An aerobic sludge granulation equipment and its application

Abstract

The present invention belongs to the technical field of sewage biological treatment, and specifically relates to an aerobic sludge granulation equipment and its application. The aerobic sludge granulation equipment includes: a granulation system, which includes a porous polyurethane filler for adsorbing sludge and an air-drying device with adjustable temperature; a screening system, which includes a material carrying device and a centrifugal device located inside the material carrying device. The centrifugal device includes a centrifugal barrel for loading the porous polyurethane filler and a variable-speed motor for driving the centrifugal barrel to rotate. The surface of the centrifugal barrel is provided with screening holes. When the variable-speed motor drives the centrifugal barrel to rotate, the sludge adsorbed on the surface of the porous polyurethane filler is separated; a control and auxiliary system, which includes a control panel and a feeding and discharging system connected to the material carrying device. The device provided by the present invention can be used for rapid granulation of aerobic granular sludge, and has a simple structure and convenient operation steps.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage biological treatment, and particularly relates to an aerobic sludge granulation equipment and its application. Background Art

[0002] Aerobic Granular Sludge (AGS) is granular activated sludge formed by microbial self-aggregation. Compared with traditional flocculent activated sludge, aerobic granular sludge has the following advantages: good sedimentation performance, high sludge concentration, strong shock load resistance, and good treatment effect. It has become a hot spot in sewage biochemical treatment and is one of the most promising wastewater biological treatment technologies at present.

[0003] However, in addition to the instability of granules, the too long granulation time is also one of the problems to be solved urgently in the aerobic granular sludge technology. At present, the main strategies to accelerate the formation of aerobic granular sludge include controlling operating parameters to increase the selection pressure, adding other substances, inoculating granular sludge, and inoculating special microorganisms, etc. Generally, the formation period of aerobic granular sludge is greater than 25 - 35 days, which increases the equipment occupancy, energy consumption, and labor costs to a certain extent. In order to break through this bottleneck, there is an urgent need to propose effective equipment and strategies to ensure rapid granulation and shorten the formation period of AGS. Summary of the Invention

[0004] Aiming at the above technical problems, the present invention provides an aerobic sludge granulation equipment and its application. The structure and control of the aerobic sludge granulation equipment are simple, and it can effectively accelerate the process of aerobic sludge granulation.

[0005] First of all, the present invention provides an aerobic sludge granulation equipment, including:

[0006] A granulation system, the granulation system includes a porous polyurethane filler for adsorbing sludge and an air drying device with adjustable temperature;

[0007] A screening system, the screening system includes a material carrying device and a centrifugal device inside the material carrying device. The centrifugal device includes a centrifugal barrel for loading the porous polyurethane filler and a variable-speed motor for driving the centrifugal barrel to rotate. The surface of the centrifugal barrel is provided with screening holes. When the variable-speed motor drives the centrifugal barrel to rotate, the sludge adsorbed on the surface of the porous polyurethane filler is separated;

[0008] A control and auxiliary system, the control and auxiliary system includes a control panel and a feeding and discharging system connected to the material carrying device.

[0009] The present invention uses the biological filler polyurethane as the granulation carrier. Due to the characteristics of the polyurethane material such as a three-dimensional reticular porous structure and a large specific surface area, it can serve as an ideal biological attachment site and easily cause aerobic sludge to agglomerate on the surface of the porous polyurethane filler. In addition, by setting up an air-drying device, the present invention can promote the microorganisms in the sludge to secrete a large amount of extracellular polymeric substances (EPS). EPS has good biological viscosity and can effectively shorten the process of aerobic sludge granulation.

[0010] Preferably, the diameter of the screening holes is 1-2 mm.

[0011] More preferably, the material carrying device includes a housing and an outer barrel provided between the housing and the centrifugal barrel.

