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Life cycle assessment of solar home system informal waste management practices in Malawi

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  • Kinally, Christopher
  • Antonanzas-Torres, Fernando
  • Podd, Frank
  • Gallego-Schmid, Alejandro

Abstract

This study performs the first life cycle assessment of solar home systems (SHSs) to use data quantifying lead pollution from informal lead-acid battery recycling. The typical life cycle of SHSs in off-grid communities surrounding Malawi's capital of Lilongwe is assessed, considering affordable components imported from China, lead-acid battery lifetimes of one year, the collection of materials through the informal scrap market, the open dumping and burning of waste, and informal lead-acid battery recycling (remanufacturing). Lead-acid batteries are highlighted as the most damaging SHS component, occupying 54–99% of each impact category, caused by the burdens of lead mining and the high assembly energy of batteries, amplified by short battery lifetimes – subject to detrimental user practices. The amount of electricity delivered to users is significantly restricted by the low efficiency of affordable SHS components. Meanwhile, the informal remanufacturing of a single lead-acid battery is recorded to release over 100 times the lethal oral dose of lead for an adult into densely populated communities, resulting in a terrestrial ecotoxicity potential of 200–386 kg 1,4-DCB eq. per kWh delivered. Proposed formal recycling solutions are found to successfully mitigate the toxicity of informal waste management but incur significant burdens: substituting toxic but resource-efficient informal remanufacture with safe but energy-intensive formal battery production. Furthermore, the short one-year lifetimes of lead-acid batteries can cause the environmental impacts of SHS to exceed the impacts of diesel generators in most impact categories, resulting in a global warming potential of up to 1.4 kg CO2/kWh. Hence, both extended battery lifetimes of three years and formal recycling are found to be necessary for SHSs to be considered as a safe and low-carbon technology – requiring holistic interventions.

Suggested Citation

  • Kinally, Christopher & Antonanzas-Torres, Fernando & Podd, Frank & Gallego-Schmid, Alejandro, 2024. "Life cycle assessment of solar home system informal waste management practices in Malawi," Applied Energy, Elsevier, vol. 364(C).
    • Handle: RePEc:eee:appene:v:364:y:2024:i:c:s0306261924005737
    DOI: 10.1016/j.apenergy.2024.123190
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    References listed on IDEAS

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