JP2001347283A - Drain soil treatment unit and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple drain soil treatment unit and apparatus constituted so that sludge or a slime-like microorganism film are hardly accumulated on or adhered to the wall of a treatment space 1 or the filter medium 3 in the treatment space 1, and capable of easily cleaning the treatment space or filter medium 3 and discharging the sludge. SOLUTION: A simple or a plurality of drain soil treatment unit 2 are arranged in the vertical hole excavated in soil in such a state that filter media 3 and pipings are unified and the pipings of the respective units 2 are connected to execute a drain soil treatment apparatus. An air diffusing/water sucking pipe 4 is provided in the vicinity of the bottom part of each drain soil treatment unit 2 and air is sent to the air diffusing/water sucking pipe 4 not only to diffuse air but also to discharge water in the treatment space 1 to the outside from the air diffusing/water sucking pipe 4. By this constitution, the treatment space 1 is washed at a proper time and sludge can be discharged. A ventilation cylinder 9 is raised from a water sprinkling pipe 5 to accelerate the ventilation in the treatment space 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus for purifying wastewater which has been purified to a certain extent, further permeating the soil, and partially evaporating the wastewater, and a unit for constituting the same. In particular, the present invention relates to a drainage soil treatment apparatus having a washing function capable of cleaning a biofilm deposited on a filter medium and a soil infiltration surface in a timely manner and discharging the biofilm from the system, thereby maintaining the function.

[0002]

2. Description of the Related Art Conventionally, as a means for infiltrating and treating water with soil, there are rainwater storage and infiltration facilities by a water spreading method, and evaporative diffusion and infiltration facilities of treated water by a septic tank for domestic wastewater. Trench method using a solid filter medium such as That is, in these apparatuses, a trench is filled with a filter medium made of quarry, rainwater and drainage are guided into the trench, and water is permeated into the soil from around the trench while being purified by the filter medium, and treated. . Some conventional drainage soil treatment apparatuses are provided with a pit management function such as a sand setting function in a flow rate control pit or a filter attached to an inlet pipe.

[0003]

In such a conventional drainage soil treatment apparatus, ventilation in the trench is performed by utilizing the capillary action of the soil covering the trench, so that ventilation in the apparatus is smooth. Hard to do. For this reason, the inside of the trench becomes anaerobic, a slime-like biofilm is formed on the filter medium and the contact soil, and the fine gaps in the soil for forming capillaries are blocked, which causes a diary.

Further, sludge in the drainage sent out from the water sprinkling pipe into the trench is settled and deposited in the filter medium and the trench, closing the gap between the soil particles, and paralyzing the water purification and permeation functions. In the conventional drainage soil treatment apparatus, it is possible to manage the cleaning of the inflow basin and the water sprinkling pipe, but it is almost impossible to maintain and manage the entire apparatus because there is no function of cleaning the filter medium or the trench and discharging the sludge.

[0005] Further, in the conventional drainage soil treatment apparatus using crushed stone as a filter material, the porosity in the trench is low, so that the drainage storage capacity and retention capacity are low. For this reason, a large installation area is required. In addition, since the construction work is complicated and troublesome, there is a problem that the construction cost is high.

The present invention has been made in view of such problems in the conventional drainage soil treatment apparatus, and is simple to construct. Sludge accumulates on the wall surface of the treatment space and the filter medium in the treatment space, and the slime-like microorganism film adheres. A wastewater treatment system that can be easily cleaned and discharged even if sludge containing a slime-like biofilm or its dead body accumulates in the treatment space or in the filter medium, and a unit suitable for constructing it. The purpose is to provide.

[0007]

According to the present invention, in order to achieve the above object, a filter medium 3 and piping are unitized, and one or more drainage soil treatment units 2 are installed in a vertical hole excavated in the soil. By simply connecting the piping of each unit 2, the drainage soil treatment device can be easily installed. An air diffuser / water absorption pipe 4 is provided near the bottom of the drainage soil treatment unit 2 and air is supplied to the air diffuser / water intake pipe 4 so that air can be diffused. Drain to the outside. Thereby, it is possible to clean the inside of the processing space 1 at an appropriate time and discharge sludge. Further, the ventilation tube 9 is started up from the sprinkling pipe 5 to promote the ventilation in the processing space 1.

That is, the drainage soil treatment unit according to the present invention comprises a container 21 having water permeability and three sets of water passages, each having a hollow ball shape and opposed to each other in three directions orthogonal to each other with the center interposed therebetween. A ball-shaped filter medium 3 housed in the cage 21 so that a pair of opposed water passage holes 23 face up and down, and a pipe is provided so as to penetrate near the bottom of the cage 21; The air diffusion / water absorption pipe 4 and the air diffusion / water absorption hole 16 formed in the peripheral wall of the air diffusion / water absorption pipe 4.