[0012] More preferably, the feeding and discharging system includes a feeding device and a discharging device. The feeding device includes a sludge inlet and a water inlet, and the discharging device includes a sludge discharge port and an aerobic granular sludge collection port. Control valves are provided at the sludge inlet, water inlet, sludge discharge port, and aerobic granular sludge collection port.

[0013] Secondly, the present invention also provides a method for treating aerobic sludge granulation, which is to rapidly granulate aerobic sludge using any one of the above aerobic sludge granulation equipment.

[0014] Preferably, the method for treating aerobic sludge granulation includes the following steps:

[0015] (1) Sludge feeding: Pump the sludge into the material carrying device and rotate the centrifugal barrel at a speed of 60-100 r / min until the sludge adsorbs on the surface of the porous polyurethane filler.

[0016] (2) Granulation: Drain the unadsorbed sludge, start the air-drying device and the centrifugal device for granulation. The heating temperature of the air-drying device is controlled at 30-60 °C, and the rotation speed of the centrifugal barrel in the centrifugal device is 30-60 r / min.

[0017] (3) Separation: Start the centrifugal device to discharge the sludge attached to the surface of the porous polyurethane filler to obtain aerobic granular sludge. The rotation speed of the centrifugal barrel in the centrifugal device is 1000-1500 r / min.

[0018] (4) Flushing: Rinse the porous polyurethane filler, and the internal pores of the porous polyurethane filler and the adhered granular sludge are further rinsed to obtain aerobic granular sludge.

[0019] More preferably, in step (1), the centrifugation time of the centrifugal barrel is 60-120 min.

[0020] As a further preference, the centrifugation time of the centrifuge barrel in step (2) is 180 - 300 min.

[0021] As a further preference, the centrifugation time of the centrifuge barrel in step (3) is 1 - 3 min.

[0022] As a further preference, the water used for rinsing in step (4) can be reclaimed water from a sewage treatment plant.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention proposes to use the biological filler polyurethane as the granulation carrier, which has characteristics such as a reticular three-dimensional porous structure and a large specific surface area, can serve as an ideal biological attachment site, and it is easy for aerobic sludge to agglomerate in the pores and on the surface of the porous polyurethane filler;

[0025] (2) By setting an air-drying device, the present invention can promote a large amount of microorganisms in the sludge to secrete EPS. EPS has good biological viscosity, effectively shortening the sludge granulation process. At the same time, the formed granular or agglomerated sludge can be conveniently separated by centrifugation;

[0026] (3) Traditional granular sludge is formed in a reaction tank, and it is necessary to adjust the parameters of the entire sewage treatment process or add other substances. However, the aerobic sludge granulation equipment of the present invention can use the side stream of sewage treatment and directly granulate the surplus sludge in the thickening tank, without affecting the normal sewage treatment process. Description of the Drawings

[0027] In order to more clearly illustrate the embodiments of the present invention, the following will describe the drawings: Figure 1 It is a schematic diagram of the overall structure of an aerobic sludge granulation equipment for Embodiment 1;

[0028] Figure 2 It is a stereomicroscope image of the mud-water mixed discharge obtained in Embodiment 1;

[0029] Label description: granulation system 1; porous polyurethane filler 11; air-drying device 12; screening system 2; centrifugation device 21; centrifuge barrel 211; variable-speed motor 212; material carrying device 22; outer shell 221; outer barrel 222; control panel 3; feeding device 4; water inlet 41; mud inlet 42; discharging device 5; sludge discharge port 51; aerobic granular sludge collection port 52. Detailed Embodiments

[0030] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are usually only some embodiments of the present invention, rather than all embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] Please refer to Figure 1 , an aerobic sludge granulation equipment of this embodiment includes:

[0033] A granulation system 1, the granulation system 1 includes a porous polyurethane filler 11 for adsorbing sludge and a drying device 12 for adjusting the granulation temperature. Specifically, the drying device 12 can accelerate the air flow and circulation on the surface of the porous polyurethane filler 11, prompting a large amount of EPS to be secreted by the granular sludge attached to the internal pores and adhesions of the porous polyurethane filler 11, so that the sludge dries and agglomerates to form particles.

