CN112616766A - Improved circulating water aquaculture system and tail water treatment method thereof - Google Patents
Improved circulating water aquaculture system and tail water treatment method thereof Download PDFInfo
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- CN112616766A CN112616766A CN202011591269.3A CN202011591269A CN112616766A CN 112616766 A CN112616766 A CN 112616766A CN 202011591269 A CN202011591269 A CN 202011591269A CN 112616766 A CN112616766 A CN 112616766A
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- 238000009360 aquaculture Methods 0.000 title claims abstract description 38
- 244000144974 aquaculture Species 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 20
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 82
- 238000000746 purification Methods 0.000 claims abstract description 34
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- 230000001488 breeding effect Effects 0.000 claims abstract description 28
- 238000006396 nitration reaction Methods 0.000 claims abstract description 20
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 16
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 11
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims abstract description 9
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- 229910002651 NO3 Inorganic materials 0.000 abstract 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 1
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- 241001125889 Micropterus salmoides Species 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
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- 241001453382 Nitrosomonadales Species 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
- A01K63/042—Introducing gases into the water, e.g. aerators, air pumps
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Marine Sciences & Fisheries (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The invention provides an improved circulating water aquaculture ecological system, which comprises an ecological culture purification area, a first disinfection area, a intensive culture pond area and a second disinfection area, wherein the ecological culture purification area, the first disinfection area, the intensive culture pond area and the second disinfection area are sequentially arranged along the water circulation direction; the ecological breeding purification area comprises a facility high-density breeding area and a biological nitrification area used for purifying the tail water containing high-concentration ammonia nitrogen generated in the facility high-density breeding area. In the ecological breeding purification area, breeding tail water generated in the facility high-density breeding area is subjected to nitration reaction through a biological nitration area, and ammonium nitrogen and nitrite nitrogen which have high toxicity to breeding objects are converted into almost nontoxic nitrate nitrogen; and then, tail water with high nitrate nitrogen content in the biological nitrification area is disinfected and released to the bottom of the intensive culture pond area, and organic matters in the intensive culture pond area are oxidized by using nitrate, so that the pH value and the oxidation-reduction potential of sediments in the intensive culture pond are improved, the water quality of the intensive culture pond area is improved, and the water environment health of the intensive culture pond area is promoted.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of aquaculture, in particular to an improved circulating water aquaculture system and a tail water treatment method thereof.
[ background of the invention ]
When the intensive culture is quitted in the lake and reservoir, the pressure for improving and upgrading the culture mode is further increased. At present, various breeding modes generally adopt high-density stocking and mass feeding intensive culture modes, but the utilization rate of the fed feed is low, usually, breeding objects can only absorb and utilize 20-25% of feed protein, and the residual nitrogen compounds in the feed enter a breeding environment in the forms of residual feed, excrement, decomposition products of the excrement, metabolites of the breeding objects and the like. In a general culture pond, due to the fact that a culture area is large, timely decontamination cannot be achieved, substances can be deposited in a culture environment and become the most important source of water pollution, nitrogen and phosphorus nutritive salts and soluble organic pollutants can be continuously released into the culture environment, water quality is damaged, oxygen consumption is increased, and direct harm is finally generated to culture objects. When the polluted water body of the aquaculture pond is exchanged with the natural water body, the influence on the natural water body is very large.
In order to solve the problem of severe aquaculture water environment, a mode of connecting an aquaculture area with a biological purification area is adopted in the prior art, for example, in the prior art, CN110590061A adopts operations of biological treatment, physical filtration and the like to convert toxic nitrogen such as ammonium nitrogen, nitrite nitrogen and the like in the water body of the aquaculture area into nitrogen to overflow the environment. The method relieves the problem of water pollution of the intensive culture pond to a certain extent, but organic matters in the bottom mud of the pond cannot be consumed, so that the bottom mud of the pond continuously releases toxic and harmful substances such as ammonium nitrogen, nitrite nitrogen, reduced sulfides and the like, the culture water environment improvement effect is not ideal, the defects of large floor area and high energy consumption exist, and most of farmers are reluctant to apply the technical mode and the like.
