用secondary sedimentation造句子，“secondary sedimentation”造句

The culture of active sludge of secondary sedimentation tank of a s ew age treatment plant makes the amount of heterotroph in the sludge be reduced and the amount of nitrobacteria be increased and become the dominating one.

For the secondary sedimentation tank, an uniform outlet is needed to prevent losses of suspended solids.

SZN Central transmission mud scraper and sucker applies to the radial flow secondary sedimentation tank for removal of sludge and scum.