JP2012050955A - Transfer pipe and device for treating waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for reducing a space for arrangement of a configuration for performing transfer of a liquid and confirmation of its transfer amount.SOLUTION: A transfer pipe 900 including the pipe 910, a flange 914 fixed to the pipe, a screw part 912 formed on an outer peripheral surface of the pipe 910, and a reference part 938 indicating a reference of the height of a liquid level relative to a liquid surface of the liquid is used.

Description

  The present invention relates to a transfer pipe and a waste water treatment apparatus.

  Conventionally, in a wastewater treatment apparatus, various members have been used to transfer a liquid. For example, a socket having a flange portion and a screw portion is used to fix a liquid transfer pipe to a wall. In addition, a measuring rod such as a triangular rod is used for the user to confirm the amount of liquid transferred per unit time (hereinafter simply referred to as “transfer amount”).

JP 2008-43888 A

  By the way, in the wastewater treatment apparatus, when the liquid is transferred and the amount of the transfer is confirmed, the space occupied by the configuration for the wastewater treatment apparatus is often large. For example, when a measuring rod is provided in the middle of a pipe using a joint member, the space for the joint member and the measuring rod is large, so it is difficult to check the transfer amount in a narrow place.

  The main advantage of the present invention is to provide a technique capable of reducing the space required for the arrangement of the structure for transferring the liquid and confirming the transfer amount.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
A transfer pipe used for transferring liquid in a wastewater treatment apparatus,
A pipe part that forms a flow path through which liquid flows;
A flange fixed to the pipe portion;
A screw part formed on an outer peripheral surface of the pipe part, wherein the transfer pipe and the other pipes are sandwiched by another member different from the transfer pipe by the flange and a nut screwed into the screw part. A screw portion for fixing the members to each other;
A reference portion indicating a reference of the height of the liquid level relative to the liquid level;
With transfer pipe.

  According to this configuration, the transfer pipe and the other member can be easily fixed to each other by sandwiching the other member between the flange and the nut screwed into the screw portion. As a result, the space required for fixing the transfer pipe can be reduced. Furthermore, liquid can be easily transferred through the transfer pipe. Here, the transfer pipe includes a reference portion that indicates a reference of the liquid level with respect to the liquid level. As a result, the liquid transfer amount can be easily confirmed by comparing the liquid level and the reference portion without separately providing a measuring device such as a measuring bowl. As a result, it is possible to reduce the space required for the arrangement of the liquid transfer and the confirmation of the transfer amount.

[Application Example 2]
The transfer pipe according to Application Example 1,
A weir formed in the pipe portion, the weir having an outflow portion which is an open portion where the liquid flows from one side of the weir to the other side;
Transfer pipe.

  According to this configuration, even when the appropriate transfer amount is small (for example, about 1 L / min), the change in the height of the water surface with respect to the change in the transfer amount can be increased. It is possible to easily check whether or not is appropriate.

[Application Example 3]
The transfer pipe according to application example 2,
The weir is a plate-like portion that intersects the flow path.
Transfer pipe.

  According to this configuration, it is possible to avoid an excessive space required for installing the weir in the transfer pipe, so that it is possible to reduce the space required for arranging the configuration for transferring the liquid and confirming the transfer amount.

[Application Example 4]
The transfer pipe according to any one of Application Examples 1 to 3,
The reference part includes a three-dimensional part indicating a reference of the height of the liquid level of the liquid,
Transfer pipe.

  According to this configuration, it is possible to greatly reduce the possibility that the reference is lost due to the attachment of the microbial film or the like to the reference portion.

[Application Example 5]
The transfer pipe according to any one of Application Example 1 to Application Example 4,
The reference part is provided at an end of the pipe part,
At least a part of the upper part of the pipe part above the reference part ends at the front of the reference part so as not to cover the upper part of the reference part.
Transfer pipe.

  According to this configuration, since the reference portion provided at the end of the transfer pipe can be observed from above the transfer pipe, the transfer pipe can be laid horizontally while maintaining a state where the amount of liquid transfer can be confirmed. It is possible to place the transfer pipe in a narrow place where it is difficult to observe from the outside. As a result, it is possible to reduce the space required for the arrangement of the configuration for transferring the liquid and confirming the transfer amount.

[Application Example 6]
The transfer pipe according to any one of Application Examples 1 to 5,
The reference part includes a first reference part and a second reference part formed at a position lower than the first reference part.
Transfer pipe.

  According to this configuration, since the range of the liquid level from the first reference part to the second reference part can be used as an appropriate range, it is possible to easily determine whether or not the liquid level is appropriate. . And the space required for arrangement | positioning of the structure which enables such judgment can be reduced.

[Application Example 7]
The transfer pipe according to Application Example 6 when dependent on Application Example 2,
The dam includes a first step portion including an upper end surface and a second step portion having an upper surface located at a position lower than the upper end surface while blocking a part below the flow path.
The first reference portion includes the upper end surface of the first step portion,
The second reference part includes the upper surface of the second step part,
Transfer pipe.

  According to this configuration, the first weir and the second reference portion are formed by the weir blocking a part below the flow path and having the first step portion and the second step portion. Accordingly, it is possible to avoid an excessive increase in the size of the weirs forming the first and second reference portions, so that it is possible to reduce the space required for the arrangement of the configuration for transferring the liquid and confirming the transfer amount. .

[Application Example 8]
Wastewater treatment equipment,
A plurality of treatment tanks including a first treatment tank surrounded by a wall including a first wall and a second treatment tank surrounded by a wall including a second wall;
The transfer pipe according to any one of Application Example 1 to Application Example 7, wherein water treated in the first treatment tank is transferred from the first treatment tank to the second treatment tank,
A nut screwed into the threaded portion of the transfer pipe;
With
The transfer pipe, the first wall, and the second wall are mutually connected by sandwiching a plurality of members including the first wall and the second wall by the nut and the flange of the transfer pipe. Fixed,
Wastewater treatment equipment.

  According to this configuration, the water treated in the first treatment tank can be appropriately transferred from the first treatment tank to the second treatment tank by the transfer pipe, and the amount of water transferred can be easily confirmed. be able to. Furthermore, since the transfer pipe, the first wall, and the second wall are fixed to each other by the nut and the flange of the transfer pipe, the transfer pipe is appropriately fixed to the first processing tank and the second processing tank. be able to. By these, the space required for arrangement | positioning of the structure for performing the transfer of water from a 1st process tank to a 2nd process tank, and confirmation of a transfer amount can be reduced.

