Nitrification and denitrification device of factory aquaculture circulating water system

Abstract

The utility model belongs to the technical field of aquaculture, and discloses a nitrification and denitrification device of an industrial aquaculture circulating water system, which comprises a raw sewage tank, a first reaction tank, a middle water tank, a second reaction tank and a water outlet tank, a water outlet of the first reaction tank is communicated with a middle water tank through a pipeline, the middle water tank is communicated with a water inlet of the second reaction tank through a pipeline, a water outlet of the second reaction tank is communicated with a water outlet tank through a pipeline, and a backflow pipeline is further arranged between the water outlet tank and the first reaction tank. The first reaction tank and the second reaction tank form a two-stage scale batch reactor, so that the sewage treatment effect in the recirculating aquaculture system can be improved under the condition of lower energy consumption, and better economic benefits and environmental protection benefits are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of aquaculture, and more specifically, to a nitrification and denitrification device for a circulating water system of industrial aquaculture. Background Art

[0002] In the recirculating aquaculture system, the metabolic products of the cultured objects, food residues and other proteins cannot be decomposed in time, causing ammonia nitrogen and nitrite to accumulate rapidly in the water. At the same time, due to the high breeding density and limited water volume in the recirculating aquaculture system, these factors will cause the aquaculture water to deteriorate rapidly, and even cause a large number of deaths of cultured objects, causing huge economic losses. Ammonia nitrogen and nitrite are currently important water pollutants in the aquaculture process because they are highly toxic to cultured objects. Studies have shown that 1kg of fish can produce 1.5g of ammonia nitrogen per day. Data show that the maximum tolerance limit of fish to molecular ammonia in the long term is 0.025mg / L. Therefore, it is of great significance to adopt new water treatment technologies to avoid the accumulation of these harmful substances and achieve rapid and efficient removal effects.

[0003] Although conventional biological nitrification-denitrification denitrification technology is a more effective treatment method compared to physical and chemical methods, the electricity consumption accounts for more than 1 / 3 of its operating costs (including depreciation costs, etc.), and aeration (mainly required for nitrification) consumes more electricity. Denitrification is the core step of conventional biological denitrification. Since the carbon source in the circulating aquaculture wastewater is often insufficient, in order to ensure sufficient denitrification, a large amount of organic carbon source needs to be added. Organic matter is also an energy substance that can be produced through fermentation. Therefore, the addition of organic carbon source not only increases the operating investment cost, but also reduces the fermentation energy yield. In addition, the addition of organic matter will also produce by-product greenhouse gases such as CO2, CH4, and N2O; it is known that N2O is an intermediate product or end product that is difficult to avoid in the process of nitrification and denitrification. N2O is the third most powerful greenhouse gas after CO2 and CH4. It stays in the atmosphere for up to 114 years and has a warming potential of about 300 times that of CO2. Studies have shown that more than 2 / 3 of N2O is produced by microbial metabolism, and biological denitrification of sewage is an important way of N2O production that cannot be ignored. Therefore, the development of economical, efficient, new, pollution-free and sustainable biological denitrification technology can not only alleviate the increasingly tense energy shortage problem in my country, but also meet the urgent needs of the country's sustainable development. Utility Model Content

[0004] In order to solve the above problems, the present application provides a nitrification and denitrification device for a factory-scale aquaculture circulating water system.

[0005] The present application provides a nitrification and denitrification device for a factory-scale aquaculture circulating water system, which adopts the following technical solution:

[0006] A nitrification and denitrification device for a factory aquaculture circulating water system comprises a raw sewage tank, a first reaction tank, an intermediate water tank, a second reaction tank and an outlet water tank, wherein the raw sewage tank is connected to a water inlet of the first reaction tank through a pipeline, the water outlet of the first reaction tank is connected to the intermediate water tank through a pipeline, the intermediate water tank is connected to a water inlet of a second reaction tank through a pipeline, the water outlet of the second reaction tank is connected to the outlet water tank through a pipeline, a reflux pipeline is further arranged between the outlet water tank and the first reaction tank, the first reaction tank and the second reaction tank are both transparent organic glass tank bodies, agitators are installed on the tops of the tank bodies facing the insides of the tanks, an aeration device is connected to the bottom of the first reaction tank, and a detection module and a temperature control module are arranged inside the first reaction tank and the second reaction tank.

[0007] Furthermore, peristaltic pumps and one-way valves are provided on the pipelines between the raw sewage tank, the first reaction tank, the intermediate water tank, the second reaction tank and the outlet water tank.

