Lightweight filter material filter tank

Abstract

The patent relates to a lightweight filter material filter tank, which mainly comprises a tank, water distributing units, a filter material unit, a filter material cleaning unit, a water outlet unit,a sludge discharging unit and a ventilation unit. The filter tank is characterized in that except from an air inlet and ventilation opening, the other space is closed. According to the feature that alightweight filter material is lighter than water, when the lightweight filter material is accumulated in water, the lightweight filter material is floated in a distribution state that a large part ofthe lightweight filter material is above the water surface and a small part of the lightweight filter material is under the water surface. A filter material layer above the water surface is taken asa main biochemical reaction, and sufficient oxygen supply and efficient biochemical reaction are achieved with relatively low energy consumption through ventilation and water distribution. The cleaning unit is arranged under the water, and the cleaned filter material is recycled to the surface of the filter layer, so that the filter material is continuously renewed, the activity of a biological membrane is ensured and blocking and short-circuiting of a filter layer are prevented. The cleaned sludge is discharged at regular intervals through the sludge discharging unit. The tank is free of filter plate, is simple in structure, and is efficient and energy-saving, and is free of blocking or short circuiting.

Description

technical field [0001] The invention belongs to the field of sewage and waste gas treatment, and in particular relates to a light filter material filter tank. Background technique [0002] Microbial cells can firmly attach to almost any suitable carrier surface in the water environment, and grow and multiply on it. The extracellular polymers extending from the inside of the cell to the outside of the cell make the microbial cells form a fibrous tangle structure, which is convenient called a biofilm. [0003] Biological aerated filter (BAF) is a wastewater treatment process that integrates biofilm biochemical degradation and filter layer filtration functions. With the help of biofilm generated on the surface of the filter material, the degradation, nitrification and denitrification of pollutants are realized. When the sewage flows through the filter bed, the pollutants are firstly filtered and adsorbed, and then oxidized and decomposed by the microorganisms in the biofilm. I...

AI Technical Summary

Problems solved by technology

[0005] It is precisely because of the "surface dirt interception" phenomenon of the sieving effect that the filtration resistance of the filter gradually increases during use, and in severe cases, the filter is blocked, so that the decomposition of the middle and lower filter materials cannot be fully exerted, reducing the Improve processing efficiency, increase backwashing frequency and intensity

Images