JP6548395B2 - Waste water treatment equipment - Google Patents

Description

  The present disclosure relates to a wastewater treatment device for treating wastewater.

  Wastewater treatment has conventionally been performed using microorganisms. As a waste water treatment apparatus that performs such waste water treatment, an apparatus that accommodates a plurality of water treatment tanks (for example, a plurality of water treatment tanks including an anaerobic filter bed tank and a contact aeration tank) is used. In the waste water treatment apparatus which accommodates a plurality of water treatment tanks, a partition plate (also referred to as partition wall) that divides the plurality of water treatment tanks is provided.

Unexamined-Japanese-Patent No. 2006-272053

  By the way, a partition wall may form an advection opening for advection of water from one side of the partition wall to the other side. However, when the partition wall forms an advection opening, a problem may occur. For example, the strength of the partition wall may be reduced.

  The present disclosure discloses a technique capable of suppressing a defect when the partition wall forms an advection opening.

The present disclosure, for example, discloses the following aspects or application examples.
[Aspect]
Waste water treatment equipment,
An outer wall forming a space for accommodating a plurality of water treatment tanks including a first water treatment tank and a second water treatment tank,
A partition wall which partitions between the first water treatment tank and the second water treatment tank in the space formed by the outer wall;
Equipped with
The partition wall is
A part of the inner surface of the first water treatment tank and a part of the inner surface of the second water treatment tank, and further, in the advection opening communicating the first water treatment tank and the second water treatment tank A main wall forming an opening edge which is at least part of the edge;
A protrusion which protrudes toward the second water treatment tank side from at least a part of the opening edge;
Including
The partition wall has a recess in which the outer peripheral edge of the partition wall is recessed toward the inner peripheral side of the partition wall,
A gap between the recess and the outer wall corresponds to the advection opening,
The vertical length of the advection opening is longer than the horizontal length of the advection opening,
The whole of the recess is provided at a position higher than the lower end of the partition wall.
Waste water treatment equipment.

Application Example 1
Waste water treatment equipment,
An outer wall forming a space for accommodating a plurality of water treatment tanks including a first water treatment tank and a second water treatment tank,
A partition wall which partitions between the first water treatment tank and the second water treatment tank in the space formed by the outer wall;
Equipped with
The partition wall is
A part of the inner surface of the first water treatment tank and a part of the inner surface of the second water treatment tank, and further, in the advection opening communicating the first water treatment tank and the second water treatment tank A main wall forming an opening edge which is at least part of the edge;
A protrusion which protrudes toward the second water treatment tank side from at least a part of the opening edge;
Waste water treatment equipment, including:

  According to this configuration, since the partition wall includes the projecting portion that protrudes toward the second water treatment tank side from at least a part of the opening edge, it is possible to suppress a decrease in the strength of the partition wall.

Application Example 2
The waste water treatment apparatus according to Application Example 1 is,
The advection opening is an opening through which water is transferred from the first water treatment tank to the second water treatment tank.
Waste water treatment equipment.

  According to this configuration, it is possible to suppress the decrease in the strength of the partition wall while suppressing the backflow of water through the advection opening by the projection.

Application Example 3
The waste water treatment apparatus according to application example 1 or 2, wherein
The partition wall has a recess in which the outer peripheral edge of the partition wall is recessed toward the inner peripheral side of the partition wall,
A gap between the recess and the outer wall corresponds to the advection opening,
Waste water treatment equipment.

  According to this configuration, reduction in strength of the partition wall can be suppressed as compared with the case where the advection opening is a through hole provided in the main wall portion.

Application Example 4
The waste water treatment apparatus according to Application Example 3 is,
The vertical length of the advection opening is longer than the horizontal length of the advection opening,
Waste water treatment equipment.

  According to this configuration, the spread of the advection opening toward the inner portion of the partition wall is suppressed as compared with the case where the horizontal length of the advection opening is longer than the vertical length of the advection opening. As a result, it is possible to suppress a decrease in the strength of the partition wall while improving the degree of freedom in designing the inner portion of the partition wall.

Application Example 5
In the wastewater treatment apparatus according to any one of the application examples 1 to 4, when an upstream water treatment tank among the first water treatment tank and the second water treatment tank is referred to as an upstream water treatment tank,
The upstream water treatment tank has a baffle for guiding water flowing into the upstream water treatment tank from the upper side to the lower side,
The upper end of the advection opening is located higher than the lower end of the baffle,
The lower end of the advection opening is located lower than the lower end of the baffle,
Waste water treatment equipment.

  According to this configuration, the water flowing into the upstream water treatment tank through the baffle can reach the advection opening without moving further deeper in the upstream water treatment tank. As a result, it is possible to suppress the decrease in the strength of the partition wall while suppressing that the sediment deposited on the bottom of the upstream water treatment tank is stirred.

Application Example 6
The waste water treatment apparatus according to Application Example 4 or 5 in a case subordinate to Application Example 3;
The partition wall includes an outer peripheral protruding portion provided along the entire periphery of the outer peripheral edge of the partition wall and protruding toward the second water treatment tank side.
The protruding portion protruding from the opening edge is a part of the outer peripheral protruding portion,
Waste water treatment equipment.

  According to this configuration, the peripheral projection can improve the strength of the partition wall.

  Note that the technology disclosed in the present specification can be realized in various forms, and can be realized, for example, in the form of a partition wall, a drainage treatment apparatus including the partition wall, or the like.

It is explanatory drawing which shows the processing flow of the waste-water-treatment apparatus 800 as one Example. It is the schematic block diagram which looked at the waste water treatment apparatus 800 from the side. A schematic configuration of the wastewater treatment device 800 is shown. A schematic configuration of the wastewater treatment device 800 is shown. FIG. 7 is an exploded perspective view of an outer wall 801 and a partition wall 900. FIG. 10 is a perspective view of a partition wall 900. It is the schematic which looked at the partition wall 900 facing + X direction from the -X side. FIG. 16 is a schematic view showing the flow of water in the vicinity of the advection opening 814. It is a perspective view which shows another Example of a partition wall. It is the schematic which shows the flow of water in the vicinity of the advection opening 990B. It is the schematic which shows the modification of a waste-water-treatment apparatus.

