As a DAF wastewater treatment supplier, Qingdao Jinwantong provides dissolved air flotation equipment for projects that need efficient removal of oil, grease, suspended solids and floating contaminants. DAF, or dissolved air flotation, is a physical-chemical wastewater treatment process widely used in industrial effluent treatment and pretreatment systems.
The basic principle of DAF is simple. Air is dissolved into water under pressure and then released into the flotation tank. When the pressure drops, millions of fine bubbles are generated. These bubbles attach to suspended solids, oil droplets and flocculated particles, making them rise to the water surface. A scraper then removes the floating sludge, while clarified water flows out for further treatment or discharge.
A typical DAF wastewater treatment system may include a flotation tank, dissolved air system, reflux pump, air compressor, release device, scraper mechanism, sludge collection system, control cabinet and chemical dosing system. In many projects, DAF is used together with coagulants and flocculants to improve separation efficiency. For oily wastewater or industrial effluent with high suspended solids, pretreatment such as screening, equalization or CPI oil water separation may also be added before the DAF unit.
DAF equipment is commonly applied in food processing plants, slaughterhouses, dairy factories, oil processing facilities, petrochemical wastewater, textile and dyeing wastewater, paper mill wastewater and municipal wastewater pretreatment. It is especially useful when pollutants are difficult to remove by simple sedimentation because oil, grease or fine particles tend to float or remain suspended in water.
For B2B buyers, correct equipment selection is critical. Important parameters include daily flow rate, peak flow, inlet SS, COD, BOD, oil and grease concentration, pH, temperature, chemical dosing conditions and required outlet quality. The equipment material should also be selected according to wastewater corrosiveness and operating environment. Common options may include carbon steel with anti-corrosion coating or stainless steel, depending on project needs.
DAF is not always a standalone complete treatment solution. For wastewater containing dissolved organic pollutants, ammonia nitrogen or complex industrial chemicals, DAF is usually used as pretreatment before biological treatment, filtration, advanced oxidation or other downstream processes. For sludge generated by flotation, sludge thickening or dewatering equipment may be needed to reduce disposal costs.
Qingdao Jinwantong can provide DAF machines as single equipment or as part of a complete wastewater treatment system. Customers can send us flow rate, inlet water quality, wastewater source, site layout and discharge standard, and our team will help evaluate a practical DAF configuration and quotation plan.
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