| In recent years,the urbanization process in our country has been intensified.Construction activities such as new construction,expansion,repair,demolition have become more frequent,and the output of construction waste has increased year by year.For huge amounts of construction waste run counter to the concept of low-carbon cities and sustainable development,how to effectively and properly manage construction waste has become the focus of attention of government departments and scholars.Therefore,in order to effectively manage construction waste and improve the recycling rate of construction waste,from the environmental perspective,we combined with economic and social evaluation,used the system dynamics method to study the different treatment methods of construction waste in the environmental,economic and social aspects,established the comprehensive benefit evaluation model of construction waste,and obtained relevant research conclusions through model simulation analysis.At the same time,based on the diamond model theory,the factors affecting the management of construction waste are analyzed to provide a feasible management strategy for the treatment of construction waste.The research shows:(1)Among the construction waste disposal methods,the recycling costs are the highest,and the landfill costs are the lowest,accounting for only 2.5% of the recycling costs,and the illegal dumping costs accounts for 3%.For the costs of landfill is relatively low compared with other treatment methods,many construction units will choose the low-cost way to deal with construction waste.As a result,China's current construction waste treatment is still mainly landfill,the utilization rate of recycling of construction waste is low.(2)Among the three disposal methods of illegal dumping,recycling and landfill,the greenhouse gas emission from landfill treatment accounts for 75% of the total emission,while the greenhouse gas emission from recycling treatment only accounts for 0.6%.Obviously,reducing the landfill disposal capacity of construction waste and increasing the recycling rate of waste are effective ways to reduce greenhouse gas emissions.(3)If the current recycling rate is low,in the next few years,the land occupied due to the landfill and illegal dumping of construction waste accounts for 0.09% of the total area of Guangzhou,while the economic loss caused by the land occupied by landfill and the greenhouse gas emissions is equivalent to the GDP of a slightly backward Prefecture level city.(4)The amount of construction waste recycling is directly proportional to the number of jobs in the construction waste recycling industry.With the increase of recycling,the number of jobs is also increasing,and its social benefits are significant.At the same time,it can be seen from the simulation results that the construction waste recycling method hasthe highest comprehensive benefit among various waste treatment methods.(5)A diamond model of construction waste recycling industry is proposed.According to the development of construction waste recycling in China,we analyzed the factors affecting the development of construction waste recycling industry,and proposed corresponding solutions.At the same time,we combined with the disposal of construction waste in Guangzhou.A strategic management mechanism for construction waste recycling in Guangzhou was formulated to propose a strategic development plan for construction waste recycling in Guangzhou.To some extent,the comprehensive benefit evaluation model of construction waste treatment established in the study can truly reflect the evaluation of various treatment methods of construction waste in economy,environment and society.The simulation results provide theoretical basis for relevant government departments to formulate relevant regulations and policies for construction waste management.The results also promote the development of China's construction waste management and construction waste recycling industry to achieve the goal of sustainable development. |
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