JP7232443B2 - Trickling filter type water treatment equipment and method for cleaning the trickling filter type water treatment equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a trickling filter-type water treatment apparatus that purifies water to be treated by sprinkling water to be treated from above onto a filter medium layer housed in a water tank, and a cleaning method for the trickling-filter-type water treatment apparatus.

In a trickling filter type water treatment apparatus, a filter medium layer carrying microorganisms is housed in a water tank. Pests such as filter bed flies flying from the outside and their larvae live in the filter medium layer. Such pests not only hinder the operation of trickling filter-type water treatment equipment, but also cause problems such as flying around and causing discomfort to local residents, so it is necessary to eliminate them. be.

Therefore, harmful organisms are removed during regular cleaning of the trickling filter type water treatment apparatus. As one of the cleaning methods for cleaning the percolating filter bed type water treatment equipment, fill the water tank with water, immerse the entire filter medium layer in water, and maintain the state for a certain period of time to remove the larvae of pests adhering to the filter medium layer. Patent document 1 discloses a method of suffocating eggs and the like and then discharging water.

WO2012/161339

However, in the above-mentioned conventional method, the pests living in the water tank retreat upward along the wall of the water tank when the water is filled. They were often contaminated with organisms.

The present invention has been made in view of the above points, and an object thereof is to provide a trickling filter type water treatment apparatus capable of efficiently removing harmful organisms from the trickling filter type water treatment apparatus. .

In order to achieve the above object, the trickling filter bed type water treatment apparatus of the present invention comprises a water tank for biological reaction treatment of water to be treated, a filter medium layer filled in the water tank, and a filter medium layer from above the water tank. a sprinkler filter bed type water treatment apparatus comprising a sprinkler for sprinkling water to be treated toward and an outlet for draining the treated water that has passed through the filter media layer, wherein pests living in the water tank are repelled A light-emitting device is provided for irradiating light of a wavelength toward the inner wall of the water tank (especially near the water surface of the inner wall).

According to the trickling filter-type water treatment apparatus of the present invention, when water is filled, the light emitting device irradiates light of a wavelength that pests repel toward the vicinity of the water surface of the inner wall of the water tank, thereby eliminating flies. Pests such as larvae are no longer able to evacuate upwards along the inner wall of the tank, sink below the surface of the water and suffocate to death, or are discharged together with the drainage when draining, so pests are killed more effectively. or can be removed.

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

According to the above aspect, by irradiating the inner wall of the water tank (especially near the water surface of the inner wall) and the water surface with the light of the wavelength, pests such as fly larvae travel along the inner wall of the water tank and evacuate above the water surface. It can prevent them from escaping to the surface of the water through floating filter media, causing them to remain below the surface and effectively suffocate to death.

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

According to the above aspect, light with a wavelength of 300 to 500 nm is light that pests such as filter bed flies repel. Therefore, it is possible to effectively prevent pests such as filter bed flies, which tend to live in the water tank of the trickling filter type water treatment apparatus, from escaping above the water surface.

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 the light of the wavelength with an irradiation surface intensity of 2×10 ¹⁷ photons/m ² /s or more, it is possible to effectively prevent pests from escaping above the water surface.

The method for cleaning a trickling filter bed type water treatment apparatus of the present invention comprises a water tank for subjecting water to be treated to biological reaction treatment, a filter medium layer filled in the water tank, and a filter material layer directed from the top of the water tank toward the filter medium layer. A method for cleaning a water sprinkler bed type water treatment apparatus comprising a water sprinkler for spraying treated water and an outlet for discharging treated water that has passed through the filter media layer, wherein the wavelength is repelled by pests living in the water tank. a light irradiating step of irradiating the inner wall of the water tank with light, 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. A submerged state maintaining step of maintaining for eight hours or more, and a step of discharging the water from the outlet, wherein the light irradiation step is performed in the submerged state maintaining step.

