PharmaPure DAF System for Pharmaceutical Wastewater Treatment

Dissolved air flotation description

Dissolved air flotation (DAF) is a water treatment process designed to remove oils, solids, and greases. In fact, the process helps clarify wastewaters – and other waters – by eliminating different types of suspended matter. The DAF process dissolves air in the water under pressure – then releases it at atmospheric pressure. The dissolved air flotation process takes place in a tank basin, which is ideal for catching and eliminating suspended matter. In fact, the released air creates tiny bubbles, which conform to the suspended matter and cause it to rise to the surface. Skimmers or a similar device then eradicate the substance.

Dissolved air flotation principle

Dissolved air flotation (DAF) is a solids separation process, similar to plain sedimentation. The force that drives DAF is gravity, and the force that retards the process is hydrodynamic drag. Dissolved air flotation involves the use of pressure to dissolve more air into wastewater than can be dissolved under normal atmospheric pressure and then releasing the pressure. The “dissolved” air, now in a supersaturated state, will come out of solution, or “precipitate,” in the form of tiny bubbles. As these tiny bubbles form, they become attached to solid particles within the wastewater, driven by their hydrophobic nature. When sufficient air bubbles attach to a particle to make the conglomerate (particle plus air bubbles) lighter than water (specific gravity less than 1.0), the particle will be carried to the water surface.

Dissolved air flotation technical sheet

Dissolved air flotation process flow

Dissolved air flotation advantage

Improved Water Quality
Greater turbidity reduction
Discharge compliance
Greater treatment flexibility
Reduced chemical consumption
Operational Advantages
Small footprint
Zero backwash
Improved product quality
Simple and easy operation
Reduced downtime and operational cost

Dissolved air flotation feature

The environmental impact of DAF systems is generally positive, particularly in minimizing water pollution. By enabling the removal of over 90% of harmful components from industrial effluents, DAF systems contribute to cleaner water bodies and reduced environmental pollution. Moreover, reduced chemical usage and advancements in energy-efficient designs further enhance the sustainability of DAF technology.

Dissolved air flotation application

Industrial Wastewater Treatment
In an industrial setting, the main challenge often revolves around the presence of suspended solids, oils, and greases in the wastewater. Imagine a large-scale manufacturing plant dealing with significant amounts of these pollutants. By implementing a Dissolved Air Flotation (DAF) system, the plant was able to achieve an impressive reduction in Total Suspended Solids (TSS) and Chemical Oxygen Demand (COD), leading to a cleaner effluent, which met regulatory standards and reduced environmental impact.
Municipal Wastewater Application
Municipalities face the mammoth task of treating vast volumes of wastewater from households and businesses. In one city, DAF units were employed as a pre-treatment step before biological treatment. This approach allowed the city to handle variations in influent quality more effectively. The result? Enhanced performance of secondary treatment processes, reduced sludge volumes, and improved overall plant efficiency. Residents benefited from cleaner water and reduced operational costs for the municipality.
Sludge Thickening in a Food Processing Plant
Food processing plants generate high levels of organic waste and sludge. In one such facility, a DAF system was installed specifically for sludge thickening. By removing excess biological sludge efficiently, the plant managed to significantly reduce the volume of sludge that required further treatment. This not only lowered disposal costs but also enabled the recovery of water for reuse within the plant, promoting sustainability.
Pretreatment for downstream biological treatment systems

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• Company: Wuxi Dajiang Environmental Technology Co., Ltd.  DAGYEE
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• Email: info@dagyee.com
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