III. Water Treatment Topic III. 4 III. Water Treatment Topic III.4. Upflow Sludge Blanket Clarifiers: Processes and Facilities Processes: I. Particularities Applying of contact coagulation Flocullation chamber don’t needed II. Advantages Higher rate of coagulation Deeper process of coagulation Less coagulant quantity needed Negligible temperature impact III. Disadvantages More sludge production Not applicable for SS > 2500 mg/l

Upflow Sludge Blanket Clarifying Processes Basic Parameters Suspended solids Upflow velocity Distribution coefficient mg/l mm/s - < 50 1,5 - 1,6 0,95 50 - 100 1,6 - 1,8 0,90 100 -500 1,8 - 2,0 0,85 500 - 1000 2,0 - 2,2 0,75 1000 - 2000 2,2 - 2,5 0,70

Upflow Sludge Blanket Clarifiers Corridor Type 1 - perforated coarse water distribution pipes 2 - sludge blanket 3 - sludge overflow orifices 4 - sludge thickening zone 5 - water clarifying zone 6 - channels for clarified water 7 - collector for clarified water 8 - sludge withdrawing pipes

Upflow Sludge Blanket Clarifiers Circular Type 1 - inflow channel; 2 - air release chamber; 3 - inlet water pipes; 4 - perforated water distribution pipes; 5 - protecting shields; 6 - sludge blanket; 7 - lamellas; 8 - water clarifying zone; 9 - perforated outlet pipes for clarified water; 10 - collecting channel