CN115490321A - Fish culture wastewater biological treatment and recycling system - Google Patents
Fish culture wastewater biological treatment and recycling system Download PDFInfo
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- CN115490321A CN115490321A CN202211437093.5A CN202211437093A CN115490321A CN 115490321 A CN115490321 A CN 115490321A CN 202211437093 A CN202211437093 A CN 202211437093A CN 115490321 A CN115490321 A CN 115490321A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C02F3/105—Characterized by the chemical composition
- C02F3/107—Inorganic materials, e.g. sand, silicates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
- C02F1/325—Irradiation devices or lamp constructions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C02F3/105—Characterized by the chemical composition
- C02F3/108—Immobilising gels, polymers or the like
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/109—Characterized by the shape
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
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- Biological Treatment Of Waste Water (AREA)
Abstract
The invention provides a biological treatment and recycling system for fish-farming wastewater, relates to the technical field of breeding industry, and solves the technical problem that the ammonia nitrogen removal efficiency of the fish-farming wastewater treatment and recycling technology in the prior art is insufficient. The device comprises a plurality of biological treatment units and biological balls, wherein all the biological balls are placed in the biological treatment units, and the biological treatment units are communicated with a fish culture pond; the biological ball comprises an external shell and a functional filler, wherein the functional filler is filled in the external shell, the external shell is of a grid structure, and the functional filler comprises a modified zeolite filler, a nanometer modified polyurethane filler and a manganese zinc ferrite filler.
Description
Technical Field
The invention relates to the technical field of breeding industry, in particular to a biological treatment and recycling system for fish culture wastewater.
Background
With the rapid development of fish farming industry in China, the problems of water resource waste and water pollution caused by the traditional artesian water farming method are more serious. In order to ensure good water quality required by the fish culture process, a large amount of fresh water resources are extracted to maintain the water level of the pond, and meanwhile, tail water of fish culture is discharged into the surrounding water area without being treated, so that the waste of the fresh water resources is caused, and the water quality of the surrounding water area is deteriorated due to the discharge of substances such as nitrogen, phosphorus, COD (chemical oxygen demand), antibiotics and the like in waste water, so that a series of ecological environment problems are caused.
At present, the domestic commonly used fish-farming wastewater treatment and reuse technology mainly focuses on biological methods and physical and chemical methods (such as adsorption, ion exchange and the like), has good effects on biochemical oxygen demand (BOD 5) and suspended matters (SS), but has insufficient removal efficiency on ammonia nitrogen, and causes obvious harm to fish.
The applicant has found that the prior art has at least the following technical problems:
in the prior art, the removal efficiency of pollutants, particularly ammonia nitrogen, in fish culture wastewater is insufficient; especially, under the low-temperature condition in winter, the ammonia nitrogen removal effect of the biological method is sharply reduced, and the physicochemical method has the operations of backwashing, regeneration, cleaning and the like, so that the treatment process is longer, the process is more complex, the operation and maintenance are complex, and the cost is higher; the application scene in the prior art is single in whole and low in flexibility.
Disclosure of Invention
The invention aims to provide a biological treatment and recycling system for fish-farming wastewater, which aims to solve the technical problem that the ammonia nitrogen removal efficiency of the fish-farming wastewater treatment and recycling technology in the prior art is insufficient. The technical effects that can be produced by the preferred technical scheme of the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a biological treatment and recycling system for fish culture wastewater, which comprises a plurality of biological treatment units and biological balls, wherein all the biological balls are placed in the biological treatment units, and the biological treatment units are communicated with a fish culture pond;
the biological ball comprises an external shell and a functional filler, wherein the functional filler is filled in the external shell, the external shell is of a grid structure, and the functional filler comprises a modified zeolite filler, a nanometer modified polyurethane filler and a manganese zinc ferrite filler.
Optionally, the filling rate of the functional filler in the outer shell is 50-85%, the filling rate of the biological ball in the biological treatment unit is 50-80%, and the diameter of the biological ball is 80-150 mm.
Optionally, the material adopted by the outer shell is polyethylene or polypropylene.
