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Particle count and online turbidity interference from bubble formation
Bubble formation affects particle count and online turbidity measurements, but the water industry does not routinely employ a methodology for determining when bubbles are skewing measurements. In this study, bubbles were measured as particle counts in bench‐top laboratory experiments and at a full‐scale functioning utility. Particle counts decreased when the pressure in the measurement cell was increased during sampling, and in some cases, 46 ft (14 m) of water pressure was needed to suppress bubble formation. Failure to account for false particle counts can result in invalid conclusions about the efficacy of particle removal in water treatment. In laboratory experiments, bubbles caused spurious turbidity spikes, increasing turbidity and gas accumulation in the measurement cell of online turbidimeters. Instrument features such as electronic “bubble reject” and in‐line bubble traps can reduce the effect of bubbles on the measured turbidity, but in some cases they may aggravate the problem.
Particle count and online turbidity interference from bubble formation
Bubble formation affects particle count and online turbidity measurements, but the water industry does not routinely employ a methodology for determining when bubbles are skewing measurements. In this study, bubbles were measured as particle counts in bench‐top laboratory experiments and at a full‐scale functioning utility. Particle counts decreased when the pressure in the measurement cell was increased during sampling, and in some cases, 46 ft (14 m) of water pressure was needed to suppress bubble formation. Failure to account for false particle counts can result in invalid conclusions about the efficacy of particle removal in water treatment. In laboratory experiments, bubbles caused spurious turbidity spikes, increasing turbidity and gas accumulation in the measurement cell of online turbidimeters. Instrument features such as electronic “bubble reject” and in‐line bubble traps can reduce the effect of bubbles on the measured turbidity, but in some cases they may aggravate the problem.
Particle count and online turbidity interference from bubble formation
Scardina, Paolo (author) / Letterman, Raymond D. (author) / Edwards, Marc (author)
Journal ‐ American Water Works Association ; 98 ; 97-109
2006-07-01
13 pages
Article (Journal)
Electronic Resource
English
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