JP7586451B2 - Cleaner unit and circulating filtration type high density eel farming device using the same - Google Patents

Description

The present invention relates to an eel farming device, and more specifically to a cleaner unit that maintains the eel's habitat in the best possible condition, enabling high-density eel farming, and that can select sick eels, and a circulating filtration type high-density eel farming device that uses the same.

In general, efficient cultivation of aquatic organisms requires a strictly controlled rearing environment that meets various conditions, including feeding (feed, nutrients, etc.), water quality, dissolved oxygen, water temperature, pH, and rearing density. If the rearing environment is not suitable, the mortality rate of aquatic organisms will increase, and there will be certain limitations to their growth rate and size.

Run-through fish farms are open-type farms in which water is continuously passed from the outside into the breeding ponds, which requires a large amount of breeding water and is heavily affected by the natural environment in which the farm is located. In addition, they have disadvantages such as low breeding density, water pollution caused by leftover feed, excrement, ammonia, and nitrogen emissions, and low productivity per unit area, which leads to increased production costs.

As an alternative, to solve the problems of insufficient water resources and wastewater treatment generated by aquaculture farms, various circulating and filtering aquaculture systems that can maintain a stable water quality environment through water recycling and various water treatment processes are being commercialized.

Circulating filtration aquaculture systems offer higher density aquaculture and more energy-saving benefits than flow-through systems. Such systems focus on managing the water quality in the breeding tanks.

Typically, aquatic organisms are cultivated in a breeding tank, and suspended sludge (leftover food, excrement, etc.) generated in the breeding tank is allowed to freely fall and settle for a long period of time in a gravity-type settling tank for physical treatment. Harmful gases and substances that cannot be easily treated by physical methods, such as nitrogen and ammonia, are biologically decomposed and removed using aerobic microorganisms in a filtration tank, and the breeding water is then supplied back to the breeding tank for continued recirculation.

In gravity-type settling tanks used in conventional circulating filtration aquaculture systems, the specific gravity of the suspended sludge is not significantly different from that of the water, so sufficient settling requires an extremely large amount of usable surface area and takes a great deal of time, creating problems in terms of time and cost.

Korean Patent Publication No. 10-2017-0077610 discloses a fish farm using a high-density circulating filtration method, and Korean Patent No. 10-1489660 discloses a method for cultivating catadromous fish using a circulating filtration method and gradual seawater acclimation.

In addition, Korean Patent Publication No. 2020-0029691 discloses a high-density circulating filtration type aquaculture system. This circulating filtration type aquaculture system includes a breeding tank with a waste discharge outlet formed in the center of the bottom, a microbubble injector that generates a rotating water current in a certain direction in the breeding tank, a flocculation tank that injects a flocculant to separate the flocculated sediment from the supernatant, a sediment dewatering machine that removes the flocculated sediment, and a gravity-type sedimentation tank that separates the gravity sediment from the supernatant.

Korean Patent No. 10-1704970 discloses a freshwater snake eel farming device that uses magnetized water to increase growth and survival rates.

The conventional eel farming equipment described above administers a flocculant to the flocculation tank and allows the eels to settle by gravity, which reduces the efficiency of removing foreign matter, and the mortality rate of eels is relatively high due to poor purification of the suspended sludge generated during farming.

In particular, there is a problem in that it is not possible to select in advance eels that are close to death (immediately before death) from among the eels that are cultured at high density in breeding tanks. As it is not possible to select in advance eels that are infected with diseases that are close to death, there is a problem in that other eels in the breeding tanks become ill.

Korean Patent Publication No. 10-2017-0077610 Korean Patent No. 10-1489660 Korean Patent Publication No. 2020-0029691 Korean Patent No. 10-1704970

The present invention was made in consideration of the above problems, and the object of the present invention is to provide a cleaner unit that can quickly separate sick eels from those cultivated in breeding tanks, preventing the spread of disease and the death of eels, and a circulating filtration type high-density eel farming device that uses the same.

Another object of the present invention is to provide a cleaner unit that can prevent contamination of the water accumulated in the breeding tank and generation of gas by separating foreign matter, i.e., waste, generated from the breeding tank within a short period of time, and a circulating filtration type high-density eel farming device using the same.

Another object of the present invention is to provide a cleaner unit that can maximize the efficiency of eel farming by treating the water used for eel farming in multiple stages and adjusting the water quality, amount of dissolved oxygen, water temperature, etc., thereby maintaining the best breeding conditions, and a circulating filtration type high-density eel farming device using the same.

