JP2020157237A - Trickling filter type water treatment device and method for cleaning trickling filter type water treatment device - Google Patents

Abstract

To provide a trickling filter type water treatment device capable of efficiently eliminating harmful organisms from the trickling filter type water treatment device.SOLUTION: The trickling filter type water treatment device 10 includes a water bath 11 for subjecting water to be treated to bioreaction treatment, a filter material layer 16 filled in the water bath 11, a water sprinkling device for sprinkling the water to be treated from an upper part of the water bath 11 onto the filter material layer, and a discharge port T2 for discharging treated water passing through the filter material layer, and a light-emitting device for irradiating an inner wall (vicinity of water face) of the water bath 11 with light having a wavelength evaded by harmful organisms living in the water bath is disposed.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sprinkling filter bed type water treatment device for purifying the water to be treated by sprinkling water to be treated from above on a filter medium layer housed in a water tank, and a method for cleaning the sprinkling filter bed type water treatment device.

In the sprinkler filter bed type water treatment apparatus, a filter medium layer carrying microorganisms is housed in a water tank. The filter media layer is inhabited by pests such as filter bed flies and their larvae that fly from the outside. Such pests not only hinder the operation of the sprinkler filter type water treatment device, but also have the problem of flying to the surroundings and causing discomfort to the local residents, so it is necessary to eliminate them. is there.

For this reason, pests are removed when the watering filter bed type water treatment apparatus is regularly washed. As one of the cleaning methods for cleaning the watering filter bed type water treatment device, the water tank is filled with water, the entire filter medium layer is immersed in water, and the state is maintained for a certain period of time, and the larvae of harmful organisms attached to the filter medium layer are maintained. Patent Document 1 discloses a method of suffocating an egg or the like and then discharging water.

International Publication No. 2012/161339

However, in the above-mentioned conventional method, the pests living in the water tank are evacuated upward along the wall of the water tank when the water is filled, so that the pests remain even after the cleaning operation is completed and are harmful again. It was often contaminated by living organisms.

The present invention has been made in view of the above points, and an object of the present invention is to provide a sprinkling filter type water treatment device capable of efficiently removing pests from the sprinkling filter type water treatment device. ..

In order to achieve the above object, the watering filter bed type water treatment apparatus of the present invention includes a water tank for biologically treating the water to be treated, a filter medium layer filled in the water tank, and the filter medium layer from the upper part of the water tank. In a watering filter bed type water treatment device provided with a sprinkler for sprinkling water to be treated toward the water and a discharge port for draining treated water that has passed through the filter medium layer, harmful organisms living in the water tank are repelled. A light emitting device for irradiating light having a wavelength toward the inner wall of the water tank (particularly near the water surface of the inner wall) is provided.

According to the watering filter bed type water treatment apparatus of the present invention, when water is filled, a light emitting device irradiates light having a wavelength repelled by pests toward the vicinity of the water surface on the inner wall of the water tank, thereby causing flies. Pests such as larvae can no longer evacuate upwards along the inner wall of the water tank, sinking under the surface of the water and suffocating, or being discharged together with drainage during drainage, thus killing pests more effectively. Or it can be removed.

The light emitting device may also irradiate the water surface of the aquarium with light of the wavelength.

According to the above aspect, by irradiating the inner wall of the aquarium (particularly near the water surface of the inner wall) and the water surface with light of the above wavelength, pests such as fly larvae are transmitted to the inner wall of the aquarium and evacuated to the water surface. It is possible to prevent the floating filter medium from escaping to the surface of the water and to keep it under the surface of the water to effectively suffocate.

The wavelength of the light is preferably 300 to 500 nm.

According to the above aspect, the light having a wavelength of 300 to 500 nm is the light repelled by pests such as filter bed flies. Therefore, it is possible to effectively prevent pests such as filter bed flies that easily inhabit the aquarium of the watering filter bed type water treatment device from evacuating to the surface of the water.

The light emitting device has a light emitting device capable of emitting light of the wavelength with an irradiation surface intensity of 2 × 10 ¹⁷ photons / m ² / s or more.

According to the above aspect, by emitting light of the wavelength with an irradiation surface intensity of 2 × 10 ¹⁷ photons / m ² / s or more, the evacuation of pests above the water surface can be effectively prevented.