Pests living in the water tank of a trickling filter-type water treatment device try to escape to the surface of the water along the inner walls and carriers of the water tank as the water level rises. of light, pests cannot escape above the surface of the water and suffocate to death below the surface of the water. And, when the water is discharged, it is flushed out together with the discharged water, so the pests can be effectively removed.

In the method for cleaning a trickling filter-type water treatment apparatus of the present invention, the light irradiation step is preferably performed continuously from before the water filling step until the end of the submerged state maintaining step.

By continuing the light irradiation process from before the water filling process until the end of the submerged state maintenance process, it is possible to prevent harmful organisms from escaping to the surface of the water along the inner wall of the tank and the carrier during water filling. Can be made to stay the whole time and effectively suffocate.

In the light irradiation step, it is preferable to irradiate the water surface of the inner wall of the water tank and the upper part thereof with the light of the wavelength.

According to the above aspect, by irradiating the water surface and the upper part of the inner wall of the tank with the light of the wavelength, it is possible to prevent harmful organisms such as fly larvae from escaping on the water surface along the inner wall and the carrier of the tank. It can be suppressed and effectively suffocated to death by keeping it under water.

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

Pests living in a water tank are not limited to the inner wall of the water tank, but may escape to the surface of the water by traveling along the surface of the water such as filter media. According to the above aspect, by irradiating the water surface with light having a wavelength that pests repel, the filter medium floating on the water surface is also irradiated with the light, and it becomes impossible to escape to the water surface through the filter medium. Therefore, it becomes possible to kill pests more effectively.

1 is a perspective view of a trickling filter bed water treatment apparatus according to the present invention; FIG. FIG. 2 is a cross-sectional view of the trickling filter bed water treatment apparatus according to the present invention, taken along line AA of FIG. 1; FIG. 2 is an explanatory diagram illustrating a mode in which light is emitted by the light emitting device of FIG. 1; It is a flow which shows the washing process of the trickling filter bed water treatment apparatus by this invention. FIG. 10 is an explanatory diagram illustrating a mode in which light is emitted by the light emitting device of the trickling filter water treatment apparatus according to Example 2;

Hereinafter, a trickling filter type water treatment apparatus according to the present invention will be described with reference to the drawings. A trickling filter type water treatment device is a device that decomposes organic matter contained in water to be treated with microorganisms.

As shown in FIG. 1, the water tank 11 of the trickling filter water treatment apparatus 10 is formed in a cylindrical shape so that the water to be treated can be accommodated therein. The upper end of the water tank 11 is formed open. The water tank 11 is filled (accommodated) with a filter medium layer (not shown) composed of a plurality of filter mediums to which microorganisms are attached. The water tank 11 is a storage member for biological reaction treatment of the water to be treated. Incidentally, the water tank 11 is not limited to a cylindrical shape, and may be prismatic. Moreover, the upper end of the water tank 11 does not necessarily have to be open, and may be closed. When the upper end of the water tank 11 is closed and formed, an inspection opening through which the inside of the water tank 11 can be visually recognized is preferably provided at the upper end of the water tank 11 .

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

The frame 13 has a rectangular beam 13a 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 surface when viewed from above in the direction of gravity. The beam portion 13 a is provided so as to straddle the opening end of the water tank 11 . A plurality of light-emitting diodes 14 are arranged in a row along the shape of the beam portion 13a on the surface of the beam portion 13a facing the water tank 11. As shown in FIG.

The frame 13 has four legs 13b extending in a direction perpendicular to the beams 13a from the ends located at the rectangular vertices of the beams 13a. The four legs 13b are columnar and extend along the side walls of the water tank 11. As shown in FIG. In this embodiment, the frame 13 is provided so as to surround the water tank 11 from the outside. The frame 13 may be provided inside the water tank 11 . For example, four legs 13b may be provided inside the water tank 11, and a plurality of light emitting diodes 14 may be provided at positions of the beams 13a facing the inner wall of the water tank 11 or facing the bottom of the water tank 11.

