Evaluation of the biodegradability and toxicity of landfill leachates after pretreatment using advanced oxidative processes

Costa, Fábio Moraes da; Daflon, Sarah Dario Alves; Bila, Daniele Maia; Fonseca, Fabiana Valéria da; Campos, Juacyara Carbonelli

doi:10.1016/j.wasman.2018.02.030

Cited by 91 publications

(25 citation statements)

References 25 publications

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“…Due to the high BOD 5 /COD ratio, it can be assumed that effective removal of organic and nitrogen compounds will be possible [34,37,38]. Also, other studies suggest that advanced oxidation usage increases biodegradability [14,17]. Coagulation with FeCl 3 at pH 6.0, coupled with the Fe 0 /H 2 O 2 process, proved to have similar efficiency to other processes tested in the available literature, including electrochemical [11,20,36] and advanced oxidation [15][16][17]19,21,25] treatments.…”

Section: Fe 0 /H 2 O 2 Processmentioning

confidence: 71%

“…The worldwide wastewater discharge regulations and standards have become stricter; hence, there is an urgent need to find an effective LL treatment method. 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]…”

Section: Introductionmentioning

confidence: 99%

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

Bogacki

Marcinowski

El-Khozondar

2019

Water

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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.

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Section: Fe 0 /H 2 O 2 Processmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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

Bogacki

Marcinowski

El-Khozondar

2019

Water

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“…Numerous studies have confirmed that the landfill leachate is a reservoir of elevated concentrations of contaminants of emerging concern (CECs), such as phenolic compounds, polycyclic aromatic hydrocarbons, pharmaceuticals, heavy metals, chloride, cyanides, sulfur compounds, humic acids, and ammonia nitrogen, which should be eliminated for the mitigation of leachate toxicity before its discharge into the environment. The landfill leachate composition often varies temporally and spatially, which makes it extremely and (5) establishing the relationships between the factors being studied and evaluating the efficiency of bioaugmentation strategy.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Bioaugmentation Potential of Pseudomonas putida OR45a and Pseudomonas putida KB3 in the Sequencing Batch Reactors Fed with the Phenolic Landfill Leachate

Michalska

Piński

Żur

et al. 2020

Water

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The treatment of landfill leachate could be challenging for the biological wastewater treatment systems due to its high toxicity and the presence of poorly biodegradable contaminants. In this study, the bioaugmentation technology was successfully applied in sequencing batch reactors (SBRs) fed with the phenolic landfill leachate by inoculation of the activated sludge (AS) with two phenol-degrading Pseudomonas putida OR45a and Pseudomonas putida KB3 strains. According to the results, the SBRs bioaugmented with Pseudomonas strains withstood the increasing concentrations of the leachate. This resulted in the higher removal efficiency of the chemical oxygen demand (COD) of 79–86%, ammonia nitrogen of 87–88% and phenolic compounds of 85–96% as compared to 45%, 64%, and 50% for the noninoculated SBR. Simultaneously, the bioaugmentation of the AS allowed to maintain the high enzymatic activity of dehydrogenases, nonspecific esterases, and catalase in this ecosystem, which contributed to the higher functional capacity of indigenous microorganisms than in the noninoculated AS. Herein, the stress level experienced by the microorganisms in the SBRs fed with the leachate computed based on the cellular ATP measurements showed that the abundance of exogenous Pseudomonas strains in the bioreactors contributed to the reduction in effluent toxicity, which was reflected by a decrease in the stress biomass index to 32–45% as compared to the nonbioaugmented AS (76%).

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“…Based on landfill ages, the degradation of organic waste goes through the successive: aerobic, acidogenic (anaerobic), methanogenic, and stabilization stages, and depending on the degradation phases, leachates generated are classified into three types, such as young , intermediate, and stabilized . Thereby, their characteristics and purification processes are different (Da Costa, Daflon, Bila, Fonseca, & Campos, ; Fernandes, Pacheco, Ciríaco, & Lopes, ).…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, to treat intermediate (between 5–10 years) and mature leachates (more than 10 years), which contain more refractory compounds with a complex structure consisting mainly of humic and fulvic acids (Kamaruddin, Yusoff, Aziz, & Hung, ). Conventional treatment is not very effective because they are usually not sufficient in degrading high molecular weight fractions and merely transfer pollutants to another phase that needs to be treated (Da Costa et al, ). Hence, advanced oxidation processes (AOPs) stand out as an alternative solution for the removal of refractory organic matter from leachates, making them suitable to combine with a downstream biological process (Gomes, Santos, Silva, Boaventura, & Vilar, ; Mohajeri, Hamidi, Isa, & Zahed, ).…”

Section: Introductionmentioning

confidence: 99%

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Rouidi

Maurício

Boukhrissa

et al. 2019

Water Environment Research

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The feasibility of the electro-Fenton (EF) process to improve the biodegradability of Algerian leachates was examined, in order to prepare this kind of flux for conventional biological treatment. This work also included, for the first time in Algeria, the control and monitorization of a landfill-the "Hamici" landfill. Several physicochemical parameters were determined allowing its classification into an intermediate degradation phase, namely considering their alkaline pH (8.7), high ammonium concentration (3,120 mg/L), low content in heavy metals, and biodegradability (BOD 5 / COD = 0.22). The effects of important parameters such as current intensity, treatment time, and temperature on COD removal have been studied and optimized by using response surface analysis of a central composite design, where 91.1% of COD was removed with a treatment time of 285 min, a current intensity of 3 A, and a temperature of 20°C. A biodegradability test, which was performed on a solution electrolyzed with 120 min, 2 A, and 20°C, allowed to improve the leachates biodegradability from 0.2 to 0.42, with a removal rate of COD and TOC of 53.35% and 34.5%, respectively. However, the current efficiency declined from 137% to 76.6% when the current intensity was rise from 0.5 to 2 A. These results showed the relevance of EF process applied on raw intermediate leachates and its possible benefit in the Algiers leachates treatment processes. Thus, it was concluded that biological treatment can be combined with EF process for optimal mineralization of leachates with clear advantages in this studied location. • Practitioner points• Characterization and treatment of leachates by electro-Fenton (EF) process were carried out. • The leachates are intermediate type and therefore biologically recalcitrant. • The operating parameter for EF process were modeled and optimized by the central composite design. • Current intensity of 2 A reduces COD and TOC of 53.35% and 34.5%, respectively. • The ratio BOD 5 /COD increased from 0.2 to 0.42 after 120 min of electrolysis time.

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Evaluation of the biodegradability and toxicity of landfill leachates after pretreatment using advanced oxidative processes

Cited by 91 publications

References 25 publications

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

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

Analysis of the Bioaugmentation Potential of Pseudomonas putida OR45a and Pseudomonas putida KB3 in the Sequencing Batch Reactors Fed with the Phenolic Landfill Leachate

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

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