Filter tank

Abstract

The utility model provides a filter tank which comprises a tank body, and a filter plate, a supporting layer and a filter material layer are sequentially arranged in the tank body from bottom to top; a sewage inlet pipe and a backwashing water inlet pipe are arranged on the side wall of the lower part of the tank body and are positioned below the filter plate; a water outlet is formed in the side wall of the upper part of the tank body and is positioned above the filter material layer; a plurality of single-hole membrane air diffusers are arranged in the supporting layer, and the single-hole membrane air diffusers are distributed on the aeration pipe in a grid shape; a plurality of aerators are arranged in the filter material layer; the aerator comprises a spiral pipe body, and a plurality of groups of first aeration hole groups are formed in the spiral pipe body. According to the filter tank provided by the utility model, the filter material is fully contacted with oxygen, the utilization rate of the filter material is improved, and the backwashing interval time is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, and specifically relates to a filter tank. BACKGROUND

[0002] The aeration biological filter is a kind of high load fixed bed biological membrane reactor, and filtration interception and biological adsorption are integrated.The aeration pipe of the existing aeration biological filter is generally located below filter material layer, and the oxygen provided by the aeration pipe floats upwards to filter material layer, sewage passes through from below to above, and filter material layer carries out oxidation degradation to sewage.Because the position of filter material in filter material layer is fixed, the running path of oxygen is also fixed, cannot make filter material and oxygen fully contact, and the utilization rate of filter material is reduced.At the same time, when filter material is backwashed, partial filter material in filter material layer has not been fully oxidized and degraded, so that filter material backwash interval time is short, and production efficiency is reduced. SUMMARY

[0003] The utility model solves the technical problems that provide a kind of filter tank, make filter material and oxygen fully contact, improve the utilization rate of filter material, and prolong backwash interval time.

[0004] To solve the above technical problem, the utility model embodiment provides a kind of filter tank, including pool body, filter plate, supporting layer and filter material layer are sequentially equipped with in pool body from below to above;The lower part lateral wall of pool body is equipped with sewage inlet pipe and backwash inlet pipe, and sewage inlet pipe and backwash inlet pipe are located below filter plate;The upper lateral wall of pool body is equipped with water outlet, and water outlet is located above filter material layer;The supporting layer is equipped with a plurality of single-hole membrane air diffuser, and single-hole membrane air diffuser is grid-shaped and arranged on aeration pipe;Filter material layer is equipped with a plurality of aerators;The aeration device includes spiral pipe body, and a plurality of first aeration hole groups are arranged on the spiral pipe body.

[0005] As a further improvement of the utility model embodiment, the first aeration hole group includes a plurality of first aeration holes, and the first aeration holes are evenly distributed along the circumferential direction of the cross section of the spiral pipe body.

[0006] As a further improvement of the utility model embodiment, in each first aeration hole group, the center lines of all first aeration holes are located on the diameter of the cross section of the spiral pipe body.

[0007] As a further improvement of the utility model embodiment, in each first aeration hole group, the pore diameter of the first aeration hole located below the horizontal plane of the diameter of the cross section of the spiral pipe body is 150-250 μm.

[0008] As a further improvement of the utility model embodiment, in each first aeration hole group, the pore diameter of the first aeration hole located above the horizontal plane of the diameter of the cross section of the spiral pipe body is 80-120 μm.

[0009] As a further improvement of the embodiment of the utility model, the aerator further comprises a first straight pipe, the first straight pipe is arranged at the bottom end of the spiral pipe body and communicates with the spiral pipe body, and the first straight pipe of all aerators communicates with the air inlet pipe.

[0010] As a further improvement of the embodiment of the utility model, the air volume of the air inlet pipe is 1 / 6-1 / 3 of the air volume of the aeration pipe.

[0011] As a further improvement of the embodiment of the utility model, the aerator further comprises a second straight pipe, the second straight pipe is arranged at the top end of the spiral pipe body and communicates with the spiral pipe body, and a plurality of second aeration hole groups are arranged on the second straight pipe.