A. First embodiment:
FIG. 1: is explanatory drawing which shows the processing flow of the waste-water-treatment apparatus 800 as one Example. The waste water treatment apparatus 800 of this embodiment performs purification treatment of waste water from general households etc. (Such apparatus is also called "septic tank"). The waste water 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, in order from the upstream side (the left side of FIG. 1), the debris removal tank 810, the anaerobic filter bed 820, the contact filter bed 830, the treated water tank 840, and the disinfection tank 850. Each water treatment tank is accommodated. The waste water flowing into the waste water treatment apparatus 800 is discharged to the outside of the waste water treatment apparatus 800 after being sequentially treated in the contaminant removal tank 810, the anaerobic filter bed 820, the contact filter bed 830, the treatment water tank 840, and the disinfection tank 850. Be done. Hereinafter, the water flowing in each water treatment tank is referred to as "water to be treated" or simply "water".

  FIG. 2 is a schematic configuration view of the waste water treatment apparatus 800 viewed from the side. FIG. 3 shows a schematic configuration of the waste water treatment apparatus 800 viewed downward from the A-A cross section in FIG. At the bottom of FIG. 3, two partial illustrations PE1 and PE2 are shown. A first partial explanatory view PE1 is an explanatory view showing respective walls of the contact filter bed 830 and the treatment water tank 840. Second part explanatory view PE2 partitions between an outer wall 801 (also referred to as “tank main body 801”) forming a space for housing the water treatment tanks 810 to 850, a contaminant removing tank 810 and an anaerobic filter bed tank 820 It is an enlarged view of the connection part with the partition wall 900. FIG. The details of these parts will be described later. FIG. 4 shows a schematic configuration of the waste water treatment apparatus 800 viewed from the cross section B-B in FIG. In these figures, the Z direction indicates the direction from the bottom to the top in the vertical direction, the X direction indicates the longitudinal direction (horizontal direction) of the wastewater treatment device 800, and the Y direction indicates the X direction and the Z direction. And a direction (horizontal direction) orthogonal to each other. Hereinafter, the X direction is also referred to as “+ X direction”, the X direction side is also referred to as “+ X side”, the opposite direction of the X direction is also referred to as “−X direction”, and the −X direction side is also referred to as “−X side”. The same applies to the Y direction and the Z direction.

  The contaminant removal tank 810 is a water treatment tank that separates contaminants in the waste water. As shown in FIGS. 2 and 3, the contaminant removal tank 810 is disposed at the most upstream portion of the waste water treatment apparatus 800. Waste water from the inflow port 802 (also referred to as dirty water) first flows into the dirt removal tank 810. The contaminant removal tank 810 has a solid-liquid separation means (in this embodiment, the inflow baffle 812) to separate the contaminants in the waste water from the water to be treated. The inflow baffle 812 of the present embodiment forms a flow path for guiding the water flowing into the contaminant removal tank 810 from the upper side to the lower side. Thereby, the inflow baffle 812 directs the flow direction of the solids contained in the water flowing into the contaminant removal tank 810 to the anaerobic filter bed 820 which is the water treatment tank on the downstream side (here, the + X direction). Rather, it can be directed to the bottom of the debris removal reservoir 810. As a result, the dirt removal tank 810 can deposit solids at the bottom.

  As shown in FIGS. 2 and 3, the partition wall 900 on the + X side of the contaminant removal tank 810 has the tank main body 801 approximately perpendicular to the longitudinal direction (here, the X direction) of the waste water treatment apparatus 800, It is a wall divided into a part on the + X side and a part on the -X side. Water from which contaminants have been separated (removed) is transferred to the anaerobic filter tank 820 through the advection opening 814.

  The anaerobic filter tank 820 is a water treatment tank that performs anaerobic treatment with anaerobic microorganisms. The anaerobic filter tank 820 has a filter medium 822 for the attachment of anaerobic microorganisms. By the anaerobic treatment, the organic matter in the water to be treated is decomposed. Also, the filter medium 822 can capture suspended matter in the water to be treated.

  As shown in FIGS. 2 and 3, the partition wall 803 on the downstream side (+ X side) of the anaerobic filter bed tank 820 is the tank main body 801 in the longitudinal direction (here, the X direction) of the waste water treatment apparatus 800. It is a wall that divides roughly into a part on the + X side and a part on the −X side. On the opposite side (+ X side) of the partition wall 803, substantially U-shaped side wall portions 843, 842 and 844 projecting from the partition wall 803 to the + X side (right side in FIG. 3) are viewed from above Is fixed. A space surrounded by the partition wall 803 and the side wall portions 843, 842, 844 corresponds to the processing water tank 840. Of the space on the + X side surrounded by the partition wall 803 and the tank main body 801, the space outside the side wall portions 843, 842, 844 corresponds to the contact filter floor tank 830. The configuration of the side wall portions 843, 842 and 844 will be described later.

  An advection opening 824 is formed in the part of the partition wall 803 which forms the boundary between the anaerobic filter bed tank 820 and the contact filter bed tank 830 (FIG. 2, FIG. 3). The advection opening 824 is disposed at the upper part of the partition wall 803, and the water surface WL is usually located in the middle of the advection opening 824. As described later, the water surface WL can fluctuate between the low water level LWL and the high water level HWL. The water treated in the anaerobic filter bed 820 is averted to the contact filter bed 830 through the advection opening 824.

  The contact filter bed 830 is a water treatment tank that performs aerobic treatment with aerobic microorganisms. As shown in FIG. 3, the contact filter bed 830 is formed so as to surround three sides (+ Y direction, + X direction, −Y direction) of the treatment water tank 840. As shown in FIG. 4, the contact filter bed 830 has contact members 832, 833 for the attachment of aerobic microorganisms. The second contact member 833 is disposed below the first contact member 832. Each of the contact members 832 and 833 is disposed on both sides (+ Y side and -Y side) of the treatment water tank 840 (FIG. 3, FIG. 4). Also, the contact filter bed 830 has a diffuser 834 located below the contact members 832, 833. A blower (not shown) is connected to the air diffuser 834. The diffuser 834 supplies the air supplied by the blower into the contact filter bed 830. Aerobic microorganisms utilize the oxygen contained in the air to degrade the organic matter in the water to be treated. The water treated in the contact filter bed 830 is transferred to the treatment water tank 840 through an advection opening 836 communicating the bottom of the contact filter bed 830 with the bottom of the treatment water tank 840.

  The treatment water tank 840 is a water treatment tank that temporarily retains the water transferred from the contact filter bed tank 830 and settles / separates solids (for example, sludge, suspended matter, etc.) in water. The treatment water tank 840 is an upward-flowing water treatment tank in which water flows in from the bottom.

