CN212833346U - Small-size rural domestic sewage anaerobic digestion processing apparatus - Google Patents

Abstract

The utility model provides a small-size rural domestic sewage anaerobic digestion processing apparatus, include: the garbage interception box, the first anaerobic bin, the second anaerobic bin, the sedimentation box and the filter box are sequentially communicated; the garbage intercepting box is connected with a water inlet pipe and a PH detector, and stirring devices are arranged in the first anaerobic bin and the second anaerobic bin. The utility model can intercept larger garbage in the sewage by arranging the garbage intercepting box, prevent the garbage from entering the first anaerobic bin and the second anaerobic bin, treat the sewage by anaerobic digestion in the first anaerobic bin and the second anaerobic bin, and discharge the treated sewage after precipitation by the settling tank and filtration by the filter box; install the PH detector on the rubbish interception case, the PH of real-time supervision waste water to avoid waste water PH to handle improperly and lead to anaerobic microorganisms to inactivate, guarantee anaerobic digestion's effect, the utility model discloses a rural domestic sewage anaerobic digestion handles, and simple structure, practical convenient.

Description

Small-size rural domestic sewage anaerobic digestion processing apparatus

Technical Field

The utility model relates to a sewage purification technical field especially relates to a small-size rural domestic sewage anaerobic digestion processing apparatus.

Background

Domestic sewage is wastewater discharged in daily life of residents and mainly comes from residential buildings and public buildings, such as houses, institutions, schools, hospitals, shops, public places, industrial enterprise toilets and the like; the pollutants contained in the domestic sewage are mainly organic matters (such as protein, carbohydrate, fat, urea, ammonia nitrogen and the like) and a large amount of pathogenic microorganisms (such as parasitic ova, enteroinfectious viruses and the like); organic matters existing in domestic sewage are extremely unstable and easily decomposed to generate offensive odor. Bacteria and pathogens propagate in large quantities by taking organic matters in domestic sewage as nutrition, so that infectious diseases can be spread and epidemic; therefore, domestic sewage must be treated before being discharged.

The existing sewage anaerobic digestion treatment device is mostly used for treating huge industrial wastewater, is not suitable for treating rural domestic sewage with small scale, can not intercept the domestic garbage leaked and cleaned in the sewage during treatment, is easy to cause pipeline blockage or reduce sewage treatment effect, and the wastewater after anaerobic digestion treatment is not sufficiently filtered; because anaerobic microorganisms are influenced by PH, the PH of the wastewater should be monitored in real time so as to prevent the inactivation of the anaerobic microorganisms caused by improper PH treatment of the wastewater, and in order to improve the anaerobic digestion effect, the wastewater needs to be fully stirred, so that a small rural domestic sewage anaerobic digestion treatment device is needed.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a small rural domestic sewage anaerobic digestion treatment device which can better realize the rural domestic sewage anaerobic digestion treatment.

The utility model provides a small-size rural domestic sewage anaerobic digestion processing apparatus, include: the garbage interception box, the first anaerobic bin, the second anaerobic bin, the sedimentation box and the filter box are sequentially communicated; the garbage intercepting box is connected with a water inlet pipe and a PH detector, and stirring devices are arranged in the first anaerobic bin and the second anaerobic bin. The utility model can intercept larger garbage in the sewage by arranging the garbage intercepting box, prevent the garbage from entering the first anaerobic bin and the second anaerobic bin, treat the sewage by anaerobic digestion in the first anaerobic bin and the second anaerobic bin, and discharge the treated sewage after precipitation by the settling tank and filtration by the filter box; install the PH detector on the rubbish interception case, the PH of real-time supervision waste water to avoid waste water PH to handle improperly and lead to anaerobic microorganisms to inactivate, guarantee anaerobic digestion's effect, the utility model discloses a rural domestic sewage anaerobic digestion handles, and simple structure, practical convenient.