[ summary of the invention ]
The invention aims to provide an improved circulating water aquaculture system and a tail water treatment method thereof, and aims to solve the technical problem that the water quality of a intensive culture pond area is poor in the prior art.
The technical scheme of the invention is as follows: the improved circulating water aquaculture system comprises an ecological culture purification area, a first disinfection area, a intensive culture pond area and a second disinfection area which are sequentially arranged along the water circulation direction;
the ecological breeding purification area comprises a facility high-density breeding area and a biological nitrification area for purifying the tail water of the facility high-density breeding area;
the first disinfection area is used for disinfecting tail water flowing into the biological nitrification area;
the second disinfection area is used for disinfecting tail water flowing into the intensive culture pond area.
Preferably, the first disinfection area is arranged adjacent to the biological nitrification area, the second disinfection area is arranged adjacent to the facility-based high-density culture area, and the intensive culture pond area is enclosed outside an integral area formed by the ecological culture purification area, the first disinfection area and the second disinfection area;
tail water in the biological nitrification area enters the intensive culture pond area after being sterilized by the first sterilization area, and tail water in the intensive culture pond area enters the facility high-density culture area after being sterilized by the second sterilization area; the water flow direction of the improved circulating water aquaculture system sequentially passes through the facility high-density aquaculture area, the biological nitrification area, the first disinfection area, the intensive culture pond area and the second disinfection area to form circulation.
Preferably, the area of the ecological culture purification area is 5-10% of the total area of the improved circulating water aquaculture system, and the area of the facility high-density culture area is 30-50% of the total area of the ecological culture purification area.
Preferably, the biological nitrification region is enriched with nitrifying bacteria, and comprises one or more of an artificial wetland, a biological filter and a suspended biological brush.
Preferably, the facility high-density culture area comprises one of a flow channel culture device, a container culture device and a captive culture device.
The other technical scheme of the invention is as follows: the method for treating tail water of the aquaculture system is provided, wherein the aquaculture system is the improved circulating water aquaculture system, and comprises the following steps:
introducing tail water in the facility high-density farm to the biological nitrification zone;
carrying out nitration reaction on the inflowing tail water in the biological nitration zone, and converting ammonium nitrogen and nitrite nitrogen in the tail water into nitrate nitrogen by utilizing nitrifying bacteria enriched in the biological nitration zone;
introducing tail water in a first volume of the biological nitrification area into the first disinfection area for disinfection treatment every other first period, and introducing the disinfected tail water into the bottom of the intensive culture pond area from the first disinfection area; and simultaneously, introducing tail water in the intensive culture pond area with a second volume into the second disinfection area for disinfection treatment, and introducing the disinfected tail water into the facility high-density culture area from the second disinfection area.
Preferably, during the nitration reaction, aerating the biological nitration zone, and controlling the dissolved oxygen of the biological nitration zone to be more than or equal to 2 mg/L. Preferably, the first period is 10-20 days, and the first volume is 20% -40% of the total water volume of the ecological breeding and purifying area.
Preferably, the first disinfection area and the second disinfection area are disinfected by ozone respectively, and the ozone concentration of the first disinfection area and the second disinfection area is 0.33-0.4 mg/L.
The invention has the beneficial effects that: the improved circulating water aquaculture ecological system comprises an ecological culture purification area, a first disinfection area, a intensive culture pond area and a second disinfection area which are sequentially arranged along the water circulation direction; the ecological breeding purification area comprises a facility high-density breeding area and a biological nitrification area which is used for purifying the tail water of the facility high-density breeding area, wherein the facility high-density breeding area and the biological nitrification area are sequentially arranged; by the mode, the ecological breeding purification area is combined with the intensive culture pond area; in the ecological culture purification area, tail water of the facility high-density culture area is subjected to nitration reaction in a biological nitration area to form tail water with high nitrate nitrogen content; the tail water with high nitrate nitrogen content in the biological nitrification area is released to the intensive culture pond area after being disinfected, so that organic matters in the intensive culture pond area can be oxidized, the pH value and the oxidation-reduction potential of the intensive culture pond area can be adjusted, the water quality of the intensive culture pond area is improved, and the water environment health of the intensive culture pond area is promoted. The culture system of the invention enables the facility high-density culture area and the intensive culture pond area to be mutually purified by connecting the facility high-density culture area, the biological nitrification area and the intensive culture pond area, thereby saving land resources, meeting the environmental protection requirement of zero pollution discharge and creating higher economic benefit.
