JP2020142226A - Wastewater treatment apparatus - Google Patents

Abstract

To provide a wastewater treatment apparatus in which wastewater containing microorganisms is stored inside a panel tank, where it does not require aeration by a blower and hence can reduce not only the deterioration of panels that form a panel tank, but also water leakage from the panel tank.SOLUTION: A wastewater treatment apparatus 1 comprises: a panel tank 3 formed by combining a plurality of panels 2a, 2b-3, 2b-4 and 2c; and an oxygen permeation module 5 comprising an oxygen permeation membrane 4. Wastewater W is stored inside the panel tank 3, in which is installed an oxygen permeation module 5. Oxygen required by microorganisms to purify wastewater can be supplied to microorganisms through the oxygen permeable membrane 4.SELECTED DRAWING: Figure 3

Description

The present invention relates to a wastewater treatment device using microorganisms. More specifically, the present invention relates to a wastewater treatment apparatus that uses a gas permeable membrane and achieves both organic wastewater treatment efficiency and energy saving.

Conventionally, a wastewater treatment device that purifies wastewater by the activity of microorganisms has been used. In this type of wastewater treatment apparatus, steel frames, steel plates, and reinforced concrete are used to manufacture the skeleton of a tank for storing wastewater, and reinforced concrete is often used in particular.

In small-scale wastewater treatment equipment, a panel tank in which FRP panels are combined is used as a tank for storing wastewater. When assembling the panel tank, for example, as disclosed in Patent Document 1, adjacent panels are overlapped with each other via packing (sealing material), and adjacent panels are connected with bolts and nuts (fastening member). It is fixed. When the above panel tank is used, there is an advantage that the construction period can be shortened as compared with the case where the tank made of reinforced concrete is used.

JP-A-2017-217592

By the way, in a generally adopted wastewater treatment method such as an activated sludge method, a catalytic oxidation method, or a membrane separation activated sludge method, bubbling is required to supply oxygen to microorganisms in the wastewater. For example, in the catalytic oxidation method, as shown in FIG. 15, the blower B arranged in the tank T causes side baffle (FIG. 15 (a)), central baffle (FIG. 15 (b)), and full baffle. By performing (FIG. 15 (c)), oxygen is supplied to the microorganisms contained in the wastewater W.

When the tank T is a panel tank, the vibration generated by the blower B's exhaustion is transmitted to the panel P constituting the tank T, causing repeated fatigue in the panel P and cracking in the panel P in the long term. There is a risk of entry or damage. Further, when adjacent panels P and P are fixed by bolts and nuts as in Patent Document 1, even if packing (sealing material) is arranged between the panels P and P, vibration due to bubbling If the nut loosens at, water leakage may occur.

The present invention has been made in view of the above matters, and an object of the present invention is a wastewater treatment device in which wastewater is stored inside a panel tank, and the panel tank does not need to be blown by a blower. It is an object of the present invention to provide a wastewater treatment apparatus capable of reducing the deterioration of the panels constituting the above and the occurrence of water leakage from the panel tank.

In order to achieve the above object, the present invention includes the subjects described in the following sections.

Item 1. A panel tank composed of a combination of multiple panels and
Equipped with an oxygen permeation module including an oxygen permeation membrane
A wastewater treatment device in which wastewater is stored inside the panel tank and the oxygen permeation module is installed.

Item 2. Item 2. The wastewater treatment apparatus according to Item 1, further comprising an oxygen supply device that supplies oxygen to the oxygen permeation module.

Item 3. Item 2. The wastewater treatment apparatus according to Item 1 or 2, wherein the material of the panel is FRP or stainless steel.

Item 4. With a surfacing prevention part
The mass of the oxygen permeation module is smaller than the mass of water having the same volume as the oxygen permeation module.
The wastewater treatment device according to any one of Items 1 to 3, wherein the floating prevention unit stops the oxygen permeation module in a fixed position without floating.

Item 5. Further provided with a shielding portion provided inside the panel tank,
Item 2. The wastewater treatment device according to any one of Items 1 to 4, wherein the shielding portion is arranged in the vicinity of the wastewater inflow portion of the panel tank and blocks the flow of wastewater flowing in from the wastewater inflow portion.

Item 6. Item 1 to 2, which includes a ceiling frame arranged along the upper surface of the ceiling panel of the panel tank, and the ceiling frame can be removed from the panel tank or slid along the upper surface of the ceiling panel. The wastewater treatment apparatus according to any one of 5.

Item 7. Item 2. The wastewater treatment apparatus according to any one of Items 1 to 6, further comprising a moving mechanism capable of moving the oxygen permeation module in the lateral direction.

According to the wastewater treatment apparatus of the present invention, the oxygen permeation module including the oxygen permeation membrane is provided inside the panel tank, so that the oxygen required for the microorganisms to purify the wastewater is transferred to the microorganisms through the oxygen permeation membrane. Can be supplied to. Therefore, since it is not necessary to perform "blowing by a blower" that causes vibration, it is possible to reduce deterioration of the panels constituting the panel tank and leakage of water from the panel tank.

