JPH08131019A - Circulation-type cleaning apparatus for water of fish and shellfish breeding tank - Google Patents

Abstract

PURPOSE: To efficiently perform the filtration of the water of a fish and shellfish breeding tank simultaneously with the sterilization of the water with ozone. CONSTITUTION: Breeding tank water 2 in a breeding tank 1 is taken out through a strainer 3 with a pump 4 and passed through a filtering part A containing a prefilter 8 for removing coarse particles and a main filter 9 for removing fine particles. Ozone generated by an ozone generator 12 is introduced into the breeding water with an elector 13. The ozonized water is passed through an ozone-dissolution static mixer 14 and a gas-liquid separation tank 15 and the waste ozone is released to the atmosphere through a waste ozone decomposing apparatus 16. The breeding tank water is passed through a residual dissolved ozone removing part C and returned to the breeding tank 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating purifying apparatus for fish and tank breeding water, that is, a circulating purifying apparatus for water for breeding and breeding facilities of seawater or freshwater fish and shellfish (breeding tank water).

[0002]

2. Description of the Related Art Conventionally, direct ozone aeration method and sand filtration method have been known as means for purifying fish tank water.
These methods have the following problems. The former is to diffuse ozone directly into the breeding tank (such as bubbling),
Dissolution efficiency of ozone in water is poor, a large capacity ozone generator is required, and blown ozone is diffused on the water surface of the breeding tank, so it is particularly preferable for the working environment in the case of a breeding tank installed indoors. It has no effect.
The effect on seafood cannot be ignored.

In the latter method of sand filtration, the scale of the equipment is large and a large area is required, which not only increases the cost but also requires time for maintenance for sand replacement.
In addition, it cannot remove organic matter and aquatic bacteria. A membrane filter may be used to remove these, but there is a problem that clogging occurs immediately and it is not practical.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and to efficiently perform filtration of water in breeding tanks and sterilization by ozone at the same time. Efficiently purify while circulating the tank water,
Furthermore, it aims at providing the apparatus which can also discharge | release the used ozone safely.

[0005]

DISCLOSURE OF THE INVENTION The present invention comprises a pump for drawing water from a fish breeding tank through a strainer.
It is equipped with a filter unit having a prefilter for removing coarse particles and a main filter for removing fine particles, a purifying unit for ozone, and a residual dissolved ozone removing unit, and allows the breeding tank water drawn out from the pump to pass through the respective units. It is a circulation type purification device for water of fish and shellfish breeding tank, which is configured to be returned to the breeding tank.

In the present invention, the ozone purifying section comprises an ozone generator, an ejector for injecting ozone generated by the ozone generator into breeding tank water, a static mixer for dissolving ozone, an ozone contact separation tank, and waste ozone decomposition. And a device.

A preferred embodiment of the circulation type purification apparatus according to the present invention will be described below with reference to the flow chart shown in FIG. First, from the breeding tank 1, pipe the water 2
Is discharged by the pump 4 via the suction strainer 3. The suction strainer 3 may be made of stainless steel wire mesh, winding (notch wire type) or the like, and protects the pump.

A bypass circuit 6 provided with a flow rate adjusting valve 5 is provided on the discharge side of the pump 4 so that the flow rate is adjusted in the circulation circuit. The breeding tank water 2 is led to the filter filtration section A through the flow meter 7. The filter filtration section A includes a prefilter 8 for removing coarse particles from the upstream side.
Next, it comprises a main filter 9 for removing fine particles.

As the prefilter 8, a mat-shaped one using woven cloth, non-woven cloth or the like is preferably used. As the main filter 9, a pleat type one using a synthetic fiber filter material such as polypropylene or polyester is preferably used. These filter media have good rigidity and can be fed back. It is also a harmless material for seafood. The prefilter 8 and the main filter 9 may be integrated. Coarse particles are removed by the pre-filter 8 and finer particles are removed by the main filter 9. In this way, the double filtering section is formed to ensure the filtering. SS
(Suspended particulate matter) is removed as it passes through the filter. A pressure gauge 1 is installed on the inlet side and the outlet side of the main filter 9.
0 and 11 are provided.

