JP2012239414A - Water treatment apparatus for culture pond - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat the contamination of water utilizing a dead space at the center of a culture pond.SOLUTION: This water treatment apparatus for a culture pond includes a water cultivation apparatus 15 with a rotating arm 16 provided with paddle blades 20, floating on the water surface; a carbon fiber filter material 6 provided inside a wall surface part 3; a sludge collecting strainer 9 provided at a bottom part 5; a tower tank 10 storing inside biofilters 11 and having a large number of protrusions on the surfaces and floating by air; and air ejectors 23, 32 disposed inside and outside the tower tank 10 to eject air from an air source, and installed at the center of the pond. A separation chamber 40 connected to the strainer through a connecting pipe 39 is provided below an auxiliary filtration tank 35 storing a biological filter material 37 formed by laminating glass foam filter materials having a large number of pores in the surfaces, and an air lift 48 for feeding treated water to the culture pond is provided at the upper part of the biological filter material.

Description

The present invention relates to a water treatment apparatus that treats dirty breeding water in a farm for culturing fish and carp in a closed circulation manner.

Conventional aquaculture ponds become sludge that becomes a causative substance of anaerobic environment by remaining unprocessed food by fish and shrimp, salmon, etc. Deposit at the bottom of the aquaculture pond. Therefore, oxygen in the air is taken into the water, and the water wheel installed on the surface of the water is rotated at a high speed to dissipate the water on the water surface to take in the oxygen in the air, and the dissolved oxygen (DO) value in the water is A method of maintaining a certain value or more is generally performed.

As shown in FIG. 5, the water wheel 51 installed on the water surface of the conventional aquaculture pond 50 rotates the impellers 53 and 53 at a high speed by rotating the motor 52 to stir the water surface of the aquaculture pond. Oxygen in the atmosphere is taken into the water while standing and forming the undulations 54 and 54 continuously in the circumferential direction on the water surface. Furthermore, in order to clean the dirty water, a treatment tank 55 for treating the dirty water is required in addition to the aquaculture pond 50, which has the disadvantage of increasing the capital investment cost.

Since the water wheel 53 for agitation of the water surface rotates at high speed in a direction perpendicular to the water surface, the water on the surface of the water is lifted upward and dissipated in the air, so that the motor is required to have a large force. In addition to the generation of large noise caused by stirring water, the amount of power consumption increases, which is extremely uneconomical.

As an apparatus for increasing the dissolved oxygen level in the aquaculture pond, there is an apparatus that rotates an impeller installed on the surface of the water to diffuse water into the air and mix air in the air (see Patent Document 1). ). Furthermore, by rotating the impeller horizontally along the water surface of the pond, water that contains a lot of oxygen on the water surface is pushed out from the center of the pond in the centrifugal direction, and when this water passes through the filter medium, There is one that supplies oxygen contained in water to microorganisms adhering to a filter medium, and activates the microorganisms to decompose water stains (see Patent Document 2). However, even though conventional water turbines can cause convection on the surface of the pond, it has been difficult to raise the water deficient in oxygen drifting at the bottom of the pond to the water surface.

Furthermore, by rotating an impeller installed on the water surface of the aquaculture pond along the water surface, a water flow is generated on the water surface of the pond, while an air blower is installed on the lower water bottom where the impeller is located, In addition to activating the aerobic microorganisms floating in the water by blowing air from the air source into the water and activating it, there are also water treatments that generate an upward water flow at the bottom of the pond center (patent document) 3, see). However, aerobic microorganisms in microorganisms are not always concentrated in the upper part of the air ejection part, and it is difficult to supply oxygen to the microorganisms if they are gathered in places where air is difficult to reach. Met.

The soil in the breeding water can be freshly synthesized by applying sunlight to the aerobic microorganisms floating in the water by sterilizing microorganisms with ultraviolet rays or attaching them to filter media installed in the pond. This is done by supplying water to activate aerobic microorganisms. In addition, it is necessary to involve many microorganisms such as bacteria and protozoa, that is, aerobic microorganisms, in the decomposition of organic matter deposited on the bottom of the pond, generally called sludge. And it is said that the aerobic microorganism activated in the environment where oxygen is abundant has the decomposition efficiency of 100 times or more of the anaerobic microorganism which exists abundantly in the environment where oxygen is low. Therefore, the amount of sludge that can be decomposed in one day if oxygen is present is said to take 100 days if oxygen is insufficient.