[0034] A screening system 2, the screening system 2 includes a material carrying device 22, and a centrifugal device 21 for loading the porous polyurethane filler 11 is arranged inside the material carrying device 22. The centrifugal device 21 includes a centrifugal barrel 211 for carrying the porous polyurethane filler 11 and a variable-speed motor 212 for driving the centrifugal barrel 211 to rotate. The side wall and bottom surface of the centrifugal barrel 211 are evenly distributed with screening holes with a diameter of 1 mm. When the variable-speed motor 212 drives the centrifugal barrel 211 to rotate, the sludge adsorbed on the surface of the porous polyurethane filler 11 is separated. The material carrying device 22 includes a housing 221 and an outer barrel 222 arranged between the centrifugal barrel 211 and the housing 221.

[0035] A control and auxiliary system, the control and auxiliary system includes a control panel 3 and a feeding and discharging system connected to the material carrying device 22. The feeding and discharging system includes a feeding device 4 and a discharging device 5. The feeding device 4 includes a sludge inlet 42 and a water inlet 41. The discharging device 5 includes a sludge outlet 51 and an aerobic granular sludge collection port 52. Control valves are provided at the sludge inlet 42, water inlet 41, sludge outlet 51 and aerobic granular sludge collection port 52.

[0036] Using the aerobic sludge granulation equipment of this embodiment to granulate aerobic sludge includes the following steps:

[0037] (1)Sludge feeding: The sludge from the sludge thickening tank of the sewage treatment plant is pumped into the outer barrel 222 until the sludge surface submerges the centrifugal barrel 211. The variable-speed motor 212 is started, and the rotation speed of the centrifugal barrel 211 is maintained at 60 r / min until the sludge adsorbs on the surface of the porous polyurethane filler 11 and the inner pore surface, ensuring that no sludge-water separation occurs in the outer barrel 222. This process lasts for 90 min.

[0038] (2)Pelletizing: The unadsorbed sludge is drained, the air-drying device 12 is started, and the rotation speed of the centrifugal barrel 211 is adjusted to 60 r / min. This process lasts for 240 min, and the heating temperature of the air-drying device 12 is 45°C.

[0039] (3)Separation: After pelletizing, the centrifugal barrel 211 is adjusted to high-speed operation, with a rotation speed of 1200 r / min for 3 min to discharge the sludge attached to the surface of the porous polyurethane filler 11.

[0040] (4)Rinsing: The water inlet 41 is opened to rinse the porous polyurethane filler 11, and the inlet water is the reclaimed water from the sewage treatment plant.

[0041] (5)Collect the sludge-water mixture discharged in steps (3) and (4) to obtain aerobic granular sludge.

[0042] In addition, in this embodiment, the collected sludge-water mixture is also placed under a microscope for observation, and obvious aerobic granular sludge can be observed. For the specific microscope image, please refer to Figure 2 .

[0043] Example 2

[0044] An aerobic sludge granulation equipment in this embodiment includes:

[0045] A granulation system 1, which includes a porous polyurethane filler 11 and an air-drying device 12 for adjusting the granulation temperature.

[0046] A screening system 2, which includes a material carrying device 22. Inside the material carrying device 22, there is a centrifugal device 21 for carrying the porous polyurethane filler 11. The centrifugal device 21 includes a centrifugal barrel 211 for carrying the porous polyurethane filler 11 and a variable-speed motor 212 for driving the centrifugal barrel 211 to rotate. The side wall and bottom surface of the centrifugal barrel 211 are evenly distributed with screening holes with a diameter of 2 mm. When the variable-speed motor 212 drives the centrifugal barrel 211 to rotate, the sludge adsorbed on the surface of the porous polyurethane filler 11 is separated. The material carrying device 22 includes a housing 221 and an outer barrel 222 arranged between the centrifugal barrel 211 and the housing 221.

