Suitability of microwave and microwave-coupled systems for landfill leachate treatment: An overview

Tripathy, Binay Kumar; Kumar, Mathava

doi:10.1016/j.jece.2017.11.039

Cited by 39 publications

(16 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Difficulties with its treatment derive from high concentrations of toxic pollutants (e.g., ammonia, heavy metals), refractory compounds as well as seasonal variation in the composition, and amount of leachate [5,6]. In spite of this, there are several known methods of leachate treatment that incorporate various physical, chemical, and biological processes [7]. Leachate treatment methods can be grouped based on the nature of the incorporated processes, as conventional and advanced treatments, as done by [5].…”

Section: Introductionmentioning

confidence: 99%

“…However, technologies based on advanced oxidation processes (AOPs) as well as membrane technologies as well are regarded as potential alternatives for leachate treatment (advanced treatments) [5,8]. Leachate composition and properties, mainly physicochemical characteristics and age (see Table 1), are the basis for the appropriate selection of the method of treatment [5,7,9]. A high ratio of 5-day biochemical oxygen demand to chemical oxygen demand (BOD 5 /COD ratio) characterizing the young leachate makes it susceptible to effective treatment via biological methods, which are otherwise ineffective, especially when the aforementioned ratio is below 0.1, which is typical for mature or stabilized landfill leachates [10,11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrasound-Assisted Treatment of Landfill Leachate in a Sequencing Batch Reactor

Grosser

Neczaj

Madeła

et al. 2019

Water

View full text Add to dashboard Cite

Purification of leachates is currently a big challenge due to their high variability in composition and amount. The complexity of the medium, namely leachates, makes new solutions highly sought after and finds the existing ones in need of optimization. The effects of ultrasound pretreatment (20 kHz, 12 µm) on biological treatment of landfill leachates in the form of processes carried out in two sequencing batch reactors were investigated. The experiment was divided into two stages. In the first stage, leachate was treated by an ultrasonic field at different sonication times (0.5, 1, 3, 5, 10 and 15 min). Next, leachates with and without conditioning were combined with municipal wastewater in the following ratios: 5, 10, 15 and 25% v/v. For optimal processing time (3 min), 16% removal of COD was achieved. In turn, the BOD5/COD ratio was 0.3, which is higher by approximately 270% than that of the non-conditioned sample. Further elongation of sonication time did not significantly affect both parameters. Also, pretreatment of leachate resulted in a maximum increase noted in the study of specific oxygen uptake rate and dehydrogenase activity of approximately 21 and 2 times compared to the non-conditioned sample. The implementation of a pretreatment step prior to the biological treatment was shown to result in higher pollutant removal efficiency. Depending on the share of leachates in the mixture, the removal enhancements of BOD, COD, and ammonium nitrogen for conditioned samples ranged from 6–48.5%, 4–48% and 11–42%, respectively. Furthermore, pretreatment of leachate allows for an increased (by up to 20%) share of leachate volume in the influent stream entering the reactor, while maintaining the quality of effluents in accordance with national regulation requirements. However, in scenarios without pretreatment, the leachate ratio cannot exceed 5% of the total wastewater due to poor quality of the effluents. The operational cost of ultrasound pretreatment of leachate was 22.58 €/(m3·g removed COD).

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasound-Assisted Treatment of Landfill Leachate in a Sequencing Batch Reactor

Grosser

Neczaj

Madeła

et al. 2019

Water

View full text Add to dashboard Cite

show abstract

“…Many researchers are investigating new and effective methods for LL treatment, such as sorption on magnetic particles [2] and other sorbents [8], reactive granular filters [9], the use of metallic iron [4,10,11] and other heterogeneous catalysts [12,13], Fenton (classical and solar) [14][15][16][17], electro-Fenton [18,19], and other electrochemical processes [11,[20][21][22][23][24], usage of different oxidants and their combination [25,26], microwaves [10], ultrasounds [27], membrane processes [28], hydrodynamic cavitation [29], microalgae [30], biofiltration [21,31], supercritical water oxidation [32], oscillating biological membrane photoreactors [33], anaerobic digestion [27,34], dynamic membrane bioreactors [35], bio-electro-Fenton [36], upflow sludge bed reactors [37], moving bed biofilm reactors [38], and the sequencing batch reactor [39]. Moreover, a few review articles have summarized the LL treatment methods [40][41][42][43][44]…”

