Abstract
Natural disasters, new urbanization, and urban renewal activities generated a large amount of construction and demolition waste (C&DW), and managing C&DW has become an urgent problem to be solved in the construction of "Zero-waste cities." Based on the calculation of C&DW generation in China from 2005 to 2019, this study explored spatial heterogeneity and factors influencing C&DW in China by Exploratory Spatial Data Analysis (ESDA) and Geographically Weighted Regression (GWR) method. The results showed that C&DW generation in China increased every year, and the overall distribution was characterized as "high in the east and low in the west," with distinct regional differences. The generation intensity of C&DW in China showed a decreasing trend every year. The regions with rapid growth of C&DW generation were concentrated in the eastern coastal areas, and there was significant spatial heterogeneity in the growth trend. There is a significant spatial autocorrelation in C&DW generation in China. The factors of population size, per capita gross domestic product, and the scale of the construction industry played a positive role in promoting C&DW generation in each province, whereas labor efficiency played a negative role inhibiting C&DW generation, which has a significant temporal and spatial heterogeneity. The results extend C&DW management theory and help the policy maker to formulate regional differentiation policies as China and developing country.
Highlights
In recent years, with the promotion of new urbanization and urban renewal activities, as well as the impact of natural disasters such as earthquakes, construction and demolition waste (C&DW) generation has increased
This was primarily because there were differences in population size and economic development basis in different provinces, which led to different growth rates of C&DW generation
C&DW generation is the main component for formal solid waste in China
Summary
With the promotion of new urbanization and urban renewal activities, as well as the impact of natural disasters such as earthquakes, C&DW generation has increased. It was estimated that the total amount of C&DW generated in China every year was approximately 2 billion tons, accounting for approximately 30%~40% of the total amount of urban waste, and the environmental problem of C&DW has become increasingly prominent (Wang et al 2021). The recycling rate of C&DW in China is still less than 5% (NDRC 2014), and C&DW generation is increasing year by year. The spatial and temporal distribution of C&DW generation and its influencing factors are important issues in the management of C&DW reduction. How to identify regional differences in the degree of influence of individual factors on C&DW, and put forward differential regional reduction measures and collaborative regional reduction strategies is an urgent problem requiring attention in current C&DW management (C&DWM). Research on influencing factors was mostly conducted from an overall perspective (Ding and Xiao 2014; Wu et al 2019; Ye and Yuan 2014), ignoring the spatial heterogeneity of the factors influencing regional C&DW generation
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