Improved backwashing device for biofilter and application of backwashing device in backwashing of biofilter

Abstract

The invention belongs to sewage treatment equipment, and specifically relates to an improved backwashing device for a biofilter and an application of the backwashing device in backwashing of the biofilter. The backwashing device comprises the biofilter which is provided with a buffer water-distribution zone, a filtering plate, a supporting layer, a filtering material layer and a clear water zone,wherein the input ends of a backwashing air inlet pipeline, a water inlet pipeline and a backwashing water inlet pipeline are separately connected with the buffer water distribution zone; the backwashing water outlet located in the clear water zone is connected with a water discharge pipeline; a turbidity detector is arranged in the clear water zone; the turbidity detector and pumping units and control valves arranged in an air inlet pipeline, the backwashing air inlet pipeline, the water inlet pipeline, the water discharge pipeline, the backwashing water inlet pipeline and a backwashing waterdischarge pipeline are electrically connected with a control device; the backwashing water outlet of the biofilter is provided with a filtering net; a water inlet pressure sensor is arranged on the water inlet pipeline; and the signal output end of the water inlet pressure sensor is connected with the control device. The improved backwashing device provided by the invention effectively solves theproblem of unstable backwashing effect in the prior art, and has the advantages of significantly-reduced energy consumption, small equipment and civil engineering investment, etc.

Description

technical field [0001] The invention belongs to a sewage treatment device, in particular to an improved backwashing device of a biological filter and its application in the backwashing of a biological filter. Background technique [0002] Biofilter, which integrates biochemical reaction and filtration, relies on the physical filtration of the filler in the sewage (waste) water treatment structure, and the combined removal of biochemical effects such as aerobic oxidation and anoxic denitrification of the biofilm attached to the filler. Artificial treatment technology of pollutants in sewage (waste) water. According to the treatment of different pollutants, biological filters can be divided into carbon oxidation filters, nitrification aerated biological filters, post-denitrification or pre-denitrification filters, etc. Compared with the ordinary activated sludge process, the biological filter process saves the follow-up sedimentation tank, has the characteristics of large vol...

AI Technical Summary

Problems solved by technology

The higher the height of the clear water area, there are the following problems: First, the increase in the height of the filter tank increases the invalid volume, resulting in a longer residence time of the backwash water in the filter tank, and the suspended solids in the water need a larger amount of backwash water to be washed out of the tank Second, the height of the filter tank increases, which increases the construction cost of the tank body; third, the height of the filter tank increases, resulting in an increase in the head of the water inlet pump and backwash pump, the wind pressure of the backwash fan, and the pressure level of equipment selection. Increased power increases equipment investment and operating costs

The problems of the above-mentioned two existing technologies are as follows: one is that the filter involved only plays a filtering role, and there is no biofilm growth on the filler surface in the filter, and there is no problem that the biofilm needs to be backwashed and renewed

The second is that the backwashing process involved is only air-water mixed washing, which is different from the process of air washing, air-water mixed washing, and water washing in biological filters.

The third is that the liquid level and pressure signals are only used as the judgment of backwashing start and stop, and are not used as signals to adjust the backwashing intensity or backwashing effect

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