Dissolved air flotation equipment is a commonly used air flotation method at home and abroad. To a certain extent, it mainly uses its container tank to make air into the water under a certain pressure, and can present its saturated state, and then effectively make the wastewater in the air flotation tank When the pressure drops suddenly, the air is precipitated from the water with tiny bubbles and carried out air flotation. The diameter of the bubbles formed by this method is only about 80 mm, and the purification effect is better than that of inflatable air flotation. L waste water.
To a certain extent, dissolved air flotation equipment mainly relies on its countless microbubbles to adhere to flocs. Therefore, the requirements for coagulation can be appropriately reduced, which can save coagulation dosage and reduce reaction time, because air flotation relies on air bubbles to hold up For floccules, the more and heavier the floccules, the more air bubbles are required. Therefore, air flotation is not suitable for high turbidity wastewater but more suitable for low turbidity wastewater.
The gas collection device of the dissolved air flotation equipment should first be able to reliably remove the biogas accumulated in the gas chamber and maintain a normal gas-liquid interface. The gas pipe diameter should be large enough to avoid clogging due to solids in the gas entering the pipe. It is important to install an additional device to release the gas in the event of gas blockage, so as to avoid a large pressure on the reactor structure, generally in the form of a water-sealed tank. Biogas contains saturated steam and hydrogen sulfide, which is corrosive to a certain extent.
Intake method of dissolved air flotation machine
The dissolved air flotation equipment will have two air intake methods during operation, the air intake of the equipment pump and the air intake after the pump. This is mainly a pipe led by the water pump pressure pipe to return to the suction pipe, and a hydraulic jet is installed on the branch pipe. When the waste water passes through the hydraulic ejector, a negative pressure is created, and after the air is sucked in and mixed with the waste water, it is sent into the dissolved air tank through the suction pipe and the water pump. This method saves the air compressor, which is relatively simple, and the water and air are evenly mixed, but the water pump must adopt self-priming water intake, and the water head must be kept above 1m. In addition, its maximum suction capacity should not be greater than 10% of the water suction capacity of the pump, otherwise, the pump will work unstable and cause cavitation.
Dissolved air flotation equipment takes in air after the pump, usually through the pressure water pipe. This method can make the pump work stably. To a certain extent, it is not required to work under positive pressure, but it needs to be supplied by an air compressor. Air, in order to ensure a good effect of dissolving air, the volume of the dissolving tank is relatively large, and generally a more complicated filling type dissolving tank is required.
The long pin shaft of the dissolved air flotation machine is generally used between the scraper and the connecting block. It is used for fixed connection of mud scraper and can be used as scraper traction plastic chain. It is characterized in that the drive sprocket is fixedly installed on the upper adjustment seat, and the upper adjustment seat is movably connected with the lower adjustment seat through a movable shaft. The other part of the upper adjustment seat One end is provided with an adjusting bolt, and the spherical shaft of the adjusting bolt is fixed on the corresponding position of the lower adjusting seat.
After assembling the nylon chain of the dissolved air flotation machine, be sure to install the circlip into the connecting block to prevent the scraper from slipping off after the long axis is out of stock during use. Install the assembled nylon chain slag scraper on the dissolved air flotation machine. When adjusting the tension on the machine, the chain must not be too tight, and it must be gradually locked with the looseness of the chain during use.