An appropriate number of such wastewater treatment units 2 are prepared according to the scale of wastewater treatment, and the wastewater treatment units 2 are buried in a treatment space 1 provided in the soil. The air diffuser / water intake pipes 4 of the adjacent drainage soil treatment unit 2 are sequentially connected at both ends thereof.
The drainage soil treatment apparatus according to the present invention is constructed by laying a water sprinkler pipe 5 having a water sprinkling hole 18 in the peripheral wall above the plurality of drainage soil treatment units 2 connected to the water suction pipe 4.

[0010] For example, the water sprinkling pipe 5 supplies drainage from a drainage source side through a flow rate adjusting tub 7. The air supply / drainage pipe 6 is drawn into the bottom side of the drainage soil treatment unit 2 from the flow rate adjusting tub 7 and connected to the air diffusion / water absorption pipe 4. In addition, a ventilation tube 9 that rises above the ground is installed in the sprinkler pipe 5 to promote ventilation.

Since such a drainage soil treatment apparatus is constructed using the unitized wastewater treatment unit 2, the construction can be standardized and the construction can be simplified. Further, when air is pressure-fed from a blower, a compressor, or the like to an air diffusing / water absorbing pipe 4 piped near the bottom of the processing space 1 through an air feeding / drain pipe 6 piped from a position near the ground, the air is discharged into the processing space. 1, the sludge and wastewater in the apparatus are made turbid, and the filter medium 3 and the processing space 1 are washed. Here, the air diffusion / water absorption hole 16 of the air diffusion / water absorption pipe 4
Are spirally arranged on the peripheral wall over the longitudinal direction of the air diffuser / water suction pipe 4, a spiral flow is generated in the processing space 1 due to the water pressure of the air diffusion, and a turbulent water flow is generated in the processing space 1. The filter medium 3 and the like in the space 1 can be efficiently cleaned.

Thereafter, the inside of the treatment space 1 is turned into turbid water, and the filter medium 3 and the like inside the treatment space 1 are washed. After that, a drainage pump installed on the ground is connected to the air / drain pipe 6 to remove the turbid water from the outside of the treatment space 1. To remove sludge. By using the air diffusing / absorbing pipe 4 together as a water absorbing pipe, the air diffusing / absorbing pipe 4 is arranged in a spiral.
When the drainage pump strongly drains the water, since the water absorption hole 16 serves as a water absorption port, water is absorbed from the entire peripheral surface of the diffuser / water absorption pipe 4, resulting in side-surface irregular flow water absorption at regular intervals. As a result, a spiral spiral flow is generated in the aeration / water absorption pipe 4, the suction power of the muddy sludge and the washing water is increased, and the sludge is removed. Thus, the filter medium 3 and the like in the processing space 1 are cleaned, and the initial function as the drainage soil treatment device can be recovered and maintained.

Further, a ventilation tube 9 which rises to the ground from the water sprinkling pipe 5 piped above the processing space 1 is erected on the water sprinkling pipe 5 to promote ventilation, so that the inside of the processing space 1 is exposed to an aerobic environment. Can be placed. Thereby, the processing space 1
The generation and propagation of anaerobic bacteria that promote spoilage in
It is possible to prevent the generation of a so-called slime-like biofilm.

[0014]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings.
First, the cage 21 constituting the unit 2 for installing the drainage soil treatment device will be described with reference to FIG.

The cage 21 shown in the figure is formed of a metal wire such as steel or stainless steel or a thin rod made of synthetic resin.
It is formed in a cubic basket shape. For example, FIG.
(A) and (B) have a vertical height of 800 mm, and FIG.
The length in the left-right direction of (A) is 500 mm, and the width in the left-right direction of FIG. 5B is 400 mm.

An air diffusion / water absorption pipe 4 is installed along the longitudinal direction at the center of the second frame from the bottom of the cage 21 in the left and right width directions shown in FIG. 5B. The air diffusing / water absorbing pipe 4 is made of, for example, a plastic pipe or the like.
15. A diffuser / water-absorbing hole 16 is formed between the male and female joints 14 and 15. The air diffusing / water absorbing holes 15 are pierced in a spiral arrangement over the longitudinal direction of the air diffusing / water absorbing pipe 4.

