High efficiency energy saving combined air flotation

dissolved air flotation(DAF)System
DAF(Dissolved Air Flotation)systems are versatile and efficient chemical precipitation and physical separation systems designed to clarify wastewater for subsequent treatment and reuse.The equipment separates total suspended solids(TSS),biochemical oxygen demand(BOD),fats and oils from the water.
The high concentration of Sludge produced is removed to the internal hopper(sludge hopper)for further treatment via a surface skimmer.The treated wastewater is continuously discharged at multiple points within the DAF system and discharged to the effluent chamber via a piping weir.

What is Dissolved Air Flotation(DAF)?
Dissolved air flotation(DAF)is a water clarification process that uses air to remove suspended material from the surface of treated water.DAF works by dissolving air under pressure and then releasing millions of tiny air bubbles into the water at atmospheric pressure.This process allows the dissolved air bubbles to attach to the suspended matter in the water,causing it to float to the surface and be skimmed off.Coagulants/flocculants are added to the process to induce aggregation of suspended solids and colloidal particles.
DAF systems are commonly used to clarify wastewater from food processing plants,oil refineries,oil and gas operations,pharmaceutical plants,chemical plants,paper mills and municipal water plants,among others.
Features
The dissolved air pump absorbs water while inhaling,pressurized and mixed in the pump,high gas-liquid dissolution efficiency,and fine air bubbles s30um.
The dissolved air pump can replace the complex system composed of circulating pump,air compressor,dissolved air tank,ejector and release head.
Low pressure operation,the dissolved gas efficiency is as high as 99%,and the release rate is as high as 99%.
The efficient adsorption of microbubbles and suspended particles improves the removal effect of SS.
The dissolution efficiency of dissolved air and water is 80-100%,which is 3times higher than that of traditional dissolved air flotation.
The pressure-capacity curve is flat,easy to realize automatic control,easy to operate,easy to maintain,and low noise.
Main advantages
Versus conventional clarification—higher sludge solids,smaller footprint,and more reliable effluent quality
Reduced footprint—compared to any comparable system with similar flow rates/load levels
High Efficiency—Utilizes angled settling tubes for increased surface area and faster separation.
Air flushing—for automatic pipe cleaning.
Premium Treated Water—for the most efficient separation of sludge from effluent.This also allows decanting of more free water prior to sludge removal.Increases reuse rates while reducing compliance costs.
Sludge grating/thickening—prevents sludge migration and thickens it for improved reuse.
Process description
The dissolved air flotation system integrates water inlet,flocculation,separation,water collection,and water effluent,which is similar to traditional air flotation equipment.It is equipped with a steady flow chamber and a dissolved gas release chamber,which makes the treatment performance more stable and the effect is better.
Stabilization chamber:The raw water reacted by the folded plate has a high flow rate.If it directly contacts with the dissolved air,it will dissipate tiny bubbles,which will affect the effect of the bubbles adhering to the floc,thereby reducing the efficiency of air flotation treatment.The kinetic energy of the turbulent raw water is consumed and enters the dissolved gas water release chamber at a uniform speed,thus effectively ensuring the removal effect.
Dissolved gas release chamber:The dissolved gas release chamber and the separation chamber are in one tank.Separated in the middle,the dissolved air water and the flocculated raw water adhere here,slowly rise,and enter the air flotation separation chamber,which ensures the contact space and time between the flocculation block and the tiny bubbles,and makes the release rate of the dissolved air water reach 80-100%.
DAF system design
Designing the best DAF system for your application requires site visits,testing and pilot studies to determine the real needs of the plant.A typical DAF system includes coarse filtration,physicochemical treatment,and dewatering of the sludge prior to discharge or reuse.Coarse filtration removes lint,scale,sand and other large objects from the waste stream via hydrocyclones or vibrating screens.A hydrocyclone system is a centrifugal separation device designed to separate high density solids,such as grit,from the waste stream.A vibrating screen is a multi-stage Filter that accommodates different flow rates and separates fine and coarse particles.Both are used prior to the DAF.
Accurate pH control is critical for any wastewater treatment system.Discharge pH limits vary from region to region and the consequences of discharging beyond these limits are often fines and environmental damage.Automatic addition of acid or caustic soda is preferred in pH control,which consists of a treatment tank with a mixer,an in-tank pH sensor,in-tank level control,metering pumps for acid and caustic soda injection,an automatic drain valve or pump comprising the effluent and a control panel.
After the wastewater stream passes through rough filtration,pH control and the DAF,the sludge generated from the DAF is skimmed off and moved to sludge dewatering.A filter press or screw press can dewater the liquid waste residue for final disposal of the dry solid waste.This solid waste can be disposed of separately to a landfill,resulting in a cleaner wastewater discharge.Sludge dewatering equipment greatly reduces waste treatment and disposal transportation costs.
FYY is a manufacturer and supplier of DAF dissolved air flotation system in China,supplying types of daf system products at factory prices.Contact us for a quote on the right dissolved air flotation unit for your site application.
Industry applications
Papermaking wastewater treatment and fiber recycling
Paint wastewater treatment
Printing and dyeing wastewater treatment
Food waste water treatment
Electroplating waste water
Separation of biologically treated mud and water
Heavy metal ions
Low temperature and low turbidity surface water treatment
Oily wastewater treatment
Algae-containing surface water treatment
Tannery wastewater treatment
Chemical wastewater treatment
Field case

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