Waste to energy bio-digester selection and design model for the organic fraction of municipal solid waste

A. Njuguna Matheri, C. Mbohwa, F. Ntuli, M. Belaid, T. Seodigeng, J. Catherine Ngila, C. Kinuthia Njenga

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In this study, a feasibility study was carried out in terms of quantification-characterization of waste, biomethane potential from organic biomass and bio-digester selection and designing. From waste quantification, 38% was found to be an organic fraction of the municipal solid waste (OFMSW) of the 1.4 million tonnes per year. The composition of the waste was investigated using a laboratory batch anaerobic digester for biochemical methane potential (BMP) and the waste to energy bio-digester selection and design for the anaerobic co-digestion of different OFMSW originating from the City of Johannesburg landfills. The carbon to nitrogen (C/N) ratio of OFMSW was found to be below 13. Through co-digestion, the C/N ratio settled at 15. Laboratory experimental data from 500 ml batch anaerobic digester operating at a mesophilic temperature of 37 °C and pH of 6.9 had a good productivity of methane of average 59% recommended in the literature and was used to derive the volume of digester and surface area. The artificial intelligence (AI) technique was applied to select the most preferred digester model. Using the application of the simple multi-attribute rating (SMART) technique of multiple-criteria decision analysis (MCDA) as a decision support tool, the most preferred option of a bio-digester model was selected from a list of potential alternatives available in the market. The continuous stirred tank reactor (CSTR) scored highest with 79% and was selected as the most preferred digester for the OFMSW digestion. The geometry of the biodigester parameters was found to be comparable and economically feasible with the process parameters, energy generation from the BMP and scale up model for the independent power producer (IPP). © 2017 Elsevier Ltd
Original languageEnglish
Pages (from-to)1113-1121
Number of pages9
JournalRenewable and Sustainable Energy Reviews
Volume82
DOIs
Publication statusPublished - 2018

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Municipal solid waste
Methane
Nitrogen
Carbon
Decision theory
Land fill
Artificial intelligence
Biomass
Productivity
Geometry
Chemical analysis
Temperature

Cite this

Njuguna Matheri, A. ; Mbohwa, C. ; Ntuli, F. ; Belaid, M. ; Seodigeng, T. ; Catherine Ngila, J. ; Kinuthia Njenga, C. / Waste to energy bio-digester selection and design model for the organic fraction of municipal solid waste. In: Renewable and Sustainable Energy Reviews. 2018 ; Vol. 82. pp. 1113-1121.
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Njuguna Matheri, A, Mbohwa, C, Ntuli, F, Belaid, M, Seodigeng, T, Catherine Ngila, J & Kinuthia Njenga, C 2018, 'Waste to energy bio-digester selection and design model for the organic fraction of municipal solid waste', Renewable and Sustainable Energy Reviews, vol. 82, pp. 1113-1121. https://doi.org/10.1016/j.rser.2017.09.051

Waste to energy bio-digester selection and design model for the organic fraction of municipal solid waste. / Njuguna Matheri, A.; Mbohwa, C.; Ntuli, F.; Belaid, M.; Seodigeng, T.; Catherine Ngila, J.; Kinuthia Njenga, C.

In: Renewable and Sustainable Energy Reviews, Vol. 82, 2018, p. 1113-1121.

Research output: Contribution to journalArticle

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T1 - Waste to energy bio-digester selection and design model for the organic fraction of municipal solid waste

AU - Njuguna Matheri, A.

AU - Mbohwa, C.

AU - Ntuli, F.

AU - Belaid, M.

AU - Seodigeng, T.

AU - Catherine Ngila, J.

AU - Kinuthia Njenga, C.

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AB - In this study, a feasibility study was carried out in terms of quantification-characterization of waste, biomethane potential from organic biomass and bio-digester selection and designing. From waste quantification, 38% was found to be an organic fraction of the municipal solid waste (OFMSW) of the 1.4 million tonnes per year. The composition of the waste was investigated using a laboratory batch anaerobic digester for biochemical methane potential (BMP) and the waste to energy bio-digester selection and design for the anaerobic co-digestion of different OFMSW originating from the City of Johannesburg landfills. The carbon to nitrogen (C/N) ratio of OFMSW was found to be below 13. Through co-digestion, the C/N ratio settled at 15. Laboratory experimental data from 500 ml batch anaerobic digester operating at a mesophilic temperature of 37 °C and pH of 6.9 had a good productivity of methane of average 59% recommended in the literature and was used to derive the volume of digester and surface area. The artificial intelligence (AI) technique was applied to select the most preferred digester model. Using the application of the simple multi-attribute rating (SMART) technique of multiple-criteria decision analysis (MCDA) as a decision support tool, the most preferred option of a bio-digester model was selected from a list of potential alternatives available in the market. The continuous stirred tank reactor (CSTR) scored highest with 79% and was selected as the most preferred digester for the OFMSW digestion. The geometry of the biodigester parameters was found to be comparable and economically feasible with the process parameters, energy generation from the BMP and scale up model for the independent power producer (IPP). © 2017 Elsevier Ltd

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DO - 10.1016/j.rser.2017.09.051

M3 - Article

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JO - Renewable and Sustainable Energy Reviews

JF - Renewable and Sustainable Energy Reviews

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