JP2014046230A - Water treatment device and septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment device capable of showing a prescribed sludge storing capacity by suppressing clogging of a suction port of a transfer pump or a transfer conduit by a large solid matter such as a toilet paper, and by suppressing transfer of a solid matter into a sludge storing tank.SOLUTION: A water treatment device has a solid/liquid separation tank for separating a solid matter from water to be treated containing sludge, and a bisected sludge storing tank for storing sludge separated in the solid/liquid separation tank. In the water treatment device, a first sludge storing tank is communicated with a bottom part of the solid/liquid separation tank, the first sludge storing tank is connected to a second sludge storing tank through a connection port, the connection port is arranged under a communication opening between the first sludge storing tank and the solid/liquid separation tank, and an air diffuser and a transfer pump for transferring in-tank liquid in the second sludge storing tank to the first sludge storing tank are arranged respectively in the first sludge storing tank and the second sludge storing tank.

Description

  The present invention relates to a water treatment apparatus for treating domestic wastewater discharged from general households, and more particularly to a water treatment apparatus for storing solid-liquid separated sludge and a sewage septic tank provided with the same.

  Wastewater treatment is a function for separating and removing solids contained in sewage, a function for storing separated solids (sludge), and degrading pollutants contained in sewage after separating and removing solids by aerobic microorganisms. Function, function to separate and clarify suspended solids (SS) increased in aerobic microorganisms, function to disinfect treated water, and combine each function sequentially according to the nature of the wastewater to be treated It is made by processing.

As a sewage septic tank, it treats only human waste, but there are 6 million single-treatment septic tanks in Japan that drains daily wastewater (living wastewater excluding human waste, such as kitchen drainage, bathroom drainage, and bathroom drainage). In 2000, from the viewpoint of improving the water environment, the Septic Tank Law was revised and its establishment was abolished.
As a result, the newly established sewage septic tank was a merged processing septic tank that treats human waste and domestic wastewater together, but there are few existing single septic tanks that are newly installed. Many treatment septic tanks still remain. Factors that prevent the transition to the merger treatment septic tank include cost and lack of user benefits, but before that, the single treatment septic tank is installed in the space where the single treatment septic tank is installed. The main factor was the inability to accommodate large merged septic tanks.

Against this background, the development of a merged treatment septic tank that requires only about the installation space of a single treatment septic tank has been eagerly desired for a long period of time. In addition, it must be about 70% of the size that was said to be compact at that time (aerobic treatment using a carrier flow method or a biological filtration method), so it cannot be realized easily. It was. In particular, in order to store solid matter separated from sewage and excess sludge when microorganisms decompose and propagate pollutants, a certain amount of capacity must be secured, and this part must be reduced. Was a technical challenge.
In order to solve the above technical problem, earnest research has been done. Finally, in 2010, the single treatment septic tank based on the technique of sludge storage method by aerobic digestion shown in the following Patent Document 1 is shown. A merged septic tank that can be replaced has been commercialized.

Japanese Patent No. 4702748

However, the merged treatment septic tank developed by utilizing the technology described in Patent Document 1 has a structure in which solids or sludge separated in the first solid-liquid separation tank is directly transferred to the upper part of the aerobic digestion tank by a transfer pump. Therefore, if a large amount of toilet paper flows into the sewage at once, it will enter the pump directly from the suction port or suction port of the transfer pump and block the water channel inside the pump. There was a problem.
In such a state, solids or sludge separated in the first solid-liquid separation tank will not be transferred to the aerobic digestion tank, and at least once every four months, which is the frequency of maintenance inspections defined by the Septic Tank Law. In the worst case, sludge digestion will not proceed for 4 months. Furthermore, because the frequency of cleaning is set at least once a year in the Septic Tank Law, the sludge storage capacity of the combined treatment septic tank is designed for one year or more, but sludge digestion has not progressed for four months. Then, there is a concern that the sludge storage capacity reaches the limit in less than one year and the predetermined sludge storage capacity cannot be exhibited.

  The present invention has been made in view of the above circumstances, and provides a water treatment device capable of stably performing aerobic digestion of sludge by reducing clogging of a transfer pump as much as possible, and a sewage septic tank equipped with the same. Purpose.

The present invention relates to the following.
(1) Solid-liquid separation tank that separates solids from water to be treated containing sludge, two-part sludge storage that consists of a first sludge storage tank and a second sludge storage tank that store sludge separated in the solid-liquid separation tank A water treatment apparatus having a tank, wherein the first sludge storage tank communicates with a bottom of a solid-liquid separation tank, connects the first sludge storage tank and the second sludge storage tank at a connection port, and the connection port Is disposed below the communication opening of the first sludge storage tank and the solid-liquid separation tank, and each of the first sludge storage tank and the second sludge storage tank has an air diffuser and a tank of the second sludge storage tank. The water treatment apparatus which arrange | positioned the transfer pump which transfers internal liquid to said 1st sludge storage tank.