  As shown in the first partial explanatory view PE1 of FIG. 3, the second side wall portion 842 faces the partition wall 803 and the third side wall portion 843 is the fourth side wall when viewed from the upper side of the vertical direction as viewed downward. It faces the part 844. The third side wall portion 843 connects the end portion 842 e 1 on the + Y side of the second side wall portion 842 and the partition wall 803. The fourth side wall portion 844 connects the end portion 842 e 2 on the −Y side of the second side wall portion 842 and the partition wall 803. The connection portion 843e between the third side wall portion 843 and the partition wall 803 and the connection portion 844e between the fourth side wall portion 844 and the partition wall 803 are disposed inside the both ends 803e1 and 803e2 of the partition wall 803 There is. The partition plate 803 forms a side wall (also referred to as a first side wall) on the −X side of the processing water tank 840.

  As shown in FIG. 2, the lower portion 849 of the processing water tank 840 has a so-called hopper structure (hereinafter, this lower portion 849 is also referred to as a “hopper portion 849”). In the hopper portion 849, the second side wall portion 842 is inclined with respect to the vertical direction, and the sectional area (horizontal sectional area) of the processing water tank 840 is smaller toward the bottom (the inclination of the second side wall portion 842 Portion 842 d is also referred to as “inclined portion 842 d”). Further, as shown in FIG. 4, in the lower portion 849L of the hopper portion 849, each of the third side wall portion 843 and the fourth side wall portion 844 is further inclined with respect to the vertical direction (side wall portion 843 , 844 can also be referred to as "slopes"). The lower portion 849L has a so-called three-sided hopper structure. Solids separated in the treatment water tank 840 are collected at the bottom of the treatment water tank 840 (a space narrower than the top of the treatment water tank 840) by the side wall parts 842, 843, 844.

  As shown in FIG. 2, the lower end of the partition wall 803 is connected to the bottom surface of the tank main body 801. On the other hand, as shown in FIG. 2 and FIG. 4, the lower ends of the side wall portions 842, 843 and 844 are separated from the bottom surface of the tank main body 801. The gap between the lower ends of the side wall portions 842, 843 and 844 and the bottom surface of the tank body 801 corresponds to the advection opening 836.

  As shown in FIG. 2, the processing water tank 840 is provided with a circulating air lift pump 860. The circulation air lift pump 860 is connected to a first advection pipe 861 extending upward from the bottom of the processing water tank 840 to above the high water level HWL, and to the top of the first advection pipe 861. And a second advection tube 863 extending in a gentle downward slope. The bottom end of the first advection tube 861 forms a suction port 862. The end of the second advection tube 863 on the side of the contaminant removal tank 810 forms an outlet 864. The second advection tube 863 penetrates the hole of the inflow baffle 812, and the outlet 864 is disposed in the inflow baffle 812. The circulating air lift pump 860 transfers (returns) solids and water from the bottom of the processing water tank 840 to the contaminant removal tank 810. As described above, since the lower portion 849 of the processing water tank 840 has a hopper structure, the solids separated in the processing water tank 840 are collected in a narrow space at the bottom (near the suction port 862). As a result, removal of separated solids from the treatment water tank 840 can be easily performed. The circulation air lift pump 860 is driven by the air from the blower (not shown) described above. The distribution amount of air from the blower is adjusted by a valve not shown. The circulating air lift pump 860 may be driven steadily. Also, the circulation air lift pump 860 may be intermittently driven.

  The disinfection tank 850 is a water treatment tank that disinfects the water to be treated. The disinfection tank 850 is disposed at the top of the treatment water tank 840 (FIG. 2). In the present embodiment, the disinfection tank 850 has a discharge air lift pump 870. The suction port 872 of the discharge air lift pump 870 is disposed at the low water level LWL in the treatment water tank 840, and the outlet 874 of the discharge air lift pump 870 is disposed upstream of the disinfection tank 850. Water in the vicinity of the water surface WL of the processing water tank 840 (water from which the solid matter has been separated) flows into the discharge air lift pump 870 from the suction port 872. Water flowing into the discharge air lift pump 870 is transferred little by little to the disinfecting tank 850 by the drive of the discharge air lift pump 870. The outlet air lift pump 870 can transfer water with the water level WL being equal to or higher than the low water level LWL. Thus, in the normal use state, the lowest water level WL is the low water level LWL. Such low water level LWL can be said to be the design lowest water level. Further, the discharge air lift pump 870 is driven by the air from the above-mentioned not-shown blower. The distribution amount of air from the blower is adjusted by a valve not shown.

  The disinfecting tank 850 has a drug cartridge 854 filled with a disinfectant (eg, solid chlorine agent). In the disinfecting tank 850, the water to be treated comes into contact with the disinfectant, and the disinfectant disinfects the water to be treated. The disinfected water is discharged to the outside of the waste water treatment apparatus 800 through the outlet port 804.

  When a large amount of drainage temporarily flows into the drainage processing apparatus 800 (for example, at the time of peak inflow), the water levels WL of the water treatment tanks 810, 820, 830, and 840 upstream of the discharge air lift pump 870 are temporary. In addition, it can rise above the normal water level (low water level LWL in the figure). In the example of FIG. 2, the water level WL may rise to the high water level HWL. When the water level WL exceeds the high water level HWL, water overflows from the treatment water tank 840 to the disinfecting tank 850 through an overflow opening (not shown) provided in the disinfecting tank 850. Thus, in normal use, the highest water level WL is the high water level HWL. Such high water level HWL can be said to be a design high water level. If the inflow water volume per unit time exceeds the assumed range, the water level may temporarily rise to a position higher than the high water level HWL.

  Thus, at the time of peak inflow, the water level in the plurality of water treatment tanks 810, 820, 830, 840 temporarily rises, thereby suppressing an increase in the amount of outflow from the contact filter bed 830 per unit time. . As a result, the possibility of untreated water flowing out of the contact filter bed 830 can be reduced. Thus, the discharge air lift pump 870 operates as a mechanism (referred to as a “peak cut mechanism”) that suppresses an increase in the amount of outflow from the contact filter bed 830 due to peak inflow per unit time.