Another object of the present invention is to provide a cleaner unit that can quickly remove pollutants generated by eels cultivated in breeding tanks and simplify the post-treatment process of water used for cultivation, and a circulating filtration type high-density eel cultivation device using the same.

In order to solve the above problems, according to one aspect of the present invention,
a drain pipe with an inlet at the bottom of the breeding tank and an outlet at a position lower than the water level of the breeding tank, a cleaner body connected to the drain pipe, and a separation filter unit provided in the cleaner body for separating sick eels and foreign objects from the drainage water discharged through the drain pipe.
The cleaner is characterized by comprising a separation and discharge pipe connected to the cleaner body for discharging the discharged water from which the sick eels and foreign objects have been separated.

In the present invention, the separation filter unit is a cylindrical drum filter that is rotatable and tilted by support rollers provided in the cleaner body, and into which the discharged water discharged through the discharge pipe flows so as to separate sick eels from foreign objects carried on the discharged water; a drive unit for driving at least one of the support rollers to rotate the drum filter;
The drum filter is washed and a foreign matter discharge unit is provided for discharging filtered foreign matter to the outside.

The foreign object discharge unit is provided so as to be spaced a predetermined distance from the upper outer surface of the cylindrical drum filter, and is equipped with an injection nozzle section for injecting high-pressure cleaning water, a foreign object collection hopper having an inlet section that opens upward so that the cleaning water and foreign objects sprayed from the injection nozzle section provided on the inner peripheral surface of the drum filter corresponding to the injection nozzle section can flow in, and a foreign object discharge pipe that is connected to the foreign object collection hopper and discharges the cleaning water and foreign objects.

In order to solve the above problems, according to another aspect of the present invention,
At least one aquarium;
a discharge pipe with an inlet installed on the bottom of the breeding tank and an outlet installed at a position lower than the water level of the breeding tank; a cleaner main body connected to the discharge pipe; a separation filter unit provided in the cleaner main body for separating sick eels and foreign matter from the discharge water discharged through the discharge pipe; and a cleaner unit with a separation discharge pipe connected to the cleaner main body for discharging the discharge water from which the sick eels and foreign matter have been separated.
a circulation pipe connecting a separation discharge pipe of the cleaner unit and the breeding aquarium;
a first settling tank for precipitating foreign matter from the water discharged through the separation and discharge pipe, a foreign matter separation unit for removing foreign matter from the water in which settling has been carried out in the first settling tank, and a fixed filtration tank for adsorbing fine sludge contained in the water separated by the foreign matter separation unit and degassing ammonia;
The apparatus includes an ozone generator and dissolver that dissolves ozone in water that is returned through a circulation pipe after purification in a flowing type filtration tank for removing ammonia and nitrous acid from the water that has been filtered through a fixed type filtration tank, and sterilizes the water by dissolving the ozone in the water.

As explained above, the circulating filtration type high density eel farming device using the cleaner unit of the present invention makes it possible to farm eels in high density and purify the water for continuous use, thereby reducing space limitations for eel farming. In particular, it is possible to select sick eels from those farmed in the breeding tanks, thereby preventing the death of farmed eels.

In particular, the cleaner unit of the present invention can filter out foreign matter generated by farmed eels in the breeding tank before the discharge water is treated, making it possible to miniaturize the settling tank and fixed filter tank. It can also reduce the foul odor generated during the process of treating foreign matter, including eel waste.

FIG. 1 is a layout diagram showing a circulation filtration type high-density eel farming apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing the breeding tank of the circulation filtration type high-density eel farming apparatus according to the embodiment. FIG. 2 is a perspective view showing a cleaner unit of the circulation filtration type high-density eel farming apparatus according to the embodiment. FIG. 4 is a cross-sectional view of the cleaner unit shown in FIG. 3 . FIG. 2 is a perspective view showing a foreign matter separation unit of a circulation filtration type high-density eel farming apparatus according to an embodiment of the present invention. FIG. 6 is a cross-sectional view of the circulating filtration type high-density eel farming apparatus shown in FIG. FIG. 2 is a side view of a fixed filtration tank of a circulating filtration type high-density eel farming apparatus according to an embodiment of the present invention. FIG. FIG.

The preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. Note that in this specification and the drawings, components that have substantially the same components are given the same reference numerals to avoid duplicated explanations.

