JP2018167194A - Sprinkler and sprinkler type cleaner - Google Patents

Abstract

To uniformly provide wastewater to an entire tank, even when a flow rate of the wastewater to be supplied to a device is reduced.SOLUTION: There is provided a sprinkler that sprinkles wastewater supplied by a wastewater supply pipe from above a device main body filled with a microorganism holding carrier that holds a large number of microorganisms, the sprinkler including: a receiving member for receiving the wastewater falling from an outflow hole provided on the wastewater supply pipe; a drain pipe having an introduction part disposed at a center in a top view of the device main body and extending downward from the receiving member and a plurality of discharge parts radially extending from a lower end portion of the introduction part, for discharging the wastewater flowing in from the introduction part from each of the plurality of discharge pipes; and a helical structure body which is removably provided inside of the drain pipe and causes the wastewater flowing into the drain pipe from the receiving member to flow down along an inner peripheral surface of the drain pipe.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a watering device and a watering purification device.

  Purification using the DHS (Downflow Hanging Sponge) method in which sewage (treated water) is sprinkled on the microorganism holding carrier filled in the hollow device body and the sewage is aerobically purified by the decomposition function of microorganisms held by the microorganism holding carrier. An apparatus (DHS reactor) has been developed. As a method of supplying sewage in a DHS reactor over a wide range and evenly, for example, while rotating a tube extending in the horizontal direction at a constant speed around one end side of the tube, There is a method of flowing down sewage (see Patent Document 1). In addition to this, there is a method in which supplied sewage is dropped from a large number of holes provided on the bottom surface of the dish-like member (see Patent Document 2).

Japanese Patent Laid-Open No. 2006-123957 JP 2012-179517 A

  For example, the purifying device of Patent Document 1 causes the sewage to flow down from a large number of holes of the pipe body while rotating the pipe body at a constant speed. An auxiliary drive source that is used until the body rotation speed reaches a constant speed is required. Therefore, the running cost of the power source (including the auxiliary drive source) and the maintenance of the movable part are required. When the tube is rotated at a constant speed, a circular cross section is suitable for the tank. However, when the shape of the place where the purification apparatus is installed is taken into account, it may be appropriate that the cross-sectional shape of the tank is rectangular instead of circular. When the tubular body is rotated at a constant speed in a rectangular tank, there will be a region where the sewage is not supplied when water is sprinkled, and the function of decomposing microorganisms held by the microorganism holding carrier is present. It cannot be used effectively. Moreover, in the purification apparatus of patent document 1, since the pipe is rotated at a constant speed, it is necessary to control the flow rate of the supplied sewage.

  On the other hand, the purification device of Patent Document 2 drops the supplied sewage from a large number of holes provided on the bottom surface of the dish-like member, and thus restricts, in other words, the flow rate of the sewage supplied to the dish-like member. When the flow rate of sewage is reduced, the sewage is not diffused throughout the dish-like member. As a result, sewage is dripped only from a part of the hole provided in the bottom of the dish-like member, and the microorganisms decomposition function held by the microorganism holding carrier cannot be used effectively. Therefore, in the case of the purification device of Patent Document 2, it is necessary to control the flow rate of the sewage so that the sewage is diffused throughout the dish-shaped member.

  An object of the present invention is to provide a watering purification device that can uniformly supply sewage to the entire tank even when the flow rate of sewage supplied to the device is reduced.

  In order to solve the above-described problems, a watering device according to the present invention is a watering device for spraying sewage supplied from a water supply pipe from above a device main body filled with a microorganism holding carrier that holds a large number of microorganisms. A receiving member that receives the sewage falling from the outflow pipe provided in the water supply pipe, an introduction portion that is disposed in the center of the apparatus main body in a top view and extends downward from the reception member; and A plurality of discharge portions extending radially from a lower end portion, and a drainage pipe for discharging the sewage flowing from the introduction part from each of the plurality of discharge pipes, and detachably provided inside the drainage pipe And a spiral structure for allowing the sewage flowing into the drain pipe from the receiving member to flow down along the inner peripheral surface of the drain pipe.

  Further, the watering type purification apparatus of the present invention includes the watering apparatus described above, an apparatus main body filled with a microorganism holding carrier for holding a large number of microorganisms, and treated water purified by the microorganism holding carrier filled in the apparatus main body. And a water collecting part for collecting water.

  According to the present invention, even when the flow rate of supplied sewage is reduced, sewage can be supplied uniformly to the entire tank. As a result, the function of decomposing microorganisms held by the microorganism holding carrier filled in the tank can be used effectively, and the sewage can be purified aerobically.

