JPH04104748A - Device for cleaning fish-culturing water - Google Patents

Abstract

PURPOSE:To provide the subject device capable of effectively cleaning supply water, preventing fishes and shellfish from diseases caused by pathogenic bacteria and fungi and accelerating the good growth of the fishes and shellfish by disposing an organic substance, solid substance-removing means and a pressure- driven separation membrane means in a line for supplying water in a fish culture tank. CONSTITUTION:In the objective device, a biomembrane treating tank 20 comprising a tapered portion 21 and a cylinder portion 22 having a filter bed (e.g. a filter material comprising activated carbon or the like) disposed between an upper support member 24 and a lower support member 25 and a pressure- driven separation membrane means 65 comprising an ultrafiltration membrane and connected to pipes 50, 52, 54, 56, 58 and 60 from the inside of an oxygen- dissolving tank 40 are disposed in a line for the supply water 130 of a fish culture tank 90.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Field of Industrial Application) This invention relates to a fish farming water purification device for purifying supply water for fish tanks, ponds, etc. for raising fish and shellfish.

(Prior art) For example, as a fish water purification device used to purify supplementary water in fish tanks, ponds, etc. for raising fish and shellfish using treated water obtained from water treatment facilities such as wastewater and sewage treatment plants. ,
Conventionally, a device as shown in FIG. 2 has been known.

This conventional fish farming water purification device supplies make-up water 1 to a biofilm treatment tank 2 to remove organic matter and solid matter contained in the make-up water 1, and then supplies it to an oxygen dissolution tank 3 to remove the organic matter and solid matter contained in the make-up water 1. The dissolved oxygen concentration (DO) is raised to near saturation by bringing it into contact with air bubbles 5 sent from
116. The water in the fish culture tank 6 is supplied to a biofilm treatment tank 7 to reduce contaminants such as fish excrement and pathogenic bacteria, and further supplied to an oxygen dissolution tank 9 to increase DO. The pump 10 is used for fish farming P! 6, to perform cyclical purification. Note that the on-off valve 11 is for discharging sludge accumulated at the bottom of the fish culture tank 6, and 12 is overflow water.

(Problem to be solved by the invention) However, in such a conventional fish farming water purification device,
If pathogenic bacteria such as Escherichia coli, mold, pests, or even eggs of pests are present in the supplementary water 1, they cannot be removed in the biofilm treatment tank 2, and they proliferate due to the aeration in the oxygen dissolution tank 3. There is a problem in that the fish 8 in the fish culture tank 6 are contaminated with pathogenic bacteria and pests, and may become infected and die.

Furthermore, in order to remove pathogenic bacteria and pests in the fish culture tank 6, even if circulation purification is performed using the biofilm treatment tank 7 and the oxygen dissolution tank 9, the biofilm treatment tank 7 cannot remove the pathogens and pests sufficiently. However, there was a problem in that the fish 8 could die due to the proliferation of pathogenic bacteria and pests.

This invention was made in view of such conventional problems, and it is possible to make the fish and shellfish in the fish tank grow normally by removing pathogens and pests from the supply water and then replenishing the fish tank. The purpose of the present invention is to provide a fish farming water purification device that makes it possible to purify fish water.

[Structure of the Invention] (Means for Solving the Problem) The fish farming water purification device of the present invention includes an organic matter/solid matter removal means for removing organic matter/solid matter in the make-up water line of a fish tank, and a means for removing organic matter/solid matter in the make-up water line of the fish tank. and a pressure-driven separation membrane means for sterilizing bacteria.

(Function) In the fish farming water purification device of the present invention, organic matter and solid matter in the make-up water are removed by an organic matter and solid matter removal means such as a biofilm treatment means, and pathogenic bacteria and other substances in the make-up water are removed by a subsequent pressure-driven separation membrane means. By separating and removing pests and replenishing the fish tank with water that has passed through the pressure separation driven membrane, safe water can be supplied to the fish and shellfish in the fish tank.