Further, the stirring device comprises a motor, a rotating shaft, a stirring blade and a sealing ring; the motor is connected on the bulkhead in first anaerobic storehouse and second anaerobic storehouse, the pivot with the stirring leaf is arranged in first anaerobic storehouse and the second anaerobic storehouse, just the stirring leaf is connected in the pivot, the output shaft of motor passes the bulkhead with the pivot drive is connected, the output shaft of motor with be provided with between the bulkhead the sealing washer.

Further, the motor is connected to the upper sides of the first and second anaerobic chambers.

Furthermore, the first anaerobic bin and the second anaerobic bin are integrally connected, and a sludge plate and a filter screen are arranged on one side of an outflow port of each of the first anaerobic bin and the second anaerobic bin; the mud board sets up first anaerobic storehouse with the well lower part in second anaerobic storehouse, the filter screen distributes in whole egress opening within range, in the direction that rivers go out, the filter screen is located the rear side of mud board, just the mud board with form the cavity between the filter screen.

Furthermore, the sludge plate and the filter screen are connected in a floor frame matched with the shapes of the outflow ports of the first anaerobic bin and the second anaerobic bin; the top surfaces of the first anaerobic bin and the second anaerobic bin are provided with plate grooves corresponding to the plate frames, and the plate frames are detachably connected in the plate grooves.

Furthermore, anaerobic bacteria filling bottles are connected to the walls of the first anaerobic bin and the second anaerobic bin.

Furthermore, an L-shaped filter plate is arranged in the garbage intercepting box at a position corresponding to the outlet of the garbage intercepting box.

Furthermore, a water inlet of the settling tank is communicated with the second anaerobic bin through a connecting pipe, a first settling area and a second settling area are respectively arranged in the settling tank from front to back along the direction of water flow in the tank body at the lower side part of the water inlet of the settling tank, and the density of the first settling area is smaller than that of the second settling area; a partition plate is fixedly connected to the top surface of the settling tank at a position corresponding to the interface of the first settling zone and the second settling zone, and the partition plate is vertically inserted into the interface; the water outlet of the settling tank is positioned at one side close to the second settling zone, and the position of the water outlet of the settling tank on the settling tank is as high as the position of the water inlet of the settling tank on the settling tank.

Furthermore, the upper part of the filter box is communicated with the settling box through a connecting pipe, the lower part of the filter box is connected with a water outlet, and a flow meter is connected to the water outlet.

Further, in the filter box, along the direction of rivers, from top to bottom have connected gradually third filter, second filter and first filter, the filtration density of third filter, second filter and first filter increases in proper order.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a small rural domestic sewage anaerobic digestion treatment device;

FIG. 2 shows a schematic view of a sludge plate;

FIG. 3 is a schematic view of a stirring apparatus;

FIG. 4 is a schematic view of a settling tank;

FIG. 5 is a schematic view of a filter box;

FIG. 6 is a schematic view of an intercepting box

In the drawings are labeled:

1. a trash holding bin; 2. a first anaerobic chamber; 3. a second anaerobic chamber; 4. a settling tank; 5. a filter box; 6. a water inlet pipe; 7. a connecting pipe; 8. a sludge plate; 9. filtering with a screen; 10. a motor; 11. a rotating shaft; 12. stirring blades; 13. a seal ring; 14. a pH detector; 15. anaerobic bacteria filler bottles; 16. a first filter plate; 17. a water outlet; 18. a flow meter; 19. an L-shaped filter plate; 20. a partition plate; 21. a first settling zone; 22. a second precipitation zone; 23. a third filter plate; 24. a second filter plate.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment of the utility model provides a small-size rural domestic sewage anaerobic digestion processing apparatus, as shown in figure 1, include: the garbage intercepting box 1, the first anaerobic bin 2, the second anaerobic bin 3, the settling tank 4 and the filter tank 5 are communicated in sequence; the garbage intercepting box 1 is connected with a water inlet pipe 6 and a PH detector 14, and stirring devices are arranged in the first anaerobic bin 2 and the second anaerobic bin 3. The utility model can intercept larger garbage in sewage by arranging the garbage intercepting box 1, prevent the garbage from entering the first anaerobic bin 2 and the second anaerobic bin 3, treat sewage by anaerobic digestion in the first anaerobic bin 1 and the second anaerobic bin 2, and the arrangement of the stirring device is favorable for making the mixing of anaerobic microorganisms and wastewater more uniform, and the treated sewage is precipitated by the precipitation box 4 and is discharged after being filtered by the filtering box 5; install PH detector 14 on rubbish interception case 1, the PH of real-time supervision waste water to avoid waste water PH to handle improperly and lead to anaerobic microorganisms to inactivate, guarantee anaerobic digestion's effect, the utility model discloses a rural domestic sewage anaerobic digestion handles, and simple structure, practical convenient.