The cage 21 is filled with a hollow ball-shaped filter medium 3. As shown in FIGS. 7 and 8, the filter medium 3 is formed of a hollow body having an elliptical sphere. For example, high-density polyethylene waste such as an empty PET bottle is recycled and blow-molded to form a hollow elliptical ball. Mold. A total of six water holes are provided at two locations where the wall surface of this hollow elliptical ball intersects the major axis of the ellipsoidal sphere, and at four locations where the wall surface intersects two orthogonal minor axes of the elliptical sphere. 23. In addition, the filter medium 3 may be, for example, a spherical hollow body other than such an elliptical hollow body.

In the filter medium 3 as described above, a pair of water passage holes 23 opposed in one short axis direction are set up and down, and the other water passage holes 23 in the short axis direction and the long axis direction are oriented in the horizontal direction. The cage 21 is filled in this state. In order to maintain such a posture of the filter medium 3, as shown in FIG. 1 and FIG. 2, the filter medium 3 is put in a mesh-shaped bag 22 in advance to adjust the posture, and then filled in the cage 21.

Next, a procedure for installing the drainage soil treatment apparatus using the unit 2 composed of the cage 21 filled with the filter medium 3 will be described. First, a vertical hole is excavated at the installation location of the drainage soil treatment device. Next, as shown in FIG. 1, the unit 2 including the cage 21 filled with the filter medium 3 as described above is installed in the vertical hole. The cages 21 are installed while being sequentially arranged along the extension direction of the air diffusion / water absorption pipes 4, and the air diffusion / water absorption pipes 4 are connected to the male and female joints 14, 15 at both ends thereof shown in FIG. To connect sequentially. Thereby, as shown in FIG. 1, the diffuser / water-absorbing pipe 4 becomes a series of diffused water-absorbent pipes.

As shown in FIG. 1, a flow control box 7 is installed near a vertical hole in which the unit 2 is installed.
, An air supply / drainage pipe 6 is laid near the unit 2 and connected to one end of the air diffusion / water absorption pipe 4 via a joint 13. Further, the other end of the diffusing / water absorbing pipe 4 is connected to the detecting pipe 12 via an elbow joint 15, and the detecting pipe 12 is raised near a vertical hole where the unit 2 is installed, and the upper end thereof is above the ground. Position.

A plurality of units 2 from the flow rate adjusting box 7
And a water sprinkling pipe 5 is piped on the upper part thereof. The sprinkler pipe 5 has a sprinkler hole 18 formed in the peripheral wall. An elbow pipe 11 is connected to an end of the water sprinkling pipe 5 on the flow control film 7 side, and a tip of the elbow pipe 11 is arranged downward. The sprinkler pipe 18 has a very gentle gradient that decreases from the end on the flow rate adjusting film 7 side to the other end, and the other end is closed with a cap.

The vent pipe 9 is set up at an appropriate position of the sprinkler pipe 18. The illustrated ventilation pipe 9 is a filter medium 3 of the sprinkling pipe 18.
Is provided almost at the intermediate position of the section passing through the space between the two, but when the connection length of the unit 2 is long, a plurality of places are provided. As shown in FIGS. 4 and 5, the ventilation pipe 9 is branched from the water sprinkling pipe 5 by a cheese joint to raise the rising pipe 19, and further, in order to eliminate the load on the water sprinkling pipe 5, the rising pipe 19 An insertion pipe 24 having a larger pipe diameter is slidably inserted from above to form an indirect pipe. In addition, a flanged socket 17 is fixed about halfway between the insertion pipes 24 to prevent settlement. The cap 10 is fitted on the uppermost part of the insertion tube 24, a plurality of ventilation holes 20 are formed in the upper end wall of the cap 19, and a fine mesh for preventing the inflow of dust is provided on the inner surface. The filter medium 3 through the water pipe 3 through the vent hole 20
Ventilate the space filled with.

As shown in FIG. 1, an inflow pipe 8 connected to the drainage source side is connected to the flow rate adjusting tub 7, and drainage is sent to the flow rate adjusting tub 7 from the drainage source side. When the drainage that has flowed into the flow control basin 7 reaches the water level of the sprinkler pipe 5, it flows into the sprinkler pipe 5 from the elbow pipe 11, is sent to the filter medium 3 side through the sprinkler pipe 5, and passes through the sprinkler hole 18 onto the filter medium 3. Sprinkled on Since the top of the filter medium 3 is covered and covered, the excavated pit becomes a closed space containing the filter medium 3 as the processing space 1.