(Example) Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.

FIG. 1 shows an embodiment of the present invention, in which a biofilm treatment tank is used as the organic matter/solid matter removal means, and an ultrafiltration membrane (hereinafter referred to as UF membrane) is used as the pressure-driven separation membrane means. An example of a purification device is shown.

In FIG. 1, 20 is a biofilm treatment tank, 40 is an oxygen dissolution tank, 65 is a UF membrane module, 90 is a fish culture tank, 100 is a biofilm treatment tank for circulating water, 114 is an oxygen dissolution tank, 120
is a circulation pump.

The biofilm treatment tank 20 is formed of an inverted conical tapered part 21 and a cylindrical part 22, and an overflow wall 23 is disposed at the upper part concentrically with the biofilm treatment tank 20, and an upper support part A filter bed 26 filled with a material such as activated carbon, sand, and ceramic 7x is provided between the lower gap part 24 and the lower support part 25.
7 is provided with an aeration pipe 28. This diffuser pipe 28 is connected to an air source 31 via a pipe 30 having an on-off valve 29, and a pipe 33 having a pump 32 is arranged on the side surface of a portion corresponding to the lower gap 27 at the bottom of the cylindrical portion 22. A pipe 35 having an on-off valve 34 is disposed at the bottom of the tapered portion 21. Pipe 36 connected to overflow wall 23
The overflow water is made to flow down to the upper part of the oxygen dissolution tank 40.

The oxygen dissolving tank 40 is formed from an inverted conical tapered part 41 and a cylindrical part 42, and a diffuser pipe 43 is provided at the bottom thereof. This diffuser pipe 43 is connected to the air source 31 via a pipe 45 having an on-off valve 44, and a pipe 47 having an on-off valve 46 is connected to the bottom of the oxygen dissolving tank 40.

Oxygen dissolution 1'! A water level gauge 48 having an upper limit switch and a lower limit switch is provided within the water level controller 40 and is electrically connected to a level controller 49 .

A pipe 50 is located below the lower limit switch position of the water level gauge 48 inside the oxygen dissolution tank 40 and above the aeration pipe 43.
Or is provided. This pipe 5o includes a pump 51 and a pipe 52.
, connecting portion 53, pipe 54, on-off valve 55, pipe 56, connecting portion 5
7, a pipe 58, a collector 59, and a pipe 60, which are connected to the inlet side 66 of the UF membrane module 65 in this order. The outlet side 67 of the UF membrane module 65 is connected to a pipe 68, a collector 69, and a pipe 7.
It is connected to the upper part of the oxygen dissolving tank 4o via a 0° connection part 71, a pipe 72, an on-off valve 73, a pipe 74, a connection part 75, and a pipe 76 in this order.

A sponge ball 7 is attached to this UF membrane module 65.
7, the output side of the level controller 49 is electrically connected to the input side of the pump 51, and the connecting part 53
is connected to the connecting portion 71 via a pipe 81 having an on-off valve 80, and the connecting portion 57 is connected to the connecting portion 75 via a pipe 83 having an on-off valve 82.

A pipe 86 connected to the permeated water outlet side 85 of the UF membrane module 65 is configured to flow make-up water to the upper part of the fish culture tank 90.

An overflow wall 91 is provided at the top of the fish culture tank 90, and this overflow wall 91 is connected to a pipe 92, and a pipe 94 having an on-off valve 93 is connected to the bottom of the fish culture tank 90. .

Further, a pipe 96 having a pump 95 is provided on the side surface of the fish culture tank 90, and the pipe 96 is connected to the lower side surface of the biofilm treatment tank 100.

The biofilm treatment tank 100 is formed from an upper cylindrical part 101 and a lower tapered part 102, and a filter bed 105 filled with a filter material is provided between an upper support part 103 and a lower support part 104. A diffuser pipe 107 is provided in the lower gap 106.
or has been set up.

