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Sand filtration Sand filtration 400 m3/h

Total flow of clarified water through PF 1 – 5 or PF 6 – 9 is 400 m³/h.
Filter diameter: 3,000 mm
Filter media - type PR 1 – 1.6
- Grain size: 1 – 1.6 mm
- Bed height: 1,100 mm
Operation:
Maximum filter capacity: 100 m³/h
Filtration rate: 14.3 m/h
Backwashing:
Backwash water flow: 70 m³/h
Upflow velocity: 10 m/h
Backwash air flow: 385 Nm³/h
The PF units are divided into two sections: PF1-5 (old installation) and PF6-9 (new installation). Only one section operates at a time according to operational requirements. The overall workload is approximately balanced, so each section runs about 4,400 hours annually. The sand filters are regularly backwashed after each operational cycle (80 hours) or when the pressure loss reaches ΔP 25 kPa. The system is fully operational.
PF Reconstruction:
PF1-5: 10.11.2015 – complete replacement of sand, nozzles, and shell surface maintenance
PF6-9: 13.7.2018 – complete replacement of sand, nozzles, and shell surface maintenance.
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