The cleaning method of the sprinkling filter bed type water treatment apparatus of the present invention comprises a water tank for treating the water to be treated by a biological reaction, a filter medium layer filled in the water tank, and a coating from the upper part of the water tank toward the filter medium layer. In the cleaning method of a sprinkling filter bed type water treatment device provided with a sprinkler for sprinkling treated water and a discharge port for draining treated water that has passed through the filter medium layer, a wavelength that is repelled by harmful organisms living in the water tank. A light irradiation step of irradiating the inner wall of the water tank with water, a water filling step of filling the water tank with water and immersing the filter medium layer in the water, and a state in which the filter medium layer is immersed in the water. It is characterized in that the light irradiation step is executed in the submerged state maintenance step, including a step of maintaining the submerged state for 8 hours or more and a step of discharging the water from the discharge port.

Pests that live in the water tank of the sprinkler filter type water treatment device try to evacuate to the water surface along the inner wall and carrier of the water tank as the water level rises, but the wavelength that the pests repel on the inner wall of the water tank Pests cannot evacuate above the surface of the water and die of suffocation under the surface of the water. Then, when the water is discharged, it is discharged together with the discharged water, so that pests can be effectively removed.

In the cleaning method of the water sprinkling filter bed type water treatment apparatus of the present invention, the light irradiation step may be continuously performed from before the water filling step to the end of the submerged state maintenance step.

By continuing the light irradiation process from before the water filling process to the end of the submerged state maintenance process, it is possible to prevent pests from escaping above the water surface through the inner wall and carrier of the aquarium during water filling, and it is below the water surface. It can be kept forever and effectively suffocated.

In the light irradiation step, it is preferable to irradiate light of the wavelength toward the water surface of the inner wall of the aquarium and the upper portion thereof.

According to the above aspect, by irradiating the water surface of the inner wall of the aquarium and the upper part thereof with light of the wavelength, pests such as fly larvae are evacuated to the water surface through the inner wall and the carrier of the aquarium. It can be suppressed and kept below the surface of the water to effectively suffocate.

In the light irradiation step, it is preferable to irradiate light of the wavelength over the entire water surface of the water tank.

Pests that live in the aquarium are not limited to the inner wall of the aquarium, and may evacuate to the surface of the water through a filter medium that floats on the surface of the water. According to the above aspect, by irradiating the water surface with light having a wavelength repelled by pests, the filter medium floating on the water surface is also irradiated with the light, and cannot be evacuated to the water surface through the filter medium. Therefore, it is possible to kill pests more effectively.

It is a perspective view of the sprinkling filter bed water treatment apparatus by this invention. FIG. 5 is a cross-sectional view taken along the line AA of FIG. 1 of the sprinkler filter bed water treatment apparatus according to the present invention. It is explanatory drawing explaining the mode in which light is emitted by the light emitting device of FIG. It is a flow which shows the cleaning process of the sprinkler filter bed water treatment apparatus by this invention. It is explanatory drawing explaining the mode that the light is emitted by the light emitting device of the sprinkling filter bed water treatment apparatus which concerns on Example 2. FIG.

Hereinafter, the sprinkler filter type water treatment apparatus according to the present invention will be described with reference to the drawings. The sprinkler filter bed type water treatment device is a device that decomposes organic substances contained in the water to be treated by microorganisms.

As shown in FIG. 1, the water tank 11 of the sprinkler filter bed water treatment device 10 is formed in a cylindrical shape so as to be able to accommodate the water to be treated. The upper end of the water tank 11 is formed with an opening. The water tank 11 is filled (accommodated) with a filter medium layer (not shown) composed of a plurality of filter media to which microorganisms are attached. The water tank 11 is an accommodating member for treating the water to be treated by a biological reaction. The water tank 11 is not limited to a cylindrical shape but may be a prismatic shape. Further, the upper end of the water tank 11 does not necessarily have to be open, and may be formed by closing. When the upper end of the water tank 11 is closed and formed, it is preferable to provide an inspection port at the upper end of the water tank 11 so that the inside of the water tank 11 can be visually recognized.

