Livestock wastewater biochemical treatment device

Abstract

The utility model provides a kind of livestock and poultry wastewater biochemical treatment device, including sequentially connected first ABR combined pool, second ABR combined pool, ABR sedimentation tank, first aerobic tank, anaerobic tank, second aerobic tank and OAO sedimentation tank, first ABR combined pool is connected with wastewater inlet conduit, first sludge return pipe is set in ABR sedimentation tank and the water inlet end of second ABR combined pool is interconnected, OAO sedimentation tank is provided with second sludge return pipe and the water inlet end of first aerobic tank is interconnected;Wastewater scum is collected in collecting cylinder, wastewater enters first ABR combined pool, hydrolytic acidification is carried out to wastewater, enters second ABR combined pool, second ABR combined pool is connected with first sludge return pipe, forms UASB technology, organic matter is oxidized and decomposed and purified, wastewater enters first aerobic tank, and the effect of intensification treatment is handled, wastewater enters anaerobic tank, second aerobic tank and OAO sedimentation tank in turn, second sludge return pipe is interconnected with first aerobic tank, and the active sludge reaction process is accelerated, and the reaction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of livestock wastewater treatment, and in particular to a biochemical treatment device for livestock and poultry wastewater. Background Technology

[0002] Livestock and poultry wastewater mainly refers to urine, feces, and feed residue produced in farms, as well as flushing water generated during the washing process and wastewater generated during workers' daily life and production. The quality and quantity of livestock and poultry wastewater vary greatly, and it contains some pathogens and is accompanied by a foul odor, making it difficult to treat. However, the wastewater has high COD and BOD content, good biodegradability, and good sedimentation properties after certain treatment.

[0003] There are various technologies for treating wastewater from livestock and poultry farms both domestically and internationally. Based on the main body and combination of processes, they can be divided into two treatment modes: those based on physicochemical treatment and those based on biochemical treatment.

[0004] Physicochemical treatment requires a large amount of chemical reagents and physical equipment, resulting in high energy consumption and increased costs. Furthermore, it demands precise operation and control, is labor-intensive, complex, and time-consuming. Conventional biological treatment, on the other hand, suffers from inconsistent treatment results due to variations in wastewater volume, water quality impact, or high levels of suspended solids in the influent. Utility Model Content

[0005] This utility model aims to provide a biochemical treatment device for livestock and poultry wastewater, which is low in cost and energy consumption, improves the stability of effluent quality, enhances treatment effect, and can stably meet discharge standards.

[0006] Therefore, the technical solution adopted by this utility model is as follows: a biological treatment device for livestock and poultry wastewater, comprising a first ABR combined tank and a second ABR combined tank connected in sequence. The first ABR combined tank is connected to a wastewater inlet pipe, and the outlet pipe of the second ABR combined tank is connected to an ABR sedimentation tank. The outlet pipe of the ABR sedimentation tank is connected to a first aerobic tank, and the outlet pipe of the first aerobic tank is connected to an anaerobic tank. The outlet pipe of the anaerobic tank is connected to a second aerobic tank, and the outlet pipe of the second aerobic tank is connected to an OAO sedimentation tank. A first sludge return pipe is provided in the ABR sedimentation tank and connected to the inlet of the second ABR combined tank. A second sludge return pipe is provided in the OAO sedimentation tank and connected to the inlet of the first aerobic tank.

[0007] As a preferred embodiment of the above scheme, both the first ABR combination tank and the second ABR combination tank are composed of three ABR tanks connected in series. The wastewater inlet pipe is connected to the first ABR tank of the first ABR combination tank, and the first return pipe is connected to the first ABR tank of the second ABR combination tank.

[0008] More preferably, both the first sludge return pipe and the second sludge return pipe are equipped with air-lift devices.

[0009] More preferably, the inlet end of the wastewater inlet pipe is connected to a collection cylinder for collecting foam, the bottom of the collection cylinder is provided with a wastewater collection pipe, the top of the side wall is provided with a wastewater outlet pipe, the bottom of the collection cylinder is provided with an aeration disc, the top of the collection cylinder is provided with a collection cover for collecting foam, the collection cover is conical, the inlet end of the wastewater outlet pipe extends downward to below the liquid surface, the collection cover is provided with a foam collection pipe, and the wastewater outlet pipe is connected to the wastewater inlet pipe.

