The first single project of Dalian Hengli Petrochemical wastewater treatment project - oily sewage secondary sedimentation tank A onetime water testing was successfully on 1^st August, and receive unanimous praiseby the owners and the supervision.
The secondary sedimentation tank water testing depth is 4.8m, and according to the drawings, water flooding divide to three time, first water folding shall reach on third of the tank and observe for 7 days before the second one. The second and third water folding shall observe for 2 days with on third water, and meanwhile, settlement observation shall be taken everyday. The whole process from 20^th July to 1^st August was very successful without leaking point.
 
(Photo and Report by Zhang Wenliang)