JPH10151500A - Sewage purifying tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently carry out wastewater treatment within a short time and lessen the volume of the tank main body by installing filter media in the upper side of a supporting body made of a porous plate and installed in the middle part in the vertical direction of the tank main body and forming a wastewater introducing chamber in the lower side. SOLUTION: Wastewater led to a wastewater introducing chamber L from a flow inlet 5 is purified while being passed through a filter medium 4 comprising pebble 4A in the lower layer, sand 4B in the middle layer, and activated carbon C in the upper layer from the lower side to the upper side and becoming purified water, the resultant water is discharged out of a flow outlet 7. At that time, the sludge M in the wastewater is inhibited from ascending by the filter medium 4 and reliably separated within a short time. In this way, by introducing wastewater into the filter medium 4 from the lower side to the upper side, the sludge M is precipitated in the bottom of a tank and the filter medium 4 is hardly clogged and the lower part of the filter medium 4 to which the sludge is easy to adhere is washed by flowing water and self-cleaning function can be expected and moreover, since the filter medium 4 and the supporting body 2 are positioned above the bottom of the tank, the sludge M can be easily taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purification tank for sewage containing sludge such as sludge.

[0002]

2. Description of the Related Art In general, not only civil works such as waterways and water treatment facilities, but also foundation works of buildings and structures, sludge containing sludge such as sludge and muddy water is removed by removing sludge so as not to deteriorate the environment. Has been released. Conventionally, a septic tank that sediments and separates sludge and discharges supernatant water has been employed. This septic tank is provided with a partition plate which divides the inside of the tank body into right and left and allows the lower part to be circulated, allows sewage to flow in from one compartment upper part of the tank body, and allows supernatant water to flow out from the other compartment upper part. It is designed to be released.

[0003]

In the above-mentioned prior art, however, it takes a considerable amount of time to settle and separate the sludge, and when the amount of the sewage is large, the sludge is discharged without being settled and separated. May require a considerably large volume tank. In particular, in the case of sludge such as sludge, there is a problem that the filter medium for flowing the sewage from the upper side to the lower side is difficult to use because it causes clogging immediately and requires a long settling time, so that the sewage cannot be sufficiently purified. .

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to flow sewage from the lower side to the upper side of a filter medium, thereby enabling the use of the filter medium to improve the efficiency of sewage purification. It is an object of the present invention to provide a sewage purifying tank which can be carried out in a timely and reliable manner, can be performed in a short time, the volume of the tank body can be made relatively small, and the washing and regeneration or replacement of the filter medium is easy.

[0005]

According to the present invention, the following technical measures have been taken to solve the above-mentioned problems. That is, the present invention provides a water-permeable support made of a perforated plate or the like at an intermediate portion in the vertical direction in the tank body, arranges a filter medium on the upper side of the support, and forms a sewage introduction chamber on the lower side. An inlet for guiding sewage to the sewage introduction chamber is provided at a lower portion of the tank body, and a purified water outlet is provided at an upper portion of the tank body (claim 1).

[0006] In this case, the sewage flowing into the sewage introduction chamber in the tank body flows upward from below the filter medium, is filtered, sludge is separated water, is purified, and is discharged from the outlet. Therefore, clogging of the filter medium is small, sewage is reliably and efficiently purified in a short time, and a large amount of sewage can be treated without increasing the volume of the tank body. In addition, the present invention provides a water-permeable support made of a perforated plate or the like at an intermediate portion in the vertical direction in the tank body, arranges a filter medium on the upper side of the support, and forms a sewage introduction chamber on the lower side. An inflow port for guiding sewage to the sewage introduction chamber at a lower portion of the tank body, a purified water outlet at an upper portion of the tub body, and an upwardly open sewage communicating with the sewage introduction chamber in front of the sewage inlet of the tank body. A receiving room is provided (claim 2).

