JP2021010876A - Automatic cleaning device, biofiltration treatment apparatus, and automatic cleaning method of biofiltration treatment apparatus - Google Patents

Abstract

To provide an automatic cleaning device capable of effectively cleaning a filter medium and a treatment tank bottom part in a short time.SOLUTION: Provided is an automatic cleaning device 5 of a biofiltration treatment apparatus 1 comprising: a treatment tank 2 for storing waste water WM; and a filter layer 4 including a plurality of filter media 3 floating in the waste water. The automatic cleaning device comprises: a cylindrical closed-top gas reservoir 51 erected at a bottom part in the treatment tank 2; a cylindrical bottomed water sealing container 52 erected inside the gas reservoir 51; a drain pipe 53 of which at least one portion is disposed in the water sealing container 52; a trigger pipe 55 of which at least one portion is disposed in the water sealing container 52; and a gas supply pipe 54 which is disposed outside the treatment tank 2, and supplies gas into the gas reservoir 51. In the automatic cleaning device, a lower end of the drain pipe 53 is disposed at the bottom part of the water sealing container 52, and penetrates a top plate of the gas reservoir 51 by extending upward from the lower end, whereas an upper end is disposed outside the treatment tank 2, and a lower end of a trigger pipe 55 is connected to an aperture formed in a peripheral wall in the vicinity of the lower end of the drain pipe 53, and the upper end is open in the vicinity of the top plate.SELECTED DRAWING: Figure 1

Description

The present invention relates to an automatic cleaning device, a biological filtration processing device, and an automatic cleaning method for the biological filtration processing device.

As a sewage treatment method in a septic tank, BOD (Biochemical Oxygen) is performed by passing sewage through a filter material to separate solids in the sewage and anaerobic treatment to separate and purify organic substances with anaerobic microorganisms. Demand: Biochemical oxygen demand) is 0 to 50%, solids and oils are removed by 80 to 90% as primary treated water, and air is supplied to this primary treated water and treated to the specified water quality standard by aeration treatment. A method of discharging the secondary treated water to the water channel is known.

Regarding the quality of treated water that can be discharged, the standards for BOD, oil, solids, etc. are generally set by each country and local government in accordance with the provisions of the law. Along with these, in recent years, the removal of ammoniacal nitrogen has been strictly regulated in countries such as Southeast Asia.

As a method for efficiently removing ammoniacal nitrogen, a biological filtration treatment method is known in which the primary treated water is treated with a microorganism carried on a floating filtration. In this biological filtration treatment method, nitrifying bacteria, miscellaneous bacteria, etc. propagate in the filter material, and sludge, etc. of the primary treated water adheres to the filter material, resulting in excessive filtration resistance and reduced sewage treatment efficiency. To do. In addition, sludge and the like contained in the sewage flowing into the treatment tank settles on the bottom of the treatment tank, which also contributes to a decrease in the treatment efficiency of the sewage. Therefore, regular cleaning of the filter medium and the bottom of the treatment tank is required.

The present inventor has devised an automatic cleaning device that agitates the filter medium by lowering the water level to remove excess deposits on the surface of the filter medium and discharges sludge from the bottom of the treatment tank (Japanese Patent Laid-Open No. 2010-184210). Gazette). According to this cleaning device, excess deposits such as germs and sludge adhering to the surface of the spherical filter medium can be effectively removed, but in recent years, the shape of the filter medium has been changed in order to carry more microorganisms. It tends to be complicated and the surface area is increased, and there is a demand for a method for efficiently cleaning a filter medium having such a complicated shape. Further, in order to improve the sewage treatment efficiency, it is required to further shorten the time required for cleaning the filter medium and the bottom of the treatment tank.

JP-A-2010-184210

In view of the above circumstances, the present invention provides an automatic cleaning device and an automatic cleaning method capable of effectively cleaning the filter medium and the bottom of the treatment tank in a short time, and a biological filtration treatment device having excellent sewage treatment efficiency. The purpose is to provide.

