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 install several inclined tube groups in the air flotation area, including a box slag scraper and a screw discharger. Together they form 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 /, then 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. In the same way, when the density of suspended solids is greater than 1, the installation of the inclined tube group will produce a shallow pool sedimentation effect, allowing sedimentation to occur under turbulent flow conditions. Pollutants with large particle size 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 machine, upflow dissolved air flotation machine and comprehensive dissolved air flotation machine.
Dissolved 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 rich in algae. Compared with other air flotation methods, it has the advantages of high hydraulic load and compact pool body. However, its complex process, large power consumption, and high noise of the air compressor also limit its application
Check whether the inlet sewage pump and return pump of the dissolved air flotation machine are frozen every day at work, including The lubrication of the water pump, the tightness of the packing, and the sealing of the bottom valve are better than 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. When shutting down, the water must be drained to avoid freezing and clogging.
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