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Purpose <p>Food waste management is a critical global concern with significant environmental implications. This study employs Life Cycle Assessment (LCA) to evaluate the environmental impacts of two food waste disposal pathways in the United Kingdom (UK): (1) collection of separated food waste at the kerbside and (2) the use of kitchen food waste disposers (FWDs) discharging to wastewater collection and treatment systems.</p> Methods <p>Using the ReCiPe (2016) method and SimaPro software, impacts across 18 midpoint indicators were assessed for a functional unit of treating 100&#xa0;kg of food waste, including anaerobic digestion (AD) in both pathways, with biomethane credited via substitution of fossil natural gas. Sensitivity analyses were conducted for variations in waste transportation distances and emissions factors of electricity grids across different UK regions.</p> Results <p>The results revealed that kerbside collection performed worse across 14 of 18 midpoint impact indicators. FWDs contributed to higher global warming potential of 30&#xa0;kg CO<sub>2</sub> eq versus 17&#xa0;kg CO<sub>2</sub> eq for kerbside collection, mainly due to greenhouse gas emissions during sewer network transport and wastewater treatment. However, they avoid the transport burdens that dominate key kerbside impacts (e.g. particulate matter and a large share of global warming potential), offering reduced transport emissions and greater convenience in high-density living scenarios.</p> Conclusion <p>These findings highlight the nuanced trade-offs in food waste management and the potential role of FWDs in a comprehensive waste reduction policy in the UK. These findings are not only relevant for UK policy but have implications for cities worldwide facing logistical challenges in separate food waste collection, especially in high-density urban areas.</p>

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Food waste management: evaluating the environmental impacts of kerbside collection and food waste disposers

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月27日

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  • Mustafa Ali,
  • Ilina Atanasovska,
  • Andrew Nichols,
  • Vanessa Speight,
  • Lenny Koh

摘要

Purpose

Food waste management is a critical global concern with significant environmental implications. This study employs Life Cycle Assessment (LCA) to evaluate the environmental impacts of two food waste disposal pathways in the United Kingdom (UK): (1) collection of separated food waste at the kerbside and (2) the use of kitchen food waste disposers (FWDs) discharging to wastewater collection and treatment systems.

Methods

Using the ReCiPe (2016) method and SimaPro software, impacts across 18 midpoint indicators were assessed for a functional unit of treating 100 kg of food waste, including anaerobic digestion (AD) in both pathways, with biomethane credited via substitution of fossil natural gas. Sensitivity analyses were conducted for variations in waste transportation distances and emissions factors of electricity grids across different UK regions.

Results

The results revealed that kerbside collection performed worse across 14 of 18 midpoint impact indicators. FWDs contributed to higher global warming potential of 30 kg CO2 eq versus 17 kg CO2 eq for kerbside collection, mainly due to greenhouse gas emissions during sewer network transport and wastewater treatment. However, they avoid the transport burdens that dominate key kerbside impacts (e.g. particulate matter and a large share of global warming potential), offering reduced transport emissions and greater convenience in high-density living scenarios.

Conclusion

These findings highlight the nuanced trade-offs in food waste management and the potential role of FWDs in a comprehensive waste reduction policy in the UK. These findings are not only relevant for UK policy but have implications for cities worldwide facing logistical challenges in separate food waste collection, especially in high-density urban areas.