Fired-Clay Bricks Incorporating Biosolids: Comparative Life-Cycle Assessment
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 7
Abstract
A comparative life-cycle assessment (LCA) is undertaken to evaluate the environmental impacts of fired-clay bricks incorporating biosolids from Melbourne Water’s Victorian Eastern Treatment Plant (ETP) and Western Treatment Plant (WTP). The scope of this comparative LCA study ranges from cradle to gate and involves brick soil and biosolids extraction, transportation, crushing and proportioning, grinding and screening, shaping, drying, firing, and packaging. The energy used during the firing process of the biosolids-amended bricks, concentrate of gas emission, and emission factors is quantified experimentally at the laboratory scale. The potential environmental impacts are analyzed and compared by means of the ReCiPe midpoint LCA method using SimaPro 8.0.5.13. The results of the life-cycle impact assessment (LCIA) show that the incorporation of biosolids into bricks is environmentally favorable and is a promising alternative approach with respect to most of the environmental impacts except water depletion, which is mainly due to the higher water demand of biosolids-amended bricks during the shaping process. In addition, bricks incorporating ETP biosolids show a relatively higher potential for ozone depletion and acidification because of the higher fuel usage for ETP biosolids transportation compared with that of brick soil and WTP biosolids. A sensitivity analysis is carried out to address the impact of the assumptions and variables used in the LCA model on the final comparative LCIA results. A comparative uncertainty analysis is conducted to assess the effect of uncertainty in the inventory data on the results of the LCIA indicators. The methods used in this study and discussed in this paper can be used for the LCA of different construction materials.
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Acknowledgments
The results presented in this paper are part of an ongoing postgraduate study on recycling biosolids in fired-clay bricks. The authors thank the Australian Government Research Training Program scholarship, Melbourne Water, and RMIT University HDR Publication grant (RMIT HDRPG), for their financial and in-kind support. In addition, the technical assistance of the Civil and Chemical Engineering laboratories is gratefully acknowledged. Furthermore, the authors are immensely grateful to Boral Bricks Pty Ltd for their support in providing brick soil for this research.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 7 • July 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Sep 28, 2017
Accepted: Dec 11, 2017
Published online: Apr 23, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 23, 2018
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