Self-circulation type continuous-flow aerobic granular sludge sewage treatment facility

Abstract

The present application relates to sewage treatment technical field, specifically said is a kind of self-circulation type continuous flow aerobic granular sludge sewage treatment facilities, including treatment pond, the water inlet pipe and sludge discharge pipe are equipped on one side of the treatment pond, the other side of treatment pond is equipped with water outlet pipe, the vertical baffle A of sequentially arranged and having interval, vertical baffle B and vertical baffle C are equipped in the inside of treatment pond from water inlet direction to water outlet direction, the top and bottom of vertical baffle A vertical baffle B are kept interval with the top and bottom of treatment pond, the bottom of vertical baffle C is kept interval with the bottom of treatment pond, the top of vertical baffle C is higher than the top of treatment pond;The flow state of ascending reaction zone and descending reaction zone of the present application can create suitable hydraulic shear force conditions for aerobic granular sludge formation, accelerate granular shaping, these conditions can accelerate sludge granulation, realize aerobic granular sludge rapid cultivation.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a self-circulating continuous flow aerobic granular sludge wastewater treatment facility. Background Technology

[0002] Aerobic granular sludge (AGS) is a special form of biofilm. Compared with traditional activated sludge (CAS) technology, it has advantages such as high solids concentration, good settling performance, and low sludge volume, and has significant advantages in terms of operating costs, power consumption, and land area. Aerobic granular sludge contains an oxygen concentration gradient, with aerobic, anoxic, and anaerobic zones from the outside in. This structural feature creates favorable conditions for various functional microorganisms to synergistically remove carbon, nitrogen, and phosphorus from wastewater. Aerobic granular sludge technology is predicted to be a promising wastewater treatment technology.

[0003] Most successful cases of aerobic granular sludge technology in laboratory or large-scale applications employ sequencing batch reactors with a large aspect ratio. However, existing wastewater treatment processes are dominated by continuous flow. In the promotion and application of aerobic granular sludge technology based on sequencing batch reactors, there may be problems such as difficulty in integrating with existing processes and incompatibility of process parameters.

[0004] Therefore, a self-circulating continuous flow aerobic granular sludge wastewater treatment facility is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a self-circulating continuous flow aerobic granular sludge wastewater treatment facility to solve the above-mentioned problems. This facility achieves the cultivation of aerobic granular sludge under continuous flow conditions by optimizing hydraulic conditions and selecting sedimentation rates, thereby achieving the purpose of purifying water quality.

[0006] The present invention achieves the above-mentioned objective through the following technical solution: a self-circulating continuous flow aerobic granular sludge wastewater treatment facility, comprising a treatment tank, an inlet pipe and a sludge discharge pipe on one side of the treatment tank, and a drain pipe on the other side of the treatment tank. Inside the treatment tank, from the inlet direction to the outlet direction, are arranged vertical partitions A, B, and C with spacing between them. The top and bottom of vertical partitions A and B maintain a distance from the top and bottom of the treatment tank, and the bottom of vertical partition C maintains a distance from the bottom of the treatment tank. The top of vertical partition C is higher than the top of the treatment tank. The vertical partitions A, B, and C divide the interior of the treatment tank from the inlet direction to the outlet direction into an ascending reaction zone, a descending reaction zone left chamber, a descending reaction zone right chamber, and a sedimentation and drainage zone. An aeration device is provided at the bottom of the ascending reaction zone. The inlet pipe and sludge discharge pipe are located at the bottom of one side of the treatment tank and communicate with the ascending reaction zone. The drain pipe is located at the top of the other side of the treatment tank and communicates with the sedimentation and drainage zone.

[0007] The present invention is further configured such that a sliding mud bottom plate is provided below the rising reaction zone, the left chamber of the falling reaction zone, the right chamber of the falling reaction zone, and the sedimentation and drainage zone, and the sliding mud bottom plate maintains a distance from the vertical partition A, the vertical partition B, and the vertical partition C.

[0008] The present invention is further configured such that the mud-sliding bottom plate is inclined, with its lowest end below the rising reaction zone and its highest end below the sedimentation and drainage zone.

[0009] In a preferred embodiment of the present invention, the inclination angle of the mud-sliding bottom plate is 10° to 60°, and the inclination of the mud-sliding bottom plate can accelerate the return speed of the sludge.

[0010] The present invention is further configured such that the distance between the mud-sliding bottom plate and the vertical partition A, vertical partition B and vertical partition C is consistent.

[0011] The present invention is further configured such that the cross-sectional area ratio of the rising reaction zone, the left chamber of the falling reaction zone, the right chamber of the falling reaction zone, and the sedimentation and drainage zone is (1-4):(1-4):(1-2):1.