[0012] As a further improvement of the embodiment of the utility model, the second aeration hole group comprises a plurality of second aeration holes, and the second aeration holes are uniformly distributed along the circumferential direction of the section of the second straight pipe.

[0013] As a further improvement of the embodiment of the utility model, the diameter of the second aeration hole is 80-120 mu m.

[0014] Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

[0015] The filter tank provided by the embodiment of the utility model sprays air moving from bottom to top through the single-hole membrane air diffuser, sprays air in different directions at different heights in the filter layer through the aerator, air interacts, adjusts the running path of air, the inclination angle and position of filter material, carries out three-dimensional oxygen dissolving process, makes the filter material fully contact with oxygen, improves the utilization rate of filter material, improves the oxidation and degradation effect on sewage, and prolongs the interval time of backwashing. During backwashing, the filter material is backwashed in multiple directions, the position and inclination angle of the filter material are constantly changed, and the backwashing effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the structural schematic view of the filter tank of the embodiment of the utility model;

[0017] Figure 2 is Figure 1 the structural schematic view of the aerator in the embodiment of the utility model;

[0018] Figure 3 is Figure 2 the sectional view of the spiral pipe body.

[0019] The figure shows: sewage inlet pipe 1, backwash inlet pipe 2, air inlet pipe 3, aeration pipe 4, aerator 5, first straight pipe 51, spiral tube body 52, first aeration hole group 53, first aeration hole 531, second straight pipe 54, second aeration hole group 55, filter material 6, tank body 7, pipe gallery 71, filter material layer 72, water outlet area 73, supporting layer 8, filter plate 9, and filter head 10. DETAILED DESCRIPTION

[0020] The technical solution of the present utility model is described in detail below with reference to the accompanying drawings.

[0021] The present invention provides a filter tank, such as Figure 1 As shown, the tank body 7 includes a filter plate 9, a support layer 8, and a filter material layer 72. The filter plate 9 is located at the bottom, and a filter head 10 is provided on the filter plate 9. The filter head performs preliminary filtration on the sewage to improve the filtration effect of the filter tank. The support layer 8 is provided above the filter plate 9. The support layer 8 is made of pebbles with certain mechanical strength and good chemical stability, and is arranged in a certain grade. The filter material layer 72 is provided above the support layer 8. The filter material 6 in the filter material layer is made of plastic particles with high porosity, large specific surface area, strong biological adhesion, and low density to enhance oxidative degradation. Below the filter plate 9 in the tank body 7 is a pipe gallery 71. The side walls of the pipe gallery 71 are provided with a sewage inlet pipe 1 and a backwash inlet pipe 2. Preferably, the sewage inlet pipe 1 is provided with a first regulating valve for adjusting the fluid flow entering the filter tank. The backwash inlet pipe 2 is located above the sewage inlet pipe 1 and is provided with a second regulating valve for adjusting the flow and pressure of the backwash water. Above the filter material layer in the pool body 7 is a water outlet area 73 , and a water outlet is provided on the side wall of the water outlet area 73 .

[0022] The support layer 8 is equipped with several single-porous membrane air diffusers, arranged in a grid pattern on the aeration tubes 4. These diffusers are connected to the aeration tubes 4. When air at a certain pressure is introduced into the aeration tubes 4, the air passes through the diffusers and aerates upward within the support layer, oxidizing and degrading the wastewater within the filter layer. A third regulating valve is located at the inlet of the aeration tubes 4 to adjust the upward aeration and backwashing effects.

[0023] Several aerators 5 are provided in the filter material layer 72. Figure 2 As shown, the aerator 5 includes a spiral tube body 52, which is provided with a plurality of first aeration hole groups 53. Air at a certain pressure flows into the spiral tube body 52 and is ejected at high speed from the first aeration hole groups. The number of aerators 5 is determined by the size of the pool.

