Sprinkling filter bed system and cleaning method

Abstract

To provide a trickling filter system and a cleaning method that enable efficient extermination of organisms to be exterminated.SOLUTION: A system includes a tank filled with a carrier that performs biological treatment on treated water, a sprinkling pipe that sprinkles treated water to the tank, an ozone generator that generates ozone, and a supply pipe that supplies ozone to at least one of the tank and the treated water.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a sprinkling filter bed system and a cleaning method.

Background Art

[0002] In a water treatment system for treating treated water such as sewage (hereinafter, also simply referred to as a water treatment system), for example, by using a sprinkling filter bed, biological removal of organic pollutants (hereinafter, also simply referred to as organic matter) contained in the treated water is performed. Specifically, in a sprinkling filter bed, for example, the treated water is sprayed onto a carrier on which microorganisms are attached and retained, and the organic matter contained in the treated water is decomposed and removed by the microorganisms attached and retained on the carrier (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in the water treatment system as described above, it is desirable to efficiently exterminate target organisms such as flies generated in the sprinkling filter bed.

Means for Solving the Problems

[0005] In order to efficiently exterminate target organisms, the sprinkling filter bed system in the present invention includes a tank filled with a carrier for performing biological treatment of the treated water, a sprinkler pipe for sprinkling the treated water onto the tank, an ozone generator for generating ozone, and a supply pipe for supplying the ozone to at least one of the tank and the treated water.

Effects of the Invention

[0006] The water-sprinkling filter bed system and cleaning method of the present invention make it possible to efficiently eradicate target organisms. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a diagram illustrating an example configuration of the water treatment system 1000 in the first embodiment. [Figure 2] Figure 2 illustrates an example configuration of the sprinkling filter bed system 900 in a comparative example. [Figure 3] Figure 3 is a diagram illustrating an example of the configuration of the sprinkling filter bed system 100 in the first embodiment. [Figure 4] Figure 4 illustrates a specific example of the supply control process performed by the control device 30. [Figure 5] Figure 5 illustrates a specific example of the supply control process performed by the control device 30. [Modes for carrying out the invention]

[0008] [Water treatment system 1000 in the first embodiment] First, we will describe an example of the configuration of the water treatment system 1000 in the first embodiment. Figure 1 is a diagram illustrating an example of the configuration of the water treatment system 1000 in the first embodiment.

[0009] As shown in Figure 1, the water treatment system 1000 includes, for example, a sprinkler filter bed system 100, a filtration device 200 located upstream of the sprinkler filter bed system 100, and a filtration device 300 located downstream of the sprinkler filter bed system 100.

[0010] The filtration device 200 removes suspended solids (SS) and other substances contained in the water to be treated by filtering the water supplied via line L1, for example. Line L1 is, for example, piping that connects the outside of the water treatment system 1000 to the filtration device 200. Specifically, the filtration device 200 removes suspended solids and other substances contained in the water to be treated by, for example, using a carrier filled in a tank (not shown). The filtration device 200 then supplies the water to be treated, from which suspended solids and other substances have been removed, to the sprinkler system 100 via line L2. Line L2 is, for example, piping that connects the filtration device 200 and the sprinkler system 100.

[0011] The sprinkling filter bed system 100 removes organic matter contained in the water to be treated, supplied via line L2, by biological treatment. The sprinkling filter bed system 100 then supplies the biologically treated water to the filtration device 300 via line L3. Line L3 is, for example, piping connecting the sprinkling filter bed system 100 and the filtration device 300.

[0012] The filtration device 300 removes suspended solids and other particles (for example, suspended solids not removed by the filtration device 200, or suspended solids detached from the filtration device 200) contained in the water to be treated by filtering the water supplied via line L3. Specifically, the filtration device 300 removes suspended solids and other particles contained in the water to be treated by using a carrier filled in a tank (not shown), for example. The filtration device 300 then supplies the water to be treated, from which suspended solids and other particles have been removed, via line L4 to downstream equipment (for example, a sterilization tank that sterilizes the water to be treated). Line L4 is, for example, piping that connects the filtration device 300 and the downstream equipment.

