AWWA ACE59859

Particle count and on-line turbidity measurements are affected by bubble formation, and thewater industry does not routinely employ methodology that will determine when bubbles causespurious measurements. Bubbles were measured as particle counts in laboratory experimentsand at a full-scale utility, and particle counts decreased when the pressure in the measurementcell was increased during sampling. For example, if a water was supersaturated with dissolvedgas, particle counts were nearly 3 orders of magnitude higher when the sample was notpressurized, compared to the same measurement made at an applied pressure of 15 psi. Failureto account for these spurious signals can cause water treatment operators and researchers to drawfaulty conclusions about efficiency of water treatment in removing particles. In laboratoryexperiments, spurious turbidity spikes, increasing turbidity, and gas accumulation in themeasurement cell occurred in on-line turbidimeters. Includes 29 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/17/2004

Number of Pages:

19

File Size:

1 file , 480 KB