[0007] In this case, the sewage is received in the sewage receiving chamber in front of the inflow port, and gently flows from the inflow port into the sewage introduction chamber below the filter medium in the tank body by the head, and a large amount of sludge flows into the sewage receiving chamber. It can be removed by settling and separation, and the clogging of the filter medium is less, and the filtration performance can be maintained for a long time.
The frequency of washing the filter medium can be reduced. And the present invention inclines the bottom plate of the tank body so that the sewage receiving chamber side is lower than the sewage introduction chamber, provides a gate for opening and closing the sewage inflow port, and provides a sludge discharge port on the side wall or the bottom plate of the sewage receiving chamber. Therefore, the inflow speed of the sewage into the tank body can be adjusted by opening and closing the gate, the sludge can be easily collected at the bottom of the sewage receiving chamber, and the sludge can be more easily taken out (claim 3).

Further, according to the present invention, since the filter medium is composed of a plurality of kinds of gravel, sand and / or activated carbon, sewage can be smoothly purified and the filter medium can be easily washed and regenerated. 4). Further, according to the present invention, the support is formed in a box shape capable of accommodating a filter medium having at least a bottom made of a perforated plate, a wire mesh, etc., and can be taken in and out together with the filter medium. In addition, cleaning and regeneration are easy, and the bottom of the tank body can be easily and efficiently cleaned (claim 5).

Further, according to the present invention, since the support is formed in a box shape capable of accommodating various filter media separately, it is possible to maintain the filtration function without mixing various filter media, and it is easy to replace the filter media and to easily clean and regenerate the filter media. In addition, the frequency of replacing the filter medium can be reduced, which is advantageous in terms of maintenance management.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which a tank body 1 is a rectangular box with an open top, and a support 2 made of a perforated plate is attached and detached via a support bracket 3 at an intermediate portion in the vertical direction inside the tank body 1. Filter medium 4 on the support 2
Is mounted, and the lower side is a sewage introduction chamber L.

On the lower side wall of the tank body 1, a sewage inflow port 5 and a sludge discharge port 6 communicating with the sewage introduction chamber L are provided, and the sewage is guided to the lower side of the filter medium 4, that is, the sewage introduction chamber L. At the same time, sludge M such as sludge deposited on the tank bottom is discharged from the sewage introduction chamber L. An inlet pipe 9 is connected to the sewage inflow port 5 via an on-off valve 8, and a sludge discharge pipe 12 is connected to the sludge discharge port 6 via an on-off valve 13. The inlet pipe 9 and the sludge discharge pipe 12 may be configured to be capable of forcibly inflowing and discharging sludge through a pump or the like.

The upper side wall of the tank body 1 is provided with a purified water outlet 7 for discharging supernatant water.
Is composed of a lower layer gravel 4A, an intermediate tank sand 4B, an upper layer activated carbon 4C, and the like. In the above embodiment, the sewage guided from the inflow port 5 into the sewage introduction chamber L passes through the filter medium 4 from the lower side to the upper side, and becomes supernatant water, that is, purified water.
It is discharged from the outlet 7. The sludge M in the sewage is prevented from rising by the filter medium 4, settles, and accumulates on the tank bottom. Therefore, the sludge in the sewage is separated in a short time and surely, the water is efficiently purified, and a relatively large amount of sewage can be purified.

When the filter medium 4 is clogged, the filter medium 4 is taken out of the tank body 1 and replaced or washed and regenerated. Sludge deposited on the tank bottom is taken out of the sludge discharge pipe 12 by opening the on-off valve 13. When cleaning the inside of the tank bottom, the filter medium 4 and the support 2 are taken out. As described above, when the sewage flows into the filter medium 4 from the lower side, the sludge sinks to the bottom of the tank as compared with the case where the sewage flows from the upper side. The lower part of the filter medium 4 which is easy to wash is washed with running water, so that a self-cleaning effect can be expected. Further, the filter medium 4 and the support 2 are located above the bottom of the tank, so that their removal is easy.

FIGS. 2 and 3 show a second embodiment of the present invention. The difference from the first embodiment is that the support 2 can individually accommodate the gravel 4A, sand 4B and activated carbon 4C of the filter medium 4. This is constituted by the box-shaped supports 2A, 2B, 2C which are open at the top, so that the filter media layers can be clearly separated to maintain the filtration performance, and the respective filter media 4A, 4B, 4C are not mixed. The first embodiment is superior to the first embodiment in that cleaning and regeneration and maintenance management are easy, and handling during cleaning and regeneration or replacement is easy.