[0013] [Comparative example: Sprinkling filter bed system 900] Next, a comparative example corresponding to the sprinkling filter bed system 100 in the first embodiment will be described. Figure 2 is a diagram illustrating an example of the configuration of the sprinkling filter bed system 900 in the comparative example.

[0014] As shown in FIG. 2, for example, the sprinkling filter bed system 900 has a sprinkling filter bed device 10.

[0015] The sprinkling filter bed device 10 includes, for example, a carrier 11 on which aerobic microorganisms are attached and retained, a filling tank 12 filled with the carrier 11 (hereinafter also simply referred to as tank 12), a water sprinkling pipe 13 for sprinkling the treated water onto the carrier 11, a support member 14 for supporting the carrier 11 filled in the filling tank 12 from below, and a storage tank 15 for temporarily storing the treated water in which biological treatment has been performed on the carrier 11. Note that the carrier 11 is, for example, natural stone, resin, or the like.

[0016] The water sprinkling pipe 13 is installed, for example, in a space 12a (hereinafter also referred to as space portion 12a) above a space 12b (hereinafter also referred to as filling portion 12b) in the filling tank 12 where the carrier 11 is filled, and sprinkles the treated water onto the carrier 11 from above.

[0017] Specifically, the treated water is supplied to the water sprinkling pipe 13 via line L2 by a pump P1 provided in line L2, for example. Note that when the treated water is supplied to the water sprinkling pipe 13 by natural flow due to a water level difference, the pump P1 is not required. In this case, the treated water may be temporarily stored in a storage tank (not shown) provided, for example, in the previous stage of the sprinkling filter bed device 10, and supplied from the storage tank to the water sprinkling pipe 13. The treated water supplied to the water sprinkling pipe 13 is sprinkled from the water sprinkling pipe 13 onto the carrier 11.

[0018] Then, the organic matter contained in the treated water sprinkled onto the carrier 11 is decomposed and removed by microorganisms attached to the carrier 11, for example, as the treated water passes through the carrier 11. After that, the treated water after the decomposition and removal of the organic matter is supplied to the storage tank 15 through a plurality of holes 14a provided in the support member 14, for example, and then temporarily stored in the storage tank 15. Further, the treated water (treated water W in the example shown in FIG. 2) stored in the storage tank 15 is sequentially discharged to the filtration device 300 via line L3, for example.

[0019] In addition, for example, a line L11 for supplying air to the filling tank 12 is attached to the filling tank 12. The line L11 is, for example, a pipe that communicates the outside of the sprinkling filter bed device 10 with the filling tank 12. Note that the line L11 may be attached to, for example, a space portion 12a above a filling portion 12b in the filling tank 12 where the carrier 11 is filled.

[0020] In addition, for example, a line L12 (hereinafter also referred to as a discharge pipe) for discharging the air in the filling tank 12 to the outside is attached to the storage tank 15. The line L12 is, for example, a pipe that communicates the filling tank 12 with the outside of the sprinkling filter bed device 10, and a suction fan F for discharging the air in the filling tank 12 is attached thereto.

[0021] Note that the suction fan F discharges, for example, the air in the filling tank 12 to the line L12, and sucks the air (outside air) supplied from the outside through the line L11 into the filling tank 12.

[0022] In addition, the line L12 may, for example, form a circulation pipe by communicating with the line L11. And in this case, the suction fan F may, for example, circulate at least a part of the air supplied to the filling tank 12 among the line L12, the line L11, the filling tank 12, and the storage tank 15.