A water sprinkling device 12 for spraying the water to be treated toward the filter medium layer is provided in the vicinity of the open end of the water tank 11. The sprinkler 12 is, for example, a rotary sprinkler that rotates along the circumferential direction of the water tank 11 by utilizing the reaction force generated by spraying the water to be treated.

The frame body 13 has a beam portion 13a having a rectangular shape when viewed from above in the direction of gravity. The beam portion 13a is provided with a through hole penetrating from one surface to the other when viewed from above in the direction of gravity. The beam portion 13a is provided so as to straddle the open end of the water tank 11. A plurality of light emitting diodes 14 are provided in a row along the shape of the beam portion 13a on the surface of the beam portion 13a facing the water tank 11.

The frame body 13 has four legs 13b extending in the direction perpendicular to the beam portion 13a from the end located at the apex of the rectangle of the beam portion 13a. The four legs 13b form a columnar shape extending along the side wall of the water tank 11. In this embodiment, the frame body 13 is provided so as to surround the water tank 11 from the outside. The frame body 13 may be provided inside the water tank 11. For example, it is preferable that the four legs 13b are provided inside the water tank 11, and a plurality of light emitting diodes 14 are provided at positions of the beam portion 13a facing the inner wall of the water tank 11 or at a position facing the bottom of the water tank 11.

The plurality of light emitting diodes 14 as the light emitting device can emit the light emitted by, for example, an LED (Light Emitting Diode) chip. The light emitting diode 14 can emit light having a wavelength repelled by pests living in the water tank 11. Examples of the pests living in the aquarium 11 include filter bed flies, chironomids, and Physella acuta.

The wavelength of light repelled by these pests is 300-500 nm. The light emitting diode 14 can emit light having a wavelength of 300 to 500 nm, which is repelled by the pests, for example. Further, the light emitting diode 14 can emit light of the wavelength with an irradiation surface intensity of 2 × 10 ¹⁷ photons / m ² / s or more.

The light emitting diode 14 may be, for example, a laser diode. In addition, the light emitting device can emit light having a wavelength of 300 to 500 nm, which is repelled by the above-mentioned pests, and emits light having the wavelength at an irradiation surface intensity of 2 × 10 ¹⁷ photons / m ² / s or more. Is possible, and is not limited to light emitting diodes. For example, the light emitting device may be a light source such as a halogen lamp or a xenon lamp. Further, the emitted light emitted from the light emitting device may be used directly, or may be used via a light guide member such as an optical fiber or a light guide rod, or a reflection member such as a mirror.

FIG. 2 shows a cross section taken along line AA of the sprinkler bed water treatment apparatus of FIG. As shown in FIG. 2, the support plate 15 is provided below the water tank 11 in the direction of gravity. The support plate 15 is formed in a disk shape and a mesh shape so as to follow the shape of the inner wall of the water tank 11.

A filter medium layer 16 for biologically treating the water to be treated is arranged on the support plate 15. A plurality of filter media 16a are arranged in the filter media layer 16. Each of the plurality of filter media 16a is formed larger than the mesh of the support plate 15. Therefore, the support plate 15 supports the plurality of filter media 26 of the filter media layer 16 and prevents the filter media 16a from falling below the support plate 15 in the direction of gravity.

The plurality of filter media 16a are formed in a cylindrical shape having both ends open, for example. Each of the plurality of filter media 16a may have, for example, a value close to 1.0, which is the specific gravity of water, for example, 0.9. Examples of the material having such a specific gravity include resins such as polyurethane and polypropylene. The specific gravity and material of the filter medium are not limited, and for example, the filter medium may be stone.

On the surface of each of the plurality of filter media 16a, microorganisms that decompose organic substances contained in the water to be treated are carried. Examples of microorganisms that decompose organic matter include biochemical oxygen demand (BOD) bacteria, ammonia-oxidizing bacteria, and nitrite-oxidizing bacteria. Examples of BOD bacteria include heterotrophic bacteria such as rotifer and Vorticella. Examples of ammonia-oxidizing bacteria include the genus Nitrosomonas, the genus Nitorosococcus, and the genus Nitrosospira. Examples of the nitrite-oxidizing bacterium include the genus Nitrobacter and the genus Nitrospira.