A plurality of light emitting diodes 14 as light emitting devices can emit light emitted by LED (Light Emitting Diode) chips, for example. The light-emitting diode 14 can emit light having a wavelength that is repelled by pests living in the water tank 11 . Pests living in the water tank 11 include, for example, filter bed flies, midges, and mussels.

The wavelength of light that these pests repel is 300-500 nm. The light-emitting diode 14 can emit, for example, light with a wavelength of 300-500 nm, which is repelled by the pests. Moreover, 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.

Incidentally, the light emitting diode 14 may be, for example, a laser diode. In addition, the light emitting device is capable of emitting light with a wavelength of 300 to 500 nm, which is repelled by the pests, and emits the light with 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. In addition, the emitted light emitted from the light emitting device may be used directly, or may be used through a light guide member such as an optical fiber or a light guide rod, or a reflecting member such as a mirror.

FIG. 2 shows a cross section of the trickling filter bed water treatment apparatus of FIG. 1 taken along the line AA. As shown in FIG. 2, the support plate 15 is provided below the water tank 11 in the gravitational direction. The support plate 15 is formed in a disk shape and mesh shape so as to follow the shape of the inner wall of the water tank 11 .

A filter medium layer 16 for biological treatment of the water to be treated is arranged on the support plate 15 . A plurality of filter media 16 a are arranged in the filter media layer 16 . Each of the plurality of filter media 16 a 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 gravity direction.

The plurality of filter media 16a are formed, for example, in a cylindrical shape with both ends opened. 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, such as 0.9. Materials having such a specific gravity include resins such as polyurethane and polypropylene. The specific gravity and material of the filter medium are not limited to those described above, and the filter medium may be, for example, stone.

Microorganisms that decompose organic matter contained in the water to be treated are carried on the surface of each of the plurality of filter media 16a. Examples of microorganisms that decompose organic matter include BOD (Biochemical Oxygen Demand) bacteria, ammonia-oxidizing bacteria, nitrite-oxidizing bacteria, and the like. BOD bacteria include, for example, heterotrophic bacteria such as rotifers and vortices. Examples of ammonia-oxidizing bacteria include the genus Nitrosomonas, the genus Nitrosococcus, and the genus Nitrosospira. Examples of nitrite-oxidizing bacteria include the genus Nitrobacter and the genus Nitrospira.

The pipe T<b>1 is a 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 vertically with respect to the center of the bottom surface of the water tank 11 and upward in the direction of gravity. A water sprinkler 12 is connected to the tip of the pipe T1. In addition, in the drawing, the pipe T1 is provided so as to penetrate the wall surface of the water tank 11 . However, the pipe T<b>1 may be arranged so as to bypass the wall surface of the water tank 11 . For example, the pipe T<b>1 may be arranged so as to straddle an opening provided at the upper end of the water tank 11 .

Therefore, when the water to be treated is supplied from the pipe T<b>1 , the water to be treated is sprayed toward the filter media layer 16 from the sprinkler device 12 . At this time, the sprinkler device 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 is biologically treated in the water tank 11 . Therefore, the drain pipe T2 is an outlet for draining the water to be treated that has passed through the filter medium layer 16. As shown in FIG.

The drain pipe T2 can drain the water to be treated from the water tank 11 by gravity flow, for example. In addition, the valve V is provided in the drain pipe T2. By closing the valve V, the water to be treated can be prevented from flowing into the drain pipe T2.

The blower BL is an air blowing device provided with 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 that extends into the water tank 11 . The air ejection pipe T3 has a large number of air holes formed on the tip end thereof which is arranged on the water tank 11 side. The air ejection pipe T3 is preferably arranged between the support plate 15 and the filter layer 16 in the water tank 11 . By arranging the air ejection pipe T3 in this manner, it is possible to supply air toward the filter medium layer 16 while maintaining an appropriate bubble diameter.