[0023] Furthermore, for example, a line L3 for supplying the treated water (treated water W) stored in the storage tank 15 to the filtration device 300 is attached to the storage tank 15. And a pump P2 for supplying the treated water to the filtration device 300 is attached to the line L3. Note that, for example, in addition to the pump P2, other pumps (not shown) for supplying (returning) a part of the treated water stored in the storage tank 15 to the filtration device 200 or the line L2 may be attached to the line L3.

[0024] In other words, line L11 supplies air containing oxygen necessary for microorganisms attached to the carrier 11 to decompose organic matter to the filling tank 12. Line L12 then discharges the air from the filling tank 12 after the oxygen has been consumed by the microorganisms attached to the carrier 11.

[0025] In this case, in the filling tank 12, target organisms such as moth flies, starry moth flies, and pond snails, which feed on microorganisms attached to the carrier 11, may appear. In this case, the number of microorganisms attached to the carrier 11 decreases in the sprinkler filter bed device 10, and the water treatment function (organic matter decomposition function) deteriorates.

[0026] Furthermore, in the filling tank 12, for example, flies may escape to the outside of the watering filter bed device 10, which could lead to hygiene and environmental problems.

[0027] Furthermore, in the filling tank 12, there is a possibility that the feces of organisms to be exterminated, such as flies, may mix with the treated water and flow out, potentially leading to a deterioration of water quality.

[0028] Furthermore, in the filling tank 12, the presence of target organisms such as flies may cause errors in the measurement results regarding the amount of microorganisms attached to the carrier 11.

[0029] Therefore, in the sprinkler filter bed device 10, for example, it is necessary to wash the carrier 11 at an appropriate time to remove the organisms to be eradicated from the filling tank 12.

[0030] In this regard, one possible method for eliminating the target organisms described above is immersion cleaning of the sprinkler filter bed device 10. This immersion cleaning method involves filling the sprinkler filter bed device 10 (filling tank 12 and storage tank 15) with water to be treated, and after a predetermined time (for example, about 12 hours) has elapsed, discharging the water to be treated to clean the carrier 11, etc. This makes it possible to eliminate target organisms in the sprinkler filter bed device 10 and to suppress the reduction of microorganisms attached to the carrier 11.

[0031] However, when performing immersion cleaning as described above, the inflow of water to be treated must be stopped in the sprinkler filter bed device 10 during cleaning. Therefore, in this case, the treatment of the water to be treated must be interrupted in the sprinkler filter bed device 10 during cleaning.

[0032] In contrast, in the sprinkler filter bed system 900, for example, multiple sprinkler filter bed devices 10 may be arranged. This makes it possible for the sprinkler filter bed system 900 to continue treating the water to be treated in the other sprinkler filter bed devices 10 even if some of the sprinkler filter bed devices 10 are being cleaned.

[0033] However, even if the sprinkler system 900 has multiple sprinkler devices 10, if some of the sprinkler devices 10 are being cleaned, the processing load (the amount of water to be treated) on the other sprinkler devices 10 increases in the sprinkler system 900. Therefore, in this case, for example, the decomposition and removal of organic matter in the sprinkler devices 10 may not be sufficiently performed, and the water quality of the treated water may deteriorate.

[0034] Furthermore, when immersion cleaning as described above is performed, for example, a portion of the water to be treated is used as washing water. In this case, the amount of water to be treated decreases, and the power consumption per unit of treated water increases, reducing the energy efficiency of the sprinkler filter bed system 900.

[0035] Therefore, in this embodiment, the sprinkling filter bed system 100 eliminates target organisms by, for example, supplying ozone to the sprinkling filter bed device 10. The sprinkling filter bed system 100 in the first embodiment will be described below.

[0036] [Watering filter bed system 100 in the first implementation] Figure 3 is a diagram illustrating an example configuration of the sprinkling filter bed system 100 in the first embodiment. The differences from the sprinkling filter bed system 900 described in Figure 2 will be explained below. In the following explanation, we will describe the case where the filling tank 12 and the storage tank 15 are integrated, but the filling tank 12 and the storage tank 15 may be provided separately. In addition, in the following explanation, we will describe a sprinkling filter bed system 100 having only one sprinkling filter bed device 10, but the sprinkling filter bed system 100 may have multiple sprinkling filter bed devices 10 and perform treatment on the water to be treated in parallel.