One aspect of the present invention made to solve the above problems is an automatic cleaning device for a biological filtration treatment device including a treatment tank for storing sewage and a filtration layer having a plurality of filtration media floating in the sewage. , A ceiling-shaped gas reservoir erected at the bottom of the treatment tank, a bottomed tubular water sealer erected in the gas reservoir, and at least a part of the inside of the water sealer. A drainage pipe arranged in the water sealer, a trigger pipe arranged at least partly in the water sealer, and a gas supply machine arranged outside the treatment tank to supply gas into the gas reservoir. The lower end of the drain pipe is arranged at the bottom of the water sealer, extends upward from the lower end to penetrate the top plate of the gas reservoir, and the upper end is arranged outside the treatment tank. This is an automatic cleaning device in which the lower end of the trigger pipe is connected to an opening formed in the peripheral wall near the lower end of the drain pipe, and the upper end is opened near the top plate.

The automatic cleaning device and the automatic cleaning method of the present invention can effectively clean the filter medium and the bottom of the treatment tank in a short time. In addition, the biological filtration treatment device of the present invention is excellent in sewage treatment efficiency because effective cleaning of the filter medium and the bottom of the treatment tank is performed in a short time by the automatic cleaning method by the automatic cleaning device.

It is a conceptual sectional view of the biological filtration processing apparatus which is one Embodiment of this invention. It is a conceptual cross-sectional view which shows one state of the process of the automatic cleaning by the automatic cleaning apparatus which the biological filtration processing apparatus of FIG. 1 has. It is a conceptual cross-sectional view which shows the state of the automatic cleaning process different from FIG. It is a conceptual cross-sectional view which shows the state of the automatic cleaning process different from FIGS. 2 and 3. It is a conceptual cross-sectional view which shows the state of the automatic cleaning process different from FIGS. 2, 3 and 4. It is a schematic perspective view of the filter material used for the biological filtration processing apparatus of FIG. It is a schematic perspective view of the filter material different from FIG. It is a schematic perspective view of the filter material different from FIGS. 6 and 7. It is a conceptual perspective view of the trigger tube included in the automatic cleaning apparatus included in the biological filtration processing apparatus of FIG. It is a conceptual perspective view of the trigger tube different from FIG.

[Biofiltration device]
The biological filtration treatment device according to one aspect of the present invention is a device included in a septic tank and secondaryly treating sewage (primary treated water) that has been primarily treated by anaerobic treatment or the like by a biological filtration method. As shown in FIG. 1, the biological filtration device 1 comprises a processing tank 2 for storing the sewage W _M, and the filtration layer 4 having a plurality of filtering material 3 which floated in the sewage W _M, and an automatic cleaning device 5 Mainly has.

<Processing tank>
The treatment tank 2 has a filtration layer 4 and an automatic cleaning device 5 described later inside. Treatment vessel 2, together with storing the sewage W _{M (primary} treatment water) flowing, and the sewage W _M filtration to treated water W _{C (secondary} treated water) is discharged the treated water W _C. Specifically, the processing tank 2 includes a sewage inlet 21 the sewage W _M flows, the treated water outlet 22 for discharging the treated water W _C above the filtration layer 4 below the filtration layer 4. Sewage W _M flowing from the sewage inlet 21 is filtered treated by filtration layer 4 is discharged from treated water outlet 22 as treated water W _C.

<Filtration layer>
Filtration layer 4, a sewage W _M filtration to the treated water W _C. In other words, sewage W _M flowing from the sewage inlet 21 is purified in the treated water W _C by passing through the filtering layer 4 before being transmitted from the treated water outlet 22. Specifically, the filtration layer 4 is formed of a plurality of filtering material 3 which floated in the sewage W _M, filtration material 3 and sewage W _M purification to the treated water W _C by microorganisms bearing.

The filtration layer 4 preferably has an upper surface screen 41 on the upper surface of the layer and a lower surface screen 42 on the lower surface of the layer in order to prevent dispersion of the filter medium 3. Top screen 41 and the lower surface screen 42, sewage W _M and process water W _C can pass a, having a plurality of holes can not pass through the filtering material 3. The upper surface screen 41 and the lower surface screen 42 are fixed at predetermined positions in the processing tank 2. By doing so, it is possible to prevent the filter medium 3 from being dispersed beyond a predetermined region of the treatment tank 2.

