JP2002119987A - Flow rate adjusting tank, anaerobic treatment tank and sewage cleaning tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact sewage cleaning tank further enhanced in capacity than before and capable of stably treating sewage. SOLUTION: A flow rate adjusting tank is divided into an upper effective part and a lower effective part by the horizontal surface of a water level half the maximum water level to be formed into a top-heavy shape wherein the volume of the lower effective part is 10-90% that of the upper effective part and the shape of an anaerobic treatment tank is bisected in the same way to be formed into each a fan shape wherein the volume of an upper effective part is 20-90% of the volume of a lower effective part, and these two tanks are provided side by side, and further, an aerobic treatment tank and a disinfection tank are provided to form the sewage cleaning tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flow control tank, an anaerobic treatment tank, and a sewage purification tank. More specifically, a flow control tank and an anaerobic treatment tank provided in a tank of a sewage purification tank for treating sewage or wastewater such as night soil and gray water, and particularly characterized in its shape, and the flow control tank and the anaerobic treatment tank The present invention relates to a sewage septic tank incorporated in a tank.

[0002]

2. Description of the Related Art Various types of sewage treatment tanks have been known. One example of these is an anaerobic filter tank (first chamber) and an anaerobic filter tank (second chamber) in this order from the upstream side as shown in FIG.
Chamber), an aerobic treatment tank, a sedimentation tank, and a disinfecting tank, and a flow control unit (HW.
L. And L. W. L. (A part sandwiched between the two) is provided (see Japanese Patent Application Laid-Open No. 4-367933).

Here, the purpose of the flow rate adjusting section is to stably treat sewage even when a large amount of sewage flows into the tank, that is, to temporarily store a large amount of sewage flowing into the tank. Meanwhile, this is to be supplied (liquid sending) to the downstream processing tank at a predetermined flow rate so as to stably perform the sewage treatment in the sewage purification tank. In addition, the liquid level of the sewage generally rises and falls in a flow rate adjustment region between the highest water level (HWL) and the lowest water level (LWL). Here, wasting space below the minimum water level must be avoided in the design of a sewage purification tank aiming at high efficiency and miniaturization. JP-A-4-3677 mentioned above
In the example of Japanese Patent Publication No. 93, this problem is dealt with by providing an anaerobic treatment tank below the flow rate adjusting unit.

FIG. 6 shows another conventional sewage treatment tank.
A sewage purification tank in which an anaerobic filter bed tank 2, an aerobic treatment tank 4, a sedimentation tank 5, and a disinfection tank 6 are arranged from the upstream side, and a sedimentation separation chamber 14 is provided in an upper part of the anaerobic treatment tank 2. (Japanese Utility Model Laid-Open No. 54-120165).

[0005] The purpose of the anaerobic treatment tank is to perform solid-liquid separation of the sewage flowing into the sewage purification tank, send the supernatant to the next tank, and perform anaerobic treatment of the settled solids (sedimented sludge). It is. In order for this anaerobic process to proceed efficiently,
Oxygen must not be supplied to the sediment sludge, i.e. the influent water must not contact the sediment sludge. Also,
Outflow of sediment sludge due to inflow water shock must be prevented.

In the example of Japanese Utility Model Application Laid-Open No. 54-120165, this problem is dealt with by providing a sedimentation separation chamber above the anaerobic treatment tank.

[0007]

An object of the present invention is a sewage purification tank having a flow control tank or an anaerobic treatment tank. The performance of the sewage purification tank is improved more than the conventional sewage purification tank, and the sewage purification tank is compact and can stably discharge sewage. An object of the present invention is to provide a sewage purification tank that can be treated, or to provide a flow control tank or an anaerobic treatment tank suitably used for such a sewage purification tank.

[0008]

In order to achieve the above object, the sewage purifying tank of the present invention has the following configuration.

That is, the present invention firstly relates to a flow control tank provided in a sewage purification tank, which has a maximum water level (HW).
L), when the flow control tank is divided into an effective upper part and an effective lower part by a horizontal plane at a half water level (hereinafter, abbreviated as HWL / 2), the effective lower part volume is equal to the effective upper part volume (HWL / 2). 10 to 90%.
% (Preferably 15% to 75%, more preferably 20%
６０60%).

