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, Lúcio; Tavares, Célia Regina Granhen

doi:10.1016/j.wasman.2019.10.005

Cited by 63 publications

(12 citation statements)

References 55 publications

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“…roethylene, and N-nitrosodimethylamine, are priority pollutants defined by US EPA [37] and were also observed in other leachates by Scandelai et al [38]. After electrochemical treatment, only 16 types of organic compounds were left and some of them were new in the effluents of the electrochemical treatment process.…”

Section: Analyzed By Gc-msmentioning

confidence: 65%

“…In terms of molecular structure, most of them were long-chain or circular organics with complex structures. Some of the compounds, such as chlorobenzene, 1,2,4-trichlorobenzene, 1,1-dichloroethylene, and N-nitrosodimethylamine, are priority pollutants defined by US EPA [37] and were also observed in other leachates by Scandelai et al [38]. After electrochemical treatment, only 16 types of organic compounds were left and some of them were new in the effluents of the electrochemical treatment process.…”

Section: Analyzed By Gc-msmentioning

confidence: 96%

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Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron

Tang

Yao

Xiao

et al. 2022

IJERPH

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Electrochemical oxidation of landfill leachate after biological treatment by a novel electrochemical system, which was constructed by introducing a corroding electrode of iron (Fec) between a boron-doped diamond (BDD) anode and carbon felt (CF) cathode (named as BDD–Fec–CF), was investigated in the present study. Response surface methodology (RSM) with Box–Behnken (BBD) statistical experiment design was applied to optimize the experimental conditions. Effects of variables including current density, electrolytic time and pH on chemical oxygen demand (COD) and ammonia nitrogen (NH3-N) removal efficiency were analyzed. Results showed that electrolytic time was more important than current density and pH for both COD and NH3-N degradation. Based on analysis of variance (ANOVA) under the optimum conditions (current density of 25 mA·cm−2, electrolytic time of 9 h and pH of 11), the removal efficiencies for COD and NH3-N were 81.3% and 99.8%, respectively. In the BDD–Fec–CF system, organic pollutants were oxidized by electrochemical and Fenton oxidation under acidic conditions. Under alkaline conditions, coagulation by Fe(OH)3 and oxidation by Fe(VI) have great contribution on organic compounds degradation. What is more, species of organic compounds before and after electrochemical treatment were analyzed by GC–MS, with 56 kinds components detected before treatment and only 16 kinds left after treatment. These results demonstrated that electrochemical oxidation by the BDD–Fec–CF system has great potential for the advanced treatment of landfill leachate.

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Section: Analyzed By Gc-msmentioning

confidence: 65%

Section: Analyzed By Gc-msmentioning

confidence: 96%

Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron

Tang

Yao

Xiao

et al. 2022

IJERPH

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“…The products of N-containing species include N 2 , nitrate, ammonia, nitrite, and NO x , depending on the state and position of N atoms in organics [37], reaction conditions [38], and the presence or absence of catalysts [39] or auxiliary fuels [40,41]. In the new study, ammonia can be effectively removed through ion exchange with zeolite in intensified SCWO process and ammonia removal was up to 97% when ion exchange was applied to SCWO as a subsequent step [42]. Nitrate is mainly obtained from the compounds containing nitro-group and diazonium, while ammonia is primarily produced from amino-group and N-heterocyclic compounds [37], and N 2 is formed through the interaction of amino and nitro group [43].…”

Section: N-containing Compoundmentioning

confidence: 86%

Review on Mechanisms and Kinetics for Supercritical Water Oxidation Processes

Jiang

Wang

et al. 2020

Applied Sciences

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Supercritical water oxidation (SCWO) is a promising wastewater treatment technology owing to its various advantages such as rapid reactions and non-polluting products. However, problems like corrosion and salt decomposition set obstacles to its commercialization. To address these problems, researchers have been developing the optimal reactor design and strengthening measures based on sufficient understandings of the degradation kinetics. The essence of the SCWO process and the roles of oxygen and hydrogen peroxide are summarized in this work. Then, the research status and progress of empirical models, semi-empirical models, and detailed chemical kinetic models (DCKMs) are systematically reviewed. Additionally, this paper is the first to summarize the research progress of quantum chemistry and molecular dynamics simulation. The challenge and further development of kinetics models for the optimization of reactors and the directional transformation of pollutants are pointed out.

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“…ScWO has been considered as a clean energy process. The heat released by the oxidation reaction could be converted to heat and shaft work, assuring a self-sustaining reaction and generating excess shaft power to drive both the high-pressure pump and the air compressor (Scandelai et al 2020). ScWO has been successfully used to treat different wastewaters characterized by a high COD and a high heavy metal concentration.…”

Section: Supercritical Water Oxidation (Scwo)mentioning

confidence: 99%

“…Thus, O 3 /ScWO may have high potential as a LFL treatment. More recently, Scandelai et al (2020) demonstrated the great potential of the application of ScWO in combination with zeolite to landfill leachate. Thus, ScWO was performed at a pressure of 23 MPa and at 600 or 700 °C.…”

Section: Supercritical Water Oxidation (Scwo)mentioning

confidence: 99%

Recent technologies for leachate treatment: a review

Cherni

Elleuch

Messaoud

et al. 2021

Euro-Mediterr J Environ Integr

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Municipal solid waste leachate, a kind of wastewater, can severely damage the environment and contaminate the groundwater because of its high organic matter and toxic heavy metal concentrations. Due to its complex composition, this wastewater must be properly treated prior to being discharged into the environment. In recent decades, several biological approaches (e.g., bioremediation, phytoremediation, and bioreactors) and physicochemical processes (e.g., coagulation/flocculation, air stripping, and advanced oxidation processes) have proven effective at removing the organic load and the toxicity of this effluent. Physicochemical treatments have been applied as pretreatment or post-treatment steps for biological processes, but these methods do not always provide satisfactory results and can cause secondary pollution in some cases. In addition, owing to the high concentrations of organic matter, ammonia, and trace metals in landfill leachate, combined approaches to leachate treatment have been reported to be efficient. This article highlights the advantages and drawbacks of these approaches to the treatment of leachate by providing an updated overview of the various methods that have been successfully applied in this field. Further studies should focus on improving landfill leachate treatment to maximize removal performance.

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Intensification of supercritical water oxidation (ScWO) process for landfill leachate treatment through ion exchange with zeolite

Cited by 63 publications

References 55 publications

Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron

Electrochemical Oxidation of Landfill Leachate after Biological Treatment by Electro-Fenton System with Corroding Electrode of Iron

Review on Mechanisms and Kinetics for Supercritical Water Oxidation Processes

Recent technologies for leachate treatment: a review

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