The dissolved air flotation machine uses a new type of efficient dissolved air equipment microbubble generator to replace the traditional air entrainment equipment to dissolve air into the water, and installs several inclined tube groups in the air flotation area, including a box, a slag scraper, and a spiral outlet. The material machine together forms a complete air flotation water purification device. Theoretically speaking, the treatment effect of air flotation is not directly related to the residence time, but is only related to the air flotation area. If the air flotation area of the water depth is reduced to the water depth, the air flotation distance and residence time will be reduced by 2 times. This is The famous shallow pool theory. The purpose of adding inclined tubes in the air flotation area is to increase the air flotation area, greatly reduce the Reynolds coefficient, avoid air flotation in a turbulent flow state, create a good laminar flow state, and achieve the effect of shallow air flotation.
Similarly, when the density of suspended solids is greater than 1, due to the installation of the inclined tube group, a shallow pool sedimentation effect will occur, allowing sedimentation to proceed under turbulent flow conditions. Pollutants with large particle sizes and large specific gravity that are not easy to float will be concentrated in the mud collection area to achieve the purpose of water purification.
According to the water flow mode, it can be divided into advection dissolved air flotation machines, upflow dissolved air flotation machines and comprehensive dissolved air flotation machines.
Air flotation is suitable for treating water with low turbidity, high color, high organic content, low oil content, low surface active substance content or water with abundant algae. Compared with other air flotation methods, it has the advantages of high hydraulic load and compact pool body. However, its complicated process, large power consumption, and high noise of the air compressor also limit its application
1. Check whether the inlet sewage pump and return pump of the dissolved air flotation machine are frozen every day when you go to work. Including the lubrication and refueling of the water pump, the tightness of the packing, the sealing of the bottom valve, and the filling of oil in the air compressor.
2. Check whether the air filter of the air compressor is frozen to determine whether the air compressor is operating normally and whether there is any noise or heat.
3. Check whether the transmission part and scraper of the slag scraper are hardened and broken in the cold state, so as not to affect the use.
4. Pay attention to the coagulant mixing storage tank to avoid freezing, and conduct small sample tests frequently.
5. Check the valve pipelines of each equipment to avoid blockage in the valve pipelines, and place them in the open or closed position as required.
6. The water must be drained when shutting down to avoid freezing and blockage.
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