[0037] As shown in Figure 3, the watering filter bed system 100 further includes, for example, an ozone generator 20 and a control device 30.

[0038] The ozone generator 20 is, for example, a device that generates ozone. Specifically, the ozone generator 20 is, for example, a device that generates ozone from an oxygen-containing raw material gas by silent discharge. The ozone generated in the ozone generator 20 is supplied to the filling tank 12 via, for example, line L13 (hereinafter also simply referred to as the supply pipe). As shown in Figure 3, line L13 is, for example, a pipe that connects the ozone generator 20 to the inlet side of the filling tank 12 in line L11. That is, the ozone generated in the ozone generator 20 is supplied to the filling tank 12 in a state mixed with, for example, air passing through line L11.

[0039] Line L13 may, for example, directly connect the ozone generator 20 and the filling tank 12. The ozone generated in the ozone generator 20 may, for example, be directly supplied to the filling tank 12. Line L13 may also, for example, connect the ozone generator 20 to the inlet side of the filling tank 12 in line L2. The ozone generated in the ozone generator 20 may, for example, be supplied to the water to be treated (the water to be treated before being supplied to the filling tank 12) passing through line L2, and then supplied to the filling tank 12 in a mixed state with the water to be treated (in a state where a portion of the ozone is dissolved in the water to be treated).

[0040] In other words, the watering filter bed system 100 in this embodiment includes, for example, a filled tank 12 filled with a carrier 11 that performs biological treatment on the water to be treated, a watering pipe 13 that sprays the water to be treated onto the filled tank 12, an ozone generator 20 that generates ozone, and a line L13 that supplies ozone to at least one of the filled tank 12 and the water to be treated.

[0041] As a result, the sprinkling filter bed system 100 in this embodiment can eliminate target organisms by, for example, ozone supplied to the filling tank 12. Specifically, the sprinkling filter bed system 100 can eliminate not only fly eggs and larvae, but also adult flies. Therefore, the sprinkling filter bed system 100 can eliminate target organisms efficiently without, for example, the need for immersion washing. Specifically, the sprinkling filter bed system 100 can eliminate target organisms without, for example, interrupting the treatment of the water to be treated.

[0042] Furthermore, in the sprinkling filter bed system 100 of this embodiment, for example, it becomes unnecessary to use a portion of the water to be treated as washing water. Therefore, in the sprinkling filter bed system 100, it becomes possible to increase the amount of water to be treated from which organic matter is removed, compared to, for example, when immersion washing is performed. Consequently, in the sprinkling filter bed system 100, for example, the power consumption per unit of treated water can be reduced, and energy saving can be improved.

[0043] Returning to Figure 3, the control device 30 performs a process to control the supply of ozone to the filling tank 12 (hereinafter also referred to as the supply control process) by, for example, controlling the ozone generator 20 and the induced draft fan F. The control device 30 is, for example, a computer device having a CPU (Central Computing Unit) and memory.

[0044] Specifically, the control device 30 controls, for example, the starting and stopping of the ozone generator 20 and the induced draft fan F. The control device 30 also controls, for example, the concentration of ozone generated by the ozone generator 20. A specific example of the supply control process will be described below.

[0045] [Specific example of supply control processing by the control device 30] Figures 4 and 5 illustrate specific examples of supply control processing by the control device 30.

[0046] First, we will explain the first specific example of the supply control process. Figure 4(A) is a flowchart illustrating the first specific example of the supply control process.