  In addition, this invention can be implement | achieved with various forms, for example, can implement | achieve with forms, such as a transfer pipe, the waste water treatment equipment provided with a transfer pipe, the adjustment method of the transfer amount using a transfer pipe, etc. it can.

It is explanatory drawing which shows the processing flow of the waste water treatment equipment 800 as one Example of this invention. It is explanatory drawing which represents typically the internal structure of the waste water treatment equipment. It is the schematic which looked at the waste water treatment apparatus 800 toward the downward direction. It is the schematic which looked at the downstream part of the waste water treatment equipment 800 horizontally. It is the perspective view which looked at the aerobic filter bed tank 830 from diagonally upward. FIG. 6 is a perspective view of a transfer pipe 900 and a nut 990. It is explanatory drawing of the transfer pipe 900. FIG. FIG. 6 is an exploded perspective view showing assembly of a transfer pipe 900. It is sectional drawing which shows the vicinity of the assembled transfer pipe 900. FIG. It is a perspective view which shows another Example (transfer pipe 900A) of a transfer pipe. It is a perspective view which shows another Example (transfer pipe 900B) of a transfer pipe. It is a perspective view which shows another Example (transfer pipe 900C) of a transfer pipe. It is a perspective view which shows another Example (transfer pipe 900D) of a transfer pipe. It is a perspective view which shows another Example (transfer pipe 900E) of a transfer pipe. It is a perspective view which shows another Example (transfer pipe 900F) of a transfer pipe.

  Next, an embodiment of the present invention will be described based on the first example and a modification.

A. First embodiment:
FIG. 1 is an explanatory diagram showing a processing flow of a wastewater treatment apparatus 800 as an embodiment of the present invention. The wastewater treatment apparatus 800 of the present embodiment is an apparatus that purifies wastewater from a general household (such an apparatus is also called a “septic tank”). The wastewater treatment apparatus 800 has a plurality of water treatment tanks in order to perform purification treatment through a plurality of steps. In the embodiment of FIG. 1, the waste water treatment apparatus 800 includes an inlet 802, a precipitation separation tank 810, an anaerobic filter bed tank 820, an aerobic filter bed tank 830, a treated water tank 840, in order from the upstream (left side in FIG. 1). A disinfection tank 850 and an outlet 804 are provided. The sedimentation separation tank 810 includes a sedimentation separation unit 815 and a sludge storage unit 816. The aerobic filter bed tank 830 includes a contact aeration unit 831 and a biological filtration unit 832. Wastewater flows into the wastewater treatment apparatus 800 from the inlet 802. The waste water that has flowed into the waste water treatment apparatus 800 is sequentially treated in the sedimentation separation tank 810, the anaerobic filter bed tank 820, the aerobic filter bed tank 830, the treated water tank 840, and the disinfection tank 850, and then through the outlet 804. It is discharged to the outside of 800. Hereinafter, water flowing through each water treatment tank is referred to as “water to be treated” or simply “water”.

  FIG. 2 is an explanatory diagram schematically showing the internal configuration of the waste water treatment apparatus 800. FIG. 2 shows a schematic configuration of the waste water treatment apparatus 800 viewed from the side. FIG. 3 shows a schematic configuration of the waste water treatment apparatus 800 as viewed from above in the vertical direction, and is a schematic view of the AA cross section in FIG. 2 as viewed from above to below. 4 is a schematic view of the BB cross section in FIG. 2 viewed horizontally from the right side of FIG. In these drawings, the Z direction indicates the direction from the lower side to the upper side in the vertical direction, the X direction indicates the longitudinal direction (horizontal direction) of the waste water treatment apparatus 800, and the Y direction indicates the X direction and the Z direction. The direction (horizontal direction) orthogonal to each of the is shown.

  The sedimentation separation tank 810 is a water treatment tank that separates impurities in the waste water. Waste water (also referred to as sewage) flows into the precipitation separation tank 810 from the inlet 802. The precipitation separation tank 810 has solid-liquid separation means such as baffles 812a and 812b, and separates impurities (solid matter) in the waste water from the water to be treated. As shown in FIG. 2, a filter medium 813 is filled in a partial region outside the baffle 812a. This region corresponds to the sludge storage unit 816. The remaining area of the precipitation separation tank 810 (particularly, the area inside the baffle 812a) corresponds to the precipitation separation unit 815. Although not shown, an air lift pump is provided inside the baffle 812a. The air lift pump is driven by air from a blower (blower) (not shown), and always transfers water from the sediment separation unit 815 to the sludge storage unit 816. Thereby, the solid substance separated by the sedimentation separation unit 815 is transferred to the sludge storage unit 816. Although not shown, an air diffuser is provided below the filter medium 813 of the sludge storage unit 816. This air diffuser is connected to the above-described blower (not shown), and always supplies the air from the blower to the filter medium 813 of the sludge storage unit 816. Aerobic microorganisms adhere to the filter medium 813 and digest sludge aerobically.

  A partition plate 819 is provided on the downstream side (+ X side) of the precipitation separation tank 810. The water after the impurities are separated (removed) is transferred to the anaerobic filter bed tank 820 through an empty portion at the top of the partition plate 819.

  The anaerobic filter bed tank 820 is a water treatment tank that performs anaerobic treatment with anaerobic microorganisms. The anaerobic filter bed tank 820 has a filter medium 822 for attaching anaerobic microorganisms. The organic matter in the for-treatment water is decomposed by the anaerobic treatment. Moreover, the filter medium 822 can capture floating substances in the water to be treated. As shown in FIG. 3, a partition plate 829 is provided on the downstream side (+ X side) of the anaerobic filter bed tank 820. A downstream baffle 826 is fixed to the partition plate 829. The treated water flows from the lower part of the filter medium 822 to a region surrounded by the downstream baffle 826 and the partition plate 829.

  A transfer air lift pump 827 is provided in a region surrounded by the downstream baffle 826 and the partition plate 829. The transfer air lift pump 827 is configured to pass from the inside of the downstream baffle 826 to the upper part of the contact aeration unit 831 of the aerobic filter bed tank 830 through the upper part of the partition plate 829. The suction port 827i (FIGS. 2 and 3) of the transfer air lift pump 827 is disposed in the downstream baffle 826, and the discharge port 827o (FIG. 3) of the transfer air lift pump 827 is disposed above the contact aeration unit 831. Yes. The transfer air lift pump 827 transfers the water in the downstream baffle 826 to the upper part of the contact aeration unit 831. However, the transfer air lift pump 827 may transfer the water in the downstream baffle 826 to the upper part of the biological filtration unit 832. In general, the transfer air lift pump 827 may transfer the water after the treatment in the anaerobic filter bed tank 820 to the upper part of the aerobic filter bed tank 830. Here, the discharge port 827 o of the transfer air lift pump 827 may be located higher than the water surface of the aerobic filter bed tank 830. The transfer air lift pump 827 is driven by the air from the blower (not shown) described above.