Next, the breeding tank water 2 is guided to the ozone purifying section B. The ozone purifying section B includes an ozone generator 12, an ejector 13 for sucking ozone (gas) supplied from the ozone generator 12 into a pipe, an ozone dissolving static mixer 14 for efficiently dissolving ozone, and ozone contacting. It has a separation tank 15 and a waste ozone decomposing device 16. The ozone generator 12 may be of a discharge type, an electrolytic type, or an ultraviolet type. The discharge type is preferably a silent discharge type and a rotating electrode type. The electrolytic type is suitable for a device requiring high concentration. The UV type can be used for small volumes.

The breeding tank water into which ozone gas has been injected from the ejector 13 is guided to the static mixer 14. As the static mixer 14, a wire net, a filler (ceramic balls, etc.) is used, and as a particularly suitable one, a rectangular plate material is alternately twisted to the right and the left element is twisted to the left. An example is a type in which the right element and the left element are arranged and fixed at 90 ° each. By the element that forms a spiral structure, the flow is reversed, or from the center to the wall,
Moreover, the flow is changed from the wall portion to the central portion, and the mixing is efficiently performed. Organic substances and aqueous bacteria in the breeding tank water are decomposed, sterilized, and purified by ozone generated from the ozone generator 12 and injected through the ejector 13. Sign 1
7 is a three-way solenoid valve.

The breeding tank water mixed with ozone is further guided to the ozone contact separation tank 15. Ozone contact separation tank 15
Dissolution of ozone in the breeding tank water is promoted during passage through the tank, and sufficient ozone treatment (purification by ozone) time is secured. As the ozone contact separation tank 15, for example, the one shown in FIG. 2 can be used. In the ozone contact separation tank 15 shown in FIG. 2, the breeding tank water is guided to the lower part in the tubular main body 21 through the inflow tube 22 having an inlet at the upper part of the tubular main body 21, and around the central inflow tube 22. After passing through the inner side of the outer tube 23 provided upright, the outer tube 23 is discharged from the upper side to the outer side of the outer tube 23 and is discharged from the discharge port 24 in the lower portion of the cylindrical main body 21. Undissolved (excess) ozone is ozone contact separation tank 15
Is separated into gas and liquid. Ozone contact separation tank 1 shown in FIG.
In 5, the waste ozone is discharged from the upper portion of the outer pipe 23 around the inflow pipe 22 to the waste ozone outlet 25 (white arrow).

Further, the waste ozone is used as a waste ozone decomposing device 16
Is decomposed and released into the atmosphere. The waste ozone that has been gas-liquid separated is completely decomposed by the waste ozone decomposing device 16 and discharged into the atmosphere, so that safety is ensured. As the waste ozone decomposing device 16, a heater, a catalyst or other means can be used. It is preferable that the waste ozone is heated and decomposed by a heater, and the residual ozone is completely decomposed by a catalyst and discharged as safe air. In addition, the heating of the heater removes the moisture of ozone gas, and the life of the catalyst can be extended.

Next, the water in the breeding tank that has been treated with ozone is transferred to the residual dissolved ozone removing section C, and returns to the breeding tank 1 via the activated carbon filter 18. The ozone remaining in the breeding tank water is completely removed through the filter 18.
Instead of the activated carbon filter, a silver impregnated filter or other filter capable of removing residual dissolved ozone can be used.