In other words, when the tank is divided into an upper portion and a lower portion by the horizontal plane of HWL / 2, the volume of the lower portion (from the bottom surface to HWL / 2) is equal to that of the upper portion (from HWL / 2 to HWL / 2).
10% to 90% (preferably 15%) of the volume
流量 75%, more preferably 20% ６０60%) is a flow control tank 3 having a structure narrowed downward (a head-shaped or inverted L-shaped structure). If the volume of the lower part is less than 10% of the volume of the upper part, the space for disposing the pumping pipe of the liquid feed pump such as an air lift pump is too small, which is not preferable.

Here, the four circumferences of the flow control tank 3 are usually surrounded by an outer wall 8 of the sewage purification tank and one or more partition walls 9, and at least one of the partition walls 9 has a bent portion (throttle portion) in the middle. A partition wall which is erected with 9b is preferable.

In this case, the bent portion 9b is preferably formed at a minimum water level (LWL) or at a height in the vicinity thereof. Here, “near” means the maximum water level (HW
L) means within approximately 20% of the water depth at the time.

The flow control device in the flow control tank 3 preferably comprises an air lift pump 10 and a transfer pipe 11.

Further, the highest water level (HWL) and the lowest water level (L
WL), a filter bed 13 filled with a filler is preferably formed.

The present invention also divides the anaerobic treatment tank into an effective upper part and an effective lower part by an anaerobic treatment tank provided in the sewage purification tank, that is, a horizontal plane at half the level of the highest water level (HWL). At this time, the effective upper volume is 20% to 90% (preferably 30% to 80%, more preferably 40% to 70%) with respect to the effective lower volume (referred to as 100). The present invention also relates to an anaerobic treatment tank 2 having a certain feature. When the effective upper volume is less than 20% of the effective lower volume, when the accumulated sludge is scummed and floats, the space for storing the scum is undesirably too narrow.

Here, the four circumferences of the anaerobic treatment tank 2 are usually surrounded by an outer wall 8 of the sewage purification tank and one or more partition walls 9, and at least one of the partition walls 9 is preferably formed of the partition wall. At least one is a partition wall having a bent portion 9b in the middle and standing upright.

Further, a sedimentation separation chamber is provided in a part of the upper part of the anaerobic treatment tank 2 in which sewage is received in the sedimentation separation chamber, and the received sedimentable solids are anaerobically collected from the lower part of the sedimentation separation chamber. A structure in which the liquid is deposited on the bottom of the processing tank and deposited is preferable.

The present invention further relates to a sewage purifying tank in which any one of the flow control tanks 3 and any one of the anaerobic treatment tanks 2 are arranged in any order from the upstream side.

Here, it is preferable that the flow control tank 3 and the anaerobic treatment tank 2 are separated by a common partition wall.

Further, the above-mentioned flow control tank 3 and anaerobic treatment tank 2
It is preferable to further arrange an aerobic treatment tank and a disinfection tank on the downstream side of.

[0021]

In the flow control tank 3 of the present invention, the effective lower volume is smaller than the effective upper volume, and the lowest water level is usually at the bent portion (throttle portion) or in the vicinity thereof. The space below the minimum water level, that is, a wasteful space where liquid cannot be sent, is small. Therefore, the flow control tank becomes compact.

In the anaerobic treatment tank 2 of the present invention, the effective upper volume is smaller than the effective lower volume. Liquid can be sent to the next tank. In addition, the outflow of sediment sludge due to the inflow water shock is small.

[0023]

Embodiments of the present invention will be described below more specifically with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a configuration of a sewage purification tank according to a first embodiment of the present invention. From the upstream side, the flow control tank 3, the anaerobic treatment tank 2, the aerobic treatment tank 4, the sedimentation tank 5, and the disinfection tank 6 are arranged in this order. As for the partition of the flow control tank 3, its three surfaces are also used as the outer wall (outer tank) 8 of the sewage purification tank,
The remaining one is a partition 9 between the anaerobic treatment tank 2 (9a / 9b).
/ 9c) is used. The sewage flowing into the flow rate adjusting tank 3 is flown by the flow rate adjusting device arranged in the flow rate adjusting tank 3.
The liquid is sent to the anaerobic treatment tank 2 on the downstream side.

The partition wall 9 of the flow control tank 3 has a vertical portion 9a / 9.
c and a bent portion (restricted portion) 9b, and LWL is formed at the level of the bent portion (restricted portion) 9b. Although not shown in the figure, the water level (H
WL / 2) is also at or near the bent portion (throttle portion) 9b. In addition, as can be seen from FIG.
The portion above b extends toward the anaerobic treatment tank 2 side (in other words, the anaerobic treatment tank 2 extends below the bent portion 9b toward the flow control tank 3 side), and the flow rate increases. The volume below the LWL in the adjustment tank 3 is small (conversely, the volume below the adjacent anaerobic treatment tank 2 is large).