  FIG. 5 is a perspective view of the aerobic filter bed tank 830 viewed obliquely from above (in the figure, the tank body 801 is not shown). The aerobic filter bed tank 830 is a water treatment tank that performs aerobic treatment with aerobic microorganisms. As shown in FIGS. 3 and 5, the space between the downstream side (+ X side) of the partition plate 829 and the tank body 801 is directed from the + Y side to the −Y side by the two intermediate partition plates 838 and 839. It is divided into three spaces lined up (Figs. 3-5). The three spaces correspond to the contact aeration unit 831, the biological filtration unit 832, and the treated water tank 840, respectively. The entirety of the contact aeration unit 831 and the biological filtration unit 832 corresponds to the aerobic filter bed tank 830.

  As shown in FIG. 4, the contact aeration unit 831 has a contact material 834 for attaching aerobic microorganisms. Further, the contact aeration unit 831 includes an air diffuser 835 disposed below the contact material 834. The above-described blower (not shown) is connected to the air diffuser 835. The air diffuser 835 supplies the air supplied by the blower into the contact aeration unit 831. Aerobic microorganisms use oxygen contained in the air to decompose organic matter in the water to be treated.

  The water treated by the contact aeration unit 831 is transferred to the biological filtration unit 832 through an empty portion at the top of the first middle partition plate 838 (arrow CA in FIGS. 3 to 5). As shown in FIG. 4, the biological filtration unit 832 includes a filtering material 836 for supplementing solid matter (suspended material (SS) or the like). The water flowing into the upper part of the biological filtration unit 832 passes through the filter medium 836 and moves to the lower part of the biological filtration unit 832. The contact aeration unit 831 and the biological filtration unit 832 communicate with each other at the lower part of the first middle partition plate 838, and the water that has passed through the filter medium 836 flows to the lower part of the contact aeration unit 831. As described above, when the water circulates between the contact aeration unit 831 and the biological filtration unit 832, the processing by the contact aeration unit 831 and the biological filtration unit 832 is repeated. In addition, the water treated by the biological filtration unit 832 is transferred to the treated water tank 840 through a vacant part at the lower part of the second middle partition plate 839.

  In this embodiment, a granular carrier having a specific gravity greater than 1 is employed as the filter medium 836. In order to prevent the carrier from flowing out from the biological filtration part 832, nets are arranged at the lower part and the upper part of the biological filtration part 832. In addition, the waste water treatment apparatus 800 includes a diffuser 837 (FIG. 4) disposed below the filter medium 836 for regularly backwashing the filter medium 836, and a sedimentation separation tank from the biological filter unit 832. 810 has a backwash air lift pump (not shown) for transferring water. During backwashing, the carrier is agitated by the air from the diffuser. Then, the solid matter captured by the carrier is transferred to the precipitation separation tank 810 by a backwash air lift pump.

  The treated water tank 840 is a water treatment tank that temporarily retains the water transferred from the aerobic filter bed tank 830 and settles and separates solids (for example, sludge and suspended solids) in the water. The solid matter separated in the treated water tank 840 is collected at the bottom of the treated water tank 840.

  As shown in FIG. 2, a circulating water lift pump 849 is provided in the treated water tank 840. The circulating air lift pump 849 sucks water from the bottom of the treated water tank 840 and transfers the sucked water to the precipitation separation tank 810. The solid matter collected at the bottom of the treated water tank 840 is transferred to the precipitation separation tank 810 by a circulating air lift pump 849. The circulating air lift pump 849 is driven by the air from the blower (not shown) described above. The distribution amount of air from the blower to the circulating air lift pump 849 is adjusted by a valve (not shown).

  As shown in FIGS. 3 and 4, an advection baffle 848 is fixed to the upper part of the second middle partition plate 839. A transfer pipe 900 is fixed to a portion of the second middle partition plate 839 surrounded by the advection baffle 848. As will be described later, the transfer pipe 900 is fixed in a state of passing through the second intermediate partition plate 839 and the wall of the disinfection tank 850. The water after the solid matter is separated in the treated water tank 840 is transferred to the disinfection tank 850 through the transfer pipe 900.

  The disinfection tank 850 is a water treatment tank that disinfects the water to be treated. As shown in FIGS. 4 and 5, the disinfection tank 850 is disposed on the biological filtration unit 832. The disinfection tank 850 includes a tank body 851 having a box shape with a bottom, and a medicine cylinder fixing baffle 852 arranged inside the tank body 851.

  As shown in FIG. 4, the medicine barrel fixing baffle 852 forms a horizontally extending flow path and a flow path extending downward from one end of the flow path. In the middle of the horizontally extending flow path, a holding portion 853 is formed to hold the medicine cylinder 854 filled with a disinfectant (for example, a solid chlorine agent) so as not to fall down. The medicine barrel fixed baffle 852 guides the water that has flowed into the disinfection tank 850 to the medicine tube 854 to contact the disinfectant. The medicine barrel fixing baffle 852 guides the water sterilized by contact with the disinfectant to the lower part of the disinfection tank 850 (tank body 851). The sterilized water is discharged to the outside of the waste water treatment apparatus 800 through the outlet 804.

  The waste water treatment apparatus 800 of the present embodiment has a flow rate adjustment function in order to stabilize the quality of the treated water. Specifically, the transfer air lift pump 827 (FIGS. 2 and 3) continuously transfers water from the anaerobic filter bed tank 820 to the aerobic filter bed tank 830. On the other hand, as shown in FIGS. 2, 3, and 5, a return weir 828 is provided on the upper part of the partition plate 829 (that is, the upper part of the aerobic filter bed tank 830). Of the amount of water transferred to the aerobic filter bed 830, the amount of water circulated by the circulating air lift pump 849 and the amount of water transferred to the disinfection tank 850 through the transfer pipe 900 (the same as the amount of water discharged from the waste water treatment device 800). The removed excess water returns to the anaerobic filter bed tank 820 through the return weir 828. As a result, water is continuously transferred from the anaerobic filter bed tank 820 to the aerobic filter bed tank 830 by approximately a constant amount.