(2) Solid-liquid separation tank that separates solids from water to be treated containing sludge, two-stage sludge storage that consists of a first sludge storage tank and a second sludge storage tank that store sludge separated in the solid-liquid separation tank A water treatment apparatus having a tank, wherein the first sludge storage tank communicates with a bottom of a solid-liquid separation tank, connects the first sludge storage tank and the second sludge storage tank at a connection port, and the connection port Is disposed below the communication opening of the first sludge storage tank and the solid-liquid separation tank, and the first sludge storage tank and the second sludge storage tank are respectively provided with an air diffuser and the first sludge storage tank. The water treatment apparatus which has arrange | positioned the transfer pump which transfers the liquid in a tank to a said 2nd sludge storage tank.
(3) The water treatment device according to item (1), wherein a filter is disposed below a suction port of a transfer pump that transfers the liquid in the second sludge storage tank to the first sludge storage tank.
(4) The water treatment device according to item (2), wherein a filter is disposed below a suction port of a transfer pump that transfers the liquid in the first sludge storage tank to the second sludge storage tank.
(5) The water treatment device according to any one of items (1) to (4), an anaerobic treatment tank connected to an outlet formed in a solid-liquid separation tank of the water treatment device, and an aerobic treatment A sewage purification tank comprising a tank and a disinfection tank.
(6) A sewage purification tank in which a second solid-liquid separation tank is provided between the aerobic treatment tank according to item (5) and the disinfection tank.
(7) The solid-liquid separation of the sewage treated in each tank in each of the anaerobic tank, the aerobic tank, and the second solid-liquid separation tank according to item (6) A sewage septic tank equipped with a transfer pump that returns to the tank.

  According to the present invention, in a water treatment apparatus having a function of aerobically digesting and storing solid-liquid separated sludge and having a two-part sludge storage tank, the liquid in the tank of the two-part sludge storage tank is transferred. The clogging of the transfer pump can be reduced as much as possible, and a water treatment apparatus that can stably exhibit a predetermined sludge storage function for a long period of time can be provided.

It is sectional drawing of the water treatment apparatus based on 1st Example of this invention, FIG. 1 (A) is a longitudinal cross-sectional view, FIG.1 (B) is sectional drawing which follows the AA 'line of FIG. 1 (A). is there. It is sectional drawing of the water treatment apparatus based on 2nd Example of this invention, FIG. 2 (A) is a longitudinal cross-sectional view, FIG.2 (B) is sectional drawing which follows the AA 'line of FIG. 2 (A). is there. It is sectional drawing of the water treatment apparatus based on 3rd Example of this invention, FIG. 3 (A) is a longitudinal cross-sectional view, FIG.3 (B) is sectional drawing which follows the AA 'line of FIG. 3 (A). is there. It is sectional drawing of the water treatment apparatus based on 4th Example of this invention, FIG. 4 (A) is a longitudinal cross-sectional view, FIG.4 (B) is sectional drawing which follows the AA 'line of FIG. 4 (A). is there. It is sectional drawing of the wastewater septic tank incorporating the water treatment apparatus based on the 3rd Example of this invention. It is a transfer pump used for the sewage purification tank incorporating the water treatment apparatus based on the first embodiment of the present invention, and is a graph showing the transfer characteristics of the transfer pump installed in the second sludge storage tank.

The solid-liquid separation tank described in the present invention is not particularly limited as long as it has a solid-liquid separation function. Specifically, a precipitation separation tank, an anaerobic filter bed tank, or the like is used. Can do.
In the case of having a filter bed, a filter medium having a weak trapping property such as a filter medium regularly packed in a plate shape, a net-like plate shape, or a net-like cylindrical shape can be suitably used. The filter medium having a weak trapping property prevents sludge from accumulating on the upper part of the filter bed, and prevents sludge from becoming scum and flowing out to the next tank. And the installation position (upper surface position) of a filter medium can also be made into the position close | similar to the water surface above a solid-liquid separation tank, since sludge does not accumulate easily in the filter bed upper part.
In addition, when there is no filter medium, the cross-sectional area of the solid-liquid separation tank is secured in consideration of the water area load so that the solid or sludge is separated from the water to be treated by sedimentation and floating. It is preferable to arrange the inflow pipe and the outflow pipe in the middle portion when viewed in the direction.
The shape of the solid-liquid separation tank is not particularly limited, but it is preferable that the bottom part has a hopper structure. By doing so, the mud collection efficiency is improved and the first sludge storage tank communicated with the bottom part. Solid or sludge can be smoothly advected.

  In order to prevent solids or sludge transferred to the first sludge storage tank from accumulating as they are, a connection port between the first sludge storage tank and the second sludge storage tank is disposed below the bottom opening of the solid-liquid separation tank. . When transferring the liquid in the second sludge storage tank to the first sludge storage tank, a transfer pump is installed in the second sludge storage tank, and the liquid in the tank of the second sludge storage tank is transferred to the first sludge storage tank. Since it is transferred, the liquid in the tank of the first sludge storage tank is further transferred to the second sludge storage tank via the connection port. Since a water flow is generated below the communication opening between the solid-liquid separation tank and the first sludge storage tank in this way, among the solids transferred from the solid-liquid separation tank to the first sludge storage tank, the water flow is large. The solids are transferred to the second sludge storage tank together with the liquid in the first sludge storage tank together with the liquid in the first sludge storage tank. It will remain in the first sludge storage tank.