[0010] More preferably, each of the first and second ABR combination tanks is provided with an overflow plate. The overflow plate is located in the ABR tank near the water inlet side, forming an overflow trough with the side wall of the water inlet side. The distance between the overflow plate and the side wall of the water inlet side of the ABR tank is between 110 and 130 mm.

[0011] More preferably, the height of the overflow plate decreases by 8 to 12 mm according to the connection sequence of the ABR pool.

[0012] More preferably, the first aerobic tank is a two-stage tank connected in series, and both the first and second aerobic tanks are equipped with aeration devices.

[0013] More preferably, a DC power supply workbench is provided in the second aerobic tank. The DC power supply workbench is connected to the cathode and anode in the second aerobic tank via wires. The anode is made of iron and / or magnesium, and the cathode is made of stainless steel. There are two or more sets of cathodes and anodes, with the cathode and anode electrodes arranged alternately. The anode is made of iron or magnesium. A stirring structure is provided in the second aerobic tank. A calcium oxide adding device is provided above the second aerobic tank.

[0014] Before entering the device, the wastewater undergoes pretreatment (filtration, etc.) to remove most of the suspended solids (SS). The wastewater then enters a collection tank for flotation, where the resulting scum is collected to prevent excessive accumulation in the subsequent aerobic tank, which would be difficult to clean. After flotation, the wastewater enters the first ABR combined tank for reaction, adjusting water quality and quantity, and undergoing hydrolysis and acidification. It then enters the second ABR combined tank, where it mixes with sludge returned from the ABR sedimentation tank, forming a process similar to UASB treatment, initially decomposing the organic matter in the wastewater. After passing through the ABR sedimentation tank, the wastewater enters the first aerobic tank, a two-stage aerobic tank designed to enhance treatment efficiency. The wastewater then sequentially enters the anaerobic tank, the second aerobic tank, and the OAO sedimentation tank. The OAO sedimentation tank is equipped with a second sludge return pipe connected to the first aerobic tank, accelerating the activated sludge reaction process, improving reaction efficiency, and promoting rapid separation of pollutants. Ultimately, this ensures that the biochemical wastewater from the treatment device can be discharged in a stable manner that meets the discharge standards (Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002)). Attached Figure Description

[0015] Figure 1 This is a flowchart of the present invention.

[0016] Figure 2 This is a structural diagram of the collecting cylinder in this utility model.

[0017] Figure 3 This is a schematic diagram of the electrochemical reaction structure in the second aerobic tank of this utility model.

[0018] Figure 4 This is a schematic diagram of the installation structure of this utility model. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1-4 As shown, a biochemical treatment device for livestock and poultry wastewater includes a first ABR combined tank 1 and a second ABR combined tank 2 connected in sequence. The first ABR combined tank 1 is connected to a wastewater inlet pipe. The outlet pipe of the second ABR combined tank 2 is connected to an ABR sedimentation tank 3. The outlet pipe of the ABR sedimentation tank 3 is connected to a first aerobic tank 4. The outlet pipe of the first aerobic tank 4 is connected to an anaerobic tank 5. The outlet pipe of the anaerobic tank 5 is connected to a second aerobic tank 6. The outlet pipe of the second aerobic tank 6 is connected to an OAO sedimentation tank 7. A first sludge return pipe 8 is installed in the ABR sedimentation tank 3 and connected to the inlet of the second ABR combined tank 2. A second sludge return pipe 9 is installed in the OAO sedimentation tank 7 and connected to the inlet of the first aerobic tank 4.

[0021] Both the first ABR combination tank 1 and the second ABR combination tank 2 are composed of three ABR tanks connected in series. The wastewater inlet pipe is connected to the first ABR tank of the first ABR combination tank 1, and the first return pipe is connected to the first ABR tank of the second ABR combination tank 2. Both the first sludge return pipe 8 and the second sludge return pipe 9 are equipped with air-lift devices.

[0022] The inlet end of the wastewater inlet pipe is connected to a collection cylinder 10 for collecting foam. A wastewater collection pipe 11 is provided at the bottom of the collection cylinder 10, and a wastewater outlet pipe 12 is provided at the top of the side wall. An aeration disc 13 is provided at the bottom of the collection cylinder 10, and a collection cover 14 for collecting foam is provided at the top of the collection cylinder 10. The collection cover 14 is conical. The inlet end of the wastewater outlet pipe 12 extends downward to below the liquid surface. A foam collection pipe 15 is provided on the collection cover 14. The wastewater outlet pipe 12 is connected to the wastewater inlet pipe.