[ description of the drawings ]
FIG. 1 is a schematic structural diagram of an improved circulating water aquaculture system according to an embodiment of the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first", "second" and "third" in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. All directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
An embodiment of the present invention provides an improved circulating water aquaculture system, which comprises an ecological aquaculture purification area 10, a first disinfection area 20, a intensive culture pond area 30 and a second disinfection area 40, which are sequentially arranged along the water circulation direction, as shown in fig. 1.
The ecological breeding purification area 10 comprises a facility high-density breeding area 11 and a biological nitrification area 12 which are sequentially arranged, and the biological nitrification area 12 is used for purifying tail water in the facility high-density breeding area 11.
It should be noted that, in this specification, the water in the facility high-density culture area 11 is also referred to as tail water, and the water in the intensive culture pond area 30 is also referred to as culture water. DO is dissolved oxygen (dissolved oxygen), which is molecular oxygen in air dissolved in water.
The facility high-density culture area 11 includes one or more of a flow channel culture device, a container culture device and a captive culture device.
Wherein, the biological nitrification region 12 is enriched with nitrifying bacteria, and the biological nitrification region 12 comprises one or more of an artificial wetland, a biological filter and a suspended biological brush. Nitrifying bacteria (Nitrifying bacteria) are a class of aerobic bacteria including ammonia oxidizing bacteria and nitrite oxidizing bacteria. In the first alternative embodiment, the activated sludge includes a large amount of microorganisms, the biofilm rich in nitrobacteria can be obtained by inoculating the activated sludge into a substrate for acclimatization culture, the activated sludge for inoculation is not particularly limited, and the activated sludge of a general tail water treatment plant in the prior art can be used, or special activated sludge improved by screening can be used.
The intensive pond area 30 has conventional fish farming facilities, and the farming method is a general conventional farming method.
Under high-density culture, the cultured fishes have more excrement and residual baits, and the ammonium nitrogen of the water body has higher concentration and contains nitrite nitrogen with certain concentration; the facility high-density culture area 11 is connected with the biological nitrification area 12, tail water of the facility high-density culture area 11 enters the biological nitrification area 12, nitrification reaction occurs under the action of nitrifying bacteria enriched in the biological nitrification area 12, and ammonium nitrogen and nitrite nitrogen in the tail water are converted into nitrate Nitrogen (NO)3 -N of the state).
In the intensive culture pond area 30, because the culture area is large and the culture objects cannot be cleaned in time, organic matters such as nitrogen compounds, residual baits, feces, decomposition products of the three and culture object metabolites and the like in the feed can be deposited in the bottom mud (sediments) of the intensive culture pond area 30 to become an endogenous source of water body pollution of the intensive culture pond area 30, and the bottom mud continuously releases toxic and harmful substances such as ammonium nitrogen, nitrite nitrogen, reduction-state sulfides and the like into the water body, so that the water body quality of the intensive culture pond area 30 is deteriorated, the oxygen consumption is increased, and the growth of the culture objects is not facilitated.
In this embodiment, the tail water with high nitrate nitrogen content in the biological nitrification area 12 is introduced into the bottom sediment of the intensive culture pond area 30, and the tail water with high nitrate nitrogen content can oxidize organic matters in the bottom sediment of the intensive culture pond area 30, improve the condition that the bottom sediment of the intensive culture pond area 30 releases pollutants to water, adjust the pH value and the oxidation-reduction potential of the intensive culture pond area 30, and promote the water health of the intensive culture pond area 30.