  The solids transferred to the second sludge storage tank are agitated by the air diffuser of the second sludge storage tank, repeatedly colliding with bubbles and becoming finer, undergoing aerobic biological treatment, the second sludge It becomes sludge in the same way as the liquid in the storage tank, and aerobic in each sludge storage tank while repeating advection from the second sludge storage tank to the first sludge storage tank and from the first sludge storage tank to the second sludge storage tank. Undergo biological treatment.

On the other hand, if the solid matter remaining in the first sludge storage tank is continuously accumulated, the solid sludge separation tank is blocked by the solid matter, and the predetermined sludge storage capacity is not exhibited. Even if it cannot be transferred to the storage tank, it is necessary to generate a water stream that is pushed out from directly under the solid-liquid separation tank. The strength (flow velocity) of the water flow may be determined by paying attention to the transfer capability of the transfer pump and the opening size of the transfer port, and becomes weaker if the opening size is too large. Therefore, it is desirable that the opening size of the advection port is smaller than the opening size projected on the partition wall between the first sludge storage tank and the second sludge storage tank at the bottom of the solid-liquid separation tank.
In view of the above, the solid matter remaining in the first sludge storage tank is pushed out from directly below the bottom opening of the solid-liquid separation tank and rides on the stirring flow generated by the air diffuser in the first sludge storage tank. , While receiving aerobic biological treatment with the liquid in the tank of the first sludge storage tank, it becomes fine sludge, and the advection from the first sludge storage tank to the second sludge storage tank and from the second sludge storage tank to the first sludge storage tank Repeat aerobic biological treatment in each sludge storage tank.

  When transferring the liquid in the first sludge storage tank to the second sludge storage tank, a transfer pump is installed in the first sludge storage tank, and the liquid in the tank in the first sludge storage tank is transferred to the second sludge storage tank. Furthermore, the liquid in the tank of the second sludge storage tank is transferred to the first sludge storage tank through the connection port. Since the liquid in the tank of the second sludge storage tank will be transferred to the first sludge storage tank through the connection port, a water flow is generated below the communication portion between the solid-liquid separation tank and the first sludge storage tank. Solids transferred from the solid-liquid separation tank to the first sludge storage tank are pushed onto the first sludge storage tank by riding on the water stream, and further, agitated by the air diffuser and diffused into the first sludge storage tank. become.

As described above, when transferring the liquid in the first sludge storage tank to the second sludge storage tank, even when transferring the liquid in the second sludge storage tank to the first sludge storage tank, the solid-liquid separation tank It is important to generate a water flow so that accumulated sludge does not accumulate in the communication part between the first sludge storage tank and the connection port of the first sludge storage tank and the second sludge storage tank. As described above, the position and shape are not particularly limited as long as the water flow can be generated, but considering the efficiency, the connecting portion between the solid-liquid separation tank and the first sludge storage tank It is preferable to arrange it below. In addition, the transfer pump that transfers the liquid in the tank is not particularly limited as long as sludge can be transferred, but an air lift pump that is easy to maintain can be preferably used.
In the first sludge storage tank and the second sludge storage tank, the purpose is to keep the inside of the tank in an aerobic state, to prevent agitation flow from accumulating sludge, and to make large solids such as toilet paper fine. Each is provided with a diffuser. If the solid material becomes fine, clogging of the transfer pump can be suppressed.

  In addition, if you want to further reduce the clogging of the transfer pump by making the solids finer, the first sludge storage tank or the second sludge storage tank is equipped with suction for the transfer pump that transfers the liquid in the tank. A filter can be installed below the mouth. The filter is not particularly limited as long as it is difficult for large solids such as toilet paper to pass through, and is regularly packed in a grid-like net, plate-like, net-like plate-like, or net-like cylindrical. Although it can be filled with filter media, etc., it should be noted that it is not blocked by solids or sludge trapped by the filter. preferable. In consideration of the above, since the solid matter repeatedly collides with the filter, it is likely to become fine, and if it does not pass through the filter, it will not reach the suction port of the transfer pump. Moreover, a filter can also be installed in both a 1st sludge storage tank and a 2nd sludge storage tank.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic sectional view of a water treatment apparatus according to the first embodiment of the present invention. As shown in FIG. 1, the water treatment apparatus 1 according to the first embodiment includes a solid-liquid separation tank 2 in which the inside of a tank composed of a peripheral wall 1A and a bottom wall 1B is partitioned by partition walls 2A and 4A, and first sludge. It has a storage tank 3 and a second sludge storage tank 4.
The solid-liquid separation tank 2 has a hopper shape in which a bottom wall 2B having a narrowed shape is provided on the bottom 2a side. The bottom 2a communicates with the bottom 3a of the first sludge storage tank 3, and the solid-liquid separation tank A connection port 5 for the first sludge storage tank 3 and the second sludge storage tank 4 is provided below the bottom opening of 2. Moreover, the transfer pump 6 which transfers the liquid in the tank of the 2nd sludge storage tank 4 to the 1st sludge storage tank 3 is arrange | positioned at the upper side of the 2nd sludge storage tank 4, and the 1st sludge storage tank 3 and the 2nd Air diffusers 7 and 8 are provided at the bottom of the sludge storage tank 4. In this embodiment, a connection port 5 is provided at the bottom of the partition wall 4A that partitions the solid-liquid separation tank 2 and the second sludge storage tank 4, and in this embodiment, the connection port 5 is scattered at almost the same height as the lowest position of the connection port 5. Air devices 7 and 8 are provided. In addition, the opening dimension of the connection port 5 is larger than the opening dimension when the opening of the bottom 2a of the solid-liquid separation tank 2 is projected on the partition wall 4A between the first sludge storage tank 3 and the second sludge storage tank 4. It is desirable to make it smaller.