It is a schematic diagram of the watering type purification apparatus of this embodiment. It is a top view of the apparatus main body in the watering type purification apparatus shown in FIG. (A) It is AA sectional drawing which shows the structure of the water sprinkling part before inserting a helical structure, (b) AA sectional drawing which shows the state of the watering part after inserting a helical structure. (A) Perspective view of spiral structure, (b) Top view of spiral structure, (c) Bottom view of spiral structure. (A) Sprinkling rate when fresh water is sprinkled in a sprinkling part not using a coil spring, (b) Sprinkling rate when sprinkling fresh water in a sprinkling part using a 38 mm coil spring, (c) A 69 mm coil spring It is a figure which shows the watering rate when sprinkling fresh water in the used watering part. It is a schematic diagram of a sprinkling amount distribution measuring apparatus. It is a top view which shows the watering position of a watering amount distribution measuring apparatus. It is a top view of a measuring rod. (A) Watering rate when R = 100 mm, (b) Watering rate when R = 150 mm, (c) Results of watering rate when R = 170 mm. (A) Range in which fresh water is diffused to the filling part when water is sprayed at a position close to the center of the apparatus main body, (b) Fresh water is filled when water is sprayed at a position away from the center of the apparatus main body It is a figure which shows typically the range diffused to a part. It is a figure which shows the watering rate when spraying sewage in the watering part which does not use the watering rate which sprinkled sewage in the watering part using a spiral structure, and the spiral structure.

  Hereinafter, the watering purification apparatus of this embodiment is demonstrated using drawing. The sprinkling type purification apparatus of the present embodiment is used as a part of an organic wastewater treatment apparatus, for example, and purifies sewage that has been anaerobically treated by, for example, a UASB (Up-flow Anaerobic Sludge Blanket) reactor by an aerobic biological treatment. It is a watering type purification device. The sprinkling type purification device sprays the sewage supplied from the sewage water supply pipe to a large number of microorganism holding carriers filled in the main body of the device, and utilizes the microbial decomposition function held by the microorganism holding carrier to aerobate the sewage. It is a device to purify automatically.

As shown in FIGS. 1 to 3, the watering purification device 10 includes a device main body 15, a watering portion (watering device) 16, and the like. The main body 15 has a cross-sectional shape orthogonal to the longitudinal direction, in other words, the outer shape of the main body 15 in a top view is a square shape or a rectangular shape. A plurality of the water sprinkling parts 16 of the present embodiment are arranged in a matrix shape (lattice shape) according to the size and shape of the apparatus main body 15. Since the size of the apparatus main body 15 in a top view is typically a square shape or a rectangular shape of several meters to several tens of meters × several tens to several tens of meters, as represented by, for example, 10 m × 20 m. In the top view of the apparatus main body 15, the water sprinkling unit 16 is arranged at a ratio of one in a square area A having a width L ₁ and a depth L ₂ of 50 cm to ₁ m, for example. Here, the apparatus main body 15 may be partitioned by using a partition plate so that the region in the device body 15 has a square shape of L ₁ = L ₂ = 50 cm to ₁ m, or may not be partitioned.

  The apparatus body 15 is installed on a gantry not shown. The apparatus main body 15 has a perforated bottom plate 18 on the lower end side of the internal space. The apparatus main body 15 has a pressing member 19 above the perforated bottom plate 18. A space between the perforated bottom plate 18 and the pressing member 19 inside the apparatus main body 15 is filled with a large number of microorganism holding carriers 20. Hereinafter, a space filled with a large number of microorganism holding carriers 20 is referred to as a filling portion 21. The apparatus main body 15 has an exhaust pipe 22 that maintains the inside of the apparatus main body 15 in an open air state below the perforated bottom plate 18. In the present embodiment, the pressing member 19 is provided inside the apparatus main body 15, but the configuration of the pressing member 19 may be omitted.

  The apparatus main body 15 has a water collecting part 26 that collects treated water that drops and passes through the hole 18a of the perforated bottom plate 18 of the apparatus main body 15 at the lower end. The drain pipe 27 is provided in the water collection part 26, and discharges the treated water collected by the water collection part 26 to the outside. In FIG. 1, in order to eliminate the complexity of the drawing, only a part of the hole 18 a of the perforated bottom plate 18 is given a reference numeral.

  The water sprinkling part 16 sprinkles sewage supplied from the outflow hole 28 a of the sewage water supply pipe (header pipe) 28 from above the filling part 21. The water sprinkling unit 16 includes a receiving member 31, a drain pipe 32, and a branch pipe 33. In addition, although the drain pipe 32 and the branch pipe 33 are made into the separate body, it is good also as one member.

