DAF (Dissolved Air Flotation) operates on the principal of the transfer of floc to the surface of water through attachment of air bubbles to the floc. The floc accumulated on the surface, known as the 'float', is skimmed off as sludge. The clarified water is removed from the bottom and is sometimes called the subnatant or 'floated' water.
Since environmental factors like rain, snow, or freezing could affect the process, flotation tanks are typically enclosed. This process is particularly suited to treatment of eutrophic, stored lowland or algae-laden waters and soft, low alkalinity colored waters. Performance depends on the effectiveness of coagulation and flocculation, with polyelectrolyte dosing often used to ensure stability in low temperatures.
| Model | QK-DAF10 | QK-DAF25 | QK-DAF50 | QK-DAF80 |
| Capacity (m3/h) | 10 | 25 | 50 | 80 |
| Dimensions (mm) | 4000*2000*2250 | 6000*2500*2250 | 8000*2800*2250 | 9000*3000*2250 |
| Return Pump (kw) | 4 | 5.5 | 7.5 | 11 |
| Scraping Motor (kw) | 0.37 | 0.37 | 0.55 | 0.75 |
| Air Compressor (kw) | 1.5 | 1.5 | 2.2 | 3 |
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