  Further, an inflow part 9 constituted by a pipe that passes through the upper part of the first sludge storage tank 3 and reaches the upper part of the solid-liquid separation tank 2 is formed, and the water to be treated passes through the inflow part 9 and the solid-liquid separation tank 2. It has a structure that flows into the interior. In this example, the front end portion 9a of the inflow portion 9 is disposed downward along the partition wall 2A that partitions the solid-liquid separation tank 2 and the first sludge storage tank 3, and sewage is discharged from the front end portion 9a to the solid-liquid separation tank 2. Can be supplied inside. In the solid-liquid separation tank 2, a partition wall 10A is provided at a position near the peripheral wall on the side facing the installation position of the distal end portion 9a, and the outflow portion 10 is formed. A discharge port 10a is formed near the upper portion of the outflow portion 10 in the peripheral wall 1A.

Next, a process for treating the water to be treated will be described.
First, the water to be treated passes through the inflow portion 9 and flows into the solid-liquid separation tank 2 inside the water treatment apparatus 1 from the tip end portion 9a. In the solid-liquid separation tank 2, the solids in the water to be treated are separated by the precipitation separation action due to gravity. The treated water from which the solid matter has been removed flows out from the discharge port 10a through the outflow portion 10.
On the other hand, since the bottom 2a of the solid-liquid separation tank 2 communicates with the first sludge storage tank 3, the precipitated solid matter settles as it is and moves to the first sludge storage tank 3. Since the bottom part 2a of the solid-liquid separation tank 2 has a hopper shape, it has a structure that facilitates accumulation of precipitated sludge.

A connection port 5 between the first sludge storage tank 3 and the second sludge storage tank 4 is disposed below the communication portion between the solid-liquid separation tank 2 and the first sludge storage tank 3. Since the transfer pump 6 for transferring the internal liquid to the first sludge storage tank 3 is arranged and the transfer pump 6 is operated, the first is below the communication portion between the solid-liquid separation tank 2 and the first sludge storage tank 3. The water flow which flows from the sludge storage tank 3 to the 2nd sludge storage part 4 via the connection port 5 has arisen, and the solid substance which moved to the bottom part of the 1st sludge storage tank 3 gets on the water flow, and stores 2nd sludge. It is divided into what is transferred to the tank 4 and what remains in the first sludge storage tank 3.
The solids transferred to the second sludge storage tank 4 repeatedly collide with the bubbles while riding on the stirring flow generated by the bubbles from the air diffuser 7 arranged at the bottom of the second sludge storage tank 4, and gradually. Becomes smaller. The reduced solid matter is stored while receiving the aerobic digestion action by the oxygen supply from the air diffuser 7 together with the sludge stored in the liquid in the tank, and becomes finer sludge. A part of the sludge is transferred to the first sludge storage tank 3 by the transfer pump 6 while riding the stirring flow in the tank.

  It is necessary to pay attention to the installation of the transfer pump 6 so that the suction port or the pipeline is not easily blocked by the solid matter. The larger the solid matter, the closer to the bottom, the more the water depth of the second sludge storage tank 4 (at least a half of the water depth when the flow control unit is provided on the upper side). It is desirable to arrange the suction port of the transfer pump 6 at a height of 2 mm, and if it is arranged at a height of two-thirds or more with respect to the water depth, the effect of suppressing the blockage of the suction port or the pipeline is further enhanced.