The pipe T1 is a water channel that guides the water to be treated to the water tank 11. The pipe T1 is arranged from the outside to the inside of the water tank 11. The pipe T1 is formed in the water tank 11 so as to extend in the direction perpendicular to the center of the bottom surface of the water tank 11 and upward in the direction of gravity. A sprinkler 12 is connected to the tip of the pipe T1. In the drawing, the pipe T1 is provided so as to penetrate the wall surface of the water tank 11. However, the pipe T1 may be arranged so as to bypass the wall surface of the water tank 11. For example, the pipe T1 may be arranged so as to straddle the opening provided at the upper end of the water tank 11.

Therefore, when the water to be treated is supplied from the pipe T1, the water to be treated is sprayed from the sprinkler device 12 toward the filter medium layer 16. At this time, the water sprinkler 12 rotates in the circumferential direction along the inner wall of the water tank 11 due to the reaction force accompanying the spraying of the water to be treated.

The drain pipe T2 is provided on the wall surface near the bottom of the water tank 11. The drain pipe T2 can drain the water to be treated from the water tank 11 after the water to be treated has been biologically treated in the water tank 11. Therefore, the drain pipe T2 is a discharge port for draining the water to be treated that has passed through the filter medium layer 16.

The drain pipe T2 can drain the water to be treated from the water tank 11 by, for example, natural flow. The valve V is provided in the drain pipe T2. By closing the valve V, it is possible to prevent the water to be treated from flowing into the drain pipe T2.

The blower BL is a blower device including a fan that rotates with the rotation of the drive shaft of the motor. The blower BL is connected to an air ejection pipe T3 which is piped to the inside of the water tank 11. The air ejection pipe T3 has a large number of air holes formed on the tip side arranged on the water tank 11 side. The air ejection pipe T3 may be arranged between the support plate 15 and the filter medium layer 16 in the water tank 11. By arranging the air ejection pipe T3 in this way, it is possible to supply air toward the filter medium layer 16 while maintaining an appropriate bubble diameter.

In the figure, the air ejection pipe T3 is provided so as to penetrate the wall surface of the water tank 11. However, the air ejection pipe T3 may be arranged so as to bypass the wall surface of the water tank 11. For example, the air ejection pipe T3 may be arranged so as to straddle the opening provided at the upper end of the water tank 11.

Therefore, when air is sent from the blower BL to the air ejection pipe T3, the air is discharged from the tip side of the air ejection pipe T3 arranged on the water tank 11 side.

The dotted arrow in the figure indicates the emitted light L emitted from the light emitting diode 14. The light emitting diode 14 is attached to the frame body 13 so as to emit the emitted light L near the water surface of the inner wall of the water tank 11. The light emitting diode 14 is attached to the frame body 13 so as to emit the emitted light L to the upper part of the water surface of the inner wall of the water tank 11, for example.

FIG. 3 shows a mode in which the emitted light L is emitted from the light emitting diode 14. The circle shown by the broken line in the figure indicates the spot diameter SD of the emitted light L. As shown in FIG. 3, the emitted light L of the plurality of light emitting diodes 14 is irradiated near the water surface of the inner wall of the water tank 11. In this figure, the emitted light L is uniformly irradiated to a position in contact with the water surface on the inner wall of the water tank 11.

In other words, the emitted light L is irradiated over the entire circumference of the upper part of the water surface of the inner wall of the water tank 11. By emitting the emitted light L in this way, it is possible to prevent the movement of pests that try to escape to the surface of the water through the inner wall of the water tank 11, and to keep the pests under the surface of the water and kill them. It becomes.

The emitted light L is not limited to the vicinity of the water surface of the inner wall of the water tank 11, and may be applied to the inner wall of the water tank 11. For example, larvae of pests may be present above the water surface of the inner wall of the aquarium 11 in the direction of gravity. By irradiating the irradiation light L on the upper side of the inner wall of the water tank 11 in the direction of gravity, it is possible to drop the larvae of pests on the water surface and exterminate them.

In the sprinkling filter bed type water treatment apparatus described above, the purification treatment of the water to be treated is performed as follows. That is, the water to be treated is sprayed from the sprinkler 12 toward the filter medium layer 16. The water to be treated passes through the voids of the filter medium layer 16 and flows down to the bottom of the water tank 11. Further, the organic matter contained in the water to be treated flowing down in the filter medium layer 16 is decomposed by the microorganisms supported on the surfaces of the plurality of filter media 16a. The decomposed water to be treated is drained from the drain pipe T2 to the outside of the water tank 11.

