废旧地膜回收利用模式探索、现实困境与优化路径OA北大核心CSTPCD

The aim of this study was to investigate waste mulch film recycling in China,with a focus on the innovative initiatives of Gansu Province and Shandong Province.Through this survey,the experience and challenges of these initiatives were documented and the economic and ecological benefits of various recycling methods were compared.In Shandong Province,the total volume of plastic film was reduced through innovative peanut planting systems,and mulch film trash was greatly reduced via an administrative hierarchy recovery network and a"straw+film"synergistic recovery mode.In Gansu Province,mulch film recycling was achieved in rural areas through a full-chain,multi-agent synergistic recycling model and an integrated"multi-function"recovery and treatment model of enterprises.The economic benefit per ton of waste mulch film(a mixture of waste plastic film,straw,roots,soil,etc.)was recorded.After separation and cleaning,the impurity rate after separation and cleaning was found to be approximately 20% to 30% and the economic value of granulitization was 20-120 yuan·t-1,with a CO2 equivalent of 8.68 kg CO2e·t-1.In comparison,the value gained from power generation by incineration was 129-194 yuan·t-1,with a CO2 equivalent of 1.83 kg CO2e·t-1.Challenges to enhancing recycling efficiency include improper mulch film use,high trash content in recovery,low mechanical recovery rates,unscientific resource allocation,limited sustained financial support,and a weak cash flow-generating capacity in the mulch film recycling industry.The primary paths for mulch film recovery in China are substitution-based source reduction and recycling system construction.The main recycling methods are power generation by incineration and granulitization,with incineration offering greater economic and carbon reduction benefits over granulitization.Addressing current challenges involves developing local-specific technical regulations for mulching,strengthening standardized control of mulch film production and sales,innovating machinery and equipment,coordinating regional resource allocation,mobilizing long-term financial and social capital resources,and developing market mechanisms for transforming the value of ecological products.