Japanese Patent Publication No. 51-46986 Japanese Patent No. 3360075 JP 2010-88315 A

In order to solve the above-mentioned problems, the present invention has first and second air ejectors installed inside and outside the tower tank installed at the center of the pond, respectively, and air is supplied from the air ejectors installed in the tower tank and the outer circumference of the tower tank. When the bubble is blown out, upward convection occurs in the center of the pond, and oxygen is supplied to activate the water, and the rotating arm is slowly rotated to make the water surface rippling into fresh water that has taken in atmospheric air. , By generating large convection of water in the horizontal and vertical directions throughout the pond, activating aerobic bacteria to suppress the growth of anaerobic bacteria, photosynthesis by sunlight, and bad bacteria in the water by ultraviolet rays from the sun It kills (pathogenic bacteria) and accelerates decomposition.

The conventional pump has a drawback that a difference is generated between a place where water is strong (water surface part) and a place where water is weak (water bottom part) in the pond. However, according to the present invention, in order to rotate the motor slowly, an air blower is installed on the bottom of the bottom where convection is weak, using about 1 / 40th of the energy of a conventional pump, and the air is forcibly ejected to generate an upward flow. By generating convection in the bottom water that was impossible with conventional pumps, the water quality of the pond and the bottom (DO, PH, BOD) of the aquaculture pond is not made different, and the water quality of the pond is uniform. I was able to.

In addition, in this type of conventional device, fish droppings and food residue settled on the bottom of the water and remained as sludge, but this device is equipped with a strainer installed at the bottom of the aquaculture pond, an auxiliary filtration tank, The sludge in the culture pond is automatically moved to the separation chamber provided in the auxiliary filtration tank by using the natural head of the connecting pipe connecting the sludge so that the sludge does not remain in the culture pond.

Furthermore, using the dead space at the center of the aquaculture pond, a large number of microorganisms adhere to the surface of a small lightweight material such as foamed plastic with a large number of small holes in the tower tank installed in the space. A large number of fluid carrier filter media having living membranes formed in this manner are accommodated in a movable manner. And by supplying air bubbles to the aerobic microorganisms adhering to the surface of the fluid carrier filter medium that freely flows in the tower tank by aerating air bubbles from the first air blower provided at the inner bottom of the tower tank After being activated, this treated water exits from the tower tank and flows into the center of the pond.

The sludge collected on the strainer installed at the bottom of the aquaculture pond automatically moves to the auxiliary filtration tank due to the natural drop of the connecting pipe, and is separated from the water by the specific gravity difference in the separation chamber provided in this auxiliary filtration tank. The sludge is collected by the sludge treatment device and used effectively. Furthermore, the treated water that has been highly biologically treated with the biological filter material in the auxiliary filtration tank is returned to the culture pond by an air lift.

In order to achieve the above-mentioned object, the present invention is a cultivated water attached to a support column 13 established at the bottom by floating a rotary arm 16 provided with water blades 20 at the lower ends of a plurality of arms 17 arranged in a radial direction. Machine 15, carbon fiber filter medium 6 provided with a gap 4 inside wall surface 3, sludge collecting strainer 9 provided on bottom 5, and wall surface 3, and a downward slope in the central direction. Is installed in the center of the aquaculture pond having the bottom part 5 and accommodates in the inside a tower tank 10 in which the biofilter 11 that flows by air bubbles is housed, and a biological filter material 37 formed by laminating glass foam filter media. A separation chamber 40 communicating with the strainer is provided below the auxiliary filtration tank 35, and an air lift 48 for returning the treated water treated with the biological filter material to the aquaculture pond is provided at the upper part of the auxiliary filtration tank. Installed first and second The air jets 23 and 32 and the air source 26 are connected, and the sludge separated from the water using the specific gravity difference in the separation chamber 40 is transferred to the sludge treatment device 42 through the drain pipe 41 by valve operation to remove the sludge. To do. Further, the biofilter 11 has a large number of protrusions on the surface so that microorganisms can easily adhere to it, and a large number of fluid carrier filter media 11 a provided in an arbitrary shape with a lightweight material such as plastic in the tower tank 10. It is formed so as to be able to flow. Furthermore, the biological filter medium 37 accommodated in the auxiliary filter tank 35 is formed by laminating glass foam filter mediums having a large number of small holes on the surface so that microbes in the water can adhere to each other. . Furthermore, a nanocarbon heater 50 on the outer peripheral surface of the wall surface portion 3 is mounted.