Further, the solid matter remaining in the first sludge storage tank 3 is directly under the bottom opening of the solid-liquid separation tank 2 due to the water flow from the first sludge storage tank 3 to the second sludge storage tank 4 via the connection port 5. It is reduced while being subjected to aerobic digestion by the oxygen supply from the air diffuser 8 installed at the bottom of the first sludge storage tank 3 together with the liquid in the tank of the first sludge storage tank 3, It is stored while riding on the stirring flow generated by the bubbles from the air diffuser 8 and becomes finer sludge. Some of these sludges are transferred to the second sludge storage tank 4 by the water flow from the first sludge storage tank 3 to the second sludge storage tank 4 through the connection port 5.
Solid matter precipitated and separated from the solid-liquid separation tank 2 may be transferred to the second sludge storage tank 4 or remaining in the first sludge storage tank 3, in either case, collision with air bubbles and aerobic digestion. While continuously receiving the action, it becomes finer and is stored while repeating advection from the first sludge storage tank 3 to the second sludge storage tank 4 and from the second sludge storage tank 4 to the first sludge storage tank 3.

  As described above, in the water treatment apparatus 1, in the case where the sludge containing large solids such as toilet paper is transferred using the transfer pump 6 to a portion where the sludge is stored by aerobic digestion, the above structure is used. Since the solid matter that has become fine due to the collision with bubbles can be transferred, clogging of the suction port or the pipe of the transfer pump 6 can be suppressed, and a predetermined sludge storage capacity can be exhibited. Can do.

FIG. 2 shows a water treatment device 21 according to a second embodiment of the present invention.
In the water treatment device 21 of the second embodiment shown in FIG. 2, the same components as those of the water treatment device 1 of the previous first embodiment are denoted by the same reference numerals, and description of the same elements is omitted.
The second embodiment is different from the first embodiment in that the liquid in the tank of the first sludge storage tank 3 can be transferred to the second sludge storage tank 4 by the transfer pump 6B. Therefore, the solid substance precipitated and separated in the solid-liquid separation tank 2 rides on the water flow flowing from the second sludge storage tank 4 to the first sludge storage tank 3 via the connection port 5, and the stirring flow of the first sludge storage section 3. Will ride. A water flow directed downward from the bottom of the solid-liquid separation tank 2 generates a flow directed to the first sludge storage tank 3 side. The aerobic digestion action by the bubbles generated by the air diffusers 7 and 8 and the action effect of the stirring flow can be obtained in the same manner as in the previous embodiment.
In the water treatment device 21 of the second embodiment, as in the water treatment device 1 of the previous first embodiment, the solid matter is reduced by collision with bubbles, and is transferred to the second sludge storage tank 4 by the transfer pump 6B. Thus, the first sludge storage tank 3 and the second sludge storage tank 4 are repeatedly subjected to processing while being stored.

  FIG. 3 shows a water treatment device 31 of a third embodiment according to the present invention, and FIG. 4 shows a water treatment device 41 of a fourth embodiment according to the present invention. The water treatment apparatus 31 of the third embodiment is characterized in that a transfer pump 6 is provided on the upper side of the second sludge storage tank 4 and a filter 11 is provided below the suction port of the transfer pump 6. The water treatment apparatus 41 of the fourth embodiment is characterized in that a transfer pump 6B is provided on the upper side of the first sludge storage tank 3. Since the other structure is the same as that of the water treatment apparatus of the first embodiment or the second embodiment described above, the same elements are denoted by the same reference numerals and the description of the same elements is omitted.

In each of the structures of the third and fourth embodiments, the filter 11 is disposed below the suction port of the transfer pump 6 or the transfer pump 6B. Since it reaches the mouth and the collision with the filter 11 due to the stirring flow repeatedly occurs, it is possible to reduce the solids more efficiently and further suppress clogging of the transfer pumps 6 and 6B.
With respect to other operational effects, the third embodiment can obtain the same operational effects as the first embodiment, and the fourth embodiment can obtain the same operational effects as the second embodiment.

FIG. 5 shows an embodiment of the sewage septic tank when the water treatment apparatus according to the third embodiment of the present invention is incorporated in the sewage septic tank.
The sewage purification tank 12 of the present embodiment has a first solid-liquid separation tank 13, a first sludge storage tank 14, and a second sludge storage tank 15 inside a tank structure constituted by a peripheral wall 12 </ b> A, a bottom wall 12 </ b> B, and a ceiling wall 12 </ b> C. , An anaerobic treatment tank 16, an aerobic treatment tank 17, a second solid-liquid separation tank 18, and a disinfection tank 19.
In the sewage septic tank 12, an inlet 20 is formed at one end on the inlet side, and an outlet 36 is formed at one end on the outlet side, and partition walls 16A, 17A, and 18A are formed sequentially spaced from the inlet 20 side to the outlet 36 side. The anaerobic treatment tank 16 is formed between the partition walls 16A and 17A, and the aerobic treatment tank 17 is formed between the partition walls 17A and 18A. In the sewage septic tank 12, a first solid-liquid separation tank 13 is formed on the center side of a region surrounded by the peripheral wall 12A on the inlet side and the partition wall 16A, and a first sludge storage tank 14 and a second sludge storage tank are formed on both sides thereof. 15 is formed.