In such a drainage soil treatment apparatus, the wastewater is sent from the flow rate adjusting tub 7 to the treatment space 1 by the water sprinkling pipe 5, and is evenly sprinkled on the filter medium 3 from the water sprinkling hole 18 of the water sprinkling pipe 5. Since the filter medium 3 is a hollow elliptical ball having water holes 18, the porosity in the processing space 1 reaches 95%, which is about 4 times that of a solid filter medium such as crushed stone.
It has twice as many gaps and is unlikely to cause clogging of the filter medium alone.

In the process where the liquid level of the sprinkled wastewater rises from the lower part of the processing space 1, the wastewater flows into the filter medium 3 from the water passage holes 23 of the filter medium 3. Then, the air in the filter medium 1 is compressed by the water pressure, the exhaust force is increased, and the air in the filter medium 3 is exhausted from the uppermost water passage hole 23 of the filter medium 1. Filter media 3
Is exhausted from the processing space 1, enters the water sprinkling pipe 5 from the water sprinkling hole 18 of the water sprinkling pipe 5, is further guided to the ventilation pipe 9, and is exhausted from the ventilation pipe 9 to the ground.

The wastewater in the treatment space 1 is infiltrated by capillary action of the surrounding soil, partly evaporates from the ground surface, and partly penetrates underground. As a result, in the process of lowering the water level in the processing space 1, the inside of the processing space 1 becomes negative pressure, and fresh outside air is sucked from the surface of the ground through the ventilation tube 9 into the water sprinkling pipe 5, and the processing is further performed by lowering the water level. Air is sucked into the space 1. In this way, the air in the processing space 1 is exchanged due to the atmospheric pressure fluctuation due to the vertical action of the wastewater in the processing space, and the air is naturally aerated, and the inside of the processing space 1 becomes aerobic. As a result, the aerobic bacteria are activated, the self-cleaning action is activated, the organic matter contained in the wastewater is decomposed, the slime-like biofilm by the anaerobic bacteria is removed, and the clogging is hardly performed. By setting up the ventilation pipe 9 in the water sprinkling pipe 5, the ventilation of the entire processing space 1 is smoothly performed, and the purification function is improved.

However, when the sludge settles and accumulates in the filter medium 3 and the processing space 1 and the infiltration function is reduced, a blower or a compressor is connected to the air supply / drainage pipe 6 in the flow rate adjusting vessel 7 to diffuse air.・ Pressurized air is sent to the water intake pipe 4 to diffuse the air.
Air is diffused into the processing space 1 from the water absorption holes 16 to make the sludge and wastewater in the space 1 turbid, thereby washing the filter medium 3 and the wall surface of the processing space 1.

The air diffuser / water suction holes 4 of the air diffuser / water suction pipe 4 are provided spirally over the longitudinal direction of the air diffuser / water suction pipe 4. 4 is mainly diffused. For this reason, a spiral swirling flow is generated in the processing space 1, and the entire processing space 1 becomes a turbulent swirling flow. Thereby, the filter medium 3 and the wall surface of the processing space 1 can be efficiently cleaned.

The wastewater in the processing space 1 is turned into turbid water,
After the sludge on the wall of the treatment space 1 has been peeled off, a land-based drainage pump is connected to the air supply / drainage pipe 6 in the flow control basin 7,
Turbid water is pumped out of the treatment space 1, discharged, and sludge is removed. At this time, since the air diffusion / water absorption pipe 4 is a water absorption pipe, the spirally provided air diffusion / water absorption hole 16 becomes a water absorption hole. Water is absorbed from the peripheral surface of the water absorption pipe 4. At this time,
Spiral spiral flow is generated in the pipe due to side-surface irregular flow water absorption at regular intervals. Therefore, the suction power of the turbidized wastewater is increased, and the wastewater containing sludge can be efficiently pumped out and removed. By such washing and sludge removal, the filter medium 3 and the wall surface of the processing space 1 are cleaned, and the initial function can be maintained.

FIG. 6 is an overall view of an apparatus showing another embodiment according to the present invention. In a large-scale treatment apparatus having a large drainage treatment capacity, a drainage basin 12 ′ having a function as a detection pipe is installed at the end of the diffuser / water absorption pipe 4 instead of starting the detection pipe 12 as described above. Then, the diffusion / water absorption pipe 4 is capped. After washing the filter medium 3 and the inside of the processing space 1, the cap of the air diffuser / water absorption pipe 4 is removed, and wastewater containing sludge is introduced into the drainage basin 12 ', which is discharged by a submersible pump.
Remove sludge. At this time, since the terminal of the air diffuser / water suction pipe 4 is opened by sending air to the air diffuser / water suction pipe 4, the water supply and water pressing functions work while diffusing, and the turbid water is discharged without stagnation. The sludge can be removed.