[0047] As shown in Figure 4(A), the control device 30 waits, for example, until the ozone supply timing is reached. The ozone supply timing may be, for example, once a week. That is, the control device 30 may perform supply control processing at predetermined intervals according to, for example, the occurrence status of the organisms to be eradicated in the filling tank 12 or the growth cycle of the organisms to be eradicated. The ozone supply timing may also be, for example, the timing when the administrator inputs information indicating the start of ozone supply to the filling tank 12. Furthermore, the ozone supply timing may also be, for example, the timing when the carrier 11 is cleaned. The cleaning of the carrier 11 here refers to, for example, the stirring and cleaning of the carrier 11 by supplying air from an air supply device (not shown), such as an aeration blower, installed in the filling tank 12.

[0048] Then, when it is time to supply ozone (step S1 in Figure 4(A)), the control device 30 generates ozone by controlling the ozone generator 20, for example, and supplies ozone to the filling tank 12 from line L13 (lines L11 and L13) (step S2 in Figure 4). Specifically, in this case, the control device 30 continuously supplies ozone to the filling tank 12 until a predetermined time (hereinafter also referred to as the first time) has elapsed. The first time is not particularly limited, but may be, for example, a few minutes.

[0049] In other words, when it is time to supply ozone, for example, the control device 30 activates the induced fan F and supplies ozone to the filling tank 12, thereby supplying ozone to both the filling tank 12 (space section 12a and filling section 12b) and the storage tank 15.

[0050] This makes it possible for the control device 30 to eliminate target organisms that have occurred in, for example, the filling tank 12 and the storage tank 15.

[0051] Next, we will explain a second specific example of the supply control process. Figure 4(B) is a flowchart illustrating the second specific example of the supply control process.

[0052] As shown in Figure 4(B), the control device 30 waits, for example, until it is time to supply ozone.

[0053] Then, when it is time to supply ozone (step S11 in Figure 4(B)), the control device 30 stops the discharge of air from the storage tank 15 to line L12 by controlling, for example, the induced fan F (step S12 in Figure 4(B)). Furthermore, in this case, the control device 30 generates ozone by controlling, for example, the ozone generator 20, and supplies ozone to the filling tank 12 from line L13 (line L11 and line L13 in the example shown in Figure 3) (step S13 in Figure 4(B)).

[0054] In other words, the control device 30, for example, when supplying ozone to the filling tank 12, stops the discharge of air from the filling tank 12, thereby temporarily retaining the ozone supplied to the filling tank 12. Then, the control device 30 uses the ozone to eliminate target organisms that have been generated in the filling tank 12.

[0055] In particular, as shown in Figure 3, when supplying ozone from line L11 to the space 12a, if the discharge of air from the storage tank 15 is stopped, much of the ozone supplied to the filling tank 12 remains in the space 12a because the carrier 11 acts as an obstacle. Also, most of the adult flies that breed in the filling tank 12 are located in the space 12a. Therefore, the control device 30 can, for example, increase the ozone concentration in the space 12a and efficiently eliminate adult flies in the space 12a by stopping the discharge of air from the storage tank 15 when starting to supply ozone to the filling tank 12.

[0056] Subsequently, the control device 30 restarts the discharge of air from the storage tank 15 to the line L12 by controlling the induction fan F after a predetermined time (hereinafter also referred to as the second time) has elapsed since the start of the process in S13 (step S14 in Figure 4(B)). The predetermined time here may be, for example, the time necessary to exterminate the adult flies that have formed in the space 12a. The second time is not particularly limited, but may be, for example, several minutes to several tens of minutes.

[0057] In other words, for example, after two hours have elapsed since the start of processing in S13, the control device 30 discharges ozone from the storage tank 15 to the line L12, thereby attracting the ozone remaining in the space 12a to the filling section 12b of the carrier 11 and the storage tank 15. The control device 30 then uses ozone to eliminate target organisms (e.g., fly eggs and larvae) that have formed in the filling section 12b and the storage tank 15.

[0058] Here, the ozone supplied to the filling tank 12 may be harmful to microorganisms attached to the carrier 11, for example, depending on its concentration. Therefore, the control device 30 supplies ozone with a reduced concentration to the filling section 12b by, for example, activating the induced fan F two hours after the start of ozone supply to the space section 12a.

