Municipal solid waste decomposition under oversaturated condition in comparison with leachate recirculation

Hao, Yong-jun; Wu, Weixiang; Wu, Songwei; Sun, Hongzhi; Chen, Yingxu

doi:10.1016/j.procbio.2007.10.004

Cited by 25 publications

(12 citation statements)

References 20 publications

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“…All this considered the experimental approach proposed in this study can be considered a solution for the start‐up of effective (semi)continuous anaerobic digestion processes entirely fed with a low digestible substrate, such as MS‐OFMSW. Since effective AD processes fed with MS‐OFMSW in the absence of co‐substrates were reported only under batch conditions,7–14 the present work represents an encouraging contribution to increasing the processing of the target waste in anaerobic digesters. As a consequence of the proposed approach, the microflora occurring in the bioreactor acquired a remarkable ability to convert MS‐OFMSW COD into biomethane throughout the 149 days of semicontinuous treatment.…”

Section: Discussionmentioning

confidence: 84%

“…The development of effective AD processes able to biomethanize wet MS‐OFMSW would contribute to promote the separation of wet and dry fractions of MSW: this approach can significantly increase the waste treatment effectiveness, since the disposal of dried matter would allow higher combustion efficiencies or lower waste amounts to be dumped if incineration or landfilling, respectively, are applied as the treatment procedure. However, most studies were related to co‐digestion processes, in which MS‐OFMSW was fed to the digester together with remarkable amounts of highly digestible co‐substrates,4–6 whereas few successful examples of direct AD of MS‐OFMSW have been reported in the literature 7–14. Furthermore, all these studies were carried out under batch conditions, often in the presence of recirculated leachate, with, to the very best of our knowledge, a lack of data related to effective AD (semi)continuous processes dedicated to the direct digestion of MS‐OFMSW occurs.…”

Section: Introductionmentioning

confidence: 99%

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Acclimation of an anaerobic consortium capable of effective biomethanization of mechanically‐sorted organic fraction of municipal solid waste through a semi‐continuous enrichment procedure

Bertin

Bettini

Zanaroli

et al. 2012

J of Chemical Tech & Biotech

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BACKGROUND: Municipal solid waste is generally disposed of by incineration or landfilling. Higher combustion efficiencies or lower waste amounts to be dumped, respectively, can be obtained through recovery of the waste wet fraction, which could be valorized by means of anaerobic digestion processes with the production of a CH4‐rich biogas. However, such a fraction is typically poorly digestible. The aim of this work was to obtain a methanogenic consortium capable of effective biomethanization of the wet fraction collected from a municipal solid waste. RESULTS: An up‐flow recirculated column bioreactor (0.36 L) was initially filled with cattle manure and then, after a short batch working period, fed with the above mentioned target substrate according to a semicontinuous scheme. More than 90% of the overall COD fed during the whole 5‐months experiment was depleted. The methane production yield gradually increased throughout the process to 0.35 L g−1 of depleted COD. Molecular analysis of the microbial consortium indicated that the archaeal population, which consisted of two acetoclastic Methanosarcina sp. strains, persisted during the whole experiment, whereas several hydrolytic and acidogenic Firmicutes and Bacteroidetes were enriched throughout the process, concomitantly to the increase of the biomethanization potential of the consortium. CONCLUSIONS: An anaerobic consortium capable of efficiently converting the wet fraction of municipal solid waste into methane was obtained through a dedicated enrichment procedure in an up‐flow anaerobic recirculated reactor. This result was mainly ascribed to the acclimation and enrichment of bacterial species. Copyright © 2012 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Acclimation of an anaerobic consortium capable of effective biomethanization of mechanically‐sorted organic fraction of municipal solid waste through a semi‐continuous enrichment procedure

Bertin

Bettini

Zanaroli

et al. 2012

J of Chemical Tech & Biotech

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“…The results are expected from a typical Sub-Saharan African country in which poverty, unemployment and massive immigration into urban centres prevail. Environmental hazards arising from the decomposition of solid waste under oversaturated conditions (Hao et al, 2008) and dumping of solid waste in illegal landfills often causes sludge Mertoglu et al, 2006). Such problems are particularly evident in suburbs of Tshwane such as Mamelodi and Marabastad.…”

Section: Discussionmentioning

confidence: 99%

Differential Factors of Efficiency in the Management of Solid Waste in the City of Tshwane, South Africa

Worku

Muchie

2013

African Journal of Science, Technology, Innovation and Developm

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The objective was to investigate factors that affect the efficient management of solid waste produced by commercial businesses operating in the City of Pretoria, South Africa. Data were gathered from 1,034 businesses. Efficiency in solid waste management was assessed using a structural time-based model designed for evaluating efficiency as a function of the length of time required to manage waste. Data analysis was performed using statistical procedures such as frequency tables, Pearson's chi-squared tests of association and binary logistic regression analysis. Odds ratios estimated from logistic regression analysis were used to identify key factors that affect efficiency in the proper disposal of waste. The study showed that 857 of the 1,034 businesses selected for the study (83%) were found to be efficient enough with regards to the proper collection and disposal of solid waste. Based on odds ratios estimated from binary logistic regression analysis, efficiency in the proper management of solid waste was significantly influenced by 4 predictor variables. These 4 influential predictor variables are: lack of adherence to waste management regulations, wrong perception, failure to provide customers with enough trash cans, and operation of businesses by employed managers, in decreasing order of importance.

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“…Besides a moisture flow through a biomass bed, the biomass moisture content itself is an important factor in anaerobic degradation (Pommier et al 2007;Hao et al, 2008). According to results from experiment 1, digestion of biomass with its water content adjusted to water holding capacity may proceed quite similarly both with and without leachate recirculation.…”

Section: 'Insert Figure 7'mentioning

confidence: 99%

Effect of various leachate recirculation strategies on batch anaerobic digestion of solid substrates

Kusch

Oechsner

Jungbluth

2012

IJEWM

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Various leachate recirculation strategies were applied to a batchwise operated one-stage solid-phase digestion system in laboratory-scale tests. Comparative experiments with both continuous and intermittent leachate recirculation revealed no advantages of a continuous flow. Results suggest that leachate recirculation should not be carried out continuously during process initialisation when methanogenesis is the rate-limiting step. Continuous watering resulted in the accumulation of Volatile Fatty Acids (VFA) during process start-up. In addition, no need for continuous water circulation was found for the following digestion process when hydrolysis was rate-limiting. Even in the absence of liquid recirculation, degradation was only slightly retarded when the biomass moisture content was adjusted.

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Municipal solid waste decomposition under oversaturated condition in comparison with leachate recirculation

Cited by 25 publications

References 20 publications

Acclimation of an anaerobic consortium capable of effective biomethanization of mechanically‐sorted organic fraction of municipal solid waste through a semi‐continuous enrichment procedure

Acclimation of an anaerobic consortium capable of effective biomethanization of mechanically‐sorted organic fraction of municipal solid waste through a semi‐continuous enrichment procedure

Differential Factors of Efficiency in the Management of Solid Waste in the City of Tshwane, South Africa

Effect of various leachate recirculation strategies on batch anaerobic digestion of solid substrates

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