JPH10156112A - Sewage filtering and purifying device for fish breeding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to rapidly and easily clean filter media of a small thickness which allow the passage of sewage from the inside surface to the outside surface and are adhered with cake while these filter media are held mounted by providing this device with the filter media and a cake removing means for automatically and relatively rub the surfaces of the filter media and removing the cake adhered to the filter media by this cake removing means. SOLUTION: This device has the filter media 13 which are formed to a hollow cylindrical shape and are supported at both top and bottom ends to suppress its vertical movement by supporting rings 11, 12 and a scraper 14 which is inserted into the filter media 13 and is mounted with spiral vanes 14b at a revolving shaft 14a. The sewage is sent by pump P to the inflow port 15a of the sewage filter device 15 and is passed through the filter media 13 from the inside of the supporting ring 11 and the inside of the filter media 13 and, thereafter, the sewage is discharged via a valve A from an outflow port 15b, by which the sewage is purified. The cake adhered to the inside surface of the filter media 13 is scraped off by rotating a scraper 14 and is settled through the inside of the supporting ring 11 to the bottom of the sewage filter device 15. The settled cake is withdrawn by a valve B from a withdrawal port 15c disposed at its bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage filtration device for fish farming, which breeds fish farming and pretreats the sewage in order to purify the sewage soiled by the excrement of fish farming and remaining food. The present invention relates to a sewage purification device for fish farming used in combination with a device.

[0002]

2. Description of the Related Art FIG. 11 is a schematic vertical sectional view of an example of a conventionally used sewage purification apparatus for fish farming. In FIG. 11, the supply port 71 a of the sewage supply pipe 71 is located at the lower part of the tank container 72, and the floating filter material 73 is charged in the tank container 72. Sewage is withdrawn from the pond where fish farming is raised, and the supply port 71a
Supplied from Then, the sewage is filtered by a filter bed 74 formed by the floating filter material 73, and the solid solid contained in the sewage adheres to the filter bed 74 or precipitates and deposits on the bottom 72 a of the tank container 72. The filtered sewage is discharged into a discharge pipe 75
Overflows / outflows from the outlet 75a and is returned to the pond as treated water. The massive solid that has settled and deposited on the bottom portion 72a is discharged from the scrap removal port 76 as appropriate.

In FIG. 11, a gas discharge port 71b is provided on the opposite side of the supply port 71a of the sewage supply pipe 71 to release gas contained in sewage and easily released. In addition, aeration air is blown out from an air port 77 located at the lower part of the tank container 72 to supply oxygen to the aerobic bacteria attached to the filter bed 74, and the aerobic bacteria biologically treats wastewater. One or more tanks 72 are used.

However, in the above-described sewage purification apparatus for fish culture, the sewage purification efficiency decreases as the sewage treatment time increases, and the sewage purification efficiency does not increase much even if the operation rate of the purification apparatus is increased. In other words, the load of the conventional sewage purification apparatus for fish farming tends to increase very much. Therefore, it is necessary to clean the inside of each tank of the sewage purification apparatus for fish farming to reduce the load on the purification apparatus and increase the purification efficiency.

[0005] However, the cleaning of each tank in the above-mentioned conventional fish farm sewage purification apparatus is performed over a long period of time by stopping the flow of sewage into each tank. The frequency of cleaning is also high. For example, the frequency of the cleaning in the fish sewage purification device is 50
When treated with liters / minute of sewage, the rate was about once every two weeks. Therefore, there is a problem that the amount of water used for cleaning (for example, 200 to 300 liters / day) increases.

Further, as a result of the shortening of the sewage treatment time due to the above cleaning, there is a problem that the sewage treatment capacity is reduced. With the reduction of sewage treatment capacity, ammonia remains in the recycled water, which is dangerous for fish farming.

[0007] Fig. 12 is a schematic vertical cross-sectional view of an example of a conventional sewage purification apparatus conventionally used to purify general sewage, which is not sewage which is tainted by raising fish, by biological treatment. In FIG. 12, an aerobic biological treatment tank 81 and an anaerobic biological treatment tank 85 are arranged in this order from the wastewater supply side. In the aerobic biological treatment tank 81, sewage is supplied from a supply port 82 a of a sewage supply pipe 82 located at an upper part thereof, and aeration air is spouted from an air port 83 located at a lower part of the aerobic biological treatment tank 81. Aerobic biological treatment. Produced in the aerobic biological treatment tank 81 and settled on the bottom 81a.
The accumulated aerobic biologically treated sludge is discharged from the sludge discharge pipe 84.