It is a top view of the wastewater treatment apparatus which concerns on embodiment of this invention. It is a side view which shows the state which looked at the wastewater treatment apparatus in the A direction of FIG. It is a side view which shows the state which looked at the wastewater treatment apparatus in the B direction of FIG. It is a side view which shows the state which looked at the wastewater treatment apparatus in the C direction of FIG. It is a side view corresponding to FIG. 3, and shows a submersible weir and an overflow weir. (A) is a schematic view showing a wastewater treatment apparatus provided with a ceiling frame, and (b) is a schematic view showing a state in which a ceiling frame is slid. It is a schematic diagram which shows the wastewater treatment apparatus provided with the moving mechanism. It is a vertical sectional view of an oxygen permeable membrane. It is a side view which shows the part of the oxygen permeation module enlarged. It is a front view of the oxygen permeation module. It is an enlarged view which shows the levitation prevention part provided in the wastewater treatment apparatus, (a) is a plan view, (b) is a front view, (c) is a side view. It is a side view which shows the modification of the oxygen permeation module. It is a figure which shows the oxygen permeable membrane included in the oxygen permeable module shown in FIG. 12, (a) is a front view, (b) is a side view when the oxygen permeable membrane is seen from the arrow direction A of (a). (C) is a side view when the oxygen permeable membrane 4 is viewed from the arrow direction B of (a). It is a side view which shows the spacer provided with the oxygen permeation module in an enlarged manner. It is a schematic diagram which shows the state which the blower is arranged in the tank in order to blow the wastewater in a tank, (a) shows the state when the side blow is performed, and (b) is the center blow. Shows the state when is performed, and (c) shows the state when full-scale wastewater is performed.

Hereinafter, the wastewater treatment apparatus according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the wastewater treatment device 1 according to the embodiment of the present invention. FIG. 2 is a side view showing a state in which the wastewater treatment device 1 is viewed in the A direction of FIG. FIG. 3 is a side view showing a state in which the wastewater treatment device 1 is viewed in the B direction of FIG. FIG. 4 is a side view showing a state in which the wastewater treatment device 1 is viewed in the C direction of FIG. FIG. 5 is a side view corresponding to FIG. 3, and shows the flow (arrow) of the wastewater W in the submersible weir 8 and the overflow weir 9 and the tank 3 which will be described later.

(Wastewater treatment device 1)
The wastewater treatment device 1 of the present embodiment can purify the wastewater W (FIGS. 3 to 5) by the activity of microorganisms. As shown in FIGS. 1 to 5, the wastewater treatment apparatus 1 includes a panel tank 3 formed by combining a plurality of panels 2 and an oxygen permeation module 5 (FIGS. 3 to 5) including an oxygen permeation membrane 4. The wastewater W containing microorganisms is stored inside the panel tank 3, and the oxygen permeation module 5 is installed.

(Panel tank 3)
In the panel tank 3, the bottom panel 2a, the side panel 2b, and the ceiling panel 2c are connected by bolts and nuts, and packing is provided between the panels 2 and 2 adjacent to each other in the vertical or horizontal direction. Is sandwiched. Various plastics or various metals can be used as the material of the panels 2a, 2b, 2c, but it is preferable to use FRP (Fiber Rainforced Plastics) or stainless steel from the viewpoint of strength and corrosion resistance.

In the illustrated example, one bottom panel 2a, four side panels 2b, and one ceiling panel 2c are used to assemble the panel tank 3 (panels in FIGS. 3 to 5). In order to illustrate the internal structure of the tank 3, one side panel 2b is removed). The four side panels 2b extend upward from the outer edge of the bottom panel 2a to form an annular peripheral wall. Wastewater W (FIGS. 3 to 5) containing microorganisms is stored in the space inside the peripheral wall (that is, inside the panel tank 3), and the oxygen permeation module 5 is installed. The ceiling panel 2c is attached to the upper end of the peripheral wall (the upper end of the four side panels 2b). The ceiling panel 2c is provided with a removable lid 6. By removing the lid 6, the oxygen permeation module 5 can be installed in the tank 3 and the oxygen permeation module 5 in the tank 3 can be removed.

The number of panels 2a, 2b, 2c constituting the panel tank 3 is not limited to the above number (1, 4, 1, 1). The number of panels 2a, 2b, and 2c can be appropriately adjusted in order to add or modify the panel tank 3 or to adjust the volume of the panel tank 3. When assembling the panel tank 3 inside the building, it is preferable that one short side of the panels 2a, 2b, 2c is 1.8 m or less. In this way, since the general entrance / exit size of the building is 1.8 m × 0.9 m, the panels 2a, 2b, and 2c can be carried in or out from the entrance / exit.

A wastewater inflow port 7a through which the wastewater W flows is formed in the ceiling panel 2c of the panel tank 3. On the upper side of one side panel 2b provided in the panel tank 3, a wastewater outlet 7b for flowing out the wastewater W is formed (in FIG. 5, oxygen provided in the module 5 to illustrate the wastewater outlet 7b). Not all of the permeable membranes 4 are shown, only three oxygen permeable membranes 4 are shown). The wastewater W is continuously or intermittently supplied from the wastewater inflow port 7a toward the wastewater outflow port 7b.

Hereinafter, among the four side wall panels 2b provided in the panel tank 3, the "side wall panel 2b provided with the wastewater outlet 7b" will be referred to as "side wall panel 2b-1". Further, the "side wall panel 2b arranged on the opposite side of the side wall panel 2b-1" is referred to as "side wall panel 2b-2". Further, the "side wall panel 2b connecting the side edges on one side of the side wall panels 2b-1 and 2b-2" is referred to as "side wall panel 2b-3". Further, "a side wall panel 2b that is arranged on the opposite side of the side wall panel 2b-3 and connects the side edges on the other side of the side wall panels 2b-1, 2b-2" is referred to as "side wall panel 2b-4".