[0023] During the biological treatment stage of wastewater, the surface tension of the aerated water increases, leading to foam formation. Due to the high organic content in the wastewater, the foam becomes sticky and accumulates in the OAO aerobic tanks 4 and 6, making it difficult to clean. The collection cylinder 10 collects the foam from the wastewater before it enters the biological treatment stage, preventing excessive accumulation in the OAO aerobic tanks 4 and 6, facilitating cleaning. Furthermore, because of the high organic content in the wastewater, the collected foam can be used as organic fertilizer after treatment, improving wastewater utilization. Experiments showed that without the collection cylinder 10, a large amount of foam would accumulate in the OAO aerobic tanks 4 and 6, overflowing into the work area. Adding the collection cylinder 10 significantly reduced the amount of foam in the OAO aerobic tanks 4 and 6.

[0024] Each of the first ABR combination tank 1 and the second ABR combination tank 2 is equipped with an overflow plate 16. The overflow plate 16 is located in the ABR tank near the water inlet side, forming an overflow trough with the side wall of the water inlet side. The distance between the overflow plate 16 and the side wall of the water inlet side of the ABR tank is between 110 and 130 mm.

[0025] The height of the overflow plate 16 decreases by 8-12 mm sequentially according to the connection order of the ABR tanks. The progressively decreasing height of the overflow plate 16 facilitates the sequential flow of wastewater to the next ABR tank.

[0026] A first ABR combination tank 1 and a second ABR combination tank 2 are set up, and a first sludge return pipe 8 is added to the ABR sedimentation tank 3. The sludge is returned to the second ABR combination tank 2 by an air-lift device, which has low energy consumption. By connecting the second sludge return pipe 9 to the inlet end of the second ABR combination tank 2, the second ABR combination tank 2 is made to resemble a UASB reactor, which is safer to use; traditional UASB tanks are very tall, mostly over 16m, posing a great safety hazard.

[0027] The first aerobic tank 4 consists of two stages connected in series. Both the first aerobic tank 4 and the second aerobic tank 6 are equipped with an aeration device 604 (this is existing technology and will not be described in detail here).

[0028] The first aerobic tank 4 is designed as a two-stage aerobic tank, which makes the removal of organic matter more efficient; improves the stability of the effluent quality, meets stricter discharge standards, and achieves breakthroughs in the treatment of different pollutants, thus improving the treatment effect.

[0029] To achieve better treatment results, a DC power supply workbench (not shown in the figure) is installed in the second aerobic tank 6. The DC power supply workbench is connected to the cathode 601 and anode 602 installed in the second aerobic tank 6 via wires. The anode 602 is made of iron and / or magnesium, and the cathode 601 is made of stainless steel. There are two or more sets of cathodes 601 and anodes 602, with the cathode 601 and anode electrodes arranged alternately. If the anode 602 is made of iron and magnesium, the magnesium electrode and iron electrode are arranged alternately. A stirring structure 603 is installed in the second aerobic tank 6. Stirring is required at the beginning of the reaction. A motor (not shown in the figure) is installed above the stirring structure 603, which drives the stirring blades below to rotate. A calcium oxide addition device may also be installed above the second aerobic tank 6.

[0030] Besides magnesium and iron, any active metal material can be used as an anode. When magnesium is used as an anode, struvite can be generated during the reaction.

[0031] Because the suspended solids content in livestock and poultry wastewater is too high, as are the nitrogen and phosphorus content, an electrochemical device is added. Through electrochemical reactions combined with calcium oxide and / or air flotation, the suspended solids in the wastewater are further removed and precipitated. At the same time, residual nitrogen and phosphorus can also be further removed, achieving a better treatment effect.