A carbon fiber filter material is attached inside the wall of the aquaculture pond, and the rotating arm of the cultivator floated on the surface of the water rotates to push water from the center of the pond in the centrifugal direction. The oxygen-deficient water is raised, oxygen in the atmosphere is taken up on the water surface, and bad bacteria in pollutants are sterilized by ultraviolet rays from the sun. Moreover, the biofilter in which microorganisms adhere to the fluid carrier filter medium is activated by the air ejected from the first air ejector in the tower tank.

In addition, an air bubble blown upward from an air blower installed at the bottom of the pond to supply oxygen to oxygen-deficient water so that fish droppings and residual food that cause anaerobic sludge do not accumulate at the bottom. Generate upward convection in the center of the pond. In addition, since the rotating arm on the water surface rotates slowly, a motor having a smaller force than that of a conventional water wheel can be used, so that the power consumption can be reduced and the operation can be quietly performed without generating a large noise.

The strainer provided at the bottom of the pond is connected to the separation chamber provided at the bottom of the auxiliary filtration tank having a biological filter material for performing advanced biological treatment with a connecting pipe, and the sludge collected in the strainer uses a natural head. The sludge separated by utilizing the difference in specific gravity accumulates at the bottom of the separation tank, and when a certain amount of water accumulates, the valve opens, and the water containing sludge is transferred to the sludge treatment device, and the sludge is compressed. Dry it into plant fertilizer. Wastewater from which sludge has been removed is drained into the sewer system, for example, in an authorized municipality. Moreover, when it is not permitted, it will drain after processing as needed. Furthermore, the treated water that has been highly biologically treated with the biological filter material in this auxiliary filtration tank is returned to the culture pond by an air lift.

The present invention spouts air bubbles from the air outlets installed inside and outside the tower tank installed in the center of the bottom of the pond, generates a water flow above the center of the pond and generates a water flow in the radial direction on the water surface, Convection is generated in the entire pond, and oxygen is supplied from the air bubbles to water deficient in oxygen drifting at the bottom of the water. In addition, a biofilter made of a fluid carrier filter medium with aerobic microorganisms attached to the surface in a tower tank is stored in a flowable manner to perform aeration, supply oxygen to the aerobic microorganisms, and a rotating arm floating on the water surface. The water is generated in the horizontal direction by slowly rotating the carbon fiber filter material attached inside the wall surface of the peripheral edge, activated by supplying oxygen to the aerobic bacteria, and residual food and feces in the aquaculture pond. Do not stop. Since this biofilter flows freely in the tower tank and does not become dirty, there is no need to perform maintenance and inspection on the fluid carrier filter medium.

It is the schematic diagram which made the water treatment apparatus installed in the culture pond the longitudinal section. It is a principal part expanded sectional view which attached the 1st, 2nd air ejector to the inside and outside of the tower tank installed on the strainer provided in the bottom part of the pond. It is an AA line expanded sectional view of FIG. It is a top view which shows the generation | occurrence | production state of the ripple part which the rotation arm of the water cultivator installed in the water surface of a culture pond turns around and produces on a water surface. It is a top view of the state which installed and rotated two conventional waterwheels in an aquaculture pond.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a vertical section of a water treatment device installed in an aquaculture pond, and FIG. 2 shows the inside and outside of a tower tank installed on a strainer provided at the bottom of the pond. Fig. 3 is an enlarged sectional view in the direction of the line A-A in Fig. 2, and Fig. 4 is a rotary arm of a water cultivator installed on the water surface of the aquaculture pond. It is a top view which shows the state of the swirl flow which arose on the water surface by the winding. Reference numeral 1 denotes an aquaculture pond having an arbitrary shape such as a circular shape or a substantially rectangular shape that contains water for breeding, and is formed of an inexpensive synthetic resin material such as polypropylene. A carbon fiber filtering material 6 is provided along the inside of the wall surface 3 of the culture pond, and first and second air ejectors 23 and 32 are installed inside and outside the tower tank 10 installed at the center of the pond. It is.