[0031]

As described above, according to the present invention, since the unit can be constructed as a unit, the construction of the drainage soil treatment apparatus can be simplified. Further, since the porosity of the filter medium 3 is high and ventilation is performed smoothly, the wall of the processing space 1 and the filter
Sludge is not easily deposited on the slag, and the slime-like microbial membrane is not easily attached. In addition, by providing the air diffusion and drainage functions through the air diffusion / water absorption pipe 4, even if sludge including a slime-like biofilm or its dead body accumulates in the treatment space 1 or the filter medium 3, it can be easily removed in a timely manner. Can be cleaned and discharged.

[Brief description of the drawings]

FIG. 1 is a side view of a whole of a drainage soil treatment apparatus according to an embodiment of the present invention, which is longitudinally sectioned at a central portion except for a pipe and a filter medium.

FIG. 2 is a front view of the entire drainage soil treatment apparatus according to the embodiment of the present invention, in which only soil is vertically sectioned.

FIG. 3 is a side view and a front view of a cage including piping used in a drainage soil treatment unit according to an embodiment of the present invention.

FIG. 4 is a side view showing an attachment portion between a water sprinkling pipe and a ventilation tube used in the drainage soil treatment apparatus according to the embodiment of the present invention.

FIG. 5 is a plan view showing an attachment part of a water pipe and a ventilation tube used in the drainage soil treatment apparatus according to one embodiment of the present invention.

FIG. 6 is a side view of a whole of a drainage soil treatment apparatus according to another embodiment of the present invention, which is longitudinally sectioned at a central portion except for a pipe and a filter medium.

FIG. 7 is a longitudinal sectional front view showing a filter medium used in the drainage soil treatment apparatus according to each of the embodiments of the present invention.

FIG. 8 is a vertical sectional side view showing a filter medium used in the drainage soil treatment device according to each of the embodiments of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Treatment space 2 Drainage soil treatment unit 3 Filter material 4 Air diffusion / water absorption pipe 5 Water distribution pipe 7 Flow rate adjustment box 9 Ventilation cylinder 14 Joint of air diffusion / water absorption pipe 15 Joint of air diffusion / water absorption pipe 16 Air / water absorption hole 18 Watering hole of water pipe 21 Cage 23 Water hole of filter medium

Claims (6)

[Claims] 1. A unit constituting a wastewater treatment apparatus for purifying wastewater in soil, comprising a container-like cage (21) having water permeability and a hollow ball-like shape sandwiching the center. It has three sets of water holes (23) facing each other in three orthogonal directions, and is housed in the cage (21) so that one set of water holes (23) faces up and down. A ball-shaped filter medium (3), an air diffusing / water absorbing pipe (4) laid so as to penetrate near the bottom of the cage (21),
A drainage soil treatment unit comprising: an air diffusion / water absorption hole (16) formed in a peripheral wall of the air diffusion / water absorption pipe (4). 2. The air diffusion / water absorption hole (1) of the air diffusion / water absorption pipe (4).
The drainage soil treatment unit according to claim 1, wherein 6) is spirally arranged on a peripheral wall of the diffuser / water absorption pipe (4) over the longitudinal direction thereof. 3. A wastewater treatment apparatus for purifying wastewater in soil, comprising: a treatment space (1) provided in the soil;
A plurality of drainage soil treatment units (2) according to claim 1 or 2 are buried, and diffuser / water absorption pipes (4) of adjacent drainage soil treatment units (2) are sequentially connected at both ends thereof. Air supply from a location near the ground
A drain pipe (6) is connected to the air diffuser / absorber pipe (4), and over a plurality of drain soil treatment units (2),
A drainage soil treatment device comprising a water sprinkling pipe (5) having a water sprinkling hole (18) on a peripheral wall. 4. The drainage soil treatment apparatus according to claim 3, wherein the water sprinkling pipe (5) receives a supply of wastewater from a drainage source side via a flow rate adjusting basin (7). 5. An air supply / drainage pipe (6) is connected to a flow rate adjusting box (7).
The drainage soil treatment apparatus according to claim 4, wherein the drainage soil treatment unit (2) is drawn into the bottom side of the wastewater treatment unit (2) and connected to the diffuser / water absorption pipe (4). 6. The drainage water according to claim 3, wherein a ventilation tube 9 rising to the ground is erected on the water sprinkling pipe 5, and a ventilation hole 20 is opened at an upper end of the ventilation tube 9. Soil treatment equipment.