Overview
A DAF (Dissolved Air Flotation) unit is a compact clarification system used to remove fats, oils & grease (FOG) and suspended solids (TSS) from industrial wastewater. It is commonly installed as pretreatment to protect downstream biological treatment, reduce load, and improve overall plant stability.
In a DAF system, a portion of clarified water is pressurized and saturated with air. When released into the flotation tank, microbubbles attach to fine particles, oils, and flocs and lift them to the surface, where a surface skimmer removes the floated sludge. Depending on wastewater characteristics, DAF performance is typically enhanced using coagulation and flocculation (pH correction, coagulant, polymer).
Typical industries
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Slaughterhouses and meat processing
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Dairy / food & beverage
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Oil & petrochemical / refineries
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Textile and chemical industries
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Paper and pulp
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Metal finishing / galvanizing / electroplating
What PMC Engineering supplies
PMC Engineering supplies DAF units as complete packages, typically including:
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Flocculation / chemical mixing section (static mixer or pipe flocculator)
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Flotation tank with skimmer and sludge collection
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Air dissolution / recycle system (saturation assembly with recycle pump)
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Effluent weirs / launders
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Access platform and maintenance-friendly layout
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Electrical panel and automation-ready interface
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Material options such as coated carbon steel or stainless steel (SS304/SS316)