Optionally, the biological treatment unit includes barrel, mud bucket, play water collector pipe, water inlet distribution pipe, support grid plate and support frame, the bottom of barrel with the mud bucket is linked together, the support frame supports the barrel, it is located to go out the water collector pipe the top region of barrel, water inlet distribution pipe with support grid plate all is located the bottom region of barrel, support grid plate is located the top of water inlet distribution pipe, all biological ball places support grid plate with go out between the water collector pipe, water inlet distribution pipe's one end is passed the lateral wall of barrel and with the delivery port of fish pond is linked together, the one end of play water collector pipe is passed the lateral wall of barrel and with the water inlet of fish pond is linked together.
Optionally, the fish culture device further comprises an ultraviolet sterilization unit, a water inlet of the ultraviolet sterilization unit is communicated with the water outlet collecting pipe, and a water outlet of the ultraviolet sterilization unit is communicated with a water inlet of the fish culture pond.
Optionally, the ultraviolet sterilization unit comprises a box body and a plurality of ultraviolet emitters, the ultraviolet emitters are installed in the box body, all the ultraviolet emitters are distributed in the box body in a staggered mode, a water inlet of the box body is communicated with the water outlet water collecting pipe, and a water outlet of the box body is communicated with a water inlet of the fish pond.
Optionally, the water inlet distribution pipe is arranged in the barrel, the support grid plate is arranged on the side wall of the barrel, and one end of the aeration pipe penetrates through the side wall of the barrel and is communicated with the air blower.
Optionally, the biological treatment unit further comprises a water pump.
Optionally, the functional filler further comprises an iron carbon filler.
The invention provides a biological treatment and recycling system for fish-farming wastewater, which mainly utilizes the combination of modified zeolite and microorganisms to realize the in-situ adsorption and analysis of ammonia nitrogen, thereby realizing the organic combination of physical and biological ammonia nitrogen removal.
Waste water in the fish pond can enter into biological treatment unit to can get rid of the pollutant in the waste water through a plurality of biological balls, because outside casing is the grid structure, waste water can enter into outside casing through the hole on the outside casing inside, and contact with the functional filler, thereby the corresponding pollutant in the waste water can be got rid of to the functional filler, and the functional filler includes modified zeolite filler, nanometer modified polyurethane filler and manganese zinc ferrite filler. The modified zeolite is used as a core filler, so that on one hand, the biological affinity of the modified zeolite can be utilized to improve the film forming efficiency and increase the effective biomass of a system; on the other hand, the modified zeolite has higher ammonia nitrogen adsorption capacity, and is more favorable for the ammonia nitrogen adsorption process under the low-temperature condition, and the desorption process is favorable when the temperature is increased. The characteristic is matched with the biodegradation effect, and feasibility is provided for the in-situ efficient removal of ammonia nitrogen in winter.
In detail, during non-winter periods, when the system is used for purifying the fish culture wastewater, the whole water temperature of the fish culture wastewater is high (> 12 ℃), and the biological balls can synchronously exert the physical adsorption function and the microbial degradation function of the modified zeolite. In the initial stage, the physical adsorption effect of the modified zeolite on ammonia nitrogen is taken as the main characteristic, and after the adsorption saturation, the modified zeolite surface biomembrane carries out biotransformation on the ammonia nitrogen on the adsorption sites in the modified zeolite through nitrification so as to resolve the adsorption sites of the modified zeolite, and the adsorption vacancies are released again to continuously complete the physical adsorption effect. Along with the operation of the system, the two functions can reach a dynamic balance, and the ammonia nitrogen in the wastewater can be efficiently and stably removed. During winter, the whole water temperature of the fish culture wastewater is low (5-12 ℃), the activity of a biological membrane in a system is reduced at the moment, and the treatment efficiency is limited, so the physical adsorption of the modified zeolite is mainly used at the stage until the winter low-temperature period (usually about 3 months) is passed. And then, along with the return rise of the water temperature, the activity of the microorganisms is gradually recovered, ammonia nitrogen adsorbed by the modified zeolite begins to be gradually analyzed along with the rise of the temperature, and is further degraded by the microorganisms, so that the concentration of the ammonia nitrogen in the effluent can be effectively controlled, and the technical problem of insufficient ammonia nitrogen removal efficiency of the fish-farming wastewater treatment and recycling technology in the prior art is solved.
