A review of the characteristics of Fenton and ozonation systems in landfill leachate treatment

Wu, Chuanwei; Chen, Weiming; Gu, Zhepei; Li, Qibin

doi:10.1016/j.scitotenv.2020.143131

Cited by 133 publications

(50 citation statements)

References 159 publications

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“…Consequently, mature LL cannot efficiently be treated by biological processes; thus, alternative technologies must be considered for its successful depuration. Advanced oxidation processes (AOPs) are the most popular methods that have been addressed to degrade bio-recalcitrant matter because they are able to enhance the biodegradability of LL [7][8][9][10][11][12][13][14]. One of the most common AOPs used for this purpose is the Fenton reaction [15][16][17], which consists in the generation of hydroxyl radicals, which hold great oxidative power, to degrade organic matter through the reaction between hydrogen peroxide and Fe 2+ , as it is shown in Equation ( 1): 3+ (1)…”

Section: Introductionmentioning

confidence: 99%

UVA-LED Technology’s Treatment Efficiency and Cost in a Competitive Trial Applied to the Photo-Fenton Treatment of Landfill Leachate

et al. 2021

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The objective of this trial was to assess the application of UVA-LED technology as an alternative source of irradiation for photo-Fenton processes, aiming to reduce treatment costs and provide a feasible treatment for landfill leachate. An optimized combination of coagulation with ferric chloride followed by photo-Fenton treatment of landfill leachate was optimized. Three different radiation sources were tested, namely, two conventional high-pressure mercury-vapor immersion lamps (100 W and 450 W) and a custom-designed 8 W 365 nm UVA-LED lamp. The proposed treatment combination resulted in very efficient degradation of landfill leachate (COD removal = 90%). The coagulation pre-treatment removed about 70% of the COD and provided the necessary amount of iron for the subsequent photo-Fenton treatment, and it further favored this process by acidifying the solution to an optimum initial pH of 2.8. The 90% removal of color improved the penetration of radiation into the medium and by extension improved treatment efficiency. The faster the Fenton reactions were, as determined by the stoichiometric optimum set-up reaction condition of [H2O2]0/COD0 = 2.125, the better were the treatment results in terms of COD removal and biodegradability enhancement because the chances to scavenge oxidant agents were limited. The 100 W lamp was the least efficient one in terms of final effluent quality and operational cost figures. UVA-LED technology, assessed as the application of an 8 W 365 nm lamp, provided competitive results in terms of COD removal, biodegradability enhancement, and operational costs (35–55%) when compared to the performance of the 450 W conventional lamp.

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Section: Introductionmentioning

confidence: 99%

UVA-LED Technology’s Treatment Efficiency and Cost in a Competitive Trial Applied to the Photo-Fenton Treatment of Landfill Leachate

et al. 2021

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“…One of the most significant environmental problems associated with this type of facility corresponds to the liquid waste generated during its operation and closure [5,6]. Leachate has become one of the main challenges of liquid waste treatment engineering, due to its high polluting loads (e.g., organic matter and heavy metals), and therefore it stands out as one of the areas of greatest interest during landfill management [7,8]. In Latin America, it is often reported that the technologies implemented for the leachate transport and treatment do not meet the technical conditions for controlling environmental pollution and public health concerns [9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Landfill Leachate Treatment System Using Arima Models: A Case Study in a Megacity

2021

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Leachate has been reported as the most significant source of landfill pollution. Predicting the characteristics of untreated and treated leachate may be useful during optimal scheduling of leachate treatment systems. The objective of this paper is to show an analysis of the operation of a landfill leachate treatment system in a Latin American megacity (Bogota, Colombia) by means of auto-regressive integrated moving average (ARIMA) models. A comparative analysis of the leachate treated with respect to reference legislation is carried out. The influence of climate variables during the operation of the treatment system is also considered. The results suggest that the concentrations of heavy metals (HMs), BOD5, and COD in untreated leachate do not follow the same annual cycles observed for the quantity of solid waste disposed within the landfill. This difference is possibly associated with the hydraulic retention time (HRT) of the leachate inside the conduction and pre-treatment system (storage/homogenization ponds). The ARIMA analysis suggests an HRT of up to one month (AR = 1) for the HMs identified as indicators of untreated leachate (Cu, Pb, and Zn). It is noted that the removal efficiency of HM indicators of the operation of the leachate treatment plant (Fe and Ni) is probably conditioned by operations carried out over a period of one month (AR = 1). The high input concentration of these HM indicators may prevent changing their ARIMA temporal structure during leachate treatment. This is reflected in the low removal efficiencies for all HMs under study (average = 26.1%).