The bottom plate 2D of each of the box-shaped supports 2A, 2B, 2C is made of a perforated plate or a wire mesh and a grid-like reinforcing member 14 (see FIG. 3). A hole is provided for attaching a hanging bracket or hooking a hanging hook, so that it can be easily taken in and out, and sufficient strength can be obtained. FIG. 4 shows a main part of a third embodiment of the present invention, which is different from the second embodiment in that three types of filter media 4A, 4B, and 4C are put in one box-shaped support 2 in layers. That is, the handling of the filter medium 4 is superior to that of the first embodiment.

A hanging member 15 is fixed inside the side wall 2E of the support 2. In each of the above embodiments of the present invention, the gravel 4A, the sand 4B, and the activated carbon 4C are used as the filter medium 4. However, the activated carbon 4C can be omitted.
Alternatively, another filter medium, for example, a fibrous body (such as a nonwoven fabric) can be employed, and further, other known filter media can be employed.

FIG. 5 shows a fourth embodiment of the present invention.
What is different from the above-described embodiment is that an upwardly open sewage receiving chamber 16 communicating with the sewage introduction chamber L is provided upstream of the sewage inlet 5 of the tank body 1, and the tank bottom 1A is inclined such that the sewage receiving chamber 16 side is lowered. Then, the inflow port 5 provided in the side wall 1B of the tank body 1 is enlarged (for example, the same size as the entire width of the tank body 1),
A gate 17 which can slide up and down is provided on the side of the receiving chamber 16 so that the inlet 5 can be opened and closed.

The inflow port 5 also serves as a sludge discharge port for taking out sludge from the sewage introduction chamber L.
A sludge discharge port 6 is provided at a lower portion (or a bottom plate), and an on-off valve 13 is provided.
Alternatively, the sludge may be taken out from the sludge discharge pipe 12. Although the filter medium 4 employs the gravel 4A and the sand 4B, activated carbon or another filter medium can be added.

According to the fourth embodiment, the sewage flows into the sewage receiving chamber 16 to calm the turbid flow at the time of inflow, and from the inflow port 5 to the sewage introduction chamber L below the filter medium 4 in the tank body 1 by the head. The sludge flows in gently, most of the sludge sinks and its floating is suppressed, and the sludge flows out from the purified water outlet 7 through the filter medium 4 from the lower side to the upper side. In this case, the amount of sludge that rises with the water decreases, and the amount of sludge captured by the filter medium 4 decreases, so that the filtering function of the filter medium 4 is maintained for a long time. Therefore, the filtration efficiency of the sewage is increased, and the frequency of washing or replacement of the filter medium 4 is reduced, so that the maintenance and management can be performed easily and the sewage can be reliably purified.

The gate 17 provided at the inflow port 5
Can be moved up and down to adjust the speed of inflow of sewage into the lower portion of the tank body 1. Further, the sludge M moves and accumulates on the bottom 1A of the tank body from the sewage introduction chamber L to the bottom of the sewage receiving chamber 16 and since the sewage receiving chamber 16 is open upward, the sludge M is scooped from the sewage receiving chamber 16. Discharge and discharge and removal are facilitated.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
In the fourth embodiment, as in the second embodiment, the supports 2A and 2B are used for each of the various filter media 4A and 4B, or the tank main body 1 has an arbitrary shape such as a cylindrical shape in addition to a rectangular shape.
A lid for closing the upper portion is provided on the tank body 1 or a plurality of tank bodies 1 are arranged, and the purified water outlet 7 of the tank body 1 on the pretreatment side is connected to the sewage inlet 5 of the tank body 1 on the post-treatment side. Thus, sewage may be purified in multiple stages.

