Gas lifting alternative circulation flow composite filter material filter pool

Abstract

The present invention provides a kind of air lifting circular flow filter with composite filter material, and belongs to the field of high efficiency bioreactor for water resource protection. The filter has both outer circulation structure and inner circulation structure, switching valve for alternate air supply to two aerators so as to obtain altered circular flow, and composite filter material operating alternately in the ascending area and the descending area to optimize operation environment. It operates in a biomembrane plus filtering process to eliminate organic matter and ammonia nitrogen simultaneously. The present invention is superior in management and treating effect, and may become new generation of bioreactor to replace available aerobic biofilter and air-lift circular fluidizing bed.

Description

technical field [0001] The invention belongs to a novel high-efficiency bioreactor in the field of water resource protection, and in particular relates to an air-lifting alternating circulating flow composite filter material filter. Background technique [0002] Biological aerated filter and air-lift circulating fluidized bed have completely different structural forms, and are two important processes in the water treatment industry at present. The biological aerated filter process uses two types of fillers (or filter materials): stacking and suspension. The stacking filter integrates two functions of biological treatment and filtration, but it needs frequent backwashing and sedimentation. For follow-up treatment, the smaller the particle size of the filter material, the larger the effective surface area, and the better the treatment effect of the biological aerated filter, but the small particle size has small porosity, large water flow resistance, and easy clogging, which w...

AI Technical Summary

Problems solved by technology

The biological aerated filter process uses two types of fillers (or filter materials): stacking and suspension. The stacking filter integrates two functions of biological treatment and filtration, but it needs frequent backwashing and sedimentation. For follow-up treatment, the smaller the particle size of the filter material, the larger the effective surface area, and the better the treatment effect of the biological aerated filter, but the small particle size has small porosity, large water flow resistance, and easy clogging, which will shorten the working cycle and filter The material is not easy to clean; the suspension filter material mainly includes soft fiber filter material and semi-soft filter material, which has small water flow resistance, good film hanging and processing performance, but basically cannot play a filtering role; the water flow state is not ideal, Easy to be bonded together by microbial film, resulting in ball formation

Although the gas lift circulating fluidized bed process has the characteristics of high volumetric efficiency and high load, it is difficult to form a film due to the easy deposition of the carrier, and the start-up and recovery operations are complicated

It is precisely because of these defects that the application of the above-mentioned technology in water treatment is limited.

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