In this embodiment, while the tail water with high nitrate nitrogen content in the biological nitrification region 12 flows into the intensive culture pond region 30, the ecological culture purification region 10 needs to be supplemented with a water source, and the water (tail water) in the intensive culture pond region 30 is supplemented as a water source into the facility high-density culture region 11 of the ecological culture purification region 10.
Wherein, in order to avoid cross-contamination, the first disinfection zone 20 is used for disinfecting the tail water to be flowed into the biological nitrification zone 12 of the intensive pond zone 30; the second disinfection zone 40 is used for disinfecting the tail water to be flowed into the intensive culture pond zone 30 of the facility-based high-density culture zone 11. The first and second disinfection zones 20, 40 are independent of each other with no water exchange between them.
In the present embodiment, a clean and efficient cultivation system is formed by combining the intensive culture pond area 30, the ecological cultivation and purification area 10, and the first and second sterilization areas 20 and 40. The denitrification purpose of the ecological culture purification area 10 is different from the complete denitrification concept of the traditional tail water treatment facility, and high nitrate nitrogen tail water is generated through nitration reaction and is introduced into the bottom of the intensive culture pond area 30. The method not only can dilute the pollutants in the facility high-density culture area 10, but also can consume the pollutants in the intensive culture pond area 30 by the high nitrate nitrogen tail water, and the ecological purification process can generate economic benefit by the operation of facility culture equipment, thereby relieving the problems of reduction of the economic benefit generated by the occupied area of a tail water treatment area and the like. Therefore, the aquaculture system of the embodiment adopts an improved circulating water aquaculture mode, can realize high-yield, green and efficient circulating water aquaculture at the same time, and achieves the aims of tail water recycling and zero emission.
In an alternative embodiment, the first disinfection area 20 is disposed adjacent to the biological nitrification area 12, the second disinfection area 20 is disposed adjacent to the high-density culture area 11, and the intensive pond area 30 is enclosed outside an integral area formed by the ecological culture and purification area 10, the first disinfection area 20 and the second disinfection area 40.
The tail water in the biological nitrification area 12 enters the intensive culture pond area 30 after being sterilized by the first sterilization area 20, and the tail water in the intensive culture pond area 30 enters the facility high-density culture area 11 after being sterilized by the second sterilization area 40; the water flow direction of the improved circulating water aquaculture system sequentially passes through the facility high-density culture area 11, the biological nitrification area 12, the first disinfection area 20, the intensive culture pond area 30 and the second disinfection area 40 to form a circulation.
Further, the area of the ecological culture purification area 10 is 5% -10% of the total area of the improved circulating water aquaculture system, and the area of the facility high-density culture area 11 is 30% -50% of the total area of the ecological culture purification area 10.
Further, an aeration pipe is laid at the bottom of the biological nitrification area 12, the aeration pipe is connected with a blower for oxygenation, and the DO value of the biological nitrification area 12 is controlled to be greater than or equal to 2 mg/L.
Further, the first sterilization zone 20 and the second sterilization zone 40 can be sterilized by means of ultraviolet radiation, and the wavelength of the ultraviolet radiation is 230-255 nm, preferably 255 nm.
Further, the first sterilization zone 20 and the second sterilization zone 40 can be sterilized by ozone, and the concentration of ozone in the first sterilization zone 20 and the second sterilization zone 40 is controlled to be greater than or equal to a first concentration, wherein the first concentration is 0.1-0.15 mg/L, and preferably the first concentration is 0.33-0.4 mg/L.
Correspondingly, the invention also provides a tail water treatment method of the aquaculture system, which is applied to the improved circulating water aquaculture system and comprises the following steps:
s101, introducing tail water in the facility high-density culture area into the biological nitrification area.
Wherein, the facility high-density culture area 11 is connected with the biological nitrification area 12 through a pipeline, and tail water in the facility high-density culture area 11 continuously flows into the biological nitrification area 12 in the operation process.
Further, during the operation of the facility high-density culture area 11, bottom sewage discharge may be performed every second period, for example, the second period is 1 day, the facility high-density culture area 11 is subjected to bottom sewage discharge operation every day, and the tail water of the third volume in the facility high-density culture area 11 is led out to the outside of the system and is replenished with a clean water source of the third volume.
