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Alkalay, David; Guerrero, Lorna; Lema, Juan M.; Méndez, R.; Chamy, Rolando

doi:10.1023/a:1008876107787

Cited by 52 publications

(5 citation statements)

References 40 publications

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“…The chemical composition of leachates from lysimeter study was within the range of reported values for landfill leachate. Although leachate composition was very widely depending on moisture content, age of landfill, nature of the wastes, and the events that preceded the time of sampling (Alkalay et al 1998;Paksy et al 1998), laboratory lysimeters provided an effective model system for study of the reactions that might impact clogging of leachate collection systems. In addition to the differences in the amount of moisture available for waste degradation and landfill age, different temperature ranges are associated with a biologically active landfill in comparison with the laboratory environment.…”

Section: Resultsmentioning

confidence: 99%

“…Modern municipal waste landfills have started to operate in Lithuania since 2007. Earlier practice was to dump the municipal waste in landfills, which were not equipped with leachate and gas collection systems, and therefore leachate and gas find their way into the surrounding environment (Alkalay et al 1998;Zigmontienė, Zuokaitė 2010;Petraitis 2009;Jaskelevičius, Lynikienė 2009).…”

Section: Introductionmentioning

confidence: 99%

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Clogging Test of Landfill Leachate Drainage Using Different Fillers / Skirtingų Užpildų Tinkamumo, Siekiant Išvengti Filtrato Drenažo Užsikimšimo, Tyrimas

Bazienė

Vasarevičius

Siddiqui

2012

Journal of Environmental Engineering and Landscape Management

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Municipal waste landfill leachate formed at different stages of the operation of the landfill, has a negative impact on the natural environment. According to the newly implemented waste management policy on modern solid waste deposit sites, landfill leachate has to be monitored. Five experimental columns were constructed in size of 500 mm long and 200 mm in diameter. They were filled with different fillers. The flow of leachate allowed for calculation of the leachate volume per year in a landfill, where it was taken. The experiment was carried out for 365 days. Significant change of the porosity was determined in all columns. Although the landfill for this period represents only 1/50 or less of the operation time, the laboratory tests found that the drainage layer bandwidth of reduction in one year can have a negative impact in the long run of time, which will only increase congestion. For higher porosity value of the test substance, allowing for more impairment, a 2% points decrease in the value is less dangerous when the porosity value is of 57 or 45 percent, than of 29 or 47%. The main elements that influence the conductivity decrease are calcium, silicon and iron compounds. The change of these compounds was observed during lysimetric study, where the concentration of each month in all the columns was decreasing. The results showed, that the rubber used for creating fillers in columns provided for bigger porosity of the layer. It is the beneficial reason to use rubble and rubber waste mix for forming drainage layer in landfills. Santrauka Komunalinių atliekų sąvartynų filtratas, susiformuojantis skirtingais sąvartyno eksploatacijos etapais, daro neigiamą įtaką gamtinei aplinkai. Naujai įgyvendinama atliekų tvarkymo strategija. Šiuolaikinėse kietųjų atliekų deponavimo aikštelėse atliekama sąvartynų filtrato stebėsena. Eksperimentui atlikti sumontuotos 500 mm ilgio ir 200 mm skersmens kolonėlės buvo pripildytos skirtingų užpildų. Filtratas leistas apskaičiavus metinį sąvartyno filtro kiekį. Eksperimentas buvo atliekamas 365 dienas. Reikšmingi poringumo pokyčiai nustatyti visuose tirti naudotuose mišiniuose. Sąvartyno eksploatavimo atžvilgiu toks laikotarpis tėra 1/50 dalis ar dar mažiau eksploatavimo trukmės. Laboratoriniais tyrimais nustačius, kad drenažo sluoksnio pralaidumo sumažėjimas per vienerius metus gali turėti neigiamos įtakos, yra akivaizdu – per ilgą eksploatavimo laiką užsikimšimas tik didės. Kai tiriamos medžiagos poringumo vertė didesnė, leistinas didesnis jos sumažėjimas, t. y. poringumo vertei esant 57 ir 45%, jos sumažėjimas 2% punktais yra mažiau pavojingas nei esant 29 ar 47%. Pagrindiniai elementai, darantys įtaką laidumo sumažėjimui, yra kalcio, silicio bei geležies junginiai. Šių junginių koncentracijų pokytis buvo stebimas lizimetrinio tyrimo metu. Koncentracijos kiekvieną mėnesį visose kolonėlėse mažėjo. Rezultatai rodė, kad sąvartynų filtrato drenažiniam sluoksniui tinkamiausia naudoti drenažo skaldos ir gumos atliekų mišinį. Jo poringumas mažiausiai pakito.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clogging Test of Landfill Leachate Drainage Using Different Fillers / Skirtingų Užpildų Tinkamumo, Siekiant Išvengti Filtrato Drenažo Užsikimšimo, Tyrimas

