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Case Study 3
Pulp and Paper Mill with Screw Press / Rotary Screen Thickener
Bleached Kraft
(1000 adt/d) and TMP mill, (1400 adt/d)
UNOX activated sludge treatment, with primary and secondary clarification.
| Design flow: |
50 MGD (230 MLD) |
| Sludge Production: | 89 t/day |
Application
| Equipment: |
FKC screw press with rotary screen thickener |
| Old Mixer: | Static mixer with throttling valve |
| New mixer: | 6” OPTIFLOCTM |
| Flow: | 130 IGPM (10 L/s) |
| Sludge type: | Combined primary and
secondary Sludge |
| Composition: | 73% primary 27% secondary |
| Conditioner: | Diachem amine based
coagulant Diachem cationic emulsion flocculant |
RST
and Screw Press Performance
| Static Mixer | Optifloc | Improvement | |
| |
|
|
|
| Feed TS (%) | 2.5 | 2.8 | |
| RST Discharge(%TS) | 3.4 | 4.9 | 44% |
| Cake TS (%) | 30.5 | 39.2 | 29% |
| Pressate TSS(mg/L) | 1290 | 820 | 36% |
| Floc.Dosage(kg/t) | 9.1 | 5.0 | 45% |
Copyright
2003 Optifloc Systems