As shown in FIGS. 3 to 5, a shielding portion 8 is provided inside the panel tank 3 to block the flow of the wastewater W flowing in from the wastewater inflow port 7a. In the illustrated example, a submerged weir is provided in the vicinity of the wastewater inflow port 7a as the shielding portion 8. The submerged weir 8 (shielding portion) is a plate material whose both side edges are supported by the side wall panels 2b-3 and 2b-4 (FIGS. 3 and 5). As shown by the arrows in FIGS. 4 and 5, the wastewater W flowing in from the wastewater inflow port 7a flows downward in the space between the submersible weir 8 (shielding portion) and the side wall panel 2b-2, and the submerged weir 8 It passes between the lower end 8a and the bottom panel 2a. After that, the wastewater W flows toward the side wall panel 2b-1 side (wastewater outlet 7b side) while gradually rising. The structure of the submersible weir 8 (shielding portion) is not limited to the above structure. For example, the submersible weir 8 may be supported by a member extending downward from the ceiling panel 2c, or may be supported by a member extending upward from the bottom panel 2a. Alternatively, the submersible weir 8 may be supported by a member extending in the horizontal direction from the side wall panel 2b.

Further, as shown in FIGS. 4 and 5, an overflow weir 9 is provided in the vicinity of the wastewater outlet 7b inside the panel tank 3. As shown in FIG. 4, the overflow weir 9 has an L-shape in a side view, and one end 9a of the L-shape is supported by the side edge panel 2b-1. By providing the overflow weir 9, of the wastewater W flowing to the side wall panel 2b-1 side (wastewater outlet 7b side), the wastewater W overflowing the other end 9b of the L-shape of the overflow weir 9 However, it flows out from the wastewater outlet 7b. The structure of the overflow weir 9 is not limited to the above structure, and has various structures capable of evenly overflowing the wastewater W and allowing the overflowed wastewater W to flow out from the wastewater outlet 7b. obtain.

Further, as shown in FIG. 6, the wastewater treatment device 1 may be provided with a ceiling frame 10. The ceiling frame 10 is for fixing the panel 2c forming the ceiling of the tank 3, and is arranged along the upper surface of the ceiling panel 2c. When the ceiling frame 10 is used, for example, one end 100 and the other end 101 of the ceiling frame 10 are fixed to the upper ends of the side panel 2b by bolts and nuts, respectively. Then, by releasing the fixing of one end 100 and the other end 101 with the bolts and nuts, a part or all of the ceiling frame 10 can be slid or removed from the panel tank 3 (FIG. 6 (FIG. 6). b) shows a state in which the ceiling frame 10 slides along the upper surface of the ceiling panel 2c). As described above, the lid 6 of the ceiling panel 2c can be opened (the state shown by the alternate long and short dash line in FIG. 2), and the ceiling frame 10 does not interfere with the installation and removal of the oxygen permeation module 5. .. Therefore, the oxygen permeation module 5 can be smoothly installed and taken out.

In the example shown in FIG. 6, the ceiling frame 10a extending in the vertical direction and the ceiling frame 10b extending in the horizontal direction are joined at the intersection position K, so that the plurality of frames 10 are integrated. The plurality of integrated frames 10 are arranged along the upper surface of the ceiling panel 2c, and the ends 100 and 101 of each frame 10 are fixed to the upper end of the side panel 2b by bolts and nuts. According to the example shown in FIG. 6, by integrating the plurality of frames 10 and releasing the fixing of each frame 10 by the bolts and nuts, as shown in FIG. 6B, the plurality of frames 1 Can be slid all at once or removed at the same time.

Further, as shown in FIG. 7, a moving mechanism 11 capable of moving the oxygen permeation module 5 in the lateral direction may be provided in the wastewater treatment device 1. In the example shown in FIG. 7, the moving mechanism 11 is composed of a pair of rails 12 installed on the bottom surface of the panel tank 3 (upper surface of the bottom panel 2a) and casters 13 attached to the bottom of the oxygen permeation module 5. .. The rail 12 extends from one of the two opposing sides of the panel tank 3 toward the other, and the caster 13 is rollable on the rail 12. According to the above-mentioned moving mechanism 11, the oxygen permeation module 5 can be moved in the lateral direction (the extending direction of the rail 12) by rolling the casters 13, so that the oxygen permeation module 5 can be easily installed and taken out. .. When installing and taking out the oxygen permeation module 5, as shown in FIG. 7, the entrance / exit 14 of the oxygen permeation module 5 is secured by removing one or more side panels 2b provided in the panel tank 3. Module. Further, the moving mechanism 11 for moving the oxygen permeation module 5 in the lateral direction may be configured by a known means other than the rail 12 and the caster 13.

(Oxygen permeable membrane 4)
The oxygen permeation module 5 is capable of holding a plurality of oxygen permeation membranes 4 in parallel at regular intervals. In the present invention, the oxygen permeable membrane 4 is a structure that supplies oxygen to the wastewater W. The shape of the oxygen permeable membrane 4 is not particularly limited as long as it can be unitized, and the shape thereof includes, for example, a flat plate shape and a hollow thread shape, and is a spiral shape in which the flat plate oxygen permeable membrane 4 is wound. You may. Hereinafter, a specific form of the oxygen permeable membrane 4 held in the oxygen permeable module 5 will be described.

