Determination of the least impactful municipal solid waste management option in Harare, Zimbabwe
- Nhubu, Trust, Muzenda, Edison
- Authors: Nhubu, Trust , Muzenda, Edison
- Date: 2019
- Subjects: Municipal solid waste management , Life cycle assessment , Life cycle impacts
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/404136 , uj:33879 , Citation: Nhubu, T. & Muzenda, E. 2019. Determination of the least impactful municipal solid waste management option in Harare, Zimbabwe. Processes 2019, 7, 785; doi:10.3390/pr7110785
- Description: Abstract: Six municipal solid waste management (MSWM) options (A1–A6) in Harare were developed and analyzed for their global warming, acidification, eutrophication and human health impact potentials using life cycle assessment methodology to determine the least impactful option in Harare. Study findings will aid the development of future MSWM systems in Harare. A1 and A2 considered the landfilling and incineration, respectively, of indiscriminately collected MSW with energy recovery and byproduct treatment. Source-separated biodegradables were anaerobically treated with the remaining non-biodegradable fraction being incinerated in A3 and landfilled in A4. A5 and A6 had the same processes as in A3 and A4, respectively, except the inclusion of the recovery of 20% of the recoverable materials. The life cycle stages considered were collection and transportation, materials recovery, anaerobic digestion, landfilling and incineration. A5 emerged as the best option. Materials recovery contributed to impact potential reductions across the four impact categories. Sensitivity analysis revealed that doubling materials recovery and increasing it to 28% under A5 resulted in zero eutrophication and acidification, respectively. Increasing material recovery to 24% and 26% under A6 leads to zero acidification and eutrophication, respectively. Zero global warming and human health impacts under A6 are realised at 6% and 9% materials recovery levels, respectively.
- Full Text:
- Authors: Nhubu, Trust , Muzenda, Edison
- Date: 2019
- Subjects: Municipal solid waste management , Life cycle assessment , Life cycle impacts
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/404136 , uj:33879 , Citation: Nhubu, T. & Muzenda, E. 2019. Determination of the least impactful municipal solid waste management option in Harare, Zimbabwe. Processes 2019, 7, 785; doi:10.3390/pr7110785
- Description: Abstract: Six municipal solid waste management (MSWM) options (A1–A6) in Harare were developed and analyzed for their global warming, acidification, eutrophication and human health impact potentials using life cycle assessment methodology to determine the least impactful option in Harare. Study findings will aid the development of future MSWM systems in Harare. A1 and A2 considered the landfilling and incineration, respectively, of indiscriminately collected MSW with energy recovery and byproduct treatment. Source-separated biodegradables were anaerobically treated with the remaining non-biodegradable fraction being incinerated in A3 and landfilled in A4. A5 and A6 had the same processes as in A3 and A4, respectively, except the inclusion of the recovery of 20% of the recoverable materials. The life cycle stages considered were collection and transportation, materials recovery, anaerobic digestion, landfilling and incineration. A5 emerged as the best option. Materials recovery contributed to impact potential reductions across the four impact categories. Sensitivity analysis revealed that doubling materials recovery and increasing it to 28% under A5 resulted in zero eutrophication and acidification, respectively. Increasing material recovery to 24% and 26% under A6 leads to zero acidification and eutrophication, respectively. Zero global warming and human health impacts under A6 are realised at 6% and 9% materials recovery levels, respectively.
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Sizing of an anaerobic biodigester for the organic fraction of municipal solid waste
- Kigozi, R., Aboyade, A. O., Muzenda, Edison
- Authors: Kigozi, R. , Aboyade, A. O. , Muzenda, Edison
- Date: 2014
- Subjects: Anaerobic digestion , Biogas digesters , Clean energy , Municipal solid waste management
- Type: Article
- Identifier: uj:4982 , ISSN 2078-0966 , http://hdl.handle.net/10210/13114
- Description: The anaerobic digestion (AD) of the organic fraction of municipal solid waste (OFMSW) for biogas production is a potential solution to the growing challenges associated with municipal solid waste (MSW) management while simultaneously providing an alternative clean energy source. Biogas is produced by the anaerobic digestion (AD) of biomass using microorganisms in specifically designed plants called biogas digesters under controlled conditions or naturally in marshes and landfills. It is a rather clean and versatile fuel as opposed to fossil fuels. To design an efficient AD system, a proper understanding of the quality and quantity of available feedstock must be made as well as prevailing operating conditions. This paper represents steps that were taken to come up with an optimal size of biodigester to treat OFMSW produced at the University of Johannesburg’s Doornfontein Campus in downtown Johannesburg. The campus generates 232.2kg of OFMSW per day which required 30m3 of biodigester capacity.
- Full Text:
- Authors: Kigozi, R. , Aboyade, A. O. , Muzenda, Edison
- Date: 2014
- Subjects: Anaerobic digestion , Biogas digesters , Clean energy , Municipal solid waste management
- Type: Article
- Identifier: uj:4982 , ISSN 2078-0966 , http://hdl.handle.net/10210/13114
- Description: The anaerobic digestion (AD) of the organic fraction of municipal solid waste (OFMSW) for biogas production is a potential solution to the growing challenges associated with municipal solid waste (MSW) management while simultaneously providing an alternative clean energy source. Biogas is produced by the anaerobic digestion (AD) of biomass using microorganisms in specifically designed plants called biogas digesters under controlled conditions or naturally in marshes and landfills. It is a rather clean and versatile fuel as opposed to fossil fuels. To design an efficient AD system, a proper understanding of the quality and quantity of available feedstock must be made as well as prevailing operating conditions. This paper represents steps that were taken to come up with an optimal size of biodigester to treat OFMSW produced at the University of Johannesburg’s Doornfontein Campus in downtown Johannesburg. The campus generates 232.2kg of OFMSW per day which required 30m3 of biodigester capacity.
- Full Text:
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