This paper describes the results of a pilot-scale Actiflo® waste treatment investigation conducted
at the City of Calgary's Glenmore Water Treatment Plant (WTP) from April to June 2003. In
addition to Actiflo pilot testing, a pilot-scale clarifier-thickener was used to evaluate sludge
thickening. The clarifier-thickener consisted of a flocculation tank followed by an integrated tube
settler unit located above a gravity sludge thickener. Performance of the clarifier-thickener was
excellent. At a surface loading rate of 5.6 m/h, solids content in the thickened sludge ranged from
1% with no polymer addition to 9% with the addition of 0.5 mg/L of anionic polymer. Thickener
supernatant ranged from 1-4 NTU, depending on polymer dose.
The dewaterability of the thickened sludge was also examined as part of this study. Sludge from
the clarifier-thickener was sent offsite for bench-scale centrifuge and plate filter press tests.
Dewatered cake solids ranged from 20-40% from the centrifuge tests, using an anionic polymer
with the centrifuge. It was found that the ease of dewatering was affected by the polymer dose
added in the thickener-clarifier. In some instances, excessive polymer doses in the thickener-clarifier
resulted in poor sludge dewaterability, and low final solids content. Bench-scale plate filter
press tests resulted in dewatered cake solids in the range of 20-40%. Best results with the filter
press were seen with the addition of lime and polymer to the thickened sludge. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 380 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 06/17/2004 |