  FIG. 5 is an exploded perspective view of the outer wall 801 and the partition wall 900. The outer wall 801 has an upper tank 801 u and a lower tank 801 d. The lower tank 801 d is a cup-shaped member that forms a lower portion of the outer wall 801. The upper edge of the lower tank 801d is provided with a flange 100d extending around the entire circumference. The upper tank 801 u is a cup-shaped member that forms the upper portion of the outer wall 801 and is disposed above the lower tank 801 d in a state of being convex upward. The upper tank 801 u has an inlet 802, a plurality of manhole openings 805, and an outlet 804 (in FIG. 5, the outlet 804 is hidden behind). Further, a flange 100u extending around the entire circumference is provided at the lower edge of the upper tank 801u. At the time of manufacture of the wastewater treatment device 800, members of the water treatment tanks 810 to 850 are attached to the lower tank 801d. Then, the upper tank 801 u is put on the lower tank 801 d. The upper tank 801u is fixed to the lower tank 801d (for example, the flanges 100u and 100d are adhered with an adhesive) in a state where the flange 100u of the upper tank 801u overlaps the flange 100d of the lower tank 801d. Thus, the water treatment tanks 810 to 850 are accommodated in the space surrounded by the upper tank 801 u and the lower tank 801 d.

  Further, the lower tank 801 d has two convex portions 210 d and 220 d that protrude inward. The second convex portion 220 d is disposed on the + X side of the first convex portion 210 d. The convex portions 210d and 220d are respectively continuous projecting portions extending perpendicularly to the X direction from the portion on the + Y side of the flange 100d to the portion on the −Y side of the flange 100d via the bottom portion of the lower tank 801d. is there. By providing the convex portions 210 d and 220 d in the lower tank 801 d, the strength of the lower tank 801 d can be improved. Hereinafter, the portion 200 d of the lower tank 801 d other than the convex portions 210 d and 220 d is also referred to as “main wall portion 200 d”.

  The upper tank 801 u also has convex portions 210 u and 220 u. The first convex portion 210u is a projecting portion connected to the upper side of the first convex portion 210d of the lower tank 801d, and extends perpendicularly to the X direction from the flange 100u to the front of the top of the upper tank 801u. The first convex portion 210u has a portion formed on the side wall portion on the −Y side of the upper tank 801u and a portion formed on the side wall portion on the + Y side (not shown behind the upper tank 801u), Contains. The second convex portion 220 u is a projecting portion connected to the upper side of the second convex portion 220 d of the lower tank 801 d. The configuration of the second convex portion 220u is the same as the configuration of the first convex portion 210u. By providing the convex portions 210u and 220u in the upper tank 801u, the strength of the upper tank 801u can be improved. Hereinafter, the portion 200 u of the upper tank 801 u other than the convex portions 210 u and 220 u is also referred to as “main wall portion 200 u”.

  A partition wall 900 is fixed to the inner surface on the + X side of the first convex portions 210d and 210u. As also shown in FIG. 2, the partition wall 900 divides the space formed by the upper tank 801 u and the lower tank 801 d (that is, the tank body 801) into a + X-side portion and a −X-side portion .

  FIG. 6 is a perspective view of the partition wall 900. FIG. 6A illustrates the −X side of the partition wall 900, and FIG. 6B illustrates the + X side of the partition wall 900. FIG. 7 is a schematic view of the partition wall 900 as viewed from the −X side toward the + X direction. A thick line in FIG. 7 indicates the inner surface 801s of the outer wall 801.

  As shown in FIG. 6, the partition wall 900 is a plate-like member extending in a direction approximately perpendicular to the X direction. On the -Y side of the partition wall 900, a recessed portion 990 is formed, which is a portion where the outer peripheral edge is recessed toward the inner peripheral side. As shown in FIG. 7, the outer peripheral edge of the partition wall 900 is joined to the inner surface 801 s of the tank main body 801 except for the concave portion 990. In the figure, the gap between the recess 990 and the inner surface 801s of the outer wall 801 is hatched. This gap corresponds to the advection opening 814 (FIG. 2, FIG. 3). As described above, the advection opening 814 is formed not by the through hole of the partition wall 900 but by the recess portion 990 and the tank main body 801, so that the advection opening 814 is formed by the through hole of the partition wall 900. The strength of the partition wall 900 can be suppressed from decreasing. Moreover, since the operation of opening the through hole for the advection opening in the partition wall 900 can be omitted, the partition wall 900 can be easily manufactured. In addition, it is possible to prevent the loss of material which occurs when the through hole is opened. Further, positional deviation of the advection opening with respect to the partition wall 900 can be suppressed as compared with the case of forming a through hole for the advection opening.

  Further, as shown in FIG. 6B, the partition wall 900 includes a main wall 910 extending approximately perpendicularly in the X direction, and a projection 930 provided on the outer peripheral edge of the main wall 910 and projecting to the + X side. have. The surface on the −X side of the main wall portion 910 (FIG. 6A) forms a portion on the + X side of the inner surface of the contaminant removal tank 810. The surface on the + X side of the main wall portion 910 (FIG. 6B) forms a portion on the −X side of the inner surface of the anaerobic filter bed tank 820. Further, a portion 992 of the main wall portion 910 which forms the edge of the recess 990 forms a part of the edge of the advection opening 814 (hereinafter, also referred to as “opening edge 992”). The protruding portion 930 protrudes from the edge of the main wall portion 910, and is provided along the entire outer periphery of the partition wall 900 (hereinafter, the protruding portion 930 is also referred to as "the outer peripheral protruding portion 930") .

  The protrusion 939 in the figure is a portion of the outer circumferential protrusion 930 connected to the opening edge 992. Thus, the partition wall 900 has a protrusion 939 projecting from the opening edge 992 which is a part of the edge of the advection opening 814. The projecting portion 939 protrudes in the direction (here, the + X side) intersecting with the expanding direction of the partition wall 900 (here, the direction perpendicular to the X direction). Therefore, even if the partition wall 900 has a shape in which a part of the partition wall 900 is missing like the recess 990, the strength of the partition wall 900 (especially, in the vicinity of the recess 990) is reduced. It can be suppressed. For example, deformation of the partition wall 900 by water pressure can be suppressed.

  In addition, when the advection opening 814 is small, the water level of the water treatment tank (here, the foreign substance removing tank 810) upstream of the advection opening 814 may increase unintentionally at the time of peak inflow. A large advection opening 814 may be employed to facilitate the advection of the water through the advection opening 814 and to control the unintended rise in water level. In general, as the advection opening 814 is larger, the strength of the partition wall 900 is likely to be reduced. In the present embodiment, the vicinity of the advection opening 814 of the partition wall 900 is reinforced by the projecting portion 939. Therefore, the advection opening 814 can be enlarged while suppressing the strength of the partition wall 900 from being reduced.

  Also, the protrusion 939 is provided over the entire recess 990 (that is, the entire opening edge 992). Therefore, the strength of the partition wall 900 can be improved as compared with the case where the protrusion 939 is provided only in a part of the opening edge 992.