FIG. 4 shows a cleaning process of a sprinkler filter bed type water treatment device. As shown in FIG. 4, in cleaning the watering filter bed type water treatment device, first, light irradiation is performed by irradiating light having a wavelength repelled by harmful organisms living in the water tank 11 toward the vicinity of the water surface on the inner wall of the water tank 11. The step (step S101) is performed. In the light irradiation step, as described in the description of FIG. 3, the emitted light L is emitted from the light emitting diode 14, and the emitted light L is directed to the vicinity of the water surface of the inner wall of the water tank 11, preferably the inner wall of the water tank 11. It is advisable to irradiate the entire circumference over the part in contact with the water surface and the upper part thereof. The light irradiation step of step S101 is continuously performed until the step of step S103, which will be described later, is completed.

Next, a water filling step (step S102) is performed in which the water tank 11 is filled with water and the filter medium layer 16 is immersed in the water. Specifically, water is supplied to the water tank 11 after the valve V is closed.

After that, the state in which the filter medium layer 16 is immersed in water in the state of being irradiated with the light is maintained for 8 hours or more, and the submerged state maintenance step of suffocating the pests adhering to the filter medium layer 16 and the inner wall of the water tank (step S103). Is done. The state in which the filter medium layer 16 is immersed in water is preferably maintained for 12 hours or more. This is because the pests can be surely killed by maintaining it for 12 hours or more.

Finally, a step of discharging water from the discharge port (step S104) is performed. In step S104, the water in the water tank 11 can be drained to the outside by opening the valve V.

An aeration cleaning step may be performed in which air is ejected from the air ejection pipe T3 to stir the filter medium 16a of the filter medium layer 16 to remove sludge adhering to the filter medium 16a and suspended matter in water. This aeration cleaning step can be arbitrarily performed between the time after the water filling step in step S102 and the time after the submerged state maintenance step in step S103.

Further, the light irradiation step of step S101 may be performed at least in the submerged state maintenance step of the submerged state maintenance step of step S103. The light irradiation step of step S101 is preferably continuously performed from the start to the end of the submerged state maintenance step, and more preferably, as in the present embodiment, before the water filling step of step S102, the submersion of step S103 is performed. It is preferable to continue the process until the end of the state maintenance process. By doing so, it is possible to prevent the pests from escaping to the surface of the water along the inner wall of the water tank 11 at the time of filling with water, and it is possible to keep the pests staying under the surface of the water and effectively suffocate the pests.

Further, in this embodiment, an example in which the light emitting diode 14 is provided in the frame body 13 has been described. However, the light emitting diode 14 is not limited to the mode provided on the frame body 13, and may be provided on the inner wall of the water tank 11, for example. Further, the emitted light L may be guided into the tank of the water tank 11 by a light guide member such as an optical fiber or a light guide rod so that the light emitting member irradiates the water tank 11 with the emitted light L.

As described above, according to the watering filter bed type water treatment apparatus 10 according to the present invention, when water is filled, the light emitting diode 14 irradiates the inner wall of the water tank 11 with light having a wavelength repelled by pests. As a result, pests such as filter bed fly larvae cannot travel upward along the inner wall of the water tank 11 and sink under the water surface to die of suffocation, so that pests can be killed more effectively. It becomes. As a result, it becomes possible to efficiently eliminate pests from the watering filter bed type water treatment device.

Further, the pests living in the water tank 11 of the watering filter bed type water treatment device 10 try to evacuate to the water surface through the inner wall and the carrier of the water tank 11 as the water level rises, but on the inner wall of the water tank 11. Since the pests are irradiated with light of a wavelength that repels them, the pests cannot evacuate above the surface of the water and die by suffocation under the surface of the water. Then, when the water is discharged, it is discharged together with the discharged water, so that pests can be effectively removed.

