What does DAF mean in water treatment?
Dissolved air flotation
​Dissolved air flotation (DAF) is a proven and effective physical/chemical technology for treating a variety of industrial and municipal process and wastewater streams.
How does a DAF system work?
Dissolved air flotation, the most common approach, works by attaching small bubbles of air to suspended solids. The bubbles are generated by saturating a recycled stream of water with air under pressure, then releasing the pressure rapidly to produce clouds of microbubbles.
What is DAF in RO plant?
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. A very similar process known as induced gas flotation is also used for wastewater treatment.
How does a wastewater DAF work?
DAF systems work by dissolving air into the wastewater. This creates thousands of micro-bubbles, and aerates the wastewater. This process floats and thickens the suspended material in the wastewater. The solids are then segregated for recovery or disposal.
What does a DAF remove?
DAF systems are designed to remove total suspended solids (TSS), biochemical oxygen demand (BOD), and oils and greases (O&G) from a wastewater stream. Contaminants are removed using a dissolved air-in-water solution produced by injecting air under pressure into a recycle stream of clarified DAF effluent.
Is DAF biological treatment?
Dissolved air flotation (DAF) is a relatively common wastewater treatment technology that has been used for everything from biological solids thickening at POTWs to providing primary clarification for surface water treatment to removing suspended solids (TSS) and oil and grease (O&G) from industrial wastewater.
What is DAF unit?
Dissolved air flotation (DAF) is one of the most versatile and effective process in water, wastewater treatment and desalination. In several ocassions, dissolved air flotation system is installed at the beginning of the water treatment process, immediately after the pretreatment to remove fat and grease.
What is DAF equipment?
DAF systems are equipment for the separation of solid particles, fats, and oils, designed to clarify wastewater (industrial and urban) or condition surface or marine water for its subsequent treatment and reuse. This equipment separates solids, fats, and oils in the water generating highly concentrated sludge.
How do you clean a DAF?
Clean water is necessary because DAF systems pressurize the water and mix it with pressurized air. Under pressure, the air dissolves, and when de-pressured, micro-bubbles form. The micro-bubbles are necessary to the cleaning process. So, the first step is to fill the DAF system with clean water.
Does DAF remove bod?
DAF systems are designed to remove total suspended solids (TSS), biochemical oxygen demand (BOD), and oils and greases (O&G) from a wastewater stream.
What can a DAF remove?
STANDARD PROCESS. The DAF separates the suspended solids and lighter liquid contaminants (eg FOG and hydrocarbons) from the water by moving them to the surface of the DAF vessel and then scraping them off the surface.