The first solid-liquid separation tank 13 and the first sludge storage tank 14 are partitioned by a partition wall 13A, and the first solid-liquid separation tank 13 and the second sludge storage tank 15 are partitioned by a partition wall 15A. The first solid-liquid separation tank 13 is formed in a hopper shape having a bottom wall 13B constricted at the bottom 13a, and the bottom 13a communicates with the bottom 14a of the first sludge storage tank 14, A connecting port 21 for communicating the first sludge storage tank 14 and the second sludge storage tank 15 is provided below the bottom opening of the liquid separation tank 13. The connection port 21 is equivalent to the connection port 5 provided in the first and third embodiments.
Moreover, the transfer pump 25 which transfers the liquid in the tank of the 2nd sludge storage tank 15 to the 1st sludge storage tank 14 is arrange | positioned at the upper part side of the 2nd sludge storage tank 15, and the 1st sludge storage tank 14 and the 2nd Air diffusers 22 and 23 are provided at the bottom of the sludge storage tank 15. In this embodiment, a connection port 21 is provided at the bottom of a partition wall 15A that partitions the first solid-liquid separation tank 13 and the second sludge storage tank 15, and in this embodiment, the height is almost the same as the lowest position of the connection port 21. The air diffusers 22 and 23 are disposed in the front.

  An inflow part 20 constituted by a pipe passing through the upper part of the first sludge storage tank 14 and reaching the upper part of the solid-liquid separation tank is formed, and the water to be treated is passed through the inflow part 20 in the first solid-liquid separation tank 13. It has a structure that flows into the interior. In this example, the front end portion 20a of the inflow portion 20 is disposed downward along a partition wall that partitions the first solid-liquid separation tank 13 and the first sludge storage tank 14, and sewage is separated from the front end portion 20a by the first solid-liquid separation. It can be supplied to the inside of the tank 13. In the first solid-liquid separation tank 13, a partition wall 10 </ b> A is provided at a position near the peripheral wall on the side facing the installation position of the distal end portion 20 a to form the outflow portion 10. A discharge port 10 a is formed near the upper portion of the outflow portion 10 in the partition wall 16 </ b> A.

  Hereinafter, it demonstrates along the flow of water. First, sewage flows into the first solid-liquid separation tank 13 through the inlet 20. In the first solid-liquid separation tank 13, the solid matter in the sewage is separated by the precipitation separation action. The separated solid matter is sent to the first sludge storage tank 14 from the communicating portion at the bottom. The bottom of the first solid-liquid separation tank 13 has a hopper shape, and has a structure in which the separated solid matter is easily collected.

The solid material sent to the first sludge storage tank 14 is transferred to the second sludge storage tank 15 by the water flow from the first sludge storage tank 14 to the second sludge storage tank 15 through the connection port 21. The first sludge storage tank 14 is divided into those remaining.
The solid matter transferred to the second sludge storage tank 15 rides on the stirring flow generated by the air bubbles supplied from the air diffuser 22 installed at the bottom, collides with the air bubbles, and is filled with the mesh-like cylindrical filter medium. (Filter) It gradually decreases while colliding with 24. Thus, the solid substance transferred to the second sludge storage tank 15 is stored while receiving aerobic digestion by being bubble-stirred in the tank. The second sludge storage tank 15 is provided with a suction port of a transfer pump 25 above the filter bed 24, and solid matter (sludge) that has passed through the filter bed 24 is located above the first sludge storage tank 14. Is transferred by the transfer pump 25 and stored in the first sludge storage tank 14 under aerobic digestion.

The solid matter remaining in the first sludge storage tank 14 is flown from the first sludge storage tank 14 to the second sludge storage tank 15 via the connection port 21, and the first solid-liquid separation tank 13 and the first sludge storage section. It is extruded from directly below the 14 communication openings. The extruded solid matter rides on the stirring flow generated by the air bubbles supplied from the diffuser pipe 23 installed at the bottom, collides with the air bubbles, and is filled with a net-like cylindrical filter medium having a low trapping property (filter) 26. It gradually gets smaller while colliding with
Thus, the solid substance transferred to the first sludge storage tank 14 is stored while undergoing bubble agitation in the tank and receiving an aerobic digestion action. It rides the water flow from the first sludge storage tank 14 to the second sludge storage tank 15, is transferred to the second sludge storage tank 15, and is subjected to aerobic digestion in the second sludge storage tank 15 and stored. The solids transferred from the first solid-liquid separation tank 13 eventually become fine sludge, from the first sludge storage tank 14 to the second sludge storage tank 15, and from the second sludge storage tank 15 to the first sludge storage tank. 14 is repeatedly stored in the sludge storage tanks 14 and 15 under aerobic digestion.

In the present embodiment, the filter bed 26 of the first sludge storage tank 14 and the filter bed 24 of the second sludge storage tank 15 are illustrated as being filled with a net-like cylindrical filter medium. It is also possible to fill a filter medium, a skeleton-like spherical filter medium, and the like, and it is also possible to arrange a grid-like net.
In each of the sludge storage tanks 14, 15, as the processing proceeds, the sludge concentration increases, so that the sludge interface of the first solid-liquid separation tank 13 that is in communication rises. Since the sludge is drawn by the water flow from the sludge storage tank 14 to the second sludge storage tank 15, the rise of the sludge interface can be suppressed.

