Black film biogas digester for breeding wastewater

Abstract

The utility model belongs to the technical field of cultivation wastewater treatment, and relates to a black film biogas digester for cultivation wastewater, which comprises a biogas digester, an impermeable film, a water distribution device, a fan and an aeration device, and the water distribution device and the aeration device are arranged in the biogas digester. The biogas digester has the beneficial effects that the water distribution device and the aeration device are arranged in the biogas digester, the water distribution branch pipes of the water distribution device generate hydraulic disturbance in the horizontal direction, and the vertical aeration holes formed in the aeration branch pipes of the aeration device generate hydraulic disturbance in the vertical direction; wastewater in the biogas digester is disturbed by hydraulic power in the horizontal direction and the vertical direction at the same time, so that the wastewater in the biogas digester is fully mixed, and the device is simple in structure, good in wastewater mixing and stirring effect and low in investment and operation cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of aquaculture wastewater treatment, in particular to a black film biogas pool for aquaculture wastewater. Background Art

[0002] Now more and more cattle farms, pig farms and other farms use impermeable membranes to make biogas digesters. From a distance, it looks like a black flying saucer, and from a close distance, it looks like a huge yurt. Impermeable membrane biogas digesters, also called black film biogas digesters, scientifically known as "fully enclosed anaerobic ponds", are an important part of the biogas production device in the farm. Black film biogas digesters are a practical application of anaerobic fermentation technology. They create an anaerobic environment by laying HDPE membranes with strong impermeability and prevent the leakage of biogas slurry and biogas. The top of the impermeable membrane exposed on the ground of the biogas digester is four or five meters high, and the water depth of the anaerobic pond is seven or eight meters. All the "floating" on the water is biogas. The impermeable membrane is like a pot cover, covering the biogas inside and preventing it from leaking out. The biogas produced by the black film biogas digester can be converted into electricity for lighting, cooking, and heat preservation of pig and cow sheds in the farm. The black film biogas digester has low investment cost, simple structure, low operating cost, good treatment effect and wide applicability. It also has certain environmental and economic benefits. In recent years, it has been widely used to treat high-concentration and difficult-to-treat organic wastewater such as pig farm wastewater.

[0003] Black film biogas digesters have the technical problem of uneven stirring. Some existing structural designs can solve the problem of uneven stirring, but the introduction of too much stirring equipment and complex structural design will not only greatly increase the investment cost of black film biogas digesters, but also increase the difficulty and cost of biogas digester operation and maintenance, and at the same time have a higher failure rate. Utility Model Content

[0004] The utility model aims to provide a black film biogas pool for aquaculture wastewater to solve the problem of uneven stirring in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A black film biogas pool for aquaculture wastewater comprises a biogas pool, an impermeable membrane, a water distribution device, a fan and an aeration device, wherein the impermeable membrane covers the pool wall and the top of the biogas pool, a biogas chamber is formed between the impermeable membrane and the water surface of the biogas pool, the fan is used to transport the biogas in the biogas chamber to the aeration device, and a wastewater inlet and an aeration port are provided at the lower part of the pool wall of the biogas pool.

[0007] The water distribution device and the aeration device are arranged in the biogas tank.

[0008] The aeration device includes an aeration main pipe and a plurality of parallel aeration branch pipes, the air inlet ends of the aeration branch pipes are respectively connected to the aeration main pipe, a plurality of vertical aeration holes are arranged at intervals on the aeration branch pipes, the input end of the fan is connected to the biogas chamber through an air inlet pipe, the output end of the fan is connected to the aeration main pipe through an air outlet pipe, an air inlet valve is arranged on the air outlet pipe, and the air outlet pipe is passed through the aeration port.

[0009] The water distribution device includes a water distribution main pipe and multiple water distribution branch pipes. The multiple water distribution branch pipes are arranged in parallel with each other. The water distribution branch pipes extend in a horizontal direction. The water inlet ends of the water distribution branch pipes are respectively connected to the water distribution main pipe. The water inlet pipes are provided with a water inlet pump and a water inlet valve. The water inlet pipes are inserted into the wastewater inlet port, and the water outlet ends of the water inlet pipes are connected to the water distribution main pipe.

