Rapid digestion of shredded MSW by sequentially flooding and draining small landfill cells

Clarke, William P.; Xie, Sihuang; Patel, Miheka

doi:10.1016/j.wasman.2015.11.050

Cited by 21 publications

(14 citation statements)

References 14 publications

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“…The BMP and COD values are slightly lower than that reported in other studies for Brisbane waste where BMPs of 231 and 245 ml CH 4 /gVS were reported (Nopharatana, 2001;Radnidge, 2009) and more recently by Clarke et al (2015) who determined the BMP on the undersized fraction (<8cm)…”

Section: Characterizations Of Municipal Solid Wastecontrasting

confidence: 58%

Aerobic degradation processes in active landfill cells

Rafiee¹

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II | P a g e ABSTRACTA landfill is built up in cells with each cell filled in layers. Layers are covered with soil, typically 200 to 300mm thick as a temporary measure to maintain sanitary conditions. A thicker cover, typical 500mm, would be placed over a completed cell. Previous researchers have measured O 2 concentrations at shallow depth beneath soil covers as well as high concentrations of CO 2 relative to CH 4 from the surface of soil layers.Despite evidence of the ingress of O 2 through soil covers, the extent that the uppermost waste beneath soil covers is degraded aerobically has not been quantified. A major challenge in the quantification of aerobic processes in beds of soil covered waste is that CH 4 oxidation, composting and anaerobic digestion could occur simultaneously in different zones close to the surface of the bed.The objectives of this study were: To develop and verify a mass balance model for a waste bed exposed to atmosphere at the upper surface to determine the rate of CH 4 oxidation (r ox ), composting (r com ) and anaerobic digestion (r AD ) based on surface fluxes of gas components and concentrations of the same components at the base of the bed; and  To apply and validate the model on packed beds of fresh waste with a surface exposed to atmosphere in order to determine the contribution of aerobic processes to waste degradation. The mass balance model that was developed is a steady state mass balance of the gaseous components CH 4 , CO 2 , O 2 and the stable isotope III | P a g e  Reactor 1 was fed with CH 4 at the base of bed. Reactor 2 was flushed with 2-Bromoethanesulfonate to partially suppress CH 4 generation and therefore CH 4 oxidation. Reactor 3 contained a bed covered by a 10-15cm layer of soil to limit O 2 intrusion. Reactor 4 was the control reactor, containing the same amount of waste and operated in the same manner as the other reactors.The consumption rate of O 2 and the production rates of CH 4 and CO 2 were measured on-line while the production of 13 C-CO 2 was measured by manual sampling and analysing at 10-15 day intervals.The mass balance model was used to estimate r at each 13 C-CO 2 sampling event over the course of experiment (26 weeks). The result of this experiment showed that anaerobic digestion, CH 4 oxidation and composting occurred simultaneously in both the covered and uncovered beds.The emitted biogas in the uncovered beds implied that they were fully aerobic. The results of mass balance model, however, revealed that both r AD and r OX were significant and based on an integration of r AD , 49% of the beds COD was degraded anaerobically. The generated CH 4 was subsequently oxidized leading to a minimal CH 4 emissions from the uncovered beds. Similarly, approximately 35% of the total emitted C from the soil covered bed was CH 4 , superficially implying this was the only bed supporting anaerobic activity. However, the mass balance model showed r AD was only marginally enhanced by the presence of soil layer with 68% of the solids (COD basis) degradedanaero...

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Section: Characterizations Of Municipal Solid Wastecontrasting

confidence: 58%

Aerobic degradation processes in active landfill cells

Rafiee¹

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“…Details of landfill bioreactors design and the flood and drain operation are presented in Clarke et al [18]. Operation for bioreactors is briefly summarised here.…”

Section: Landfill Bioreactorsmentioning

confidence: 99%

“…Analytical methods for measuring pH, soluble chemical oxygen demand (sCOD), volatile fatty acids (VFAs), and total ammonium-N are described in Clarke et al [18].…”

Section: Leachate Analysismentioning

confidence: 99%

“…1) are described in Clarke et al [18]. Briefly, the increase from an initial Although the sCOD removal efficiency was ~93%, the stabilised leachate still contained a high residual sCOD content (~5.6 g/l).…”

Section: Change In Leachate Ph Cod Vfa and Nh 4 -N Contentmentioning

confidence: 99%

“…Clarke et al [18] first demonstrated a flood and drain regime for degrading MSW large-scale using two in-ground bioreactors containing 1026t and 915t of shredded MSW (<8cm). The bioreactors, labelled for the purposes of this paper as LR1 and LR2, were flooded and drained repeatedly, to achieve an average methane yield of The flood and drain process intensified the biodegradation process, reflected by (1) high volatile fatty acids concentrations, (2) high methane production rates, and (3) shorter duration for stabilization of MSW.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fluctuation of dissolved heavy metal concentrations in the leachate from anaerobic digestion of municipal solid waste in commercial scale landfill bioreactors: The effect of pH and associated mechanisms

Xie

Strong

et al. 2015

Journal of Hazardous Materials

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Enhancing biomethanation performance through co-digestion of diverse organic wastes: a comprehensive study on substrate optimization, inoculum selection, and microbial community analysis

Choudhury,

Singh,

Lalwani

et al. 2024

Environ Sci Pollut Res

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A blend of organic municipal solid waste, slaughterhouse waste, faecal sludge, and land ll leachate opted as substrates in different mix ratios to formulate a pertinent mixture for biomethanation. Individual substrates were characterized and the mix ratio was optimized with the help of the response surface methodology tool to a value of 1:1:1:1 (against a C/N ratio of 28 ± 0.769 and VFA of 2500 ± 10.53) to improve the overall performance. The optimized blend (C/N ratio: 28.6, volatile fatty acids: 2538 mg/L) was characterized for physicochemical, biological, and microbial properties and subjected to anaerobic digestion in lab-scale reactors of 1000 ml capacity with and without the addition of inoculum. The gas yield of individual substrates and blends was ascertained separately. The observed cumulative gas yield over 21 days from the non-inoculated substrates varied between 133 to 2035 ml. While the addition of external inoculation at a 5% rate (w/w) against the substrate, uplifted the minimum and maximum cumulative gas yield values to 203 ml and 3394 ml. The inoculum procured from the Defence Research and Development Organisation (DRDO) was screened beforehand considering factors such as maximizing VFA production and consumption rate, gas yield, and quality of digestate. A similar outcome related to gas yield and digestate quality was observed for the equivalent blend. The cumulative gas yield value increased from 2627 ml to 4284 ml over 21 days post-application of a similar dosage of DRDO inoculum. Analysis of the 16S rRNA gene revealed that the predominant bacterial population belonged to the Firmicutes phylum, with the majority falling within the orders Clostridiales and Lactobacillales. Ultimately, the study advocates the potential of the aforementioned blend for anaerobic co-digestion to enhance the gas yield and digestate quality.

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Rapid digestion of shredded MSW by sequentially flooding and draining small landfill cells

Cited by 21 publications

References 14 publications

Aerobic degradation processes in active landfill cells

Aerobic degradation processes in active landfill cells

Fluctuation of dissolved heavy metal concentrations in the leachate from anaerobic digestion of municipal solid waste in commercial scale landfill bioreactors: The effect of pH and associated mechanisms

Enhancing biomethanation performance through co-digestion of diverse organic wastes: a comprehensive study on substrate optimization, inoculum selection, and microbial community analysis

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