(Filter material)
A plurality of filtering material 3 forms a filtration layer 4 emerged in sewage W _M. Filtering material 3 carries a microorganism for purifying sewage W _M. The shape of the filter material 3 is not particularly limited, and may be spherical, columnar, or the like, but is preferably tubular. The tubular cross-sectional shape is not particularly limited and may be rectangular, polygonal, elliptical or the like, but is preferably circular. By the shape of the filter member 3 and cylindrical, it is possible the gap formed between the filtering material 3 between which the filtration media 3 inside and adjacent sewage W _M passes, a relatively small filtration resistance be able to.

The upper limit of the outer diameter of the cylindrical filter medium 3 is preferably 20 mm, more preferably 18 mm, and even more preferably 15 mm. The lower limit of the outer diameter of the cylindrical filter medium 3 is not particularly limited, but may be, for example, 5 mm. If the outer diameter of the filter medium 3 exceeds the above upper limit, the number of the filter media 3 forming the filter layer 4 is reduced, and efficient filtration treatment may not be possible. If the outer diameter of the filter material 3 does not meet the above lower limit, it may be difficult to handle the filter material 3. The "outer diameter of the filter medium 3" is a cross section of the cylindrical filter medium 3 and is the diameter of the outer peripheral surface of the circle.

The upper limit of the length of the cylindrical filter medium 3 is preferably 18 mm, more preferably 15 mm, still more preferably 10 mm. The lower limit of the length of the cylindrical filter medium 3 is not particularly limited, but may be, for example, 5 mm. If the length of the filter medium 3 exceeds the above upper limit, the number of the filter media 3 forming the filter layer 4 is reduced, and efficient filtration treatment may not be possible. If the length of the filter material 3 does not reach the above lower limit, it may be difficult to handle the filter material 3. The "length of the filter medium 3" is the length of the outer diameter in the central axis direction.

It is preferable that at least one wall plate 31 is arranged on the inner peripheral surface of the cylindrical filter medium 3. By doing so, the surface area of the filter medium 3 can be increased, and more microorganisms can be supported. The shape of the wall plate 31 is not particularly limited, but it is preferable that the wall plate 31 is arranged including the radial central axis of the filter medium 3. Specifically, as shown in FIG. 6, the radial ends of the wall plate 31 are all connected to the inner peripheral surface of the filter medium 3, and the two connected ends are at the central axis. It is preferably located symmetrically. By arranging the wall plate 31 in this way, the surface area of the wall plate 31 can be increased. As other shapes of the wall plate 31, as shown in FIG. 7, two inner peripheral surfaces to which both ends are connected are not located symmetrically with respect to the center in the radial direction, and one end thereof is as shown in FIG. It can be a wall plate 33 or the like that is connected to the inner peripheral surface of the filter medium 3 and the other end is not connected to the inner peripheral surface. The lengths of the wall plates 31, 32, 33 may be the same as the length of the filter medium 3, or may be equal to or less than the length of the filter medium 3.

Since the filter material 3 becomes heavy due to the adhesion of sludge and the like, if the specific gravity of the filter material 3 is 0.98 or more, it may float and the filter layer 4 cannot be formed. The upper limit of the specific gravity of the filter material 3 is preferably 0.95, more preferably 0.92, and even more preferably 0.90. The lower limit of the specific gravity of the filter material 3 is preferably 0.3, more preferably 0.5, and even more preferably 0.7. If the specific gravity of the filter material 3 exceeds the above upper limit, it becomes difficult for the filter material 3 to float in water, and it may become difficult to form the filter layer 4. If the specific gravity of the filter material 3 does not reach the above lower limit, the levitation force of the filter material 3 becomes excessively large, and the formation of the filter layer 4 may become difficult.

The material of the filter material 3 is not particularly limited, but it is preferable to use a resin or the like which can easily carry microorganisms and can relatively easily adjust the specific gravity.

<Automatic cleaning device>
The automatic cleaning device 5 includes a ceiling-shaped gas reservoir 51 erected at the bottom of the treatment tank 2, a bottomed tubular water sealer 52 erected in the gas reservoir 51, and at least a part thereof. On the outside of the treatment tank 2, the drain pipe 53 is arranged so that the gas is located inside the water sealer 52, and the trigger pipe 55 is arranged so that at least a part of the gas is located inside the water sealer 52. It mainly has a gas feeder (not shown) to be arranged. The automatic cleaning device 5 is an aspect of the present invention. In FIG. 1, the automatic cleaning device 5 is arranged substantially in the center of the processing tank 2.