The aquaculture pond 1 having a bottom 5 continuous to the wall surface 3 is formed in a downward slope toward the center of the aquaculture pond, and suspended matter such as residual fish and feces floating near the bottom of the water gradually move along with the movement of water. Gather at the bottom of the slope. In the deep part of the center of the bottom part 5, there is provided an outlet 8 for transferring sludge accumulated on the bottom of the water, such as suspended matter, to the outside of the aquaculture pond, and a mesh wall 9a is provided so that fish in the pond will not enter. A strainer 9 is installed in communication with the take-out rod 8. A plurality of strainers 9 may be provided on the bottom 5 of the pond depending on the size or shape of the pond.

The rotating arm 16 installed on the water surface 1a of the aquaculture pond 1 has three arms with buoyancy to float on the water surface, which are radially connected at equal intervals. A water cultivator 15 is formed by installing a motor 15 at the center. The rotating arm 16 connected to the motor 15 rotates at a slow speed of, for example, 3 to 10 times, preferably 5 to 6 times per minute, so that the motor is small and consumes less power. doing.

The rotating arm 16 is slowly pushed out from the center of the aquaculture pond toward the periphery by the rotation of the rotating arm 16, and the undulating portion 21 provided on the water surface flows in a radial direction while swirling the water surface, taking oxygen in the atmosphere into the water. Sterilize bad bacteria with ultraviolet rays from the sun, and grow and activate aerobic microorganisms by photosynthesis. The water blades 20 and 20 are vertically suspended at the lower end of each arm 17 constituting the rotating arm 16 so that the water can be efficiently pushed out radially to effectively form the waved portion 21 on the water surface. . Here, an aerobic bacterium (bacteria) activated in an environment where a large amount of oxygen exists has a decomposition efficiency 100 times or more that of an anaerobic bacterium activated in an environment where there is little oxygen.

A gap 4 is provided inside the wall 3 and a fixed filter medium 6 is installed around the entire circumference or at constant or arbitrary intervals, and the flow of water to the back side of the filter medium 6 through the gap becomes good. It grows and activates aerobic microorganisms floating in the water. The carbon fiber filter material 6 has a large surface area and a biofilm, and its high elasticity maintains a space between the fibers for a long period of time, so that the attachment of microorganisms and water can be stably performed. Distribution can be ensured. This filter medium 6 also has a pollutant supplementing ability for removing dust floating in water.

13 is a long support, which is installed at the center of the aquaculture pond with a cultivator 15 attached to the upper part. The lower part of the support is formed in a tenu or three-way shape, and the central part is lifted high, Since the support leg piece 14 is fixed to the center upper surface of the support leg piece 14 having a space between the support leg piece 5 and the center part of the support leg piece 14 is lifted, the outlet 8 is not closed at the lower end of the support column 13.

10 is a substantially cylindrical tower tank installed in the dead space at the center of the aquaculture pond, and has a perforated lid plate 10a and a perforated bottom plate 10b each having a large number of small holes on the upper and lower surfaces. The pond water can flow in and out, and the inner bottom of the tower tank has a number of small pipes on the surface of a pipe formed in an arbitrary shape such as an annular shape, U shape, or spiral shape. A first air ejector 23 having a hole is provided (FIG. 3 is formed in an annular shape, but is not limited to this shape). The air ejector 23 is connected to an air source 26 such as a compressor or a blower via a first pipe 24.

