An environmental assessment model of construction and demolition waste based on system dynamics: a case study in Guangzh
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ENVIRONMENTAL TOXICOLOGY AND BIOGEOCHEMISTRY OF ECOSYSTEMS
An environmental assessment model of construction and demolition waste based on system dynamics: a case study in Guangzhou Jingkuang Liu 1 & Yedan Liu 1 & Xuetong Wang 1 Received: 16 July 2019 / Accepted: 18 November 2019 # Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract At present, China is in the rapid development stage of urbanization, and construction activities are becoming more frequent. This is accompanied by a large amount of construction and demolition waste (C&DW), which raises many problems with its governance, such as occupying valuable land resources, causing air pollution, and consuming raw materials. In this study, taking Guangzhou as an example, the system dynamics principle was used to establish an environmental assessment model of C&DW, and Vensim software was used to simulate and analyze the environmental, economic, and social impacts of various disposal methods of C&DW. The results showed that (1) among all waste disposal methods, landfill disposal had the highest greenhouse gas emissions. It was estimated that the greenhouse gas emissions from landfill disposal will account for 75% of the total emissions in 2030, while the greenhouse gas emissions from recycling disposal will only account for 0.5%. (2) The simulation results showed that, according to the current data, the land area occupied by waste landfills and illegal dumping in 2030 will be about 4.88 million m2, and the economic loss caused by land loss and global warming will account for 9.1% of Guangzhou’s GDP in 2030, which is equivalent to the national economy of a regional city with a less developed economy. (3) Enhanced supervision could significantly reduce the amount of illegal dumping, but its effect on landfill disposal and recycling would be very limited. According to the results of the simulation analysis, some suggestions were put forward to improve the environmental, economic, and social impact of C&DW disposal in Guangzhou. Keywords Construction and demolition waste . Environmental assessment . System dynamics . Greenhouse gas emissions
Introduction With the continuous advancement of China’s urbanization process and the rapid growth in the national economy, China’s comprehensive national strength has significantly increased, and people’s standard of living has generally reached a comfortable level. However, environmental problems generally accompany economic growth. As the main pillar of the national economy, the construction industry has been developing rapidly. A large amount of construction and demolition waste (C&DW) has been produced owing to the continuous increase in new buildings, building renovations, reconstruction, repairs,
Responsible editor: Philippe Garrigues * Xuetong Wang [email protected] 1
School of Management, Guangzhou University, 510006 Guangzhou, People’s Republic of China
demolition, and construction projects and infrastructure projects. According to statistics, the newly completed areas in China cover 2 billion m2/year,
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