The maximum water level (HWL) of the flow control tank 3
Filter bed 1 filled with packing material between the low water level (LWL)
3 are formed. Examples of the filler used include a net-like cylindrical shape, a skeleton-like spherical shape, a plate-like luffa-like shape, a small cylindrical shape, and a corrugated shape. Although it is not essential to provide the filter bed 13 in the flow control tank 3, if the filter bed 13 is provided, the filter bed 13 repeats submersion in sewage and exposure to the air. This is preferable because the reaction can proceed. This aerobic reaction does not require special components and equipment (eg, aeration from diffuser components).

Here, the flow rate adjusting device is composed of an air lift pump 10 for pumping sewage and a transfer pipe 11, and is also provided with a water distribution measuring mass 12. A general-purpose electric pump can be used instead of the air lift pump.

Next, the flow of sewage will be described with reference to FIG. First, the sewage enters the flow control tank 3 from the inflow port 1, is pumped by the air lift pump 10, is weighed by the weighing mass 12, and is sent to the anaerobic treatment tank 2 via the transfer pipe 11. In the anaerobic treatment tank 2, the sewage undergoes anaerobic decomposition together with the removal of contaminants, and then flows to the aerobic treatment tank 4. In the aerobic treatment tank 4, oxidation and decomposition of organic matter and nitrification of ammonia are performed by aeration, and the mixture is transferred to the precipitation tank 5. Then, it is sterilized in the disinfection tank 6 and discharged from the outlet 7.

FIG. 2 is a schematic view of the configuration of a sewage purification tank according to a second embodiment of the present invention. The difference from the sewage purification tank in FIG. 1 is that the flow control tank 3 and the anaerobic treatment tank 2 are arranged in reverse order. That is, the first tank is an anaerobic treatment tank 2, the second tank is a flow control tank 3, and the third and subsequent tanks are the same as in FIG. 1, arranged in the order of an aerobic treatment tank 4, a sedimentation tank 5 and a disinfection tank 6. Have been. The three walls of the anaerobic treatment tank 2 are also used as the outer wall 8 (outer tank) of the sewage purification tank, and the remaining one is a partition wall 9 (9a / 9b / 9c) between the anaerobic treatment tank 2 and the flow control tank 3.

When the volume of the lower part is larger than that of the upper part of the anaerobic treatment tank 2, the sludge (sedimented sludge) deposited on the bottom of the anaerobic treatment tank 2 is hardly affected by the flow of the liquid, and the accumulated sludge is transferred to the next tank. The anaerobic reaction easily proceeds there without spilling. As the anaerobic reaction of the sedimentary sludge proceeds, the sedimentary sludge is digested, so that the capacity required for storing the sedimentary sludge is small.

In the flow of sewage in FIG. 2, raw sewage first enters an anaerobic treatment tank 2 from an inlet 1 and is separated into solid and liquid.
After being subjected to the anaerobic treatment, it is transferred to the flow control tank 3. The sewage entering the flow control tank 3 is pumped by an air lift pump 10 and sent to the aerobic treatment tank 4 via a transfer pipe 11. The process after the aerobic treatment tank 4 is the same as the description of FIG.

FIG. 3 is a schematic diagram of a configuration of a sewage purification tank according to a third embodiment of the present invention. The difference from the sewage treatment tank of FIG.
The point is that a sedimentation separation chamber 14 is provided above the anaerobic treatment tank 2.

The sedimentation separation chamber 14 has two partition plates 15 (15
a / 15b), and when viewed from the side, one 15a of the partitioning plate 15 has a
5b is an inverted "C" shape, and has a funnel shape in which the lower part is narrower than the upper part facing each other. And
Since the lower end of the other 15b is shaped to enter below the lower end of the one 15a, even if the deposited sludge is scummed and floats, it does not float in the settling / separation chamber 14.

By installing the sedimentation separation chamber 14 above the anaerobic treatment tank 2, the sedimentary sludge is hardly affected by the flow of the liquid, and the anaerobic reaction is performed without the sedimentation sludge flowing out to the next tank. proceed.