The sewage treated in the aerobic biological treatment tank 81 is charged into the anaerobic biological treatment tank 85. The charged wastewater is subjected to anaerobic biological treatment in a central anaerobic biological treatment bed 86.
The sewage treated with the anaerobic organism is supplied to the outlet 87a of the outlet pipe 87.
It overflows and flows out of the tank and is returned as treated water. The anaerobic biological treatment sludge generated on the anaerobic biological treatment bed 86 and deposited and deposited on the bottom 85 a is discharged from the sludge discharge pipe 88. However, since such a two-tank type sewage purification apparatus is large-scale, it is not used for cultivating fish and treating dirty sewage. In anaerobic biological treatment, hydrogen sulfide is generated,
If this remains in the recycled water, it is dangerous for fish farming.

[0009]

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a fish sewage treatment apparatus having a simple structure in which the load is hardly increased and the frequency of cleaning is reduced as much as possible. It is in. Another objective is to recycle safe water for fish farming.

[0010]

As a result of repeated studies to achieve the above object, a sewage filtration apparatus having a simple structure that can be easily and simply cleaned in a short time with a filter medium to which debris adheres is provided. As a result, it has been found that inclusion in a sewage purification device for fish farming is extremely effective, and the present invention has been achieved. The fish culture sewage filtration and purification device of the present invention,
It is configured as follows. That is, the first fish sewage filtration device of the present invention (hereinafter referred to as “first sewage filtration device”).
That. The second and third devices are also referred to as a second sewage filtration device and a third sewage filtration device, respectively). The filter material that allows sewage to pass from the inner surface to the outer surface, and the inner surface of the filter material automatically and relatively. Rubbing removal means is provided, and the filter medium is cleaned by removing the residue adhering to the filter medium by the chip removal means.
As an aspect of the first sewage filtration device, for example, the following can be mentioned. That is, in the first embodiment, (1) a hollow filter medium having an inner surface and an outer surface, and (2) a filter medium inserted through the filter medium and fixed so as to be concentric with the axis of the filter medium,
Swarf removal means comprising a scraper having spiral blades, wherein the cleaning of the filter medium is performed by relatively moving the scraper and the filter medium and rubbing the residue adhered to the inner surface of the filter medium with the scraper. This is done by taking and settling.

The second aspect comprises (1) a hollow filter medium having an inner surface and an outer surface, and (2) debris removing means composed of an outer brush and an inner brush. Move the inner brush relative to the filter media,
The residue adhering to the inner surface of the filter is removed by the inner brush, and the residue protruding to the outer surface of the filter is scraped off by the outer brush and settled.

The filter medium has a cylindrical shape or a rectangular cylindrical shape, and the filter medium and the debris removing means relatively move in the rotation direction or the axial direction. The cross section of the rectangular cylindrical filter medium is, for example, a triangle, a square, or the like.

The second sewage filtration apparatus comprises: (1) a filter medium;
(2) a filter medium having a specific gravity higher than the sewage loaded in the upper part of the filter medium; and (3) a filter medium having a lower specific gravity than the sewage loaded in the lower part of the filter medium. By swaying the filter medium having a large specific gravity and the filter medium having a small specific gravity by sewage flowing upward in the same manner as in the treatment, by automatically tapping the filter medium to remove debris attached to the filter medium. , Characterized in that the filter material is cleaned.

The third sewage filtration apparatus includes a bag-shaped filter medium capable of adhering and storing the scum, and means for reversing the flow direction of the sewage flowing through the filter medium, and the flow direction of the sewage. Is reversed to reverse the bag-shaped filter medium, thereby cleaning the bag-shaped filter medium.

The first to third sewage filtration apparatuses can provide a sewage filtration apparatus having a simple structure that can be easily and simply cleaned in a short time with the filter medium to which the residue is attached.

Further, the sewage purification apparatus for fish culture of the present invention comprises a sewage pretreatment apparatus and a sewage main treatment apparatus, wherein the first to third sewage filtration apparatuses are used as the sewage pretreatment apparatus. And

In the sewage purification apparatus for fish culture of the present invention, the sewage treatment apparatus is used for general sewage sedimentation treatment, biological treatment (secondary treatment such as aerobic biological treatment and anaerobic biological treatment), and tertiary treatment. Conventional sewage treatment equipment may be used,
It is preferable to have one or more aerobic biological treatment tanks having a filter medium and an air diffuser and capable of removing precipitates.