  Further, the outer circumferential protruding portion 930 is provided over the entire circumference of the outer circumferential edge of the partition wall 900. The outer peripheral projection 930 protrudes in the direction intersecting the expanding direction of the partition wall 900. Accordingly, the overall strength of the partition wall 900 can be improved. Further, a protruding portion 939 protruding from the opening edge 992 is a part of the outer peripheral protruding portion 930. Therefore, since it is not necessary to form the protrusion 939 separately from the outer peripheral protrusion 930, the partition wall 900 can be easily manufactured.

  The connection part by the side of -Y of the partition wall 900 and lower tank 801d is expanded and shown by 2nd part explanatory drawing PE2 of FIG. In the second partial explanatory view PE2, a cross section perpendicular to the Z direction is shown. The first convex portion 210 d of the lower tank 801 d has a first portion 212, an inner portion 214 and a second portion 216. The portions 212, 214, and 216 are connected in this order from the -X side to the + X side. These portions 212, 214, and 216 form a tapered convex portion that gradually narrows inward (here, the + Y side). Specifically, the inner portion 214 is the innermost (here, the + Y side) portion of the first convex portion 210d. The first portion 212 extends obliquely from the end portion 214 e 1 on the −X side of the inner portion 214 toward the −X side with respect to the X direction to the main wall portion 200 d. The second portion 216 extends obliquely from the end portion 214 e 2 on the + X side of the inner portion 214 toward the + X side with respect to the X direction to the main wall portion 200 d.

  The outer peripheral projection 930 of the partition wall 900 has a first portion 931 and a second portion 932. These portions 931 and 932 form a protrusion 930 that bends from the end portion 910e on the -Y side of the main wall portion 910 toward the + X side through a plurality of stages. Specifically, the first portion 931 extends from the end portion 910 e of the main wall portion 910 obliquely toward the + X side and the −Y side with respect to the X direction, and reaches the second portion 932. The second portion 932 extends obliquely from the end portion 931 e of the first portion 931 on the + X side toward the + X side and the −Y side with respect to the X direction. The extension direction of the second portion 932 is closer to the X direction than the extension direction of the first portion 931.

  The first portion 931 of the outer circumferential protrusion 930 faces the second portion 216 of the first protrusion 210 d. Further, the second portion 932 of the outer peripheral protruding portion 930 faces the main wall portion 200d of the lower tank 801d. In this state, the partition wall 900 is fixed to the lower tank 801 d (as a result, the tank body 801). As a method of fixing the partition wall 900 to the tank main body 801, any method can be adopted. For example, the partition wall 900 may be fixed to the tank body 801 using a rivet. In this case, the portions where the convex portions 210 d, 220 d, 210 u, 220 u of the tank body 801 and the partition wall 900 are in contact may be fixed by rivets. For example, a rivet may be attached so as to penetrate the first portion 931 of the partition wall 900 and the second portion 216 of the lower tank 801 d. Alternatively, the partition wall 900 may be fixed to the tank main body 801 using an adhesive. In any case, if the partition wall 900 is fixed to the convex portions 210 d, 220 d, 210 u, and 220 u of the tank main body 801, it is possible to suppress the displacement of the position of the partition wall 900 with respect to the tank main body 801. However, the partition wall 900 may be fixed to the main wall portions 200d and 200u apart from the convex portions 210d, 220d, 210u and 220u.

  Further, the joint between the partition wall 900 and the tank body 801 is sealed with a sealing material (for example, a silicon-based sealing material). For example, the sealing material seals between the first portion 931 of the partition wall 900 and the second portion 216 of the lower tank 801 d. In addition, a sealing material may be abbreviate | omitted in part or all of a junction part. For example, the sealing material may be omitted in a portion higher than the high water level HWL.

  FIG. 8 is a schematic view showing the flow of water in the vicinity of the advection opening 814. As shown in FIG. In the figure, a cross section perpendicular to the Z direction is shown. In the water treatment tank, water flow in various directions can occur. And the flow of water may collide with the wall. In such cases, water can flow along the wall. Flows F1, F2 and F3 in FIG. 8 show an example of the flow of water moving along the wall.

  The first flow F 1 indicates a flow of water approaching the advection opening 814 along the outer wall 801 in the contaminant removal tank 810. Such water passes through the advection opening 814 and flows into the anaerobic filter bed 820.

  The second flow F 2 indicates the flow of water approaching the advection opening 814 along the main wall portion 910 of the partition wall 900 in the contaminant removal tank 810. Such water may pass through the advection opening 814 and be transferred to the anaerobic filter bed 820.

  The third flow F3 indicates the flow of water approaching the advection opening 814 along the main wall 910 of the partition wall 900 in the anaerobic filter bed 820. In the present embodiment, the opening edge 992 of the main wall 910 is connected to a protrusion 939 that protrudes toward the anaerobic filter bed tank 820 side. The flow of water is directed by the protrusion 939 in the protruding direction of the protrusion 939 (here, the + X direction). The projecting direction of the projecting portion 939 is a direction from the opening edge 992 toward the anaerobic filter bed tank 820, and is a direction opposite to the direction toward the upstream contaminant removal tank 810 through the advection opening 814. Thus, as the third flow F3 shows, water flows away from the advection opening 814 without advection to the contaminant removal tank 810 through the advection opening 814. As a result, it is possible to suppress the backflow of water to the upstream side (here, the contaminant removal tank 810 side) through the advection opening 814. Further, in the present embodiment, a projection 939 is provided over the entire opening edge 992. Therefore, even if water approaches along the main wall 910 from various directions as viewed from the advection opening 814, backflow of water through the advection opening 814 can be suppressed.

  Also shown in FIG. 7 are two lengths LV, LH which indicate the size of the advection aperture 814. The first length LV is a vertical length, and the second length LH is a horizontal length. In the present embodiment, LV> LH. Accordingly, the spread of the advection opening 814 toward the inner portion of the partition wall 900 is suppressed. As a result, the degree of freedom in the design of the inner portion of the partition wall 900 can be improved. For example, a baffle that guides the circulating water from the second advection pipe 863 to the lower side may be fixed to the surface on the contaminant removal tank 810 side of the central portion of the partition wall 900.

  Also, as shown in FIG. 2, in the present embodiment, the upper end 814 u of the advection opening 814 is located higher than the lower end 812 d of the inflow baffle 812, and the lower end 814 d of the advection opening 814 is the lower end 812 d of the inflow baffle 812. It is located at a lower position. Therefore, the water flowing into the contaminant removing tank 810 through the inflow baffle 812 can reach the advection opening 814 without moving further deeper in the contaminant removing tank 810. As a result, it is possible to suppress that the sediment (for example, sludge etc.) deposited on the bottom of the contaminant removal tank 810 is agitated by the water moving in the contaminant removal tank 810.