  In the present embodiment, a valve (not shown) for adjusting the air flow rate is provided in the air piping from the blower (not shown) to the circulating air lift pump 849, and the above-described air diffuser and other air lift pumps are provided. (For example, an air pipe leading to the transfer air lift pump 827 and an air pipe leading to the diffuser 835) are provided with orifices (not shown). As a result, the balance of the amount of air distributed to each of the above-described air diffusers and each of the air lift pumps (for example, the circulating air lift pump 849, the transfer air lift pump 827, and the air diffuser 835) greatly deviates from an appropriate balance. The possibility is reduced. If the user adjusts the valve (not shown) so that the amount of circulating water (the amount of water per unit time) is an appropriate amount, the transfer amount (discharged water amount) by the transfer pipe 900 is set to an appropriate amount as a result. Can be done.

  It is suppressed that the fluctuation | variation of the inflow water quantity (water quantity per unit time) to the waste water treatment apparatus 800 affects the aerobic filter bed tank 830 by the fluctuation | variation of the water level of the sedimentation separation tank 810 and the anaerobic filter bed tank 820. Has been. The suction port 827i of the transfer air lift pump 827 is arranged at the height of the low water level LWL shown in FIG. Therefore, the water level of the sedimentation separation tank 810 and the anaerobic filter bed tank 820 can be lowered to this low water level LWL. Furthermore, the waste water treatment apparatus 800 is configured so that overflow does not occur even when the water level rises to a high water level HWL higher than the low water level LWL. Even when the water level fluctuates between the low water level LWL and the high water level HWL, the amount of circulating water by the circulating air lift pump 849, the amount of water transferred to the disinfection tank 850 through the transfer pipe 900, and the anaerobic filter bed tank 820 are favorable. The amount of water transferred to the air filter bed tank 830 (substantial amount of water excluding the amount returned from the return weir 828) and the amount of water per unit time are maintained at a substantially constant amount without largely fluctuating. Is done. As a result, the aerobic filter bed tank 830 can continue the stable treatment.

  The return weir 828 is a movable weir capable of changing the height of the weir. If the amount of water flowing through the transfer pipe 900 (transfer amount) is not appropriate with the amount of circulating water adjusted appropriately, the user can adjust the transfer amount by adjusting the height of the return weir 828. . Specifically, by adjusting the height of the return weir 828, the water level of the treated water tank 840, that is, the water level flowing through the transfer pipe 900 can be adjusted. And as the water level is higher, the amount of water flowing through the transfer pipe 900 per unit time (that is, the amount of discharged water) increases. In the present embodiment, the transfer pipe 900 has a three-dimensional portion (three-dimensional configuration) for confirming an appropriate water level so that the user can easily confirm the transfer amount.

  6A is a perspective view of the transfer pipe 900, and FIG. 6B is a perspective view of a nut 990 that is screwed into the transfer pipe 900. FIGS. 7A, 7B, 7C, and 7D show a plan view, a rear view, a cross-sectional view, and a front view of the transfer pipe 900, respectively. The directions (X, Y, and Z directions) shown in each figure indicate directions in a state where the transfer pipe 900 is fixed to the waste water treatment apparatus 800. In other drawings described later, the illustrated directions indicate directions in a state where the transfer pipe 900 is fixed to the waste water treatment apparatus 800.

  The transfer pipe 900 includes a hollow cylindrical pipe portion 910 that forms a flow path 911, a screw portion 912 formed on the outer peripheral surface of the pipe portion 910, a flange 914 that is fixed to the outer peripheral surface of the pipe portion 910, a pipe And a weir 930 fixed to a first end 910e1 which is one end of the portion 910. The screw portion 912 is a male screw formed so as to turn on the outer peripheral surface of the pipe portion 910. As shown in FIG. 7A, the screw portion 912 is formed in a partial area PA between the areas from one end of the pipe portion 910 to the other end. The flange 914 is fixed to a portion of the outer peripheral surface of the pipe portion 910 where the screw portion 912 is not formed. In the present embodiment, the flange 914 is closer to the first end 910e1 than the screw portion 912 is.

  As shown in FIG. 6B, the nut 990 includes a ring-shaped member 992, and a screw portion 994 is formed on the inner peripheral surface of the member 992. The screw part 994 is a female screw formed so as to turn on the inner peripheral surface of the ring-shaped member 992. The nut 990 is screwed into the screw part 912 of the pipe part 910. Thereby, various members can be sandwiched between the flange 914 and the nut 990.

  FIG. 8 is an exploded perspective view showing the assembly of the transfer pipe 900. FIG. 9 is a cross-sectional view showing the vicinity of the assembled transfer pipe 900. In the present embodiment, the transfer pipe 900 is fixed in a state where the medicine barrel fixing baffle 852 of the disinfection tank 850, the tank main body 851 of the disinfection tank 850, and the second middle partition plate 839 penetrate in this order. . Specifically, the medicine cylinder fixing baffle 852 is arranged in the tank body 851 so that the hole 851h of the tank body 851 of the disinfection tank 850 and the hole 852h of the medicine cylinder fixing baffle 852 overlap. Further, the sterilization tank 850 is disposed near the second middle partition plate 839 so that these holes overlap with the hole 839h of the second middle partition plate 839. The nut 990 is tightened to the transfer pipe 900 in a state where the transfer pipe 900 has passed through the three holes 852h, 851h, and 839h. By tightening the nut 990, the medicine barrel fixing baffle 852, the tank main body 851, and the second middle partition plate 839 are sandwiched between the flange 914 and the nut 990. Then, the transfer pipe 900, the medicine cylinder fixing baffle 852, the tank body 851 of the disinfection tank 850, and the second middle partition plate 839 are fixed to each other. Note that a hole 852i, a hole 851i, and a recess 839i are provided above the hole 852h, the hole 851h, and the hole 839h, respectively. These form an overflow opening through which water flows from the treated water tank 840 to the disinfection tank 850 when the water level of the treated water tank 840 rises excessively.

  As shown in FIGS. 8 and 9, in this embodiment, the flange 914 is disposed in the disinfection tank 850 and the nut 990 is disposed on the treated water tank 840 side. Of the both ends of the pipe portion 910, the first end 910e1 where the weir 930 is formed is disposed on the disinfection tank 850 (medicine tube fixing baffle 852) side, and the other second end 910e2 is disposed on the treated water tank 840 side. Is done. The water in the upper part of the treatment water tank 840 flows into the transfer pipe 900 from the second end 910e2, and then falls from the first end 910e1 to the disinfection tank 850 (medicine tube fixing baffle 852).

