5.2. Conclusions and future research
The present study has conducted an application of LCA on two
novel remanufacturing technologies (supercritical CO2 cleaning
and liquid blasting cleaning) and two conventional ones (high
temperature decomposition and shot blasting). Electricity used in
SCCO2 cleaning may originate from different power system and the
fuel consumed in high temperature decomposition may have
different energy structure. Environmental impacts of different
scenarios in each remanufacturing cleaning system are compared
separately. The investigated environmental impact indicators
include GWP, AP, CADP, WEP, RI. Normalization results of these
indicators of group A are much less than that of group B, especially
the AP and CADP. In addition, comprehensive environmental
impact of group A is 0.34 104 (electricity from northeast power
grid), while that of group B is 3.38 103 (100% diesel and 0%
natural gas without vent gas treatment). Apparently, the novel
cleaning methods represent a preferable environmental performance
since the comprehensive impact score of group B is
approximately 10 times greater than that of group A. SCCO2
cleaning is more environmental friendly when using the electricity
from central and southern power grid. By contrast, northern and
northeastern power systems have greater environmental loads
among other national power systems.