A large number of biofilters 11 that freely flow by air bubbles ejected from an air ejector are accommodated in the tower tank 10. This biofilter 11 has a large specific surface area by providing a large number of protrusions on the surface of a fluid carrier filter medium 11a formed in a small and arbitrary shape using a lightweight material such as a lightweight foamed plastic. Purify water stains using living organisms that form a living membrane formed by microorganisms. Since the fluid carrier filter medium 11a freely flows in the tower tank 12 by air bubbles, even if remaining food or feces are clogged, it always flows during operation. Therefore, there is an advantage that maintenance is unnecessary.

In addition, a second air ejector 32 that has a large number of small holes on the surface of the annularly formed pipe and generates air bubbles is installed at the bottom of the pond around the tower tank. It is connected to the air source 26 via two pipes 31.

35 is an auxiliary filtration tank containing a biological filter material 37 inside, and a separation chamber 40 for separating sludge from water using a specific gravity difference between water and sludge is provided at the bottom of the auxiliary filtration tank. A drain pipe 41 connected to the chamber is connected to a sludge treatment device 42.

The biological filter medium 37 is made of a glass foam filter medium having a large number of small holes on the surface, and microorganisms that are living organisms formed by attaching underwater microorganisms to the surface of each member, particularly aerobic microorganisms. Water is purified by growing and aerobic aerobic bacteria by supplying oxygen to the water and performing advanced biological treatment.

The strainer 9 installed in the aquaculture pond is connected to the separation chamber 40 by a connecting pipe 39, and is automatically transferred from the strainer 9 to the separation chamber 40 using a natural head. When the sludge in the separation chamber reaches a certain amount, the sensor 41b provided in the separation chamber senses it, opens the valve 41a provided in the drain pipe 41 and transfers it to the sludge treatment device 42, and is provided in the sludge treatment device 42. The sludge is collected and removed from the sewage using a compressor, dryer, etc., repeatedly compressed, dried, and processed into plant fertilizers such as watercress.

The bottomed tube 45 installed above the auxiliary filtration tank 35 is attached with its upper end positioned slightly above the upper surface plate 36a, and further, one end positioned above the water surface of the aquaculture pond and arranged substantially horizontally. The lower end of the vertical pipe 46a formed by bending the other end of the water supply pipe 46 downward is positioned at a substantially middle portion in the bottomed cylinder. The lower end of the air supply pipe 25 connected to the second branch portion 24c of the first pipe 24 connected to the air source 26 via the second valve 25a is in the middle of the vertical pipe 46a or near the lower end. The treated water 1b accumulated in the upper part of the auxiliary filtration tank 35 is returned to the culture pond 1 by the air lift 48 that is positioned.

Next, the operation of the present embodiment will be described. The cultivator 18 installed on the surface of the aquaculture pond 1 containing a large number of fishes and the air source 26 are connected to external power to rotate the rotary arm 16 of the cultivator. The air bubbles are blown into the water from the first and second air blowers 23 and 32 installed inside and outside the tower tank 10 provided in the center of the culture pond through the pipes 24 and 31, respectively. It is something to be made.

Air bubbles are ejected from the first air ejector 23 into the tower tank 10 to perform aeration. The fluid carrier filter medium is freely flowed by the water flow generated by the air bubbles ejected to a large number of fluid carrier filter media 11a constituting the biofilter 11 movably accommodated in the tower tank, and the fluid carrier filter media is formed on the surface of the fluid carrier filter media. Oxygen contained in the air bubbles is supplied to the living membrane formed by adhesion. When oxygen is supplied from an air bubble, aerobic microorganisms grow and are activated.

A biofilter 11 having a living membrane with microorganisms attached to the surface of a large number of protrusions provided on the surface of a large number of fluid carrier filter media 11a movably accommodated in the tower tank 10 is the filter media. Instead of acting at a fixed position as in Fig. 6, it is allowed to grow by supplying oxygen to bacteria, protozoa, and other microorganisms attached to the biofilter, in particular aerobic microorganisms, while flowing freely in the tower tank by water flow To activate.

Water deficient in oxygen near the bottom of the water contains a large amount of anaerobic microorganisms, and flows into the tower tank 10 and is supplied with air bubble oxygen that is ejected from the first air ejector 23. Oxygen is supplied to the aerobic microorganisms attached to the surface of the filter 11 and activated, and the activated water flows into the water surface at the center of the pond outside the tower tank.