  As shown in FIGS. 6A, 7 and 9, a weir 930 is formed at the first end 910e1. The weir 930 is a plate-like portion that intersects with the pipe portion 910 (flow path 911), and blocks a part of the lower portion of the flow path 911. The weir 930 has a notch 933 extending from the upper end surface 936 (also referred to as the first surface 936) of the weir 930 to the bottom of the flow path 911 (inner wall of the pipe portion 910). As shown in FIG. 7D, the shape of the notch 933 is a substantially rectangular shape extending in the vertical direction (Z direction). The water that flows into the pipe portion 910 flows out from the notch 933.

  6 (A), 7 (C), and 7 (D), the weir 930 includes a first step portion 931 having an upper end surface 936 (hereinafter, also referred to as “first surface 936”); And a second step portion 934 having an upper surface 937 (hereinafter also referred to as “second surface 937”) located at a position lower than the upper end surface 936. The second step portion 934 is formed on the downstream side of the first step portion 931. The weir 930 has a stepped shape that is thicker than the thickness at a low position (thickness in the direction in which the flow path 911 extends (here, the Y direction)). The surface on the upstream side of the weir 930 is a flat surface, and the surface on the downstream side of the weir 930 forms a stepped shape in which a portion lower than the second surface 937 protrudes outside the weir 930 (side away from the transfer pipe 900). is doing. The notch 933 starts from the first surface 936 and reaches a position lower than the second surface 937. Hereinafter, the entirety of the first surface 936 and the second surface 937 is also referred to as a reference portion 938.

  FIG. 5 shows an enlarged view of how water flows from the transfer pipe 900 to the disinfection tank 850 through the weir 930. As shown in the drawing, a first surface 936 and a second surface 937 are disposed in the vicinity of the water flowing through the notch 933. As a result, the user can easily compare the surface of the water flowing through the notch 933 with those surfaces 936, 937. In this embodiment, when the amount of water flowing through the notch 933 per unit time is within an appropriate range, the water level flowing through the notch 933 is within the range from the first surface 936 to the second surface 937. As described above, the heights of the surfaces 936 and 937 are preset. Therefore, if the water level is between those surfaces 936, 937, the user can confirm that the transfer amount is appropriate. When the water surface is lower than the second surface 937 or when the water surface is higher than the first surface 936, the user may adjust the transfer amount by adjusting the return weir 828. At this time, the user may adjust the return weir 828 so that the water surface falls between the surfaces 936 and 937.

  In the present embodiment, since the second surface 937 is disposed on the downstream side of the weir 930, the water level is higher than that of the first surface 936 even when the actual water level is higher than the second surface 937. If it is low, the second surface 937 is not submerged. As a result, even when the actual water level is higher than the second surface 937, the user can easily compare the appropriate range of the water level with the actual water level.

  As described above, in this embodiment, since the transfer pipe 900 (FIG. 6) has the threaded portion 912 and the flange 914, another member (here, a medicine barrel) is provided between the flange 914 and the nut 990. The transfer pipe 900 and other members can be easily fixed to each other by sandwiching the fixed baffle 852 (FIG. 9), the tank body 851, and the second middle partition plate 839. As a result, the space required for fixing the transfer pipe 900 can be reduced. Furthermore, the liquid can be easily transferred through the transfer pipe 900. Further, the transfer pipe 900 has a reference portion 938 (a first surface 936 and a second surface 937) that indicates a reference of the height of the water level flowing through the flow path 911. As a result, the user can easily check the amount of water flowing through the transfer pipe 900 per unit time without providing a measuring device such as a measuring rod. As a result, it is possible to reduce the space required for the arrangement of the structure for transferring water and checking the transfer amount. And as shown in FIG. 5, the transfer pipe 900 can be provided in a narrow place.

  Further, as shown in FIG. 6, in this embodiment, the transfer pipe 900 has a weir 930 formed in the pipe portion 910. The weir 930 has a notch 933 that is an open portion where water flows from one side of the weir 930 to the other side. Therefore, even when the appropriate transfer amount is small (for example, about 1 L / min), the change in the height of the water surface with respect to the change in the transfer amount can be increased, so that the user has an appropriate transfer amount. It can be easily confirmed whether or not.

  As shown in FIG. 6, in the present embodiment, the reference portion 938 is a three-dimensional portion (first surface 936 and second surface 937) that indicates the reference of the water level. As a result, it is possible to greatly reduce the possibility that the reference will be lost due to adhesion of a microbial film or the like to the reference portion 938.

  As shown in FIG. 7C, the reference portion 938 (first surface 936, second surface 937) is provided at the end portion (first end 910e1) of the pipe portion 910. The portion PU above the reference portion 938 of the end portion 910e1 ends in front of the reference portion 938 so as not to cover the upper portion of the reference portion 938 (first surface 936, second surface 937). . That is, the reference portion 938 is formed at a position protruding in the direction away from the pipe portion 910 along the horizontal direction compared to the portion PU above the reference portion 938 of the end portion 910e1 of the pipe portion 910 (this book In the embodiment, the reference portion 938 is formed at a position protruding in the extending direction of the pipe portion 910 (here, the Y direction). As a result, the user can easily observe the reference portion 938 by observing the transfer pipe 900 from above. For example, even when the waste water treatment device 800 is buried deep in the ground and the distance from the manhole opening to the transfer pipe 900 is long, the user can easily check the reference portion 938 and the water surface. Yes (Figure 5). Thus, since the transfer pipe 900 can be arranged in a narrow place where it is difficult to observe from the side, the space required for the arrangement of the structure for performing the transfer of water and the confirmation of the transfer amount is reduced. Can be reduced.

  Further, as shown in FIGS. 6 and 7C, the weir 930 is a plate-like portion that intersects with the flow path 911, so that it is possible to avoid an excessive space for installing the weir 930.

  As shown in FIGS. 6A and 7C, the reference portion 938 includes a first surface 936 and a second surface 937 formed at a position lower than the first surface 936. . As a result, since the range from the first surface 936 to the second surface 937 can be used as an appropriate range, the user can confirm that the water level is within the appropriate range, so that the transfer amount is within the appropriate range. It can be easily determined.