For the system, besides the modified zeolite as a core filler, nano modified polyurethane and manganese zinc ferrite filler are also filled for strengthening the biological treatment capacity of the system. Respectively, the nano modified polyurethane filler has large specific surface area, high porosity and strong biological adhesion, is easy to quickly form a biological film, and ensures that a biological treatment unit has enough biomass to complete a biological purification process; the manganese-zinc ferrite filler is rich in manganese-zinc ferrite, has stronger magnetism, can form a magnetization effect, generates adsorption force on one hand, increases the adsorption capacity of biological balls, shortens the membrane hanging period and enhances the adsorption strength of biological membranes; on the other hand, the conversion speed and efficiency of pollutants in the wastewater can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a biological treatment and recycling system for fish-farming wastewater according to an embodiment of the present invention;
FIG. 1, biological treatment unit; 11. a cylinder body; 12. a mud bucket; 13. a water outlet and collecting pipe; 14. a water inlet and distribution pipe; 15. supporting the grid plate; 16. a support frame; 17. an aeration pipe; 2. biological balls; 3. an ultraviolet sterilization unit; 31. a box body; 32. an ultraviolet emitter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Moreover, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
The invention provides a biological treatment and recycling system for fish culture wastewater, which comprises a biological treatment unit 1 and biological balls 2, wherein the number of the biological balls 2 is multiple, all the biological balls 2 are placed in the biological treatment unit 1, and the biological treatment unit 1 is communicated with a fish culture pond;
the biological ball 2 comprises an external shell and a functional filler, the functional filler is filled in the external shell, the external shell is of a grid structure, the size of holes in the external shell is smaller than that of the functional filler, the functional filler is prevented from flowing out of the holes in the external shell, and the functional filler comprises a modified zeolite filler, a nanometer modified polyurethane filler and a manganese zinc ferrite filler. The invention provides a biological treatment and recycling system for fish-farming wastewater, which mainly utilizes the combination of modified zeolite and microorganisms to realize the in-situ adsorption and analysis of ammonia nitrogen, thereby realizing the organic combination of physical and biological ammonia nitrogen removal. Waste water in the fish pond can enter the biological treatment unit 1 and can be removed through the biological balls 2, pollutants in the waste water can be removed due to the fact that the outer shell is of a grid structure, the waste water can enter the outer shell through holes in the outer shell and is in contact with the functional filler, and therefore the corresponding pollutants in the waste water can be removed through the functional filler, the functional filler comprises a modified zeolite filler, a nanometer modified polyurethane filler and a manganese zinc ferrite filler, and the modified zeolite is used as a core filler, so that on one hand, the biological affinity of the modified zeolite can be utilized, the film hanging efficiency is improved, and the effective biomass of a system is increased; on the other hand, the modified zeolite has higher ammonia nitrogen adsorption capacity, is more beneficial to the ammonia nitrogen adsorption process under the low-temperature condition, and is beneficial to the analysis process when the temperature is increased. The characteristic is matched with the biodegradation effect, and feasibility is provided for the in-situ efficient removal of ammonia nitrogen in winter. During non-winter periods, when the system is used for purifying the fish culture wastewater, the integral water temperature of the fish culture wastewater is higher (more than 12 ℃), and the biological balls 2 can synchronously exert the physical adsorption function and the microbial degradation function of the modified zeolite. In the initial stage, the physical adsorption effect of the modified zeolite on ammonia nitrogen is taken as the main characteristic, and after the adsorption saturation, the modified zeolite surface biomembrane carries out biotransformation on the ammonia nitrogen on the adsorption sites in the modified zeolite through nitrification so as to resolve the adsorption sites of the modified zeolite, and the adsorption vacancies are released again to continuously complete the physical adsorption effect. Along with the operation of the system, the two functions can reach a dynamic balance, and the ammonia nitrogen in the wastewater can be efficiently and stably removed. During winter, the whole water temperature of the fish culture wastewater is low (5-12 ℃), the activity of a biological membrane in a system is reduced at the moment, and the treatment efficiency is limited, and at the stage, the physical adsorption effect of the modified zeolite is mainly achieved until the winter low-temperature period (usually about 3 months) is passed. And then, along with the rising of the water temperature, the microbial activity is gradually recovered, and the ammonia nitrogen adsorbed by the modified zeolite is gradually analyzed along with the rising of the temperature and is further degraded by microorganisms, so that the concentration of the ammonia nitrogen in the effluent can be effectively controlled, and the technical problem of insufficient removal efficiency of the ammonia nitrogen in the fish-farming wastewater treatment and recycling technology in the prior art can be solved. In addition, the nano modified polyurethane filler in the biological ball 2 has large specific surface area, high porosity and strong biological adhesion, is easy to quickly form a biological film, and ensures that a biological treatment unit has enough biomass to complete a biological purification process; the manganese-zinc ferrite filler is rich in manganese-zinc ferrite, has stronger magnetism, can form a magnetization effect, generates adsorption force on one hand, increases the adsorption capacity of the biological ball 2, shortens the membrane hanging period, and enhances the adsorption strength of a biological membrane; on the other hand, the conversion speed and efficiency of pollutants in the wastewater can be improved.