In addition, the air bubbles ejected from the second air ejector 32 installed outside the tower tank 10 supply oxygen to water deficient in the presence of sludge such as fish filth and residual food in the vicinity of the bottom. An upward flow of water is generated in the center of the pond where there is little convection due to the eruption of bubbles, thereby causing the action of drawing unfiltered water drifting near the bottom of the wall surface toward the center of the pond.

The rotary arm 16 of the cultivator rotates relatively slowly while ascending to the surface of the water, and the corrugated portion 21 generated by pushing water on the surface of the water in the radial direction takes oxygen in the atmosphere into the water and also in sunlight. Sterilize bad bacteria in water with UV light. The water at the center of the pond is pushed out in the centrifugal direction by the rotation of the rotating arm. The water pushed out in the radial direction by the rotary arm 16 supplies fresh water to the filter medium 3 provided inside the wall surface portion 3 and supplies oxygen to aerobic microorganisms adhering to the filter medium. Turn into. Since the filter medium 6 is a carbon fiber, its high elasticity maintains a space between the fibers for a long period of time, so that the attachment of microorganisms and the flow of water can be secured stably.

Further, one of the air supplied from the air source 26 ejects air bubbles into the water from the first air ejector 23 installed at the bottom of the tower tank 10 through the first pipe 24 via the branch portion 24b. The biofilter 11 made of the fluid carrier filter medium 11a accommodated in the tower tank and having a large number of microorganisms attached to the surface thereof is caused to flow. In addition, the other air valve supplied from the air source 26 allows air bubbles to flow into the water from the second air ejector 32 installed outside the tower tank 10 located at the bottom of the culture pond through the second pipe 31. Spouts to generate an upward water flow in the center of the pond, and oxygen-deficient water drifting near the bottom is drawn into the pond center to supply oxygen, and aerobic microorganisms contained in the water are grown and activated Water is raised to the surface.

Due to the convection of water on the surface of the aquaculture pond, the suspended fish such as residual food and feces descends over time, move along the slope of the bottom 5 to the center bottom of the pond, and enter the strainer 9 from the mesh wall 9a. Collected. Sludge collected in the strainer 9 automatically moves into the separation chamber 40 using the natural head of the connecting pipe 39. When sludge separated from water accumulates in the separation chamber over time, the sensor 40a senses it, and opens the valve 41a provided on the drain pipe 41 to send water containing sludge to the sludge treatment device 42. The sludge treatment device 42 removes moisture by squeezing the sludge with filter means for removing dust contained in the water, and further compressing the sludge with the compression means and squeezing the moisture to dry the powder, soot, etc. It is formed into an arbitrary shape and used as a fertilizer for plants such as watercress.

The water in the separation chamber 40 is activated by being highly biologically treated by a biological filter medium 37 provided in the auxiliary filtration tank 35, and the water level of the treated water 1b sent above the auxiliary filtration tank is the bottomed cylinder. If the upper end of 45 is exceeded, it will be sent into the bottomed cylinder. In the bottomed cylinder, a vertical pipe 46a provided continuously with the other end of the water supply pipe 46 located at the top of the aquaculture pond, and a first pipe 24 connected to the air source 26 via a branch portion. The treated water in the vertical pipe 46a in the bottomed cylinder is supplied by the air blown from the tip of the air supply pipe 25 by the air supplied from the air source 26 by the air lift 48 constituted by the air supply pipe 25. The treated water in the bottom cylinder can be raised into the vertical pipe and returned to the culture pond 1 from the tip of the water supply pipe 46.

When the rotary arm 16 rotates, the surface water of the pond is formed in the water surface portion by forming the wave surface 21 while pushing out radially from the center of the rotary arm by the water blades 20 provided on the arm. Incorporates oxygen in the air to increase the dissolved oxygen (DO) value, promotes photosynthesis by sunlight, and sterilizes germs in the suspended matter contained in water by ultraviolet rays. In this way, it is activated by supplying oxygen to aerobic bacteria of microorganisms contained in water and growing them, and suspended matter such as residual food and feces that cause sludge is reduced by the action of aerobic microorganisms. Grows and activates aerial microorganisms.