S102, carrying out nitration reaction on the inflowing tail water in the biological nitration area, and converting ammonium nitrogen and nitrite nitrogen in the tail water into nitrate nitrogen by using the nitrifying bacteria enriched in the biological nitration area.
Wherein, in the nitration reaction process, aeration is carried out on the biological nitration zone 12, and the dissolved oxygen of the biological nitration zone 12 is controlled to be more than or equal to 2 mg/L. Preferably, the dissolved oxygen of the biological nitrification zone 12 is controlled to be greater than or equal to 8 mg/L. Tail water with high nitrate nitrogen content is generated through the action of nitrifying bacteria in the biological nitrification region 12.
S103, introducing tail water in the biological nitrification area with a second volume into the first disinfection area for disinfection treatment every other second period, and introducing the disinfected tail water into the bottom of the intensive culture pond area from the first disinfection area; and simultaneously, introducing tail water in the intensive culture pond area with a second volume into the second disinfection area for disinfection treatment, and introducing the disinfected tail water into the facility high-density culture area from the second disinfection area.
Wherein the first period is 10-20 days, and the first volume is 20-40% of the total water amount of the ecological culture purification area 10. That is, the tail water with high nitrate nitrogen content in the biological nitrification area 12 is disinfected every 10-20 days and then slowly introduced into the bottom sludge of the intensive culture pond area 30 to oxidize organic matters in the bottom sludge. Meanwhile, because a large amount of tail water in the biological nitrification area 12 flows out, the tail water in the facility-based high-density culture area 11 can flow into the biological nitrification area, and a water source needs to be supplemented to the facility-based high-density culture area 11, so in this step, the tail water in the intensive culture pond area 30 is disinfected and then supplemented to the facility-based high-density culture area 11, and the internal water circulation of the system is realized while the pollutant concentration in the facility-based high-density culture area 11 is diluted. Further, the second volume is less than or equal to the first volume.
The first disinfection area 20 and the second disinfection area 40 can be disinfected by means of ultraviolet radiation, and the wavelength of the ultraviolet radiation is 230-255 nm, preferably 255 nm.
Or, the first sterilization zone 20 and the second sterilization zone 40 can be sterilized by ozone, and the concentration of ozone in the first sterilization zone 20 and the second sterilization zone 40 is controlled to be greater than or equal to a first concentration, wherein the first concentration is 0.1-0.15 mg/L, and preferably the first concentration is 0.33-0.4 mg/L.
Example 1
With the culture area of 26680m2For example, the average culture water depth is 2.5m, and the specific implementation mode is as follows:
wherein 1334m2(5 percent of the culture area) is used as an ecological culture purification area, and 8 rings of culture facilities (occupying 667 m) are erected at the front end2) The cultured fish is micropterus salmoides, 40t of water is pumped in a bottom sewage discharge mode every day for precipitation and collection, and then the supernatant flows through a subsequent biological brush area (biological nitrification area) for nitrification. Every 15 days, 533t of water (about 20 percent of the ecological culture purification area) in the ecological culture purification area flows through the first disinfection area to be disinfected for 30min and then is slowly dispersed and discharged to the bottom of the intensive culture pond area. And water is supplemented from the intensive culture pond area, and the water source is required to be disinfected for 30min by the second disinfection area when entering the facility high-density culture area.
Wherein the aeration mode of the biological nitrification area adopts bottom aeration, and the aeration pipe needs to be connected with a blower by 6-8 mg/L. The disinfection area adopts ultraviolet rays for disinfection. The ultraviolet radiation wavelength is 255 nm.
Comparative example 1
Comparative example 1 includes a first intensive culture pond area having the same area as that of example 1, except that in comparative example 1, sterilized tail water is introduced from an external second intensive culture pond area into bottom mud of the first intensive culture pond area every 15 days, and then tail water is pumped from the first intensive culture pond area to the outside.