In the above-described embodiment, the derived breeding tank water is passed through the filter unit A, the ozone purification unit B, and the residual dissolved ozone removal unit C in this order. Before passing through A, it may be configured to pass each part of the ozone purifying section B and the residual dissolved ozone removing section C. Further, by manufacturing the device of the present invention as an integrated device, providing a connecting portion to the breeding tank and attaching a caster, it becomes possible to move, and it is very convenient that it can be used for a plurality of breeding tanks.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the flow chart shown in FIG.
For 100 liters of fish culture (charr, rainbow trout, carp) breeding water, continuous purification was performed with a pump at a flow rate of 10 liters / minute to measure the degree of water purification. A silent discharge type ozone generator (capacity 1 g / h) was used as the apparatus, and the injected ozone concentration was set to 1000 ppm. As the prefilter, a non-woven mat-shaped one was used, and as the main filter, a pleated polypropylene filter material having a pore size of 30 μm was used. The test water before the start of operation was dissolved oxygen 9.7 mg / liter, BO
D 6.84 mg / liter, transparency 76.3%, suspended solids 75.0 mg / liter, general viable cell count 1.8 × 10 ⁴
It was a piece / ml.

In the test water after continuous operation for 2 hours, the dissolved oxygen increased to 11.6 mg / liter by about 20%, and the BOD
Was 4.20 mg / liter, a decrease of 38.6%, transparency was 100.0%, suspended solids was 0.0 mg / liter, viable cell count was 0 / ml, and 100% sterilization was performed. The purification effect was confirmed. BOD drop, DO
It is expected that the breeding yield will be improved by increasing On the other hand, in a device without a filter unit, it is not possible to remove suspended solids, and the sterilization rate after continuous operation for 2 hours is 9
It was only 2.7% and could not be completely sterilized.

[0018]

According to the present invention, the breeding tank water is drawn out by the pump, the filter unit, the ozone purifying unit,
A circulation process is performed in which the water is returned to the breeding tank through the residual dissolved ozone removal section. By this circulation treatment, the breeding tank water is purified by the synergistic action of the decontamination effect such as the decomposition of organic substances by ozone, the sterilization of aqueous bacteria, and the removal of polluted suspended matters by the filter.

By improving the dissolved oxygen content, improving the transparency, decomposing organic matter, and sterilizing aqueous fungi (sterilizing pathogenic bacteria), the healthy growth of seafood is promoted and the yield is improved. It is extremely useful for water purification and breeding management. In addition, the surplus ozone is completely decomposed by the waste ozone decomposing device and discharged, so that safety is ensured. In the case of seawater, bromine oxidant is generated by ozone, but it is similarly removed by the residual dissolved ozone removal unit.

[Brief description of drawings]

FIG. 1 is a flow chart illustrating an embodiment of a circulating purification apparatus according to the present invention.

FIG. 2 is a vertical cross-sectional view illustrating an ozone contact separation tank 15.

[Explanation of symbols]

 A Filter unit B Purification unit by ozone C Residual dissolved ozone removal unit 1 Rearing tank 2 Rearing tank water 3 Strainer 4 Pump 8 Prefilter 9 Main filter 12 Ozone generator 13 Ejector 14 Static mixer 15 Ozone contact separation tank 16 Waste ozone decomposing device 18 Activated carbon filter

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location C02F 1/50 531 R 540 A 550 H 560 AZ 1/78

Claims (2)

[Claims] 1. A pump for discharging breeding tank water from a fish and shellfish breeding tank through a strainer, a filter filtering section having a prefilter for removing coarse particles and a main filter for removing fine particles, a cleaning section for ozone, and a residue. A circulation type purifying apparatus for fish and shellfish breeding tank water, comprising a dissolved ozone removing unit, and configured so that the breeding tank water derived from a pump is passed through the respective units and returned to the breeding tank. 2. The ozone purifying unit includes an ozone generator, an ejector for injecting ozone generated by the ozone generator into breeding tank water, an ozone dissolving static mixer, an ozone contact separation tank, and a waste ozone decomposing device. The circulating purifying apparatus for water of fish and shellfish breeding tank according to claim 1, comprising: