TW201617289A - Method and system for aquaculture and plant cultivation by combining circulating water - Google Patents

Abstract

A method for aquaculture and plant cultivation by combining circulating water is implemented by sending overflow water on the upper level of a culture tank and polluted water on the bottom of the culture tank to a circular plate ultrafiltration membrane unit and a protein separator, respectively. In the protein separator, gas and liquid are mixed to form a bubbled hybrid solution, which is filtered by passing a membrane and separated from bubbles to form a water body flowing into the culture tank to form circulating water. Then, the bubbled hybrid solution and the concentrated waste liquid intercepted by the membrane filtration are sent to a foam collecting tank for standing fermentation to become culture waste water. The culture waste water passes through another circular plate ultrafiltration membrane unit to be separated into a primary filtrate and a turbid high protein concentrate. Finally, the primary filtrate is pumped to a nanofiltration membrane unit to remove ammonia nitrogen so as to obtain a recycling water rich in amino acid and a clear high protein concentrate. The recycling water is then pumped back to the culture tank for reuse.

Description

Method and system for aquaculture and plant cultivation combined with circulating water

The invention relates to a method for treating water, and particularly relates to a method for improving the recovery efficiency of circulating water, thereby reducing the amount of water used for supplementing aquaculture, and separating high protein concentrate from the aquaculture wastewater to provide a plant factory. A method of aquaculture and plant cultivation in combination with circulating water for nutrients required for plant cultivation.

With the gradual depletion of offshore fishery resources and the development of offshore fisheries, domestic fisheries have gradually turned into aquaculture development in recent years. However, due to the small land area in Taiwan and the problem of subsidence caused by over-pumping groundwater, traditional aquaculture methods have been adopted. This has caused a huge bottleneck in farming, so a closed-end recirculating aquaculture system has emerged.

To this end, the invention patent application No. 101496697 "Processing equipment for high-density culture circulating water" previously filed by the inventor of the present invention discloses a recirculating aquaculture system, which firstly The water inlet equipment is driven into the culture tank, and the aquaculture tank is provided with aeration equipment to provide sufficient oxygen, and an overflow raft is arranged in the tank to connect to a circulating water purification device, and the purified and filtered water liquid is returned to the tank. It is recycled in the culture tank. Therefore, it is basically necessary to add about 10% of the water volume of the culture water to the tank every week to achieve continuous water circulation.

In addition, in order to reduce the ammonia nitrogen concentration in the culture tank to improve the survival rate of the feed, the inventors of the present invention further in the circulating water purification equipment (UF membrane filtration list) Before the use of a bubble separator to replace the original embedded nitrifying bacteria, the foam adsorption separation method is used to pre-removal the colloidal mucus (protein) and suspended particles in the water body, on the one hand, the filter membrane is protected from the fish body. The secreted mucus is clogged to maintain the solid-liquid separation efficiency of the filter. On the other hand, it can also add more oxygen in the water to provide excellent circulating water quality, improve the survival rate of the feed, and extend the filter. Cleaning cycle and service life.

Although the above design has been able to achieve the purpose of intensive farming with circulating water, after a period of actual operation, the inventor of the case found that the existing design is still slightly insufficient for the recycling performance of circulating water. point:

First, in addition to the small amount of aquaculture water that is naturally evaporated, most of it is discharged by the bubble separator when removing protein from the water (most of the foam produced by the bubble separator is still It is water and liquid), so the current recirculating aquaculture industry must replace at least 10% of the aquaculture water every day to solve this problem. Although this figure does not seem big, it is representative for a breeding business with 30 tons of water or more. It is necessary to discharge 3 tons of aquaculture wastewater in the week and replenish the clean water. In the long run, this is obviously a small cost burden.