(Gas reservoir)
The gas reservoir 51 is erected at the bottom of the treatment tank 2. The gas reservoir 51 has a tubular shape having a circular cross section, a polygonal shape, or the like. The gas reservoir 51 has a topped cylinder shape. Specifically, the gas reservoir 51 has a top plate whose bottom is open and whose upper end is closed. The gas reservoir 51 is arranged so that the bottom portion is close to the bottom portion of the treatment tank 2. On the bottom side of the gas reservoir 51, a gas supply pipe 54 for communicating the gas reservoir 51 and the gas supply machine is arranged. The gas reservoir 51 stores the gas A supplied from the gas supply pipe 54.

The top plate of the gas reservoir 51 may be arranged horizontally, but it is preferable that the top plate of the gas reservoir 51 is arranged at an inclination such as having an elevation angle toward the center of the cross section of the gas reservoir 51. By doing so, the storage of the gas A is started from the uppermost portion of the top plate, so that the gas A can be stably stored.

(Water sealer)
The water sealer 52 is erected in the gas reservoir 51. The water sealer 52 has a bottomed tubular shape. Specifically, the bottom of the water sealer 52 is closed and the upper end is open. The water sealer 52 preferably has a cylindrical shape having a circular cross section, a polygonal shape, or the like, and the lower surface of the bottom portion (outer surface of the bottom portion) is in contact with the upper surface of the bottom portion (inner surface of the bottom portion) of the treatment tank 2.

(Drainage pipe)
The drain pipe 53 is arranged so that at least a part thereof is located in the water sealer 52. The lower end of the drain pipe 53 is arranged at the bottom of the water sealer 52, extends upward from the lower end to penetrate the top plate of the gas reservoir 51, and the upper end is arranged outside the treatment tank 2. That is, the drain pipe 53 communicates the vicinity of the bottom of the water sealer 52 with the outside of the treatment tank 2. The drainage pipe 53 has a circular or polygonal cross section (cylindrical shape). Drain pipe 53 discharges a part of the sewage W _M that is stored in the processing tank 2 to the outside of the treatment tank 2. An opening 56 is formed in the peripheral wall near the lower end of the drain pipe 53.

It is preferable that the drain pipe 53 is arranged so that at least a part thereof is higher than the water surface of the treatment layer 2. Specifically, it is preferable that at least a part of the drain pipe 53 is arranged at a position higher than the treated water discharge port 22 of the treatment layer 2. If the entire drainage tube 53 is lower than the processing water outlet 22 position, from the drain pipe 53 the sewage W _M flows out reduces the water level in the treatment tank 2, is a possibility that the discharge of treated water W _C becomes difficult is there.

(Trigger tube)
The trigger pipe 55 is arranged so that at least a part thereof is located in the water sealer 52. The lower end of the trigger pipe 55 is connected to an opening 56 formed in the peripheral wall near the lower end of the drain pipe 53, and the upper end is opened near the top plate of the gas reservoir 51. That is, the trigger pipe 55 communicates with the inside near the lower end of the drain pipe 53 and the upper region in the gas reservoir 51.

The shape of the trigger pipe 55 is not particularly limited as long as it communicates between the inside near the lower end of the drain pipe 53 and the upper region in the gas reservoir 51. For example, as shown in FIG. A tubular member having a circular or polygonal cross section may be used, or as shown in FIG. 10, a plate-shaped member, an opening 56 of the drain pipe 53, a side plate covering a part of the outer surface of the peripheral wall, and an opening 56. It may be formed by a bottom plate which is located on the lower side and closes a gap between the side plate and the peripheral wall of the drain pipe 53.

