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Related to sedimentation tank: aeration tank
sedimentation tank[‚sed·ə·mən′tā·shən ‚taŋk]
A tank in which suspended matter is removed either by quiescent settlement or by continuous flow at high velocity and extended retention time to allow deposition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.