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A review of plastic waste management practices: What can South Africa learn?

Assessment of the municipal solid waste transfer stations suitability in Harare, Zimbabwe

Comparative assessment of integrated municipal solid waste management options for Harare

  • Authors: Nhubu, Trust
  • Date: 2019
  • Subjects: Integrated solid waste management - Zimbabwe - Harare
  • Language: English
  • Type: Doctoral (Thesis)
  • Identifier: http://hdl.handle.net/10210/417880 , uj:35408
  • Description: Ph.D. (Chemical Engineering) , Abstract: Harare, the capital city of Zimbabwe and its surrounding urban centres of Chitungwiza, Epworth, Ruwa and Norton are experiencing enormous municipal solid waste management (MSWM) challenges. This study compared the environmental impacts of six developed MSWM options (A1- A6) that could be considered for future implementation in Harare city and its surrounding urban areas to partly contribute to addressing the prevailing MSWM challenges. The MSWM practises currently being practised and their associated impacts together with global developments in MSWM were reviewed and informed the development of the six MSWM options. The MSWM options were assessed for their associated global warming, human health, acidification and eutrophication impact potentials using the Life Cycle Assessment (LCA) methodology to determine the least impactful option or scenario. An analysis of the impact potential contributions of individual MSWM processes or treatment technologies that constituted the six MSWM options was carried out. Further, a comparative assessment of composting and anaerobic digestion (AD) of biodegradable MSW was undertaken. Opportunities and limitations for MSW source separation, suitability of MSW transfer stations, options for decentralised MSWM and barriers to possible implementation of least impactful MSWM option were reviewed. Review findings of the sustainability of MSWM practices currently being practiced and their impacts show that both groundwater and surface water pollution are manifesting from poor MSWM practices negatively impacting freshwater availability resulting in the outbreak of water borne diseases. Six MSWM options or scenarios (A1–A6) for possible implementation in Harare and its surrounding urban areas were developed. MSWM options A1 and A2 considered the landfilling and incineration, respectively, of indiscriminately collected MSW with energy recovery and by product treatment. Source-separated...
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Determination of the least impactful municipal solid waste management option in Harare, Zimbabwe

  • 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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Framework for decentralising municipal solid waste management in Harare, Zimbabwe

Integrated and consolidated review of plastic waste management and bio-based biodegradable plastics : challenges and opportunities

Modeling a Sustainable, Self-Energized Pine Dust Pyrolysis System With Staged Condensation for Optimal Recovery of Bio-Oil

Special Issue: Comparative assessment 1 of compositing and anaerobic digestion of 2 municipal biodegradable waste in Harare, Zimbabwe

  • Authors: Nhubu, Trust , Muzenda, Edson , Mbohwa, Charles , Agbenyeku, Emmanuel O M
  • Date: 2019
  • Subjects: Life Cycle Assessment , Sustainable , Compost
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/405304 , uj:34029 , Citation:
  • Description: Abstract : Composting and AD of biodegradable waste were assessed for their benefits from literature and environmental impacts using the life cycle impact assessment procedure. Literature review findings indicate an overall edge for AD over composting largely due to its renewable energy production capabilities, reduced exhaust emissions and cost effectiveness considering the entire MSW life cycle. LCIA results show that both AD and composting leads to increases across the four impact categories considered namely, global warming, human health, eutrophication and acidification. AD however showed lower contributions than composting to global warming, human health and acidification. Composting only showed lower contribution than AD in regards to eutrophication. Overall study results indicate an edge for AD over composting in treating and managing biodegradable fraction of MSW generated in Harare and its surrounding urban and peri urban environments of Chitungwiza, Epworth, Norton and Ruwa.
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Sustainability context analysis of municipal solid waste management in Harare, Zimbabwe

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