[0010] The utility model has at least the following beneficial effects: by arranging a water distribution device and an aeration device in a biogas tank, each water distribution branch pipe of the water distribution device generates hydraulic disturbance in the horizontal direction, and the vertical aeration holes arranged on the aeration branch pipes of the aeration device generate hydraulic disturbance in the vertical direction, and the wastewater in the biogas tank is subjected to hydraulic disturbance in the horizontal direction (water distribution device) and the vertical direction (aeration device) at the same time, so that the wastewater in the biogas tank can be fully mixed. The utility model has a simple structure, good wastewater mixing and stirring effect, and low investment and operation costs.

[0011] In one of the embodiments, it also includes a mud discharge device, which includes a mud discharge main pipe and a plurality of mud discharge branch pipes, each of the mud discharge branch pipes is respectively connected to the mud discharge main pipe, a mud discharge valve is provided on the mud discharge branch pipe, and a mud discharge pump is provided on the mud discharge main pipe. The biogas tank is provided with a plurality of mud discharge ports for the mud discharge branch pipes to pass through, and the mud discharge ports are located at the lower part of another pool wall opposite to the pool wall where the wastewater inlet is located. A plurality of mud collecting grooves are provided at the bottom of the biogas tank, each of the mud collecting grooves corresponds to the position of each mud discharge branch pipe, one end of the mud collecting groove extends to the water outlet end of the water distribution branch pipe, and the other end of the mud collecting groove extends to the mud discharge port.

[0012] Furthermore, the depth of the mud collecting ditch gradually increases and the width of the mud collecting ditch gradually narrows along the direction from the wastewater inlet to the mud discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 This is a schematic structural diagram of a black film biogas digester for aquaculture wastewater according to an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of an aeration device for a black film biogas pool for aquaculture wastewater according to an embodiment of the utility model;

[0016] Figure 3 It is a schematic structural diagram of a water distribution device and a mud discharge device of a black film biogas pool for aquaculture wastewater according to an embodiment of the utility model.

[0017] Among them, the reference numerals in the figure are:

[0018] 1. Biogas tank; 10. Biogas chamber; 100. Biogas exhaust port; 101. Wastewater inlet; 102. Mud discharge port; 103. Aeration port; 2. Impermeable membrane; 3. Aeration device; 31. Aeration main pipe; 32. Aeration branch pipe; 4. Fan; 41. Air inlet pipe; 42. Air outlet pipe; 5. Water distribution device; 501. Water inlet pipe; 51. Water distribution pipe; 52. Water distribution branch pipe; 61. Air inlet valve; 62. Water inlet valve; 63. Mud discharge valve; 71. Water inlet pump; 72. Mud discharge pump; 8. Mud discharge device; 81. Mud discharge main pipe; 82. Mud discharge branch pipe; 9. Mud collecting ditch. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figures 1-2 As shown, the black film biogas tank for aquaculture wastewater provided by the utility model comprises a biogas tank 1, an impermeable membrane 2, a water distribution device 5, a fan 4 and an aeration device 3. The biogas tank 1 is a tank body with a square bottom surface. The impermeable membrane 2 covers the tank wall and the top of the biogas tank 1. The biogas generated by the biogas tank 1 lifts up the impermeable membrane 2. A biogas chamber 10 is formed between the impermeable membrane 2 and the water surface of the biogas tank 1. The fan 4 is used to transport the biogas in the biogas chamber 10 to the aeration device. The biogas tank 1 is provided with a wastewater inlet 101 and an aeration port 103. The wastewater inlet is provided at a certain distance near the bottom of the lower part of the tank wall of the biogas tank, and the aeration port 103 is located at a certain distance next to the wastewater inlet 101.

[0024] The water distribution device 5 and the aeration device 3 are arranged in the biogas tank 1. The aeration device 3 includes an aeration main pipe 31 and a plurality of parallel aeration branch pipes 32. The air inlet ends of the aeration branch pipes 32 are respectively connected to the aeration main pipe 31. The aeration branch pipes 32 are provided with a plurality of vertical aeration holes (not shown in the figure) at intervals. The input end of the fan 4 is connected to the biogas chamber 10 through the air inlet pipe 41. The output end of the fan 4 is connected to the aeration main pipe 31 through the air outlet pipe 42. The air outlet pipe 42 is provided with an air inlet valve 61. The air outlet pipe 42 is passed through the aeration port 103 of the biogas tank 1.

