废塑料资源化途径的碳排放比较研究OA

Against the backdrop of continuously growing global plastic waste production,recycling waste plastics had become a critical challenge in driving the green and low-carbon transformation of the industry.In response,this study applied the life cycle assessment(LCA)method and the emission factor approach to calculate carbon emissions across six plastic recycling pathways.The aim was to enrich carbon accounting research in the field of solid waste resource utilization and to provide a scientific basis for industrial carbon reduction and carbon trading.The model quantified indirect carbon emissions from operational energy consumption,direct carbon emissions from plastic decomposition,and carbon credits generated through resource recovery.It also analyzed variations in carbon emissions and net carbon emissions across different recycling pathways.The results showed that regarding carbon emissions,co-combustion,solid fuel production,and direct incineration exhibited relatively high emission levels,while pyrolysis,physical recycling,and alcoholysis yielded lower emissions.Moreover,in terms of carbon credits,pyrolysis offered the highest carbon offset(approximately-3 024 kgCO2e),whereas physical recycling,with a recovery rate of 88%,provided a carbon credit of-991.4 kgCO2e.As for net carbon emissions,the ranking for treating 1 t of waste plastic was as follows:direct incineration(1 104 kgCO2e)>co-combustion(185.8 kgCO2e)>solid fuel production(115.4 kgCO2e)>alcoholysis(-259.5 kgCO2e)>physical recycling(-991.4 kgCO2e)>pyrolysis(-2 592 kgCO2e).This study demonstrated that,among waste plastic resource utilization pathways,pyrolysis outperformed direct incineration in terms of both carbon emissions and carbon offset benefits.Its full life-cycle carbon footprint showed a negative carbon trend,making it a feasible pathway for waste plastic resource utilization to contribute to emission reduction goals.These findings could serve as a reference for carbon accounting in other waste plastic resource recovery processes.