[0012] The present invention is preferably configured such that the cross-sectional area ratio of the rising reaction zone, the left chamber of the falling reaction zone, the right chamber of the falling reaction zone, and the sedimentation and drainage zone is 2:2:1:1.

[0013] The invention is further configured such that the vertical partitions A, B, and C are all installed on the treatment tank via suspension components. The suspension components include sliding grooves formed on both sides inside the treatment tank and corresponding to the vertical partitions A, B, and C respectively. Both sides of the vertical partitions A, B, and C are located within their respective sliding grooves. Tie rods are fixed to the top sides of the vertical partitions A, B, and C, and these tie rods are also located within their respective sliding grooves. A U-shaped suspension rod is fixed to the top of each tie rod. The U-shaped suspension rod is movably inserted into the side wall of the treatment tank and is fixed to the treatment tank via pins. Several pin holes are provided from top to bottom on the outer wall of the treatment tank corresponding to the suspension rods.

[0014] The present invention is further configured such that the thickness of the vertical partition A, vertical partition B, vertical partition C and the tie rod matches the width of the groove.

[0015] The beneficial effects of this invention are:

[0016] 1. The flow patterns in the rising and falling reaction zones can create suitable hydraulic shear conditions for the formation of aerobic granular sludge, accelerating particle shaping. These conditions can accelerate sludge granulation and achieve rapid cultivation of aerobic granular sludge.

[0017] 2. The hydraulic conditions in the left and right chambers of the descending reaction zone help maintain the stability of mature aerobic granular sludge and accelerate the granulation of flocculent sludge, thereby improving the degree of granulation.

[0018] 3. This invention avoids the damage to aerobic granular sludge caused by the use of reflux equipment such as vane pumps, thus promoting the stability of aerobic granular sludge. The integrated design of biochemical reaction and solid-liquid separation saves land and engineering costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention in the form of a suspension component-free state;

[0020] Figure 2 This is a schematic diagram of the structure of the present invention with a suspension component;

[0021] Figure 3 This is a front view sectional view of the present invention;

[0022] Figure 4 This is an enlarged structural diagram of the suspension component in this invention;

[0023] Figure 5 In this invention Figure 1 Enlarged structural diagram at point A in the middle;

[0024] Figure 6 This is a schematic diagram of the wastewater purification process structure of the present invention.

[0025] In the diagram: 1. Rising reaction zone; 2. Left chamber of descending reaction zone; 3. Right chamber of descending reaction zone; 4. Sedimentation and drainage zone; 5. Vertical partition A; 6. Vertical partition B; 7. Vertical partition C; 8. Sludge sliding bottom plate; 9. Inlet pipe; 10. Sludge discharge pipe; 11. Aeration device; 12. Outlet pipe; 13. Treatment tank; 14. Suspension component; 140. Slide chute; 141. Suspension rod; 142. Tie rod; 143. Pin. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-6A self-circulating continuous flow aerobic granular sludge wastewater treatment facility includes a treatment tank 13. An inlet pipe 9 for introducing wastewater into the treatment tank 13 and a sludge discharge pipe 10 for discharging sludge settled in the treatment tank 13 are located at the bottom of one side of the treatment tank 13. A drain pipe 12 for discharging liquid from the separated sludge is located at the top of the other side of the treatment tank 13. Vertical baffles A5, B6, and C7 are arranged sequentially and spaced apart from the inlet direction to the outlet direction inside the treatment tank 13. The top and bottom of vertical baffles B6 are spaced apart from the top and bottom of the treatment tank 13. The bottom of vertical baffle C7... The vertical partition C7 is positioned at a distance from the bottom of the treatment tank 13. The top of the vertical partition C7 is higher than the top of the treatment tank 13. The vertical partitions A5, B6 and C7 divide the interior of the treatment tank 13 into an ascending reaction zone 1, a descending reaction zone left chamber 2, a descending reaction zone right chamber 3 and a sedimentation and drainage zone 4 from the water inlet direction to the water outlet direction. An aeration device 11 is provided at the bottom of the ascending reaction zone 1 (the aeration device 11 is prior art and will not be described in detail in this case). The water inlet pipe 9 and the sludge discharge pipe 10 are located at the bottom of one side of the treatment tank 13 and are connected to the ascending reaction zone 1. The drain pipe 12 is located at the top of the other side of the treatment tank 13 and is connected to the sedimentation and drainage zone 4.

