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Life cycle environmental and economic impact of a food waste recycling-farming system: a case study of organic vegetable farming in Japan

  • Sustainable Food Production and Consumption
  • Published:
The International Journal of Life Cycle Assessment Aims and scope Submit manuscript

Abstract

Purpose

Bio-based recycling systems and agricultural production using recycled materials are often evaluated separately. This study performs an environmental and socio-economic life cycle assessment (LCA) of a food waste treatment and spinach farming system in Japan. The environmental and economic tradeoffs of introducing a recycling system and the net environmental benefit of the substitution of market fertilizer considering operation changes are also examined.

Methods

Three scenarios were developed and compared. In the conventional (CV) scenario, food waste is collected, incinerated, and disposed of in landfill, and the farmer uses market organic fertilizer. The on-site composting (OC) scenario processes food waste using an on-site garbage disposer and transports compost to a nearby spinach farmer. Food waste in the centralized composting (CC) scenario is transported to a centralized composting facility and resultant compost is sent to the farm. Primary data were obtained from field experiments and interviews. Non-greenhouse gas (GHG) emissions from the field and nitrogen leaching to water systems were simulated using the denitrification–decomposition (DNDC) model.

The environmental LCA targeted climate change, eutrophication, and waste landfill. An input–output analysis estimated socio-economic indicators, namely gross added value and employment inducement effect.

Results and discussion

The scenario with the lowest impact is the CC scenario. Climate change and eutrophication impacts are highest in the OC scenario and waste landfill impacts are most significant in the CV scenario. The weighted impact by LIME2 can be reduced by 47% in the CC scenario and 17% in the OC scenario due to the recycling of food waste instead of dumping in the landfill. The difference in socio-economic indicators between the scenarios was relatively small, although the CV scenario encouraged more employment. The substitution effect of composting, as well as the environmental impact reduction of replacing market organic fertilizer with compost, will result in 28.7% of the avoided impacts in GHG emissions.

Conclusions

Both composting scenarios are feasible from an environmental and socio-economic perspective when compared with conventional organic production, although there is a tradeoff between waste landfill and GHG emissions for the on-site composting system. However, the OC scenario needs to save electricity to improve its environmental competitiveness with the CV scenario. When considering the substitution effect of composting, it is recommended to take into account that agricultural operation also changes.

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Funding

This research is partly supported by a research grant from The Yanmar Environmental Sustainability Support Association.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, College of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, 525-8577, Japan

    Naoki Yoshikawa

  2. Department of Civil and Environmental Engineering, Graduate School of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, 525-8577, Japan

    Tomoya Matsuda

  3. Hokkaido Electric Power Co., Inc, 2 Higashi 1-chome Odori, Chuo-ku, Sapporo, Hokkaido , 060-8677, Japan

    Tomoya Matsuda

  4. College of Gastronomy Management, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, 525-8577, Japan

    Koji Amano

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  1. Naoki Yoshikawa
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Correspondence to Naoki Yoshikawa.

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Communicated by Arnaud Hélias.

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Yoshikawa, N., Matsuda, T. & Amano, K. Life cycle environmental and economic impact of a food waste recycling-farming system: a case study of organic vegetable farming in Japan. Int J Life Cycle Assess 26, 963–976 (2021). https://doi.org/10.1007/s11367-021-01879-0

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