This aeration pipe 107 is connected to the air source 31 via a pipe 109 having an on-off valve 108, and is connected to the biofilm treatment tank 10.
A pipe 111 having an on-off valve 110 is connected to the bottom of the 0.

An overflow wall 112 disposed at the top of the biofilm treatment tank 100 is connected to the top of an oxygen dissolution tank 1114 via a pipe 113.

The oxygen dissolution tank 114 has a cylindrical portion 115 and a tapered portion 116.
The oxygen dissolving tank 114 has a diffuser pipe 11 in the lower part thereof.
7 is provided, and this diffuser pipe 117 is connected to the air source 31 via a pipe 119 having an on-off valve 118. The lower part of the oxygen dissolution tank 114 is connected to the upper part of the fish tank 90 via a pipe 121 having a pump 120, so that the treated fish water is returned to the fish tank 90.

Next, the operation of the fish farming water purification device having the above configuration will be explained.

The fish farming water purification device of this embodiment includes (1) makeup water purification operation, (2) UF membrane cleaning operation, (3) makeup water line biofilm treatment tank cleaning operation, (4) fish farming water purification operation, (5) ) A biofilm treatment tank cleaning operation of the circulation line can be performed.

(1) Make-up water purification operation Close all on-off valves, operate the pump 32, and clean the make-up water 1.
30 to biofilm treatment 120.

The makeup water 130 ascends through the lower gap 27, the lower support 25, the filter bed 26, and the upper support 24 in this order.

In the process of passing through the filter bed 26, the solids in the make-up water 130 are attached and adsorbed to the material in the filter bed 26, and the organic matter is decomposed and removed by the biofilm formed on the surface of the filter material in the bed 26. Ru.

The water with reduced organic matter and solid matter flows through the overflow wall 23.
The oxygen is supplied to the oxygen dissolution tank 40 via a pipe 36.

When the liquid level of the water supplied into the oxygen dissolving tank 40 rises and reaches the upper limit switch of the water level gauge 48, the pump 32 is stopped, the on-off valve 44 is opened, and air is blown into the oxygen dissolving tank 40. Then, after aeration is carried out for several minutes to raise Do of the water in the oxygen dissolving tank 40, the on-off valve 44 is closed.

Next, the on-off valve 55 and the on-off valve 73 are opened, and the pump 51 is operated to perform UF membrane operation. In other words, the oxygen dissolution tank 40
The water inside is passed through the pipe 50, pump 51, pipe 52, connecting part 53, pipe 54, on-off valve 55, pipe 56, connecting part 57, pipe 58, collector 59, and pipe 60 in order to the UF membrane Moneur 65. The inlet side 66 is supplied.

Then, this water passes through the UF membrane module 65 and sequentially passes through the pipe 68, collector 69, pipe 70, connection part 71, pipe 72, on-off valve 73, pipe 74, connection part 75, and pipe 76 from the outlet side. The oxygen is returned to the oxygen dissolution tank 40 through the oxygen dissolution tank 40 and circulated therein.

Pathogens and pests such as Escherichia coli and mold in the oxygen dissolution tank 40 cannot pass through the UF membrane of the UF membrane monole 65, and some of the make-up water passes through the UF membrane with the pathogens and pests completely removed. The upper part of the fish tank 90 is replenished from the outlet side 85 via a pipe 86.

When the amount of sterilized water supplied to the fish culture tank 90, that is, the liquid level in the oxygen dissolving tank 40 decreases by the amount of permeation through the UF membrane, and the liquid level reaches the lower limit switch of the water level gauge 48, the pump 51 is stopped. do. Then, the pump 32 is operated in the same manner as described above to supply the make-up water 130 to the biofilm treatment tank 20, and the above operations are repeated to purify the make-up water 130.
It is sterilization.