The receiving member 31 is a bowl-shaped member having an upper surface opened. The receiving member 31 receives the sewage flowing down from the outflow hole 28 a of the sewage water supply pipe 28 and discharges the received sewage to the drain pipe 32. The receiving member 31 has an insertion hole 35 for discharging the received dirty water to the drain pipe 32 on the bottom surface. As shown in FIG. 2, the position of the insertion hole 35 on the bottom surface of the receiving member 31 is shifted from the center C of the receiving member 31 by a predetermined amount in the −y direction in FIG. 2. When the length of the receiving member 31 in the y direction in FIG. 2 is W, the center C of the receiving member 31 is a position W / 2 from the end of the receiving member 31.
The insertion hole 35 is countersunk on the bottom surface side of the receiving member 31. Accordingly, the insertion hole 35 is a stepped hole in which the bottom surface side of the receiving member 31 is the large diameter portion 35a and the lower surface side of the receiving member 31 is the small diameter portion 35b.

Assuming that the position corresponding to the outflow hole 28a of the sewage water supply pipe 28 in the top view of the water spray purification device 10 is P1, the outflow hole 28a of the sewage water supply pipe 28 is shown in FIG. The position is shifted in the middle y direction. As described above, the insertion hole 35 in the bottom surface of the receiving member 31 is located at a position shifted from the center C of the receiving member 31 by a predetermined amount in the −y direction in FIG. Therefore, the sewage flowing out from the outflow hole 28 a of the sewage water supply pipe 28 falls to a position shifted from the insertion hole 35 of the receiving member 31 and then flows toward the peripheral edge of the insertion hole 35 of the receiving member 31. Then, it flows into the drain pipe 32 from the peripheral edge of the drain pipe 32. As described above, the water sprinkling part 16 is _{1 in} a square area (reference symbol A in FIG. 2) in which the width L ₁ and the depth L ₂ are L ₁ = L ₂ = 50 cm to ₁ m in the top view of the apparatus main body 15. Are arranged. Receiving member 31, the center of the insertion hole 35, from the apex in the drawing the upper-left corner of the area A of the positive rectangular shape, the length L ₃ in the x-direction _{(= L 1/2),} - y direction length L _{4 (=} L _2/2) position of, in other words, the centers of the insertion holes 35 of the region a of the positive rectangular shape are arranged to coincide.

  The drain pipe 32 is fixed to the receiving member 31 in a state of being inserted into the insertion hole 35 from the lower surface side of the receiving member 31. In a state where the drain pipe 32 is fixed to the receiving member 31, the upper end portion of the drain pipe 32 is flush with the step surface 35 c provided in the insertion hole 35. As the drain pipe 32, for example, a steel circular pipe is used.

  The branch pipe 33 includes an introduction part 33a extending downward, and four discharge parts 33b extending radially from the lower end side of the introduction part 33a to the introduction part 33a and inclined downward toward the tip. Have. In addition, the four discharge parts 33b provided radially are extended at intervals of, for example, 90 ° in the circumferential direction of the introduction part 33a. The branch pipe 33 is made of a synthetic resin such as polyvinyl chloride (PVC). The introduction part 33a and the four discharge parts 33b are circular pipes. Each of the four discharge parts 33b has a nozzle 42 that changes the flow of discharged sewage at the tip. When the discharge portion 33b is a circular tube whose tip is bent downward, the nozzle 42 need not be used. As shown in FIG. 1, when the tip of the nozzle 42 is inclined downward, if the flow rate of sewage flowing from the receiving member 31 to the inside of the branch pipe 33 is small, the sewage is other than the lowest point of the nozzle 42. May fall between the water spray plates 61 provided in the region A due to the Coanda effect, and may fall directly on the filling portion 21 instead of the water spray plate 61. Therefore, the tip shape of the nozzle 42 may be a shape that extends in the vertical direction (for example, the −z direction in FIG. 1) instead of the downwardly inclined shape.

As described above, one water sprinkling part 16 is arranged in a square area A having a width L ₁ and a depth L ₂ of L ₁ = L ₂ = 50 cm to ₁ m in the top view of the apparatus main body 15. Therefore, each discharge portion 33 b of the branch pipe 33 is disposed at a position facing each vertex of the square area A in the top view of the apparatus main body 15. The number of discharge portions 33b provided in the branch pipe 33 is the same as the number of vertices of the square area A in the top view of the apparatus body 15, that is, four discharge portions provided in the branch pipe 33. It is not necessary to match the number 33b with the number of vertices of the square area A in the top view of the apparatus main body 15. In addition, when the area where the water sprinkling part 16 is arranged is a polygonal shape, a branch pipe having a number of discharge parts corresponding to the number of vertices in the top view of the apparatus main body 15 may be used. The branch pipe 33 of the present embodiment may be used.