[Automatic cleaning method]
The automatic cleaning method of the biofiltration treatment apparatus according to one aspect of the present invention includes at least the discharge pipe 53 in the step of storing the gas A supplied from the gas supply machine in the gas reservoir 51 and the pressure of the stored gas A. a step of sewage W _M of the inner and water sealing vessel 52 flows out from the upper end of the discharge pipe 53, the gas a reaches the opening 56 formed in the peripheral wall near the lower end of the drain pipe 53, at least drainpipe sewage W _M and the gas a remaining 53 and a step of ejecting from the upper end of the discharge pipe 53, the ejection process, the sewage W _M and sludge M of the processing tank 2, the gas reservoir 51, a water seal A step of introducing into the vessel 52 and a discharge pipe 53, a step of rapidly lowering the water level of the treatment tank 2 by the above introduction, and a step of deploying and stirring a plurality of filtering materials 3 in water due to the water level drop due to the sudden drop. The step of cleaning the excess deposits adhering to the filter material 3 by the above-mentioned development and stirring is included.

This automatic cleaning method is preferably performed on a regular basis. The interval of automatic cleaning is not particularly limited, and may be 24 hours, 2 days, once a week, or the like. In this automatic cleaning method, all of the above steps are regarded as one cycle, and one cycle may be performed by one automatic cleaning, or two or more cycles may be performed.

The automatic cleaning process may be carried out while continuing the supply of sewage W _M into the processing vessel 2 is preferably performed by stopping the supply of sewage W _M into the processing tank 2. That is, the automatic cleaning method may be performed while performing the filtration treatment, but it is preferable to stop the filtration process and perform the automatic cleaning method. The supply of sewage W _M into the processing tank 2 by making stopped, it is possible to increase the water level drop in the filtration material agitation process described below. The following describes the automatic cleaning process performed by stopping the supply of sewage W _M into the processing tank 2.

<Gas storage process>
When the automatic cleaning is not, i.e. when the filtering process is performed, the processing tank 2 sewage W _M is supplied from the sewage inlet 21. This the supplied sewage W _M is discharged from the treated water outlet 22 is filtration filtration layer 4 as treated water W _C. At an arbitrarily determined automatic cleaning time, the gas A is supplied into the gas reservoir 51 from the gas supply machine arranged outside the treatment tank 2 through the gas supply pipe 54. This supply of gas A is, to the supply of sewage W _M into the processing vessel 2 may be started from the stop, after a lapse of a predetermined time from the start of the supply of gas A, to the treatment tank 2 of the supply of sewage W _M may be stopped.

<Sewage outflow process>
As shown in FIG. 2, the volume of the gas A increases from the top plate of the gas reservoir 51 toward the bottom of the treatment tank 2 and lowers the water level in the gas reservoir 51. The drawdown in the gas reservoir 51, and sewage W _M, which had been reserved in the water seal 52 and within the discharge pipe 53, and the sludge M to be precipitated in water seal 52 bottom is arranged outside the processing tank 2 It flows out from the upper end of the discharge pipe 53.

<Sewage ejection process>
As shown in FIG. 3, the gas A, while receiving a pressure of sewage W _M and process water W _C in the processing tank 2, further increasing its volume. When the gas A reaches the opening 56 formed near the lower end of the drain pipe 53, all of the gas A in the gas reservoir 51 momentarily flows into the drain pipe 53 and is discharged from the upper end of the drain pipe 53. To. Gas A, at the same time is released from the drain pipe 53, jetting sewage W _M remaining in the drain pipe 53 from the upper end of the drain pipe 53. At least a part of the sewage W _M and sludge M remaining in the bottom of the water seal 52 is sucked and ejected from the upper end of the drain pipe 53.

As shown in FIG. 4, the ejection process, the sewage W _M and sludge M of the processing tank 2, a step of introducing the inner gas reservoir 51 or the like, to sharply lower the water level in the treatment tank 2 by the introduction, this It includes a step of developing and stirring the filter material 3 in water by the water level drop, and a step of cleaning excess deposits of the filter material 3 by the above-mentioned development and stirring.

(Sewage introduction process)
The gas reservoir 51 and the discharge pipe 53 by the release of gas A is in the state of substantial vacuum, sewage W _M outside the gas reservoir 51 which is stored in the processing tank 2, inside the gas reservoir 51, water It is introduced as a torrent in the sealer 52 and the discharge pipe 53. With torrent of sewage W _M, at least a portion of the sludge M being precipitated in the processing tank 2 bottom, moves to the water seal 52 bottom. The sludge M moved to the bottom of the water sealer 52 is discharged from the discharge pipe 53 in the next automatic cleaning.