[0059] As a result, the control device 30 can, for example, eliminate target organisms that have occurred in the filling tank 12 and the storage tank 15 (hereinafter also referred to as the filling tank 12, etc.) while suppressing the death of microorganisms attached to the carrier 11.

[0060] In the examples described in Figures 4(A) and 4(B), the ozone supply to the filling tank 12 is stopped after 1 hour has elapsed since the start of the ozone supply, but this is not the only example. The ozone supply to the filling tank 12 may be, for example, carried out continuously.

[0061] Next, we will explain a third specific example of the supply control process. Figure 5(A) is a flowchart illustrating the third specific example of the supply control process.

[0062] As shown in Figure 5(A), the control device 30 determines, for example, whether or not target organisms such as flies are present in the filling tank 12.

[0063] Specifically, the control device 30 may acquire image data of the space 12a captured by an imaging device (not shown), such as a camera. The control device 30 may then identify the number of flies that appear in the acquired image data (for example, the number of flies resting on the inner wall of the filling tank 12 or on the sprinkler pipe 13). If the control device determines that the number of flies in the image data is greater than or equal to a predetermined number, it may determine that flies or other organisms to be exterminated have appeared in the filling tank 12, etc.

[0064] Then, if it is determined that the organism to be eradicated is present in the filling tank 12 or the like (YES in step S21 of Figure 5(A)), the control device 30 increases the concentration of ozone generated in the ozone generator 20 by controlling the ozone generator 20, for example (step S22 of Figure 5(A)). Specifically, the control device 30 controls the ozone to be higher when the next supply of ozone to the filling tank 12 is performed.

[0065] On the other hand, if it is determined that no organisms to be eradicated are present in the filling tank 12, etc. (NO in step S21), the control device 30 will not perform the process in step S22, for example.

[0066] In other words, if organisms to be eradicated are present in the filling tank 12, etc., it means that the concentration of ozone supplied to the filling tank 12 is insufficient. Therefore, in this case, the control device 30 controls the concentration of ozone generated in the ozone generator 20 to be higher.

[0067] This enables the control device 30 to stably eliminate target organisms in, for example, the filling tank 12.

[0068] Furthermore, the control device 30 may also perform the process in step S22 if, for example, information indicating the presence of organisms to be eradicated is entered by the administrator (i.e., if the administrator confirms the presence of organisms to be eradicated in the filling tank 12, etc.). In addition, if, for example, the control device 30 determines that organisms to be eradicated are present (YES in step S21) and the ozone generator 20 is stopped, it may start the ozone generator 20 and begin generating ozone.

[0069] Next, we will explain the fourth specific example of the supply control process. Figure 5(B) is a flowchart illustrating the fourth specific example of the supply control process.

[0070] As shown in Figure 5(B), the control device 30 determines, for example, whether the microbial activity attached to the carrier 11 in the packed tank 12 has decreased. Specifically, the control device 30 refers to the values ​​measured by measuring instruments (not shown) attached to lines L2 and L3, respectively, and determines that if the organic matter removal rate associated with the inflow of treated water into the sprinkler filter bed device 10 falls below a predetermined threshold, it determines that the decomposition of organic matter in the packed tank 12 is insufficient and that the microbial activity attached to the carrier 11 has decreased.

[0071] If the control device 30 determines that the microbial activity attached to the carrier 11 has decreased (YES in step S31 of Figure 5(B)), the control device 30 lowers the concentration of ozone generated in the ozone generator 20 by controlling the ozone generator 20, for example (step S32 of Figure 5(B)).

[0072] On the other hand, if it is determined that the microbial activity attached to the carrier 11 has not decreased (NO in step S31), the control device 30 will not perform the process in step S32, for example.

