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Metabolic network evolution of hazardous waste by material flow analysis integrated with complex network analysis
Liping Zhan1, Rui Zhao1, Xin Xiong1
1School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu, 611756, China.
Hazardous waste networks in Chengdu grew significantly, with waste generation nodes and paths increasing. Integrating collection centers and recycling improved network connectivity and availability for better hazardous waste management.
Area of Science:
- Environmental Science
- Urban Metabolism
- Network Analysis
Background:
- Hazardous waste management in megacities presents complex challenges.
- Understanding the flow and evolution of hazardous waste is crucial for sustainable urban development.
Purpose of the Study:
- To construct and analyze the hazardous waste metabolic network in Chengdu from 2019 to 2022.
- To investigate the impact of policy interventions on network connectivity and availability.
Main Methods:
- Combined material flow analysis and complex network analysis.
- Utilized indicators like network density, centrality measures, and stability.
- Examined policy impacts on network connectivity and availability.
Main Results:
- Hazardous waste generation nodes and metabolic paths increased by 188.49% and 276.73%, respectively.
- Total hazardous waste increased from 2.27 × 10^5 to 3.15 × 10^5 tons.
- Automobile and electronic equipment manufacturing were key sources; electronic waste generation grew by 35.05%.
Conclusions:
- Hazardous waste generation and pathways are expanding in Chengdu.
- Policy interventions, including centralized collection and recycling, can enhance network efficiency.
- Findings offer insights for precise hazardous waste management strategies.
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