[0028] Wastewater enters the rising reaction zone 1 through the inlet pipe 9. The aeration device 11 provides oxygen and hydraulic circulation power for the biological reaction, achieving thorough mixing of the gas, liquid, and solid phases. The resulting mixed liquid overflows from the top of the vertical baffle A5 into the left chamber 2 of the falling reaction zone. The mixed liquid flows horizontally at a certain speed in the upper layer of the left chamber 2 of the falling reaction zone. The difference in settling performance causes granular sludge with different particle sizes and densities to enter the left chamber 2 and the right chamber 3 of the falling reaction zone, respectively. The mixed liquid entering the right chamber 3 of the falling reaction zone splits at its bottom. Part of the mixed liquid enters the sedimentation and drainage zone 4 for sludge-water separation. The treated water is discharged from the outlet pipe 12, and the settled sludge flows back along the sliding mud bottom plate 8 under the action of gravity. The other part of the mixed liquid, together with the returned sludge, enters the bottom of the left chamber 2 of the falling reaction zone along the sliding mud bottom plate 8. The difference in gas content between the rising reaction zone 1 and the left chamber 2 of the falling reaction zone causes the density of the mixed liquid in the left chamber 2 of the falling reaction zone to be greater than that in the rising reaction zone, causing the mixed liquid to flow back to the rising reaction zone 1, forming a self-circulating continuous flow operation.

[0029] In this embodiment, the total effective volume of the pool is 12L, and the length × width × height is 300 × 100 × 600mm. The cross-sectional area ratio of the rising reaction zone 1, the left chamber of the descending reaction zone 2, the right chamber of the descending reaction zone 3, and the sedimentation and drainage zone 4 is 2:2:1:1. The inclination angle of the mud-sliding bottom plate 8 is 60°, and the total hydraulic retention time is 6 hours.

[0030] The remaining activated sludge is added to the device as inoculum sludge, and the initial sludge concentration is controlled at about 10,000 mg / L. The wastewater enters the rising reaction zone 1 through the inlet pipe 9 and is fully mixed with the return mixed liquor. The dissolved oxygen in the rising reaction zone 1 is above 3.5 mg / L.

[0031] The mixed liquor overflows from the top of the vertical baffle A5 into the left chamber 2 of the descending reaction zone. The mixed liquor flows horizontally in the upper layer of the left chamber 2 of the descending reaction zone. Granular sludge with good settling performance enters the left chamber 2 of the descending reaction zone, while granular sludge with slightly poorer settling performance enters the right chamber 3 of the descending reaction zone. The different hydraulic conditions in the left and right chambers help maintain the stability of aerobic granular sludge and accelerate the granulation of flocculent sludge, improving the degree of granulation. The mixed liquor entering the right chamber 3 of the descending reaction zone splits at its bottom. Part of the mixed liquor enters the sedimentation and drainage zone 4 for sludge-water separation. The treated water is discharged from the outlet pipe 12, and the settled sludge flows back along the sliding mud bottom plate 8 under the action of gravity. The other part of the mixed liquor, together with the returned sludge, enters the bottom of the left chamber 2 of the descending reaction zone along the sliding mud bottom plate 8. The difference in gas content between the rising reaction zone 1 and the left chamber 2 of the descending reaction zone causes the density of the mixed liquor in the left chamber 2 of the descending reaction zone to be greater than that in the rising reaction zone 1, prompting the mixed liquor to flow back to the rising reaction zone 1, forming a self-circulating continuous flow operation.

[0032] Since the amount of sludge is not fixed, when the amount of sludge is too high, the flow rate of the sludge from the sedimentation drainage zone 4 to the rising reaction zone 1 will be slow or blocked. Therefore, it is necessary to change the distance between the vertical baffles A5, B6 and C7 and the sludge bottom plate 8. This can be done by inserting and pulling the pins 143 on the suspension rod 141 to adjust the rise and fall of the vertical baffles A5, B6 and C7. After the vertical baffles A5, B6 and C7 rise, the distance between them and the sludge bottom plate 8 increases, which can accelerate the flow rate of the sludge.

[0033] The technical features of the above-mentioned technical solution are as follows:

[0034] The difference in upward flow velocity between the rising reaction zone and the downward flow velocity between the falling reaction zone results in different hydraulic characteristics. There is a certain density difference between the mixed liquor in the rising reaction zone and the mixed liquor in the falling reaction zone. The flow rate of the mixed liquor in the falling reaction zone returning to the rising reaction zone is several to tens of times the influent flow rate, which increases the upward flow velocity, enhances the shear force of the water flow, and promotes mixing, mass transfer, and aerobic granular sludge shaping.