  On the other hand, the sewage from which the solid matter has been removed in the first solid-liquid separation tank 13 is transferred from the outflow portion 10 to the anaerobic treatment tank 16 as shown by the arrow in FIG. The anaerobic treatment tank 16 has a filter bed 27 and is filled with a skeleton-like spherical filter medium having a high trapping property. SS (floating matter) in the sewage is captured by the filter bed 27, and the organic matter is anaerobically treated. A part of the anaerobic treatment tank 16 is formed with an outflow passage 16a passing through the side of the filter bed 27 and extending to the upper portion of the anaerobic treatment tank 16, and a sludge transfer pump 28 is installed at the bottom of the outflow passage 16a. A transfer pump 29 is installed at the top. The sludge transfer pump 28 is connected to the upper side of the first solid-liquid separation tank 13, and the transfer pump 28 is connected to the upper side of the aerobic treatment tank 17.

The deposited sludge below the filter bed is transferred to the first solid-liquid separation tank 13 by the sludge transfer pump 28 in the anaerobic processing tank 16 and is again processed.
In this embodiment, the filter bed 27 of the anaerobic treatment tank 16 is filled with the skeleton-like spherical filter medium, but it can also be filled with a net-like cylindrical filter medium, a loofah-like plate filter medium, or the like.
As a space to be stored when there is a peak inflow such as bathtub drainage, a flow rate adjusting unit is provided above the first solid-liquid separation tank 13, the first sludge storage tank 14, the second sludge storage tank 15, and the anaerobic treatment tank 16. 37 is provided. The sewage subjected to the anaerobic treatment in the anaerobic treatment tank 16 is transferred to the aerobic treatment tank 17 by the flow rate adjusting pump 29. By adjusting the amount of sewage transferred by the flow rate adjusting pump 29, the amount of sewage stored in the first solid-liquid separation tank 13, the first sludge storage tank 14, and the second sludge storage tank 15 is shown in FIG. L.). W. From L (low water level) to H. W. Sewage treatment can be performed while adjusting during L (high water level).

The aerobic treatment tank 17 has a filter bed 30 and is filled with a granular carrier. The carrier flows while being supplied with oxygen by an air diffuser 31B installed at the bottom of the filter bed 30, and aerobic treatment of sewage is performed by microorganisms attached to the carrier. The aerobic treated sewage is transferred to the second solid-liquid separation tank 18.
Here, as this embodiment, a carrier flow system in which the filter bed 30 of the aerobic treatment tank 17 is filled with a granular carrier is adopted. However, a corrugated filter medium, a loofah-like plate filter medium, a skeleton-like spherical filter medium, etc. It is also possible to adopt a contact aeration method filled with, or a biofiltration method in which a granular carrier is filled and the aeration liquid is passed through a filter bed without direct aeration so that the carrier does not flow. . A part of the aerobic treatment tank 17 is formed with an outflow path 17a that passes through the side of the filter bed 30 and extends to the upper part of the aerobic treatment tank 17 and reaches the vicinity of the second solid-liquid separation tank 18 described later. A transfer pump 32 connected to the first solid-liquid separation tank 13 is installed at the bottom of the outflow passage 17a. An outflow port 17b is formed on the upper side of the outflow path 17a, and the aerobically treated sewage flows out from the outflow port 17b to the second solid-liquid separation tank 18.
A part of the aerobic treated sewage is transferred to the first solid-liquid separation tank 13 by the transfer pump 32 of the aerobic processing tank 17 and is again processed.

On the downstream side of the aerobic treatment tank 17, the second solid-liquid separation tank 18 is surrounded by the peripheral wall 12A of the sewage purification tank 12, the partition wall 18A, the partition wall 18B extending perpendicularly to the partition wall 18A, and the bottom wall 18C. A disinfection tank 19 is formed.
The second solid-liquid separation tank 18 has a filter bed 33 and is filled with a granular carrier. The SS contained in the sewage transferred from the aerobic treatment tank 17 is captured by the filter bed 33 and separated into solid and liquid. A part of the second solid-liquid separation tank 18 is formed with an outflow path 18 a that passes from the bottom of the second solid-liquid separation tank 18 to the top of the second solid-liquid separation tank 18 through the side of the filter bed 33. A transfer pump 34 connected to the upper side of the liquid separation tank 13 is installed.

The SS trapped in the filter bed 33 is transferred to the first solid-liquid separation tank 13 by the transfer pump 34 as cleaning wastewater by periodic cleaning of the filter bed 33, and is subjected to processing again. Washing is performed by drawing out sewage from the transfer pump 34 simultaneously with rocking of the carrier by bubbles from the air diffusion pipe 35 installed below the filter bed 33.
In this example, the biological filtration method is adopted by filling the filter bed 33 of the second solid-liquid separation tank 18 with a granular carrier, but the filter medium is not filled, but a precipitation tank can be used. In that case, it is necessary to provide time required for sufficient precipitation separation.
The treated water transferred from the second solid-liquid separation tank 18 is transferred to the disinfection tank 19 from a discharge port 18b formed in the upper part of the partition wall 18B, sterilized, and then discharged out of the system from the outlet 36. .