Preferably, as shown in fig. 3, the stirring device comprises a motor 10, a rotating shaft 11, a stirring blade 12 and a sealing ring 13; the motor 10 is connected on the bulkhead of first anaerobic storehouse 2 and second anaerobic storehouse 3, pivot 11 with stirring leaf 12 is arranged in first anaerobic storehouse 2 and the second anaerobic storehouse 3, just stirring leaf 12 is connected on the pivot 11, the output shaft of motor 10 passes the bulkhead with pivot 11 drive is connected, the output shaft of motor 10 with be provided with between the bulkhead sealing washer 13. Wherein, the blade shape of stirring leaf 12 can be parallel leaf, also can be the spiral leaf, can both play the same stirring and mix the effect, and the setting of sealing washer 13 plays sealed effect, avoids the external gas to enter into first anaerobic storehouse 2 and second anaerobic storehouse 3, disturbs anaerobic bacteria's digestion effect. Further preferably, the motor 10 is connected to the upper sides of the first anaerobic chamber 2 and the second anaerobic chamber 3, the upper portions of the first anaerobic chamber 2 and the second anaerobic chamber 3 are planes, the weight of the motor 10 can be better borne, and the output shaft of the motor 10 extends downwards into the first anaerobic chamber 2 and the second anaerobic chamber 3 from the upper side, so that the motor is more conveniently connected with the rotating shaft 11, and a good stirring effect is achieved.

Wherein, anaerobic bacteria filler bottles 15 are connected on the walls of the first anaerobic bin 2 and the second anaerobic bin 3. Preferably, the anaerobic bacteria filler bottle 15 is arranged on the upper sides of the first anaerobic bin 2 and the second anaerobic bin 3, on one hand, the upper parts of the first anaerobic bin 2 and the second anaerobic bin 3 are flat, so that the weight of the anaerobic bacteria filler bottle 15 can be better borne; on the other hand, the anaerobic bacteria strain can fall into the first anaerobic bin 2 and the second anaerobic bin 3 from the upper side, and the surface sewage flows back into the anaerobic bacteria filling bottle 15.

In one aspect of the embodiment of the present invention, the first anaerobic chamber 2 and the second anaerobic chamber 3 are integrally connected, and a sludge plate 8 and a filter screen 9 are disposed at one side of the outlet of the first anaerobic chamber 2 and one side of the outlet of the second anaerobic chamber 3; the mud plate 8 sets up first anaerobic storehouse 2 with the well lower part in second anaerobic storehouse 3, filter screen 9 distributes in whole egress opening within range, in the direction that rivers go out, filter screen 9 is located the rear side of mud plate 8, just mud plate 8 with form the cavity between the filter screen 9. Through setting up mud board 8, when the waste water through processing flows out in first anaerobic storehouse 2 and second anaerobic storehouse 3, filter screen 9 can filter mud to the cavity between mud board 8 and the filter screen 9 is favorable to buffering sewage, and then stays mud inside the cavity, makes the clearance more convenient.