FIG. 8 is a vertical cross-sectional view showing the oxygen permeable membrane 4. The oxygen permeable membrane 4 has a flat bag shape including a breathable member 20 inside, and the upper end portion 21b is opened on the water surface Wa.

Specifically, the oxygen permeable membrane 4 includes the above-mentioned breathable member 20 and the air-permeable sheet 21, and the breathable member 20 is arranged in a bag made of the air-permeable sheet 21. In the bag, for example, two air permeable sheets 21 are superposed and the three end portions of the air permeable sheets 21 are bonded to each other, and the breathable member 20 is inside the bag from the opening of the upper end portion 21b. The outer circumference of the breathable member 20 is covered with the air permeable sheet 21 by being inserted into.

The breathable member 20 is, for example, a hollow plate-shaped member, and is formed of any of resin, metal, paper, natural fiber, and the like. In this case, the cavity of the breathable member 20 constitutes a gas flow path, and gas passage holes are formed on the front and back surfaces of the breathable member 20. The breathable member 20 may be composed of, for example, a plurality of non-hollow resin spheres. In this case, the gap between the spheres becomes a gas flow path.

The air permeable sheet 21 has gas permeability that allows gas to permeate from the inside (breathable member 20 side) to the outside (wastewater W side) in a state where the outermost layer is immersed in the wastewater W so as to come into contact with the wastewater W. And has waterproof property that does not allow wastewater W to permeate from the outside (wastewater W side) to the inside (breathable member 20 side).

The air-permeable sheet 21 is, for example, a laminate of a porous base material, a gas-permeable non-porous layer, and a microorganism support layer.

The porous base material is, for example, a microporous membrane formed of a thermoplastic resin (the microporous membrane is a membrane provided with a large number of fine through holes). Materials for the porous substrate include polyolefins, polystyrene, polysulfone, polyethersulfone, polyarylsulfone, polymethylpentene, polytetrafluoroethylene, and fluororesins including polyvinylidene fluoride, polybutadiene, and poly (dimethylsiloxane). It may contain a silicone-based polymer, a polymer material selected from copolymers of these materials, and the like.

The gas-permeable non-porous layer is a layer having pores having a pore diameter smaller than that of the porous substrate, or a layer in which the diameter of the pores cannot be detected and gas can be permeated. The gas permeable non-porous layer can be formed from a thermoplastic resin or a thermosetting resin.

The above-mentioned microbial support layer is a layer that retains microorganisms on its surface or inside, has a space in which microorganisms can grow, and allows organic substances in water to pass through. Examples of the material of the microbial support layer include a porous sheet such as a mesh, a woven fabric, a non-woven fabric, a foam, or a microporous membrane. The material of the porous sheet is polyolefin resin, polystyrene resin, polyester resin, polyvinyl chloride resin, acrylic resin, urethane resin, epoxy resin, polyamide resin, methyl cellulose resin, ethyl cellulose resin, polyvinyl alcohol resin, vinyl acetate resin, phenol resin, Fluororesin and polyvinyl butyral resin, polyimide, polyphenylene sulfide, para- and meta-aramid, polyarylate, carbon fiber, glass fiber, aluminum fiber, steel fiber, ceramic and the like can be mentioned. In consideration of microbial adhesion and processability, polyolefin resins, polyester resins, polyamide resins, acrylic resins, polyurethane resins and carbon fibers are preferable.

When the above-mentioned microbial support layer, porous substrate, and gas permeable non-porous layer are used, the air permeable sheet 21 is laminated in the order of porous substrate → gas permeable non-porous layer → microbial support layer. The gas-permeable non-porous layer, the porous substrate, and the microbial support layer are laminated in this order, and the microbial support layer constitutes the outermost layer in contact with the waste water W. The gas-permeable non-porous layer may also serve as a microbial support layer.

According to the wastewater treatment apparatus 1 of the present embodiment, oxygen in the space on the water surface Wa (FIG. 8) is introduced into the oxygen permeable membrane 4 through the opening of the upper end portion 21b (arrows in FIG. 8 are: It shows the flow of oxygen). Alternatively, an oxygen supply device is provided in the wastewater treatment device 1, and the oxygen supplied from the oxygen supply device and the oxygen in the space on the water surface Wa are separated from the oxygen permeable membrane 4 through the opening of the upper end portion 21b. It may be introduced internally. Alternatively, only oxygen supplied from the oxygen supply device may be introduced into the oxygen permeable membrane 4 through the opening of the upper end portion 21b.

The oxygen introduced into the oxygen permeable membrane 4 flows along the cavity of the breathable member 20, or flows between the spheres constituting the breathable member 20, and flows through the air permeable sheet 21 in the wastewater W. Is released to. As a result, the microorganism V in the wastewater W is activated, and the microorganism V grows on the oxidation permeable membrane 4 (FIG. 8).

The wastewater W is supplied into the panel tank 3 from the wastewater inflow port 7a (FIGS. 1 to 5). The wastewater W supplied into the tank 3 flows downward in the space between the diving weir 8 and the side wall panel 2b-2 as described above, and then gradually rises to the side wall panel 2b-1 side (wastewater). It goes toward the outlet 7b side). Then, the wastewater W toward the side wall panel 2b-1 side (wastewater outlet 7b side) passes between the oxygen permeable membranes 4 and 4 installed in the oxygen permeation module 5 (FIGS. 4 and 5). At this time, the wastewater W is purified by the microorganism V (FIG. 9) that has grown on the oxygen permeable membrane 4. Then, of the purified wastewater W, the wastewater W that has overflowed the other end 9b (FIGS. 4 and 5) of the overflow weir 9 is discharged from the wastewater outlet 7b.