As an alternative embodiment, the filling rate of the functional filler in the outer shell may be 50% to 85%, the filling rate of the bio-ball 2 in the biological treatment unit 1 may be 50% to 80%, the diameter of the bio-ball 2 may be 80 mm to 150mm, and the material used for the outer shell may be polyethylene or polypropylene.
As an alternative embodiment, the biological treatment unit 1 includes a cylinder 11, a mud bucket 12, a water outlet collecting pipe 13, a water inlet distributing pipe 14, a supporting grid plate 15 and a supporting frame 16, the bottom of the cylinder 11 is communicated with the mud bucket 12, the supporting frame 16 supports the cylinder 11, the water outlet collecting pipe 13 is located in the top region of the cylinder 11, the water inlet distributing pipe 14 and the supporting grid plate 15 are both located in the bottom region of the cylinder 11, the supporting grid plate 15 is located above the water inlet distributing pipe 14, a plurality of through holes are arranged on the supporting grid plate 15, all biological balls 2 are placed between the supporting grid plate 15 and the water outlet collecting pipe 13, one end of the water inlet distributing pipe 14 passes through the side wall of the cylinder 11 and is communicated with the water outlet of the fish culture pond, a plurality of water outlet holes are arranged on the side wall of the water inlet distributing pipe 14, one end of the water outlet collecting pipe 13 passes through the side wall of the cylinder 11 and is communicated with the water inlet of the fish culture pond, and a plurality of water inlet holes are arranged on the side wall of the water outlet collecting pipe 13. The supporting grid plate 15 can provide a supporting function, and can also be used for passing aged biological films and suspended matters in wastewater and the like which are dropped from the biological balls 2 and are collected in the mud bucket 12.
As an optional implementation mode, the fish culture device further comprises an ultraviolet sterilization unit 3, a water inlet of the ultraviolet sterilization unit 3 is communicated with the water outlet collecting pipe 13, and a water outlet of the ultraviolet sterilization unit 3 is communicated with a water inlet of the fish culture pond. Waste water in the fish pond enters into barrel 11 through water distribution pipe 14, thereby because the increase of waste water, waste water can enter into the area that biological ball 2 is located through supporting grid plate 15, purifies the back through biological ball 2, and the purified water of barrel 11 top can enter into ultraviolet sterilization unit 3 through a water collector 13 that goes out, carries out germicidal treatment, at last flows back to in the fish pond, and simultaneously, the remaining pollutant can concentrate in mud bucket 12 after biological ball 2 purifies. Pollutants can be conveniently removed after being concentrated on the mud bucket 12.
As an alternative embodiment, the ultraviolet sterilization unit 3 includes a box 31 and a plurality of ultraviolet emitters 32, the ultraviolet emitters 32 are installed in the box 31, all the ultraviolet emitters 32 are distributed in the box 31 in a staggered manner, which can increase the path of the purified water and prolong the time of the purified water in the box 31, thereby increasing the sterilization time, the water inlet of the box 31 is communicated with the water outlet collecting pipe 13, and the water outlet of the box 31 is communicated with the water inlet of the fish pond. The ultraviolet emitter 32 can emit ultraviolet rays which can destroy the biological structure of microorganisms, can rapidly cut off pathogens in a short time, kill harmful bacteria in purified water and ensure the quality of recycled water.
