Mechanistic investigations in ultrasonic pretreatment and anaerobic digestion of landfill leachates

Nazimudheen, Gazliya; Roy, Kuldeep; Sivasankar, Thirugnanasambandam; Moholkar, Vijayanand S.

doi:10.1016/j.jece.2018.02.001

Cited by 25 publications

(8 citation statements)

References 31 publications

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“…Pretreatment could also be considered in order to enhance leachate biodegradability. Ultrasonication, for example, was shown to increase soluble COD fractions and modify leachate composition in terms of NH 3 -N and acetate concentrations (Nazimudheen et al 2018 ). High ammonia levels may stripped by air and calcium hydroxide, removing up to 70% of leachate’s ammonia content (Cheung et al 1997 ).…”

Section: Discussionmentioning

confidence: 99%

“…“Emerging” technologies may also be appropriate (Wiszniowski et al 2006 ). These include chemical oxidation (Kim and Huh 2009 ); adsorption (Foo and Hameed 2009 ); ammonia removal by biodegradation (Capodaglio et al 2016b ) or stripping (Cheung et al 1997 ); evaporation, filtration, and reverse osmosis (Di Palma et al 2002 ); sonication (Nazimudheen et al 2018 ); Advanced Oxidation Processes (Capodaglio 2018 , 2019 ) and others (Capodaglio 2017 ), depending on leachate composition, and discharge or site-specific constraints. Significant treatment efficiency improvement and decrease of overall treatment costs could be pursued by process combinations, to improve biodegradation of refractory organics (Koh et al 2004 ; Geenens et al 2001 ; Cecconet et al 2017 ).…”

Section: Introductionmentioning

confidence: 99%

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Bioelectrochemical treatment of municipal solid waste landfill mature leachate and dairy wastewater as co-substrates

Bolognesi

Cecconet

Callegari

et al. 2020

Environ Sci Pollut Res

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Despite solid wastes’ landfill disposal limitation due to recent European legislation, landfill leachate disposal remains a significant problem and will be for many years in the future, since its production may persist for years after a site’s closure. Among process technologies proposed for its treatment, microbial fuel cells (MFCs) can be effective, achieving both contaminant removal and simultaneous energy recovery. Start-up and operation of two dual-chamber MFCs with different electrodes’ structure, fed with mature municipal solid waste landfill leachate, are reported in this study. Influent (a mix of dairy wastewater and mature landfill leachate at varying proportions) was fed to the anodic chambers of the units, under different conditions. The maximum COD removal efficiency achieved was 84.9% at low leachate/dairy mix, and 66.3% with 7.6% coulombic efficiency (CE) at a leachate/dairy ratio of 20%. Operational issues and effects of cells’ architecture and electrode materials on systems’ performance are analyzed and discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bioelectrochemical treatment of municipal solid waste landfill mature leachate and dairy wastewater as co-substrates

Bolognesi

Cecconet

Callegari

et al. 2020

Environ Sci Pollut Res

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“…Sonication has several possible advantages in leachate pretreatment to facilitate anaerobic digestion, such as the degradation of large organic molecules into short organics that microbial cells can easily uptake, thus resulting in enhanced biogas generation. Furthermore, the hydrolysis of the leachate produces haloacetic acid and trihalomethanes, both of which could be used as disinfectants [85]. Ultrasonication's main advantages are simple, quicker degradation kinetics, better ambient conditions for bulk reaction mixture, lower hazardous by-product formation, and strong compatibility and synergism with traditional treatment procedures [86].…”

Section: Ultrasonic Pretreatment-admentioning

confidence: 99%

A Recent Progress in the Leachate Pretreatment Methods Coupled with Anaerobic Digestion for Enhanced Biogas Production: Feasibility, Trends, and Techno-Economic Evaluation

Anjum

Anees

Qadeer

et al. 2023

IJMS

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Landfill leachate (LFL) treatment is a severe challenge due to its highly viscous nature and various complex pollutants. Leachate comprises various toxic pollutants, including inorganic macro/nano components, xenobiotics, dissolved organic matter, heavy metals, and microorganisms responsible for severe environmental pollution. Various treatment procedures are available to achieve better effluent quality levels; however, most of these treatments are nondestructive, so pollutants are merely transported from one phase to another, resulting in secondary contamination. Anaerobic digestion is a promising bioconversion technology for treating leachate while producing renewable, cleaner energy. Because of its high toxicity and low biodegradability, biological approaches necessitate employing other techniques to complement and support the primary process. In this regard, pretreatment technologies have recently attracted researchers’ interest in addressing leachate treatment concerns through anaerobic digestion. This review summarizes various LFL pretreatment methods, such as electrochemical, ultrasonic, alkaline, coagulation, nanofiltration, air stripping, adsorption, and photocatalysis, before the anaerobic digestion of leachate. The pretreatment could assist in converting biogas (carbon dioxide to methane) and residual volatile fatty acids to valuable chemicals and fuels and even straight to power generation. However, the selection of pretreatment is a vital step. The techno-economic analysis also suggested the high economic feasibility of integrated-anaerobic digestion. Therefore, with the incorporation of pretreatment and anaerobic digestion, the process could have high economic viability attributed to bioenergy production and cost savings through sustainable leachate management options.

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“…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%

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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Mechanistic investigations in ultrasonic pretreatment and anaerobic digestion of landfill leachates

Cited by 25 publications

References 31 publications

Bioelectrochemical treatment of municipal solid waste landfill mature leachate and dairy wastewater as co-substrates

Bioelectrochemical treatment of municipal solid waste landfill mature leachate and dairy wastewater as co-substrates

A Recent Progress in the Leachate Pretreatment Methods Coupled with Anaerobic Digestion for Enhanced Biogas Production: Feasibility, Trends, and Techno-Economic Evaluation

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

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