  Further, as shown in FIG. 3, in the present embodiment, when looking downward, the main wall 910 of the partition wall 900 is parallel to the Y direction (hereinafter referred to as the main wall when looking downward) The direction parallel to the part 910 is also referred to as “main wall direction”. The recess 990 (i.e., the advection opening 814) is formed at the end in the main wall direction of the partition wall 900 (here, the end on the -Y side). Further, the position in the main wall direction (here, the Y direction) of the inflow baffle 812 is a position separated inward from the end in the main wall direction of the foreign substance removing tank 810 (in the present embodiment, the foreign substance removing tank 810 Roughly in the middle position). Therefore, compared with the case where the advection opening 814 is formed inside the end in the main wall direction of the partition wall 900 (for example, in the middle position in the main wall direction in the foreign substance removal tank 810), The horizontal distance to the advection opening 814 can be increased. As a result, the contaminants contained in the water flowing into the contaminant removal tank 810 from the inflow baffle 812 can be prevented from reaching the advection opening 814 without settling to the bottom of the contaminant removal tank 810. That is, the foreign matter separation capability of the foreign matter removal tank 810 can be improved.

  The partition wall 900 is manufactured, for example, by molding using a molding die (for example, hand lay up molding, spray up molding, injection molding, etc.). As a material of the partition wall 900, for example, various resins such as fiber reinforced plastic (FRP) and dicyclopentadiene can be adopted. In order to facilitate molding, when the outer peripheral projection 930 is traced in the direction of protruding from the main wall 910, it is preferable that the outer peripheral projection 930 gradually expand outward. According to this configuration, it is possible to easily release the mold after the entire partition wall 900 is molded in one molding. However, the partition wall 900 may be partially molded by multiple moldings.

B. Second embodiment:
FIG. 9 is a perspective view showing another embodiment of the partition wall. FIG. 9A shows the −X side of the partition wall 900B, and FIG. 9B shows the + X side of the partition wall 900B. The difference from the partition wall 900 of FIG. 6 is that the recess 990 is omitted, and instead, a through hole 990B is provided. The configuration of the other parts of partition wall 900B is the same as the configuration of the corresponding parts of partition wall 900. This partition wall 900B is applicable instead of the partition wall 900 of FIG.

  The partition wall 900B has a main wall portion 910B, an outer peripheral protruding portion 930B, a through hole 990B, and a protruding portion 939B. The main wall 910B is a wall that extends in a direction approximately perpendicular to the X direction, similarly to the main wall 910 in FIG. The surface on the −X side of the main wall portion 910 </ b> B (FIG. 9A) forms a + X side portion of the inner surface of the contaminant removal tank 810. The + X side surface (FIG. 9B) of the main wall portion 910 </ b> B forms a portion on the −X side of the inner surface of the anaerobic filter bed tank 820. The outer peripheral protruding portion 930B is provided on the outer peripheral edge of the partition wall 900B and protrudes to the + X side, similarly to the outer peripheral protruding portion 930 in FIG. The outer peripheral protruding portion 930B protrudes from the edge of the main wall portion 910B, and is provided over the entire periphery of the outer peripheral edge of the partition wall 900B.

  The through hole 990B is provided at a position near the position of the recess 990 in FIG. 6 in the main wall 910B. Further, the through hole 990B is provided at a position spaced inward from the outer peripheral edge of the partition wall 900B. Then, the through holes 990 B function as advection openings for advection of water from the contaminant removal tank 810 to the anaerobic filter bed tank 820 instead of the advection openings 814 in FIGS. 2 and 3. Hereinafter, the through hole 990B is also referred to as "advection opening 990B". Further, an annular portion 992B of the main wall portion 910B that forms the edge of the through hole 990B forms the entire edge of the advection opening 990B (hereinafter, also referred to as "opening edge 992B").

  The protrusion 939B protrudes from the opening edge 992B of the advection opening 990B to the + X side (that is, the side of the anaerobic filter bed 820). The protrusion 939B protrudes in the direction (here, the + X side) which intersects the expanding direction of the partition wall 900B (here, the direction perpendicular to the X direction). Therefore, even in the case where the partition wall 900B has a shape in which a part of the partition wall 900B is chipped like the through hole 990B, the strength of the partition wall 900B (particularly, in the vicinity of the through hole 990B) is reduced. Can be suppressed. Further, the protrusion 939B is provided over the entire circumference of the opening edge 992B of the advection opening 990B. Therefore, the strength of the partition wall 900B can be improved as compared with the case where the protrusion 939B is provided only in a part of the opening edge 992B of the advection opening 990B.

  Further, the upper end 990Bu of the advection opening 990B is located higher than the lower end 812d of the inflow baffle 812 (FIG. 2). The lower end 990 Bd of the advection opening 990 B is located lower than the lower end 812 d of the inflow baffle 812. Therefore, the water flowing into the contaminant removing tank 810 through the inflow baffle 812 can reach the advection opening 990 B without moving at a deeper position in the contaminant removing tank 810. As a result, it is possible to suppress that the sediment (for example, sludge etc.) deposited on the bottom of the contaminant removal tank 810 is agitated by the water moving in the contaminant removal tank 810.

  FIG. 10 is a schematic view showing the flow of water in the vicinity of the advection opening 990B. In the figure, a cross section perpendicular to the Z direction is shown. Flows F11 to F14 in FIG. 10 show an example of the flow of water moving along the wall.

  The first flow F11 and the second flow F12 indicate the flow of water approaching the advection opening 990B along the main wall 910B in the contaminant removal tank 810. Such water may pass through the advection opening 990 B and be transferred to the anaerobic filter bed 820.

  The third flow F13 and the fourth flow F14 indicate the flow of water approaching the advection opening 990B along the main wall 910B in the anaerobic filter bed 820. In the present embodiment, a protrusion 939B protruding toward the anaerobic filter bed tank 820 is connected to the opening edge 992B of the main wall 910B. The flow of water is directed by the protrusion 939B in the protruding direction of the protrusion 939B (here, the + X direction). The projecting direction of the projecting portion 939B is a direction from the opening edge 992B toward the anaerobic filter bed tank 820, and is a direction opposite to the direction toward the upstream contaminant removing tank 810 through the advection opening 990B. Accordingly, as indicated by the third flow F13 and the fourth flow F14, the water flows away from the advection opening 990B without advection to the contaminant removal tank 810 through the advection opening 990B. As a result, it is possible to suppress the backflow of water to the upstream side (here, the contaminant removal tank 810 side) through the advection opening 990B. Further, in the present embodiment, a projection 939B is provided over the entire opening edge 992B. Therefore, even when water approaches along the main wall 910B from various directions as viewed from the advection opening 990B, it is possible to suppress backflow of water through the advection opening 990B.