According to the wastewater treatment apparatus of the present embodiment described above, the oxygen permeation module 5 including the oxygen permeation membrane 4 is provided inside the panel tank 3, so that the microorganism V is required to purify the wastewater W. Oxygen can be supplied to the microorganism V via the oxygen permeable membrane 4. Therefore, as shown in FIG. 15, it is not necessary to perform the “blower by the blower B” that causes vibration, so that the panels 2a, 2b, and 2c constituting the panel tank 3 are deteriorated, and water leakage from the panel tank 3 occurs. It can be reduced.

Further, in the present embodiment, as shown in FIGS. 3 to 5, a submersible weir 8 is installed on the wastewater inflow port 7a side and an overflow weir 9 is installed on the wastewater outflow port 7b side inside the panel tank 3. As a result, the wastewater W is dispersed and flows between the oxygen permeable membranes 4 and 4. Therefore, the contact efficiency between the microorganism V growing on the oxygen permeable membrane 4 and the wastewater W can be improved, so that the treatment performance of the wastewater treatment device 1 can be improved.

When the specific gravity of the members constituting the oxygen permeation module 5 is small and the mass of the oxygen permeation module 5 is smaller than the mass of water having the same volume as the oxygen permeation module 5, oxygen permeation is caused by buoyancy. Module 5 may surface. Therefore, in the above case, a hook 80 (FIGS. 3 to 5) as a floating prevention portion is provided in the wastewater treatment device 1, and the oxygen permeation module 5 is locked to the hook 80. Hereinafter, the structure of the oxygen permeation module 5 that can be locked to the hook 80 will be described.

(Oxygen permeation module 5)
As shown in FIGS. 9 and 10, in addition to the plurality of oxygen permeable membranes 4 described above, the oxygen permeation module 5 includes a first connecting member 74, a second connecting member 75, and a third connecting member 76. I have.

The first connecting member 74 and the second connecting member 75 extend in the horizontal first direction, and the first connecting member 74 and the second connecting member 75 are in a vertical second direction orthogonal to the first direction. They are arranged at intervals. Then, the first connecting member 74 is passed through the first through hole 77 formed in the oxygen permeable membrane 4, and the second connecting member 75 is passed through the second through hole 78 formed in the oxygen permeable membrane 4. The oxygen permeable membrane 4 is held by the first connecting member 74 and the second connecting member 75.

More specifically, as shown in FIG. 10, a first through hole 77 is formed at the center of the width at the upper end of each oxygen permeable membrane 4, and the first through hole 77 is formed at the center of the width or at both ends of the width at the lower end of each oxygen permeable membrane 4. Two through holes 78 are formed. Then, the first connecting member 74 is passed through the first through hole 77 of each oxygen permeable membrane 4, and the second connecting member 75 is passed through each of the three second through holes 78 of each oxygen permeable membrane 4. A plurality of oxygen permeable membranes 4 are held by the first connecting member 74 and the three second connecting members 75 and are arranged in the first direction. Further, in the two oxygen permeable membranes 4 and 4 adjacent to each other, the tubular spacer 72 (FIG. 9) is ringed around the first and second connecting members 74 and 75 extending between them, so that the two oxygen permeable films The spacing between the permeable membranes 4 and 4 is maintained at the width of the spacer 72.

The third connecting member 76 extends in a horizontal third direction orthogonal to the first and second directions. The third connecting member 76 connects a plurality of second connecting members 75 arranged at intervals in the third direction (in the example of FIG. 10, the three second connecting members 75 are the third connecting members. It is connected via 76).

The third connecting member 76 is composed of a flat plate called a flat bar. A plurality of through holes 79 are formed in the third connecting member 76 at intervals in the third direction, and a plurality of second connecting members are connected by passing the second connecting member 75 through each of the through holes 79. The members 75 are connected via the third connecting member 76 (in the example of FIG. 10, the second connecting member 75 is passed through each of the three through holes 79, so that the three second connecting members 75 are connected. It is connected via a third connecting member 76). The through hole 79 is formed at a position corresponding to the second through hole 78 (a position on the same straight line extending in the first direction), and the second connecting member 75 is formed with the second through hole 78. It is supposed to pass through the through hole 79.

When the oxygen permeation module 5 is assembled, the third connecting member 76 has an extending portion 76a (FIG. 10) extending outward (outside in the third direction) from the oxygen permeation membrane 4. The extending portion 76a is provided as a portion to be locked to the hook 80 (floating prevention portion).

The number of the first connecting members 74 is preferably 1 or more and 10 or less. If the first connecting member 74 is not provided, it becomes difficult to stably hold the oxygen permeable membrane 4. When the number of the first connecting members 74 is larger than 10, it becomes difficult to process the oxygen permeation module 5.

The number of the second connecting members 75 is preferably 2 or more and 20 or less. When the number of the second connecting members 75 is 1, it becomes difficult to stably hold the oxygen permeable membrane 4. When the number of the second connecting members 75 is larger than 20, it becomes difficult to process the oxygen permeation module 5.