[0025] The water distribution device 5 includes a water distribution main pipe 51 and a plurality of water distribution branch pipes 52. The plurality of water distribution branch pipes 52 are arranged in parallel with each other. The water distribution branch pipes 52 extend in the horizontal direction. The water inlet ends of the water distribution branch pipes 52 are respectively connected to the water distribution main pipe 51. The water inlet pipe 501 is provided with a water inlet pump 71 and a water inlet valve 62. The water inlet pipe 501 is passed through the wastewater inlet 101 of the biogas tank 1. The water outlet end of the water inlet pipe 501 is connected to the water distribution main pipe 51.

[0026] The beneficial effects of the utility model are as follows: by arranging a water distribution device 5 and an aeration device 3 in the biogas tank 1, each water distribution branch pipe 52 of the water distribution device 5 generates hydraulic disturbance in the horizontal direction, and the vertical aeration holes arranged in the aeration branch pipe 32 of the aeration device 3 generate hydraulic disturbance in the vertical direction, and the wastewater in the biogas tank 1 is subjected to hydraulic disturbance in the horizontal direction (water distribution device) and the vertical direction (aeration device) at the same time, so that the wastewater in the biogas tank 1 can be fully mixed. The utility model has a simple structure, good wastewater mixing and stirring effect, and low investment and operation costs.

[0027] In one embodiment, the anti-seepage membrane 2 can be made of a high-density polyethylene (HDPE) membrane with strong anti-seepage ability.

[0028] In one embodiment, a biogas exhaust port 100 communicating with the biogas chamber 10 is provided at a certain position on the upper part of the wall of the biogas tank 1 .

[0029] In one embodiment, the fan 4 can adopt a magnetic levitation blower with mature technology. The magnetic levitation blower is a mechanical device for conveying gas, which adopts core technologies such as magnetic levitation bearings, three-dimensional flow impellers, high-speed permanent magnet synchronous motors, high-efficiency inverter speed regulation, and intelligent monitoring and control. When starting, it first suspends and then rotates, without friction, without lubrication, and the three-dimensional flow impeller is directly connected to the rotor, with zero transmission loss.

[0030] In one embodiment, the length of the water distribution branch pipe 52 accounts for 30%-60% of the width of the biogas tank 1 . Optionally, the length of the water distribution branch pipe 52 accounts for half of the width of the biogas tank 1 .

[0031] In one embodiment, there are two water inlet pipes 501, and both water inlet pipes 501 are provided with a water inlet pump 71 and a water inlet valve 62, one for backup and one for use, to prevent the water treatment condition from being able to operate normally when the components on one of the water inlet pipes are broken.

[0032] In one of the embodiments, in order to solve the technical problem of the difficulty in discharging mud from the existing black mud biogas pool, the utility model further includes a mud discharge device 8, which includes a mud discharge main pipe 81 and multiple mud discharge branch pipes 82, each mud discharge branch pipe 82 is connected to the mud discharge main pipe 81, a mud discharge valve 63 is provided on the mud discharge branch pipe 81, and a mud discharge pump 73 is provided on the mud discharge main pipe 81. The biogas pool 1 is provided with multiple mud discharge ports 102 for the mud discharge branch pipes 82 to pass through, and the mud discharge port 102 is located at a certain distance from the bottom of the lower part of the other pool wall opposite to the pool wall where the wastewater inlet 101 is located. The bottom of the biogas pool 1 is provided with multiple mud collecting grooves 9, and each mud collecting groove 9 corresponds to the position of each mud discharge branch pipe 82. One end of the sludge collecting ditch 9 extends to the outlet end of the water distribution branch pipe 52, and the other end of the sludge collecting ditch 9 extends to the sludge discharge port 102. The depth of the sludge collecting ditch 9 gradually increases from the wastewater inlet 101 to the sludge discharge port 102, and the width of the sludge collecting ditch 9 gradually narrows. The water distribution device 5 can generate lateral hydraulic disturbances, and the suspended sludge moves toward the sludge collecting ditch 9 while settling downward, and gathers at the sludge collecting ditch 9, and is discharged from the biogas tank 1 through the sludge discharge port 102, thereby preventing a large amount of sludge from accumulating at the bottom of the tank.

[0033] The mud discharge valve 63 on the mud discharge branch pipe 82 is in a normally closed state. When mud discharge is required, the mud discharge valve 63 is opened alternately, and the mud discharge valve 63 is linked with the mud discharge pump 72. The mud discharge pump 72 is a screw pump.

