Fully automated systems with PLC control, level sensors, and variable speed drives for optimal performance and minimal operator intervention.
Free interactive DAF sizing calculator. Calculate dissolved air flotation surface area, recycle flow, saturator volume, and power.
FOG removal food industry DAF systems for fat oil grease recovery food processing.
DAF systems for oil and gas produced water and refinery wastewater treatment.
Design DAF systems for correct hydraulic loading. Surface area, rise rate and detention time calculations for your flow.
Programmable Logic Controllers manage all system functions with reliable, industrial-grade automation.
Continuous level monitoring ensures optimal tank operation and prevents overflow or dry running.
VSDs on pumps and motors optimise energy consumption based on actual process demands.
Touch-screen Human-Machine Interface provides intuitive control and real-time system monitoring.
Minimal operator intervention required, freeing staff for other tasks.
Variable speed drives adjust power consumption to match actual demand.
Automated control maintains optimal operating parameters 24/7.
Automatic alerts notify operators of any issues requiring attention.
Dissolved Air Flotation is a physico-chemical separation process that removes suspended solids, oils, greases, and colloidal matter from wastewater. Pressurised water saturated with air is released into the flotation zone, generating microbubbles that attach to flocculated particles and float them to the surface as a concentrated sludge blanket. The clarified water exits below the floating sludge layer.
Recycle stream pressurised to 4-6 bar in a saturation vessel with optimised retention time.
Pressure release through proprietary nozzles generates 20-80 µm bubbles with high attachment efficiency.
Rising velocity of bubble-particle agglomerates exceeds settling velocity, forcing separation.
Mechanical scrapers or hydraulic suction systems continuously remove concentrated float.
| Hydraulic Loading | 5 – 15 m³/m²/h |
| Solids Loading | Up to 15 kg SS/m²/h |
| Air-to-Solids Ratio | 0.02 – 0.1 kg air/kg SS |
| Recycle Ratio | 10 – 50% of influent flow |
| Flotation Zone Depth | 1.5 – 3.0 metres |
| Retention Time | 10 – 30 minutes |
| Drive Power | 0.37 – 2.2 kW (scraper mechanism) |
| Construction | SS304, SS316L, or carbon steel with epoxy coating |
95 – 99% suspended solids reduction depending on flocculant selection and upstream conditioning.
>98% oil and grease removal for emulsified and free-floating hydrocarbons.
40 – 70% COD removal depending on solids fraction and coagulant optimisation.
Complete dissolved air flotation systems for industrial and municipal applications.
View PageModern DAF skids run with minimal operator intervention through a layered control architecture.
Siemens S7-1500 or Allen-Bradley CompactLogix. Scan cycle 100–200 ms. Handles recycle pump VFD, scraper VSD, dosing pump pacing, sludge withdrawal sequencing.
Flow-paced with feedback trim from inlet turbidity sensor. Cascade architecture: bulk feed-forward from flow + PID trim from turbidity offers stable dose across 10:1 flow turndown.
Timer-based purge of bottom sludge, level-based of float sludge. Sludge density sensor (ultrasonic) controls valve opening duration to maintain target solids in downstream dewatering.
VFD on recycle pump modulates pressure (and therefore A/S ratio) in response to inlet TSS sensor. Saves 15–25% energy vs fixed-speed operation.
Two-tier alarms: pre-warning (e.g. outlet turbidity > 80% of consent) and trip. Plant ESD on Cat A: pump failure, level high-high, gas detection.
OPC UA upward connection to plant SCADA. Trending of A/S, recycle ratio, outlet turbidity, scraper torque. Industry 4.0 dashboard for fleet operators.
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Our expertise spans multiple industries with sector-specific water treatment solutions.