Further, the outer diameter of the first connecting member 74 and the second connecting member 75 is preferably 5 mm or more and 100 mm or less. When the outer diameters of the connecting members 74 and 75 are smaller than 5 mm, the strength of the oxygen permeation module 5 cannot be sufficiently secured. When the outer diameters of the connecting members 74 and 75 are larger than 100 mm, the effective area of the air permeable sheet 21 (FIG. 8) of the oxygen permeable membrane 4 cannot be sufficiently secured.

Further, it is preferable that the material of the spacer 72 is stainless steel, titanium, coated steel, or plastic such as FRP. By doing so, it is possible to prevent the spacer 72 from being damaged due to corrosion.

Further, from the relationship with the outer diameters of the connecting members 74 and 75, the inner diameter of the spacer 72 is preferably 5 mm or more and 100 mm or less.

When the moving mechanism 11 shown in FIG. 7 is provided in the wastewater treatment device, the casters 13 are attached to, for example, the third connecting member 76 and / or the spacer 72 ringed on the second connecting member 75. ..

(Floating prevention part)
The hook 80 as the levitation prevention portion is fixed to the bottom panel 2a (FIGS. 2 to 6) of the panel tank 3 via the height adjusting means 81 (FIGS. 10 and 11). The height adjusting means 81 is composed of a bolt 82, a support plate 83, and a channel steel 84. The bolt 82 extends in the vertical direction, and the lower end portion of the bolt 82 is fastened to the bottom panel 2a (FIG. 10). The support plate 83 extends in the third direction, and both ends thereof are fastened to the bolts 82. The channel steel 84 extends in the first direction, and has a flat plate-shaped main body 84a and a pair of side plates 84b, 84b protruding from both side edges of the main body 84a. The tips (lower ends) of the side plates 84b and 84b are joined to the upper surface of the support plate 83, and the lower end of the hook 80 is fastened to the center of the main body 84a. The hook 80 has a curved portion 80a, and has a shape that extends upward from the channel steel 84, then curves, and extends downward. According to the above configuration, the height of the hook 80 can be changed by changing the length of the bolt 82 extending from the bottom panel 2a.

According to the above configuration, one or both of the following operations A and B are performed to make the extending portion 76a (FIG. 10) of the third connecting member 76 the curved portion 80a of the hook 80 (FIG. 11 (c)). The oxygen permeation module 5 can be prevented from floating by locking the module 5.

Operation A: After the oxygen permeation module 5 is put into the panel tank 3 in which the wastewater W is stored, the oxygen permeation module 5 in the wastewater W is floated.
Operation B: After the oxygen permeation module 5 is put into the panel tank 3, the position of the oxygen permeation module 5 is shifted in the horizontal direction.

For example, with the wastewater W stored inside the panel tank 3, the charging step of charging the oxygen permeation module 5 into the panel tank 3 is carried out by an operation from the outside of the panel tank 3.

In the above charging step, first, the oxygen permeation module 5 is pressed downward to submerge the oxygen permeation module 5 in the wastewater W. At this time, the position of the oxygen permeation module 5 is adjusted so that the extending portion 76a of the third connecting member 76, which is a flat plate, is located directly below the curved portion 80a of the hook 80. After that, by releasing the pressing against the oxygen permeation module 5, the oxygen permeation module 5 is levitated and the extending portion 76a of the third connecting member 76 is inserted into the curved portion 80a of the hook 80. .. As a result, the hook 80 is locked to the extending portion 76a of the third connecting member 76 (flat plate), and the oxygen permeation module 5 is fixed.

Further, in order to prevent the hook 80 from coming off from the third connecting member 76, it is preferable to form a protrusion 87 (FIG. 10) at the end of the third connecting member 76. The protrusion 87 projects in a direction orthogonal to the stretching direction (third direction) of the third connecting member 76, which is a flat plate, and in the illustrated example, the protrusion 87 projects upward. The forming position of the protrusion 87 is not limited to the end of the third connecting member 76, and may be any position of the third connecting member 76 capable of preventing the hook 80 from coming off.

In addition, in order to surely prevent the oxygen permeation module 5 from floating, as shown in FIGS. 9 and 10, a plurality of hooks 80 are arranged at intervals in the first direction, and the hooks 80 are composed of the plurality of hooks 80. It is preferable to arrange a plurality of rows in the third direction (in the example shown in FIGS. 9 and 10, three hooks 80 are installed at intervals in the first direction, and the two hooks 80 are composed of the three hooks 80. The columns are spaced apart in the third direction). Then, in the above case, it is preferable to fasten the plurality of hooks 80 arranged in the first direction to the same channel steel 84. By doing so, since the plurality of hooks 80 arranged in the first direction can be positioned at the same height, the oxygen permeation module 5 can be fixed stably and surely. The number of hooks 80 arranged in the first direction and the number of sets of hooks 80 arranged in the third direction are not limited to 3 and 2 described above, and may be any plurality.

The material of the hook 80 is preferably stainless steel, titanium, coated steel, or plastic such as FRP. By doing so, it is possible to prevent the hook 80 from being damaged due to corrosion.

The number of hooks 80 is preferably 4 or more and 20 or less. When the number of hooks 80 is smaller than 4, it becomes difficult to stably fix the oxygen permeation module 5. When the number of hooks 80 is larger than 20, it becomes difficult to process the wastewater treatment apparatus 1.

Further, the length of the extending portion 76a of the third connecting member 76 for locking the hook 80 is preferably 3 mm or more and 600 mm or less. If the length of the extending portion 76a is smaller than 3 mm, the oxygen permeation module 5 may not be stably fixed. When the length of the extending portion 76a is larger than 600 mm, the distance between the panel tank 3 and the oxygen permeation module 5 is widened, and wastewater W that is anaerobically decomposed is generated in the panel tank 3.