In addition, in the drawing, the air ejection pipe T3 is provided so as to penetrate the wall surface of the water tank 11. As shown in FIG. 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 an opening provided at the upper end of the water tank 11 .

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

A dotted arrow in the drawing indicates the emitted light L emitted from the light emitting diode 14 . The light-emitting diode 14 is attached to the frame 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 13 so as to emit the emitted light L above 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. As shown in FIG. A circle indicated by a dashed line in the drawing indicates the spot diameter SD of the emitted light L. As shown in FIG. As shown in FIG. 3, the emitted light L of the plurality of light emitting diodes 14 is irradiated on the inner wall of the water tank 11 near the water surface. In this figure, the emitted light L is uniformly applied to the inner wall of the water tank 11 at a position in contact with the water surface.

In other words, the emitted light L is irradiated over the entire circumference of the inner wall of the water tank 11 above the water surface. In this way, by emitting the emitted light L, it is possible to prevent the movement of pests that try to escape above the water surface along the inner wall of the water tank 11, and to make the pests stay under the water surface and kill them. becomes.

In addition, the emitted light L is not limited to the vicinity of the water surface of the inner wall of the water tank 11, and it is preferable that the inner wall of the water tank 11 is irradiated. For example, pest larvae may exist above the water surface of the inner wall of the water tank 11 in the direction of gravity. By irradiating the irradiation light L above the water surface of the inner wall of the water tank 11 in the gravitational direction, it becomes possible to exterminate the larvae of pests by dropping them onto the water surface.

In the trickling filter type water treatment apparatus described above, the water to be treated is purified as follows. That is, the water to be treated is sprayed from the sprinkler device 12 toward the filter media layer 16 . The water to be treated passes through the gaps in the filter media layer 16 and flows down to the bottom of the water tank 11 . Also, organic matter contained in the water to be treated flowing down the filter media layer 16 is decomposed by microorganisms supported on the surfaces of the plurality of filter media 16a. The decomposed water to be treated is discharged to the outside of the water tank 11 through the drain pipe T2.

FIG. 4 shows the washing process of the trickling filter type water treatment equipment. As shown in FIG. 4, the cleaning of the trickling filter type water treatment apparatus is carried out by first irradiating light having a wavelength that pests living in the water tank 11 repel toward the vicinity of the water surface of the inner wall of the water tank 11. A process (step S101) is performed. In the light irradiation step, as described in the explanation of FIG. It is preferable to irradiate the entire circumference of the portion in contact with the water surface and the upper portion thereof. The light irradiation process of step S101 is continuously performed until the process 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 water. Specifically, water is supplied to the water tank 11 after the valve V is closed.

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

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

A so-called aeration washing process may be performed in which air is jetted from the air jet tube T3 to agitate the filter media 16a of the filter media layer 16 to remove sludge adhering to the filter media 16a and suspended matter in water. This aeration cleaning process can be optionally performed after the water filling process of step S102 and after the submerged state maintaining process of step S103.

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

Moreover, in the present embodiment, an example in which the frame 13 is provided with the light emitting diode 14 has been described. However, the light-emitting diodes 14 are not limited to being provided on the frame 13 , and may be provided on the inner wall of the water tank 11 , for example. Alternatively, 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, and the emitted light L may be irradiated into the water tank 11 from the light guide member.

As described above, according to the trickling filter type water treatment apparatus 10 according to the present invention, the light emitting diode 14 irradiates the inner wall of the water tank 11 with light having a wavelength that pests repel, when water is filled. As a result, pests such as larvae of the filter bed fly cannot escape upward along the inner wall of the water tank 11 and sink under the water surface and suffocate to death, so pests can be killed more effectively. becomes. As a result, it is possible to efficiently remove pests from the trickling filter type water treatment apparatus.

