The utility model discloses a multistage
aeration tank, which relates to the technical field of
aeration tanks, and comprises a box body, the upper surface of the box body is fixedly connected with a cover plate, the upper part of the right side of the box body is fixedly connected with a water inlet
pipe, and the lower part of the left side of the box body is fixedly connected with a water outlet
pipe. Through the arrangement of the first filtering
assembly and the second filtering
assembly, large impurities and small impurities in
sewage are distinguished, so that the rapid blocking phenomenon is prevented, the filtering and using time of the filtering net is prolonged, through the arrangement of a
threaded rod and an L-shaped scraping plate, the impurities of the filtering net can be conveniently cleaned, and the filtering effect of the filtering net is improved. The problems that an existing filter screen is short in
service time, the
impurity blocking speed is high, and the filter screen is troublesome to clean due to the fact that a fixing structure is frequently disassembled are solved, the
service time of the filter screen is prolonged, the filter screen does not need to be cleaned due to the fact that the fixing structure does not need to be disassembled, and the practicability is high. Therefore, the use is convenient.