As an optional embodiment, the device further comprises an aeration pipe 17 and a blower, wherein the aeration pipe 17 is installed in the barrel 11, the aeration pipe 17 is located between the water inlet distribution pipe 14 and the support grid plate 15, a plurality of air vents are arranged on the side wall of the aeration pipe 17, and one end of the aeration pipe 17 penetrates through the side wall of the barrel 11 and is communicated with the blower. Aeration pipe 17 and air-blower are when system's oxygenation aeration accomplishes biochemical reaction, and the distribution of the inside flow field of intensive system can realize the synchronous of multiple pollutant of waste water in step on the whole and get rid of, including ammonia nitrogen, biochemical oxygen demand, suspended solid, floater (for fish culture fodder or fish excrement and urine usually) etc.. The effluent after oxygenation and aeration is rich in high-concentration dissolved oxygen (more than 5 mg/L), and the requirement of fish culture is met.
As an alternative embodiment, the biological treatment unit 1 further comprises a water pump, and the water pump is used for providing power for the fish culture water, so that the water in the fish culture pond passes through the biological treatment unit 1 and the ultraviolet sterilization unit 3 in sequence and then returns to the fish culture pond.
As an alternative embodiment, the functional filler further comprises an iron carbon filler. The iron-carbon filler can be used for carrying out dephosphorization treatment on the wastewater, effectively replaces the investment of a dephosphorization chemical agent, and reduces the problem of environmental pollution in the dephosphorization process of the wastewater. The functional filler can be configured according to the difference of the pollutant conditions in the wastewater, and other fillers can be added to the functional filler. The functional filler is prepared by high-temperature sintering treatment, solid particles are mutually bonded, crystal grains grow up, gaps (air holes) and crystal boundaries gradually decrease, the total volume is shrunk through the transfer of substances, the density is increased, finally, the functional filler becomes a compact polycrystalline sintered body, and the functional filler inside the outer shell does not need to be bonded, so that soluble salts and heavy metals can be prevented from entering a water body, and the risk of secondary pollution is avoided.
Inside barrel 11, biological ball 2 crisscross row arranges, also the multilayer is arranged in barrel 11 simultaneously, waste water gets into behind the barrel 11, at first because the effect of blockking of biological ball 2 and inside function filler, can have the flow field of different velocity of flow, the great suspended solid of some granule, because of local velocity of flow reduces, will subside in bottom mud bucket 12, and the slow biological ball 2 of flow field or inside function filler surface are easily attached to some middle-size and small-size suspended solids, the floater in the waste water has not only been effectively got rid of, the suspended solid (fish fodder, excrement and urine etc.), the formation of function filler surface biomembrane has also been promoted.
The biological treatment and recycling system for fish culture wastewater mainly aims at treating and recycling wastewater of large-scale fishponds and fish farms, and aims at small-scale household landscape fish culture, and the rapid functional filler can be laid in bulk in a small-scale treatment system, so that the biological treatment and recycling system can play a role.
The invention takes the biological ball 2 as a core to form a set of biological treatment system, combines the ultraviolet sterilization technology to realize the removal of various pollutants in the fish culture wastewater, including ammonia nitrogen, biochemical oxygen demand, suspended matters, floating matters (generally fish culture feed or fish feces), germs and the like, and can improve the dissolved oxygen level in water, so that the treated effluent can meet the fish culture requirement and can be reused in a fish culture pond, thereby avoiding the water environment pollution and effectively reducing the consumption of fresh water resources.
Compared with the prior art, the invention can solve the problems of unstable treatment efficiency of low-concentration ammonia nitrogen in fish culture wastewater and low treatment efficiency in winter particularly by using the conventional biological method and ecological method through the design of the biological ball 2, and also avoids the problems of complex process operation and maintenance and higher cost caused by independently adopting a physicochemical method. The zeolite-biological regeneration technology is utilized to ensure the stable removal of ammonia nitrogen under the low water temperature condition (5-12 ℃), and the toxic action on fishes is avoided.