C. Modification:
(1) As a structure of the protrusion provided in the opening edge part of a partition wall, it can replace with said structure and can employ | adopt other various structures. For example, the protrusion may be provided on only a part of the opening edge. Further, the projecting direction of the outer peripheral projecting portion provided on the outer peripheral edge of the partition wall may be a direction opposite to the projecting direction of the projecting portion projecting from the opening edge. For example, when the partition wall is fixed to the inner surface on the −X side of the convex portion 210d (FIG. 3), the outer peripheral protruding portions 930 and 930B of the partition walls 900 and 900B (FIG. 6, FIG. 9) protrude to the −X side. May be Also in this case, it is preferable that the protrusions 939 and 939B protruding from the opening edges 992 and 992B protrude to the water treatment tank side (here, the + X side) on the downstream side. However, the projecting portion may project from the opening edge toward the water treatment tank side on the upstream side.

  FIG. 11 is a schematic view showing a modification of the waste water treatment apparatus. In the figure, a cross section perpendicular to the Z direction near the advection opening 814C is shown as in FIG. In this drainage treatment apparatus 800C, the partition wall 900 described in FIG. 6 is the surface on the −X side of the first convex portions 210d and 210u of the tank main body 801 described in FIG. 5 (for example, the second portion explanatory view of FIG. 3) It is being fixed to the inner surface of the 1st portion 212 of convex part 210d in PE2. Further, unlike the embodiment of FIG. 3, the direction of the partition wall 900 is rotated 180 degrees with the Z direction as the rotation axis. Accordingly, the recess 990 of the partition wall 900 is located at the end on the + Y side of the partition wall 900. The recess 990 of the partition wall 900 forms an advection opening 814 C surrounded by the recess 990 and the tank body 801. Water from the contaminant removal tank 810 flows into the anaerobic filter bed 820 through the advection opening 814C as indicated by arrow F20. In this modification, the outer circumferential protrusion 930 of the partition wall 900 protrudes on the −X side, that is, the side of the contaminant removal tank 810 upstream from the advection opening 814C. Thus, the outer peripheral projection may project toward the water treatment tank side upstream from the opening edge.

  Also, the projecting direction of the projection projecting from the opening edge (that is, the extending direction of the projection) is the direction perpendicular to the main wall (for example, the + X direction perpendicular to the main wall 910 in FIG. 6) It may be inclined in a direction oblique to the direction perpendicular to the main wall.

(2) As the configuration of the advection opening formed by the partition wall, various other configurations can be adopted instead of the above configuration. For example, the upper and lower ends of the advection opening (ie, the entire advection opening) are higher than the lower end of the inflow baffle (eg, lower end 812d of the inflow baffle 812 of FIG. 2) of the water treatment vessel upstream of the partition wall. The dividing wall may be configured to be arranged in position. In addition, the upper end and the lower end of the advection opening (that is, the entire advection opening) are disposed at a position lower than the lower end (for example, the lower end 812d of FIG. 2) of the inflow baffle of the water treatment tank upstream of the partition wall. The partition wall may be configured to In addition, the partition wall may be configured such that the horizontal length of the advection opening is longer than the vertical length. For example, in the embodiment of FIG. 7, LH> LV may be satisfied.

  In any case, the lower end of the advection opening is preferably disposed at a height equal to or lower than the design minimum water level. According to this configuration, water can be naturally transferred through the advection opening without using a powered transfer means such as an air lift pump. The upper end of the advection opening may be disposed at a height below the design low water level, or may be disposed at a height above the design high water level. Further, as the position of the advection opening, any other position can be adopted instead of the position close to the outer peripheral edge of the partition wall. For example, an advection opening may be formed in a central portion of the partition wall. The upper end and the lower end of the advection opening, the vertical length, and the horizontal length pass through from the upstream side to the downstream side of the partition wall when looking at the advection opening while facing the direction perpendicular to the main wall portion It may be specified based on the area.

(3) As the configuration of the outer peripheral protruding portion provided on the outer peripheral edge of the partition wall, other various configurations can be adopted instead of the above configuration. For example, the outer peripheral protruding portion may be provided on only a part of the entire circumference of the outer peripheral edge of the partition wall. For example, the outer peripheral protrusion may be omitted at a position higher than the design maximum water level. In addition, the entire outer peripheral protrusion may be omitted.

(4) As a structure of a partition, it can replace with said structure and can employ | adopt other various structures. For example, when the partition wall and another wall (for example, the tank body) are joined, there may be a gap between the partition wall and the other wall at a position higher than the design maximum water level. . Moreover, a partition wall may be joined not only to the outer wall (tank main body) of a waste-water-treatment apparatus but other walls (for example, other partition walls). Moreover, the baffle which forms the flow path connected to an advection opening may be fixed to a partition wall. Also, the partition wall may be configured by joining a plurality of members instead of being one continuous member. However, it is preferable that the whole of the partition be constituted by one continuous member. This can improve the strength of the partition wall.

(5) As the configuration of the inflow baffle provided in the water treatment tank on the upstream side of the partition wall, various other configurations for guiding water from the upper side to the lower side may be employed instead of the above configuration. For example, the outlet from which the water flows out of the inflow baffle may be provided on the side of the inflow baffle instead of the bottom as in the inflow baffle 812 of FIG. In any case, the water flowing out of the inflow baffle may move below the lower end of the inflow baffle. Therefore, to prevent the water moving from the inflow baffle to the advection opening from agitating the sediment (e.g., sludge) deposited at the bottom, the advection opening formed by the partition wall is more than the lower end of the inflow baffle It is preferable to extend from a high position to a position lower than the lower end of the inflow baffle. In other words, the upper end of the advection opening is preferably located higher than the lower end of the inflow baffle, and the lower end of the advection opening is preferably located lower than the lower end of the inflow baffle. The inflow baffle may be omitted.

(6) As the configuration of the outer wall (tank body) of the waste water treatment apparatus, various other configurations forming a space for accommodating a plurality of water treatment tanks may be employed instead of the configuration of the tank body 801 shown in FIG. It is. For example, the outer wall of the waste water treatment apparatus may be composed of a cylindrical body extending in a horizontal direction and two cap parts closing both ends of the body.