[0024] Preferably, the first aeration hole group 53 includes a plurality of first aeration holes 531, such as Figure 3As shown, the first aeration holes are evenly distributed along the circumference of the spiral pipe body 52 section. In each group of first aeration hole groups 53, the center lines of all the first aeration holes are located on the diameter of the spiral pipe body section. The air in the spiral pipe body is injected radially to the surrounding through the first aeration hole groups on the sections at different positions of the spiral pipe body. The air injected in different directions by all the first aeration hole groups of the entire spiral pipe body interacts with each other, enhancing the mixing and cutting effect, making the water droplets and bubbles become finer and more fine, and transferring more oxygen to the water.

[0025] In each group of first aeration hole groups 53, the first aeration holes located below the horizontal plane passing through the diameter of the spiral pipe body 52 section inject air downward and obliquely downward to aerate and oxygenate the water body and filter material below. In each group of first aeration hole groups 53, the first aeration holes located above the horizontal plane passing through the diameter of the spiral pipe body 52 section inject air upward and obliquely upward to aerate and oxygenate the water body and filter material above. In each group of first aeration hole groups 53, the first aeration holes located on the horizontal plane passing through the diameter of the spiral pipe body 52 section inject air outward (away from the axis of the spiral pipe body) and inward (toward the axis of the spiral pipe body) to aerate and oxygenate the water body and filter material outside and inside the spiral pipe body.

[0026] Preferably, in each group of first aeration hole groups 53, the first aeration holes located below the horizontal plane passing through the diameter of the spiral pipe body 52 section have a hole diameter of 150-250 μm, and the first aeration holes located above the horizontal plane passing through the diameter of the spiral pipe body 52 section have a hole diameter of 80-120 μm. The first aeration holes for downward and obliquely downward aeration have a larger hole diameter, producing very small diameter bubbles that are injected at high speed downward and obliquely downward to the surrounding water body and filter material, aerating and oxygenating the external water body and filter material. The first aeration holes for upward and obliquely upward aeration have a smaller hole diameter, producing smaller diameter but faster speed bubbles that are injected at high speed upward and obliquely upward to the surrounding water body and filter material, aerating and oxygenating the external water body and filter material.

[0027] The first aeration holes on different cross sections of the spiral pipe body spray air at different heights and different directions to form a water-air mixture in the filter material layer, which provides oxygen for the water body and the filter material, cuts and merges with each other, realizes cutting and merging of the water-air mixture in the entire three-dimensional space in the filter material layer, makes the water droplets and air bubbles finer and more dense, and transfers more oxygen to the water. The water-air mixture sprayed at different heights and different circumferential directions is a three-dimensional water-air mixture (the spraying direction changes constantly with the change of height), which improves the oxygen transfer efficiency of the sewage and the filter material. Since the filter material in the filter material layer is a polyhedral particle, the air passes through the filter material from different heights, different directions and different angles, the contact surface between the air and the filter material changes from single side contact (the existing technology has a single flow direction, the utilization rate of the filter material decreases, the biological oxidation of the filter material is uneven, and the oxidation and degradation effect on the sewage is reduced) to three-dimensional contact, and the contact surface changes from single contact to multi-surface contact. The contact area of the air with different surfaces of the filter material is increased, so the opportunity for the pollutants in the sewage to be intercepted by the filter material layer is increased, and the biological degradation and conversion efficiency of the microorganisms attached to the filter material is increased. At the same time, the probability of removing the dissolved organic matter is improved; the air moving in multiple directions and multiple positions forms different angles with the air moving upward, interacts and collides with the water-air mixture in different directions, cuts the air bubbles into finer and smaller ones, so that more oxygen is transferred to the sewage to improve the degradation and conversion efficiency of the sewage; the air moving in multiple directions interacts with the air and the sewage moving upward, constantly changes the movement path and direction of the air and the sewage, and increases the efficiency of sewage treatment. At the same time, since the filter material is a polyhedron, the contact area and path of the sewage and the filter material are increased, the opportunity for the pollutants in the sewage to be intercepted by the filter material layer is increased again, the biological degradation and conversion of the sewage by the microorganisms attached to the filter material are increased, and the probability of removing the dissolved organic matter and specific substances is improved; the combined action of the air sprayed in multiple directions and the air sprayed upward changes the position and angle of some filter materials constantly, so the contact area of the sewage and the filter material is increased, the utilization rate of the filter material is improved, the opportunity for the pollutants in the sewage to be intercepted by the filter material layer is increased, and the biological degradation and conversion of the sewage by the microorganisms attached to the filter material and the removal probability of the dissolved organic matter are increased.

