This powerpoint presentation begins by presenting the study focus on floc size that includes the following:
granular filtration performance is a
function of the influent particle size
distribution;
potential to be used on-line -
Dynamic Particle Analyzer (PDA) from
Brightwell Technologies, and -
Photometric Dispersion Analyzer (PDA) from
Rank Brothers; and,
Drewes et al. have recently suggested that
the average floc size (dn) was a useful
parameter when charge neutralization
coagulation conditions prevailed. The Photometric Dispersion Analyzer and the Dynamic Particle Analyzer 2100 are presented as analytical tools. Study objective was to evaluate to what extent direct filtration performance
could be linked to the floc size or the flocculation index. Experimental desgin and set-up, and water characteristics are provided. Presentation conclusions indicated the following: the parameter, d<sub>v</sub>, was the best indicator found to
describe flocculation from the particle counter PSD;
this indicator was more sensitive and less variable
than the Flocculation Index provided by the PDA;
establishing a direct link between d<sub>v</sub> and filtered
water turbidity was not a simple task, although it
was observed that increasing d<sub>v</sub> to values higher
than 25 um generally led to lower filtered water
turbidities;
the addition of polymer significantly reduced the
importance of flocculation, although its impact was
minor on d<sub>v</sub>; another characteristic than size was
most likely impacted by the polymer; PASS100 in combination with polyDADMAC
was selected as the best coagulation
strategy;
this strategy was confirmed to be optimal
using an industrial pilot plant (50 m<sup>3</sup>/d); and,
combining pre-ozonation and flocculation
into a single process is currently under
investigation. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 23 |
| Published : | 11/01/2008 |