Secondly, the previous circulating aquaculture system has a spray unit to spray the filter membrane of the purification equipment, and although the water source during the spray is taken from the circulating water on the return pipe, it is entrained after rinsing the filter. The spray water with a large amount of sludge, because the turbidity and suspended solids (SS) values are too high, usually can only be directly discharged to the outside world. In contrast, the amount of circulating water that can be drawn back to the culture tank will also be greatly reduced, so it is actually cultured. The water body that must be replenished by the trough is far more than 10%. Moreover, the discharge water has environmental regulations to comply with, and it also causes great trouble to the aquaculture industry, but it will still consume a lot of recycled water.

In addition, there is a more serious problem that is brought up by the bubble separator. These water-soluble aquaculture wastewaters are saturated with ammonia nitrogen and phosphorus, which is a great source of pollution for aquaculture waters, but it is a large amount of elements needed for plant cultivation. If any soluble wastewater containing nutrient sources is directly discharged, it is not only a resource. The waste is also easy to cause the impact of the ecological environment.

Therefore, the method for aquaculture and plant cultivation combined with circulating water provided by the invention is that the aquaculture wastewater brought out by the protein separator is subjected to two membrane filtration treatments, and the recovered water can be supplemented as a culture tank. The water source is used to reduce the amount of replenishment required by the culture system for circulating water, and the high protein concentrate which has been cut by membrane filtration can be taken to the plant factory, and further becomes a nutrient solution for the cultivation of the plant bed, thereby achieving waste reduction. Purpose of use.

Therefore, the method for aquaculture and plant cultivation combined with circulating water according to the present invention comprises the following steps: Step (A): preparing a culture tank, the culture tank is provided with culture water; and step (B): The aquaculture water in the culture tank is aerated to provide sufficient dissolved oxygen content of the culture water; step (C): extracting the upper overflow water and the bottom sewage of the culture tank to a circular flat ultrafiltration membrane unit and a protein separation Using the circular flat membrane ultrafiltration membrane unit to membrane filter the upper overflow water to obtain circulating water that can be directly pumped back to the culture tank, and the protein separator has an ultrafine bubble generating unit; step (D) : The injecting gas is sucked from the ultra-fine bubble generating unit, so that the injecting gas is quickly mixed with the water body to form a large amount of fine bubbles, thereby accumulating proteins, residual baits, excretions and large molecular glue in the water body on the surface of the bubble. And push up to form a bubble liquid, and the water body after the bubble reaches the separation interface flows downward to form another circulating water that flows back to the culture tank; step (E) The bubble liquid mixture and the concentrated waste liquid generated by the round plate ultrafiltration membrane unit are transported to a collection tank for static fermentation to become aquaculture wastewater; and step (F): the culture wastewater is passed through another circle Flat ultrafiltration membrane The first membrane filtration treatment is carried out in the unit, and the ultrafiltration membrane is used to intercept the mucus and suspended matter in the water body to separate the primary filtrate and the turbid high protein concentrate; step (G): discharging the turbid protein concentrate to a collection a barrel for use as a fertilizer nutrient or a biological bait culture solution for planting a planting plant; step (H): pumping the primary filtrate after dialysis through the ultrafiltration membrane into a nanofiltration membrane unit for carrying out The second membrane filtration treatment uses a nanofiltration membrane to further remove ammonia nitrogen in the primary filtrate to become recovered water rich in amino acid, and the trapped water becomes a clarified high protein concentrate to be used as a hydroponic plant or Seaweed, fern culture solution; Step (I): The recovered water produced by the nanofiltration membrane is returned to the culture tank for reuse.

According to the above method for aquaculture and plant cultivation in combination with circulating water, in the step (D), the injecting gas sucked by the ultrafine bubble generating unit contains a certain concentration of ozone to improve the removal of ammonia nitrogen by the protein separator. s efficiency.

According to the above method for aquaculture and plant cultivation in combination with circulating water, in step (G), fresh water is added to the turbid high protein concentrate to be diluted.

According to the above method for aquaculture and plant cultivation combined with circulating water, wherein after the diluted turbid high protein concentrate is absorbed and utilized by the plant cultivation plant bed, the exudate can be discharged from the plant bed, and the exudate can pass through After the filtration process, it is returned to the collection tank for reuse.

