Environmental life cycle assessments of producing maize, grass-clover, ryegrass and winter wheat straw for biorefinery

Ranjan Parajuli, Ib Sillebak Kristensen, Marie Trydeman Knudsen, Lisbeth Mogensen, Andrea Corona, Morten Birkved, Nancy Peña, Morten Graversgaard, Tommy Dalgaard

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    Abstract

    The aim of this study is to assess the potential environmental impacts of producing maize, grass-clover, ryegrass, and straw from winter wheat as biomass feedstocks for biorefinery. The Life Cycle Assessment (LCA) method included the following impact categories: Global Warming Potential (GWP100), Eutrophication Potential (EP), Non-Renewable Energy use (NRE), Potential Fresh Water Ecotoxicity (PFWTox) and Potential Biodiversity Damages (PBD). The results showed that GWP100 (in kg CO2 eq, including contribution from soil carbon change) for producing 1 ton of dry matter (t DM) was highest for ryegrass, grass-clover and maize, and lowest for straw. The carbon footprints of ryegrass, grass-clover and maize were affected by including the contribution from soil organic carbon (SOC) changes. Nitrous oxide emissions and emissions related to the production of agro-chemicals (including N-fertilizer) were other hotspots in the carbon footprint. The EP calculated per t DM was highest for grass-clover, ryegrass and maize, and was lowest for straw. NRE use (MJ eq/t DM) was highest for ryegrass, grass-clover and maize and lowest for straw. Major hotspots were diesel use for field operations and agro-chemicals production. The PBD, expressed as Potentially Disappeared Fraction (PDF) showed the highest adverse impact to biodiversity in maize, followed by straw, whereas the results showed relatively lower impact for ryegrass and grass-clover. The PFWTox (CTUe/t DM), at farm level was highest for straw, followed by maize, whereas the values were significantly lower for grass-clover and ryegrass. These variations in ranking of
    the different biomasses productions using different impact categories for environmental performance showed that it is important to consider a wider range of impact categories for assessing environmental sustainability.
    Original languageEnglish
    JournalJournal of Cleaner Production
    Volume142
    Issue number4
    Pages (from-to)3859–3871
    Number of pages13
    ISSN0959-6526
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Life Cycle Assessment
    • Biorefinery
    • Enviromental Impacts
    • Ecotoxicity
    • Soil Organic Carbon
    • Denmark

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