  The spiral structure 50 is detachable from the water sprinkling unit 16. As shown in FIG. 3B, the spiral structure 50 may be inserted across the introduction part 33 a of the drain pipe 32 and the branch pipe 33 through the insertion hole 35 of the receiving member 31. As shown in FIG. 4A, the spiral structure 50 includes, for example, a coil spring 51, an upper plate 52 to which the upper end portion of the coil spring 51 is fixed, and a lower plate 53 to which the lower end portion of the coil spring 51 is fixed. And have.

  The coil spring 51 has a function of causing the sewage flowing into the drain pipe 32 to flow down along the winding direction of the coil spring 51. The outer diameter D1 of the coil spring 51 is set to be smaller than the inner diameter D2 of the drain pipe 32 and the inner diameter D3 of the introduction portion 33a of the branch pipe 33. Specifically, the outer diameter D1 of the coil spring is such that when the coil spring 51 is inserted across the introduction portion 33a of the drain pipe 32 and the branch pipe 33, the coil spring 51 is the inner peripheral surface of the drain pipe 32 or the branch pipe 33. The flow of sewage that has flowed into the drain pipe 32 in the vicinity of the inner peripheral surface of the inlet portion 33a is made to flow along the inner peripheral surface of the drain pipe 32 or the inner peripheral surface of the inlet portion 33a of the branch pipe 33. Is set to be possible.

  As shown in FIG. 4B, the upper plate 52 is a disk-shaped member having a circular opening 54 at the center. The inner diameter D4 of the opening 54 is substantially the same as the inner diameter D5 of the coil spring 51. The upper plate 52 has four cutout portions 55 that are continuous with the opening 54 and cut out in an arc shape. As an example, the notches 55 are provided at intervals of 90 ° in the circumferential direction. The length H1 in the radial direction of the notch 55 is substantially the same as the wire diameter of the coil spring 51, for example. Since the upper plate 52 has the notch 55 connected to the opening 54 of the upper plate 52 itself, the sewage flowing into the drain pipe 32 can be directly flowed down to the coil spring 51. In addition, the notch part 55 may be provided according to the number of the discharge parts 33b of the branch pipe 33, and the notch part 55 does not need to be provided.

  The upper plate 52 is accommodated in the large-diameter portion 35a of the insertion hole 35 of the receiving member 31 when the helical structure 50 is inserted from the insertion hole 35 of the receiving member 31 into the introduction portion 33a of the drain pipe 32 and the branch pipe 33. The In a state where the upper plate 52 is housed in the large diameter portion 35 a of the insertion hole 35 of the receiving member 31, the outer peripheral edge portion of the lower surface of the upper plate 52 is brought into contact with the step surface 35 c of the insertion hole 35 of the receiving member 31. By accommodating the upper plate 52 in the large diameter portion 35 a of the insertion hole 35 of the receiving member 31, filth adheres to the outer peripheral surface of the upper plate 52 in the process of supplying sewage from the sewage water supply pipe 28 to the receiving member 31. To prevent that. Further, the upper plate 52 is gripped by an operator when the spiral structure 50 is cleaned, and makes it easy to remove the spiral structure 50 from the sprinkler 16.

  As shown in FIG. 4C, the lower plate 53 is a disk-shaped member having a circular opening 57 at the center. The outer diameter D6 of the lower plate 53 is set to be smaller than the inner diameter D2 of the drain pipe 32 and the inner diameter D3 of the introduction portion 33a of the branch pipe 33. The inner diameter D7 of the opening 57 of the lower plate 53 is set to be substantially the same as the inner diameter D5 of the coil spring 51. The lower plate 53 has four cutout portions 58 that are continuous with the opening 57 and cut out in an arc shape. The notches 58 are provided at intervals of 90 ° as an example. The length H2 in the radial direction of the notch 58 is substantially the same as the wire diameter of the coil spring 51, for example.

  Since the lower plate 53 has the notch 58 connected to the opening of the lower plate 53, when the sewage flowing down along the winding direction of the coil spring 51 reaches the lower plate 53, the sewage is notched. Water can be dropped from each of 58. Therefore, when the spiral structure 50 is inserted from the insertion hole 35 of the receiving member 31 into the drain pipe 32 and the introduction part 33 a of the branch pipe 33, the notch part 58 of the lower plate 53 is formed on the discharge part 33 b of the branch pipe 33. It is preferable to arrange at positions corresponding to each. In addition, the notch part 58 may be provided according to the number of the discharge parts 33b of the branch pipe 33, and the notch part 58 does not need to be provided.