According to the above method for aquaculture and plant cultivation in combination with circulating water, in the step (H), the clarified high protein concentrate which is trapped is further diluted with fresh water.

The invention relates to a system for combining aquaculture and plant cultivation with circulating water, which is connected between a culture tank and a plant factory, and comprises a culture tank, a blower, a first pump, and a protein separation. , a set of foam tanks, at least one round flat membrane ultrafiltration membrane The unit, a collection tank, a nanofiltration membrane unit, a recovery tank and a second pump. The culture tank is provided with a water having an adjusted pH value, a solid concentration, and a mixture of edible oysters and various chemically pure mites. The blower is disposed on one side of the culture tank, and can inject air into the culture tank to maintain sufficient dissolved oxygen amount of the culture water. The first pumping pump has an overflow pipe adjacent to the culture tank and located at the surface of the aquaculture water, and a sewage pipe extending to the bottom of the culture tank and communicating with the overflow pipe; a protein separator, and the a first pump connection having a trough communicating with the drain pipe, a fine bubble generating unit disposed in the trough, an outlet pipe extending from the bottom of the trough to the culture tank, and an installation The foam at the top of the trough flows out of the tube, and the ultra-fine bubble generating unit sucks the injecting gas, so that the injecting gas is quickly mixed with the water in the trough to form a large amount of fine bubbles, thereby further protein and residual baits in the water body. The excrement and the larger molecular glue accumulate on the surface of the bubble, and push up to form a bubble mixed liquid, and then discharged from the foam outflow pipe, and the water body after the bubble reaches the separation interface flows downward and then flows back through the outlet pipe. Go to the breeding tank. The foam collecting tank is connected with the foam outflow pipe for receiving the bubble liquid discharged from the foam outflow pipe, and after standing, becomes aquaculture wastewater. The circular flat-plate ultrafiltration membrane unit is connected to one side of the collecting tank and can be pumped into the aquaculture wastewater, and the circular flat-plate ultrafiltration membrane unit has ultrafiltration membranes arranged at equal intervals vertically to Under the action of water pressure, the ultrafiltration membrane is used to intercept the mucus and suspended matter in the water body to separate the primary filtrate and the turbid high protein concentrate; a collection tank is used to undertake the turbid high protein concentrate to be used as a plant factory. A nutrient for cultivating a plant bed or a culture solution for biological bait. The nanofiltration membrane unit is connected to one side of the circular flat membrane ultrafiltration membrane unit, and can be pumped into the primary filtrate to be used therein, and the nanofiltration membrane is used to further remove ammonia nitrogen in the primary filtrate to become an amine rich. The water of the base acid is recovered, and the water body that is trapped becomes a clarified high-protein concentrate, which is used as a plant organic fertilizer or a seaweed or fern culture solution. The recovery tank is disposed on one side of the nanofiltration membrane unit for receiving the recovered water produced by the nanofiltration membrane unit; and a second pump is disposed between the culture tank and the recovery tank In order to return the recovered water to the breeding tank for reuse.

According to the above system for aquaculture and plant cultivation combined with circulating water, wherein the circular flat ultrafiltration membrane unit has two, wherein a circular flat ultrafiltration membrane unit is connected to the culture tank and the second pump Meanwhile, another round flat ultrafiltration membrane unit is connected between the collection tank and the nanofiltration membrane unit to directly filter the culture water in the culture tank and use it as circulating water.