  In addition, as shown in FIGS. 6A and 7C, the dam 930 dams a part of the channel 911 below. That is, the upper end surface 936 of the weir 930 is at a position lower than the upper end 916 of the flow path 911. As a result, the upper end surface 936 of the weir 930 can be used as a reference for the water level. Furthermore, the weir 930 includes a first step portion 931 having an upper end surface 936 and a second step portion 934 having an upper surface 937 at a position lower than the upper end surface 936. As a result, the upper surface 937 of the second step portion 934 can be used as a reference for the water level. Thus, the first surface 936 and the second surface 937 can be formed simply by forming the weir 930 in a stepped shape. Therefore, the size of the weir 930 having the reference portion 938 (the two surfaces 936 and 937 having different heights) can be avoided from becoming excessively large.

  Further, as shown in FIGS. 8 and 9, the transfer pipe 900, the second middle partition plate 839 that is the wall of the treated water tank 840, and the tank body 851 that is the wall of the disinfection tank 850 are the second middle partition plate. 839 and the tank main body 851 are fixed to each other by being sandwiched between the flange 914 and the nut 990. As a result, the transfer pipe 900 can easily transfer water from the treated water tank 840 to the disinfection tank 850, and the amount of water transfer can be easily confirmed. In addition, the transfer pipe 900, the disinfection tank 850, and the treated water tank 840, more specifically, the transfer pipe 900, the second intermediate partition plate 839, the tank body 851 of the disinfection tank 850, and the medicine barrel fixing baffle 852 are provided. Can be properly fixed to each other.

B. Variations:
In addition, elements other than the elements claimed in the independent claims among the constituent elements in the above embodiments are additional elements and can be omitted as appropriate. The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

Modification 1:
In each of the above-described embodiments, as the three-dimensional portion (reference portion) indicating the reference of the water level, any three-dimensional shape that allows the user to specify the reference of the water level by observation can be employed. For example, the three-dimensional portion may have a three-dimensional shape including at least one of a surface and a side indicating a reference for the height of the water level. In this way, if a three-dimensional shape indicating the standard of the water level is adopted, the possibility that the standard will not be known due to adhesion of a microbial film or the like is greatly reduced compared to the case where a colored line indicating the standard of the water level is adopted. it can. However, the reference part may not be a three-dimensional part. For example, the reference portion may be a mark drawn on a surface (which may be a flat surface or a curved surface).

  FIG. 10 is a perspective view showing another embodiment of the transfer pipe (transfer pipe 900A). The only difference from the transfer pipe 900 shown in FIG. 6 is that a reference plate 934A is provided instead of the second step portion 934. The other configuration is the same as the configuration of the transfer pipe 900 of FIG. The reference plate 934A has the same second surface 937 as the second step portion 934 of FIG. The thickness of the dam 930A above the reference plate 934A is the same as the thickness of the dam 930A below the reference plate 934A.

  FIG. 11 is a perspective view showing another embodiment of the transfer pipe (transfer pipe 900B). The only difference from the transfer pipe 900 shown in FIG. 6 is that an inclined surface 934B is provided instead of the second step portion 934. The other configuration is the same as the configuration of the transfer pipe 900 of FIG. The inclined surface 934B is inclined obliquely downward from the upper end surface 936 of the weir 930B so that the lower the position, the thicker the weir 930B is. The lower end of the inclined surface 934B forms a side 937B that intersects the end surface 919 of the pipe portion 910. The side 937B is formed at the same height as the second surface 937 in FIG. If the water level is between the side 937B and the upper end surface 936, the user can determine that the transfer amount is appropriate. That is, the user may confirm that the water level intersects the inclined surface 934B. In this embodiment, the entire upper end surface 936 and side 937B correspond to the reference portion 938B.

  FIG. 12 is a perspective view showing another embodiment of the transfer pipe (transfer pipe 900C). The only difference from the transfer pipe 900 shown in FIG. 6 is that the second step portion 934 is omitted and a second wall 934C is provided instead. In this embodiment, the thickness of the weir 930C is constant regardless of the height. And the 2nd wall 934C is arrange | positioned in the downstream of the weir 930C. The shape of the second wall 934C is the same as the shape in which the triangular prism is laid sideways, and the higher the position, the thinner the thickness. The highest portion of the second wall 934C forms a side 937C. The side 937C is formed at the same height as the second surface 937 in FIG. The user can determine that the transfer amount is appropriate if the water level is between the side 937C and the upper end surface 936. In this embodiment, the entire upper end surface 936 and side 937C correspond to the reference portion 938C.

  FIG. 13 is a perspective view showing another embodiment of the transfer pipe (transfer pipe 900D). The only difference from the transfer pipe 900 shown in FIG. 6 is that a weir 930D, a V-shaped channel 939D, and two lines 936D and 937D are provided instead of the weir 930. The weir 930D is provided at the first end 910e1 of the pipe portion 910 in the same manner as the weir 930 in FIG. However, the notch 933D is V-shaped. A V-shaped channel 939D is formed so as to extend the inner surface of the V-shaped notch 933D to the downstream side (+ Y side). Two horizontal lines 936D and 937D are marked on the inner surface of the V-shaped channel 939D. The first line 936D is marked at the same height as the first surface 936 of FIG. The second line 937D is marked at the same height as the second surface 937 in FIG. The user can observe the water level and these lines 936D and 937D from above. Further, the user can determine that the transfer amount is appropriate if the level of the water flowing through the V-shaped channel 939D is between the first line 936D and the second line 937D. In this embodiment, the entirety of the first line 936D and the second line 937D corresponds to the reference portion 938D. Thus, the reference portion may be a mark drawn on the surface instead of a three-dimensional portion. Further, the entire pipe portion 910 and the V-shaped flow path 939D correspond to the pipe portion.

  FIG. 14 is a perspective view showing another embodiment of the transfer pipe (transfer pipe 900E). The difference from the transfer pipe 900 shown in FIG. 6 is that the weir 930 is omitted, and the first end 910e1 of the pipe portion 910 has a shape that is obliquely cut from the upper end obliquely downward. The only difference is that two lines 936E and 937E are marked on the inner surface of the portion 910. Specifically, at the first end 910e1, the lower the position, the greater the degree of protrusion in the + Y direction. In addition, two horizontal lines 936E and 937E are marked on the inner surface of the first end 910e1 of the channel 911. The first line 936E is marked at the same height as the first surface 936 in FIG. The second line 937E is marked at the same height as the second surface 937 in FIG. The user can observe the water level and these lines 936E and 937E from above. Further, the user can determine that the transfer amount is appropriate if the water level flowing out from the first end 910e1 of the flow path 911 is between the first line 936E and the second line 937E. In this embodiment, the entirety of the first line 936E and the second line 937E corresponds to the reference portion 938E. Thus, the reference portion may be a mark drawn on the surface instead of a three-dimensional portion. Further, the weir may be omitted as in this embodiment.