  Returning to FIGS. 1 and 2, the watering plate 61 is held on the upper surface of the pressing member 19 at a position for receiving the sewage flowing down from the tip of the nozzle 42 of the four discharge portions 33 b of the branch pipe 33. The watering plate 61 has a main body 61a whose upper surface is square and a support 61b that is inclined downward from the central part of the four sides of the main body 61a. The water spray plate 61 disperses the sewage falling from the nozzle 42 by colliding with the upper surface of the main body 61a. The dispersed sewage falls into the filling part 21.

  The microorganism holding carrier 20 filled in the filling portion 21 of the apparatus main body 15 described above is composed of a sponge lump made of resin such as polyurethane, for example. The microorganism-retaining carrier 20 is preferably porous and water-retaining in order to increase the microorganism-retaining density and to ensure a hydraulic retention time. As the microorganisms retained on the microorganism-retaining carrier 20, for example, heterotrophic bacteria that aerobically oxidize dissolved substances, ammonia, sulfur-based odors (hydrogen sulfide, methyl sulfide, etc.), and methane aerobically. Examples include autotrophic bacteria that oxidize.

In the watering purification device 10 described above, the height of the device body 15 is, for example, about L ₅ = 1 m. However, the structure of the watering purification device is not limited to the structure of the watering purification device 10 shown in FIG. 1, but a purification device having a reaction tank provided with a plurality of layers of filling portions (see FIG. 6 of Patent Document 1) There is also a purification device (see Patent Document 2) having a structure having one watering device for one layer of filling portion. Therefore, the height of the apparatus main body 15 does not have to be limited to L ₅ = 1 m. Moreover, although the watering type | formula purification apparatus 10 of this embodiment is set as the structure which has arrange | positioned the several watering part 16 with respect to the one filling part 21, it is the structure of having the reaction tank which provided the multi-layered filling part mentioned above. The watering type | mold purification apparatus of the structure which has one watering apparatus with respect to the purification apparatus or the filling part of one layer may be sufficient.

The drain pipe 32 is a 25A steel circular pipe (outer diameter 34.0 mm, inner diameter 27.6 mm). The introduction part 33a and the discharge part 33b included in the branch pipe 33 are circular pipes corresponding to a PVC 25A circular pipe (outer diameter 32.0 mm, inner diameter 25.0 mm). The coil spring 51 included in the spiral structure 50 has a wire diameter of 2.3 mm and a spiral diameter of 19 mm. The distance _{L 6} to the pressing member 25 from the lower surface of the receiving member 31 is, for example, 30cm or less.

On the other hand, the diameter of the outflow hole 28a provided in the sewage water supply pipe 28 for supplying sewage to the water spray purification device 10 is 8 mm. For example, if the diameter of the outflow hole 28a is set to 5 mm or less, the amount of sewage supplied to the sprinkler 16 can be suppressed, but the outflow hole 28a may be clogged with filth contained in the sewage. In addition, when the diameter of the outflow hole is set to 10 mm or more, there is no possibility that the outflow hole 28a is clogged by the filth contained in the sewage, but the amount of sewage supplied to the water sprinkling part 16 increases, so It is supplied excessively, and it becomes impossible to uniformly supply sewage from the sprinkling part 16 to the filling part. Therefore, the diameter of the outflow hole 28a is set to 8 mm. The distance L ₇ from the lowest point to the bottom surface of the receiving member 31 of the sewage water supply pipe 28 is set to, for example, about 10 cm.

  The flow rate of sewage supplied from the sewage water supply pipe 28 to the sprinkler 16 is set as follows.

The removal BOD amount per sponge volume of the microorganism holding carrier 20 is F (unit: kg / m ³ · day), the waste water flow rate is G (unit: m ³ / day), and the removal BOD concentration in the waste water is H (unit: kg / m ³ ), the volume I (unit: m ³ ) of the microorganism holding carrier necessary for the purification apparatus is expressed by the following formula (1).

I = (H × G) / F (1)
Assuming that the density of the microorganism holding carrier is J (unit:%), the volume K (unit: m ³ ) necessary for introducing the microorganism holding carrier is expressed by the following equation (2).

K = I / J
Assuming that the height L (unit: m) of the filling portion filled with the microorganism holding carrier, the area M (unit: m ² ) of the filling portion is expressed by the following equation (3).

M = K / L (3)
As described above, since the width L1 and the depth L2 of the purification device are L1 = L2 = 50 cm, the flow rate N (unit: L / min) of the sewage per unit of watering unit is expressed by the following equation (4). Is required.

