Degradation of recalcitrant organics in landfill concentrated leachate by a microwave-activated peroxydisulfate process

Gu, Zhepei; Chen, Wei-Ming; Li, Qibin; Wang, Ying; Wu, Chuanwei; Zhang, Aiping

doi:10.1039/c8ra06543h

Cited by 42 publications

(8 citation statements)

References 55 publications

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“…Therefore, the value determined for P12, for a landfill launched in 1989, can be considered similar to the 35-year old landfill studied by Lima et al (2017). On the other hand, the value obtained for P11 is similar to that obtained by Gu et al (2018), who obtained an absorbance value of 6.17 at 254 nm, with a BOD/COD ratio of 0.01.…”

Section: Resultssupporting

confidence: 82%

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Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Monteiro

Barquilha²,

Braga³

2020

REGET

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Landfill sanitary leachate is an effluent with complex characteristics that still presents some challenges for treatment. From the stabilization of the organic matter which occurs over the years in a landfill, the leachate biodegradability decreases, decreasing the biological treatment efficiency. The objective of this research was to identify the characteristics of leachate from an old landfill, located in Curitiba-BR, using conventional and spectroscopic methods. Two collects of raw leachate were carried out at the Curitiba Municipal Landfill in different periods, which were denominated P11 and P12. The analyzes performed were pH, COD, BOD, DOC, color and solids, as well as UV-Vis and fluorescence spectroscopies. The results indicated that the leachate was influenced by precipitation taxes and it is possible to infer that this landfill is in the aging process, since the leachate presented recalcitrant characteristics. The organic matter presented a strong humification degree due to the presence of aromatic substances, such as humic and fulvic acids, indicating that physical-chemical treatment should be applied to this leachate. In addition, the spectroscopic analysis brought additional information, with a quicker and lower reagent consumption than conventional methods. Thus, these spectroscopic techniques can be considered promising tools to monitor the leachate, assist in the identification of the landfill decomposition stage, and subsidize the planning for proper leachate treatment.

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Section: Resultssupporting

confidence: 82%

“…analyzed presented values of HIX close to 10, this indicates that the samples presented strong humic characteristics. Gu et al (2018), who studied leachate generated in China with a BOD/COD ratio of 0.01, obtained a HIX value of 8.96. This value was lower than that observed for the leachate used in this study.…”

Section: Resultsmentioning

confidence: 99%

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Monteiro

Barquilha²,

Braga³

2020

REGET

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“…The relative aromatic compound content of the SAARB effluent was characterised by UV 254 absorbance (Gu et al, 2019a). Chromaticity was expressed by the CN (Gu et al, 2018), which was calculated as follows (1)…”

Section: Methodsmentioning

confidence: 99%

Degradation of refractory organic matter in the effluent from a semi-aerobic aged refuse biofilter-treated landfill leachate by a nano-Fe₃O₄ enhanced ozonation process

Huang

2021

Waste Manag Res

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In this study, the transformation and degradation mechanisms of refractory organic matter in biologically treated leachate from a semi-aerobic aged refuse biofilter (SAARB) in a nano-Fe3O4 enhanced ozonation process (nFe3O4-O3) were investigated in batch experiments. A continuous experiment then confirmed the effectiveness of the process for SAARB effluent treatment. In a batch experiment, the effects of influencing factors, including nFe3O4 dosage, O3 dosage and initial pH on the treatment performance of nFe3O4-O3 process, were comprehensively investigated. The results showed that when the nFe3O4 dosage = 6 g L−1, O3 dosage = 0.15 L minute−1 and initial pH = 7, the total organic carbon, absorbance at 254 nm and colour number removal efficiencies were 40.58%, 62.55% and 89.80%, respectively. In addition, most of the humic- and fulvic-like substances in the SAARB effluent were removed, and the condensation degree, aromaticity and humification degree of the organics were substantially reduced. The morphology and elemental valence state analysis showed that the nFe3O4 in the process was relatively stable and could form an nFe3O4-organic complex. Therefore, the probability of organics reacting with hydroxyl radical increased and the oxidation efficiency was enhanced. In the continuous experiment, both the O3 dosage and hydraulic retention time (HRT) were the key influencing factors. The treatment efficiency of the nFe3O4-O3 process was enhanced at a higher O3 dosage and longer HRT. The electrical energy consumption of the continuous nFe3O3-O3 process was calculated to be 17.72 kW h m−3 in SAARB effluent treatment. This study proved the feasibility of biologically treated landfill leachate treatment by the nFe3O3-O3 process.

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“…177 The landll leachate with a complex nature contains a wide range of recalcitrant, very hazardous, stable, and toxic compounds that untreated landll leachate using appropriate methods can enter to surface water, groundwater and soil. 99,[178][179][180] In an experiment conducted by a Li et al 181 the persistent compounds degradation of the landll leachate was performed using the BEF system with a two-chamber MFC equipped with CF anode electrode and a graphite cathode electrode with natural pyrrhotite coating. The maximum power density of 4.2 W m À3 was produced using a pyrrhotite cathode electrode more than a graphite cathode electrode.…”

Section: Real Wastewatersmentioning

confidence: 99%

A review on bio-electro-Fenton systems as environmentally friendly methods for degradation of environmental organic pollutants in wastewater

2022

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Degradation of recalcitrant organics in landfill concentrated leachate by a microwave-activated peroxydisulfate process

Abstract: A microwave-activated peroxydisulfate process was used to the pre-treatment for recalcitrant organics in concentrated leachate.

Cited by 42 publications

References 55 publications

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Degradation of refractory organic matter in the effluent from a semi-aerobic aged refuse biofilter-treated landfill leachate by a nano-Fe₃O₄ enhanced ozonation process

A review on bio-electro-Fenton systems as environmentally friendly methods for degradation of environmental organic pollutants in wastewater

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Degradation of recalcitrant organics in landfill concentrated leachate by a microwave-activated peroxydisulfate process

Abstract: A microwave-activated peroxydisulfate process was used to the pre-treatment for recalcitrant organics in concentrated leachate.

Cited by 42 publications

References 55 publications

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Degradation of refractory organic matter in the effluent from a semi-aerobic aged refuse biofilter-treated landfill leachate by a nano-Fe3O4 enhanced ozonation process

A review on bio-electro-Fenton systems as environmentally friendly methods for degradation of environmental organic pollutants in wastewater

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Degradation of refractory organic matter in the effluent from a semi-aerobic aged refuse biofilter-treated landfill leachate by a nano-Fe₃O₄ enhanced ozonation process