The outline of the configuration of a circulation filtration type high-density eel farming device according to an embodiment of the present invention will be described with reference to Figures 1 to 4.

Referring to the drawings, the circulating filtration type high density eel farming device 10 using the cleaner unit of the present invention comprises at least one breeding tank 20, a cleaner unit 30 installed in the breeding tank 20 to separate sick eels from the eels being farmed, and a circulation pipe 25 connected to the separation discharge pipe 39 of the cleaner unit 30 and the water supply pipe 21 installed in the breeding tank 20.

The system also includes a first settling tank 45, which is installed on the circulation pipe and is used to settle foreign matter from the water (hereinafter referred to as treated water) discharged through the separation and discharge pipe 35; a foreign matter separation unit 50, which is connected by a circulation pipe to the first settling tank 45 and filters the treated water from which the primary foreign matter has been removed by settling; a fixed filtration tank 60, which is used to adsorb fine sludge contained in the treated water separated by the foreign matter separation unit 50 and degas ammonia; a flowing filtration tank 70, which is used to remove ammonia and nitrite from the treated water filtered by the fixed filtration tank 60; and an ozone generator and dissolver 80, which is used to sterilize the treated water purified by the flowing filtration tank 70 using ozone.

The components of the circulating filtration type high density eel farming device according to the present invention, configured as described above, are described in further detail below.

The breeding tank 20 of the circulating filtration type high density eel farming device 10 using the cleaner unit of the present invention is open at the top as shown in FIG. 2, and has a structure in which the bottom surface is inclined toward the center of the breeding tank 20 of the water supply pipe. In addition, a water discharge pipe 22 is provided in the center of the breeding tank 20 to discharge water above a set water level. The breeding tank 20 can be made of polypropylene. This breeding tank 20 has the advantage of being easy to clean and maintain, as foreign matter in the tank does not easily adhere to it.

As shown in Figures 2 to 4, the cleaner unit 30 is capable of selecting sick eels from among the eels being cultured in the breeding tank 20, and is provided with a cleaner main body 32 installed inside the breeding tank 20. The cleaner main body 32 is designed so that a part of the cleaner main body 33 is submerged in the water of the breeding tank 20 so that water can smoothly flow into the inside of the cleaner main body 32 from a drain pipe 31 described below.

The cleaner main body 32 is provided with a separation plate 33 that separates a part of the internal space into upper and lower parts, and a separation filter unit 35 that is connected to the separation plate 33 and separates sick eels from foreign objects from the treated water flowing into the upper side of the separation plate 33 through the drain pipe 31. An inlet part 31a is installed on one side of the separation plate 33 at the bottom of the breeding aquarium 20, and a drain pipe 31 is installed to connect one side of the separation plate 33 to the discharge part 31b. In addition, the cleaner main body 32 is installed in the breeding aquarium 20 so that the separation plate 33, i.e., the discharge part 31b of the cleaner main body 32, is installed at a position lower than the water level of the breeding aquarium 20 as described above so that water can be smoothly discharged from the internal space through the drain pipe 31. A separation discharge pipe 39 that is connected to the circulation pipe 25 for purifying the treated water that has passed through the separation filter unit 35 is installed on the lower side of the cleaner main body 32.

The separation plate 34 at the portion connected to the drain pipe 31 may be a plate with a predetermined curvature so that sick eels discharged through the drain pipe 31 can slide without being damaged.

The separation filter unit 35 provided in the cleaner main body 32 is rotatably and inclined by a plurality of support rollers 36 provided in the cleaner main body 32, and includes a cylindrical drum filter 38 into which the discharged water discharged through the drain pipe 31 flows so that foreign objects carried on the treated water can be separated from sick eels, and a drive unit 36d for driving at least one support roller 36a of the support rollers 36 to rotate the drum filter 38. The cleaner main body 32 is provided with a foreign object discharge unit 40 for cleaning the drum filter 38 and discharging the filtered foreign objects to the outside.

The support roller parts 36 are each fixed to the cleaner body part 32 to rotatably hold the drum filter 38. The support roller parts 36 include a support roller 36a that is rotatably mounted on a holding bracket 36b fixed to the cleaner body part 32 and holds the outer peripheral surface of the drum filter 38, and an idle roller 39c that is mounted on the end side of the holding bracket 36b and holds the inner surface of the edge of the drum filter 38 held by the support roller 36a. The end of the support roller 36a, i.e., the end of the support roller 36a that corresponds to the edge of the drum roller 38, is provided with an annular locking claw that locks the end of the drum filter 38 to prevent the drum filter 38 from moving.

