CN212374988U

CN212374988U - Layered upward flow double-layer structure biological filter

Info

Publication number: CN212374988U
Application number: CN201922493085.2U
Authority: CN
Inventors: 吴瑜红; 崔朋; 邹磊; 杨唯艺; 李卿
Original assignee: Central and Southern China Municipal Engineering Design and Research Institute Co Ltd
Current assignee: Central and Southern China Municipal Engineering Design and Research Institute Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-01-19
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses to conventional upward flow biofilter, no matter be the individual layer filter material filtering pond, still double-deck, multilayer filter material filtering pond, all pile up different particle diameters or different kinds of filter materials in same filter material layer as a whole, all filter materials work under same operating mode, get into simultaneously and filter or back flush state, cause back flush efficiency lower, the energy consumption is higher, the biomembrane drops too much scheduling problem, and provide a layer-stepping upward flow bilayer structure biofilter, this bilayer structure's biofilter is two-layer setting about will setting up the filter material layer inside the filtering pond, and set up middle catchment distribution area between upper filter material structure and lower floor's filter material structure, each filter material layer can independently operate, and then realize not only taking into account the filter material cleanness but also keeping active biomembrane, reduce the purpose of operation energy consumption.

Description

Layered upward flow double-layer structure biological filter

Technical Field

The utility model belongs to the technical field of sewage treatment, specifically be a laminar upflow bilayer structure biological filter.

Background

The biological filter belongs to the sewage treatment technology of biomembrane process, and is a sewage treatment process developed by integrating the sewage contact oxidation process and the structural form of water supply treatment filter. A certain amount of granular filter materials are filled in the biological filter, the thickness of the granular filter materials is usually 1.8-3 m, and thus after the granular filter materials are contacted with sewage for a period of time, a high-activity biological membrane suitable for the quality of the sewage can be cultured on the surface of the filter materials for sewage treatment. According to the sewage flow direction, the biological filter can be divided into an upward flow biological filter and a downward flow biological filter, after the sewage flows through a biological filter material layer from top to bottom, the aeration is carried out by blowing air at the lower part of the biological filter material layer, and the air is contacted with the sewage in the reverse direction or the same direction, so that the organic matters in the sewage and the biological film on the surface of the filter material are subjected to the biochemical reaction to obtain the stable treatment.

At present, the upward flow biological filter is more applied, sewage flows through the filter from bottom to top, when the sewage passes through a filter material layer, on one hand, a biological membrane on a filter material can degrade pollutants, and on the other hand, the filter material can intercept suspended matters in the sewage, so that the aim of purifying the sewage is fulfilled. After the biological filter operates for a period of time, along with the increase of the trapped pollutants and the thickening of the biological membrane, the head loss of the filter is increased. At this time, the filter chamber needs to be backwashed in order to release suspended matters intercepted by the filter material and remove the aged biological membrane. However, for the upward flow biofilter, the filter material at the lowest layer usually retains the most amount of suspended particles, but the whole filter material layer needs to be flushed into a fluidized state by backwashing, which consumes water and energy, and causes a large amount of biological membranes in the whole filter material layer to fall off, and the biological membranes need to be cultured again after backwashing, thereby affecting the sewage treatment effect.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a layer-stepping upflow bilayer structure biological filter, this biological filter is through carrying out the layering to the filtering material layer, can be focused to the most serious filter material of lower floor's jam back flush, and then realize the back flush of upper and lower floor's filter material different frequency, reach the purpose of taking into account the filter material cleanness and remaining active biomembrane, reduction operation energy consumption.

The utility model discloses a solve the technical scheme that its technical problem adopted and do:

a layered upflow double-layer structured biological filter comprises a filter body, wherein a filter material layer is arranged inside the filter body and is arranged in a two-layer structure which is respectively a lower-layer filter material structure arranged at the lower part in the filter body and an upper-layer filter material structure arranged at the upper part in the filter body, a middle water collecting and distributing area is arranged between the lower-layer filter material structure and the upper-layer filter material structure, one side of the middle water collecting and distributing area is provided with a lower-layer backwashing drain pipe used for backwashing drainage of the lower-layer filter material structure, the other side of the middle water collecting and distributing area is provided with an upper-layer backwashing water inlet pipe and an upper-layer backwashing air inlet pipe used for backwashing water inlet and air inlet of the upper-layer filter material structure, a lower-layer aeration pipe is arranged in the lower-layer filter material structure, an upper-layer aeration pipe is arranged in the upper-layer filter material structure, the other side is provided with a lower-layer backwashing water inlet pipe and a lower-layer backwashing air inlet pipe which are used for backwashing water inlet and air inlet of a lower-layer filtering material structure, one side of the top of the filter tank body is provided with an upper-layer backwashing water outlet pipe which is used for backwashing water outlet of an upper-layer filtering material structure, and the other side is provided with a purified water outlet pipe.