N = G / {M / (50 cm × 50 cm)} (4)
Here, the removal BOD amount F per sponge volume of the microorganism holding carrier is F = 0.70 kg / m ³ · day, the wastewater flow rate G is G = 600 m ³ / day, and the removal BOD concentration H in the wastewater is H = 0. 0.09 kg / m ³ , the density J of the microorganism holding carrier is J = 65%, and the height L of the filling portion 21 is L = 3.12 m. Therefore, when these values are used, the flow rate N of sewage supplied to the sprinkler 16 is approximately 3 L / min.

After setting the size of the apparatus main body 15 and the flow rate of fresh water to be supplied, the length of the coil spring 51 included in the spiral structure 50 described above was verified. As described above, when a 25A steel circular pipe is used as the drain pipe 32, the inner diameter is 27.6 mm. When the branch pipe 33 is made of PVC, the introduction part 33a and the discharge part 33b of the branch pipe 33 have an inner diameter of 25 mm. Here, when setting the distance L ₈ to the lower end portion of the introduction portion 33a of the branch pipe 33 to about 69mm from the upper end of the water discharge pipe 32, the unit time of fresh water which is sprinkled from the discharge portion 33b of the branch pipes 33 The amount of water per hit was measured.

  The amount of fresh water supplied was set to 2.7 L / min. In addition, the measurement of the amount of water sprayed per unit time is the length when the spiral structure 50 is not used for the sprinkler 16, and when the spiral structure 50 using the coil spring 51 having a length of 38 mm is used for the sprinkler 16. It performed about the case where the spiral structure 50 using the coil spring 51 of 69 mm was used for the sprinkling part 16. FIG. 5A shows the result of the watering rate in each discharge part when the spiral structure 50 is not used in the watering part 16. FIG.5 (b) shows the result of the watering rate in each discharge part at the time of using the coil spring of length 38mm for the watering part 16. FIG. FIG.5 (c) shows the result of the watering rate in each discharge part at the time of using the coil spring of length 69mm for the watering part 16. FIG. In FIG. 5A to FIG. 5C, “arm 1”, “arm 2”, “arm 3”, and “arm 4” correspond to each discharge portion 33b. Below, when the fresh water supplied is calculated equally from four discharge parts, the watering rate in each discharge part shall be 25%.

  As shown to Fig.5 (a), when not using a coil spring for the watering part 16, the watering rate in each discharge part 33b is 26, 32, 16, 26%. As a result, the watering rate in each discharge part 33b can be estimated as a range of 25% ± 9% because the maximum swing width from the watering rate of 25% when discharged uniformly is 9%.

  As shown in FIG.5 (b), when the coil spring of length 38mm is used for the water spraying part 16, the water spraying rate in each discharge part 33b is 30, 24, 22, 27%. As a result, the watering rate in each discharge part 33b can be estimated as a range of 25% ± 5% because the maximum fluctuation width from the watering rate of 25% when discharged uniformly is 5%.

As shown in FIG. 5C, when a coil spring having a length of 69 mm is used for the water sprinkling part 16, the water sprinkling rate in each discharge part 33b is 28, 24, 26, 24%. As a result, the watering rate in each discharge part 33b can be estimated as a range of 25% ± 3% because the maximum fluctuation width from the watering rate of 25% when discharged uniformly is 3%.
In addition, a water spray rate is calculated | required by the following (5) Formula.

Sprinkling rate = (amount of water per discharge unit) / amount of water supplied x 100 (5)
Based on the results of FIG. 5A to FIG. 5C, it was found that the water spray rate of fresh water sprayed from each discharge part 33b is made uniform by using a coil spring for the water spray part 16. Further, as the length of the coil spring 51 approaches the same length as the distance L6 from the upper end portion of the drain pipe 32 to the branch portion of the discharge portion 33b of the branch pipe 33, the fresh water sprayed from each discharge portion 33b. It was found that the watering rate was made uniform.

  Next, verification about the watering position (length of the discharge part 33b of the branch pipe 33) was performed. As shown in FIG. 6, the sprinkling amount distribution measuring device 80 has a cylindrical case 81 whose outer shape is a square shape in a top view, one sprinkling portion 16, and an installation table 82 on which the case 81 is placed. And a measuring rod 83 disposed at the lower part of the installation table 82. The inside of the case 81 is provided with a perforated bottom plate 84 at the lower end portion, and a large number of microorganism holding carriers 20 are filled in the upper portion thereof. A space filled with a large number of microorganism holding carriers 20 in the case 81 is referred to as a filling portion 85.

