The dissolved air flotation (DAF) sedimentation machine is a water treatment device integrating DAF and sedimentation technologies, primarily used to remove suspended solids, oils, and colloidal pollutants from wastewater. The following is a detailed introduction:

Product Detail

I. Product Introduction

II. Working Principle

DAF Process: The dissolved air system dissolves air in water to form saturated dissolved air water. A large number of microbubbles are released through a depressurization device. These microbubbles adhere to the surface of suspended solids, reducing their density and causing them to float to the surface, forming a scum layer, which is then removed by a scraper.

Sedimentation Process: Solids not removed by DAF settle to the bottom of the sedimentation zone under gravity and are discharged through a sludge hopper or scraper. Inclined tube/plate structures shorten the settling path and improve sedimentation efficiency.

III. Equipment Structure

Inlet Pipe: Mostly made of acid- and alkali-resistant, corrosion-resistant 304 stainless steel or UPVC, equipped with an electromagnetic flow meter for real-time monitoring of the inlet flow rate.

Reaction Zone: Equipped with a mechanical agitator, this zone rapidly and evenly mixes flocculants and coagulants into the wastewater, causing suspended particles to aggregate into large flocs.

Dissolved Air Tank: Air is injected via an air compressor, dissolving a large amount of air into the water at a pressure of 0.3-0.5 MPa.

Release Device: Instantly depressurizes the dissolved air water, releasing dense microbubbles.

Scum Scraper: Located on the surface of the flotation tank, it operates at a constant linear velocity, promptly scraping scum into the sludge tank.

Sedimentation Zone: Typically employs inclined tube or inclined plate sedimentation technology. The funnel-shaped sludge hopper at the bottom facilitates the automatic sliding of settled sludge, which is periodically removed by a sludge pump.

Effluent Weir: Designed based on the principle of communicating vessels, this ensures a constant effluent water level and smooth water flow.

IV. Equipment Advantages

High Treatment Efficiency: It can quickly remove various pollutants from wastewater, and also has a good removal effect on fine particles, colloids, and greases that are difficult to treat using traditional sedimentation methods. The entire flocculation reaction and solid-liquid separation process typically takes only about 3 minutes. Small footprint: Its compact structure occupies only about 1/10 the space of traditional biochemical processes, making it suitable for spaces with limited capacity.

Low energy consumption: Key components employ high-efficiency energy-saving designs, with a high degree of automation. Operating parameters can be automatically adjusted according to changes in wastewater quality and quantity, avoiding energy waste.

Good environmental performance: The treatment process does not generate secondary pollution problems such as odors. It has significant removal effects on pollutants such as COD, BOD, suspended solids, and oils, and the effluent generally meets discharge standards.

V. Application Areas

Industrial wastewater treatment: Widely used in chemical, pharmaceutical, food processing, printing and dyeing, and papermaking industries, it can effectively remove suspended solids, grease, colloids, and other pollutants from wastewater.

Municipal wastewater treatment: It can be used as a pretreatment unit or advanced treatment unit in urban wastewater treatment plants, improving the overall treatment efficiency and water purification effect of wastewater treatment plants.

Other areas: It can also be applied to groundwater iron and manganese removal, industrial water pretreatment, and drinking water purification.

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