The new technology is suitable for vacuum residue of dense crude oil. The breaking depth can be increased. As the unit has passed a long term practice, it can be a reference for similar units.

The collection and disposal of food residue in Shenzhen is planned, the programming term from year of 2006 to 2020.

Results The long term effectiveness of various treatments in residue crown group has no statistically significant difference(P>0.05);