[0047] Control and auxiliary systems, the control and auxiliary systems include a control panel 3, and a feeding and discharging system connected to the material carrying device 22. The feeding and discharging system includes a feeding device 4 and a discharging device 5. The feeding device 4 includes a sludge inlet 42 and a water inlet 41. The discharging device 5 includes a sludge outlet 51 and an aerobic granular sludge collection port 52. Control valves are provided at the sludge inlet 42, water inlet 41, sludge outlet 51 and aerobic granular sludge collection port 52.

[0048] Using an aerobic sludge granulation equipment of this embodiment to granulate aerobic sludge, the following steps are included:

[0049] (1) Sludge feeding: Pump the sludge from the sludge thickening tank of the sewage treatment plant into the outer barrel 222 until the sludge surface submerges the centrifugal barrel 211. Start the variable-speed motor 212 and keep the rotation speed of the centrifugal barrel 211 at 100 r / min until the sludge adsorbs on the surface of the porous polyurethane filler 11, ensuring that no mud-water separation occurs in the sludge in the outer barrel 222. This process lasts for 60 min.

[0050] (2) Granulation: Drain the unadsorbed sludge, start the air-drying device 12, and adjust the rotation speed of the centrifugal barrel 211 to 30 r / min. This process lasts for 300 min, and the heating temperature of the air-drying device 12 is 60°C.

[0051] (3) Separation: After granulation, adjust the centrifugal barrel 211 to high-speed operation, with a rotation speed of 1000 r / min, for a duration of 2 min to discharge the sludge attached to the surface of the porous polyurethane filler 11.

[0052] (4) Flushing: Open the water inlet 41 to rinse the porous polyurethane filler 11, and the inlet water is the reclaimed water from the sewage treatment plant.

[0053] (5) Collect the mud-water mixed discharge of steps (3) and (4) to obtain aerobic granular sludge.

[0054] Embodiment 3

[0055] An aerobic sludge granulation equipment of this embodiment includes:

[0056] A granulation system 1, the granulation system 1 includes a porous polyurethane filler 11 and an air-drying device 12 for adjusting the granulation temperature.

[0057] Sieving system 2, the sieving system 2 includes a material carrying device 22, inside the material carrying device 22 there is a centrifugal device 21 for carrying porous polyurethane filler 11, the centrifugal device 21 includes a centrifugal barrel 211 for carrying the porous polyurethane filler 11 and a variable-speed motor 212 for driving the centrifugal barrel 211 to rotate. The side wall and bottom surface of the centrifugal barrel 211 are evenly distributed with sieving holes with a diameter of 1.5 mm. When the variable-speed motor 212 drives the centrifugal barrel 211 to rotate, the sludge adsorbed on the surface of the porous polyurethane filler 11 is separated. The material carrying device 22 includes a housing 221 and an outer barrel 222 arranged between the centrifugal barrel 211 and the housing 221.

[0058] Control and auxiliary system, the control and auxiliary system includes a control panel 3 and a feeding and discharging system connected to the material carrying device 22. The feeding and discharging system includes a feeding device 4 and a discharging device 5. The feeding device 4 includes a sludge inlet 42 and a water inlet 41. The discharging device 5 includes a sludge outlet 51 and an aerobic granular sludge collection port 52. Control valves are provided at the sludge inlet 42, water inlet 41, sludge outlet 51 and aerobic granular sludge collection port 52.

[0059] Using an aerobic sludge granulation equipment of this embodiment to granulate sludge includes the following steps:

[0060] (1) Sludge feeding: Pump the sludge from the sludge thickening tank of the sewage treatment plant into the outer barrel 222 until the sludge surface submerges the centrifugal barrel 211. Start the variable-speed motor 212 and keep the rotation speed of the centrifugal barrel 211 at 80 r / min until the sludge is adsorbed on the surface of the porous polyurethane filler 11, ensuring that no mud-water separation occurs in the sludge in the outer barrel 222. This process lasts for 120 min.

