Membrane microporous aerator

Introduction:
1. The gas diffusion rubber plate of the membrane type microporous aerator is made of high-quality synthetic rubber. The diameter of the bubbles diffused by the rubber membrane is small, and the gas-liquid interface area is large. Therefore, it has a high mass transfer rate and high oxygenation efficiency. Compared with other current aeration devices, it can greatly save electricity consumption and reduce the operating cost of sewage treatment.
2. The rubber membrane has a large number of self closing holes, which can automatically open and close with oxygenation and shutdown, thus avoiding problems such as hole blockage and contamination. At the same time, the air entering the aerator does not need to be purified by dust removal. When the aeration tank stops running, the sewage mixture will not backflow, which can reduce a lot of operating costs and maintenance workload.
3. Due to the fact that the membrane type microporous aerator can be fully distributed at the bottom of the aeration tank, the dissolved oxygen in the tank is uniform, making it suitable for various tank types and depths. It can also be modified to improve the efficiency of the original aeration tank.
4. Due to the fact that the gas diffusion of the membrane type microporous aerator is made of high-quality rubber, it has excellent physical and mechanical properties. The tray, accessories, and air pipes are made of engineering plastics and polypropylene materials, which are not afraid of rust and greatly reduce the workload of operation and maintenance.

Basic structure:
The membrane type microporous aerator system is mainly composed of aerator base, upper spiral cover, air flow plate, synthetic rubber membrane and other components, all of which are made of engineering plastic. When assembling, simply put the microporous rubber membrane on the air flow plate and place it in the aerator base with sealing line, and then tighten it with the upper spiral cover.
The air pipeline is made of polypropylene or ABS engineering plastic pipe (depending on the user's needs), with 3/4 internal thread joints welded on top. The microporous aeration head is directly screwed onto the gas distribution pipeline, making installation and use convenient and conducive to maintenance and repair.
The diameter of YMB-I type microporous aerator is D=260mm (or 250): Type II D=215mm (or 189). There are 2100-2500 open and closed holes arranged according to certain rules on the synthetic rubber membrane. When inflating, air passes through the air distribution pipeline and the air flow plate, evenly entering between the rubber membranes. Under the action of air pressure, the membrane slightly bulges and the holes open, achieving the purpose of air diffusion. When the gas supply is stopped, the pressure between the membrane and the air flow plate gradually decreases, causing the holes to gradually close. When the pressure disappears completely, due to the water pressure and the rebound of the membrane itself, the membrane is compacted on the air flow plate.
Given the above structure and the good characteristics of the membrane itself, it is impossible for the mixed liquid in the aeration tank to backflow, and therefore, it will not contaminate the pores. On the other hand, when the pores are opened, due to the elastic effect of the rubber, the small amount of dust contained in the air will not cause the aerator to crack the aerator
Gap blockage.
Main performance parameters:
1. Aerator size Type I D=260mm (or 250); Type II D=215mm (or 189)
2. The average pore size of the aerator membrane is 80-100 μ m
3. Air flow rate of 1.5-3m3 per unit · n
4. Service area Type I 0.5-0.7m2 per unit; Type II 0.35-0.5m2 pieces;
5. Oxygen total transfer area coefficient KIa (20 ℃) 0.204-0.337mm-1
6. Oxygen utilization rate (water depth 3.2m) 18.4-27.7%
7. Oxygenation capacity 0.112-0.185kgO2/m3 · h
8. Oxygenation power efficiency 4.46-5.19kgO2/KW. h
9. Aerator resistance 180-280mm · H2O

Layout, installation, and debugging
1. The membrane type microporous aerator is generally evenly arranged at the bottom of the aeration tank. According to foreign data, a gradually decreasing aeration method is commonly used for push flow aeration tanks, with a four stage arrangement of 35%, 27%, 23%, and 15%. This arrangement can further optimize the operation and save energy of the aeration system.
2. When the membrane type microporous aerator is vertically arranged, the surface of the aerator is 200mm away from the bottom of the tank or the center of the air pipe is 120mm away from the bottom of the tank.
3. The design of air pipes should consider pressure balance and preferably form a ring network. Each group of branch pipes should be equipped with valves to facilitate the adjustment of air volume. The design flow rate of air pipes is 15-15m/s for the main pipes; The branch pipe has a speed of 5m/s. When installing the air pipe, it should be kept horizontal. When laying the pipeline along the pool core and bottom, brackets should be set up for fixation. Rubber hoses should be used to connect the air pipe and the air connection.
4. When installing the aerator, it must be installed in the designated position according to the design requirements, using pipeline supports accurately and without error. Steel plates should be embedded at the bottom of the tank and connected to the supports with bolts. Expansion bolts can also be used to fix the bottom of the tank.

Debugging and inspection methods
After the installation of the membrane type microporous aerator is completed, clear water should be released into the aeration tank. The water level should be about 300-500mm from the top of the aerator, and then the following three inspections should be carried out.
1. Check the height of the entire tank aerator, whether it is on a horizontal plane (should be observed during the water discharge process), and adjust it accordingly.
2. Check all pipelines, interfaces, joints, and seals for air leaks.
3. Check whether the upper water surface of all aerators is evenly covered with small bubbles at a gas supply rate of 2-2.5m3/h (per plate).