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微孔曝气器的风管布置方式和影响
Release time:
2022-12-30 14:50
Microporous aerators have two types of air duct layouts in aeration tanks: gallery layout and top air duct layout (without gallery). The air velocity of the main and branch pipes of the aerator is 10~15m/s. The air velocity of the vertical pipes and small branch pipes is 4~5m/s. When the air duct is connected to the aeration tank, the top of the pipe should be at least 0.5m above the water surface.
1. Layout of microporous aerators with gallery:
The air ducts of the aerobic bioreactor are generally designed within the gallery for easy maintenance, walkways, and operation of control valves. The gallery height is 0.8~1.0m. Note that the elevation of the outer wall at the bottom of the gallery should be higher than the liquid level in the aeration tank to prevent the gallery from being submerged. The slope of the bottom of the air duct gallery is 0.1%, sloping towards the drainage hole at the end, and a vent pipe should be installed at the end of the gallery. The elevation of the vent pipe of the air duct should be higher than the liquid level in the aeration tank, and the vent position should prevent backflow of water from the tank into the gallery, especially in cold northern regions. A manual valve should be installed on the air branch pipe connected to each group of aerators for easy maintenance, and the valve should be located in the gallery.
2. Top layout of microporous aerator air ducts without gallery:
If space or land is limited, and to reduce the height of the bioreactor, the air duct gallery can be omitted, and the air ducts can be arranged on top of the aerobic tank. However, note that the air duct temperature is relatively high, and there should be maintenance space around it. Appropriate safety warnings should be provided on site, and the air duct location should avoid maintenance passages. The location and height of the valves should be convenient for operation and maintenance.
The diameter and air velocity of the branch pipes for each group of aeration tanks should be adjusted according to the distance from the blower, whether it is a ring layout, and whether it is designed for gradual aeration. The number of aerators in the latter part of the gradually aerated aerobic tank is less than that in the front part, so the air volume and air velocity are also different. The air velocity in the end branch pipe can be lower, and the air velocity value should be verified by calculating the pressure loss. Increasing the pipe diameter can reduce the resistance, and the pipe network resistance balance should be adjusted during design.
For air ducts with long pipelines, high air pressure, high blower power, and high air temperature, corrugated compensators (corrugated expansion joints) or double-flange loose-fitting limit joints should be installed at regular intervals to compensate for thermal deformation, absorb vibration, and reduce noise. The air duct system should have condensate drainage pipes, and the condensate drainage pipes should be installed at the end of the air branch pipes instead of the beginning, with valves installed at a convenient operating height.
The plane layout of the air ducts should ensure a balanced distribution of air volume and air pressure. In the case of multiple sets of parallel biological tanks supplied by the air main pipe, a limit expansion joint should be installed at the beginning of the air duct for each set. When the air volume of each set requires accurate control (such as gradual aeration and "anoxic-aerobic" dual-function tanks), a linear flow control valve and flow meter should be designed.
Swirl aerator, microporous aerator, industrial wastewater treatment
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