Furthermore, the lower-layer filter material structure comprises a lower-layer filter plate, a first lower-layer bearing layer, a second lower-layer bearing layer and a lower-layer filter material layer, the lower-layer filter plate is fixed on the side wall of the filter body, and the first lower-layer bearing layer, the second lower-layer bearing layer and the lower-layer filter material layer are sequentially laid on the lower-layer filter plate; the upper filter material structure comprises an upper filter plate, a first upper bearing layer, a second upper bearing layer and an upper filter material layer, the upper filter plate is fixed on the side wall of the filter body, and the first upper bearing layer, the second upper bearing layer and the upper filter material layer are sequentially laid on the upper filter plate.

The filter is characterized in that filter heads are arranged on the lower filter plate and the upper filter plate, the height of the middle water collecting and distributing area is 65% -75% of the thickness of the lower filter material layer, a perforated pipe used for exhausting is arranged on the upper portion of the middle water collecting and distributing area, the other end of the perforated pipe penetrates through the upper filter material layer, and control valves are arranged on all air inlet, water inlet and water outlet pipe fittings of the biological filter.

The utility model has the advantages that:

the utility model provides a layered upward flow double-layer structured biofilter, which aims at the problems that the conventional upward flow biofilter, whether a single-layer filter material filter pool or a double-layer or multi-layer filter material filter pool, accumulates different particle sizes or different types of filter materials as a whole in the same filter material layer, all the filter materials work under the same working condition and simultaneously enter a filtering or backwashing state, so that the backwashing efficiency is lower, the energy consumption is higher, the biomembrane falls off too much, and the like, the biofilter with the double-layer structure is characterized in that the filter material layer arranged in the biofilter is divided into an upper layer and a lower layer, a middle water collecting and distributing area is arranged between the upper layer filter material structure and the lower layer filter material structure, each filter material layer can be independently operated, the upper layer and the lower layer of filter material can be backwashed simultaneously, and only the filter material with the most serious lower layer blockage can be, therefore, the filter material with the most serious blockage at the lowest layer can be subjected to back washing, so that the back washing of the filter materials at the upper layer and the lower layer with different frequencies is realized, and the purposes of cleaning the filter material, retaining the active biological membrane and reducing the operation energy consumption are achieved. Compared with the conventional biological filter, the biological filter with the double-layer structure provided by the utility model is not only practical, but also improves the treatment efficiency, reduces the treatment cost and protects the environment.

Drawings

FIG. 1 is a schematic structural view of a layered upflow double-layer structured biofilter according to the present invention.

Shown in the figure: 1-a filter body, 101-a lower layer filter material structure, 101 a-a lower layer filter plate, 101 b-a first lower layer supporting layer, 101 c-a second lower layer supporting layer, 101 d-a lower layer filter material layer, 102-an upper layer filter material structure, 102 a-an upper layer filter plate, 102 b-a first upper layer supporting layer, 102 c-a second upper layer supporting layer, 102 d-an upper layer filter material layer, 103-a middle water collecting and distributing region, 2-a lower layer back washing water discharging pipe, 3-an upper layer back washing water inlet pipe, 4-an upper layer back washing air inlet pipe, 5-a lower layer aeration pipe, 6-an upper layer aeration pipe, 7-a sewage water inlet pipe, 8-a lower layer back washing water inlet pipe, 9-a lower layer back washing air inlet pipe, 10-an upper layer back washing water discharging pipe, 11-a purified water outlet pipe, 12-a perforated pipe, 13-control valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limiting the invention.

As shown in fig. 1, the embodiment provides a layered upflow double-layer structured biofilter, which includes a biofilter body 1, wherein a filter material layer is arranged inside the biofilter body 1, the filter material layer is arranged in an upper and lower layer structure, and is a lower layer filter material structure 101 arranged at the lower part inside the biofilter body 1 and an upper layer filter material structure 102 arranged at the upper part inside the biofilter body 1, and the upper and lower layer filter material structures can be operated independently; the filter is characterized in that a middle water collecting and distributing area 103 is arranged between the lower-layer filter material structure 101 and the upper-layer filter material structure 102, the height of the middle water collecting and distributing area 103 is 65% -75% of the thickness of the lower-layer filter material structure 101, a perforated pipe 12 used for exhausting air is arranged on the upper portion of the middle water collecting and distributing area 103, the other end of the perforated pipe 12 penetrates through the upper-layer filter material structure 102, a sewage inlet pipe 7 is arranged at the bottom of the filter body 1, and a purified water outlet pipe 11 is arranged at the top of the filter body 1.