[0073] In other words, a decrease in the activity of microorganisms attached to the carrier 11 occurs when some of the microorganisms attached to the carrier 11 are killed by the ozone supplied to the packing tank 12. Therefore, in this case, the control device 30 controls the concentration of ozone generated in the ozone generator 20 to be lower.

[0074] This makes it possible for the control device 30 to suppress, for example, the decrease in the activity of microorganisms attached to the carrier 11.

[0075] Furthermore, if the control device 30 determines that the microbial activity attached to the carrier 11 has decreased (YES in step S31), and the ozone generator 20 is running, it may stop the ozone generator 20 and interrupt ozone generation.

[0076] In other words, the watering filter bed system 100 in this embodiment further includes a control device 30 that controls, for example, the supply of ozone from line L13. The watering filter bed system 100 also further includes, for example, line L12 that discharges ozone from the filling tank 12. Line L13 is installed, for example, above the carrier 11 in the filling tank 12, and line L12 is installed, for example, below the carrier 11 in the filling tank 12. The control device 30 stops the discharge of ozone from the filling tank 12 by line L12, and in response to the cessation of ozone discharge, starts supplying ozone to the filling tank 12 by line L13. After a predetermined time (second time) has elapsed since the start of ozone supply, it resumes the discharge of ozone from the filling tank 12 by line L12.

[0077] As a result, the watering filter bed system 100 in this embodiment can eliminate target organisms that have been generated in, for example, the filling tank 12, while preventing the death of microorganisms attached to the carrier 11.

[0078] Furthermore, in the sprinkling filter bed system 100, by supplying ozone to the filling tank 12, etc., it becomes possible to decompose organic matter contained in the treated water with ozone, for example, and to deodorize the filling tank 12, etc. In addition, in the sprinkling filter bed system 100, by supplying ozone to the filling tank 12, etc., it becomes possible to promote the autodigestion of microorganisms attached to the carrier 11, for example, and to reduce the cost required for the disposal of these microorganisms.

[0079] The watering filter bed system 100 may also include, for example, an air supply device (not shown) such as an aeration blower that supplies air into the filling tank 12 to agitate (for example, agitate and wash) the carrier 11, and the control device 30 may operate the air supply device while supplying ozone to at least one of the filling tank 12 and the water to be treated, and supply air from the air supply device into the filling tank 12.

[0080] This allows the watering filter bed system 100 to uniformly contact the carrier 11 in the packed tank 12 when supplying ozone to the packed tank 12.

[0081] Specifically, the control device 30 may, for example, supply air from the air supply to the filling tank 12 during or after the execution of step S2 in Figure 4(A). Alternatively, the control device 30 may, for example, supply air from the air supply to the filling tank 12 after the execution of step S14 in Figure 4(B).

[0082] Furthermore, at least a portion of either the inner wall or the outer wall of the filling tank 12 may be covered with an ozone corrosion prevention material.

[0083] This makes it possible for the watering filter bed system 100 to prevent, for example, corrosion of the inner and outer walls of the filling tank 12 due to ozone in the filling tank 12.

[0084] Furthermore, line L12 may be fitted with, for example, a net (not shown) with a mesh smaller than the size of an adult fly at the inlet side of the attracting fan F.

[0085] As a result, the sprinkler filter bed system 100 can prevent, for example, adult flies generated in the storage tank 15 from reaching the attracting fan F, thereby preventing malfunction of the attracting fan F and preventing adult flies from escaping the system.

[0086] Furthermore, line L12 may be equipped with, for example, a decomposition device (not shown) at the outlet side of the induced draft fan F to decompose ozone discharged from the storage tank 15. The decomposition device may be, for example, a tank filled with activated carbon or an ultraviolet irradiation device.

[0087] This makes it possible for the sprinkling filter bed system 100 to prevent the release of ozone to the outside, even if, for example, some of the ozone supplied to the filling tank 12 is discharged from the storage tank 15.

