -1 . O processo de ozonização, com consumo de ozônio de 397 mgO 3 .L -1 e 2.376 mgO 3 .L -1 , apresentou bons resultados, com aumento de 59,4% na relação DBO 5 /DQO e uma redução de toxicidade superior a 85%. Obteve-se melhor eficiência para o lodo ativado sem carvão ativado, com lixiviado pré-tratado por C/F + air stripping + ozonização (400 mgO 3 .L -1 ). Tal combinação resultou em uma redução de 90, 6% na DQO do lixiviado e mais de 99% nos níveis de nitrogênio amoniacal. ABSTRACTLeachate from waste disposal areas generally presents high complexity, variability, toxicity, recalcitrance and high concentration of ammonia nitrogen. In this work, combined techniques for the treatment of leachate were applied, namely: coagulation/flocculation, air stripping and ozonation combined with activated sludge treatment with/without activated carbon.The coagulation/flocculation process led to a COD reduction of 58.1% and color removal of 85.6%. The air stripping was performed at pH>12 and reduced ammonia levels below of 60 mg.L -1 . The ozonation process (ozone consumption of 397 mgO 3 .L -1 and 2376 mgO 3 .L -1 ) presented good results. It was observed a BOD 5 /COD increase of 59.4% and a toxicity reduction of more than 85%. The best efficiency was observed with sludge activated without activated carbon for the pre-treated leachate by coagulation/ flocculation + air stripping + ozonation (400 mgO 3 .L -1 ). This combination resulted in a COD reduction of 90.6% and more than 99% of ammonia nitrogen removal.

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Electrochemical oxidation of biological pretreated and membrane separated landfill leachate concentrates on boron doped diamond anode

Cited by 137 publications

References 53 publications

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

Landfill Leachate Treatment by Combining Coagulation and Advanced Electrochemical Oxidation Techniques

Tratamento de lixiviado por processos combinados: coagulação/floculação, air stripping, ozonização e lodo ativado

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