In addition, pests living in the water tank 11 of the trickling filter-type water treatment apparatus 10 try to escape above the water surface along the inner walls and carriers of the water tank 11 as the water level rises. Since the pests are irradiated with light of wavelengths that pests repel, pests cannot withdraw above the water surface and suffocate to death below the water surface. And, when the water is discharged, it is flushed out together with the discharged water, so the pests can be effectively removed.

A trickling filter type water treatment apparatus 10 according to a second embodiment will be described. The trickling filter type water treatment apparatus 10 according to the second embodiment differs from the trickling filter type water treatment apparatus 10 according to the first embodiment in the irradiation range of the emitted light L emitted by the light emitting diodes 14 . The rest of the configuration is the same as that of the trickling filter type water treatment apparatus 10 according to the first embodiment, so the description is omitted.

FIG. 5 shows a mode in which emitted light L is emitted from the light emitting diode 14 of the trickling filter type water treatment apparatus 10 according to the second embodiment. A circle indicated by a dashed line in the drawing indicates the spot diameter SD of the emitted light L. As shown in FIG.

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

When a plurality of light-emitting diodes 14 are provided on the frame 13 as in the present embodiment, in the light irradiation step of step S102 described in the first embodiment, the emitted light L is directed to the vicinity of the water surface of the inner wall of the water tank 11 and the water tank. It is preferable that the emitted light L is emitted toward the water surface of 11 .

As described above, by irradiating the water surface and the upper part of the inner wall of the tank with light of the above specific wavelength, harmful organisms such as fly larvae can escape to the water surface along the inner wall and carrier of the tank. can be stopped and kept under water, effectively suffocating them to death. As a result, it is possible to efficiently remove pests from the trickling filter type water treatment apparatus.

Moreover, pests living in the water tank 11 are not limited to the inner wall of the water tank 11, and may escape to the surface of the water by traveling along the filter media or the like that floats on the surface of the water. In this way, by irradiating the water surface with light having a wavelength that pests repel, the filter media floating on the water surface are also irradiated with the above-mentioned light, making it impossible for pests to evacuate to the surface of the water through the filter media. Pests can be killed more effectively.

REFERENCE SIGNS LIST 10 sprinkle filter bed water treatment device 11 water tank 12 sprinkler device 14 light emitting diode 16 filter medium layer 16a filter medium

Claims (4)

a water tank for biological reaction treatment of water to be treated;
a filter medium layer filled in the water tank;
a water sprinkler that sprinkles the water to be treated from the top of the water tank toward the filter medium layer;
a discharge port for discharging treated water that has passed through the filter media layer ;
a valve that opens and closes the outlet;
A method for cleaning a trickling filter bed type water treatment apparatus comprising an air ejection pipe for ejecting air toward the filter medium layer ,
a water-filling step of filling the water tank with water after closing the valve and immersing the filter medium layer in the water;
After the water-filling step, the filter media layer was immersed in the water while irradiating the inner wall and the entire water surface of the water tank with light having a wavelength that pests living in the water tank that cannot survive in the water repel. a light irradiation submerged state maintaining step of maintaining the state for 8 hours or more;
After the water filling step, an aeration stirring step of jetting air from the air jet pipe to stir the filter media in the filter media layer;
After the light irradiation submerged state maintaining step, the step of discharging the water,
A method of cleaning a trickling filter type water treatment apparatus , wherein the aeration stirring step is performed while the light irradiation submerged state maintaining step is being performed . 2. The method for cleaning a trickling filter bed water treatment apparatus according to claim 1 , wherein the irradiation of the light to the inner wall and the entire water surface of the water tank is performed before the filling step. 3. The method for cleaning a trickling filter type water treatment apparatus according to claim 1, wherein the light has a wavelength of 300 to 500 nm. 2×1017 photons/m ² The method for cleaning a trickling filter type wastewater treatment apparatus according to any one of claims 1 to 3, wherein the irradiation is performed with an irradiation surface intensity of /s or more.

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