The drum filter 38 can be made of a cylindrical frame 38a with a mesh filter attached, and the mesh filter can be divided into multiple pieces. Support guides that hold the support rollers 36a are provided at both ends of the cylindrical frame.

The foreign matter discharge unit 40 is provided with a jet nozzle portion 41 for spraying high-pressure cleaning water, which is provided at a predetermined distance from the upper outer surface of the cylindrical drum filter 38, a foreign matter collection hopper 42 having an inlet portion with an open top so that the cleaning water and foreign matter sprayed from the jet nozzle portion 41 can flow in, which is provided on the inner peripheral surface of the drum filter 38 corresponding to the jet nozzle portion 41, and a foreign matter discharge pipe 43 connected to the foreign matter collection hopper 42 to discharge the cleaning water and foreign matter. The foreign matter collection hopper 42 is preferably provided at the same inclination angle as the cylindrical drum filter 38, and the foreign matter discharge pipe is preferably provided at the end side of the inclined foreign matter collection hopper 42. The inner peripheral surface of the drum filter 38 may be provided with a protruding ring (not shown) in the longitudinal direction so that the filtered foreign matter can be moved to the upper side of the foreign matter collection hopper 42. It is preferable that a continuous or discontinuous spiral ring is formed on the inner periphery of the drum filter 38 so that the eels discharged together with the treated water can be discharged through the drain pipe 31, and the eels can be discharged to the rear side of the drum filter 38. In this case, a separate chute for discharging the eels is provided at the part connected to the rear end side of the drum filter 38, although it is not shown in the figure.

The above-mentioned cleaner unit 30 has a drum filter of the foreign matter discharge unit 35 inclined on the cleaner main body (32), and the outlet 31b of the drain pipe 31 is located at a position lower than the water level of the breeding aquarium 20, so that the water in the breeding aquarium 20, i.e., the treated water, is discharged through the drain pipe 31 to the separation plate 33 and drum filter 38 side, and this discharged discharge water passes through the drum filter 38 rotated by the drive unit 35d, and is discharged through the separation discharge pipe 39 connected to the circulation pipe 25, and is purified and sterilized while holding the settling tank 45, fixed filter tank 60, fluidized filter tank 70, and ozone generator and dissolver 80 described later.

The treated water discharged through the drain pipe 31, which is adjacent to the discharge pipe 22 installed in the breeding tank 20 and has a discharge section 31b installed in the relatively deep central area, contains eel excrement, leftover feed, and relatively sickly eels.

To elaborate further, the eels have the habit of swimming in the opposite direction to the water flowing through the drainage pipe, and in particular to move upstream when moving through the pipe. However, relatively sickly eels are unable to resist the flow of water that flows in from the inlet 31a of the drainage pipe 31 and is discharged to the outlet 31b, and are discharged onto the top surface of the separator plate 33 of the cleaner unit and the inner surface of the drum filter 38 connected to it.

Many of the farmed eels are drawn into the drain pipe 31 and begin to swim, but the sick eels hitch a ride on the treated water discharged through the drain pipe 31 and are discharged to the separation plate 33 side.

As described above, the eels discharged onto the separation screen 34 are separated and managed separately.

As described above, foreign matter, including excrement from farmed eels, is carried in the treated water that passes through the drum filter 38 via the drain pipe 31 and is filtered by the drum filter 38. The excrement and foreign matter filtered by the drum filter 38 rotate together with the drum filter 38 inside the drum filter 38 and rise, and are collected in the foreign matter recovery hopper 42.

During this process, clogging of the drum filter 38 may occur. In this case, high-pressure cleaning water is sprayed from the spray nozzle 41 from the outer peripheral surface of the drum filter 38 to the inner surface, and the foreign matter inside the drum filter 38 and the foreign matter that was clogging the drum filter 38 flow into the foreign matter recovery hopper 42 together with the cleaning water, and then is discharged to the outside via the foreign matter discharge pipe 43.

The settling tank 45 is connected to the circulation pipe 25 so that the waste can flow in through the separate discharge pipe 35, and has a tank structure with an open top. The settling tank can be made of concrete.