Table 1 shows the content of ammonium nitrogen in the water environment of the housing system zone (facility high-density culture zone), the intensive culture pond zone and the first intensive culture pond zone in comparative example 1, which were operated in example 1 month after the start of culture:
table 1 water quality monitoring results of example 1 and comparative example 1
It can be seen from table 1 that the water quality in the intensive culture pond area of working example 1 was better than that in the first intensive culture pond area of comparative example 1.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An improved circulating water aquaculture ecological breeding system is characterized by comprising an ecological breeding purification area, a first disinfection area, a intensive culture pond area and a second disinfection area which are sequentially arranged along the water circulation direction;
the ecological breeding purification area comprises a facility high-density breeding area and a biological nitrification area for purifying the tail water of the facility high-density breeding area;
the first disinfection area is used for disinfecting tail water flowing into the biological nitrification area;
the second disinfection area is used for disinfecting tail water flowing into the intensive culture pond area.
2. The improved circulating water aquaculture system of claim 1 wherein said first sterile area is disposed adjacent to said nitrification area, said second sterile area is disposed adjacent to said high-density culture area, and said intensive pond area is enclosed outside an integral area formed by said ecological culture purification area, said first sterile area and said second sterile area;
tail water in the biological nitrification area enters the intensive culture pond area after being sterilized by the first sterilization area, and tail water in the intensive culture pond area enters the facility high-density culture area after being sterilized by the second sterilization area; the water flow direction of the improved circulating water aquaculture system sequentially passes through the facility high-density aquaculture area, the biological nitrification area, the first disinfection area, the intensive culture pond area and the second disinfection area to form circulation.
3. The improved circulating water aquaculture system of claim 2 wherein said ecological culture purification area has an area of 5% to 10% of the total area of said improved circulating water aquaculture system and said facility high density culture area has an area of 30% to 50% of the total area of said ecological culture purification area.
4. The improved circulating water aquaculture system of claim 1 wherein said nitrification region is enriched with nitrifying bacteria and said nitrification region comprises one or more of an artificial wetland, a biofilter, and a suspended biological brush.
5. The improved circulating water aquaculture system of claim 1 wherein said high density farming areas comprise one or more of a flow-channel farming installation, a container farming installation, and a captive farming installation.
6. A method of tail water treatment for aquaculture systems according to any of claims 1 to 5, comprising:
introducing tail water in the facility high-density farm to the biological nitrification zone;
carrying out nitration reaction on the inflowing tail water in the biological nitration zone, and converting ammonium nitrogen and nitrite nitrogen in the tail water into nitrate nitrogen by utilizing nitrifying bacteria enriched in the biological nitration zone;
introducing tail water in a first volume of the biological nitrification area into the first disinfection area for disinfection treatment every other first period, and introducing the disinfected tail water into the bottom of the intensive culture pond area from the first disinfection area; and simultaneously, introducing tail water in the intensive culture pond area with a second volume into the second disinfection area for disinfection treatment, and introducing the disinfected tail water into the facility high-density culture area from the second disinfection area.
7. The method for treating tail water of a culture system according to claim 6, wherein during the nitrification reaction, aeration is performed on the biological nitrification region, and the dissolved oxygen in the biological nitrification region is controlled to be greater than or equal to 2 mg/L.
8. The tail water treatment method for the culture system according to claim 6, wherein the first period is 10-20 days, and the first volume is 10-40% of the total water amount of the ecological culture purification area.
9. The method for treating the tail water of the aquaculture system of claim 6, wherein the first disinfection zone and the second disinfection zone are respectively disinfected by ozone, and the concentration of the ozone in the first disinfection zone and the concentration of the ozone in the second disinfection zone are 0.33-0.4 mg/L.
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Application publication date: 20210409 Assignee: Hainan Shuilin Fishery Co.,Ltd. Assignor: HUAZHONG AGRICULTURAL University Contract record no.: X2024980013083 Denomination of invention: Improved Circular Water Aquaculture System and Its Tailwater Treatment Method Granted publication date: 20211228 License type: Exclusive License Record date: 20240830 |