(Filter material stirring process)
Sewage W _M of volume and substantially the same volume of emitted gas A at the same time as that introduced a the torrent, the water level in the treatment tank 2 decreases sharply. This impact by sudden decrease water level drop, a plurality of filtering material 3 forming the filter layer 4 is deployed and stirred in sewage W _M and process water W _C.

(Sludge cleaning process)
The filter medium 3 that develops and stirs in water due to the impact of the water level drop is cleaned by peeling off excess deposits on the surface of the filter medium 3 by the impact, contact between the filter media 3 and the like. The exfoliated excess deposits settle and become a part of the sludge M that settles at the bottom of the treatment tank 2. Note that the "excess deposit" means sludge contained in the sewage W _M, nitrifying bacteria was propagated in the filtering material 3 surface, the bacteria and the like.

The sewage ejection step, the instantaneous release of gas A that triggered that gas A to be stored reaches the opening 56 of the drainage tube 53, ejection of sewage W _M in the discharge pipe 53, sewage W _M The torrent to the gas reservoir 51 and the like, the sudden drop in the water level of the treatment tank 2, the deployment of the filter medium 3 and the stirring can be performed in a short time. In particular, in order to effectively wash the filter material 3, it is preferable that the filter material 3 is rapidly developed and stirred. The upper limit of the time from the start to the end of the development and stirring of the filter material 3, that is, from the start of the development and stirring of the filter material 3 to the minimum number (density) of the filter material 3 per unit volume. 3 seconds is preferable, and 2.5 seconds is more preferable. If the above time exceeds the above upper limit, effective cleaning of the filter medium having a complicated shape may not be possible.

As shown in FIG. 5, the filter medium 3 developed and stirred in water floats in the treatment tank 2 and forms the filter layer 4 again. The treatment tank 2, the supply of sewage W _M is resumed.

[advantage]
The automatic cleaning device 5 is a simple one having a gas reservoir 51, a water sealer 52, a drain pipe 53 and a trigger pipe 55 arranged in the processing tank 2 and a gas supply machine arranged outside the processing tank 2. Because of this configuration, it can be produced at low cost and can be relatively easily arranged in the processing tank 2.

Automatic cleaning method by the automatic cleaning device 5, it is possible to end the discharge and cleaning of the excess deposits of filtering material 3 of the sludge M to be precipitated in the processing tank 2 in a short time, the efficiency of filtration of sewage W _M It is possible to suppress the decrease. Since the automatic cleaning can be performed in a short time, it is possible to relatively suppress a decrease in the efficiency of the filtration treatment even when the automatic cleaning is performed continuously for two or more cycles in order to further enhance the cleaning effect. Further, since the excess deposits are washed by the impact due to the sudden drop in the water level and the deployment and stirring of the filter material 3, the filter material 3 can be effectively washed, and the filter material 3 has a complicated shape. Even if it has, the cleaning effect is relatively excellent. In the automatic cleaning method, the automatic cleaning device 5 having the above-mentioned simple configuration enables rapid deployment and stirring of the filter material 3 within 2.5 seconds to 3 seconds, and even a filter material having a complicated shape can be used. It can exert effective cleaning power.

Since the biological filtration processing device 1 includes a low-cost automatic cleaning device 5 capable of performing effective automatic cleaning in a short time, the efficiency of the filtration processing is excellent and the production can be performed at low cost.

[Other Embodiments]
It should be considered that the disclosed embodiments are exemplary in all respects and not restrictive. The scope of the present invention is not limited to the configuration of the above embodiment, but is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. To.

In the above embodiment, the example in which the automatic cleaning device is arranged substantially in the center of the bottom of the processing tank has been described, but the present invention is not limited to this, and the lower part of the processing tank is widened and automatic cleaning is performed in this widened area. The device may be arranged.

As described above, the automatic cleaning method for the automatic cleaning device and the biological filtration processing device of the present invention can perform efficient automatic cleaning in a short time, and thus can be suitably used for the biological filtration processing device. The biological filtration treatment device provided with the automatic cleaning device of the present invention can be suitably used for a septic tank because of its excellent filtration treatment efficiency.