Specifically, the lower-layer filter material structure 101 comprises a lower-layer filter plate 101a, a first lower-layer support layer 101b, a second lower-layer support layer 101c and a lower-layer filter material layer 101d, the lower-layer filter plate 101a is fixed on the side wall of the filter body 1, and the first lower-layer support layer 101b, the second lower-layer support layer 101c and the lower-layer filter material layer 101d are sequentially laid on the lower-layer filter plate 101 a; the lower-layer backwashing water inlet pipe 8 and the lower-layer backwashing air inlet pipe 9 of the lower-layer filter material structure 101 are arranged on one side of the filter tank body 1, and the lower-layer backwashing water outlet pipe 2 of the lower-layer filter material structure 101 is arranged on one side of the middle water collecting and distributing area 103; the lower aeration pipe 5 is disposed in the first lower supporting layer 101 b.

Specifically, the upper filter structure 102 includes an upper filter plate 102a, a first upper support layer 102b, a second upper support layer 102c, and an upper filter material layer 102d, the upper filter plate 102a is fixed on the side wall of the filter body 1, and the first upper support layer 102b, the second upper support layer 102c, and the upper filter material layer 102d are sequentially laid on the upper filter plate 102 a; an upper-layer backwashing water inlet pipe 3 and an upper-layer backwashing air inlet pipe 4 of the upper-layer filtering material structure 102 are arranged on one side of the middle water collecting and distributing area 103, and an upper-layer backwashing water outlet pipe 10 of the upper-layer filtering material structure 102 is arranged on one side of the top of the filter body 1; the upper aeration tube 6 is disposed in the first upper supporting layer 102 b.

Furthermore, filter heads are arranged on the lower filter plate 101a and the upper filter plate 102a, the first lower supporting layer 101b and the first upper supporting layer 102b are paved by pebbles, the particle size of the pebbles is 16-32 mm, the thickness of the pebble layer is 200mm, the second lower supporting layer 101c and the second upper supporting layer 102c are paved by pebbles, the particle size of the pebbles is 8-16 mm, the thickness of the pebble layer is 100mm, the lower filter material layer 101d and the upper filter material layer 102d are ceramsite filter materials, the particle size of the ceramsite filter materials is 3-5 mm, and the thickness of the ceramsite filter material layer is 1000-1500 mm.

Further, all air inlet, water inlet and water outlet pipe fittings of the double-layer structure biological filter of the embodiment are provided with control valves 13.

The application process of the layered upflow double-layer structured biofilter provided by the embodiment is as follows:

when the biological filter tank carries out a normal filtering process, the control valve 13, the upper aeration pipe 6 and the lower aeration pipe 5 on the sewage inlet pipe 7 and the water purification outlet pipe 11 are opened, sewage enters from the bottom of the filter tank body 1, sequentially passes through the lower filter plate 101a, the first lower supporting layer 101b, the second lower supporting layer 101c and the lower filter material layer 101d, enters the upper filter plate 102a, the first upper supporting layer 102b, the second upper supporting layer 102c and the upper filter material layer 102d, and finally, water is discharged from the water purification outlet pipe 11 at the top of the filter tank body 1.

After the operation for a period of time, the backwashing process is carried out, only the backwashing of the lower layer filter material structure 101 can be carried out firstly, the specific process is that the control valve 13 on the sewage inlet pipe 7 and the purified water outlet pipe 11, the upper layer aeration pipe 6 and the lower layer aeration pipe 5 are closed, meanwhile, all valves of the upper layer filter material structure 102 are also in a closed state, the backwashing process can be carried out by opening the lower layer backwashing air inlet pipe 9, the lower layer backwashing water inlet pipe 8 and the lower layer backwashing water outlet pipe 2 of the lower layer filter material structure 101 in sequence according to the backwashing time sequence, and the normal filtering state is recovered.

The upper filtering material structure 102 also needs to be backwashed after the operation for a long period of time, the lower filtering material structure 101 is backwashed before the upper filtering material structure 102 is backwashed, and the upper filtering material structure 102 is backwashed after the cycle is finished; the specific process is to keep the control valve 13 on the sewage inlet pipe 7 and the purified water outlet pipe 11, the upper aeration pipe 6 and the lower aeration pipe 5 in a closed state, simultaneously keep all valves of the lower filter material structure 101 in a closed state, sequentially open the upper backwash air inlet pipe 3, the upper backwash water inlet pipe 4 and the upper backwash water outlet pipe 10 of the upper filter material structure 102 according to the backwash time sequence to carry out the backwash process, and recover the normal filtration state after the washing cycle is finished.