[0008] Through the above technical scheme, the water to be treated in the circulating water system first enters the raw sewage tank, and then is pumped into the first reaction tank through a peristaltic pump. The first reaction tank can be used as a short-range nitrification reactor and operates in an anaerobic / aerobic mode. Its effluent first enters the intermediate water tank for standing, and then enters the second reaction tank through a peristaltic pump. The second reaction tank can be used as an anaerobic ammonia oxidation granular sludge reactor. After anaerobic stirring, sedimentation and drainage, its effluent flows into the effluent tank. Part of the water in the effluent tank flows back to the first tank body, i.e., the short-range nitrification reactor, through a reflux pipe, and the rest is the system effluent stored in the effluent tank and finally enters the aquaculture circulating water system. The reflux ratio of the water in the effluent tank can be adjusted according to the effluent quality of the second tank body, i.e., the anaerobic ammonia oxidation granular sludge reactor.

[0009] Furthermore, the outer walls of the first reaction tank and the second reaction tank are each provided with five sampling ports at equal intervals vertically.

[0010] The above technical solution makes it easy to collect samples and adjust the drainage ratio.

[0011] Furthermore, the bottoms of the first reaction tank and the second reaction tank are both provided with three-phase mud discharge ports.

[0012] The above technical solution makes it easy to remove the sludge in the tank.

[0013] Furthermore, the detection module includes a pH monitor and a DO monitor.

[0014] Through the above technical solution, the pH monitor and DO monitor are used to monitor and record the changes of pH value and DO in real time during the operation of the reactor.

[0015] Furthermore, the aeration device includes a blower, a rotor flowmeter and a sand-sticking block microporous aerator.

[0016] Through the above technical solution, the air flow is provided by the blower, the gas flow is controlled by the rotor flowmeter, and the gas uniformity is adjusted by the sand block microporous aerator.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] The present application forms a two-stage intermittent reactor by means of a first reaction tank and a second reaction tank, which can improve the sewage treatment effect in a circulating aquaculture system with lower energy consumption, and has better economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structural composition of this application.

[0020] Description of the numbers in the figure:

[0021] 1. Raw sewage tank; 2. First reaction tank; 3. Intermediate water tank; 4. Second reaction tank; 5. Outlet water tank; 6. Return pipe; 7. Agitator; 8. Aeration device; 9. Detection module; 10. Temperature control module; 11. Peristaltic pump; 12. One-way valve; 13. Sampling port; 14. Three-phase sludge discharge port. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0023] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Embodiment 1:

[0026] The present application is further described in detail below in conjunction with the accompanying drawings.

[0027] The embodiment of the present application discloses a nitrification and denitrification device for a factory-scale aquaculture circulating water system, comprising a raw sewage tank 1, a first reaction tank 2, an intermediate water tank 3, a second reaction tank 4 and an outlet water tank 5. The raw sewage tank 1 is connected to a water inlet of the first reaction tank 2 through a pipeline, the outlet of the first reaction tank 2 is connected to the intermediate water tank 3 through a pipeline, the intermediate water tank 3 is connected to a water inlet of the second reaction tank 4 through a pipeline, the outlet of the second reaction tank 4 is connected to the outlet water tank 5 through a pipeline, a reflux pipeline 6 is further arranged between the outlet water tank 5 and the first reaction tank 2, the first reaction tank 2 and the second reaction tank 4 are both transparent organic glass tank bodies, a stirrer 7 is installed on the top of the tank body facing the inside of the tank, an aeration device 8 is connected to the bottom of the first reaction tank 2, and a detection module 9 and a temperature control module 10 are both arranged inside the first reaction tank 2 and the second reaction tank 4.

[0028] See also Figure 1 A peristaltic pump 11 and a one-way valve 12 are provided on the pipelines between the raw sewage tank 1, the first reaction tank 2, the intermediate water tank 3, the second reaction tank 4 and the outlet water tank 5.

[0029] The untreated water in the circulating water system first enters the raw sewage tank 1, and then is pumped into the first reaction tank 2 through the peristaltic pump 11. The first reaction tank 2 can be used as a short-range nitrification reactor and operates in an anaerobic / aerobic manner. Its effluent first enters the intermediate water tank 3 for standing, and then enters the second reaction tank 4 through the peristaltic pump 11. The second reaction tank 4 can be used as an anaerobic ammonia oxidation granular sludge reactor. After anaerobic stirring, sedimentation and drainage, its effluent flows into the effluent tank 5. Part of the water in the effluent tank 5 flows back to the first tank body, i.e., the short-range nitrification reactor, through the reflux pipe 6, and the rest is the system effluent stored in the effluent tank, and finally enters the aquaculture circulating water system. The reflux ratio of the water in the effluent tank 5 can be adjusted according to the effluent quality of the second tank body, i.e., the anaerobic ammonia oxidation granular sludge reactor.