Further, the third connecting member 76 for locking the hook 80 does not necessarily have to be a flat plate (flat bar), and the third connecting member 76 may be a bar member. In this case, in order to prevent the hook 80 from coming off from the bar (third connecting member 76), the bar (third connecting member 76) has a protrusion protruding in a direction orthogonal to the extending direction thereof. Is formed.

When the third connecting member 76 is made into a flat plate, the thickness of the third connecting member 76 is preferably 2 mm or more and 100 mm or less. If the thickness is smaller than 2 mm, the strength of the third connecting member 76 cannot be sufficiently secured. When the thickness is smaller than 100 mm, the number of oxygen permeable membranes 4 that can be held in the oxygen permeable module 5 decreases.

The oxygen permeation module 5 may be provided with a pillar member (not shown) for supporting the first connecting member 74. The pillar member extends in the vertical direction, and the lower end is fastened to the second connecting member 75 and the upper end is fastened to the first connecting member 74. The pillar member is, for example, a flat plate, an L angle, a C channel, a round bar, a square bar, a hollow circular tube, or a hollow square tube. By using the pillar member, the strength of the oxygen permeation module 5 is increased. be able to.

Further, it is not always necessary to fix the hook 80 to the bottom panel 2a of the panel tank 3. The hook 80 may be fixed to the side panel 2b of the panel tank 3. Alternatively, the hook 80 may be provided in the oxygen permeation module 5, and a locking portion for locking the hook 80 may be provided in the panel tank 3.

Further, when the oxygen permeation module 5 is put into the panel tank 3, the wastewater W does not have to be stored inside the panel tank 3, and the oxygen permeation module 5 does not float on water. Good. In the above case, for example, by operating from the outside of the panel tank 3, the oxygen permeation module 5 is put into the inside of the panel tank 3 and the oxygen permeation module 5 is landed on the bottom panel 2a. Then, by operating the panel tank 3 from the outside, the position of the oxygen permeation module 5 is shifted in the horizontal direction, so that the flat plate or the rod member of the oxygen permeation module 5 is fitted into the curved portion 80a of the hook 80. As a result, the flat plate or the bar is locked to the hook 80, and the oxygen permeation module 5 is fixed to the panel tank 3. If the oxygen permeation module 5 floats on water, the hook 80 can be locked to a flat plate or a bar by utilizing the floating of the oxygen permeation module 5, so that it is not necessary to shift the position of the oxygen permeation module 5. .. On the other hand, if the oxygen permeation module 5 does not float on water, it is not necessary to press the oxygen permeation module 5 downward when the oxygen permeation module 5 is put into the tank 3, and the oxygen permeation module 5 does not need to be pressed downward. Can be submerged in the wastewater W.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the invention.

For example, the oxygen permeation module provided in the wastewater treatment apparatus of the present invention is not limited to that shown in the above embodiment. Hereinafter, a modified example of the oxygen permeation module will be described.

(Oxygen Permeation Module 90)
FIG. 12 is a front view showing the oxygen permeation module 90 of the modified example. 13A and 13B are views showing an oxygen permeable membrane 4 included in the oxygen permeable module 90 shown in FIG. 12, in which FIG. 13A is a front view, and FIG. 13B is a view of the oxygen permeable membrane 4 from the arrow direction a of FIG. It is a side view of the time, and (C) is a side view when the oxygen permeable membrane 4 is viewed from the arrow direction b of (A). FIG. 14 is an enlarged side view showing the spacers 96 and 97 included in the oxygen permeation module 90.

As shown in FIGS. 12 and 13, the oxygen permeation module 90 includes a plurality of oxygen permeation membranes 4, a pair of opposing members 91A and 91B, a first connecting member 92, and a second connecting member 93 (FIG. 13). It has.

The pair of facing members 91A and 91B have a rectangular ring shape, and are arranged so as to face each other at intervals in the horizontal direction. Hereinafter, the "horizontal direction in which the opposing members 91A and 91B face each other" will be referred to as a "first direction".

The first connecting member 92 and the second connecting member 93 extend in the first direction, and the opposing members 91A and 91B are connected via the first connecting member 92 and the second connecting member 93.

The first connecting member 92 and the second connecting member 93 are arranged at intervals in a horizontal second direction orthogonal to the first direction. Then, the first connecting member 92 is passed through the first through hole 94 formed in the oxygen permeable membrane 4, and the second connecting member 93 is passed through the second through hole 95 formed in the oxygen permeable membrane 4. The oxygen permeable membrane 4 is held by the first connecting member 92 and the second connecting member 93.

More specifically, as shown in FIG. 13, in each oxygen permeable membrane 4, the first through hole 94 is formed at the upper end portion, the central portion, and the lower end portion on one side of the width, and the upper end portion / center on the other side of the width. A second through hole 95 is formed in the portion and the lower end portion. In each oxygen permeable membrane 4, a tubular spacer 96 is attached to the first through hole 94, a tubular spacer 97 is attached to the second through hole 95, and the first connecting member 92 is inside the spacer 96. The second connecting member 93 is passed through the inside of the spacer 97. As a result, each oxygen permeable membrane 4 is held by the connecting members 92 and 93 via spacers 96 and 97, respectively. Then, as shown in FIG. 14, in the two adjacent oxygen permeable membranes 4, the end faces of the spacer 96 attached to the first through hole 94 abut each other, and the end faces of the spacer 97 attached to the second through hole 95 meet each other. The distance P between the two adjacent oxygen permeable membranes 4 is maintained at a predetermined value (in FIG. 14, the structure at the position of the first through hole 94 and the position of the second through hole 95). Since the structure of the above is the same structure, the above two positions are shown together).