  FIG. 15 is a perspective view showing another embodiment of the transfer pipe (transfer pipe 900F). The only difference from the transfer pipe 900 shown in FIG. 6 is that the second step portion 934 is omitted and a line 937F is provided instead. In this embodiment, the thickness of the weir 930F is constant regardless of the height. A horizontal line 937F is marked on the downstream side (+ Y side) of the weir 930F. This line 937F is marked at the same height as the second surface 937 in FIG. The user can observe the water level, the upper end surface 936, and the line 937F by observing from the upper side toward the diagonally downward direction facing the -Y side. Further, the user can determine that the transfer amount is appropriate if the water level is between the line 937F and the upper end surface 936. In this embodiment, the entire upper end surface 936 and line 937F correspond to the reference portion 938F. Thus, the reference portion may include both a three-dimensional portion (for example, the upper end surface 936) and a portion that is not a three-dimensional portion (for example, a mark drawn on a surface such as the line 937F).

  The configuration of the reference unit is not limited to the configuration of each of the embodiments described above, and various other configurations can be employed. For example, some or all of the reference portions may be arranged upstream of the weir. One or both of the first reference portion and the second reference portion may be formed at a position away from the weir. In addition, it is preferable that a reference | standard part contains the solid part which shows the reference | standard of a water level. Moreover, the reference | standard part may be comprised only with such a solid part.

  In addition, if the structure which provides the 1st step part 931 and the 2nd step part 934 in the weir 930 as shown in FIG. 6 is employ | adopted, the shape of the shaping | molding die utilized for shaping | molding of the transfer pipe 900 using resin will be complicated. Can be avoided. Furthermore, the transfer pipe 900 can be manufactured by integral molding. Thus, the structure which provides a 1st step part and a 2nd step part in a weir is preferable from a viewpoint of performing manufacture easily.

  In any case, it is preferable that the first reference portion and the second reference portion are arranged so that at least a part thereof does not overlap with each other when viewed from above. And it is preferable that the reference | standard part is formed in the position which can be in contact with the water surface of the water which flows through the outflow part of a pipe part or a weir. If it carries out like this, the user can confirm the difference of the height between a water surface and a reference | standard part easily. The total number of reference parts is not limited to 2, and may be 3 or more. Moreover, the reference part may be one. In this case, the user may determine that the transfer amount is appropriate when the actual water level is close to the reference water level indicated by one reference unit. The reference portion may indicate various standards for the water level. For example, the reference portion may indicate an appropriate upper limit or lower limit of the water level, or may indicate the most preferable water level. In any case, it is preferable that the outflow part of the weir is open over a height range including each reference part. If it carries out like this, a transfer amount can be easily confirmed by comparing the water level which flows through an outflow part, and a reference | standard part.

Modification 2:
In each of the above embodiments, the configuration of the transfer pipe is not limited to the configurations shown in FIG. 6 and FIGS. 10 to 15, and other various configurations can be employed. For example, a weir may be formed at the upstream end of the transfer pipe. Further, the flange 914 may be disposed on the upstream side of the screw portion 912. Moreover, the outflow part provided in the weir is not limited to the notch 933 as shown in FIG. 6, but may be a hole provided in the weir. In any case, it is preferable that a part of the flow path formed by the transfer pipe is blocked by a weir and water is transferred from one side (upstream side) to the other side (downstream side) of the weir through the outflow part. In this way, even if the appropriate transfer amount is small (for example, about 1 L / min), the change in the height of the water surface with respect to the change in the transfer amount can be increased. It can be easily confirmed whether or not. However, the weir may be omitted. Moreover, the cross-sectional shape of the flow path of the transfer pipe is not limited to a circle, and may be an arbitrary shape (for example, a rectangle). Further, the weir is not limited to the plate-like portion, and may be a member having any other shape.

  Further, at least one end of both ends of the transfer pipe may have an end shape similar to the end of a joint member (for example, a socket) that receives another pipe. In the transfer pipe 900 of FIG. 7C, the second end 910e2 has the same end shape as the joint member. However, the shape of the end may not be such a shape.

Modification 3:
In each of the above-described embodiments, a part of the upper portion of the pipe end portion (for example, the portion PU in FIG. 7C) is a reference portion (for example, the reference portion 938 in FIG. 7C). It may protrude to the upper side of and may cover the reference portion. Also in this case, the user may observe the reference portion and the water surface from above (or obliquely above) using a portion of the end of the transfer pipe that does not protrude. Moreover, the reference | standard part may be formed inside the edge part of the transfer pipe. In this case, the reference portion may be configured so that the reference portion and the water surface can be observed by looking into the inside of the transfer pipe from obliquely above.

Modification 4:
In each of the above embodiments, in order to align the vertical direction of the transfer pipe with the correct direction, a fitting portion for fitting a jig may be provided on the transfer pipe. For example, in the transfer pipe 900 shown in FIGS. 7A and 7C, recesses 917 and 918 are formed at the second end 910 e 2 of the pipe portion 910. When assembling the transfer pipe 900 as shown in FIG. 8, the vertical direction of the transfer pipe 900 can be adjusted to the correct direction by fitting a bar-shaped jig extending in the vertical direction into the recesses 917 and 918. . In addition, the shape of such a fitting part is not limited to the concave part, but may be any other shape such as a convex part or a hole. Moreover, you may abbreviate | omit such a fitting part.

Modification 5:
The transfer pipes 900, 900 </ b> A, 900 </ b> B, and 900 </ b> C of the above embodiments are not limited to the waste water treatment apparatus 800 illustrated in FIGS. 1 to 4, and can be applied to any other waste water treatment apparatus. For example, the aerobic treatment tank is not limited to a treatment tank having a contact aeration unit, but may be any other aerobic treatment tank (for example, a carrier flow tank in which a carrier to which microorganisms adhere or a film treatment tank using a membrane is used. ). In addition, the treatment tank upstream of the aerobic treatment tank is not limited to the anaerobic filter bed tank and the precipitation separation tank, and may be any other treatment tank (for example, a contaminant removal tank). Further, the processing flow is not limited to the flow shown in FIG. 1 and may be any other flow. For example, a processing flow that does not have a flow rate adjustment function may be employed. In addition, a part of the raw water is transferred from the first treatment tank (for example, the contaminant removal tank) into which the raw water flows into the second treatment tank (for example, the carrier fluidization tank), and the water treated in the second treatment tank is You may employ | adopt the processing flow including the process of returning to a 1st processing tank again.

