Ozonation and perozonation on the biodegradability improvement of a landfill leachate

Amaral‐Silva, Nuno; Martins, Rui C.; Castro‐Silva, Sérgio; Quinta‐Ferreira, Rosa M.

doi:10.1016/j.jece.2015.12.002

Cited by 58 publications

(18 citation statements)

References 23 publications

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“…The biological degradation of solid waste in landfills with pluvial water infiltration generates wastewater called landfill leachate . The composition of leachate is highly variable and depends on several factors such as the constitution of buried waste and its bio‐decomposition stage, as well as climatic factors .…”

Section: Introductionmentioning

confidence: 99%

“…The biological degradation of solid waste in landfills with pluvial water infiltration generates wastewater called landfill leachate. [1] The composition of leachate is highly variable and depends on several factors such as the constitution of buried waste and its bio-decomposition stage, as well as climatic factors. [2][3][4] The most common pollutants found at the highest concentrations are colour, biodegradable organic matter, inorganic matter (ions and several metals), recalcitrant compounds (such as humic substances), and toxic and mutagenic compounds (ammonia and xenobiotic organic matter: pesticides, phenols, aromatic hydrocarbons, and halogenated organic compounds).…”

mentioning

confidence: 99%

“…[24][25][26][27] Therefore, leachate treatment is essential prior to its disposal into the environment. Physicochemical processes, [28][29][30][31][32] biological processes, [33,34] advanced oxidation processes, [1,35,36] supercritical oxidation processes, [37][38][39][40] and wet oxidation processes [12] have been studied to evaluate leachate degradation. Supercritical water oxidation (ScWO) has emerged as a technology that can potentially effectively degrade landfill leachates.…”

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Supercritical water oxidation treatment of humic acid as a model organic compound of landfill leachate

et al. 2020

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Landfill leachate is a complex and variable effluent, rich in organic and inorganic matters resistant to decomposition, and is an extreme pollutant. Humic acids (HA) are some of the most refractive substances in the leachates, which is the reason why they have been used as an organic model. The degradation of an HA solution through supercritical water oxidation (ScWO) was evaluated under a constant pressure of 22.5 MPa, temperatures from 400°C to 600°C, and reaction times from 15 to 60 seconds. The results showed that the most influential factor was temperature and it guided the operational conditions of the ScWO for the landfill leachate (22.5 MPa, 600°C, and 60 seconds). The landfill leachate treatment promoted high removal rates of true colour (87%), total dissolved solids (94%), nitrate (70%), and total phosphorus (96%). In addition, it removed 57% of the COD, which was similar to the HA removal rate (61%) under the same operational conditions. This indicates that HA are an adequate organic model for landfill leachates. The results suggest that ScWO is a clean and promising treatment technology that can be applied to landfills and can have even better results if used in combination with oxidizers and catalysts, or with the use of higher temperatures.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Supercritical water oxidation treatment of humic acid as a model organic compound of landfill leachate

et al. 2020

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“…Among the solutions for the treatment of landfill leachate, the ozone treatment was proposed by numerous authors. [7][8][9][10][11][12][13][14][15][16][17][18] Initially it was mainly proposed as the stabilizer of the leachate properties, 13 but later it was recognized the benefits of ozonation (or other oxidation processes) to facilitate the biological treatment. 8 The fact that landfill leachate is composed by refractory organic matter led the researchers to apply a series of advanced oxidation processes in its treatment.…”

Section: Introductionmentioning

confidence: 99%

“…13 With this approach the adsorption efficiency of the activated carbon is considerably enhanced thanks to the pre-ozonation of the leachate. 14 Furthermore, the leachate biodegradability is enhanced by the pre-ozonation and the perozonation 14 but also the reverse approach was studied with the biological digestion of the leachate, followed by ozonation. 16 The latest trends involve the use of catalytic ozonation of the leachate in the presence of suitable oxides.…”

Section: Introductionmentioning

confidence: 99%

Successful Landfill Leachate Wastewater Treatment Using the Sequence of Ozonation, Adsorption on Charcoal and Photo-Ozonolysis

Cataldo

2018

ECB

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Landfill leachate derived from the landfilling practice of the municipal wastes is a problem affecting all countries and continents. Even after the shutdown of a landfill site, the leachate production continues for decades. In this work a solution for the landfill lea chate treatment has been proposed based on three fundamental steps: the pre-ozonolysis of the leachate, the passage of the ozonized leachate through a fixed bed of activated carbon and the final step consisting in a photo-ozonolysis stage involving the simultaneous action of ozone and UV light. A distinction between the chemical structure and chemical behaviour of young and mature leachate was evidenced by thermal analysis of the soluble organic matter (SOM) obtained from these substrates. Furthermore, a distinction between young and mature leachate was also evidenced in terms of their different reactivity toward ozone as illustrated by the COD abatement and by FTIR spectroscopy on pristine and ozonized SOM. A modular pilot plant for the treatment of different landfill leachates was presented and proposed.

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Catalytic ozonation treatment of biochemically treated leachate from municipal waste solid using Ti–Mn oxide‐coated stainless steel mesh catalyst

Huang

Quan

Zhu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUNDLandfill leachate is a kind of complex organic wastewater, the discharge standard of which is difficult to meet after traditional biochemical treatment. In this work, a Ti–Mn stainless steel corrugated wire mesh (SSCWM) catalyst was prepared by the sol–gel method, which was used for the catalytic ozonation of biochemically treated leachate.RESULTSThe catalyst was characterized using scanning electron microscopy, energy dispersive X‐ray spectroscopy, X‐ray diffraction and X‐ray photoelectron spectroscopy techniques. The data showed that the chemical oxygen demand (COD) removal efficiency of the leachate by ozone alone, SSCWM/O3, Ti–SSCWM/O3 and Ti–Mn/SSCWM/O3 system reached 55.06%, 64.44%, 68.97% and 78.43%, respectively. The catalytic effect of different layers of Ti–Mn oxide‐coated SSCWM catalyst showed that two catalytic layers had the best activity of COD removal efficiency, reaching 87.17%, and the final COD reached the national emission standard (<100 mg L−1). At the same time, the results of fluorescence spectrum and gas chromatography–mass spectrometry (GC‐MS) analysis confirmed this point. The stability of the catalyst decreased with the increase in usage times, and the final COD removal efficiency was 73.91% after six cycles of use. To understand the reason for catalyst deactivation, the adsorbed organic matter on the catalyst surface was determined by GC‐MS analysis. In addition, COD removal of the catalyst can be increased to 80.55% after in situ regeneration of the mesh catalyst by a sequential cleaning process consisting of alkali–acid–hydrogen peroxide–ethanol–water.CONCLUSIONIn short, application of the mesh catalyst in catalytic ozonation can be considered as a promising method for wastewater treatment, because of avoidance of solid–liquid separation and easy regeneration of catalytic activity. © 2020 Society of Chemical Industry

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Ozonation and perozonation on the biodegradability improvement of a landfill leachate

Cited by 58 publications

References 23 publications

Supercritical water oxidation treatment of humic acid as a model organic compound of landfill leachate

Supercritical water oxidation treatment of humic acid as a model organic compound of landfill leachate

Successful Landfill Leachate Wastewater Treatment Using the Sequence of Ozonation, Adsorption on Charcoal and Photo-Ozonolysis

Catalytic ozonation treatment of biochemically treated leachate from municipal waste solid using Ti–Mn oxide‐coated stainless steel mesh catalyst

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