In the breeding tank 20 for cultivating eels, waste and secretions generated by the eels and corroded feed are filtered by the foreign matter discharge unit 35 of the cleaner unit 30 as described above, so the settling tank 45 and the foreign matter separation unit 55 do not need to be installed separately, or their structure can be significantly reduced.

The settling tank 51 can eliminate the cause of primary putrefaction by settling and removing solid sludge such as fine excrement or powdered feed that has not been previously filtered by the foreign matter discharge unit 35 of the cleaner unit 30.

The foreign matter removal unit 50 removes fine sludge, i.e., fine sludge as small as 40 micrometers, from the aquaculture water from which solid sludge has been removed by the settling tank 51.

The foreign matter removal unit 50 may not be installed or may be relatively reduced in size as described above. As shown in FIG. 1, FIG. 5, FIG. 6, and FIG. 7, the unit includes a holding frame 56, a fixed shaft 57a fixed to the holding frame 56 and having a hollow structure, a drum rotatably connected to the fixed shaft 57a and into which the water to be treated flows and which is fitted with a filter mesh 57b held by a holding frame 57c supported by the fixed shaft 57a on its outer periphery, a rotary drive unit 58 for rotating the drum 57, a cleaning pipe 59a provided above the drum 57 and for spraying cleaning water from the outside to the inside of the drum 57 to remove foreign matter attached to the filter mesh 57b, a collection hopper 59b provided inside the drum 57 and receiving foreign matter detached from the filter mesh 57b by the cleaning water, and a holding pipe 59c connecting the fixed shaft 57a and the collection hopper 59b to form a passage through which the foreign matter flows into the inside of the fixed shaft 57a.

In the foreign matter removal unit 50 as described above, the water flowing in from the drum 57, i.e., the water to be treated flowing in from the settling tank 51, is filtered by the filter mesh 57b of the drum, and the foreign matter filtered by the filter mesh 57b flows into a collection hopper 59b connected to a fixed shaft 57a having a hollow portion. At this time, a cleaning pipe for discharging cleaning water is provided on the outside corresponding to the collection hopper 59b, so the foreign matter separated from the filter mesh by the cleaning water sprayed from this flows into the collection hopper and is discharged.

The fixed filtration tank 60 adsorbs and decomposes the water to be treated, from which fine sludge has been removed by the foreign matter removal unit 55, through ionization, and is used as an anoxic tank to degas ammonia.

As shown in Figures 7 to 9, the fixed filter tank 60 is used to adsorb and decompose sludge in the water to be treated and to degas ammonia in the water to be treated under oxygen-free conditions, and is provided in a form in which fixed filter media 65 are immersed and stacked in a filter tank 61 in which the water to be treated is stored.

As shown, the fixed filter media 65 of the present invention are stacked in multiple pieces using hanging ropes 62, and are suspended at a fixed position within the filter tank 61 by bundling the hanging ropes 62 with a stationary pipe 63 placed at the top end of the filter tank 61.

The fixed filter medium 65 is immersed and overlapped in the filter tank 61 in which the water to be filtered is stored, and is used to adsorb and decompose the sludge in the water to be filtered and to degas the ammonia in the water to be filtered. It comprises a base 66a in which a plurality of main holes 66b open to allow the treated water to pass are arranged at a distance from each other and sub-holes 66c open to allow the treated water to pass between the main holes 66b, and a main mesh body 66 protruding from one side of the base and formed in the inner area of the main holes 66b, and formed in a mesh shape so that the treated water can pass through and the sludge in the treated water can be adsorbed. It also comprises a sub-mesh body 67 protruding from the other side of the base 66a and formed in the area between the main holes 66b, and formed in a mesh shape so that the treated water can pass through and the sludge in the treated water can be adsorbed.

Meanwhile, as shown in FIG. 1, the flow-through filter tank 70 is connected to the fixed filter tank 60 by a circulation pipe, and a predetermined pattern of carriers is stored inside the flow-through filter tank 70 to treat the target water with microorganisms. An aeration pipe 71 for aeration is also provided in the flow-through filter tank 70.

This flow-through filter tank 70 accounts for approximately 70% of the water to be treated, and continuous aeration is performed to remove ammonia and nitrite using suspended solids and microorganisms attached to the carrier.