However, the above-mentioned conventional sewage treatment apparatus is provided with a component adjusting tank for adjusting components dissolved in the treated water, for example, for replenishing minerals and reducing residual nitrate ions. Is more preferred.

Further, it is desirable that the waste discharged from the sewage filtration apparatus for fish farming is subjected to aerobic and / or anaerobic treatment and then discarded.

According to the sewage purification apparatus for fish farming of the present invention, the load on the sewage treatment apparatus can be greatly reduced, for example, by a half of the amount of water.
The cleaning frequency of the main sewage treatment apparatus can be extremely reduced.

[0021]

FIG. 1 is a schematic longitudinal sectional view showing a first embodiment of a first sewage filtration apparatus. The first embodiment of the first sewage filtration apparatus shown in FIG. 1 is (1) a filter medium 13 having a hollow cylindrical shape and upper and lower ends of which are restrained from moving up and down by support wheels 11 and 12, for example, 40 to 100 mesh. Wire mesh and (2)
A rotating shaft 14 that is inserted through the inside of the filter medium 13 and is fixed so as to be concentric with the axis of the filter medium 13 is driven by a motor.
a can be rotated as a helical blade 14b
And a scraper 14 attached to a rotating shaft 14a. The sewage is sent to the sewage filtration device 15 from the inlet 15a by the pump P, and the sewage is filtered into the support wheel 11 and the filter medium
After passing through the filter medium 13 from the inside of the filter 3 (see the solid arrow) and passing through the outside thereof, the sewage is discharged from the outlet 15b of the sewage filtration device 15 via the valve A. The scum adhering to the inner surface of the filter medium 13 is scraped off by appropriately rotating the scraper 14, and passes through the support wheel 12, and the sewage filter 1
Settle to the bottom of 5 (see dotted arrow). Sewage filtration device 15
The residue that has settled at the bottom of the
Withdraw valve B from valve c as appropriate.

It is necessary to prevent sewage from passing through the filter medium 13 and between the support wheel 11 and the filter medium 13.
If the support wheel 11 and the filter medium 13 are normally overlapped, the residue is accumulated between them to act as a seal.
Similarly, the support wheel 12 and the filter medium 13 may be normally overlapped.

FIG. 2 is a schematic longitudinal sectional view showing a second embodiment of the first sewage filtration apparatus. The second embodiment of the first sewage filtration apparatus shown in FIG. 2 has a (1) hollow cylindrical shape whose upper and lower ends are prevented from moving up and down by supporting wheels 21 and 22, and is rotated by using a shaft 23a as a rotating shaft driven by a motor. Filter material 23, for example, a wire mesh of 40 to 100 mesh, (2)
The shaft is fixed so as to be concentric with the shaft 23a of the filter medium 23, and is a non-rotating outer brush 24 which is covered in a hollow cylindrical shape on the outside of the filter medium 23, and (3) is inserted through the inside of the filter medium 23. And an inner brush 25 rotatable as a rotating shaft 25a driven by a motor, the shaft being fixed so as to be concentric with the shaft 23a of the filter medium 23. The sewage is sent to the sewage filtration device 26 by a pump P from an inlet 26a of the sewage filtration device 26, passes through the filtration material 23 from the inside of the support wheel 21 and the inside of the filtration material 23 (see the solid line arrow), and after passing through the outside thereof, is filtered. The sewage is discharged from the outlet 26b of the device 26 via the valve A. The residue adhering to the inner surface of the filter medium 23 is scraped off by the appropriately rotating inner brush 25, and the residue adhering to the outer surface of the filter element 23 is relatively scraped off by the outer brush 24 and the filter medium 23 rotating appropriately. The scraps thus scraped pass through the inside of the support wheel 22 from the inside of the filter medium 23 and settle to the bottom of the sewage filtration device 26 (see dotted arrows).
The scum that has settled at the bottom of the sewage filtration device 26 is appropriately pulled out by a valve B from a drawing port 26c provided at the bottom. The brush is preferably made of nylon. Further, a thin plate member in which a large number of holes having a diameter of 3 to 8 mm are scattered may be stacked as a support material on the wire mesh. The brush is provided at one or more locations in the cylindrical direction as necessary or over the entire circumference.

FIG. 3 is a schematic longitudinal sectional view showing a third embodiment of the first sewage filtration apparatus. The third embodiment of the first sewage filtration apparatus shown in FIG.
Filter media 2 that can be prevented from moving up and down by 1 and 22 and that can rotate using shaft 23a as a rotating shaft driven by a motor.
3, for example, a wire mesh of 40 to 100 mesh, a thin sheet material 28 laid on the wire mesh to support the wire mesh and having holes of 3 to 8 mm in diameter, and one circumferential position of the wire mesh 23 A fixed nylon outer brush 24 and an inner brush 25 are provided. The inflow port 2 is connected to the sewage filtration device 26.
6a, the sewage is sent by the pump P, passes through the filter medium 23 from inside the support wheel 21 and the inside of the filter medium 23, passes through the outside, and then flows out from the outlet 26b of the sewage filtration apparatus 26 to the valve A.
Drain the sewage through. The residue adhering to the inner surface of the filter medium 23 is scraped off by the inner brush 25, and the residue protruding from the outer surface of the filter medium 23 is scraped off by the outer brush 24. The scraps thus scraped pass through the inside of the support wheel 22 from the inside of the filter medium 23 and settle at the bottom of the sewage filtration device 26. The scum that has settled at the bottom of the sewage filtration device 26 is appropriately pulled out via a valve B from a drawing port 26c provided at the bottom.

The operation sequence is as follows. That is, in the normal operation, the pump P and the valve A are open and the valve B is closed. During cleaning, pump P and valve A
Is closed, the valve B is opened, and then the pump P is opened.
After the washing is completed, the pump P and the valve B are closed, the valve A is opened, and then the pump P is opened to enter a normal operation.

In the above embodiment, the filter medium and the brush are relatively rotated, but they may be relatively moved in the axial direction. FIG. 8 shows the concept in this case (fourth embodiment). The inner brush 25 and the outer brush are fixed to the shaft 25a,
The filter 2 is moved by a stroke like the arrow of the shaft 25A.
3 rubs by sliding in the axial direction.

FIG. 4 is a schematic longitudinal sectional view showing an embodiment of the second sewage filtration apparatus. The second sewage filtration apparatus shown in FIG. 4 includes (1) a filter medium 31, (2) a filter medium 32 having a higher specific gravity than the sewage loaded in the upper part of the filter medium 31, for example, a glass ball, and (3) a filter medium. A filter medium 33 having a specific gravity lower than that of the wastewater loaded in the lower part of the filter 31, for example, a hollow plastic ball is provided. The sewage is sent to the sewage filtration device 34 from the inflow port 34a, and the sewage is discharged from the outflow port 34b. The filter medium 33 having a low specific gravity forms a filter bed 35, and the relatively coarse wastewater in the sewage flowing from the inflow port 34a is filtered.
5 or settle to the bottom of the sewage filtration device 34.
The residue in the sewage that has passed through the filter bed 35 adheres to the lower surface of the filter medium 31.

By the way, the filter medium 33 having a small specific gravity is swung under the filter medium 31 by the sewage flowing vertically upward in the same manner as in the sewage treatment. Further, the filter medium 32 having a large specific gravity forms a filter bed 36, and is oscillated on the filter medium 31 by the sewage flowing upward in the vertical direction. Due to these swings, the residue adhering to the filter medium 31 is automatically knocked down and settles at the bottom of the sewage filtration device 34. The dregs that settled at the bottom of the sewage filtration device 34 are drawn out from the extraction port 34c provided at the bottom.
Pull out as appropriate.

As described above, the first and second sewage filtration apparatuses have a simple structure, and can easily and simply clean the sewage treatment apparatus in a short time without interrupting the sewage treatment with the filter medium to which the scum adheres.

FIG. 5 is a schematic longitudinal sectional view showing one embodiment of a third sewage filtration apparatus arranged so that sewage flows in a horizontal direction. FIG. 6 is a schematic longitudinal sectional view of a coupling material constituting the sewage filtration device of FIG. Also, FIG.
FIG. 4 is a diagram showing an example of a flow of sewage when the sewage filtration device is mounted on a sewage treatment system to perform sewage treatment and filter material cleaning.

5 to 7, the coupling material 41 is used.
Is a male threaded socket 42 having a threaded end 42a.
And a screw socket 43 for cutting a female screw into one end 43a. Unthreaded end 4 of male screw socket 42
2b with the unthreaded end 43 of the female thread socket 43
After being inserted into the socket b, the male screw socket 42 is tightened and fixed by the tightening fitting 43c of the female screw socket 43. The fastening fitting 43c rotates around an axis 43d included in a horizontal plane at right angles to the axis of the female screw socket 43. When the shaft 43d of the fastening member 43c is rotated to the right in FIG. 6, the tightening is performed, and when the shaft 43d is also rotated to the left, the tightening is loosened.

A bag-like filter material 44 such as a filter cloth is attached to the coupling material 41. At this time, the male screw socket 42
A filter medium 44 is placed so as to cover the unthreaded end 42b. In this state, the female screw of the female screw socket 43 is inserted into the uncut end 43b, and is fixed as described above with the fastening fitting 43c (FIG. 5, filter medium 4 indicated by a solid line
4).

In FIG. 5, in order to prevent the gap 46 between the side surface of the filter medium 44 and the inner surface of the downstream pipe 45 of the sewage treatment system from disappearing during the sewage treatment, the filter efficiency is reduced. At the same time that the filter material 44 is mounted on the ring material 41, a spacer 47, for example, a wire mesh, between the side surface of the filter material 44 and the inner surface of the downstream pipe 45 of the sewage treatment system is also mounted. In addition, during the cleaning of the filter medium 44 described below, the filter medium 44 is attached to the coupling material 41 for the same purpose during the sewage treatment, and at the same time, the side surface of the filter medium 44 and the inner surface of the upstream pipe 48 of the sewage treatment system are connected. A spacer 49, for example, a wire net is also mounted.

Next, the sewage filtration apparatus 50 in which the filter material 44 is mounted on the coupling material 41 as described above is attached to the sewage treatment system shown in FIG. During the sewage treatment, the valves 51 and 52 are closed and the valves 53 and 54 are opened. Then, the sewage is preliminarily treated through a valve 53 and a sewage filtration device 50 as shown by a solid line arrow, and then, through a valve 54, as a pretreated sewage, a sewage treatment system downstream pipe 45 is moved rightward in FIG. Sewage treatment). At this time, the spacer 47
Is effective for preventing the gap 46 between the side surface of the filter medium 44 and the inner surface of the downstream pipe 45 of the sewage treatment system from disappearing and thereby reducing the filtration efficiency.

As the sewage treatment time elapses, the sewage filtration device 5
Since the scale adhering to the inner surface of the zero filtration material 44 increases and the filtration efficiency decreases, it is necessary to remove the scale. At that time, the valves 53 and 54 are closed and the valve 5
Open 1 and 52. Then, the sewage passes through the valve 51 and the sewage filtration device 50 in a direction opposite to that during the sewage treatment as indicated by a chain line arrow. Therefore, the filter medium 44 is reversed (FIG. 5).
The state shown by the one-dot chain line is shown). Then, the scum is sent to the left side of FIG. 7 (to the scum collection device) through the valve 52 through the sewage treatment system upstream pipe 48 together with the sewage. That is, the filter medium 44 is cleaned in a short time using sewage without using new water. At this time, the spacer 49 is
5 between the side surface of the sewage treatment system and the inner surface of the upstream pipe 48
This is effective for preventing the cleaning efficiency from lowering due to the loss of 5.

In the third sewage filtration device arranged so that sewage flows in the vertical direction, it is preferable that the vertical direction is upward because the filter cake is discharged downward from the filter medium during cleaning.

As described above, the third sewage filtration apparatus has a simple structure that can be easily cleaned in a short time with the filter medium to which the residue is attached.

Further, the sewage purification apparatus for fish culture of the present invention comprises a sewage pretreatment apparatus and a sewage main treatment apparatus, wherein the sewage pretreatment apparatus is the first to third sewage filtration apparatuses. I do.

In the sewage purification apparatus for fish culture of the present invention, the sewage treatment apparatus is used for general sewage sedimentation processing, biological processing (secondary processing such as aerobic biological processing and anaerobic biological processing), and tertiary processing. A conventionally used sewage treatment apparatus may be used. However, it is preferable that the main sewage treatment apparatus be composed of such a conventionally used sewage treatment apparatus and a component adjusting tank, since more suitable treated water can be obtained by returning to the original pond. In particular, when performing an anaerobic treatment, it is necessary to perform an aerobic treatment after the anaerobic treatment because hydrogen sulfide may be generated.

