Environmental inventory modelling of the use of compost and peat in growth media preparation |
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| Institution: | 1. College of Landscape Architecture, Northeast Forestry University, Harbin, 150040, China;2. Department of Horticultural Sciences, Texas A&M University, College Station, TX, 77843, USA;3. College of Forestry, Nanjing Forestry University, Nanjing, 210037, China;4. Department of Horticultural Sciences, Texas A&M AgriLife Extension Service, College Station, TX, 77843, USA;1. Departamento de Ingeniería Geológica y Minera, E.T.S.I. Minas y Energía, Universidad Politécnica de Madrid, C/Ríos Rosas n°21, 28003 Madrid, Spain;2. School of Civil, Environmental and Chemical Engineering, RMIT University, GPO Box 2476, 3001 Melbourne, VIC, Australia;3. Departamento Producción Agraria, E.T.S.I. Agrónomos, Universidad Politécnica de Madrid, Ciudad Universitaria, 28004 Madrid, Spain;1. Department of Inorganic Chemistry and Chemical Engineering, University of Cordoba, Campus Universitario de Rabanales, Building Marie Curie (C-3), Ctra. N-IV, km 396, 14071 Cordoba, Spain;2. Department of Statistics, Econometry, Op. Res., Business Org. and Applied Econ., University of Córdoba, Campus Universitario de Rabanales, Building Albert Einstein (C-2), Ctra. N-IV, km 396, 14071 Cordoba, Spain;1. ENT Environment and Management, C/ Josep Llanza 1-7, segon pis, oficina 3, 08800, Vilanova i la Geltrú, Barcelona, Spain;2. Fundació ENT, C/ Josep Llanza 1-7, segon pis, oficina 3, 08800, Vilanova i la Geltrú, Barcelona Spain;3. Universitat Politècnica de Catalunya (UPC), Campus del Baix Llobregat, Edifici D4 (Campus Baix Llobregat), C. Esteve Terradas, 8 08860, Castelldefels, Spain;4. Agència de Residus de Catalunya (ARC), C/ Dr. Roux, 80, 08017, Barcelona, Spain;1. University of Belgrade, Faculty of Mechanical Engineering, Innovation Center, 16 Kraljice Marije Str., 11000, Belgrade, Serbia;2. University of Belgrade, Faculty of Mechanical Engineering, Department of Thermal Engineering, 16 Kraljice Marije Str., 11000, Belgrade, Serbia;3. University of Belgrade, Faculty of Technology and Metallurgy, 4 Karnegijeva Str., 11000, Belgrade, Serbia;1. Department of Crop Sciences, University of Illinois Urbana-Champaign, Urbana, IL 61801, United States;2. Department of Land, Air and Water Resources, University of California-Davis, Davis, CA 95616, United States |
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| Abstract: | Compost produced from biological treatment of organic waste has a potential for substituting peat in growth media preparation. The life-cycle-inventories (LCIs) of the two alternatives were compared using LCA-modelling (EASEWASTE) considering a 100-year period and a volumetric substitution ratio of 1:1. For the compost alternative, the composting process, growth media use, and offsetting of mineral fertilizers were considered. For the peat alternative, peatland preparation, excavation, transportation, and growth media use were considered. It was assumed that for compost 14% of the initial carbon was left in the soil after 100 years, while all carbon in peat was mineralized. With respect to greenhouse gas emissions, the former is considered a saving, while the later is considered an emission, because peat in a peatland is considered stored biogenic carbon. The leaching during the growth media use was assessed by means of batch leaching tests involving 4 compost samples and 7 peat samples. The compost leached 3–20 times more heavy metals and other compounds than the peat. The life-cycle-assessment showed that compost performs better regarding global warming (savings in the range of 70–150 kg CO2-eq. Mg?1) and nutrient enrichment (savings in the range of 1.7–6.8 kg NO3 Mg?1 compost), while peat performs better in some toxic categories, because of the lower content of heavy metals. |
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