Preferably, as shown in fig. 2, the sludge plate 8 and the filter screen 9 are both connected in a plate frame matched with the shapes of the outflow ports of the first anaerobic chamber 2 and the second anaerobic chamber 3; the top surfaces of the first anaerobic bin 2 and the second anaerobic bin 3 are provided with plate grooves corresponding to the plate frames, and the plate frames are detachably connected in the plate grooves. Through the setting of sheet frame and board groove, can conveniently get and put mud board 8 and filter screen 9, do benefit to and clear away the mud in the cavity.

In one aspect of the embodiment of the present invention, as shown in fig. 6, an L-shaped filter plate 19 is disposed inside the trash holding box 1 at a position corresponding to the outflow port thereof. The L-shaped filter plates 19 prevent the waste from entering the first anaerobic chamber 2 and the second anaerobic chamber 3, thereby reducing the effect of more waste on anaerobic digestion.

In one aspect of the embodiment of the present invention, as shown in fig. 4, the water inlet of the settling tank 4 is communicated with the second anaerobic chamber 3 through a connecting pipe 7, a first settling zone 21 and a second settling zone 22 are respectively arranged in the box body of the settling tank 4 at the lower side part of the water inlet of the settling tank 4 from front to back along the direction of water flow, and the density of the first settling zone 21 is less than that of the second settling zone 22; a partition plate 20 is fixedly connected to the top surface of the settling tank 4 at a position corresponding to the interface of the first settling zone 21 and the second settling zone 22, and the partition plate 20 is vertically inserted into the interface; the water outlet of the settling tank 4 is positioned at one side close to the second settling zone 22, and the position of the water outlet of the settling tank 4 on the settling tank 4 is equal to the position of the water inlet of the settling tank 4 on the settling tank 4. During the use, behind the mud of the great majority in sewage is filtered, comparatively tiny mud can be along with sewage under baffle 20's effect in the sewage, at first get into first settling zone 21 inside, then sewage oozes first settling zone 21 and gets into second settling zone 22, after first settling zone 21 and the inside sewage that is full of second settling zone 22, unnecessary sewage can flow through the egress opening of second settling zone 22 upper end, plays the effect of removing the mud in the sewage.

In an aspect of the embodiment of the present invention, as shown in fig. 5, in the filter box 5, along the direction of the water flow, the third filter 23, the second filter 24 and the first filter 16 are sequentially connected from top to bottom, and the filtering density of the third filter 23, the second filter 24 and the first filter 16 is sequentially increased. Through the setting of rose box 5, can carry out fine filtration and absorption with the mud that is more for the fineness in the sewage, and then make sewage treatment effect better.

In one aspect of the embodiment of the present invention, the upper portion of the filtering box 5 is connected to the settling box 4 through the connecting pipe 7, the lower portion of the filtering box 5 is connected to the water outlet 17, and the water outlet 17 is connected to the flowmeter 18. By arranging the flowmeter 18, the flow rate of sewage treatment can be counted according to the measurement of the flowmeter 18.