[0032] Before entering the device, the wastewater undergoes pretreatment (filtration, etc.) to remove most of the suspended solids (SS). The wastewater then enters the collection tank 10 for air flotation, where the scum generated after air flotation is collected to prevent excessive accumulation of scum in the sedimentation tank, which would be difficult to clean. After air flotation, the wastewater enters the first ABR combined tank 1 for reaction, adjusting the water quality and quantity, and undergoing hydrolysis and acidification. It then enters the second ABR combined tank 2, where the wastewater mixes with the sludge returned from the ABR sedimentation tank 3, forming a process similar to UASB treatment, oxidizing and decomposing the organic matter in the wastewater for purification. After passing through the ABR sedimentation tank 3, the wastewater enters the first aerobic tank 4, which is a two-stage aerobic tank to enhance the treatment effect. The wastewater then sequentially enters the anaerobic tank 5, the second aerobic tank 6, and the OAO sedimentation tank 7. The OAO sedimentation tank 7 is equipped with a second sludge return pipe 9 connected to the first aerobic tank 4, which accelerates the activated sludge reaction process, improves reaction efficiency, and promotes the rapid separation of impurity particles. Ultimately, this ensures that the biochemical wastewater from the treatment device can be discharged in a stable manner that meets the discharge standards (Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB18918-2002)).

[0033] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A biochemical treatment device for livestock and poultry wastewater, characterized in that: The system includes a first ABR combined tank (1) and a second ABR combined tank (2) connected in sequence. The first ABR combined tank (1) is connected to a wastewater inlet pipe. The outlet pipe of the second ABR combined tank (2) is connected to an ABR sedimentation tank (3). The outlet pipe of the ABR sedimentation tank (3) is connected to a first aerobic tank (4). The outlet pipe of the first aerobic tank (4) is connected to an anaerobic tank (5). The outlet pipe of the anaerobic tank (5) is connected to a second aerobic tank (6). The outlet pipe of the second aerobic tank (6) is connected to an OAO sedimentation tank (7). A first sludge return pipe (8) is installed in the ABR sedimentation tank (3) and connected to the inlet of the second ABR combined tank (2). A second sludge return pipe (9) is installed in the OAO sedimentation tank (7) and connected to the inlet of the first aerobic tank (4).

2. The biochemical treatment device for livestock and poultry wastewater according to claim 1, characterized in that: The first ABR combination tank (1) and the second ABR combination tank (2) are both composed of three ABR tanks connected in series. The wastewater inlet pipe is connected to the first ABR tank of the first ABR combination tank (1), and the first sludge return pipe (8) is connected to the first ABR tank of the second ABR combination tank (2).

3. The biochemical treatment device for livestock and poultry wastewater according to claim 2, characterized in that: Both the first sludge return pipe (8) and the second sludge return pipe (9) are equipped with air lifting devices.

4. The biochemical treatment device for livestock and poultry wastewater according to claim 1, characterized in that: The wastewater inlet pipe is connected to a collection cylinder (10) for collecting foam at its inlet end. A wastewater collection pipe (11) is provided at the bottom of the collection cylinder (10), and a wastewater outlet pipe (12) is provided at the top of the side wall. An aeration disc (13) is provided at the bottom of the collection cylinder (10), and a collection cover (14) for collecting foam is provided at the top of the collection cylinder (10). The collection cover (14) is conical. The inlet end of the wastewater outlet pipe (12) extends downward to below the liquid surface. A foam collection pipe (15) is provided on the collection cover (14). The wastewater outlet pipe (12) is connected to the wastewater inlet pipe.

5. The biological treatment device for livestock and poultry wastewater according to claim 1, characterized in that: Each of the first ABR combination tank (1) and the second ABR combination tank (2) is equipped with an overflow plate (16). The overflow plate (16) is located in the ABR tank near the water inlet side and forms an overflow trough with the side wall of the water inlet side. The distance between the overflow plate (16) and the side wall of the water inlet side of the ABR tank is between 110 and 130 mm.

6. The biological treatment device for livestock and poultry wastewater according to claim 5, characterized in that: The height of the overflow plate (16) decreases by 8-12 mm according to the connection sequence of the ABR pool.

7. The biological treatment device for livestock and poultry wastewater according to claim 1, characterized in that: The first aerobic tank (4) consists of two stages connected in series. Both the first aerobic tank (4) and the second aerobic tank (6) are equipped with aeration devices (604).

8. The biological treatment device for livestock and poultry wastewater according to claim 1, characterized in that: The second aerobic tank (6) is equipped with a DC power supply workbench, which is connected to the cathode (601) and anode (602) in the second aerobic tank (6) via wires. The anode (602) is made of iron and / or magnesium, and the cathode (601) is made of stainless steel. There are two or more sets of cathodes (601) and anodes (602), with the cathode (601) and anode being spaced apart. The anode (602) is made of iron or magnesium. The second aerobic tank (6) is equipped with a stirring structure (603). A calcium oxide addition device is installed above the second aerobic tank.

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