[0034] When water treatment is in progress, the water inlet valve 62 and the air inlet valve 61 are in the open state, all the mud discharge valves 63 are in the closed state, the water inlet pump 71 is turned on, and the wastewater is transported to the water distribution device 5 through the water inlet pump 71, and evenly enters the biogas tank 1 after being diverted by the water distribution device 5; at the same time, the fan 4 is turned on, and the biogas in the biogas chamber above the biogas tank 1 is transported to the aeration device 3 through the magnetic levitation blower. The wastewater in the biogas tank 1 is subjected to hydraulic disturbances in the horizontal direction (water distribution device) and the vertical direction (aeration device), and the wastewater in the tank is fully mixed.

[0035] When mud discharge is in progress, the water inlet valve 62 is opened, and only the mud discharge valve 63 on one of the mud discharge branches is opened, while the other mud discharge valves 63 are closed, the air inlet valve 61 and the fan 4 are closed, and the mud discharge pump 72 is turned on. At this time, a lateral (water distribution device) hydraulic disturbance is generated in the pool from the wastewater inlet 101 to the mud discharge port 102, and the suspended sludge moves toward the mud collecting ditch 9 while settling downward, and gathers at the mud collecting ditch 9 and is discharged from the biogas pool through the mud discharge port 102.

[0036] Aiming at the problems of uneven stirring and difficult sludge discharge in the existing black film biogas pool, the utility model has a good wastewater mixing and stirring effect by designing a reasonable water distribution device 5, an aeration device 3 and a sludge discharge device 8 on the basis of relatively low investment cost, and effectively prevents the large amount of sludge accumulation at the bottom of the pool, and has a strong practical application value.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A black film biogas digester for aquaculture wastewater, characterized in that: It comprises a biogas tank, an impermeable membrane, a water distribution device, a fan and an aeration device, wherein the impermeable membrane covers the wall and top of the biogas tank, a biogas chamber is formed between the impermeable membrane and the water surface of the biogas tank, the fan is used to transport the biogas in the biogas chamber to the aeration device, and a wastewater inlet and an aeration port are provided at the lower part of the wall of the biogas tank; The water distribution device and the aeration device are arranged in the biogas tank; The aeration device comprises an aeration main pipe and a plurality of parallel aeration branch pipes, the air inlet ends of the aeration branch pipes are respectively connected to the aeration main pipe, the aeration branch pipes are provided with a plurality of vertical aeration holes at intervals, the input end of the fan is connected to the biogas chamber through an air inlet pipe, the output end of the fan is connected to the aeration main pipe through an air outlet pipe, the air outlet pipe is provided with an air inlet valve, and the air outlet pipe is passed through the aeration port; The water distribution device includes a water distribution main pipe and multiple water distribution branch pipes. The multiple water distribution branch pipes are arranged in parallel with each other. The water distribution branch pipes extend in a horizontal direction. The water inlet ends of the water distribution branch pipes are respectively connected to the water distribution main pipe. A water inlet pump and a water inlet valve are provided on the water inlet pipe. The water inlet pipe is inserted into the wastewater inlet port, and the water outlet end of the water inlet pipe is connected to the water distribution main pipe.

2. The black film biogas digester for aquaculture wastewater according to claim 1, characterized in that: It also includes a mud discharge device, which includes a mud discharge main pipe and a plurality of mud discharge branch pipes, each of the mud discharge branch pipes is respectively connected to the mud discharge main pipe, a mud discharge valve is provided on the mud discharge branch pipe, and a mud discharge pump is provided on the mud discharge main pipe. The biogas tank is provided with a plurality of mud discharge ports for the mud discharge branch pipes to pass through, and the mud discharge ports are located at the lower part of another pool wall opposite to the pool wall where the wastewater inlet is located. A plurality of mud collecting grooves are provided at the bottom of the biogas tank, each of the mud collecting grooves corresponds to the position of each mud discharge branch pipe, one end of the mud collecting groove extends to the water outlet end of the water distribution branch pipe, and the other end of the mud collecting groove extends to the mud discharge port.

3. The black film biogas digester for aquaculture wastewater according to claim 2, characterized in that: The depth of the mud collecting ditch gradually increases along the direction from the wastewater inlet to the mud discharge port, and the width of the mud collecting ditch gradually narrows.

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