Journal
ECOLOGICAL INDICATORS
Volume 126, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ecolind.2021.107675
Keywords
Emergy; Co-production system; Modified physical quantity method; Transformity; Efficiency assessment
Categories
Funding
- Korea Institute for Advanced of Technology (KIAT) - Ministry of Trade, Industry and Energy, Korea [P0008421]
- Basic Research Program of the National Research Foundation of Korea (NRF) by the Ministry of Science and ICT [NRF2020R1I1A2072313]
- Ministry of Health & Welfare (MOHW), Republic of Korea [P0008421] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study introduces a modified physical quantity method (MPQM) to address methodological issues in emergy assessment in co-production systems, showing that MPQM provides more accurate results compared to other emergy accounting methods. However, inefficiency was found in Eucalyptus pulp production using the MPQM approach. These findings are expected to enhance the methodological aspects of emergy accounting based on the physical quantity criterion.
Emergy accounting in a system with co-production branch is of great scientific interest since each branch corresponds to a different transformity value. In previous studies, limitations associated with emergy accounting in co-production systems have been highlighted where some ?inputs? have to be added to obtain a ?useful? product from a ?co-product? ? giving rise to inaccuracies in the emergy accounting process. To address these methodological aspects of emergy assessment in co-production systems, a modified physical quantity method (MPQM) ? that goes in line with the standard emergy algebra ? has been proposed in order to provide a different perspective for accounting co-products efficiency. The robustness of MPQM has been verified by taking the case study of Eucalyptus pulp production and a comparison is made against conventional and energy/exergy weighting methods. As per the results, MPQM was able to provide accurate results for co-production systems as compared with other emergy accounting methods. However, the case of Eucalyptus pulp production was found to be ?inefficient? following the MPQM approach. These findings are expected to strengthen the methodological aspects of emergy accounting based on the physical quantity criterion.
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