In the water treatment process, solid-liquid separation and its equipment are one of the key projects. Dissolved air flotation is one of the most effective methods whose specific gravity is close to 1.0 from water.
二、Type and Its Indication
GF - □T —— treatment capacity（m3/h）
※small footprint, lower energy consumption;easy operation and simple management
※high efficiency of dissolved air, stabletreatment effects. Electro-mechanic instruments are integrally controlled.
※This equipment is equipped with GFAdissolved air system which has ingenious structure. And its dissolved airefficiency reaches up to 90% . But its volume is only one fifth of the ordinarydissolved air system. Moreover, it has stronger anti-clogging capability thanother DAF.
※This equipment uses new type dissolved airreleaser with the advantages of high releasing degree and self-cleaningfunctions. And the average particle size of micro bubbles is about 15~30μm.
※This equipment uses chain-plate-typeskimmer with advantages of stable operation and high efficiency of scraping.
四、Structures and its working processes
GF Type combined DAF consists of flotation tank, dissolved air system, reflux pipe, dissolved air released system, skimmer(Based on customer needs, there are combined type, traveling type and chain-plate type to choose. ), electric cabinet and so on.
Air flotation separation technology dissolves air into water at certain working pressure . In the process, pressurized water is saturated with dissolved air and is discharged into a flotation vessel. The microscopic air bubbles produced by released air attach to suspended solids and float them to the surface, forming a sludge blanket. A scoop removes the thickened sludge. Finally, it complete purifies the water.
Air flotation technology plays an important in solid-liquid separation. (simultaneously reduce COD,BOD,chroma,etc ). Firstly, mix flocculating agent into raw water and stir thoroughly. After the effective retention time (lab determines the time, dosage and flocculation effect), the raw water enters into the contact zone where microscopic air bubbles adhere to the floc and then flows into the separation zone. Under the buoyancy effects, the tiny bubbles float the flocs to the surface, forming a sludge blanket. A skimming device removes the sludge into the sludge hopper. Then the lower clarified water flows into the clean-water reservoir through the collecting pipe. Some of water are recycled to the flotation tank for the air dissolving system, while others will be discharged.
Note: Technical data see Table 1
Outside drawing see Table 1 and Table 2
Overall dimension see Table 2 and Table 3
As a waste water process, DAF is widely used in sewage treatment and water purification engineering. This equipment is suitable for:
※increase effluent recycling and fresh water reusing in paper and pulp
※removal of heavy metal ions
※separation of oil refinery effluent
※removal of tannery wastewater
※removal of chromaticity and impurities in printing and dyeing wastewater
※solid-liquid separation of sewage and membrane after all kinds of bio-treatment
※Sludge concentration (capacity: 20%-30%, except the dedicated device which can be designed according to the requirements)