Life Cycle Assessment applied to construction and demolition waste treatment: proposal of a Brazilian scenario

SUSTAINABLE BUILT ENVIRONMENT D-A-CH CONFERENCE 2019

生态环境科学

Hackenhaar, I.C.^1 ; Waskow, R.P.^2 ; Tubino, R.^2 ; Passuello, A.^1

Postgraduate Program in Civil Engineering, Construction and Infrastructure, PPGCI, Federal University of Rio Grande Do sul, UFRGS, Porto Alegre - RS

90035-190, Brazil^1

Postgraduate Program in Mining Metallurgical and Materials Engineering, PPG3M. Federal University of Rio Grande Do sul, UFRGS, Porto Alegre - RS

90035-190, Brazil^2

关键词: Built environment;    Construction and demolition waste;    Environmental potential impacts;    Life Cycle Assessment (LCA);    Life Cycle Inventory;    Management options;    Management scenarios;    Recycled materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/323/1/012054/pdf
DOI  :  10.1088/1755-1315/323/1/012054

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Important amounts of construction and demolition wastes (CDW) are currently generated in several countries. Considering the correct management of this kind of residue, and the search for its noblest use, several studies have focused on the environmental potential impacts from CDW management. Life Cycle Assessment (LCA) is often used to investigate the potential environmental impacts over the life cycle of a product, thus becoming an important tool to support decision-making. CDW recycling process produces coarse, fine and mix aggregate as outputs, characterizing a multifunctional process. But, how CDW's LCA should be run, considering a circular and more sustainable built environment? Thus, the objective of this work is to explore the basic premises in proposing a product system for the CDW recycling process in Brazil. For this, data available in the literature on the recycling process in Brazil and in other countries support the definition of the product system. The complexity of this management option is explored, considering how the use of the recycled materials interfere in the scope, objective, unit function and other modelling choices, as well as reliability of CDW studies. Finally, the datasets provided by Ecoinvent are examined in order to promote debate on data adaptation, followed by remarks on the most appropriate choices on allocation in the CDW LCA. The cut-off system modelling associated with the new perspective on the avoided burden approach is concluded by the authors to be the most suitable for this waste recycling multifunctional processes. Understanding system models is key. When no inventory adaptation is intended, available inventory datasets are more advisable to be used when performing end of life scenarios only, once burdens differ according to countries management scenarios, as well as life cycle inventory approaches.