The key points of MBR membrane bioreactor aeration design
The aeration device can be fixed at the bottom of the pool (membrane module supporting bracket and membrane module sliding into the guide rail are required), or it can be built together with the membrane module. Each has its advantages and disadvantages. The position of the aeration pipe should be carefully considered, using DN20 Perforated pipe, each diaphragm gap corresponds to one perforated pipe, the perforation size is Φ2.0mm, the perforation spacing is 100mm, the perforation positions of the adjacent two pipes are staggered, and the orifices are made in a single row and vertically upwards, and the sedimented sludge will not be against the orifices Produce blockage.
The aeration volume is roughly estimated. According to experience figures, according to the steam-water ratio of 24:1 (subject to the instructions) (conventional pool depth 3.5m), the fan exhaust pressure head selection is 0.01Mpa higher than the maximum liquid level; The outlet of the fan is equipped with a vent valve, and the vent pipe can be fully opened to remove 70% of the air volume. A silencer is installed on the vent port. This device is used to control the DO value in the biochemical tank and protect the fan;
Each membrane module aeration is equipped with a separate regulating valve, and at the same time, the aeration and aeration of the entire biochemical tank should be made as a separate control valve. A microporous aeration and aeration device is used to ensure that the amount of agitated air and charging can be adjusted flexibly Oxygen air volume
The best DO control of MBR tank is between 2.5~5, and the normal liquid level is about 3ppm. When the liquid level is different, the DO will also change. It should not exceed 5.0ppm for a long time.