10‧‧‧ breeding tank

11‧‧‧Overflow

12‧‧‧ farming water

13‧‧‧First pump

14‧‧‧Overflow tube

15‧‧‧Sewage pipe

16‧‧‧Second pump

20‧‧‧Blowers

30‧‧‧ Protein Separator

31‧‧‧Cylinder

32‧‧‧Superfine bubble generating unit

33‧‧‧Outlet

34‧‧‧Foam outflow tube

35‧‧‧Injection gas

36‧‧‧Ozone

40‧‧‧ Round flat ultrafiltration membrane unit

50‧‧‧

60‧‧‧ Round flat ultrafiltration membrane unit

70‧‧‧ collection bucket

80‧‧‧ plant factory

81‧‧‧ fresh water

82‧‧‧ Biological bait culture

83‧‧‧Exudate

90‧‧‧ nanofiltration membrane unit

100‧‧‧Recycling sink

110‧‧‧ collection bucket

111‧‧‧Clarification of high protein concentrate

120‧‧‧Seaweed fern culture

Fig. 1 is a system diagram of the apparatus for carrying out aquaculture and plant cultivation in combination with circulating water according to the present invention.

Figure 2 is a flow chart showing the steps of the method of combining recirculating aquaculture and plant cultivation.

Figure 3 is a schematic view of the culture tank, the weir and the first pump.

Referring to Figures 1 and 2, an embodiment of the method of the present invention for combining aquaculture and plant cultivation with circulating water comprises the steps of:

Step (A): preparing a culture tank 10, the culture tank 10 is provided with an overflow weir 11 (as shown in Fig. 3), and a culture water 12 having a predetermined water level is accommodated therein, and the aforementioned culture water 12 is first adjusted. The PH value, the solid concentration and the addition of edible mash and a variety of chemically pure sputum to meet the requirements of aquaculture water quality.

Step (B): aerating the culture water 12 in the culture tank 10 to provide The amount of dissolved oxygen in the culture water 12 is sufficient. In this step, the air blower is continuously blown into the tank body by a blower 20 installed on the side of the culture tank 10, in addition to maintaining sufficient dissolved oxygen in the culture water 12 In addition, the feed and secretion, the residual feed and the excrement in the culture tank 10 can be floated and pushed up, and then overflowed from the overflow weir 11 to flow out of the culture tank 10.

Step (C): extracting the upper overflow water and the bottom sewage of the culture tank 10 to a protein separator 30 and a circular flat ultrafiltration membrane unit 40, and performing the upper overflow water through the circular flat membrane ultrafiltration membrane unit 40. The membrane is filtered to obtain circulating water that can be directly pumped back to the culture tank 10. Referring to Figure 3, in the present embodiment, a first pump 11 is taken to the protein separator 30, the first pump 13 having a reservoir 10 adjacent to the aquaculture tank 10 and located at its overflow weir 11 An overflow pipe 14 and a sewage pipe 15 extending to the bottom of the culture tank 10 and communicating with the overflow pipe 14 to pump the overflow water and sewage of the culture tank 10 into the first pumping pump 13 Protein separator 30.

Further, the protein separator 30 has a cylindrical tank 31 communicating with the sewage pipe 15, an ultrafine bubble generating unit 32 disposed in the cylindrical tank 31, and an outlet extending from the bottom of the cylindrical tank 31 to the culture tank 10. A water pipe 33, and a foam outflow pipe 34 installed at the top of the cylindrical groove 31. The related structure of the circular flat-plate ultrafiltration membrane unit 40 can be seen in the invention patents such as Taiwan Publication No. I312767, I318233, and I348389, and the detailed description thereof will not be repeated, whereby the water body filtered by the membrane becomes a circulation. The water can be directly pumped back to the culture tank 10 by a second pump 16 for circulation, and the trapped concentrated waste liquid is discharged into a collection tank 50 for the next stage of treatment. Incidentally, in this step, the membrane filtration treatment of the culture water 12 in the culture tank 10 is directly provided, and only the water purification effect of the suspended matter in the filtered water is provided to achieve the circulating water filtration treatment without removing ammonia nitrogen and water solubility in the water. The role of sex organisms.