(2) UF membrane cleaning operation In this operation, when the make-up water purification operation is performed using the UF membrane module 65, a cake layer of dirt is formed on the surface of the UF membrane, but this is peeled off and cleaned using the sponge ball 77. It is carried out according to the following operations, with openings from 1 to 10 times a day.

When the liquid level in the oxygen dissolution tank 40 reaches the upper limit switch of the water level gauge 48 and the upper limit switch is turned on, the on-off valve 55
and close the on-off valve 73, open the on-off valve 80 and the on-off valve 82,
Activate the pump 51.

With this operation, the water in the oxygen dissolution tank 40 is transferred to the pipe 50, pump 51, pipe 52, and connecting portion 53 as shown by the dashed line a.
, pipe 81, on-off valve 80, connecting part 71, pipe 70, collector 6
9, the pipe 68, the outlet side 67, the UF membrane module 65, the inlet side 66, the pipe 60, the collector 59, the pipe 58, the connecting part 57, the pipe 83, the on-off valve 82, the connecting part 75, and the pipe 76 in order. It is returned to the original oxygen dissolution tank 40. By this operation, the flow inside the UF membrane module 65 is reversed from that during the make-up water purification operation, and the sponge balls 77 in the collector 69 become UF.
In the process of passing through the membrane module 65, the cake layer formed on the surface of the UF membrane is peeled off.

Next, after stopping the pump 51 and closing the on-off valve 80 and the on-off valve 82, the on-off valve 55 and the on-off valve 73 are opened and the pump 51 is closed.
is activated, the flow is reversed to the original state, and the sponge balls 77 are passed through the UF membrane module 65 from the collector 59 to the collector 69 side.

By repeating this operation 5 to 10 times, the cake layer on the surface of the UF membrane can be peeled off as the sponge ball 77 passes through the inside of the UF membrane module 65, and the UF membrane can be regenerated.

(3) Biofilm treatment tank cleaning operation of makeup water line This operation forcibly removes the biofilm excessively attached to the surface of the filter media of the filter bed 26 in the biofilm treatment tank 20 in the makeup water purification operation of (1) above. This operation is performed by the following operation at an opening degree of 1 to 7 times a week.

All on-off valves are closed, and the pump 32 is operated to supply makeup water 130 to the biofilm treatment tank 20 and overflow from the overflow wall 23. If an overflow occurs, the on-off valve 34 is opened to bring the liquid level below the overflow wall 23 and above the upper support portion 24.

Next, open the two on-off valves to supply air into the biofilm treatment tank 20, and aerate for 1 to 10 minutes to forcibly peel off the biofilm excessively attached to the surface of the filter medium of the filter bed 26 by the shearing force of the air. let Subsequently, the on-off valve 29 is closed to stop the air supply, and the on-off valve 34 is opened to drain the detached biofilm through the pipe 35.

After removing mud, close the on-off valve 34 and operate the pump 32,
Shift to the make-up water purification operation in (1) above.

(4) Fish culture water purification operation This operation is to remove organic matter and solid matter contained in the fish culture water in the fish culture tank 90, and is performed simultaneously in parallel with the make-up water purification operation in (1) above. It will be done.

First, all the on-off valves 93, 108, 110, and 118 are closed, and the pump 95 is operated to supply water from the fish tank 90 to the biofilm treatment tank 100 via the pipe 96. The fish farming water reaches the overflow wall 112 via the lower gap 106, the lower support 104, the filter bed 105, and the upper support 103 in this order. In the process of the fish farming water passing through the filter bed 105, organic matter and solid matter in the fish farming water are decomposed and adsorbed by the biofilm attached to the surface of the material on which the filter bed 105 is covered.

Water from which these contaminants have been removed is supplied to an oxygen dissolution tank 114 via a pipe 113. Here, the on-off valve 118 is opened to supply air to the oxygen dissolving tank 114, and the oxygen dissolving tank 1
The Do of water in 14 is raised to near the saturation concentration.