FIG. 6 is a graph showing the transfer capability of the transfer pump 25 provided in the second sludge storage tank 15 in the embodiment in which the water treatment apparatus based on this embodiment shown in FIG.
The transfer pump 25 is an air lift pump, and the upper part of the first solid-liquid separation tank 13, the first sludge storage tank 14, the second sludge storage tank 15, and the anaerobic treatment tank 16 is a flow rate adjustment unit 37, The amount of transferred water is affected by the water level fluctuation (LWL to HWL) of the flow rate adjusting unit 37.

  As a result of using the air lift pump having the transfer characteristics shown in FIG. 6 as the transfer pump 25, the transfer pump 25 does not clog over the period from the start of use to cleaning, and exhibits a predetermined sludge storage capacity. I was able to.

  DESCRIPTION OF SYMBOLS 1 ... Water treatment apparatus, 1A ... Perimeter wall, 1B ... Bottom wall, 2 ... Solid-liquid separation tank, 2A ... Partition wall, 2a ... Bottom part, 2B ... Bottom wall, 3 ... First sludge storage tank, 3a ... Bottom part, 4 ... 2nd sludge storage tank, 5 ... connecting port, 6 ... transfer pump, 7 ... air diffuser, 8 ... air diffuser, 9 ... inflow part, 10 ... outflow part, 10a ... outlet, 11 ... filter, 12 ... sewage Septic tank, 12A ... peripheral wall, 12B ... bottom wall, 13 ... first solid-liquid separation tank, 13B ... bottom wall, 14 ... first sludge storage tank, 15 ... second sludge storage tank, 16 ... anaerobic treatment tank, 16A ... partition Wall, 17 ... Aerobic treatment tank, 17A ... Partition wall, 18 ... Second solid-liquid separation tank, 18A, 18B, 18C ... Partition wall, 19 ... Disinfection tank, 20 ... Inlet, 21 ... Connection port, 22 ... Spatter Gas device, 23 ... diffuser, 24 ... filter bed (filter), 25 ... transfer pump, 26 ... filter bed (filter), 27 ... filter bed, DESCRIPTION OF SYMBOLS 8 ... Sludge transfer pump, 29 ... Flow control pump, 30 ... Filter bed, 31B ... Air diffuser, 32 ... Transfer pump, 33 ... Filter bed, 34 ... Transfer pump, 35 ... Air diffuser, 36 ... Outflow part, 37 ... Flow rate adjustment unit.

Claims (7)

  It has a solid-liquid separation tank that separates solids from the water to be treated including sludge, a two-part sludge storage tank that consists of a first sludge storage tank and a second sludge storage tank that store sludge separated in the solid-liquid separation tank. In the water treatment device, the first sludge storage tank communicates with the bottom of the solid-liquid separation tank, the first sludge storage tank and the second sludge storage tank are connected at a connection port, and the connection port is Arranged below the communication opening of the first sludge storage tank and the solid-liquid separation tank, each of the first sludge storage tank and the second sludge storage tank has an air diffuser and the liquid in the tank of the second sludge storage tank The water treatment apparatus which has arrange | positioned the transfer pump which transfers this to said 1st sludge storage tank.   It has a solid-liquid separation tank that separates solids from the water to be treated including sludge, a two-part sludge storage tank that consists of a first sludge storage tank and a second sludge storage tank that store sludge separated in the solid-liquid separation tank. In the water treatment device, the first sludge storage tank communicates with the bottom of the solid-liquid separation tank, the first sludge storage tank and the second sludge storage tank are connected at a connection port, and the connection port is Arranged below the communication opening of the first sludge storage tank and the solid-liquid separation tank, each of the first sludge storage tank and the second sludge storage tank has an air diffuser and the liquid in the tank of the first sludge storage tank The water treatment apparatus which has arrange | positioned the transfer pump which transfers to a said 2nd sludge storage tank.   The water treatment device according to claim 1, wherein a filter is disposed below the suction port of a transfer pump that transfers the liquid in the second sludge storage tank to the first sludge storage tank.   3. The water treatment apparatus according to claim 2, wherein a filter is disposed below the suction port of a transfer pump that transfers the liquid in the tank of the first sludge storage tank to the second sludge storage tank.   A water treatment device according to any one of claims 1 to 4, an anaerobic treatment tank, an aerobic treatment tank, and a disinfection tank connected to an outlet formed in a solid-liquid separation tank of the water treatment apparatus. Sewage septic tank provided.   The sewage purification tank according to claim 5, wherein a second solid-liquid separation tank is provided between the aerobic treatment tank and the disinfection tank.   Each of the anaerobic treatment tank, the aerobic treatment tank, and the second solid-liquid separation tank is provided with a transfer pump that returns a part of the sewage treated in each tank to the solid-liquid separation tank of the water treatment device. The sewage septic tank according to claim 6.

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