Particle count and on-line turbidity measurements are affected by bubble formation, and the
water industry does not routinely employ methodology that will determine when bubbles cause
spurious measurements. Bubbles were measured as particle counts in laboratory experiments
and at a full-scale utility, and particle counts decreased when the pressure in the measurement
cell was increased during sampling. For example, if a water was supersaturated with dissolved
gas, particle counts were nearly 3 orders of magnitude higher when the sample was not
pressurized, compared to the same measurement made at an applied pressure of 15 psi. Failure
to account for these spurious signals can cause water treatment operators and researchers to draw
faulty conclusions about efficiency of water treatment in removing particles. In laboratory
experiments, spurious turbidity spikes, increasing turbidity, and gas accumulation in the
measurement cell occurred in on-line turbidimeters. Includes 29 references, table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 480 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 19 |
| Published : | 06/17/2004 |