Step (D): injecting the injecting gas 35 from the ultrafine bubble generating unit 32, and rapidly mixing the injecting gas 35 with the water body to form a large amount of fine bubbles, thereby further separating the protein, the residual bait, and the excrement in the water body. Larger molecular colloids (such as shrimp shells and scales) accumulate on the surface of the bubble and push up to form a bubble liquid, and are discharged from the foam outflow pipe 34 to the outside of the groove 31, and after the bubble reaches the separation interface The water body flows downward, thereby forming another circulating water that is returned to the culture tank 10 by the water outlet pipe 33. Due to the detailed structure of the main components of the protein separator 30, the inventor of the present invention applies to the 102113702 The invention patent application is the same, so I will not repeat it. Moreover, in the present embodiment, the injecting gas 35 is further mixed with a certain concentration of ozone 36, and the high concentration of ozone will play a more comprehensive and effective sterilization and disinfection effect on the aquaculture water 12. At this time, the protein separator 30 has the function of the ozone reaction chamber, and appropriately adjusts the intake air amount of the ozone, and the excess ozone directly oxidizes the ammonia nitrogen and the nitrite nitrogen in the water into nitrate nitrogen or nitrogen gas to precipitate from the water, thereby greatly improving The efficiency of the protein separator to remove ammonia nitrogen.

Step (E): conveying the bubble liquid mixture produced by the protein separator 30 and the concentrated waste liquid generated by the round plate ultrafiltration membrane unit 40 to the collection tank 50 for static fermentation. To become aquaculture wastewater containing high ammonia nitrogen and suspended solids concentration. Further, the bubble liquid of the protein separator 30 is sent to the collecting tank 50 via the foam outflow pipe 34.

Step (F): pumping the aquaculture wastewater in the collecting tank 50 to another circular flat ultrafiltration membrane unit 60 for the first membrane filtration treatment, and using the ultrafiltration membrane to intercept the solid suspended matter in the water body and larger A molecular substance to separate the primary filtrate and the turbid high protein concentrate.

Step (G): discharging the turbid protein concentrate to a collection tank 70. Since the turbid high protein concentrate contains protein, amino acid, fat and carbohydrate, it is a concentrated liquid or high water content paste under normal conditions. It exists in the form of a form, so it can be mixed into the culture soil The composting treatment is carried out to provide an organic fertilizer nutrient for planting the plant bed as the plant factory 80, or directly diluted with fresh water 81 and used as a biological bait culture liquid 82 for the aquarist.

Step (H): pumping the primary filtrate after dialysis through the ultrafiltration membrane into a nanofiltration membrane unit 90 for the second membrane filtration treatment, and further removing the ammonia nitrogen and water solubility in the primary filtrate by using the nanofiltration membrane. The organic matter and the nitrite are used as the recovered water rich in the amino acid to be stored in a recovery water tank 100, and the water body trapped by the nanofiltration membrane becomes the clarified high protein concentrate 111, the clarified high protein concentrate The 111 is installed in a collection tank 110, and the clarified high protein concentrate 110 can be used as a plant organic fertilizer of the plant factory 80 or a culture liquid 120 of sea vegetables and ferns.

Step (I): The recovered water stored in the recovery water tank 100 is recirculated to the culture tank 10 for reuse.

It is worth mentioning that in order to provide the plant factory 80 with suitable nutrient solution concentration for plant cultivation, the turbid, clarified high concentration protein concentrate produced in the steps (G) and (H) can be adjusted in concentration. Fresh water 81 is added to the respective collection tanks 70, 110 for dilution to achieve the desired concentration in accordance with plant plant 80.

Further, the exudate 83 discharged from the plant bed after being cultivated by the plant factory 80 can be refluxed into the collection tank 70 and mixed with the turbid high protein concentrate, so that the plant can be reduced on the one hand. The water demand of 80 in cultivation can also reduce the cost of plant cultivation and increase the planting efficiency.