[0061] (2) Granulation: Drain the unadsorbed sludge, start the air drying device 12, and adjust the rotation speed of the centrifugal barrel 211 to 50 r / min. This process lasts for 180 min, and the heating temperature of the air drying device 12 is 30°C.

[0062] (3) Separation: After granulation, adjust the centrifugal barrel 211 to high-speed operation, with a rotation speed of 1500 r / min, for a duration of 1 min to discharge the sludge in the internal pores and on the surface of the porous polyurethane filler 11.

[0063] (4) Flushing: Open the water inlet 41 to rinse the porous polyurethane filler 11, and the inlet water is tap water.

[0064] (5) Collect the mud-water mixed discharge of steps (3) and (4) to obtain aerobic granular sludge.

Claims

1. An aerobic sludge granulation equipment, characterized in that, it includes: A granulation system, which includes a porous polyurethane filler for adsorbing sludge and an air-drying device with adjustable temperature; A screening system, which includes a material carrying device and a centrifugal device inside the material carrying device. The centrifugal device includes a centrifugal barrel for loading the porous polyurethane filler and a variable-speed motor for driving the centrifugal barrel to rotate. The surface of the centrifugal barrel is provided with screening holes. When the variable-speed motor drives the centrifugal barrel to rotate, the sludge adsorbed on the surface of the porous polyurethane filler is separated; the material carrying device includes a housing and an outer barrel arranged between the housing and the centrifugal barrel; A control and auxiliary system, which includes a control panel and a feeding and discharging system connected to the material carrying device; The usage method of the aerobic sludge granulation equipment includes the following steps: (1) Feeding sludge: Pump sludge into the outer barrel until the sludge level exceeds the centrifugal barrel, and rotate the centrifugal barrel at a speed of 60-100 r / min until the sludge is adsorbed on the surface of the porous polyurethane filler; (2) Granulation: Drain the unadsorbed sludge, start the air-drying device and the centrifugal device for granulation. The rotation speed of the centrifugal barrel in the centrifugal device is 30-60 r / min; (3) Separation: Start the centrifugal device to discharge the sludge attached to the surface of the porous polyurethane filler to obtain aerobic granular sludge; (4) Flushing: Rinse the porous polyurethane filler, and the internal pores of the porous polyurethane filler and the adhered granular sludge are further rinsed to obtain aerobic granular sludge.

2. The aerobic sludge granulation equipment according to claim 1, characterized in that, The feeding and discharging system includes a feeding device and a discharging device. The feeding device includes a sludge inlet and a water inlet, and the discharging device includes a sludge discharge port and an aerobic granular sludge collection port. Control valves are provided at the sludge inlet, water inlet, sludge discharge port and aerobic granular sludge collection port.

3. An aerobic sludge granulation treatment method, characterized in that, Use the aerobic sludge granulation equipment according to claim 1 or 2 to granulate aerobic sludge.

4. The aerobic sludge granulation treatment method according to claim 3, characterized in that, It includes the following steps: (1) Feeding sludge: Pump sludge into the outer barrel until the sludge level exceeds the centrifugal barrel, and rotate the centrifugal barrel at a speed of 60-100 r / min until the sludge is adsorbed on the surface of the porous polyurethane filler; (2) Granulation: Drain the unadsorbed sludge, start the air-drying device and the centrifugal device for granulation. The heating temperature of the air-drying device is controlled at 30-60 °C, and the rotation speed of the centrifugal barrel in the centrifugal device is 30-60 r / min; (3) Separation: Start the centrifugal device to discharge the sludge attached to the surface of the porous polyurethane filler to obtain aerobic granular sludge. The rotation speed of the centrifugal barrel in the centrifugal device is 1000-1500 r / min; (4) Flushing: Rinse the porous polyurethane filler, and the internal pores of the porous polyurethane filler and the adhered granular sludge are further rinsed to obtain aerobic granular sludge.

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