The invention does not need long flow, complicated pretreatment processes such as multi-stage filtration, adsorption and the like, has simple flow, is economic and efficient, can realize the functions of filtration, biological purification and reoxygenation through the design of the integrated biological treatment unit, and further ensures the recycled water quality by matching with the ultraviolet disinfection at the tail end.
The invention can flexibly adjust the configuration of the functional filler in the biological ball 2 aiming at the difference of pollutants in the fish culture wastewater so as to meet different treatment requirements; meanwhile, aiming at treatment systems with different scales, the filling form of the functional filler can be flexibly changed, the functional filler can be filled in biological balls for layered staggered filling, and can also be filled in a bulk functional filler form, so that the treatment effect can be exerted.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A system for biologically treating and recycling fish-farming wastewater is characterized by comprising a biological treatment unit (1) and biological balls (2),
the number of the biological balls (2) is multiple, all the biological balls (2) are placed in the biological treatment unit (1), and the biological treatment unit (1) is communicated with a fish pond;
the biological ball (2) comprises an external shell and a functional filler, wherein the functional filler is filled in the external shell, the external shell is of a grid structure, and the functional filler comprises a modified zeolite filler, a nanometer modified polyurethane filler and a manganese zinc ferrite filler.
2. The biological treatment and recycling system for fish-farming wastewater according to claim 1, wherein the filling rate of the functional filler in the outer casing is 50-85%, the filling rate of the biological balls (2) in the biological treatment unit (1) is 50-80%, and the diameter of the biological balls (2) is 80-150 mm.
3. The biological treatment and reuse system for fish culture wastewater according to claim 1, wherein the outer shell is made of polyethylene or polypropylene.
4. The biological treatment and recycling system for fish farming wastewater according to claim 1, wherein the biological treatment unit (1) comprises a barrel (11), a mud bucket (12), a water outlet collecting pipe (13), a water inlet distributing pipe (14), a support grid plate (15) and a support frame (16), the bottom of the barrel (11) is communicated with the mud bucket (12), the support frame (16) supports the barrel (11), the water outlet collecting pipe (13) is located at the top region of the barrel (11), the water inlet distributing pipe (14) and the support grid plate (15) are both located at the bottom region of the barrel (11), the support grid plate (15) is located above the water inlet distributing pipe (14), all the biological balls (2) are located between the support grid plate (15) and the water outlet collecting pipe (13), one end of the water inlet distributing pipe (14) passes through the side wall of the barrel (11) and is communicated with the water outlet of the water pool of the fish farming wastewater, and one end of the water outlet collecting pipe (13) passes through the side wall of the barrel (11) and is communicated with the water inlet of the fish farming barrel.
5. The biological treatment and recycling system for fish culture wastewater according to claim 4, further comprising an ultraviolet sterilization unit (3), wherein a water inlet of the ultraviolet sterilization unit (3) is communicated with the water outlet collecting pipe (13), and a water outlet of the ultraviolet sterilization unit (3) is communicated with a water inlet of the fish culture pond.
6. The biological treatment and recycling system for fish culture wastewater according to claim 5, wherein the ultraviolet sterilization unit (3) comprises a box body (31) and a plurality of ultraviolet emitters (32), the ultraviolet emitters (32) are installed in the box body (31), all the ultraviolet emitters (32) are distributed in the box body (31) in a staggered manner, the water inlet of the box body (31) is communicated with the water outlet collecting pipe (13), and the water outlet of the box body (31) is communicated with the water inlet of the fish culture pond.
7. The biological treatment and recycling system for fish culture wastewater according to claim 4, further comprising an aeration pipe (17) and a blower, wherein the aeration pipe (17) is installed in the barrel (11), the aeration pipe (17) is located between the water inlet distribution pipe (14) and the support grid plate (15), and one end of the aeration pipe (17) passes through the side wall of the barrel (11) and is communicated with the blower.
8. The biological treatment and reuse system for fish culture wastewater according to claim 4, wherein said biological treatment unit (1) further comprises a water pump.
9. The biological treatment and reuse system for fish culture wastewater according to claim 1, wherein said functional filler further comprises iron carbon filler.
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Application publication date: 20221220 |