Abstract
Multi-criteria sustainability assessments were completed for the construction of a net-alkaline mine drainage passive treatment system (PTS) in northeastern Oklahoma to compare resource use and greenhouse gas emissions with a hypothetical active treatment system (ATS) alternative. Emergy analysis, an environmental accounting method assessing resource use, and carbon footprint analysis, a tool to evaluate greenhouse gas emissions, were completed for the construction of both systems. Assessing sustainability using multiple criteria is important in evaluating systems on the basis of resource use and environmental impact. Construction of the hypothetical ATS required seven times more emergy purchased from the economy and emitted three times more carbon dioxide equivalents than construction of the PTS. Concrete was the largest factor in both the emergy analysis (ATS and PTS) and carbon footprint (ATS only). Diesel fuel was the largest factor in the carbon footprint of PTS construction. This multi-criteria sustainability assessment shows that a hypothetical ATS alternative to the PTS would have used more resources and emitted more greenhouse gases during construction.
Zusammenfassung
An Hand mehrfacher Kriterien wurden Nachhaltigkeitseinschätzungen für die Konstruktion eines passiven Aufbereitungssystems (PTS) für netto-alkalische Bergbauwässer im nordöstlichen Oklahoma erstellt, um den Verbrauch von Ressourcen und die Freisetzung von Treibhausgas mit der hypothetischen Variante eines aktiven Aufbereitungssystems (ATS) zu vergleichen. Für die Konstruktion beider Systeme wurde eine Emergieanalyse, welche der umweltbezogenen Bilanzierung und Einschätzung des Ressourcenverbrauches dient, und eine Analyse des Kohlenstoff-Fußabdruckes, ein Werkzeug zur Einschätzung von Treibhausgasemission, ausgeführt. Die Nutzung mehrfacher Kriterien bei der Einschätzung von Nachhaltigkeit ist wichtig, wenn Systeme auf der Basis von Ressourcenverbrauch und Umwelteinwirkung bewertet werden. Die Konstruktion des hypothetischen ATS benötigte sieben mal mehr Emergie, aus der Wirtschaft angekauft, und verursachte eine dreifach höhere Emission von Kohlendioxyd-Äquivalenten als die Konstruktion des PTS. Beton war der größte Faktor sowohl in der Emergieanalyse (ATS und PTS) wie im Kohlenstoff-Fußabdruck (nur ATS). Dieseltreibstoff war der größte Faktor im Kohlenstoff-Fußabdruck der PTS-Konstruktion. Diese auf mehrfachen Kriterien beruhende Nachhaltigkeitseinschätzung zeigt, dass die Alternative eines hypothetischen ATS statt des PTS während der Erbauung mehr Ressourcen verbraucht und mehr Treibstoffgase emittiert hätte.
Resumen
Relevamientos de sustentabilidad utilizando multi-criterios fueron realizados para la construcción de un sistema de tratamiento pasivo de drenaje alcalino de mina (PTS) en el noreste de Oklahoma, comparando el uso de recursos y las emisiones de gases invernadero con la alternativa hipotética de construir un sistema de tratamiento activo (ATS). El análisis “emergy” -método ambiental de relevar el uso de recursos- y análisis de huella de carbono -herramienta para evaluar emisiones de gases invernadero- fueron utilizados en la comparación de la construcción de ambos sistemas. Los relevamientos de sustentabilidad usando criterios múltiples son importantes en la evaluación de sistemas sobre la base del uso de recursos y del impacto ambiental. La construcción de un hipotético ATS requeriría 7 veces más energía y emitiría 3 veces más dióxido de carbono que la construcción del PTS. El concreto fue el mayor factor en el análisis “emergy” (ATS y PTS) y en la huella de carbono (sólo ATS). El combustible diesel fue el mayor factor en la huella de carbono dejada por la construcción del PTS. Este relevamiento de sustentabilidad utilizando múltiples criterios muestra que una hipotética alternativa ATS al PTS hubiera usado más recursos y emitido mayor cantidad de gases invernadero durante su construcción.
摘要
利用多指标可持续评价系统评价了在俄克拉何马州(Oklahoma)东北部建立碱性废水被动处理系统(PTS)的环境影响,对比了构建被动处理系统(PTS)与假设的主动处理系统(ATS)的资源利用和温室气体排放差异。能值分析是一种用于评价资源利用程度的环境计算方法,碳足迹分析是一种评价温室气体排放量的分析工具。资源利用和环境影响是多标准可持续性评价的重要评价因素。构建假设的主动处理系统(ATS)比构建被动处理系统(PTS)能量消耗多7倍和二氧化碳排放多3倍。混凝土是主动与被动处理系统的能值分析和主动处理系统的碳足迹分析的最主要影响因素,柴油燃料是被动处理系统的碳足迹分析的最主要影响因素。多因素可持续性评价结果表明,构造假设的主动力处理系统比构建被动处理系统消耗更多资源、排放更多温室气体。
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Winfrey, B.K., Nairn, R.W., Tilley, D.R. et al. Emergy and Carbon Footprint Analysis of the Construction of Passive and Active Treatment Systems for Net Alkaline Mine Drainage. Mine Water Environ 34, 31–41 (2015). https://doi.org/10.1007/s10230-014-0304-6
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DOI: https://doi.org/10.1007/s10230-014-0304-6