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Screening LCA of French organic amendments and fertilisers

Avadi A.. 2020. International Journal of Life Cycle Assessment, 25 (4) : p. 698-718.

DOI: 10.18167/DVN1/OYD9WF

DOI: 10.1007/s11367-020-01732-w

Introduction In France, agricultural recycling of organic waste is widespread, but LCIs of organic waste treatments are scarce. This work presents LCIs of the most relevant organic waste treatments yielding residual organic amendments and fertilisers, and organic residue–based industrial processes yielding commercial organic amendments and fertilisers, in France. It also presents the results from a screening LCA performed on these LCIs. Material and methods LCIs were built frommainly secondary data sources. Four functional units were retained: 1 t fresh mass of final product and 1 t of N, P, or K in fresh mass. Economic allocation was applied, following the French Environment and Energy Management Agency position. The International Reference Life Cycle Data System 2011 suit for impact assessment was retained, and all impacts were expressed as single scores to facilitate comparisons. Organic wastes considered were liquid and solid manures, agro-industrial residues, sewage sludge, green wastes and harvest residues, and biowaste. Treatment steps modelled were stocking, shredding, sieving, and mixing of substrates; anaerobic and aerobic treatments; thickening, dewatering, drying, and pelletising; various biological and physicochemical treatments of phase-separated liquid fractions; and the industrial production of organic amendments and fertilisers. Comparisons were performed among products classified as amendments or fertilisers. Results and discussion LCIs of typical treatment routes are presented, complemented with screening life cycle impact assessment results. Dried sludge and treated solid fractions of agricultural digestates present consistently higher impacts than any other amendment, mainly due to their associated energy use, relatively lowN contents, and the use of maize silage as input. These items contribute in average > 50% of the aggregated impacts. Untreated manure and slurry feature the lowest relative impacts for all functional units. Compost-based comm

Mots-clés : engrais; amendement organique; analyse du cycle de vie; boue d'épuration; digesta; compost; traitement des déchets; recyclage des matières organiques; france

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