Improved structure for gas and water mix backwash of aerating biological filter

Abstract

The invention relates to an improved gas-water mixed backwash structure of an aeration biological filter chamber. The clear water in a clear water pool (8) is pumped out by a pressurizing water pump (12) and is led to the bottom of a chamber body (1) through a water distributing pipe net (13), then the clear water passes through a filter material (7) from bottom to top so as to take filter residue (15); then the water enters into a backwash water collecting groove (4) through a sieve (17); the sewage flows to a sewage pool (9) through a water drainage pipeline (6); the upward side of the backwash water collecting groove (4) is provided with a through length supporting lever (16); the sieve (17) encases the backwash water collecting groove (4) and the supporting lever (16) so as to ensure that the filter bed restores the function of filtering and purifying the sewage, prolongs the backwash period and reduces the backwash frequency, as well as ensure that the sewage purifying system canbe better and normally operated; the sieve has simple mounting and dismounting, less material consumption and convenient maintenance.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an improved structure of gas and water mixed backwashing in an aerated biological filter. Background technique [0002] Chemical Oxygen Demand (COD Cr ) is an important pollution indicator of organic sewage. After conventional secondary microbial treatment (anaerobic unit + aerobic unit), the sewage can generally reduce the chemical oxygen demand to 80-90mg / L, which meets the COD in the secondary discharge standard. Cr ≤100mg / L requirement. However, the current national environmental protection measures for energy conservation and emission reduction are increasingly strengthened, and the emission standards of many industries require the discharge of COD Cr ≤50mg / L, while COD Cr It is difficult to reduce from 90mg / L to 50mg / L, and the conventional secondary microbial treatment system cannot achieve this goal. It is necessary to add an advanced treatment system behin...

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide an improved structure for the mixed backwashing of biological aerated filter with gas and water, so as to solve the defects in the prior art that the backwashing effect is not good, and the screen is easy to be damaged or fall off.

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