FIG. 9 is a schematic longitudinal sectional view showing an embodiment of a preferred sewage treatment apparatus in the sewage purification apparatus for fish culture of the present invention. In FIG. 9, a first aerobic biological treatment tank 81, a second aerobic biological treatment tank 85, and a component adjustment tank 61 are arranged in this order from the inflow side of sewage discharged from a sewage pretreatment device (not shown). Are located. The first aerobic biological treatment tank 81 and the second aerobic biological treatment tank 85 are the same as those described with reference to FIG. 11 in the related art, and have the same numbers as in FIG. First aerobic biological treatment tank 81
The treated water treated in the second aerobic biological treatment tank 85 lacks minerals necessary for fish farming and may contain harmful nitrate ions in an allowable amount or more. The component adjusting tank 61 is disposed downstream of the processing tank 85. In the component adjusting tank 61, the coral 62 is immersed in the treated water treated in the second aerobic biological treatment tank 85 to replenish minerals such as calcium, and a water algae 63 is floated to reduce nitrate ions.

FIG. 10 is a schematic longitudinal sectional view showing an embodiment of a preferred sewage treatment apparatus in the sewage purification apparatus for fish culture of the present invention.

In this system, as in FIG. 9, a first aerobic biological treatment tank 81, a second aerobic biological treatment tank 85, and a biological adjustment groove 61 are arranged. 8
Somewhat different from the ones. Further, a wastewater treatment tank 92 is provided.

The treated water from which most of the fish dung has been removed by the sewage pretreatment device 26 is guided to the sprinkling device 90 via the valve A, and is dropped into the first aerobic biological treatment tank 81. By this dropping, the treated water can absorb oxygen in the atmosphere. First aerobic biological treatment tank 81 and second aerobic biological treatment tank 85
Has a communication port 95 in the lower part, through which treated water enters the second aerobic biological treatment tank 85 from the first aerobic biological treatment tank 81. A diffuser 83 is arranged beside the communication port 95,
Thereby, a gentle circulation flow is formed in the first aerobic biological treatment tank 81. The filter medium 86 in the first aerobic biological treatment tank 81 is provided extremely coarsely.

In the second aerobic biological treatment tank 85, the filter medium 8
6 is filled up, and the treated water rises in this, overflows and enters the lower part of the adjusting tank 61, and the air diffuser 83
With the air flow of the above, it flows upstream through a mineral supply source 62 such as coral and garnet, and is returned to the fishpond from the outlet 96.

Valves C, D, and E are provided below the first aerobic biological treatment tank 81, the second aerobic biological treatment tank 85, and the component adjusting tank 61, respectively. It can be sent to the processing tank 92.

The wastewater treatment tank 92 is provided with the sewage pretreatment device 26.
And has an air diffuser 83 for aerobic biological treatment of the inflowing sediment. In the wastewater treatment tank 92, the water of the aerobic biological treatment device is settled and returned to the fish pond 94 from the outlet 92, and the sediment is appropriately discharged.

In the sewage purification apparatus for fish culture of the present invention, the first to third sewage filtration apparatuses are used as sewage pretreatment apparatuses, so that the load on the main sewage treatment apparatus is greatly reduced. Therefore, the frequency of cleaning the main sewage treatment apparatus is greatly reduced. Further, as described above, the sewage pretreatment device can clean the sewage in a short time by using the sewage without using new water with the filter medium attached.

Therefore, the sewage purification apparatus of the present invention can greatly reduce the frequency of large-scale cleaning and greatly improve sewage treatment efficiency.

Further, it is not preferable from the viewpoint of environmental sanitation that the waste discharged from the sewage pretreatment apparatus be discharged to the sewage as it is. Therefore, it is preferable to decompose with a microorganism by aerobic treatment or anaerobic treatment and then discard.

[0050]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Filtration and purification equipment for fish farming sewage of the present invention for purifying pond water of a pond holding a carp (Examples 1 to 5)
And a conventional fish farming sewage purification device (conventional example 2), after processing 50 liters of sewage per minute and then conducting a sewage treatment test in which the treated water was returned to the original pond for 100 days. Ammonia, nitrous acid, nitrate and COD remaining in the treated water according to the invention (Example 5) and the conventional treated water (Conventional Example 1) will be described below.

In any of the following tests, the pond water was similarly excellent in transparency, and no abnormalities were observed in the ecology of the carp.

