Ld215 microporous aerator is a new type of aerator specially developed by our company based on the original membrane microporous aerator according to the process characteristics of sewage biological treatment. The overall structure of the aerator is scientific and reasonable, the process is advanced and the design is novel. The microporous aerator and supporting tray have a unique spherical crown structure. The aerator has excellent performance of anti blocking and backflow of waterproof body. Under intermittent operation conditions, sludge is not easy to deposit on the surface of aeration membrane. Compared with the flat diaphragm microporous aerator, it has longer service life and higher oxygenation efficiency, and is also suitable for the biological treatment of micro pollution of source sewage.