Continuous flow continuous batch reactor for fishery breeding wastewater treatment

Abstract

The utility model discloses a continuous flow continuous batch reactor for treating fishery breeding wastewater. The continuous flow continuous batch reactor for treating fishery breeding wastewater comprises a sewage collecting tank, a first aeration tank and a second aeration tank which are connected in sequence, the sewage collecting pond is also connected with a fishery culture pond; a water inlet is formed in the upper part of the first aeration tank, and water in the sewage collecting tank is controlled to enter the first aeration tank through a buoyancy control valve of the water inlet; aeration pipes are arranged in the first aeration tank, each aeration pipe is of a cylindrical structure, and the number of the aeration pipes is 20-40; a jet flow and micropore aeration device is arranged at the bottom of the second aeration tank. The reactor disclosed by the utility model adopts a two-tank design, the water flow speed is controlled through the buoyancy control valve and the drain hole of the first aeration tank, fishpond culture water can enter different reactors in a continuous flow manner by utilizing gravity, and the water inlet energy consumption and overflow are reduced.

Description

Technical Field

[0001] The utility model relates to the field of fishery breeding wastewater treatment devices, in particular to a continuous flow batch reactor for fishery breeding wastewater treatment. Background Art

[0002] Aerobic granular sludge (AGS) is a new type of environmental biotechnology. It has been successfully cultivated using a sequencing batch reactor (SBR) and has received great attention. It uses a short sedimentation time to quickly select microbial aggregates with fast sedimentation, promote the formation of dense polymers in activated sludge, and complete the separation of AGS in the reactor, which not only greatly reduces the scale of the sewage treatment plant, but also saves the secondary sedimentation tank, which has the advantage of saving land. At present, there are still few studies on the successful cultivation of AGS in medium and low concentration sewage by SBR, and there is a lack of unified understanding of the formation and characteristics of AGS, and the structure and function of microbial communities. The pollutants in aquaculture water bodies mainly include organic matter, ammonia nitrogen, nitrite, nitrate and phosphorus and other nutrients. The main characteristics of water bodies are large water volume, fewer types of pollutants and small changes in content. Most aquaculture wastewater is slightly polluted water with relatively low pollution load. This patent adopts the method of aquaculture pollutant accumulation, batch discharge and continuous water inflow for the first time based on the aggregation and formation rules of AGS microorganisms and the characteristics of wastewater and pollution emissions from fishery aquaculture. At the same time, it uses sub-tanks, adds aeration pipes, different aeration and starvation saturation control processes to improve the efficiency of aerobic granular sludge granulation and contact with pollutants, effectively solving the problem of denitrification and phosphorus removal in low-load aquaculture wastewater. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the utility model proposes a continuous flow batch reactor for treating fishery wastewater.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A continuous flow batch reactor for treating fishery wastewater, comprising a sewage collection tank, a first aeration tank and a second aeration tank connected in sequence;

[0006] The sewage collection tank is also connected to the fishery breeding pond;

[0007] The first aeration tank is provided with a water inlet at the top, and the water in the sewage collection tank is controlled by the buoyancy control valve of the water inlet to flow into the first aeration tank; the first aeration tank is provided with an aeration pipe inside, the aeration pipe is a cylindrical structure, and the number of the aeration pipes is 20-40;

[0008] The bottom of the second aeration tank is provided with a jet and microporous aeration device.

[0009] Preferably, the sewage collection tank has a length×width×height dimension of 0.75×2×2.8 m, the first aeration tank has a length×width×height dimension of 1.5×2×2.8 m, and the second aeration tank has a length×width×height dimension of 4.5×2×2.8 m.

[0010] Preferably, the diameter×height of the aeration tube is (0.15-0.25)×(2-2.5) m. In some specific embodiments of the present invention, the diameter of the aeration tube is 0.2 m and the height is 2.4 m. The aeration tube is made of PVC.

[0011] Preferably, the number of the aeration tubes is 28.

[0012] Preferably, a drainage hole is provided at the bottom of the first aeration tank, and the water in the first aeration tank is discharged through the bottom drainage hole.

[0013] Preferably, a photovoltaic panel is provided on the top of the first aeration tank, which can provide energy to maintain the water temperature of the reaction tank and the stability of the activated sludge at low temperatures.

[0014] Preferably, a water inlet is provided at the bottom of the second aeration tank.

[0015] Preferably, a water outlet is provided in the middle of the side of the second aeration tank.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The reactor of the utility model adopts a two-tank design, and the water flow rate is controlled by a buoyancy control valve and a drainage hole of the first aeration tank. The fish pond aquaculture water can enter different reactors in a continuous flow manner by gravity, thereby reducing water entry energy consumption and overflow.