Water deficient in oxygen at the bottom of the pond rises up the center of the pond by air bubbles ejected from the air blower, while water deficient in oxygen takes oxygen from the air bubbles in the water and oxygen on the water surface. At the same time, the photosynthesis of plankton in the water is activated by sunlight, and the bactericidal effect by ultraviolet rays is obtained. Water that contains enough dissolved oxygen (DO) comes into contact with fish dung and residual food that causes sludge, which is an anaerobic environment in the bottom of the pond. Water quality is improved by growing effective microorganisms. In this way, the surface water rich in dissolved oxygen is sent to the bottom of the oxygen deficient and the water in the pond is circulated, so that the water quality becomes uniform and the oxygen-containing water is supplied to the bottom as well. Generation of sludge can be prevented by activation of. The air source 26 and the rotary arm 18 of the tiller operate all day.

Of course, instead of a sensor that operates a valve for discharging sludge from the separation chamber 40 to the sludge treatment device 42, a timer may be provided so as to operate at regular intervals. Furthermore, by attaching the nanocarbon heater 50 to the wall portion of the culture pond made of polypropylene, far-infrared rays can be generated while photosynthesis is carried out indoors to further promote the growth of fish. In addition, the aquaculture density is about 3 to 5 times that of conventional equipment, and the aquaculture efficiency is further improved. In addition, there is a feature that the cost required for maintenance of the apparatus can be further reduced.

DESCRIPTION OF SYMBOLS 1 Culture pond 3 Wall part 4 Gap part 5 Bottom part 6 Filter material
DESCRIPTION OF SYMBOLS 9 Strainer 10 Tower tank 11 Bio filter 11a Fluid carrier filter medium 13 Support | pillar 16 Rotating arm 18 Water tiller 20 Water blade 23 First air ejector 24 First pipe 25 Second air supply pipe 26 Air source 31 Second pipe 32 Second air ejector 35 Auxiliary filtration tank 37 Biological filter material 39 Connecting pipe 40 Separation chamber 41 Drain pipe 42 Sludge treatment device 48 Air lift

Claims (4)

A cultivator (18) in which a rotating arm (16) provided with water blades (20) at the lower ends of a plurality of arms and arranged in a radial direction is attached to a support column (13) established on the bottom by floating on the water surface; The carbon fiber filtering material (6) provided with a gap (4) inside the wall surface (3), the sludge collecting strainer (9) provided on the bottom (5), and the wall surface (3 ) And a tower tank (10) installed in the center of the aquaculture pond having a downwardly inclined bottom (5) in the center direction and containing a biofilter (11) that flows by air, and a glass foam filter medium A separation chamber (40) communicating with the strainer is provided below the auxiliary filtration tank (35) in which the biological filter material (37) formed by laminating is disposed, and treated water treated with the biological filter material (37) is provided. An air lift (48) for returning to the aquaculture pond is placed above the auxiliary filtration tank (35). The first and second air ejectors (23, 32) installed inside and outside the tower tank (10) are connected to the air source (26) and connected to the strainer (9) via a connecting pipe (39). A water treatment device for an aquaculture pond, wherein sludge separated from water using a specific gravity difference in the separation chamber (40) is transferred to a sludge treatment device (42) through a drain pipe (41). The biofilter (11) has a large number of protrusions on its surface so that microorganisms can easily adhere to it, and a large number of fluid carrier filter media (11a) formed into an arbitrary shape with a lightweight material such as plastic. 2. The water treatment apparatus for an aquaculture pond according to claim 1, wherein the water treatment apparatus is accommodated in a flowable manner. The biological filter material (37) accommodated in the auxiliary filtration tank (35) is formed by laminating glass foam filter materials each having a large number of small holes on the surface so that microorganisms in the water can adhere thereto. The water treatment device for an aquaculture pond according to claim 1. The water treatment apparatus for an aquaculture pond according to claim 1, wherein a nanocarbon heater (50) is attached to the outer peripheral surface of the wall surface portion (3).

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