Floating and separation process of air-carrying flocs in air flotation machine of sewage treatment equipment

      Talking about the knowledge of belt filter press about the floatation and separation process of air-carrying flocculant in the air flotation machine of sewage treatment equipment.

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The air-carrying floccules in the air flotation machine of the sewage treatment equipment have achieved an upward speed U up after the balance of buoyancy, gravity and water flow resistance in the contact chamber. After entering the separation zone, it is subjected to two forces: one is the horizontal velocity U caused by the horizontal thrust after the water flow spreads; the other is the downward velocity U caused by the bottom outflow. The combined velocity and direction of these two flow rates determines whether the aerated flocs will float up and be removed, or be carried out with the water flow. As for the rising or falling speed, it depends on the combined speed U and the size of the projection on the vertical axis. This speed affects the treatment effect of the air flotation machine. The size of the flocs, the size of the bubbles, and the downward velocity of the water in the air flotation tank directly affect the synthesis upward velocity. The higher the synthesis upward speed, the higher the removal efficiency of air flotation, the smaller the air flotation tank body, and the lower the overall project cost. To make the floating effect good, first lower the U bottom in the pool as much as possible. It can be achieved by expanding the outflow area at the bottom or improving the uniformity of the outflow. With the uniform flow collection and outflow at the bottom, the water flow to the end of the pool U is approximately zero, which is beneficial to the air-carrying flocs with less buoyancy. Separation; if the floating removal is to be achieved in advance, the u-level should be reduced as much as possible, which can be achieved by expanding the cross section of the air flotation tank. Next, the size of the flocs should be treated well, which is completed by mixing with chemicals and flocculation reaction. The following points should be controlled, the variety of chemicals, dosage, mixing time and mixing intensity of chemicals and sewage, and dosage points of chemicals. The reaction time and intensity of the chemical and sewage, and the size of the flocs produced. In addition, the size of bubbles in the dissolved gas system must be controlled.

The movement state of particles in the separation zone of the vertical flow type air flotation tank is similar to that of the advection type. However, the horizontal velocity is much smaller, and with the increase of the radial distance, the section expands rapidly, and the u-plane decreases rapidly. Especially the vertical flow velocity direction change coup is not big, the flocs are mainly affected by the inertia of the upward water flow driving force, and the upward velocity of the particles increases, making the separation conditions of the aerated flocs and the water body much better than the advection type. . However, it is necessary to make a comprehensive evaluation of the various conditions to determine what form to use.

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