dissolved air flotation energy-saving air flotation

dissolved air flotation
Our Dissolved Air Flotation(DAF)systems provide high-quality,efficient clarification of suspended particles from wastewater

We have been developing and continually improving dissolved Air Flotation(DAF)systems,and has successfully implemented installations in a variety of applications.
DAF is a wastewater clarification process for the separation of solids,grease,and oils.The system helps concentrate Sludge,removes a wide range of suspended solids(fats,oil,and grease)in wastewater and reduces COD and BOD.
DAF works by producing a stream of microfine bubbles that attach to solids and lift them to the surface,where they can be removed by a surface scraping mechanism.
Our dissolved air flotation solutions provide high-quality,high-capacity,and efficient clarification.
Extensive Applications
DAF systems can be applied as a pretreatment to meet a municipality’s specific limits for oil,grease,or suspended solids,or to remove contaminants that would negatively impact an industrial biological wastewater treatment system downstream.They also can be used to thicken already separated sludge(chemical,physical or biological),and generally allow for an increase in the concentration of sludge from 1%to 8-10%.
DAF technology is ideally suited to neutral-density particles and those that are buoyant or settle slowly.This is particularly relevant to the food industry and other businesses that produce light,high-volume solids that are resistant to settling.DAF also takes up about 25%of the equivalent surface area compared to conventional clarification technologies.
DAF is a proven, robust,and effective physical-chemical technology commonly used for many industrial and municipal applications,including:
Product recovery and reuse
Pretreatment to meet sewer discharge limits
Pretreatment to reduce loading on downstream biological systems
Polishing of biological treatment effluent
Removing silt and grease from industrial water
DAF is used extensively in the following industries:
Meat,poultry,and fish processing
Dairy industry
Petrochemicals
Pulp and paper
Food and beverage
How Dissolved Air Flotation Works

The flotation process is based on coagulation and flocculation mechanisms.By adding specific chemicals,such as iron chloride and aluminum chloride,colloidal particles are destabilized and floc formation takes place.Flocculation with other chemicals, such as polyelectrolyte,facilitates the collision between the destabilized suspended and colloidal particles to form larger clots that can be readily removed.The process separates solid particles from the liquid.At first water is saturated with dissolved air under pressure.This recycle stream(pressurized from 4to 6bar),called the hypersaturated stream, is then mixed with the incoming wastewater in an internal contact chamber,where the microscopic air bubbles attach to solids and float them to the surface,forming a floating sludge bed.
A scraping assembly skims the sludge from the surface of the water and into a sump,from where it's pumped to sludge treatment.The treated water is then discharged or undergoes other treatment processes.
Solution Architecture
The flotator is made of AISI 304stainless steel and equipped with a flocculate accumulation basin.The flocculate scraper is composed of a driveshaft with two gears at its extremities;a secondary shaft,also with two gears;two transmission chains that transmit the motion from the driveshaft to the secondary shaft;and four rubber scraper blades on the two chains.
The hypersaturation system is composed of a centrifugal multi-impeller pump equipped with valves and a delivery pipeline. The reserve unit will be supplied but not assembled.The pumps’electric motors are not included.
An air-injection device in the pump body
Key DAF Features
Total suspended solids(TSS)reduction up to 97%
Chemical oxygen demand(COD)removal up to 85%
Low-cost operation and maintenance
Standard and customized units meet a variety of application and flow ranges
Designed for ease of installation and use
Suitable for high-salinity water
Models
Our produces lines of DAF units for both processing wastewater and thickening digestate. The compact units range in capacity from up to 30m³/h to 130m³/h for wastewater treatment,and from up to 5m³/h to 20m³/h for digestate thickening.
WASTEWATER

Sewage Treatment Equipment

Rotary drumfilter