When the utility model is used specifically, the sewage drainage pipe is connected with the garbage interception box 1 through the water inlet pipe 6, then the PH detector 14 is started, sewage enters the garbage interception box 1 through the water inlet pipe 6, the PH detector 14 can detect the PH of the sewage, anaerobic digestion treatment can not be carried out when the PH of the sewage does not meet the standard, and then the working environment of anaerobic microorganisms can be detected, and the problem of unqualified sewage treatment caused by unqualified PH of the sewage can be prevented; and prevent the rubbish from entering the first anaerobic bin 2 and the second anaerobic bin 3 under the action of the L-shaped filter plate 19 in the rubbish intercepting box 1, and then reduce the influence of more rubbish on anaerobic digestion, then the waste water enters the first anaerobic bin 2, anaerobic microorganisms can be filled in the anaerobic bacteria filler bottle 15, then the motor 10 is started, the rotating shaft 11 is rotated under the action of the motor 10, and then the stirring blade 12 outside the rotating shaft 11 is driven to stir the waste water, so that the anaerobic microorganisms and the waste water are mixed more uniformly, and further the anaerobic digestion rate of the waste water is improved, then the waste water enters the second anaerobic bin 3 through the sludge plate 8 and the filter screen 9, the filter screen 9 can filter the sludge, and the cavity at the lower end of the filter screen 9 is beneficial to buffering the waste water, and then the sludge is left in the cavity, so that the cleaning is more convenient, the waste water is also stirred after entering the first anaerobic bin 2, then the sewage passes through the sludge plate 8 and the filter screen 9, and enters the interior of the settling tank 4 through the connecting pipe 7, after most of the sludge in the sewage is filtered, the sludge with smaller types of sewage firstly enters the first settling zone 21 along with the sewage under the action of the partition plate 20, then the sewage permeates the first settling zone 21 to enter the second settling zone 22, after the first settling zone 21 and the second settling zone 22 are filled with the sewage, the redundant sewage flows to the filter tank 5 through the connecting pipe 7 at the upper end of the second settling zone 22, the inside of the filter tank 5 is provided with the third filter plate 23, the second filter plate 24 and the first filter plate 16, the filtering density of the third filter plate 23, the second filter plate 24 and the first filter plate 16 is gradually increased, the sludge with smaller types in the sewage can be well filtered and adsorbed, the sewage treatment effect is better, and the measurement by the flowmeter 18 can be realized, further, the flow of sewage treatment can be counted.

To sum up, the utility model discloses following beneficial effect has:

can form a small-size sewage anaerobic digestion processing apparatus through setting up rubbish interception case 1, first anaerobic storehouse 2, second anaerobic storehouse 3, setting tank 4 and rose box 5, be convenient for handle the domestic sewage in the daily life, because its size is less, so it is more convenient to use, and application range is more extensive.

The garbage intercepting box 1 is arranged, large garbage which is leaked to be cleaned in sewage can be intercepted, the garbage is prevented from entering the first anaerobic bin 2 and the second anaerobic bin 3 under the action of the L-shaped filter plate 19 in the garbage intercepting box 1, the influence of the large garbage on anaerobic digestion is further reduced, the rotating shaft 11 is rotated under the action of the motor 10 through the arrangement of the motor 10 and the stirring blade 12, the stirring blade 12 on the outer side of the rotating shaft 11 is further driven to stir the waste water, anaerobic microorganisms and the waste water are mixed more uniformly, and the anaerobic digestion rate of the waste water is further improved; through setting up mud board 8 and filter screen 9, when the waste water of processing and then second anaerobic storehouse 3 in first anaerobic storehouse 2, filter screen 9 can filter mud to the cavity of filter screen 9 lower extreme is favorable to sewage to be cushioned, and then stays mud inside the cavity, makes the clearance more convenient.

By arranging the settling tank 4, after most of sludge in the sewage is filtered, the sludge with smaller size can firstly enter the first settling zone 21 along with the sewage under the action of the partition plate 20, then the sewage permeates through the first settling zone 21 and enters the second settling zone 22, and after the interiors of the first settling zone 21 and the second settling zone 22 are filled with the sewage, the excess sewage flows to the filtering tank 5 through the connection pipe 7 at the upper end of the second settling zone 22, by arranging the filter box 5, the sewage flowing out of the interior of the settling box 4 is filtered, the interior of the filter box 5 is provided with a third filter plate 23, a second filter plate 24 and a first filter plate 16, and the filtering densities of the third filter plates 23, the second filter plates 24 and the first filter plates 16 are gradually increased, can carry out fine filtration and absorption with the sludge that is finer in the sewage, and then make sewage treatment effect better.