[0028] Preferably, as shown in Figure 2 The aeration device 5 further comprises a first straight pipe 51 arranged at the bottom end of the spiral pipe body 52 and communicating with the spiral pipe body. The first straight pipes 51 of all aeration devices 5 pass through the supporting layer and communicate with the air inlet pipe 3 located below the filter plate. The air inlet pipe 3 is provided with a fourth adjusting valve for adjusting the air flow entering the aeration device 5, so as to control the three-dimensional aeration effect and treatment effect in the entire filter layer.

[0029] The air flow of the air inlet pipe 3 is preferably 1 / 6-1 / 3 of the air flow of the air outlet pipe 4. The air flow from the bottom to the top is the main aeration process, and the three-dimensional aeration in the filter material area is the auxiliary aeration process.

[0030] Preferably, as shown in FIG. 1, the air diffuser 5 further comprises a second straight pipe 54 arranged at the top end of the spiral pipe body 52 and in communication with the spiral pipe body 52. The second straight pipe 54 is provided with a plurality of second air outlet hole groups 55. Each second air outlet hole group 55 comprises a plurality of second air outlet holes uniformly distributed along the circumference of the cross section of the second straight pipe 54. Air with a certain pressure flows into the second straight pipe and is jetted horizontally in all directions through the second air outlet hole groups at different heights of the cross section of the second straight pipe, thereby further improving the oxygen dissolving effect in the filter material layer. Figure 2

[0031] Preferably, the diameter of the second air outlet hole is 80-120 μm. The diameter of the second air outlet hole is small, the jetting speed of the air is high, and the jetting effect in all directions is good. The air containing the mixture of water and air and the filter material around the second air outlet hole are jetted, thereby improving the oxygen transfer efficiency and the ability of the filter material layer to oxidize and degrade the wastewater in the horizontal direction.

[0032] The working process of the filter tank of the above embodiment is as follows:

[0033] During the wastewater treatment, the backwashing inlet pipe 2 is closed, the first adjusting valve on the wastewater inlet pipe 1 is opened, and the outlet is opened. The wastewater enters the tank body through the wastewater inlet pipe. The fourth adjusting valve on the air inlet pipe 3 and the third adjusting valve on the air outlet pipe 4 are opened, and the air flow into the air inlet pipe 3 and the air outlet pipe 4 is adjusted.

[0034] ​The sewage moves from bottom to top in the pool body, and sequentially passes through the filter plate, the supporting layer and the filter material layer. The air sprayed by the single-hole membrane air diffuser moves from bottom to top. The spiral pipe body of the aerator 5 sprays air at different heights and in different directions, and the air in different directions interacts with each other and with the air moving upward. The second straight pipe sprays air horizontally at different heights above the spiral pipe body, and the air interacts with the air moving upward. Since the filter material in the filter material layer is a polyhedral particle, the air passes through the filter material from different heights, different directions and different angles, and the contact surface between the air and the filter material is converted from a single side surface contact (the prior art has a single flow direction, the utilization rate of the filter material is reduced, the biological oxidation of the filter material is unbalanced, and the oxidation and degradation effect on the sewage is reduced) to a three-dimensional contact, and the contact surface is converted from a single contact surface to a multi-surface contact. The contact area of the air with different surfaces of the filter material is increased, so that the opportunity for the pollutants in the sewage to be intercepted by the filter material layer is increased, and the biological degradation and conversion efficiency of the pollutants attached to the filter material is increased. At the same time, the probability of removing the dissolved organic matter is increased; the air moving in multiple directions forms different angles with the air moving from bottom to top, so that the air-water mixture in different directions interacts and collides, the bubbles are cut into finer and smaller bubbles, more oxygen is transferred to the sewage, and the degradation and conversion efficiency on the sewage is improved; the air moving in multiple directions interacts with the air and the sewage moving upward, constantly changes the movement path and direction of the air and the sewage, and increases the efficiency of the sewage treatment. At the same time, since the filter material is a polyhedron, the contact area and path of the sewage and the filter material are increased, the opportunity for the pollutants in the sewage to be intercepted by the filter material layer is increased again, the biological degradation and conversion of the sewage by the filter material attached to the filter material is increased, and the probability of removing the dissolved organic matter and specific substances is increased; the combined action of the air sprayed in multiple directions and the air sprayed upward changes the position and angle of some filter materials constantly, so that the contact area of the sewage and the filter material is increased, the utilization rate of the filter material is increased, the opportunity for the pollutants in the sewage to be intercepted by the filter material layer is increased, and the biological degradation and conversion of the pollutants attached to the filter material and the removal probability of the dissolved organic matter are increased.

