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(2) The most widely used medium-bubble air diffusion device for perforated pipes is perforated pipes.
The perforated pipes are made of steel pipes or plastic pipes.
The diameter of the small holes is generally 3～5mm.
The holes are opened on the lower side of the pipe and form an angle of 45° with the vertical plane.
The hole spacing is 10-15mm, and the perforated pipe is set at a place 10-20cm above the bottom of the aeration tank, as shown in Figure 11-6
.
The arrangement of perforated pipes is generally 2 to 3 rows.
Figure 11-6 Air distribution method using perforated pipe
Figure 11-7 Shallow aerator (unit: m)
1- air pipe; 2- perforated pipe; 3- draft tube
In order to reduce the pressure, the arrangement of the perforated pipes also adopts the arrangement shown in Figure 11-7, that is, the perforated pipes are arranged in a grid shape and hung on the side of the pool at a distance of 0.
6 to 0.
8m from the water surface
(3) The vertical pipe is shown in Figure 11-8.
The vertical pipe is arranged on one side of the aeration tank, and the horizontal pipe is branched into a comb-shaped aeration method.
The vertical pipe has a diameter of 15mm or more and is about 150mm away from the bottom of the tank.
50～60cm, installed along the bottom of the pool, with 8～12 pipes forming a pipe group, which is easy to install and maintain.
The vertical pipe is a large bubble diffuser, because the large bubbles form strong turbulence when they rise and can turn the water surface violently Therefore, the process of renewing the bubble liquid film layer and absorbing oxygen from the atmosphere is strengthened.
Although the gas-liquid contact area is smaller than that of small and medium bubbles, the oxygen utilization rate is still between 6% and 7%, and the power efficiency It is 2～2.
6kgO 2 /(kW·h), the vertical pipe aeration device is simple in structure and management, and there is no clogging problem
.
Figure 11-8 Standpipe diffuser and its arrangement
(4) Hydraulic shearing diffusion device The hydraulic shearing diffusion device has an inverted basin type, a jet type (self-priming type and air supply type), and an impact type, as shown in Figure 11-9
.
They are composed of a basin-shaped plastic shell, a rubber plate, a plastic screw rod and a gland
Figure 11-9 Hydraulic shear diffuser
In addition to the aeration function, the jet diffusion device also has the function of pushing flow and mixing and stirring
.
The principle is to use the high-speed water flow of the mud-water mixture driven by the water pump as kinetic energy to inhale a large amount of air.
The mud, water, and air mixture are strongly mixed and agitated in the throat, so that the bubbles are crushed into mist, and then the kinetic energy is transformed into the diffuser tube.