Therefore, the present invention is a water-soluble bubble liquid produced by the protein separator 30, a concentrated waste liquid which is trapped during circulating filtration of the culture water in the culture tank 10, and a discharge of the ultrafiltration membrane. The spray water is collected and left to be aquaculture wastewater, and the aquaculture wastewater is further separated into a turbid high protein concentrate by solid-liquid separation treatment of the ultrafiltration membrane (UF membrane). The primary filtrate and the primary filtrate are filtered by a special nanofiltration membrane to produce recycled water that meets the aquaculture water quality standard and is used as a supplementary water source for the culture tank, thereby improving the recycling efficiency of the circulating water. Thus, the original filtrate can only be directly The aquaculture wastewater and spray water discharged to the outside world can be effectively recycled and reused, so that the water resources are not wasted, the pollution of the wastewater is reduced, and the cost of aquaculture can be saved, thereby improving the breeding efficiency.

Further, the turbid, clarified high-protein concentrate produced by the membrane filtration treatment can be taken to the plant factory 80, and further becomes a nutrient solution for carrying out the cultivation bed, thereby achieving the purpose of reducing waste and recycling.

The above is only one embodiment of the present invention, and should not be construed as limiting the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention should be It is still within the scope of the invention patent.

10‧‧‧ breeding tank

12‧‧‧ farming water

13‧‧‧First pump

15‧‧‧Sewage pipe

16‧‧‧Second pump

20‧‧‧Blowers

30‧‧‧ Protein Separator

31‧‧‧Cylinder

32‧‧‧Superfine bubble generating unit

33‧‧‧Outlet

34‧‧‧Foam outflow tube

35‧‧‧Injection gas

36‧‧‧Ozone

40‧‧‧ Round flat ultrafiltration membrane unit

50‧‧‧

60‧‧‧ Round flat ultrafiltration membrane unit

70‧‧‧ collection bucket

80‧‧‧ plant factory

81‧‧‧ fresh water

82‧‧‧ Biological bait culture

83‧‧‧Exudate

90‧‧‧ nanofiltration membrane unit

100‧‧‧Recycling sink

110‧‧‧ collection bucket

111‧‧‧Clarification of high protein concentrate

120‧‧‧Seaweed fern culture

Claims (7)