1 Biological filtration treatment device 2 Treatment tank 3 Filter material 4 Filter layer 5 Automatic cleaning device 21 Sewage inlet 22 Treated water discharge port 31, 32, 33 Board wall 41 Top screen 42 Bottom screen 51 Gas reservoir 52 Water sealer 53 Drain pipe 54 gas supply pipe 55 triggers pipe 56 opening M sludge W _M sewage W _C treated water

Claims (6)

An automatic cleaning device for a biological filtration treatment device including a treatment tank for storing sewage and a filtration layer having a plurality of filter media floating in the sewage.
The topped cylinder-shaped gas reservoir installed at the bottom of the processing tank and
A bottomed tubular water sealer installed in the gas reservoir and
The drainage pipe, which is at least partly arranged in the water sealer,
A trigger tube, at least part of which is placed inside the water sealer,
It is provided with a gas supply machine that is arranged outside the treatment tank and supplies gas to the gas reservoir.
The lower end of the drainage pipe is arranged at the bottom of the water sealer, extends upward from the lower end to penetrate the top plate of the gas reservoir, and the upper end is arranged outside the treatment tank.
An automatic cleaning device in which the lower end of the trigger pipe is connected to an opening formed in the peripheral wall near the lower end of the drain pipe, and the upper end is opened near the top plate. It has a treatment tank for storing sewage, a filtration layer having a plurality of filter media floating in the sewage, and an automatic cleaning device.
The above automatic cleaning device
The topped cylinder-shaped gas reservoir installed at the bottom of the processing tank and
A bottomed tubular water sealer installed in the gas reservoir and
The drainage pipe, which is at least partly arranged in the water sealer,
A trigger tube, at least part of which is placed inside the water sealer,
It is provided with a gas supply machine that is arranged outside the treatment tank and supplies gas to the gas reservoir.
The lower end of the drainage pipe is arranged at the bottom of the water sealer, extends upward from the lower end to penetrate the top plate of the gas reservoir, and the upper end is arranged outside the treatment tank.
A biological filtration treatment device in which the lower end of the trigger pipe is connected to an opening formed in the peripheral wall near the lower end of the drainage pipe, and the upper end is open in the vicinity of the top plate. The biological filtration processing apparatus according to claim 2, wherein the filter medium is cylindrical, has an outer diameter of 18 mm or less, a length of 18 mm or less, and a specific gravity of 0.98 or less. The biological filtration processing apparatus according to claim 3, wherein at least one wall plate is arranged on the inner peripheral surface of the filter material. The biological filtration processing apparatus according to claim 4, wherein the wall plate is arranged including a radial central axis of the filter medium. A method of automatically cleaning a biological filtration treatment device including a treatment tank for storing sewage, a filtration layer having a plurality of filter media floating in the sewage, and an automatic cleaning device by the automatic cleaning device.
The above automatic cleaning device
The topped cylinder-shaped gas reservoir installed at the bottom of the processing tank and
A bottomed tubular water sealer installed in the gas reservoir and
The drainage pipe, which is at least partly arranged in the water sealer,
A trigger tube, at least part of which is placed inside the water sealer,
It is provided with a gas supply machine that is arranged outside the treatment tank and supplies gas to the gas reservoir.
The lower end of the drainage pipe is arranged at the bottom of the water sealer, extends upward from the lower end to penetrate the top plate of the gas reservoir, and the upper end is arranged outside the treatment tank.
The lower end of the trigger pipe is connected to an opening formed in the peripheral wall near the lower end of the drainage pipe, and the upper end opens near the top plate.
The process of storing the gas supplied from the gas supply machine in the gas reservoir and
At least the sewage in the discharge pipe and the water sealer flows out from the upper end of the discharge pipe at the pressure of the stored gas.
The gas reaches the opening formed in the peripheral wall near the lower end of the drainage pipe, and at least the sewage remaining in the drainage pipe and the gas are ejected from the upper end of the drainage pipe.
The above ejection process
The step of introducing the sewage and sludge from the treatment tank into the gas reservoir, the water sealer, and the discharge pipe.
A step of rapidly lowering the water level of the treatment tank by the above introduction, and developing and stirring the plurality of filter media in water due to the water level drop due to the sudden drop.
An automatic cleaning method for a biological filtration treatment device, which comprises a step of cleaning excess deposits adhering to the filter medium by the above development and stirring.

Images