The number of the first connecting members 92 is preferably 1 or more and 10 or less. If the first connecting member 92 is not provided, it becomes difficult to stably hold the oxygen permeable membrane 4. When the number of the first connecting members 92 is larger than 10, it becomes difficult to process the oxygen permeation module 90.

The number of the second connecting members 93 is preferably 2 or more and 20 or less. When the number of the second connecting members 93 is 1, it becomes difficult to stably hold the oxygen permeable membrane 4. When the number of the second connecting members 93 is larger than 20, it becomes difficult to process the wastewater treatment device 1.

In the oxygen permeation module 90, the total number of the first connecting member 92 and the second connecting member 93 is preferably 4 or more and 30 or less. If the total number of the above is less than 4, the oxygen permeable membrane 4 may not be stably held by the first connecting member 92 and the second connecting member 93. If the total number of the above is more than 30, the first connecting member 92 and the second connecting member 93 may be difficult to process.

Further, the outer diameter of the first connecting member 92 and the second connecting member 93 is preferably 5 mm or more and 100 mm or less. If the outer diameter of the first connecting member 92 or the second connecting member 93 is smaller than 5 mm, the strength of the first connecting member 92 or the second connecting member 93 may not be sufficiently secured. If the outer diameter of the first connecting member 92 or the second connecting member 93 is larger than 100 mm, the effective area of the air permeable sheet 21 of the oxygen permeable membrane 4 may not be sufficiently secured.

Further, from the relationship with the outer diameter of the connecting members 92 and 93, the inner diameter of the spacers 96 and 97 is preferably 5 mm or more and 100 mm or less.

Further, it is preferable that the spacers 96 and 97 are made of stainless steel, titanium, coated steel, or plastic such as polyvinyl chloride resin, polyethylene resin, polypropylene resin, polystyrene resin, polyester resin, and FRP. By doing so, it is possible to prevent the spacer 96 from being damaged due to corrosion.

Further, the first connecting member 92 and the second connecting member 93 may be arranged at intervals in a vertical second direction orthogonal to the horizontal first direction. In this case, for example, the spacer 96 is attached to the first through hole 94 formed at the upper end of each oxygen permeable membrane 4, and the spacer 97 is attached to the second through hole 95 formed at the lower end of each oxygen permeable membrane 4. It is attached. Then, the first connecting member 92 is passed through the spacer 96 of each oxygen permeable membrane 4, and the second connecting member 93 is passed inside the spacer 97 of each oxygen permeable membrane 4, so that each oxygen permeable membrane 4 is passed. , Are held by the connecting members 92 and 93 via spacers 96 and 97, respectively. In the two adjacent oxygen permeable membranes 4, the end faces of the spacer 96 attached to the first through hole 94 abut each other, and the end faces of the spacer 97 attached to the second through hole 95 abut each other. The distance between two adjacent oxygen permeable membranes 4 is maintained at a predetermined value.

Further, it is not always necessary that a plurality of oxygen permeable membranes 4 are held by the oxygen permeable module 90, and one oxygen permeable membrane 4 may be held by the oxygen permeable module 90. In this case, the spacers 96 and 97 are omitted.

When the moving mechanism 11 shown in FIG. 7 is provided in the wastewater treatment device, the caster 13 is attached to, for example, any of the facing member 91A, the facing member 91B, and the spacers 96 and 97.

1 Wastewater treatment device 2a Bottom panel 2b Side panel 2c Ceiling panel 3 Panel tank 4 Oxygen permeable membrane 5 Oxygen permeable module 8 Submersible weir (shield)
10a, 10b Ceiling frame 11 Moving mechanism

Claims (7)

A panel tank composed of a combination of multiple panels and
Equipped with an oxygen permeation module including an oxygen permeation membrane
A wastewater treatment device in which wastewater is stored inside the panel tank and the oxygen permeation module is installed. The wastewater treatment apparatus according to claim 1, further comprising an oxygen supply device that supplies oxygen to the oxygen permeation module. The wastewater treatment apparatus according to claim 1 or 2, wherein the material of the panel is FRP or stainless steel. With a surfacing prevention part
The mass of the oxygen permeation module is smaller than the mass of water having the same volume as the oxygen permeation module.
The wastewater treatment device according to any one of claims 1 to 3, wherein the floating prevention unit stops the oxygen permeation module in a fixed position without floating. Further provided with a shielding portion provided inside the panel tank,
The wastewater treatment apparatus according to any one of claims 1 to 4, wherein the shielding portion is arranged in the vicinity of the wastewater inflow portion of the panel tank and blocks the flow of wastewater flowing in from the wastewater inflow portion. 1. The ceiling frame includes a ceiling frame arranged along the upper surface of the ceiling panel of the panel tank, and the ceiling frame can be removed from the panel tank or slid along the upper surface of the ceiling panel. The wastewater treatment apparatus according to any one of 5 to 5. The wastewater treatment apparatus according to any one of claims 1 to 6, further comprising a moving mechanism capable of moving the oxygen permeation module in the lateral direction.