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OpenStudy (anonymous):
What do both the water treatment plant and the waste water treatment plant use to measure the amount of substance collecting at the bottom of the tanks?
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OpenStudy (anonymous):
During sedimentation, particles gradually settle at the bottom of the settling basin and form layers of sludge. The thickness of the sludge blanket is typically measured using ultrasound technology which measure the time it takes for "echos" to return from the surface of the sludge layer.
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