Overview
The CG DAF™ Flat Flow system is a rectangular dissolved air flotation unit engineered with flat-flow hydraulics to provide uniform distribution of feed water and micro-bubbles across the entire flotation zone. Unlike DAF systems where hydraulic short-circuiting leads to inconsistent performance, the flat-flow configuration ensures uniform hydraulic loading across the full tank cross-section — maximising contact time and pollutant capture. Particularly effective for food and beverage, dairy, fish processing, and other applications where stable, consistent FOG and SS removal is critical for downstream biological performance.
Working Principle
Chemically conditioned feed water enters through a submerged baffle inlet distributing flow uniformly across the full tank width. Recycle water saturated with dissolved air at 4–6 bar is released through ceramic nozzles distributed uniformly across the inlet width, generating fine micro-bubbles throughout the flotation zone. The flat-flow hydraulic pattern carries floc-bubble complexes horizontally, providing long contact time. A variable-speed surface skimmer continuously removes the floating sludge blanket. Heavy settled solids discharge through bottom drain valves.
Key Technical Features
- Flat-flow design — eliminates hydraulic short-circuiting
- Uniform micro-bubble distribution across full tank width
- FOG removal: >92%, SS removal: >88%
- Integrated coagulation/flocculation chamber
- Variable speed skimmer — adjustable sludge blanket thickness
- Ceramic nozzles on pressure dissolving tank
- SS304 or epoxy MS construction
- Recycle ratio: 15–30% adjustable
- PLC control with automatic recycle adjustment
Design Parameters
| Parameter | Value |
|---|---|
| Flow Range | 100–3,000 m³/day |
| FOG Removal | >92% |
| TSS Removal | >88% |
| Recycle Ratio | 15–30% |
| Operating Pressure | 4–6 bar |
| HRT | 15–30 min |
Applications
- Dairy processing wastewater
- Fish and seafood processing
- Meat and slaughterhouse effluent
- Beverage industry
- Food manufacturing
- Edible oil refinery pre-treatment
Advantages
- Consistent performance across full design flow range
- No short-circuiting — all water receives same treatment
- Uniform float sludge for easier dewatering
- Modular design — adaptable to existing site layouts
- Stainless steel for food-grade applications
Frequently Asked Questions
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