As shown in FIG. 7, the width L ₁₁ and the depth L ₁₂ of the inner peripheral surface in the top view of the case 81 are, for example, a single water sprinkling unit 16 in the top view of the apparatus main body 15 in the watering purification apparatus 10. It was set to the same size as the square area A. As an example, a case where L ₁₁ = L ₁₂ = 50 cm will be described.

  As shown in FIG. 7, the sprinkling position is verified by setting each flange portion of the measurement rod 83 arranged at the lower portion of the case 81 when the radius R from the center of the case 81 is R = 100 mm, 150 mm, and 170 mm. The amount of water stored in 83a was measured.

As shown in FIG. 8, the width L ₁₅ and the depth L ₁₆ of the measuring rod 83 are L ₁₅ = L ₁₆ = 50 cm. The measuring rod 83 has a total of 100 collar portions 83a, 10 in the width direction and 10 in the depth direction.

In addition, the fresh water was supplied to the watering part 16, and the verification test of the watering position was done. Here, the flow rate of the supplied clean water was set to 2.7 L / min. Moreover, as shown in FIG. 6, the height L ₁₇ of the filling part 85 was set to 600 mm.

  As shown in FIG. 9 (a), when R = 100 mm, the watering rate at each flange 83a is within 5%, but it was found that the watering rate at the peripheral edge was small. As shown in FIG. 9 (b), when R = 150 mm, the watering rate in each flange 83a is within 5%, but it was found that the variation in the watering rate in the central portion of the apparatus main body 15 was small. . Furthermore, as shown in FIG. 9 (c), when R = 170 mm, the watering rate with respect to the peripheral portion of the apparatus main body 15 is increased, but there is a flange 83a exceeding 5%, and the watering rate varies. Was found to be larger.

As shown in FIG. 10A and FIG. 10B, the fresh water sprayed from each discharge part 33b of the branch pipe 33 of the sprinkling part 16 is the water sprayed from the other discharge part 33b in the filling part 85. Is duplicated. For example, when water is sprayed at a position near the center of the case 81 and when water is sprayed at a position away from the center of the case 81, water sprayed from each discharge portion 33b is sprayed from the other discharge portions 33b. The height that overlaps with the water (water retention height) is different. For example water retention height L ₁₈ when the length of the discharge portion 33b is short, it is higher than the water retention height L ₁₉ for performing watering with length longer branch pipe 33 of the discharge portion 33b. For example, when watering is performed at a position close to the center of the case 81, the influence of the flow rate of fresh water sprayed from the other discharge part 33b is large, and the flow of each brim part 83a depends on the water retention performance of the microorganism holding carrier 20. It is considered that fluctuations have been eased and the flow rate of fresh water flowing down has been equalized. On the other hand, when watering is performed at a position away from the center of the case 81, the watering distribution is broadened, but the influence of the flow rate of fresh water sprayed from the other discharge part 33b is reduced, and the microorganism holding carrier 20 It is difficult to equalize the flow rate of fresh water flowing down due to water retention performance.

Therefore, when watering is performed at a position away from the center of the case 81, it is considered that fluctuations in the flow rate of fresh water discharged from each discharge portion 33b are not alleviated and the watering rate varies. Therefore, when the width L ₁₁ and the depth L ₁₂ of the case 81 are set to L ₁₁ = L ₁₂ = 50 cm, it has been found that the watering position is preferably set within a range of less than 170 mm from the center of the case 81. .

  Finally, with the sewage flowing into the sewage treatment plant, the amount of water sprayed per unit time of each discharge portion 33b of the branch pipe 33 when the spiral structure 50 is used for the sprinkling portion 16, and the spiral structure 50 is the sprinkling portion 16 The amount of water sprayed per unit time of each discharge part 33b of the branch pipe 33 when not used for the measurement was measured. The amount of water spray was measured by storing the sewage sprayed from each discharge part 33b of the branch pipe 33 in a measuring cylinder for 20 seconds.

  The amount of sewage supplied was set to 1.74 L / min. As shown in FIG. 11, when the spiral structure 50 is not used for the water spraying part 16, the water spraying rate in each discharge part 33 b is 24, 45, 13, 18%, and the water spraying when the water is evenly discharged. Since the maximum runout from a rate of 25% is 20%, it can be estimated as a range of 25 ± 20%.

  On the other hand, when the spiral structure 50 is used for the water sprinkling part 16, the water sprinkling rate in each discharge part 33b is 19, 27, 26, 28%, and the maximum fluctuation from the water sprinkling rate of 25% when discharged uniformly. Since the width is 6%, it can be estimated as a range of 25 ± 6%. That is, it was found that by using the spiral structure 50 for the water spraying part 16, the water spray rate of the sewage discharged from each discharge part 33b of the branch pipe 33 is made uniform.