[0030] The outer walls of the first reaction tank 2 and the second reaction tank 4 are both vertically and evenly spaced with five sampling ports 13, which are convenient for collecting samples and adjusting the drainage ratio. The bottoms of the first reaction tank 2 and the second reaction tank 4 are both provided with three-phase mud discharge ports 14, which are convenient for discharging sludge in the tanks. The detection module 9 includes a pH monitor and a DO monitor, which monitor and record the changes of pH value and DO in real time during the operation of the reactor. The aeration device 8 includes a blower, a rotor flowmeter and a microporous aerator of a sand-sticking block, which provides airflow through a blower, controls the gas flow through a rotor flowmeter, and adjusts the gas uniformity through a microporous aerator of a sand-sticking block.

[0031] The implementation principle of the nitrification and denitrification device of a factory-scale aquaculture circulating water system in the embodiment of the present application is as follows: the present application forms a two-stage batch reactor through a first reaction tank 2 and a second reaction tank 4, wherein the first reaction tank 2 is used as a short-range nitrification reactor and operates in an anaerobic / aerobic manner, synthesizing bacterial components through assimilation and denitrification, and finally reducing NOx- to N2 and releasing it into the atmosphere through dissimilatory denitrification; the second reaction tank 4 is used as an anaerobic ammonia oxidation granular sludge reactor, and ammonia oxidizing bacteria oxidize NH4+ to NO2-; both use a stirrer 7 to ensure that the mud-water mixture in the reactor is evenly distributed, so that the biochemical reaction is effectively carried out; and A portable pH and DO online detection recorder is used to monitor and record the pH and DO changes in real time during the operation of the reactor; the effluent of the first reaction tank 2 first enters the intermediate water tank 3 for standing, and then enters the second reaction tank 4 through the peristaltic pump 11. The second reaction tank 4 is anaerobic stirred, precipitated and drained, and its effluent flows into the effluent water tank 5. Part of the water in the effluent water tank 5 flows back to the first tank body, i.e., the short-range nitrification reactor, through the reflux pipe 6. The rest is the system effluent stored in the effluent water tank, and finally enters the aquaculture circulating water system. The reflux ratio of the water in the effluent water tank 5 can be adjusted according to the effluent water quality of the second tank body, i.e., the anaerobic ammonia oxidation granular sludge reactor. Through the nitrification and denitrification device, the sewage treatment effect in the circulating water aquaculture system can be improved at a lower energy consumption, with good economic and environmental benefits.

[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nitrification and denitrification device for a circulating water system of industrial aquaculture, characterized in that: The invention comprises a raw sewage tank (1), a first reaction tank (2), an intermediate water tank (3), a second reaction tank (4) and an outlet water tank (5); the raw sewage tank (1) is connected to the water inlet of the first reaction tank (2) through a pipeline; the water outlet of the first reaction tank (2) is connected to the intermediate water tank (3) through a pipeline; the intermediate water tank (3) is connected to the water inlet of the second reaction tank (4) through a pipeline; the water outlet of the second reaction tank (4) is connected to the outlet water tank (5) through a pipeline; a reflux pipeline (6) is further provided between the outlet water tank (5) and the first reaction tank (2); the first reaction tank (2) and the second reaction tank (4) are both transparent organic glass tank bodies; a stirrer (7) is installed on the top of the tank body facing the inside of the tank; the bottom of the first reaction tank (2) is connected to an aeration device (8); the first reaction tank (2) and the second reaction tank (4) are both provided with a detection module (9) and a temperature control module (10) inside.

2. The nitrification and denitrification device for a circulating water system of an industrial aquaculture according to claim 1, characterized in that: Peristaltic pumps (11) and one-way valves (12) are provided on the pipelines between the raw sewage tank (1), the first reaction tank (2), the intermediate water tank (3), the second reaction tank (4) and the outlet water tank (5).

3. The nitrification and denitrification device for a circulating water system of an industrial aquaculture according to claim 1, characterized in that: The outer walls of the first reaction tank (2) and the second reaction tank (4) are both vertically and evenly spaced with five sampling ports (13).

4. The nitrification and denitrification device for a circulating water system of an industrial aquaculture according to claim 1, characterized in that: The bottoms of the first reaction tank (2) and the second reaction tank (4) are both provided with three-phase mud discharge ports (14).

5. The nitrification and denitrification device for a circulating water system of an industrial aquaculture according to claim 1, characterized in that: The detection module (9) comprises a pH monitor and a DO monitor.

6. The nitrification and denitrification device for a circulating water system of an industrial aquaculture according to claim 1, characterized in that: The aeration device (8) comprises a blower, a rotor flowmeter and a sand-sticking block microporous aerator.

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