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Image: Circular secondary sedimentation tank

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Description: Activated sludge sewage treatment plant at Arrudas Treatment Plant, Belo Horizonte, Brazil: Circular secondary sedimentation tank
Title: Circular secondary sedimentation tank
Credit: Marcos von Sperling
Author: Marcos von Sperling
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Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
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