Bazienė

Vasarevičius

Siddiqui

2012

Journal of Environmental Engineering and Landscape Management

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“…These disadvantages do not apply to anaerobic process, as this process does not require oxygen for aeration. 90 Nitrification-denitrification. Nitrification is one of the most economical ways to remove NH 3 -N from landfill leachate.…”

Section: Individual Treatmentmentioning

confidence: 99%

Biological processes for treatment of landfill leachate

et al. 2010

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This review presents an overview with critical analysis of the technical applicability of biological treatments for landfill leachate. A particular focus is given to activated sludge (AS), sequencing batch reactors (SBR), aerated lagoons (AL), and upflow anaerobic sludge blankets (UASB). Their advantages and limitations in application are evaluated. Selected information is presented such as pH, hydraulic retention time (HRT), organic loading rate (OLR), characteristics of leachate and treatment performance. It is evident from the literature survey of 188 papers (1976-2010) that none of the individual biological treatments presented is universally applicable for removing recalcitrant contaminants from leachate. Among the biological treatments reviewed, AS, SBR and UASB are the most frequently applied. These treatments are effective not only to remove over 90% of COD with a concentration ranging from 3500-26 000 mg L(-1), but also to achieve 80% of NH(3)-N removal with a concentration ranging from 100-1000 mg L(-1). A combination of physico-chemical and biological treatment into an integrated process is effective for leachate treatment. Almost complete removal of COD and NH(3)-N was reported for combined reverse osmosis (RO) and UASB with an initial COD concentration of 35 000 mg L(-1) and NH(3)-N concentration of 1600 mg L(-1). Integrated Fenton's oxidation and AS could achieve about 98% and 99% of COD and NH(3)-N removal, respectively, with initial COD and NH(3)-N concentrations of 7000 mg L(-1) and 1800 mg L(-1). Overall, the selection of the most suitable treatment for leachate depends on its characteristics, technical applicability and potential constraints, effluent limit required, cost-effectiveness, regulatory requirements and long-term environmental impacts.

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“…It is essential to protect soil, surface and groundwater contamination due to leachates percolation in and around the dumpsite [15]. This becomes imperative as the heavy metals present in the dumpsite might be injurious to the health of people that consumes the water from boreholes and wells around as well as crops grown on such soils.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Heavy Metals Presence in Selected Dumpsites within Igboora, Oyo State, Nigeria

Olla,

Bello,

Ogunjinmi

et al. 2024

ASRJ

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This study was carried out to evaluate the level of Cd, Pb, and Cr in some selected dumpsites within Igboora, Ibarapa Central Local Government of Oyo State. Soil samples were collected from Abattoir, Oja Igboora, Oja Oba, New Abattoir and Towobowo dumpsites. The control samples were collected at 20m away from each of the dumpsites. The samples were collected at two different sampling depths- 0-20cm and 20-40cm. The samples were replicated three times. All the data collected were analyzed using Genstat Statistical Package and means separated using Least Significant Difference (LSD). The results obtained revealed that the highest amount of Pb, Cd, Cr (232.99 mg kg-1, 28.53 mg kg-1 and 53.67 mg kg-1), respectively were recorded at Abattoir dumpsite. The quantity of lead in the selected dumpsites increased with the sampling depth. However, Cd and Cr values reduced with the sampling depth. All the values observed were significant at 5% level of probability. The value of Pb and Cd, recorded in all the dumpsites including the control sites were above the maximum limit recommended by WHO. Attention should therefore be paid to the presence of heavy metals in this area as crops grown in soils around these dumpsites could accumulate the metals and eventually get to food chain when such crops are consumed. Similarly, the fact that they were detected both at the upper layer and sub-soil means they could contaminate the ground water around this area.

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Untitled

Cited by 52 publications

References 40 publications

Clogging Test of Landfill Leachate Drainage Using Different Fillers / Skirtingų Užpildų Tinkamumo, Siekiant Išvengti Filtrato Drenažo Užsikimšimo, Tyrimas

Clogging Test of Landfill Leachate Drainage Using Different Fillers / Skirtingų Užpildų Tinkamumo, Siekiant Išvengti Filtrato Drenažo Užsikimšimo, Tyrimas

Biological processes for treatment of landfill leachate

Assessment of Heavy Metals Presence in Selected Dumpsites within Igboora, Oyo State, Nigeria

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