(7) As a structure of a waste-water-treatment apparatus, it can replace with said structure and can employ | adopt another various structure. For example, the contaminant removal tank 810 may be filled with an anaerobic filter medium. Moreover, it may replace with the contact filter bed tank 830, and may employ | adopt the carrier fluid tank which the support | carrier holding microorganisms flows. In addition, another water treatment tank may be fixed to the surface on the contaminant removal tank 810 side of the central portion of the partition wall 900. As another water treatment tank, for example, an iron electrode is used to elute iron ions in water, and an insoluble compound of iron and phosphorus is generated and precipitated, whereby the phosphorus of the water discharged from the wastewater treatment device You may employ | adopt the phosphorus removal tank which reduces the density | concentration of an acid ion.

  Moreover, as a peak cut mechanism, not only the discharge air lift pump 870 of the embodiment of FIG. 2 but various configurations can be adopted. For example, the wastewater treatment apparatus includes an aerobic treatment unit (for example, a contact filter bed 830) and a pre-treatment unit for receiving raw water and supplying the received raw water to the aerobic treatment unit (in the embodiment of FIG. 1) In the case of having the contaminant removal tank 810 and the anaerobic filter bed 820), it is possible to employ an air lift pump for transferring the water to be treated little by little from the pre-treatment unit to the aerobic treatment unit. Further, a weir (for example, a V-shaped weir or a small hole) may be adopted which limits the flow rate per unit time from the pre-processing unit to the aerobic processing unit. By providing such a peak cut mechanism, it is possible to reduce the possibility of untreated water flowing out from the aerobic treatment unit. However, the peak cut mechanism may be omitted. In this case, in each water treatment tank of the wastewater treatment device, the water level is approximately constant without fluctuation in a normal use condition. Such a constant water level can be said to be a design high water level.

  Moreover, as a processing flow, not only the flow shown in FIG. 1 but another arbitrary flow can be adopted. For example, a flow control tank having a water level sensor and a transfer pump controlled according to the water level specified by the water level sensor may be provided. Moreover, you may employ | adopt the waste-water-treatment apparatus which processes not only the drainage from a home but industrial drainage.

  In any case, the partition wall having a protrusion projecting from the opening edge is not limited to the wall partitioning the contaminant removal tank 810 and the anaerobic filter tank 820, and between any other two water treatment tanks. It is applicable to the dividing wall. For example, the partition wall 803 in FIG. 3 may have a protrusion that protrudes from the edge of the advection opening 824 toward the contact filter bed 830 side.

  Although the present invention has been described above based on the examples and modifications, the above-described embodiment of the present invention is for the purpose of facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit and the scope of the claims, and the present invention includes the equivalents thereof.

100d, 100u ... flange, 200d, 200u ... main wall, 210d, 210u ... first protrusion, 212 ... first portion, 214 ... inner portion, 216 ... second Part, 220d, 220u: second convex part, 800: drainage treatment device, 801: outer wall (tank body), 801d: lower tank, 801s: inner surface, 801u: upper tank , 802: inlet, 803: partition wall, 804: outlet, 805: manhole opening, 810: foreign matter removing tank, 812: inflow baffle, 812d: lower end 814 ... Advection opening 814 d ... Lower end, 814 u ... Upper end, 820 ... Anaerobic filter bed, 822 ... Filter medium, 824 ... Advection opening, 830 ... Contact filter bed 832: first contact material, 833: second contact material, 834: aeration device, 836: advection opening, 840: treated water tank, 842: second side wall, 842 d ... inclined portion, 843 ... third Wall portion, 843 e ... connection portion, 844 ... fourth side wall portion, 844 e ... connection portion, 849 ... hopper portion, 849 L ... lower portion, 850 ... disinfection tank, 854 .. .. Drug cylinder, 860: circulating air lift pump, 861: first advection pipe, 862: suction port, 863: second advection pipe, 864: outlet, 870: discharge air lift Pump, 872 ... suction port, 874 ... outflow port, 900, 900 B ... partition wall, 910, 910 B ... main wall, 910 e ... end portion, 930, 930 B ... perimeter protrusion Portion 931: First portion 931 e: End portion 932: Second portion 939, 939 B: Projection portion 990: Concave portion 990 B: Through hole (advection opening) 990 Bd lower end 990 Bu upper end 992 992 B opening edge 214e 1 214 e 2 end 842 e 1 842 e 2 end 803 e 1 end W ... Water surface (water level), LWL ... Low water level, HWL ... High water level, LV ... 1st length, LH ... 2nd length, PE 1 ... 1st part explanatory view, PE 2. .. Second part illustration,

Claims (4)

Waste water treatment equipment,
An outer wall forming a space for accommodating a plurality of water treatment tanks including a first water treatment tank and a second water treatment tank,
A partition wall which partitions between the first water treatment tank and the second water treatment tank in the space formed by the outer wall;
Equipped with
The partition wall is
A part of the inner surface of the first water treatment tank and a part of the inner surface of the second water treatment tank, and further, in the advection opening communicating the first water treatment tank and the second water treatment tank A main wall forming an opening edge which is at least part of the edge;
A protrusion which protrudes toward the second water treatment tank side from at least a part of the opening edge;
Only including,
The partition wall has a recess in which the outer peripheral edge of the partition wall is recessed toward the inner peripheral side of the partition wall,
A gap between the recess and the outer wall corresponds to the advection opening,
The vertical length of the advection opening is longer than the horizontal length of the advection opening,
The whole of the recess is provided at a position higher than the lower end of the partition wall.
Waste water treatment equipment. The waste water treatment apparatus according to claim 1, wherein
The advection opening is an opening through which water is transferred from the first water treatment tank to the second water treatment tank.
Waste water treatment equipment. It is a waste water treatment apparatus according to claim 1 or 2 , and when the upstream water treatment tank among the first water treatment tank and the second water treatment tank is called an upstream water treatment tank,
The upstream water treatment tank has a baffle for guiding water flowing into the upstream water treatment tank from the upper side to the lower side,
The upper end of the advection opening is located higher than the lower end of the baffle,
The lower end of the advection opening is located lower than the lower end of the baffle,
Waste water treatment equipment. It is the waste water treatment apparatus of any one of Claim 1 to 3, Comprising :
The partition wall includes an outer peripheral protruding portion provided along the entire periphery of the outer peripheral edge of the partition wall and protruding toward the second water treatment tank side.
The protruding portion protruding from the opening edge is a part of the outer peripheral protruding portion,
Waste water treatment equipment.

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