Estimating of the Carbon Footprint (CFP) of Sanitary Paper —A Case Study of Sanitary Paper Mill on Fuji City, Shizuoka Prefecture—

摘要

Displaying carbon footprint (CFP) of manufactured articles for daily use is very important to "visualize" the environmental burden, especially life cycle C02 emission, from daily life. The goal of this study is to evoke people's awareness to the environmental burden in daily life through the calculation of CFP from the sanitary paper, in particular sanitary paper, produced in Fuji city, Shizuoka prefecture. Functional unit is applied to the CFP per 1 package consist of 6 sanitary papers with LDPE package. The life cycle stages in this study are classified into 5 stages, and CFP is calculated as the total amount of GHG emission from each processes. The calculation result of CFP of 1 package of sanitary papers was 2,406.90 g-CO2/package references to unacceptable product category rule (PCR) of "paper and paper board (PCR-025)". The component ratio of each life cycle stages are : raw materials procurement stage 5.8%, production stage 75.8%, distribution and seEing stage 13.7%, operation and maintenance stage 0 %, disposal and recycling stage 4.7%. The most CO2 is emitted from energy usage of the production stage, which accounts for 72.1% of the total CO2 emission. Therefore, it is very important to choose the energy sources with the least environmental burden, e.c. renewable energy. All sanitary paper mills discharged great deal of paper sludge (PS) from daily process. The CFP of sanitary paper is varies from the calculation conditions based on waste water treatment methods and PS treatment methods. Therefore, it is necessary to review the PCR for clarify the rules of wet end process, especially waste water and PS treating methods.