Incidentally, in the example of FIGS.
At least one of the four circumferential partition walls surrounding the vertical section and the bent section that rises obliquely, but instead of this, as shown in FIG. Place it (the cross-sectional shape will be approximately trapezoidal)
The lower volume may be 10% to 90% of the upper volume. In this case, there are no clear vertical portions and bent portions (throttle portions) as described above.

[0035]

According to the flow regulating tank of the present invention, the space below the minimum water level can be effectively used without waste. Providing a filter bed between the highest and lowest water levels can also promote aerobic reactions therewithout having to provide special components and equipment (eg, aeration from a diffuser). ADVANTAGE OF THE INVENTION According to the anaerobic treatment tank of this invention, the sediment sludge of a tank bottom is hard to be affected by the liquid turbulence by the inflow of sewage, it is hard to flow out to the next tank, and an anaerobic biological reaction also advances easily. If a sedimentation separation chamber is installed in the upper part of the anaerobic treatment tank, the sediment sludge at the bottom of the tank is hardly affected by the liquid flow, hardly flows out to the next tank, and the anaerobic reaction easily proceeds. According to the sewage treatment tank of the present invention, the performance is further improved, and the sewage treatment tank can be compactly treated stably.

[Brief description of the drawings]

FIG. 1 is a schematic diagram (viewed from the front) of a sewage purification tank according to a first embodiment of the present invention.

FIG. 2 is a schematic structural view (view from the front) of a sewage purification tank according to a second embodiment of the present invention.

FIGS. 3A and 3B are schematic diagrams of a configuration of a sewage purification tank according to a third embodiment of the present invention, in which FIG. 3A is a front view and FIG. 3B is a side view of an anaerobic treatment tank.

FIG. 4 is a schematic diagram (viewed from the front) of a configuration of a sewage purification tank according to a fourth embodiment of the present invention.

FIG. 5 is a schematic diagram of a configuration of a conventional sewage purification tank.

FIG. 6 is a schematic diagram of the configuration of another conventional sewage purification tank.

[Explanation of symbols]

 1: Inlet 2: Anaerobic treatment tank 3: Flow control tank 4: Aerobic treatment tank 5: Sedimentation tank 6: Disinfection tank 7: Outlet 8: Outer wall (outer tank) of sewage purification tank 9: Partition wall 9a, 9c: Vertical part of partition wall 9b: Bent part of partition wall (throttle part) 10: Air lift pump 11: Transfer pipe 12: Water separation measuring mass 13: Filter bed 14: Settling separation chamber 15a, 15b: Partition plate 16: Air diffuser (Aeration tube) 17: Filter bed

Claims (11)

[Claims] 1. A flow control tank provided in a sewage purifying tank, wherein the flow control tank is divided into an effective upper part and an effective lower part by a horizontal plane at a half level of the highest water level (HWL). The flow regulating tank, wherein the effective lower volume is 10% to 90% of the effective upper volume. 2. The four circumferences are surrounded by an outer wall of a sewage purification tank and one or more partition walls, and at least one of the partition walls is provided upright with a bent portion in the middle. Item 1. The flow control tank of Item 1. 3. The flow rate adjusting tank according to claim 2, wherein the bent portion is formed at a height at or near the lowest water level (LWL). 4. The flow control device in the flow control tank comprises an air lift pump and a transfer pipe.
3. The flow control tank according to any one of (1) to (3). 5. The flow control tank according to claim 1, wherein a filter bed filled with a filler is formed between the highest water level and the lowest water level in the tank. 6. An anaerobic treatment tank provided in a sewage purification tank, wherein said anaerobic treatment tank is divided into an effective upper part and an effective lower part by a horizontal plane at a half level of the highest water level (HWL). An anaerobic treatment tank wherein the effective upper volume is 20% to 90% of the effective lower volume. 7. The four circumferences are surrounded by an outer wall of a sewage treatment tank and one or more partition walls, and at least one of the partition walls is provided upright with a bent portion in the middle. Item 6. Anaerobic treatment tank. 8. The anaerobic treatment tank according to claim 6, wherein a sedimentation separation chamber is provided in an upper part of the tank. 9. The flow control tank according to claim 1, wherein:
A sewage purification tank in which the anaerobic treatment tank according to any one of claims 6 to 8 is arranged in any order from the upstream side. 10. The sewage treatment tank according to claim 9, wherein the flow control tank and the anaerobic treatment tank are separated by a common partition wall. 11. The sewage treatment tank according to claim 9, wherein an aerobic treatment tank and a disinfection tank are further disposed downstream.