[Example 1] A sewage purification apparatus for fish cultivation, comprising the sewage filtration apparatus for fish cultivation of FIG. 1 (outer diameter: 500 mm, length: 1 m) and the main sewage treatment apparatus of FIG. 7, was used. As a result, the cleaning frequency of the main sewage treatment apparatus during the test (the number of days that sewage treatment can be continuously performed with one cleaning) and the average time required for one cleaning are about 30 days and about 30 minutes, respectively. (This result was the same in Examples 2 to 4).

In this test, cleaning of the filter medium by the scraper of the fish sewage filtration apparatus shown in FIG.
The test was performed at a rate of about 10 minutes / time a day.

Example 2 The same operation as in Example 1 was performed except that the wastewater filtration device for fish farming (outer diameter: 500 mm, length: 1 m) shown in FIG. 2 was used instead of FIG.

In this test, the filter medium was cleaned by the inner brush of the fish sewage filtration apparatus of FIG. 2 at the same frequency and time as the scraper of Example 1. In addition, cleaning of the filter media with the outer brush is also performed about once every two days on average for about 1 day.
The test was performed at a rate of 0 minutes / time.

[Example 3] The filtration device for sewage for fish farming (outer diameter: 500 mm, length: 1 m) shown in FIG. 3 and the device shown in FIG.
The procedure was performed in the same manner as in Example 1 except that the main sewage treatment apparatus arranged in a tank series was used.

After this test, some scum was adhered to the filter medium of the apparatus for filtering sewage for fish culture in FIG. 3, but it could be easily removed with a small amount of washing water.

Example 4 The same operation as in Example 3 was carried out except that the wastewater filtration device for fish culture (inner diameter of the pipe: 100 mm) of FIG. 4 was used instead of FIG.

In this test, the cleaning (reversing) of the filter medium of the fish culture sewage filtration apparatus shown in FIG.
The test was performed at a rate of 0 minutes / time. After this test, some scum adhered to the filter medium, but could be easily removed with a small amount of washing water.

Example 5 Thirty carp fish having a size of 30 cm were placed in a fish pond with a water capacity of 1.5 t, and water purification was performed using the system shown in FIG. The feed was given at 400 cc / day, but the water returned to the fishpond after treatment was ammonia 0
mg / l, nitrite 0.25 mg / l, nitrate 25 mg /
1, COD 5 mg / l.

[Conventional Example 1] For comparison with Example 5, a conventional filtration type water purifier was fed with 200 cc / day of food.
The treated water returned to the fishpond is 1.5 mg ammonia /
l, nitrite 0.5mg / l, nitrate 50mg / l, CO
D was 20 mg / l.

[Conventional Example 2] The same procedure as in Example 3 was carried out except that the wastewater filtration device for fish farming of FIG. 3 was not used. As a result, the cleaning frequency of the sewage treatment apparatus during the test (the number of days that sewage treatment can be continuously performed in one cleaning) and the average time required for one cleaning are about 14 days and about 120 days, respectively, on average.
Minutes.

[0063]

The sewage filtration apparatus for fish farming of the present invention has a simple structure, and can be easily cleaned in a short time with the filter material to which the residue is attached. In addition, the sewage purification apparatus for fish farming of the present invention uses the sewage filtration apparatus for fish farming of the present invention as a pretreatment apparatus, so that the load on the sewage treatment apparatus is greatly reduced and the frequency of cleaning the sewage treatment apparatus is extremely reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a first embodiment of a first sewage filtration apparatus.

FIG. 2 is a schematic longitudinal sectional view showing a second embodiment of the first sewage filtration apparatus.

FIG. 3 is a schematic longitudinal sectional view showing a third embodiment of the first sewage filtration apparatus.

FIG. 4 is a schematic longitudinal sectional view showing one embodiment of a second sewage filtration apparatus.

FIG. 5 is a schematic longitudinal sectional view showing an embodiment of a third sewage filtration device.

FIG. 6 is a schematic longitudinal sectional view of a coupling material constituting the sewage filtration apparatus of FIG. 4;

FIG. 7 is a diagram showing a flow of sewage when the sewage filtration device of FIG. 4 is attached to a sewage treatment system to perform sewage treatment and filter material cleaning.

FIG. 8 is a vertical cross-sectional view showing a fourth embodiment of the first sewage filtration apparatus.

FIG. 9 is a schematic longitudinal sectional view showing one embodiment of a preferred sewage treatment apparatus in the sewage purification apparatus for fish culture of the present invention.