When the liquid level rises, the pump 120 is activated to return the water inside the oxygen dissolution tank 114 to the fish culture tank 90 via the pipe 121 for circulation purification.

Here, the flow rate of the pump 120 is set to be slightly slower than that of the pump 95 so that the fish culture water stays in the oxygen dissolution tank 114 for a sufficiently long time and receives oxygen supply.

(5) Circulating water line biofilm treatment tank cleaning operation This operation is exactly the same as the makeup water line biofilm treatment tank cleaning operation in (3) above, and the filter bed 105 in the biofilm treatment tank 100 is Forcibly removes the biofilm that is excessively attached to the surface of the filter media. This operation is performed 1 to 7 times a week.

In this way, in this fish farming water purification device, the make-up water 13
0, organic matter and solid matter are removed by biological treatment in the biofilm treatment tank 20, and Do is further increased in the oxygen dissolution tank 40 and guided to the UF membrane module 65, where pathogenic bacteria, pests, and eggs of pests are removed. However, the fish culture tank 90 can be replenished with clear and sterilized water.

In the above embodiment, UF is used as the pressure-driven separation membrane means.
Although a membrane module was used, in the case of a UF membrane module,
The permeation flux is large and a large amount of sterilized water can be supplied to the fish tank. Further, by using a fixed bed type biofilm treatment tank as the biofilm treatment means, organic matter and solid matter in the make-up water can be efficiently removed at the same time. Furthermore, the backwashing device for the filter bed in the biofilm treatment tank uses air blown from the aeration pipe to quickly peel off and remove excess biofilm that has adhered to the surface of the filter media in the filter bed. I can do it.

Furthermore, since an aeration device is built into the biofilm treatment tank, the Do of the sterilized water can be maintained at a high level, allowing the fish and shellfish in the fish tank to be raised normally.

In addition, by using a sponge ball to clean the UF membrane module, cleaning can be performed quickly by simply opening and closing the on-off valve.

Note that the present invention is not limited to the above embodiments, and in particular, as the pressure-driven separation membrane means, instead of the UF membrane, pressure-driven membranes such as hollow membranes and reverse osmosis membranes (RO membranes) may be used. can be widely used.

Among biofilm treatment methods, a fixed bed type biofilm treatment tank is used as a means for removing organic matter and solid matter. Any of the processing methods used can be utilized.

Further, the numbers of pressure-driven separation membrane means and biofilm treatment tanks are not limited, and a combination of a plurality of them may be used.

In addition, it is also possible to incorporate existing treatment methods other than the pressure-driven separation membrane and biofilm treatment tank into the fish farming water purification apparatus of each of the above embodiments, such as ozone treatment, UV sterilization, coagulation sedimentation method, etc. Chemical treatment, biological treatment such as activated sludge, and physical treatment using sedimentation tanks and strainers can be incorporated.

[Effects of the Invention] As described above, according to the present invention, a pressure-driven separation membrane means is provided in addition to organic matter/solid matter removal means for make-up water supplied to fish tanks, ponds, etc., to remove pathogens, pests, and pests in the make-up water. Since we remove pest eggs, etc. from the replenishment water, we physically remove pathogens and pests that can have a fatal effect on fish and shellfish, as well as remove organic matter and solid matter from the replenishment water, making it possible to use clean water for replenishment. Unlike conventional methods, fish and shellfish are not killed by diseases caused by pathogenic bacteria or pests in the supply water, and can grow normally.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a system diagram of a conventional example. 20... Biofilm treatment tank 40... Oxygen dissolution tank 65.
・・Pressure driven separation membrane means

Claims (1)

[Claims] A fish farming water purification device comprising a make-up water line of a fish tank equipped with an organic matter/solid matter removal means for removing organic matter/solid matters, and a pressure-driven separation membrane means for sterilizing bacteria in the make-up water.