Meanwhile, the water to be treated that has been treated by the flow-type filtration tank 70 flows into the water quality adjustment tank 80. The temperature of the water to be treated that flows into the water quality adjustment tank 80 is adjusted by the heat exchanger 82 of the boiler 81 installed in the water quality adjustment tank. The water is then connected to an ozone generator and dissolver 90, and ozone is sprayed from the ozone generating nozzle 91 installed in the water quality adjustment tank 80 to sterilize the water to be treated. The ozone that has sterilized the water to be treated is then reduced to oxygen, increasing the amount of dissolved oxygen in the water to be treated.

The water to be treated, whose quality has been adjusted and sterilized by the water quality adjustment tank 80, passes through an oxygen dissolver 100 installed in the circulation pipe, and is then supplied to the inside of the breeding tank via the water supply pipe 21.

As described above, the cleaner unit of the present invention and the circulating filtration type high-density eel farming device using it can select and remove sick eels from those farmed inside the breeding tank, making it easy to manage the eels.

The water to be treated discharged from each breeding tank can be recycled by purifying and sterilizing it in multiple stages, enabling high-density farming and increasing production per unit area.

The above-described embodiment is intended to explain the present invention, and does not limit the scope of the present invention. In other words, the scope of the present invention is indicated by the claims, not by the embodiment. Furthermore, various modifications made within the scope of the claims and within the scope of the meaning of the invention equivalent thereto are considered to be within the scope of the present invention.

Claims (5)

a discharge pipe having an inlet at the bottom of the breeding tank and an outlet at a position lower than the water level of the breeding tank; a cleaner body connected to the discharge pipe; and a separation filter unit provided in the cleaner body for separating sick eels and foreign objects from the discharged water discharged through the discharge pipe.
A cleaner unit of a circulating filtration type high density eel farming device, characterized by comprising a separation discharge pipe connected to the cleaner main body for discharging discharge water from which sick eels and foreign matter have been separated. The separation filter unit includes a cylindrical drum filter that is rotatable and inclined by support rollers provided in the cleaner body, into which the discharged water discharged through the discharge pipe flows so as to separate foreign objects and sickly eels carried in the discharged water, and a drive unit for driving at least one of the support rollers to rotate the drum filter,
The cleaner unit of the circulating filtration type high-density eel farming apparatus as described in claim 1, further comprising a foreign matter discharge unit for cleaning the drum filter and discharging filtered foreign matter to the outside. The cleaner unit of the circulating filtration type high density eel farming device described in claim 2, characterized in that the foreign matter discharge unit comprises: an injection nozzle section that is installed at a predetermined distance from the outer surface of the upper side of the cylindrical drum filter and sprays high-pressure cleaning water; a foreign matter collection hopper that has an inlet section that is open at the top so that the cleaning water and foreign matter sprayed from the injection nozzle section installed on the inner peripheral surface of the drum filter corresponding to the injection nozzle section can flow in; and a foreign matter discharge pipe that is connected to the foreign matter collection hopper and discharges the cleaning water and foreign matter. At least one aquarium;
a cleaner unit including an inlet provided at the bottom of the breeding tank and a discharge pipe with a discharge outlet provided at a position lower than the water level of the breeding tank, a cleaner main body connected to the discharge pipe, a separation filter unit provided in the cleaner main body for separating sick eels and foreign matter from the discharge water discharged through the discharge pipe, and a separation discharge pipe connected to the cleaner main body for discharging the discharge water from which the sick eels and foreign matter have been separated;
a circulation pipe connecting a separation discharge pipe of the cleaner unit and a breeding aquarium;
a first settling tank provided on the circulation pipe for settling foreign matter from the water discharged through the separation and discharge pipe, a foreign matter separation unit for removing foreign matter from the water in which settling has been performed in the first settling tank, and a fixed filtration tank for adsorbing fine sludge contained in the water separated by the foreign matter separation unit and degassing ammonia;
This is a high-density eel farming system using a circulating filtration cleaner unit, characterized by including an ozone generator and dissolver that dissolves ozone into the water that is returned through a circulation pipe after purification in a flowing filtration tank to remove ammonia and nitrite from the water that has been filtered through a fixed filtration tank. The separation filter unit is a cylindrical drum filter that is rotatable and tilted by support rollers provided in the cleaner body, and into which the discharged water discharged through the discharge pipe flows so as to separate foreign objects and sick eels carried in the discharged water; a drive unit for driving at least one of the support rollers to rotate the drum filter;
A circulating filtration type high density eel farming device using a cleaner unit as described in claim 4, characterized in that it is equipped with a foreign matter discharge unit for cleaning the drum filter and discharging filtered foreign matter to the outside.

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