[0035] 2. Aerobic granular sludge with different settling properties are screened by vertical baffles and then enter the left and right chambers of the descending reaction zone respectively. The hydraulic parameters such as process flow, flow rate, hydraulic retention time, and hydraulic gradient are different.

[0036] 3. The design integrates biochemical reaction and solid-liquid separation, allowing aerobic granular sludge to circulate within the tank without the need for an additional reflux device.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A self-circulating continuous flow aerobic granular sludge wastewater treatment facility, comprising a treatment tank (13), wherein an inlet pipe (9) and a sludge discharge pipe (10) are provided on one side of the treatment tank (13), and a drain pipe (12) is provided on the other side of the treatment tank (13), characterized in that: The treatment tank (13) is equipped with vertical partitions A (5), B (6), and C (7) arranged sequentially and spaced apart from the inlet to the outlet direction. The top and bottom of vertical partitions B (6) of vertical partition A (5) are spaced apart from the top and bottom of the treatment tank (13), and the bottom of vertical partition C (7) is spaced apart from the bottom of the treatment tank (13). The top of vertical partition C (7) is higher than the top of the treatment tank (13). The vertical partitions A (5), B (6), and C (7) are arranged sequentially and spaced apart from the outlet direction. The vertical partition C (7) divides the interior of the treatment tank (13) into an upward reaction zone (1), a downward reaction zone left chamber (2), a downward reaction zone right chamber (3), and a sedimentation and drainage zone (4) from the water inlet direction to the water outlet direction. An aeration device (11) is provided at the bottom of the upward reaction zone (1). The water inlet pipe (9) and the sludge discharge pipe (10) are located at the bottom of one side of the treatment tank (13) and are connected to the upward reaction zone (1). The drain pipe (12) is located at the top of the other side of the treatment tank (13) and is connected to the sedimentation and drainage zone (4). The mixed liquor flows horizontally at a certain speed in the upper layer of the left chamber of the descending reaction zone. The difference in settling performance causes granular sludge with different particle sizes and densities to enter the left and right chambers of the descending reaction zone, respectively.

2. The self-circulating continuous flow aerobic granular sludge wastewater treatment facility according to claim 1, characterized in that: The rising reaction zone (1), the left chamber of the falling reaction zone (2), the right chamber of the falling reaction zone (3), and the sedimentation and drainage zone (4) are all provided with a mud-sliding bottom plate (8), which maintains a distance from the vertical partition A (5), the vertical partition B (6), and the vertical partition C (7).

3. The self-circulating continuous flow aerobic granular sludge wastewater treatment facility according to claim 2, characterized in that: The mud-sliding bottom plate (8) is inclined, with its lowest end below the rising reaction zone (1) and its highest end below the sedimentation and drainage zone (4).

4. The self-circulating continuous flow aerobic granular sludge wastewater treatment facility according to claim 3, characterized in that: The inclination angle of the mud-slippery base plate (8) is 10° to 60°.

5. The self-circulating continuous flow aerobic granular sludge wastewater treatment facility according to claim 2, characterized in that: The distance between the mud-slipping bottom plate (8) and the vertical partitions A (5), B (6) and C (7) is consistent.

6. The self-circulating continuous flow aerobic granular sludge wastewater treatment facility according to claim 1, characterized in that: The cross-sectional area ratio of the rising reaction zone (1), the left chamber of the falling reaction zone (2), the right chamber of the falling reaction zone (3), and the sedimentation and drainage zone (4) is (1~4):(1~4):(1~2):

1.

7. The self-circulating continuous flow aerobic granular sludge wastewater treatment facility according to claim 1, characterized in that: The vertical partitions A (5), B (6), and C (7) are all installed on the treatment tank (13) via suspension members (14). The suspension members (14) include sliding grooves (140) formed on both sides inside the treatment tank (13) and corresponding to the vertical partitions A (5), B (6), and C (7) respectively. Both sides of the vertical partitions A (5), B (6), and C (7) are located within the corresponding sliding grooves (140). Pull rods (142) are fixed on both sides of the top of the partition B (6) and the vertical partition C (7). The pull rods (142) are also located in the corresponding grooves (140). A U-shaped suspension rod (141) is fixed on the top of each pull rod (142). The U-shaped suspension rod (141) is movably inserted into the side wall of the treatment tank (13). The suspension rod (141) is fixed to the treatment tank (13) by a pin (143). Several pin holes are provided from top to bottom on the outer wall of the treatment tank (13) corresponding to the suspension rod (141).

8. The self-circulating continuous flow aerobic granular sludge wastewater treatment facility according to claim 7, characterized in that: The thickness of the vertical partition A (5), vertical partition B (6), vertical partition C (7) and the tie rod (142) matches the width of the groove (140).

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