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“…The authors [3] [4] and [5] have considered that the phases in the decomposition of MSW in sanitary landfills are related to the age of the leachates. The author [6] made a classification of leachates based on their characteristics of pH, COD, TOC, BOD 5 and volatile fatty acids (VFA) and its age, in young (less than 5 years), medium (5 to 10 years) and old or stabilized (older than 10 years). The authors [6] and [7], studied and obtained leachate results, where the organic content was dependent on the class of decomposition conditions, the acetic acid and volatile fatty acids produced in the leachate in his study showed high values of COD and BOD 5 .…”

Section: Introductionmentioning

confidence: 99%

“…The author [6] made a classification of leachates based on their characteristics of pH, COD, TOC, BOD 5 and volatile fatty acids (VFA) and its age, in young (less than 5 years), medium (5 to 10 years) and old or stabilized (older than 10 years). The authors [6] and [7], studied and obtained leachate results, where the organic content was dependent on the class of decomposition conditions, the acetic acid and volatile fatty acids produced in the leachate in his study showed high values of COD and BOD 5 . In the next degradation stage, these acids were converted to CO 2 and CH 4 , so the organic content of the leachate decreased notably.…”

Section: Introductionmentioning

confidence: 99%

Treatment Processes of Leachate from a Landfill by Advanced Oxidation Fenton and Ozone-UV

Sebastián¹,

Eduardo²,

Sergio³

et al. 2021

JEP

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In this paper it is presented the results of advanced oxidation of leachates from a technified sanitary landfill located in the State of Querétaro, Mexico. One characteristic of already stabilized leachates from sanitary landfills like this case, is their difficult degradation, mainly because the organic matter contained is recalcitrant. For the samples collect, four sites were selected, where three points per site were sampled, measuring at each site the parameters: temperature, pH, conductivity, redox potential (ORP) and dissolved oxygen (DO) and leachate samples were collected. On the other hand, the Chemical Oxygen Demand (COD) of crude leachates, leachates acidified and leachates oxidized by Fenton reagent and Ozone-UV combined were analyzed. COD was used to monitor the degradation kinetics. With the results, the ArcGIS software was applied to study the distribution of temperature, dissolved oxygen and COD mainly in the leachate lagoon. For the application of Fenton reagent in the crude leachate oxidation, the pH was first adjusted and Fe 2+ /H 2 O 2 ratio was optimized. The efficiency of Ozone-UV treatments was studied through COD degradation kinetics. The graphs of in (Ci/Co) vs time, showed that the kinetic processes are of order one, with very acceptable regression coefficients (R 2 ) and extraordinarily similar speed constants (K). With Fenton oxidation, the highest percentage of COD degradation was achieved and with Ozone-UV oxidation, it was possible to practically degrade all the COD.

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A review of the characteristics of Fenton and ozonation systems in landfill leachate treatment

Cited by 133 publications

References 159 publications

UVA-LED Technology’s Treatment Efficiency and Cost in a Competitive Trial Applied to the Photo-Fenton Treatment of Landfill Leachate

UVA-LED Technology’s Treatment Efficiency and Cost in a Competitive Trial Applied to the Photo-Fenton Treatment of Landfill Leachate

Analysis of the Landfill Leachate Treatment System Using Arima Models: A Case Study in a Megacity

Treatment Processes of Leachate from a Landfill by Advanced Oxidation Fenton and Ozone-UV

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