Continuous backwashing aeration biofilter

Abstract

This invention discloses a continuous backwashing aeration biofilter, comprising a cylinder, a feed water distribution system inserted into the cylinder and used for feeding raw water, an aeration system inserted to the cylinder and used for feeding air, a clear water drainage system arranged on the cylinder and used for draining treated clear water, a filter material box arranged at the bottom of the cylinder and communicated with an inner chamber of the cylinder, a filter material cleaning device arranged at the top of the cylinder and communicated with the inner chamber of the cylinder and used for cleaning the filter material, and a filter material lifter used for lifting the filter material. The filter material box contains the filter material used for retaining suspended solids and facilitating the growth of a biofilm. The filter material box, the filter material lifter and the filter material cleaning device are connected in turn through a filter material lifting pipe. This continuous backwashing aeration biofilter realizes continuous backwashing of the filter material without shut-down, is capable of continuously running, convenient for operation, energy-saving and high in processing efficiency.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an aeration biological filter. Background technique [0002] "Biological aerated filter" is a kind of "biofilm" sewage treatment technology. Its process principle is to fill the filter with granular filter material with high specific surface area to provide a carrier for microbial film growth. An aeration device is installed, and the air is in contact with the sewage in the same direction, so that the biochemical reaction between the organic matter in the sewage and the biofilm on the surface of the filter material can be degraded and removed, and the filter material also plays a role of filtration and interception. The biggest feature of the biological aerated filter is that it integrates biological oxidation and interception of suspended solids, saving the subsequent secondary sedimentation tank, and its biggest advantage is to reduce BOD 5 , functions s...

AI Technical Summary

Problems solved by technology

[0003] The domestic traditional biological aerated filter has sticky filter material, which is easy to be clogged, and requires frequent shutdown and backwashing to ensure the work; and due to the viscosity of biological sludge and other reasons, there is also the problem of difficult backwashing, which requires a large amount of air and water combined with backwashing. washing; the above disadvantages result in complex operation, energy waste and low work efficiency, which also limit its application

Images