[0022]

According to the present invention, as described above, a water-permeable support made of a perforated plate or the like is provided at the middle part in the vertical direction in the tank body, and a filter medium is provided above the support and A sewage introduction chamber is formed on the side, and an inlet for guiding sewage to the sewage introduction chamber is provided at a lower portion of the tank body, and a purified water outlet is provided at an upper portion of the tank body. Clogging can be reduced, sewage purification can be performed in a short time, reliably and efficiently, and the volume of the tank body can be made relatively small.

Further, a water-permeable support made of a perforated plate or the like is provided at an intermediate portion in the vertical direction in the tank body, a filter medium is provided above the support, and a sewage introduction chamber is formed below the support. An inflow port for guiding sewage to the sewage introduction chamber is provided at a lower portion of the tub body, a purified water outlet is provided at an upper portion of the tub body, and an upwardly open sewage receiving port communicating with the sewage introduction chamber at a stage preceding the sewage inlet of the tub body. Since the chamber is provided, sewage can be gently flowed from the inflow port to the lower side of the filter medium in the tank main body by the head, and a large amount of sludge can be settled and separated into the sewage receiving chamber, and clogged with the filter medium. And the filtration performance can be maintained for a long period of time, and the frequency of washing or replacement of the filter medium can be reduced.

Further, according to the present invention, the bottom plate of the tank body is inclined so that the side of the sewage receiving chamber is lower than the sewage introduction chamber, and a gate for opening and closing the sewage inlet is provided. Since it has an outlet,
The inflow speed of the sewage into the tank body can be adjusted by opening and closing the gate, and the sludge can be easily collected at the bottom of the sewage receiving chamber, and the sludge can be more easily taken out.

Further, since the filter medium is composed of a plurality of types of gravel, sand and / or activated carbon, the sludge can be filtered smoothly and reliably, and the filter medium can be easily washed and regenerated. Further, since the support is formed in a box shape capable of accommodating a filter medium formed of a perforated plate, a wire mesh or the like at least at its bottom, the filter medium can be easily taken in and out, and the washing and regeneration or replacement of the filter medium can be performed easily and efficiently. Can be done

Further, since the support is formed in a box shape in which various filter media can be individually accommodated, various filter media are not mixed, and a filtering function can be maintained. In addition, the frequency of replacing the filter medium can be reduced, which is advantageous for maintenance management.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 3 is an enlarged plan view of a box-shaped support according to the second embodiment.

FIG. 4 is a longitudinal sectional view showing a main part of a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank main body 2 Support body 4 Filter material 5 Sewage inflow port 6 Sludge discharge port 7 Purified water outflow port 16 Sewage receiving room 17 Gate L Sewage introduction room

Claims (6)

[Claims] 1. A water-permeable support made of a perforated plate or the like is provided at an intermediate portion in a vertical direction in a tank body, a filter medium is provided above the support, and a sewage introduction chamber is formed below the support. A sewage treatment tank, wherein an inlet for guiding sewage to the sewage introduction chamber is provided at a lower portion of the tank body, and a purified water outlet is provided at an upper portion of the tank body. 2. A water-permeable support made of a perforated plate or the like is provided at a vertically intermediate portion in the tank body, a filter medium is provided above the support, and a sewage introduction chamber is formed below the support. An inflow port for guiding sewage to the sewage introduction chamber at a lower portion of the tank body, and a purified water outlet at an upper portion of the tub body, and an upwardly open sewage receiving port communicating with the sewage introduction chamber at a stage preceding the sewage inlet of the tank body. A sewage purification tank characterized by having a chamber. 3. The bottom plate of the tank body is inclined so that the side of the sewage receiving chamber is lower than the sewage introduction chamber, a gate is provided for opening and closing the sewage inflow port, and sludge can be taken out of the sewage receiving chamber. The sewage purification tank according to claim 2. 4. The sewage treatment tank according to claim 1, wherein the filter medium is a plurality of kinds of gravel, sand, and / or activated carbon. 5. The support according to claim 1, wherein at least the bottom of the support is formed of a perforated plate, a wire mesh or the like, and has a box shape capable of accommodating the filter medium, and can be taken in and out of the tank body together with the filter medium. 3. The sewage purification tank according to 2. 6. The sewage treatment tank according to claim 5, wherein the support is formed in a box shape capable of individually storing various filter media.