Through setting up PH detector 14, can detect the PH of sewage, can not carry out anaerobic digestion when the PH of sewage is not conform to the standard and handles, and then can detect anaerobic microorganisms's operational environment, can prevent the unqualified problem of sewage treatment because sewage PH is unqualified and cause, through setting up flowmeter 18, can be according to the measurement of flowmeter, and then can make statistics of out sewage treatment's flow.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A small rural domestic sewage anaerobic digestion processing apparatus, characterized by that, includes:

the garbage interception box, the first anaerobic bin, the second anaerobic bin, the sedimentation box and the filter box are sequentially communicated;

the garbage intercepting box is connected with a water inlet pipe and a PH detector, and stirring devices are arranged in the first anaerobic bin and the second anaerobic bin.

2. The small rural domestic sewage anaerobic digestion treatment device of claim 1,

the stirring device comprises a motor, a rotating shaft, a stirring blade and a sealing ring;

the motor is connected on the bulkhead in first anaerobic storehouse and second anaerobic storehouse, the pivot with the stirring leaf is arranged in first anaerobic storehouse and the second anaerobic storehouse, just the stirring leaf is connected in the pivot, the output shaft of motor passes the bulkhead with the pivot drive is connected, the output shaft of motor with be provided with between the bulkhead the sealing washer.

3. The small rural domestic sewage anaerobic digestion treatment device of claim 2,

the motor is connected to the upper sides of the first anaerobic chamber and the second anaerobic chamber.

4. The small rural domestic sewage anaerobic digestion treatment device of claim 1,

the first anaerobic bin and the second anaerobic bin are integrally connected, and a sludge plate and a filter screen are arranged on one side of an outlet of each of the first anaerobic bin and the second anaerobic bin;

the mud board sets up first anaerobic storehouse with the well lower part in second anaerobic storehouse, the filter screen distributes in whole egress opening within range, in the direction that rivers go out, the filter screen is located the rear side of mud board, just the mud board with form the cavity between the filter screen.

5. The small rural domestic sewage anaerobic digestion treatment device of claim 4,

the sludge plate and the filter screen are connected in a floor frame matched with the shapes of the outflow ports of the first anaerobic bin and the second anaerobic bin;

the top surfaces of the first anaerobic bin and the second anaerobic bin are provided with plate grooves corresponding to the plate frames, and the plate frames are detachably connected in the plate grooves.

6. The small rural domestic sewage anaerobic digestion treatment device of claim 1,

anaerobic bacteria filling bottles are connected to the walls of the first anaerobic bin and the second anaerobic bin.

7. The small rural domestic sewage anaerobic digestion treatment device of claim 1,

and an L-shaped filter plate is arranged in the garbage intercepting box at a position corresponding to the outlet of the garbage intercepting box.

8. The small rural domestic sewage anaerobic digestion treatment device of claim 1,

the water inlet of the settling tank is communicated with the second anaerobic bin through a connecting pipe, a first settling area and a second settling area are respectively arranged in the settling tank from front to back along the direction of water flow in the tank body at the lower side part of the water inlet of the settling tank, and the density of the first settling area is smaller than that of the second settling area;

a partition plate is fixedly connected to the top surface of the settling tank at a position corresponding to the interface of the first settling zone and the second settling zone, and the partition plate is vertically inserted into the interface;

the water outlet of the settling tank is positioned at one side close to the second settling zone, and the position of the water outlet of the settling tank on the settling tank is as high as the position of the water inlet of the settling tank on the settling tank.

9. The small rural domestic sewage anaerobic digestion treatment device of claim 1,

the upper part of the filter tank is communicated with the settling tank through a connecting pipe, the lower part of the filter tank is connected with a water outlet, and a flowmeter is connected to the water outlet.

10. The small rural domestic sewage anaerobic digestion treatment device of claim 9,

in the filter box, along the direction of rivers, from top to bottom have connected gradually third filter, second filter and first filter, the filter density of third filter, second filter and first filter increases in proper order.

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