  In either case, a transfer pipe may be employed in the water transfer channel to the disinfection tank. If the amount transferred to the disinfection tank can be confirmed, it can be confirmed whether or not the amount of discharged water is appropriate, so that the state of the waste water treatment apparatus can be easily confirmed. When the wastewater treatment apparatus 800 has a flow rate adjusting function, and the water is continuously transferred to the disinfecting tank by a constant amount by the flow rate adjusting function, the transfer amount to the disinfecting tank can be confirmed. From the viewpoint of stabilizing the quality of treated water, it is particularly preferable. In addition, as a structure which implement | achieves a flow volume adjustment function, not only the structure shown in FIGS. 2-4 but other various structures are employable. In addition, since the disinfection tank has a smaller capacity than other treatment tanks and various members such as a medicine cylinder are arranged, a large member such as a combination of a joint member and a measuring rod is disposed in the disinfection tank. Is often difficult to place. Therefore, if a transfer pipe as in each of the above-described embodiments is employed, the transfer amount to the disinfection tank can be confirmed without enlarging the waste water treatment apparatus.

  Further, the transfer pipe is not limited to the transfer flow path to the sterilization tank, and may be arranged at an arbitrary place that requires confirmation of the transfer amount per unit time. For example, a transfer pipe may be adopted as a transfer flow path from the second processing tank to the first processing tank. Moreover, the liquid transferred by the transfer pipe is not limited to water flowing through the treatment tank provided in the wastewater treatment apparatus, and may be any liquid. For example, when a liquid for water treatment is added to a treatment tank of a wastewater treatment apparatus (for example, when a nutrient source such as methanol or a flocculant is added), a transfer pipe is used as a transfer path for the liquid. May be used. Further, the total number of members sandwiched between the flange of the transfer pipe and the nut is not limited to 3, and may be any plural number. In this way, the transfer pipe and the plurality of members can be easily fixed to each other. However, the total number of members sandwiched between the flange and the nut may be one. In any case, if the transfer pipe is passed through one or more walls and the walls are sandwiched between the flange and the nut, the transfer pipe and the walls can be easily fixed to each other. Further, the member sandwiched between the flange and the nut is not limited to the wall of the treatment tank, and may be any member used in the wastewater treatment apparatus (for example, a plate for fixing the transfer pipe 900 may be used). .

800 ... Waste water treatment device 801 ... Tank body 802 ... Inlet 804 ... Outlet 810 ... Precipitation separation tank 812a ... Baffle 819 ... Partition plate 820 ... Anaerobic filter bed Tank 822 ... Filter medium 826 ... Downstream baffle 827 ... Transfer air lift pump 827i ... Suction port 828 ... Return weir 829 ... Partition plate 830 ... Aerobic filter bed tank 831 .. Contact aeration unit 832 ... Biofiltration unit 834 ... Contact material 835 ... Air diffuser 836 ... Filter material 837 ... Air diffuser 838 ... First partition plate 839 ... Second partition plate 839h ... Hole 839i ... Recess 840 ... Treatment water tank 848 ... Advection baffle 849 ... Circulating air lift pump 850 ... Disinfection tank 851 ... Bath body 851h ... Hole 851i ... Hole 852 ... Cylinder fixing baffle 852h ... Hole 852i ... Hole 853 ... Holding part 854 ... Drug cylinder 900, 900A, 900B, 900 C ... Transfer pipe 910 ... Pipe 911 ... Flow path 912 ... Screw part 914 ... Flange 916 ... Upper end 917, 918 ... Recessed part 919 ... End face 930, 930A, 930B , 930C, 930D, 930E, 930F ... Weir 931 ... First step 933, 933D ... Notch 934 ... Second step 934A ... Reference plate 934B ... Inclined portion 934C ... Second wall 936 ... Upper end surface 936 ... First surface 937 ... Second surface 937B ... Side 937C ... Side 938, 938B, 938C, 938D, 938E, 938F ... Reference part 939D ... V-shaped flow path 990 ... Nut 992 ... Ring-shaped member 994 ... Screw part 910e1 ... First end 910e2 ... Second end CA ... Arrow PA ... Region PU ... Upper part LWL ... Low water level HWL ... High water level

Claims (8)

A transfer pipe used for transferring liquid in a wastewater treatment apparatus,
A pipe part that forms a flow path through which liquid flows;
A flange fixed to the pipe portion;
A screw part formed on an outer peripheral surface of the pipe part, wherein the transfer pipe and the other pipes are sandwiched by another member different from the transfer pipe by the flange and a nut screwed into the screw part. A screw portion for fixing the members to each other;
A reference portion indicating a reference of the height of the liquid level relative to the liquid level;
With transfer pipe. The transfer pipe according to claim 1, further comprising:
A weir formed in the pipe portion, the weir having an outflow portion which is an open portion where the liquid flows from one side of the weir to the other side;
Transfer pipe. The transfer pipe according to claim 2,
The weir is a plate-like portion that intersects the flow path.
Transfer pipe. The transfer pipe according to any one of claims 1 to 3,
The reference part includes a three-dimensional part indicating a reference of the height of the liquid level of the liquid,
Transfer pipe. The transfer pipe according to any one of claims 1 to 4,
The reference part is provided at an end of the pipe part,
At least a part of the upper part of the pipe part above the reference part ends at the front of the reference part so as not to cover the upper part of the reference part.
Transfer pipe. The transfer pipe according to any one of claims 1 to 5,
The reference part includes a first reference part and a second reference part formed at a position lower than the first reference part.
Transfer pipe. A transfer pipe according to claim 6 when dependent on claim 2, comprising:
The dam includes a first step portion including an upper end surface and a second step portion having an upper surface located at a position lower than the upper end surface while blocking a part below the flow path.
The first reference portion includes the upper end surface of the first step portion,
The second reference part includes the upper surface of the second step part,
Transfer pipe. Wastewater treatment equipment,
A plurality of treatment tanks including a first treatment tank surrounded by a wall including a first wall and a second treatment tank surrounded by a wall including a second wall;
The transfer pipe according to any one of claims 1 to 7, wherein the water treated in the first treatment tank is transferred from the first treatment tank to the second treatment tank;
A nut screwed into the threaded portion of the transfer pipe;
With
The transfer pipe, the first wall, and the second wall are mutually connected by sandwiching a plurality of members including the first wall and the second wall by the nut and the flange of the transfer pipe. Fixed,
Wastewater treatment equipment.

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