The sprinkler filter bed type water treatment apparatus 10 according to the second embodiment will be described. The sprinkling filter type water treatment device 10 according to the second embodiment has a different irradiation range of the emitted light L emitted by the light emitting diode 14 from the sprinkling filter type water treatment device 10 according to the first embodiment. The rest of the configuration is the same as that of the sprinkler filter type water treatment apparatus 10 according to the first embodiment, and thus the description thereof will be omitted.

FIG. 5 shows a mode in which the emitted light L is emitted from the light emitting diode 14 of the water sprinkler bed type water treatment apparatus 10 according to the second embodiment. The circle shown by the broken line in the figure indicates the spot diameter SD of the emitted light L.

As shown in FIG. 5, the plurality of light emitting diodes 14 irradiate the emitted light L over the vicinity of the water surface of the inner wall of the water tank 11. Further, the plurality of light emitting diodes 14 emit the emitted light L toward the water surface of the water tank 11. In this figure, the emitted light L is uniformly irradiated to the water surface. In other words, the emitted light L is irradiated over the entire water surface of the aquarium.

When a plurality of light emitting diodes 14 are provided on the frame body 13 as in this embodiment, in the light irradiation step of step S102 described in the first embodiment, the emitted light L is set near the water surface of the inner wall of the water tank 11 and the water tank. It is preferable to emit the emitted light L toward the water surface of 11.

As described above, by irradiating the water surface of the inner wall of the aquarium and the upper part thereof with light of the above-mentioned wavelength, pests such as fly larvae are evacuated to the water surface through the inner wall and the carrier of the aquarium. Can be effectively suffocated by stopping the water and keeping it under the surface of the water. As a result, it becomes possible to efficiently eliminate pests from the watering filter bed type water treatment device.

Further, the pests living in the water tank 11 are not limited to the inner wall of the water tank 11, and may be evacuated to the water surface through a filter medium or the like floating on the water surface. In this way, by irradiating the water surface with light having a wavelength repelled by pests, the filter medium floating on the water surface is also irradiated with the above light, and it becomes impossible to evacuate to the water surface through the filter medium. It is possible to kill pests more effectively.

10 Watering filter Bed water treatment device 11 Water tank 12 Watering device 14 Light emitting diode 16 Filter material layer 16a Filter material

Claims (7)

A water tank for biological reaction treatment of water to be treated,
The filter medium layer filled in the water tank and
A sprinkler that sprinkles water to be treated from the upper part of the water tank toward the filter medium layer,
In a sprinkling filter bed type water treatment apparatus provided with a discharge port for draining the water to be treated that has passed through the filter medium layer.
A watering filter bed type water treatment device provided with a light emitting device that irradiates the inner wall of the aquarium with light having a wavelength that is repelled by pests living in the aquarium. The watering filter bed type water treatment device according to claim 1, wherein the light emitting device also irradiates the water surface of the water tank with light of the wavelength. The watering filter bed type water treatment apparatus according to claim 1 or 2, wherein the wavelength of the light is 300 to 500 nm. The sprinkling filter bed type wastewater treatment device according to any one of claims 1 to 3, wherein the light emitting device emits light of the wavelength with an irradiation surface intensity of 2 × 10 ¹⁷ photons / m ² / s or more. A water tank for biological reaction treatment of water to be treated,
The filter medium layer filled in the water tank and
A sprinkler that sprinkles water to be treated from the upper part of the water tank toward the filter medium layer,
In a method for cleaning a sprinkling filter bed type water treatment device provided with a discharge port for draining treated water that has passed through the filter medium layer.
A light irradiation step of irradiating the inner wall of the aquarium with light having a wavelength repelled by pests living in the aquarium.
A water filling step of filling the water tank with water and immersing the filter medium layer in the water.
A submerged state maintenance step of maintaining the state in which the filter medium layer is immersed in the water for 8 hours or more,
Including the step of discharging the water from the discharge port,
A method for cleaning a watering filter bed type water treatment apparatus, wherein the light irradiation step is executed in a submerged state maintenance step. The method for cleaning a watering filter bed type water treatment apparatus according to claim 5, wherein the light irradiation step is continuously performed from before the water filling step to the end of the submerged state maintenance step. The method for cleaning a sprinkling filter bed type water treatment device according to claim 5 or 6, wherein in the light irradiation step, light of the wavelength is irradiated over the entire water surface of the water tank.

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