[0088] Furthermore, the control device 30 may, for example, while ozone is being supplied to the filling tank 12, refer to a value measured by a measuring instrument (not shown) attached to at least one of the line L12 and the storage tank 15, and if it determines that the amount of ozone contained in the air in the storage tank 15 or the air passing through line L12 (i.e., the amount of ozone not used to exterminate the target organisms) is above a predetermined threshold, control the ozone generator 20 to lower the concentration of ozone generated in the ozone generator 20.

[0089] This makes it possible for the sprinkler filter system 100 to suppress the amount of ozone discharged from, for example, the storage tank 15. [Explanation of Symbols]

[0090] 10: Sprinkling filter bed system 11: Carrier 12: Filling tank 12a: Space part 12b: Filling section 13: Sprinkler pipe 14: Support member 14a: Hole 15: Storage tank 20: Ozone generator 30: Control device 100: Sprinkler filter bed system 200: Filtration device 300: Filtration device 900: Sprinkling filter bed system 1000: Water treatment system F: Induction fan L1: Line L2: Line L3: Line L4: Line L11: Line L12: Line L13: Line P1: Pump P2: Pump W: Water to be treated

Claims

1. A tank filled with a carrier that performs biological treatment on the water to be treated, A first supply pipe supplies the water to be treated into the tank from the upstream equipment of the tank, A sprinkler pipe for sprinkling the water to be treated supplied into the tank, An ozone generator that produces ozone, A second supply pipe for supplying the ozone to at least one of the tank and the water to be treated, A first discharge pipe for discharging the ozone from the tank, A sprinkler filter bed system comprising: a second discharge pipe for discharging the treated water from the tank to downstream equipment of the tank.

2. Furthermore, the watering filter bed system according to claim 1 is further equipped with a control device for controlling the supply of ozone from the second supply pipe.

3. The control device controls the discharge of ozone from the first discharge pipe, as described in claim 2 of the watering filter bed system.

4. The second supply pipe is installed above the carrier in the tank, The first discharge pipe is installed below the carrier in the tank, The control device is The discharge of ozone from the tank by the first discharge pipe is stopped, In response to the cessation of ozone discharge, the supply of ozone to the tank by the second supply pipe is started. The watering filter bed system according to claim 3, wherein the discharge of ozone is resumed after a predetermined time has elapsed since the start of the supply of ozone.

5. A tank filled with a carrier that performs biological treatment on the water to be treated, A first supply pipe supplies the water to be treated into the tank from the upstream equipment of the tank, A sprinkler pipe for sprinkling the water to be treated supplied into the tank, An ozone generator that produces ozone, A second supply pipe that does not supply the ozone to the water to be treated, but directly supplies the ozone to the tank, A sprinkler filter bed system comprising: a discharge pipe for discharging the treated water from the tank to downstream equipment of the tank.

6. A tank filled with a carrier that performs biological treatment on the water to be treated, A sprinkler pipe for spraying the water to be treated onto the tank, An ozone generator that produces ozone, A supply pipe for supplying the ozone to at least one of the tank and the water to be treated, A discharge pipe for discharging the ozone from the tank, The system includes a control device for controlling the supply of ozone from the supply pipe, The control device is a sprinkler filter system that controls the discharge of ozone from the discharge pipe.

7. A cleaning method for a water-sprinkling filter bed system comprising: a tank filled with a carrier that performs biological treatment on the water to be treated; a sprinkler pipe for sprinkling the water to be treated onto the tank; an ozone generator for generating ozone; a supply pipe for supplying the ozone to at least one of the tank and the water to be treated; and a discharge pipe for discharging the ozone from the tank, wherein the supply pipe is installed above the carrier in the tank and the discharge pipe is installed below the carrier in the tank, The discharge of ozone from the tank by the discharge pipe is stopped. In response to the cessation of ozone discharge, the supply of ozone to the tank via the supply pipe is started. A cleaning method comprising restarting the discharge of ozone after a predetermined time has elapsed since the start of the supply of ozone.

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