  Thus, in the sprinkling type purification apparatus 10 of this embodiment, even if it is a case where the flow volume of sewage is small by providing the spiral structure 50 in the inside of the introduction part 33a of the drain pipe 32 and the branch pipe 33, the apparatus Sewage can be uniformly supplied to the microorganism holding carrier 20 filled in the main body 15. As a result, the function of decomposing microorganisms held by the microorganism holding carrier 20 filled in the apparatus main body 15 can be used effectively, and sewage can be purified aerobically. Moreover, by arranging and using the water sprinkling part 16 in a matrix shape (lattice shape), it is possible to secure a layout according to the shape of the top view of the apparatus main body 15 and to make the watering load uniform, in other words, to have redundancy. A special effect can be obtained. That is, the sprinkling part 16 of this embodiment can acquire the special effect that it becomes possible to lay out according to the magnitude | size and shape of an installation place.

  Furthermore, since the spiral structure 50 is made detachable, consideration is given to cleaning and inspection of the spiral structure 50, so that an exceptional effect that the maintainability is good can be obtained.

  In the present embodiment, the spiral structure 50 includes the coil spring 51, the upper plate 52 provided at the upper end portion of the coil spring 51, and the lower plate 53 provided at the lower end portion of the coil spring 51. The spiral structure 50 which does not have may be used.

  In the present embodiment, the details of the inside of the branch pipe 33 are omitted, but a threshold wall for improving the dispersibility of sewage is provided on the inner wall surface of the branch part between the introduction part 33a and the discharge part 33b. It is also possible. By providing a threshold wall, it is possible to prevent the return flow of sewage flowing into each discharge part 33b where the sewage circulates along the inner wall of the pipe of the introduction part 33a of the branch pipe 33 and is uniformly dispersed. It is possible to have the effect of preventing the uniform dispersion.

DESCRIPTION OF SYMBOLS 10 ... Sprinkling type purification apparatus, 15 ... Apparatus main body, 16 ... Sprinkling part, 20 ... Microbe holding carrier, 21 ... Filling part, 50 ... Spiral structure, 61 ... Sprinkling plate

Claims (10)

In a sprinkler for sprinkling sewage supplied from a water supply pipe from above an apparatus main body filled with a microorganism holding carrier that holds a large number of microorganisms,
A receiving member for receiving the sewage falling from an outflow pipe provided in the water supply pipe;
The introduction having an introduction portion that is arranged in the center in the top view of the apparatus main body and extends downward from the receiving member, and a plurality of discharge portions that extend radially from a lower end portion of the introduction portion, A drain pipe for discharging the sewage flowing from the section from each of the plurality of discharge pipes;
A spiral structure that is detachably provided in the drain pipe, and causes the sewage that has flowed into the drain pipe from the receiving member to flow down along the inner peripheral surface of the drain pipe;
A watering device characterized by comprising: The watering device according to claim 1,
The watering device according to claim 1, wherein the helical structure has a coil that is positioned in the vicinity of the inner peripheral surface of the drain pipe or abutted against the inner peripheral surface of the drain pipe when attached to the drain pipe. The watering device according to claim 2,
The spiral structure has a disc-shaped first plate having an opening in the center at an upper end portion of the coil. The watering device according to claim 3,
The first plate has a plurality of notches arranged at predetermined intervals in a circumferential direction of the opening. The watering device according to any one of claims 2 to 4,
The spiral structure has a disc-shaped second plate having an opening in the center at a lower end portion of the coil. The watering device according to claim 5,
The said 2nd plate has a plurality of notch parts arrange | positioned at predetermined intervals in the circumferential direction of the said opening, The watering apparatus characterized by the above-mentioned. In the watering apparatus of any one of Claim 1 to 6,
A plurality of discharge parts which the drainage pipe has is a structure having the intersection of four pipes which incline downward. In the watering apparatus of any one of Claims 1-7,
The device body has a polygonal outer shape in a top view of the device body,
The water discharge device, wherein the plurality of discharge portions are provided at positions facing each vertex of the outer shape of the device main body in a top view. In the watering apparatus of any one of Claims 1-8,
The watering device further comprising a dispersion member that collides with the sewage falling from each discharge part of the drainage pipe, disperses the sewage and supplies the sewage to the microorganism holding carrier. A watering device according to any one of claims 1 to 9,
An apparatus main body filled with a microorganism holding carrier for holding a large number of microorganisms;
A watering type purifying apparatus, comprising: a water collecting section for collecting treated water purified by the microorganism holding carrier filled in the apparatus main body.