The bilayer structure biological filter that above-mentioned embodiment provided can realize each layer independent operation through carrying out the layering to the filter material layer, and then can block up comparatively serious filter material to the lower floor and carry out the back flush and do not influence the upper filter material, reaches the purpose that has not only compromise clean filter material but also has remain active biomembrane, reduction operation energy consumption.

The parts not described in the specification are prior art or common general knowledge. The present embodiment is only used for illustrating the present invention, and is not used to limit the scope of the present invention, and modifications such as equivalent replacement made by those skilled in the art to the present invention are all considered to fall within the protection scope of the claims of the present invention.

Claims

1. The utility model provides a laminar upflow bilayer structure biological filter, includes filtering pond body (1), the inside of filtering pond body (1) is equipped with the precoat, its characterized in that: the filter material layer is divided into two layers and is respectively a lower layer filter material structure (101) arranged at the lower part in the filter tank body (1) and an upper layer filter material structure (102) arranged at the upper part in the filter tank body (1), a middle water collecting and distributing area (103) is arranged between the lower layer filter material structure (101) and the upper layer filter material structure (102), one side of the middle water collecting and distributing area (103) is provided with a lower layer back flush drain pipe (2) used for back flush drainage of the lower layer filter material structure (101), the other side of the middle water collecting and distributing area (103) is provided with an upper layer back flush water inlet pipe (3) and an upper layer back flush air inlet pipe (4) used for back flush inlet and inlet of the upper layer filter material structure (102), a lower layer aeration pipe (5) is arranged in the lower layer filter material structure (101), an upper layer aeration pipe (6) is arranged in the upper layer filter material structure (102), and a sewage inlet pipe (7) is arranged at one side of, the filter tank is characterized in that a lower-layer backwashing water inlet pipe (8) and a lower-layer backwashing air inlet pipe (9) which are used for backwashing water inlet and air inlet of a lower-layer filter material structure (101) are arranged on the other side of the filter tank body, an upper-layer backwashing water outlet pipe (10) which is used for backwashing water outlet of an upper-layer filter material structure (102) is arranged on one side of the top of the filter tank body (1), and a purified water outlet pipe.

2. A layered upflow double-deck biofilter according to claim 1, wherein: lower floor's filter material structure (101) include lower floor filter plate (101a), first lower floor support layer (101b), second lower floor support layer (101c) and lower floor filter material layer (101d), lower floor filter plate (101a) are fixed on the lateral wall of filtering pond body (1), first lower floor support layer (101b), second lower floor support layer (101c) and lower floor filter material layer (101d) are laid in proper order on lower floor filter plate (101 a).

3. A layered upflow double-deck biofilter according to claim 2, wherein: the upper-layer filter material structure (102) comprises an upper-layer filter plate (102a), a first upper-layer bearing layer (102b), a second upper-layer bearing layer (102c) and an upper-layer filter material layer (102d), the upper-layer filter plate (102a) is fixed on the side wall of the filter body (1), and the first upper-layer bearing layer (102b), the second upper-layer bearing layer (102c) and the upper-layer filter material layer (102d) are sequentially laid on the upper-layer filter plate (102 a).

4. A layered upflow double-deck biofilter according to claim 3, wherein: the filter head is arranged on each of the lower filter plate (101a) and the upper filter plate (102a), the first lower supporting layer (101b) and the first upper supporting layer (102b) are paved by pebbles, the particle sizes of the pebbles are 16-32 mm, the thicknesses of the pebbles are 200mm, the second lower supporting layer (101c) and the second upper supporting layer (102c) are paved by pebbles, the particle sizes of the pebbles are 8-16 mm, the thicknesses of the pebbles are 100mm, the lower filter material layer (101d) and the upper filter material layer (102d) are ceramsite filter materials, the particle sizes of the ceramsite filter materials are 3-5 mm, and the thicknesses of the ceramsite filter material layers are 1000-1500 mm.

5. A layered upflow double-deck biofilter according to claim 1, wherein: the height of the middle water collecting and distributing area (103) is 65% -75% of the thickness of the lower filter material structure (101), a perforated pipe (12) for exhausting air is arranged at the upper part of the middle water collecting and distributing area (103), and the other end of the perforated pipe (12) penetrates through the upper filter material structure (102).

6. A layered upflow double-deck biofilter according to any of claims 1 to 5, wherein: all air inlet, water inlet and water outlet pipe fittings of the biological filter are provided with control valves (13).