Application of a Fenton process after a biological nitrification treatment: A successful case for leachate treatment

Traid, Hernán Darío; Vera, María L.; Escalada, G; López, Iván Emanuel; Dwojak, Anabela Natalia; Litter, Marta I.

doi:10.1016/j.cscee.2022.100208

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Fenton‐like systems are commonly used to treat landfill leachate and perform well in organic pollutant removal (Traid et al, 2022; Vilardi et al, 2018). Compared with the conventional homogeneous Fenton system, the zero‐valent iron (Fe 0 )‐based Fenton‐like system can produce less iron‐based sludge and activate H 2 O 2 to produce • OH through the continuous release of Fe 2+ , which can enhance the efficiency of organic matter removal in the system (Ghauch et al, 2011; Li et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

An assessment of the UV/nFe⁰/H₂O₂ system for the removal of refractory organics in the effluent produced by the biological treatment of landfill leachate

Feng

Fang

et al. 2022

Water Environment Research

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The removal efficiency and mechanism of the ultraviolet/nanoscale Fe 0 /H 2 O 2 (UV/nFe 0 /H 2 O 2 ) system for refractory organics in membrane bioreactor effluent were investigated. The most effective removal of organics was achieved at initial pH = 3.0, H 2 O 2 dosage = 50 mM, nFe 0 dosage = 1.0 g/L, and UV power = 15 W, with a reaction time of 60 min. Under these conditions, the absorbance at 254 nm, chromaticity, and total organic carbon removal efficiencies were 65.13%, 79.67%, and 61.51%, respectively, and the aromaticity, humification, molecular weight, and polymerization of organics were all significantly reduced. The surface morphology and elemental valence analysis of nano zero-valent iron (nFe 0 ) before and after the reaction revealed the formation of iron-based (hydrated) oxides, such as Fe 2 O 3 , Fe 3 O 4 , FeOOH, and Fe (OH) 3 , on the surface of the nFe 0 . Refractory organics were removed by Fenton-like reactions in the homogeneous and heterogeneous adsorptionprecipitation of iron-based colloids. At the same time, UV radiation accelerated the formation of Fe 2+ on the nFe 0 surface and promoted the Fe 3+ /Fe 2+ redox cycle to a certain extent, enhancing the removal of refractory organics. The results provide a theoretical basis for the application of the UV/nFe 0 /H 2 O 2 system to remove refractory organics in the effluent produced by the biological treatment of landfill leachate. Practitioner points• The UV/nFe 0 /H 2 O 2 process is effective in refractory organics removal in leachate treatment.• Humus in leachate was largely destroyed and mineralized by the UV/nFe 0 /H 2 O 2 process.• Active nFe 0 material participated in the Fenton-like process and was promoted by UV.• The effects of nFe 0 material and UV introduction were investigated.

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Section: Introductionmentioning

confidence: 99%

An assessment of the UV/nFe⁰/H₂O₂ system for the removal of refractory organics in the effluent produced by the biological treatment of landfill leachate

Feng

Fang

et al. 2022

Water Environment Research

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“…Advanced oxidation processes (AOPs), such as the Fenton process, can achieve the oxidation or even the mineralization of refractory organic matter in wastewater by generating hydroxyl radicals (HO • ) and other reactive oxygen species (Huang et al, 2021; Pisharody et al, 2022). Fenton processes, as classical AOPs, have been widely used in landfill leachate treatment (Brasil et al, 2021; Traid et al, 2022; Wu et al, 2021). The principle is that hydrogen peroxide (H 2 O 2 ) is activated by ferrous ions (Fe 2+ ) to generate a large amount of HO • (Li et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Removal of refractory organics from landfill leachate by in situ electrogenerated H₂O₂ combined with an Fe⁰ Fenton-like process

Bai

et al. 2022

Waste Manag Res

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Landfill leachate contains a large amount of refractory organic matter, which will cause harm to the environment if not appropriately treated. In this study, the refractory organic matter in landfill leachate has been treated by in situ electrogenerated H2O2 combined with an Fe0 Fenton-like process, aiming to explore a cleaner and more efficient process for leachate treatment. The results showed that the current, initial pH and oxygen flow rate have significant influences on H2O2 production. The current and oxygen flow rate are positively correlated with H2O2 production, and neutral conditions are more favourable. Under the conditions of a current of 200 mA, an initial pH of 7.0 and an oxygen flow rate of 0.3 L/min, H2O2 production reached 2.81 mM, the current efficiency was close to 80% and the highest removal efficiency of organic matter reached 40.70%. The absorbance at 280 nm ( E280) decreased from 0.1669 to 0.1180, and the ratios E240/ E420, E250/ E365 and E300/ E400 in the UV and visible regions changed from 0.7825, 5.4492 and 0.2422 to 1.3135, 7.3745 and 0.2966, respectively. The maximum fluorescence intensities due to humic-like acid and fulvic-like acid substances decreased from 1275 and 1246 to 595.9 and 711.0, respectively. Spectral analysis further showed that the complex structure of refractory organic matter in the landfill leachate was obviously destroyed, and the relative content of humus decreased significantly. This study may provide a theoretical basis for the effective treatment of refractory organic matter in landfill leachate by in situ electrogenerated H2O2 combined with a Fenton-like process.

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Removal characteristics of ammonia nitrogen and refractory organic matter in waste leachate by Co2+/peroxymonosulfate process at high chloride ion concentration

Feng

Bao

et al. 2022

Journal of Environmental Chemical Engineering

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Application of a Fenton process after a biological nitrification treatment: A successful case for leachate treatment

Cited by 3 publications

References 24 publications

An assessment of the UV/nFe⁰/H₂O₂ system for the removal of refractory organics in the effluent produced by the biological treatment of landfill leachate

An assessment of the UV/nFe⁰/H₂O₂ system for the removal of refractory organics in the effluent produced by the biological treatment of landfill leachate

Removal of refractory organics from landfill leachate by in situ electrogenerated H₂O₂ combined with an Fe⁰ Fenton-like process

Removal characteristics of ammonia nitrogen and refractory organic matter in waste leachate by Co2+/peroxymonosulfate process at high chloride ion concentration

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Application of a Fenton process after a biological nitrification treatment: A successful case for leachate treatment

Cited by 3 publications

References 24 publications

An assessment of the UV/nFe0/H2O2 system for the removal of refractory organics in the effluent produced by the biological treatment of landfill leachate

An assessment of the UV/nFe0/H2O2 system for the removal of refractory organics in the effluent produced by the biological treatment of landfill leachate

Removal of refractory organics from landfill leachate by in situ electrogenerated H2O2 combined with an Fe0 Fenton-like process

Removal characteristics of ammonia nitrogen and refractory organic matter in waste leachate by Co2+/peroxymonosulfate process at high chloride ion concentration

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An assessment of the UV/nFe⁰/H₂O₂ system for the removal of refractory organics in the effluent produced by the biological treatment of landfill leachate

An assessment of the UV/nFe⁰/H₂O₂ system for the removal of refractory organics in the effluent produced by the biological treatment of landfill leachate

Removal of refractory organics from landfill leachate by in situ electrogenerated H₂O₂ combined with an Fe⁰ Fenton-like process