A method for aquaculture and plant cultivation combined with circulating water comprises the following steps: step (A): preparing a culture tank containing the culture water; and step (B): performing the culture water in the culture tank Aeration to provide sufficient dissolved oxygen content of the culture water; step (C): extracting the upper overflow water and the bottom sewage of the culture tank to a circular flat ultrafiltration membrane unit and a protein separator, respectively, using the circular flat plate The ultrafiltration membrane unit membrane filters the upper overflow water to obtain circulating water that can be directly pumped back to the culture tank, and the protein separator has an ultrafine bubble generating unit; and the step (D): generating from the ultrafine bubbles The unit sucks the injecting gas, so that the injecting gas is quickly mixed with the water body to form a large amount of fine bubbles, thereby accumulating the protein, the residual bait, the excrement and the large molecular glue in the water body on the surface of the bubble, and pushing up to form The bubble is mixed, and the water body after the bubble reaches the separation interface flows downward to form another circulating water that is refluxed to the culture tank; Step (E): the aforementioned bubble mixture and the The concentrated waste liquid generated by the round plate ultrafiltration membrane unit is transported to a set of foam tanks for static fermentation to become aquaculture wastewater; step (F): the culture wastewater is passed through another circular flat membrane ultrafiltration membrane unit The first membrane filtration treatment uses an ultrafiltration membrane to trap the mucus and suspended matter in the water to separate the primary filtrate and the turbid high protein concentrate; step (G): discharging the turbid protein concentrate to a collection tank, It is used as a fertilizer nutrient or a biological bait culture solution for planting a planting plant; step (H): pumping the primary filtrate after dialysis through the ultrafiltration membrane into a nanofiltration membrane unit for the second time Membrane filtration treatment, using a nanofiltration membrane to further remove ammonia nitrogen in the primary filtrate to become recovered water rich in amino acid, and the trapped water body becomes a clarified high protein concentrate as a hydroponic plant or seaweed, fern The cultivating solution; the step (I): returning the recovered water produced by the nanofiltration membrane to the culture tank for reuse. The method for aquaculture and plant cultivation in combination with circulating water according to claim 1, wherein in the step (D), the injecting gas sucked by the ultrafine bubble generating unit contains a certain concentration of ozone. To improve the efficiency of the protein separator to remove ammonia nitrogen. A method for aquaculture and plant cultivation in combination with circulating water according to the first aspect of the invention, wherein in the step (G), fresh water is added to the turbid high protein concentrate to be diluted. A method for aquaculture and plant cultivation combined with circulating water as described in claim 3, wherein the diluted turbid high protein concentrate can be ooze out from the plant bed after being absorbed and utilized by the supply value cultivation plant bed The liquid and the exudate may be returned to the collection tank for reuse after passing through a filtration process. The method for aquaculture and plant cultivation combined with circulating water according to claim 1, wherein in the step (H), the clarified high protein concentrate which is trapped is further diluted with fresh water. A system for combining aquaculture and plant cultivation with circulating water is connected between a culture tank and a plant factory, and comprises: a culture tank having a adjusted pH value, a solid concentration and an edible meal Aquaculture water with a variety of chemically pure scorpions; a blower is placed on one side of the culture tank, and air can be blown into the culture tank to maintain sufficient dissolved oxygen in the culture water; a first pump, An overflow pipe adjacent to the culture tank and located at a level of the aquaculture water, and a sewage pipe extending to the bottom of the culture tank and communicating with the overflow pipe; a protein separator connected to the first pump Having a trough communicating with the drain pipe, a fine bubble generating unit disposed in the trough, an outlet pipe extending from the bottom of the trough to the culture tank, and a foam outlet installed at the top of the trough a tube, the ultrafine bubble generating unit sucks the injecting gas, so that the injecting gas rapidly mixes with the water in the tank to form a large amount of fine bubbles, thereby further removing protein, residual bait and excrement in the water body. Larger molecular glue The volume accumulates on the surface of the bubble, and is pushed up to form a bubble liquid, which is then discharged from the bubble outflow pipe, and the water body which reaches the separation interface with the bubble flows downwardly and returns to the culture tank through the outlet pipe; a foam collecting tank is connected with the foam outflow pipe for receiving the bubble liquid discharged from the foam outflow pipe, and after standing, becomes a breeding wastewater; at least one round flat ultrafiltration membrane unit is connected to the set The floating trough ultrafiltration membrane unit has an ultrafiltration membrane arranged at equal intervals vertically to remove the water to be passed through the ultrafiltration membrane under water pressure. The mucus and suspended matter are separated to separate the primary filtrate and the turbid high protein concentrate; a collection tank is used to receive the turbid high protein concentrate to serve as a nutrient for the planting plant or a culture solution for the biological bait. A nanofiltration membrane unit is connected to one side of the circular flat membrane ultrafiltration membrane unit, and can be pumped into the primary filtrate to be used therein, and the nanofiltration membrane is used to further remove ammonia nitrogen in the primary filtrate to become rich Amino acid The water is recovered, and the trapped water becomes a clarified high-protein concentrate, which is used as a plant organic fertilizer or a seaweed or fern culture solution; a recovery tank is disposed on one side of the nanofiltration membrane unit for holding The recovered water produced by the nanofiltration membrane unit; and a second pump is disposed between the culture tank and the recovery tank to return the recovered water to the culture tank for reuse. The system for aquaculture and plant cultivation combined with circulating water according to claim 6 of the patent application, wherein the circular flat ultrafiltration membrane unit has two, wherein a circular flat ultrafiltration membrane unit is connected to the culture tank. Between the second pump and the second pump, another round flat ultrafiltration membrane unit is connected between the mist collecting tank and the nanofiltration membrane unit to directly filter the culture water in the culture tank to become circulating water. use.