Selection of river specific push flow aerators, submersible push flow aerators, submerged fans, and underwater centrifugal aerators

Jiangsu Du'an Environmental Protection Push Flow Aeration MachineTechnical Requirements

　　The submersible centrifugal aerator consists of a submersible motor, an intake pipe, a mixing chamber, and an aeration disc.

　　The submersible centrifugal aerator can operate normally within the specified range without cavitation, with a running noise of less than 70 decibels and smooth operation. The motor has sufficient rated power.

　　All pressure bearing parts of the submersible centrifugal aerator shall undergo a pressure test, with a test pressure of twice its design pressure but not less than 0.2Mpa, for a period of 5 minutes without any leakage.

　　After assembly, the submersible centrifugal aerator underwent a 0.2Mpa air pressure test for 5 minutes without any leakage.

　　5. The submersible centrifugal aerator is sprayed with epoxy resin anti-corrosion paint, with a coating thickness greater than 300 μ m, and its surface is bright without sand holes, cracks, etc. The overcurrent components are sprayed with epoxy resin anti-corrosion paint.

　　6. Dynamic balance test of submersible centrifugal aerator wheels and rotors, with a balance accuracy of G6.3 level.

　　The stainless steel nameplate is firmly fixed in a prominent position on each submersible centrifugal aerator, and the nameplate is marked with stamped numbers.

　　The lifting ears of each submersible centrifugal aerator are securely and reliably placed near the center of gravity of the aerator cover.

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The submersible centrifugal aerator moves through the impeller, which can drive bubbles when rotating. Then, the untreated sewage is injected with bubbles, which produce varying degrees of physical and chemical changes under the combined action of coagulants and flocculants, forming large suspended solids. The bubbles then generate buoyancy to slowly lift the flocs up to the surface and form floating debris.

During the operation of the submersible centrifugal aerator, a negative pressure zone is formed by the high-speed rotation of the submersible motor, which drives the water pump impeller and the mud mixture to push and spray. The generated jet is sucked into the negative pressure zone of the nozzle through the suction pipe, and the gas is fully mixed with water and sludge in the jet pipe. The jet diffusion pipe gradually converts the jet flow into pressure energy for diffusion.

This is also the key reason why the aerator is called an aerator. With this type of diffuser equipment, combined with the original injection equipment, the effect of diffuser is achieved, forming the so-called aeration.

As for the current submersible aerators, they are mainly used in sewage treatment tanks. Their operation is similar to that of mixing machinery, which uses a motor to start and then the high-speed operation of the impeller to mix the medium in the tank and push it into the jet injector. The high-speed rotation of the impeller around the jet injector causes the air pressure to be in a negative state. This effect causes a portion of the air to be drawn into the jet generator, and the motor and impeller are on the same axis, so the operation of the impeller and the transmission of the motor are relatively synchronized.

Push flow aeratorDuring operation, the water pump impeller and mud mixture driven by the high-speed rotation of the submersible motor form a negative pressure zone. The generated jet is sucked into the negative pressure zone of the nozzle through the suction pipe, and the gas is fully mixed with water and sludge in the jet pipe. The jet momentum of the jet diffusion pipe gradually converts into pressure energy and enters the diffusion.

In the diffuser, the mixed gas of gas, water, and mud is forced to undergo further shearing, crushing, and emulsification, ensuring the most sufficient oxygen dissolution in the water. At the same time, under the pressure of the fluid, oxygen carrying molecules and tiny bubbles are obliquely sprayed downwards from the diffusion tube nozzle, diffusing to form water and affect the sludge at the bottom of the biochemical tank. After stirring, they slowly rise from the bottom of the tank to the water surface, and the microbubbles stop leaving the water for a long time30 seconds is the complete dissolution and absorption of oxygen, improving oxygen transmission efficiency and oxygen.

The performance of centrifugal fans is influenced by the mud in the air, the high negative pressure and strong turbulence generated in the air, mixing, shearing, and the liquid and gas films that promote high-frequency oscillation. The diameter of bubbles is greatly reduced, the number of bubbles increases, and the specific surface area of bubbles increases. At the same time, the thinning of gas-liquid film can greatly reduce mass transfer resistance and facilitate the transfer of molecular oxygen from the gas phase to the liquid phase.

During the high-speed process, the jet has a high angular velocity due to the dispersing effect of high-speed rotation. The jet has strong penetration power, and the tiny bubbles travel far on the water, enhancing stirring, clogging, and aerobic capacity.

Push flow aeratorIt is a technology that makes air and water strong, with the purpose of dissolving oxygen dissolved in water or not requiring the introduction of gases and volatile substances into the air. In other words, it is a way to promote the exchange of gas and liquid substances.

It also has other important functions, such as mixing and blending. The mass transfer operation and dispersion mass transfer principle in which oxygen in air is converted into water and oxygen from the gas phase to the liquid phase through aeration are commonly proposed by the Lewis and Whitman double membrane theory.

The double membrane theory holds that there are gas and liquid film, air and liquid film and liquid film at the gas water interface, which belong to turbulent flowThe relationship between gas and liquid film belongs to laminar flow conditions, without convection. Under certain conditions, pressure and concentration gradients can occur. If the oxygen concentration in the liquid film is lower than that in water, the oxygen in the air will continue to disperse into the water through the liquid film. Obviously, the most effective method to overcome the membrane barrier of liquids is to change the "gas-liquid" interface.

Aeration agitation is like this. The detailed methods are: reduce the size of bubbles, increase the amount of foam, improve the level of liquid turbulence, improve the depth of aeration equipment, and extend the contact time of bubbles and liquid. Aeration equipment is a commonly used treatment method in sewage treatment.