[0035] The fluid passing through the filter material layer flows out through the water outlet.

[0036] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above specific embodiments, and the description in the above specific embodiments and the description in the specification are only for further illustration of the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the claims and their equivalents.

Claims

1. A filter basin characterized in that, The application relates to a sewage treatment device, which comprises a pool body (7), a filter plate (9), a supporting layer (8) and a filter material layer (72) arranged in the pool body (7) from bottom to top; a sewage inlet pipe (1) and a backwashing inlet pipe (2) are arranged on the lower sidewall of the pool body (7) and are located below the filter plate (9); a water outlet is arranged on the upper sidewall of the pool body (7) and is located above the filter material layer (72); a plurality of single-hole membrane air diffusers are arranged in the supporting layer (8) and are arranged on an aeration pipe (4) in a grid shape; a plurality of aerators (5) are arranged in the filter material layer (72); the aeration pipe (5) comprises a spiral pipe body (52), and a plurality of first aeration hole groups (53) are arranged on the spiral pipe body (52).

2. The filter cell of claim 1, wherein The first aeration hole group (53) comprises a plurality of first aeration holes (531) which are uniformly distributed along the circumferential direction of the cross section of the spiral pipe body (52).

3. The filter cell of claim 2, wherein, In each first aeration hole group (53), the center lines of all the first aeration holes (531) are located on the diameter of the cross section of the spiral pipe body.

4. The filter cell of claim 2, wherein, In each first aeration hole group (53), the aperture of the first aeration hole (531) located below the horizontal plane of the diameter of the cross section of the spiral pipe body (52) is 150-250 mu m.

5. The filter cell of claim 2, wherein, In each first aeration hole group (53), the aperture of the first aeration hole (531) located above the horizontal plane of the diameter of the cross section of the spiral pipe body (52) is 80-120 mu m.

6. The filter cell of claim 1, wherein The aeration pipe (5) further comprises a first straight pipe (51) which is arranged at the bottom end of the spiral pipe body (52) and communicates with the spiral pipe body (52); the first straight pipes (51) of all the aerators (5) communicate with an air inlet pipe (3).

7. The filter cell of claim 6, wherein, The air volume of the air inlet pipe (3) is 1 / 6-1 / 3 of the air volume of the aeration pipe (4).

8. The filter cell of claim 1, wherein, The aeration pipe (5) further comprises a second straight pipe (54) which is arranged at the top end of the spiral pipe body (52) and communicates with the spiral pipe body (52); a plurality of second aeration hole groups (55) are arranged on the second straight pipe (54).

9. The filter cell of claim 8, wherein, The second aeration hole group (55) comprises a plurality of second aeration holes which are uniformly distributed along the circumferential direction of the cross section of the second straight pipe (54).

10. The filter cell of claim 8, wherein, The aperture of the second aeration hole is 80-120 mu m.

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