FIG. 10 is a schematic longitudinal sectional view showing one embodiment of a preferred sewage treatment apparatus in the sewage purification apparatus for fish culture of the present invention.

FIG. 11 is a schematic longitudinal cross-sectional view of a conventionally used sewage purification device for fish farming.

FIG. 12 is a schematic vertical sectional view of a conventional sewage purification apparatus used for sewage.

[Explanation of symbols]

 11, 12, 21, 22 Supporting wheels 13, 23, 31, 44 Filtration material 14 Scraper 15, 26, 34, 50 Sewage filtration device 24, 25 Brush 32, 33, 73 Filter material 35, 36, 74 Filter floor 41 Coupling Materials 42, 43 Sockets 45, 48 Pipes 46, 55 Gaps 47, 49 Spacers 51, 52, 53, 54 Valves 61 Component adjusting tank 62 Coral 63 Aquatic algae 71, 82 Sewage supply pipe 72 Tank vessel 75, 87 Sewage discharge pipe 76 Extraction port 77, 83 Air port (aeration pipe) 81, 85 Biological treatment tank 84, 88 Sludge discharge pipe 73, 86 Filter media

────────────────────────────────────────────────── ─── Continued on front page (51) Int.Cl. ⁶ Identification code FI C02F 1/68 540 C02F 1/68 540Z 3/06 ZAB 3/06 ZAB

Claims (10)

[Claims] 1. A filter medium comprising: a thin filter medium for allowing sewage to pass from an inner surface to an outer surface; and a means for automatically and relatively rubbing the surface of the filter medium, and removing the residue adhering to the filter medium. A filthy water filtration device for fish farming, wherein the filtration material is cleaned by removing the filtration material by means. And (2) a hollow filter member having an inner surface and an outer surface, and (2) a spiral blade inserted through the filter member and fixed so as to be concentric with the axis of the filter member. And a scrap removing means comprising a scraper having, wherein the cleaning of the filter medium relatively moves the scraper and the filter medium,
The sewage filtration device for fish farming according to claim 1, wherein the scum adhering to the inner surface of the filter material is scraped off by the scraper and settled. 3. A filter comprising: (1) a hollow, thin filter having an inner surface and an outer surface; and (2) debris removing means comprising an outer brush and an inner brush, and the filter is cleaned with the outer brush and the inner brush. Is moved relative to the filter medium, and the residue adhering to the inner surface of the filter medium is rubbed off by the inner brush with the outer brush, and the settled particles are settled by the inner brush. 2. The sewage filtration device for fish farming according to 1. 4. The fish culture sewage filtration according to any one of claims 1 to 3, wherein the filtration material is cylindrical or rectangular tube-shaped, and the filtration material and debris removing means move relatively in a rotating manner or in an axial direction. apparatus. 5. A filter medium having: (1) a filter medium; (2) a filter medium having a higher specific gravity than sewage loaded at an upper part of the filter medium; and (3) a filter medium having a specific gravity lower than sewage loaded at a lower part of the filter medium. The cleaning of the filter medium is performed by oscillating the filter medium having a large specific gravity and the filter medium having a small specific gravity by sewage flowing vertically upward as in the case of sewage treatment, and automatically tapping the filter medium. A filter device for sewage for fish farming, wherein the filter material is cleaned by removing residue adhering to the filter material. 6. A bag-like filter medium capable of adhering and storing dregs, and means for reversing the flow direction of sewage flowing through the filter medium, the bag being formed by reversing the flow direction of the sewage water. A filter for sewage for fish farming, characterized in that the filter material in the shape of a bag is reversed to release and remove the clogs in the filter material in the form of a bag. 7. A sewage pretreatment device and a main sewage treatment device, wherein the sewage pretreatment device is the sewage filtration device for fish farming according to any one of claims 1 to 6, wherein Sewage purification equipment. 8. The sewage purification apparatus for fish culture according to claim 7, wherein the main sewage treatment apparatus has a filter medium and an aeration device, and has one or more aerobic biological treatment tanks capable of removing precipitates. 9. The sewage treatment apparatus according to claim 7, further comprising a component adjusting tank for replenishing minerals and reducing nitrate ions.
A sewage purification device for fish farming according to claim 1. 10. The fish culture sewage purification apparatus according to claim 7, wherein a slag discharged from the fish culture sewage filtration apparatus is subjected to an aerobic treatment and / or an anaerobic treatment.