Unraveling the Global Warming Mitigation Potential from Recycling Subway‐Related Excavated Soil and Rock in China Via Life Cycle Assessment
Zhang, Hui
Schiller, Georg
Feng, Haibo
Gao, Xiaofeng
Li, Enming
Li, Xiujie
DOI: https://doi.org/10.23689/fidgeo-4356
Zhang, Hui; 2School of Chemistry and Environmental Engineering, Wuhan Institute of Technology Wuhan China
Feng, Haibo; 3 Department of Mechanical and Construction Engineering Northumbria University Newcastle United Kingdom
Gao, Xiaofeng; 4 Department of Urban Engineering The University of Tokyo Tokyo Japan
Li, Enming; 5 School of Resources and Safety Engineering Central South University Changsha China
Li, Xiujie; 6 Green Lighting System Lab, School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen China
Abstract
Many cities across China are investing in subway projects, resulting in much subway construction activity, which has experienced a surge over the past decade. The construction activities inevitably cause a dramatic quantity of subway‐related excavated soil and rock (ESR). How to manage it with minimal environmental impact on our urban ecosystem remains an open question. The present study evaluates global warming potential (GWP, expressed by CO2 eq) from different ESR recycling and landfilling scenarios via a life cycle assessment (LCA) model based on primary field investigation combined with the LCA software database. The study results illustrate that recycling ESR can significantly reduce greenhouse gas emissions. In comparison with traditional construction materials, the scenarios found that a cumulative amount of 1.1 to 1.5 million tonnes (Mt) of CO2 eq emissions could have been mitigated by using ESR generated between 2010 and 2018 to produce baking‐free bricks and recycled baked brick. Using cost–benefit analysis, potential economic benefits from recycled sand and baking‐free bricks are found to reach US$9 million annually. The findings of this study could provide better recycling options for ESR‐related stakeholders. It is important to mention that there still is much work to be done before this recycling work can be popularized in China. Integr Environ Assess Manag 2021;17:639–650. © 2020 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC)
KEY POINTS:
This study focuses on the global warming potential (GWP) assessment of excavated soil and rock (ESR). Cumulative CO2 mitigation potential by recycling ESR was calculated. More than US$8 million profit could have been reached annually between 2006 and 2018. Cumulative CO2 mitigation potential could have been as high as 1.5 Mt from 2010 to 2018.
Subjects
Excavated soil and rock (ESR)Recycling
CO2 mitigation
Life cycle assessment
Cost–benefit analysis