DAF — Dissolved Air Flotation

Dissolved Air Flotation (DAF) is a water treatment process that clarifies wastewaters (or other waters) by the removal of suspended matter such as oil or solids.

The removal is achieved by dissolving air in the water or wastewater under pressure and then releasing the air at atmospheric pressure in a flotation tank basin.

The released air forms tiny bubbles which adhere to the suspended matter causing the suspended matter to float to the surface of the water where this layer of sludge is removed by a skimming device. Flocculants and coagulants are often added to improve the performance of the unit.

Dissolved Air Flotation performance depends on the air to solids ratio, and this will vary with different types of suspension as the flotation process is dependent on the surface area of the materials.

What We Monitor.

3787_RS_IllustrationsForWeb - DAF

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Energy

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Operations

Higher Quality
Lower Waste

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Maintenance

Avoid breakdowns

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Sustainability

Reduce emissions

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Monitoring.

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Energy

Consumption data continuously collected from:

  • Drives - Scraper, Pumps & Compressors
  • Process control

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Operations

Capture key operating data directly from process control systems:

  • Pumps: Flow rates
  • Compressors: Pressures
  • Water Quality: pH, Turbidity, Dissolved Oxygen (DO) & Total Suspended Solids (TSS)

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Maintenance

Monitor leading indicators of failure:

  • Current & Torque: Drive & pump loading
  • Vibration: Cavitation, lubrication failure, bearing wear and asset movement & stability
  • Chemical Concentration: reduce chemical corrosion through better dilution control

Indicative Savings.

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Energy

Quantify the energy costs of:

  • Pumps
  • Compressors
  • Flocculators and augers

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Operations

Optimise chemical usage for coagulants and other agents

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Maintenance

Control chemical compositions to reduce corrosion

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