The DAF system dissolves compressed air into recycled water under 4 to 6 bar pressure. When released into the flotation basin at atmospheric pressure, billions of 10 to 30 micron microbubbles precipitate out. These tiny bubbles adhere to hydrophobic plastic fines, paper fibers, and flocculated colloids, lifting them to the surface as dense float sludge that is continually removed by a mechanical surface skimmer.

Typically, an inorganic coagulant such as Polyaluminium Chloride (PAC) is dosed to neutralize negative surface charges on suspended particles, followed by an organic polymer flocculant such as Polyacrylamide (PAM) to bridge micro-flocs into larger, buoyant agglomerates. Dosing rates depend on influent turbidity and COD levels.

Yes. In closed-loop plastic recycling lines (such as PET bottle, PP woven bag, or HDPE film washing), DAF removes 95% to 99% of total suspended solids (TSS) and residual oils. Clarified water can be piped directly back to friction washers, sink-float separation tanks, and pre-wash trommels, reducing plant freshwater intake by over 85%.

The continuous chain-flight skimmer discharges floating sludge into a dedicated collection hopper. The wet sludge can then be directed to a sludge dewatering press (such as a multi-disk screw press or chamber filter press) to produce compact dry filter cakes, minimizing waste volume and disposal costs.

Routine maintenance includes checking the dissolved air multiphase pump pressure (4-6 bar), inspecting skimmer chain tension and wiper blades, flushing bottom sediment drain valves, and replenishing chemical dosing tanks. Built with stainless steel (SUS304/SUS316), the main tank structure resists corrosive wash chemicals for years of low-maintenance service.