Section: Introductionmentioning

confidence: 99%

Treatment of Landfill Leachates with Combined Acidification/Coagulation and the Fe0/H2O2 Process

Bogacki

Marcinowski

El-Khozondar

2019

Water

View full text Add to dashboard Cite

One of the major environmental concerns associated with waste disposal is the large amount of generated landfill leachates (LL), which are considered a type of wastewater with a complex composition. There is an urgent need to find an effective LL treatment method. LL were subjected to pretreatment followed by the Fe0/H2O2 process. Pretreatment efficiency was coagulation at pH 6.0 >> coagulation at pH 9.0 > acidification at pH 3.0. Coagulation at pH 6.0 in an optimal Fe3+ dose of 1000 mg/L decreased total organic carbon (TOC) from the initial concentration of 1061 mg/L to 491 mg/L while acidification to pH 3.0 decreased TOC to 824 mg/L. After acidification, the Fe0/H2O2 process with 8000/9200 mg/L Fe0/H2O2 reagent doses decreased TOC to 499 mg/L after a processing time of 60 min. Performance of the Fe0/H2O2 process after coagulation at pH 6.0 for optimal Fe0/H2O2 8000/5540 mg/L reagent doses decreased TOC to 268 mg/L (75% TOC removal). Treatment of landfill leachates with combined process coagulation and Fe0/H2O2 also increased their susceptibility to biodegradation, expressed as the biochemical oxygen demand/chemical oxygen demand (BOD5/COD) ratio from 0.13 to 0.43, allowing LL to be considered as susceptible to biodegradation. Fe0/H2O2 process kinetics was described. A statistical analysis confirmed the obtained results. The proposed method can be successfully applied for LL treatment.

show abstract

“…Despite that, there are several known methods of leachate treatment, which incorporate various physical, chemical, and biological processes [5]. Based on the nature of the incorporated processes methods of leachate treatment can be grouped as conventional and advanced treatments, as done by Renou et al [4].…”

Section: Introductionmentioning

confidence: 99%

“…Selection of the appropriate leachate treatment method is based on its composition and properties (mainly physicochemical characteristics as well as its age) [4][5][6]. Young leachate due to high BOD5/COD ratio can be effectively treated using biological methods [7].…”

Section: Introductionmentioning

confidence: 99%

Treatment of Landfill Leachate Using Ultrasound Assisted SBR Reactor

et al. 2018

View full text Add to dashboard Cite

Abstract:The article investigated the effects of ultrasound pretreatment on biological treatment of landfill leachate. Leachates with and without conditioning were combined with municipal wastewater at different ratios. The study showed that the implementation of a pretreatment step prior to biological treatment not only results in higher pollutant removal efficiency but may also allow for an increased leachate volume share in the influent stream entering the reactor by up to 20% (quality of effluents meets national regulation requirements) which in scenarios without pretreatment cannot exceed 5% due to poor quality of the effluents.

show abstract

Suitability of microwave and microwave-coupled systems for landfill leachate treatment: An overview

Cited by 39 publications

References 96 publications

Ultrasound-Assisted Treatment of Landfill Leachate in a Sequencing Batch Reactor

Ultrasound-Assisted Treatment of Landfill Leachate in a Sequencing Batch Reactor

Treatment of Landfill Leachates with Combined Acidification/Coagulation and the Fe0/H2O2 Process

Treatment of Landfill Leachate Using Ultrasound Assisted SBR Reactor

Contact Info

Product

Resources

About