DAF Clarifier
Brij Enviro’s Dissolved Air Flotation (DAF) clarifier features a uniquely engineered effluent collection system that delivers operating rates far superior to conventional flotation technologies. This advanced design increases the capacity of both existing and new treatment facilities while minimizing space requirements. DAF is particularly effective in clarifying water with high levels of algae and other low-density solids, which are difficult to remove efficiently through sedimentation. By integrating conventional DAF principles with several enhanced components—such as the unique effluent collection system—Brij Enviro ensures optimal hydraulics within the flotation zone. These innovations result in superior surface loading rates and significantly reduce Total Suspended Solids (TSS), oil, and floating materials or particles.
Features
- Compact footprint - minimum 5 to 20 mins. retention.
- MOC of DAF, Milds Steel, Caron Steel, Stainless Steel etc.
- Start-up & shutdown within short time/period
- Pretreatment technology - reduce floating impurities
- Hydraulic or mechanical sludge removal options
- Easy to Operate
How it Works ?
- Raw water inlet: Coagulated water from an in-line rapid mixer enters a flow distribution channel prior to the flocculation zone. Coagulation is the destabilization of colloidal particles, which facilitates their aggregation and is achieved by the injection of a coagulant, such as alum or ferric chloride.
- Flocculation zone: Coagulated water is equally split to each unit, with traditional 2-stage tapered energy flocculation with variable frequency mixers. In this step, the destabilized particles agglomerate and form larger floc particles. The High Rate DAF flotation process requires only the formation of light, pinpoint particles, eliminating or significantly reducing the need for flocculant polymers. Additionally, the retention time employed in this stage is generally less then 15 minutes.
- Air-water dispersion zone: Flocculated water is then transitioned to the base of the flotation zone, where it passes through the injection of a saturated air-water recycle stream. This recycle stream is produced by recycling. The recycle stream is then depressurized through a series of release nozzles, which are submerged and span the entire width of this transition zone. This depressurization creates thousands of micro bubbles, which disperse into the flotation zone.
- Flotation zone: The principle behind the flotation process is the micro-bubbles which will form a dense air blanket within the flotation zone with the help of Air Dissolving Tube. The flocculated particulate will agglomerate with the micro-bubbles, as they rise to the surface, subsequently clarifying the water.
- Sludge accumulation: The floated solids accumulate on the surface of the High Rate DAF resulting in a thick sludge layer. Sludge may be removed with one of two methods:
− Hydraulically, whereby an automatic effluent weir rises in a prescribed time. Subsequently, the flotation zone water level rises and the sludge is removed to an integral sludge trough.
− Mechanically, whereby a traveling bridge scraper mechanism will penetrate and scrape the solids layer into the integral sludge trough. - Collection: Clarified water is collected uniformly across a perforated collection floor. This uniquely engineered system, in combination with other process enhancements, creates resistance over the flotation zone, resulting in uniform collection and efficient hydraulics throughout the basin.
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