[0018] The two tanks of the reactor are designed with different sizes and water entering from the top of the first aeration tank, which can make the pollutant concentration in the first aeration tank higher than that in the second aeration tank. Combined with dissolved oxygen control, the two tanks are formed into starvation and saturation states respectively, which is more conducive to inhibiting the growth of filamentous bacteria and maintaining the stability of the activated sludge particle structure. At the same time, the method of using the first aeration tank for water inlet and the second aeration tank for water outlet reduces the effluent mixing degree and improves the sewage treatment efficiency.

[0019] The first aeration tank uses a specific aeration pipe structure (constructed with 20 cm PVC pipes) to increase the diameter-to-height ratio of aerobic granular sludge and significantly reduce the height of the reaction tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The invention relates to a continuous flow batch reactor for treating fishery wastewater according to an embodiment.

[0021] Figure numerals: 100 - fishery breeding pond, 200 - sewage collection tank, 300 - first aeration tank, 301 - buoyancy control valve, 302 - aeration pipe, 303 - drainage hole, 400 - second aeration tank, 401 - jet, microporous aeration device. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0023] The present invention is further described in detail below through specific embodiments.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it 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, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Unless otherwise specified, the raw materials, reagents or devices used in the examples can be obtained from conventional commercial sources or can be obtained by prior art methods. Unless otherwise specified, the experiments or test methods are conventional methods in the art.

[0026] The utility model of the continuous flow batch reactor for fishery wastewater treatment is as shown in the attached Figure 1 As shown, it includes a sewage collecting tank 200, a first aeration tank 300 and a second aeration tank 300 which are connected in sequence; the sewage collecting tank 200 is also connected to the fishery breeding pond 100; a water inlet is provided at the upper part of the first aeration tank 300, and the water in the sewage collecting tank 200 is controlled by a buoyancy control valve 301 at the water inlet to enter the first aeration tank 300; an aeration pipe 302 is provided inside the first aeration tank 300, and the aeration pipe 302 is a cylindrical structure, and the number of the aeration pipes 302 is 20-40; a jet and microporous aeration device 401 is provided at the bottom of the second aeration tank 400.

[0027] Example

[0028] In this embodiment, the length×width×height of the first aeration tank is 1.5×2×2.8m, the length×width×height of the second aeration tank is 4.5×2×2.8m, and the length×width×height of the sewage collection tank is 0.75×2×2.8m.

[0029] The diameter and height of the aeration pipe in the first aeration tank are 0.2×2.4m, with 4×7 aeration pipes. The second aeration tank adopts jet and micropore mixed aeration. The hydraulic retention time is set to 4 hours, and the daily water output is 70-90 tons. The device is used to treat fish farming wastewater, and the test is carried out continuously for 5 months. The average water quality of the inlet and outlet water from August to December of a certain year is shown in Table 1 below.

[0030] Table 1

[0031]

[0032] It can be seen from the data in Table 1 that the reactor of the utility model has an excellent treatment effect on aquaculture wastewater.

[0033] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A continuous flow batch reactor for treating fishery wastewater, characterized in that: It includes a sewage collection tank, a first aeration tank and a second aeration tank connected in sequence; The sewage collection tank is also connected to the fishery breeding pond; The first aeration tank is provided with a water inlet at the top, and the water in the sewage collection tank is controlled by the buoyancy control valve of the water inlet to flow into the first aeration tank; the first aeration tank is provided with an aeration pipe inside, the aeration pipe is a cylindrical structure, and the number of the aeration pipes is 20-40; The bottom of the second aeration tank is provided with a jet and microporous aeration device.

2. The continuous flow batch reactor for treating fishery wastewater according to claim 1, characterized in that: The length×width×height dimensions of the sewage collection tank are 0.75×2×2.8 m, the length×width×height dimensions of the first aeration tank are 1.5×2×2.8 m, and the length×width×height dimensions of the second aeration tank are 4.5×2×2.8 m.

3. The continuous flow batch reactor for treating fishery wastewater according to claim 1, characterized in that: The diameter×height of the aeration pipe is (0.15-0.25)×(2-2.5) m.

4. The continuous flow batch reactor for treating fishery wastewater according to claim 1, characterized in that: A drainage hole is provided at the bottom of the first aeration tank, and the water in the first aeration tank is discharged through the drainage hole at the bottom.

5. The continuous flow batch reactor for treating fishery wastewater according to claim 1, characterized in that: A water outlet is provided in the middle of the side of the second aeration tank.

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