Device and method for rapidly granulating soft porous biological filler

Abstract

The invention discloses a device and a method for quickly granulating soft porous biological filler. The device comprises a mechanical lifting crane, a lifting rope, a driving motor, a device fixing plate, a filler mounting fixing plate, a soft porous biological filler, a filler mounting movable plate and a driving screw rod. According to the invention, the three-dimensional network structure of the soft porous biological filler is utilized to quickly form a biological membrane; further, the moisture content of the biological membrane is reduced through natural drying, and the mutual cohesion strength and compactness of microorganisms are improved; according to the rapid granulation device, the soft and variable characteristics of the soft porous filler are utilized to automatically extrude, fall off and dry the biological membrane, so that the rapid granulation of the active floc sludge is realized, the improvement of the sludge settling performance is promoted, and a foundation is laid for the rapid formation of the aerobic granular sludge.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a device and method for rapid granulation of soft porous biological fillers. Background Art

[0002] Aerobic granular sludge is a new type of sewage biological treatment technology that has received extensive attention and research in recent years. Compared with traditional activated floc sludge, aerobic granular sludge has the advantages of good settling performance, compact structure and high biomass. Although there are cases of aerobic granular sludge engineering application, the long formation time of aerobic granular sludge and the difficulty in long-term stable operation are still the main challenges faced by this technology in practical application.

[0003] It is difficult for activated floc sludge to quickly form sludge aggregates in the early stage of aerobic sludge granulation, especially in the continuous flow process, which is the main reason for the long formation time of aerobic granular sludge. Current research mainly focuses on the addition of metal cations, flocculants, activated carbon particles, etc. to accelerate the formation of sludge aggregates in the early stage of aerobic granulation, thereby shortening the start-up time of aerobic granular sludge. However, the addition of nucleating agents to promote the rapid formation of sludge aggregates will not only increase the cost of sludge treatment, but may also cause secondary pollution. In addition, the existing disclosed invention patents involve a method for rapidly cultivating aerobic granular sludge and enhancing denitrification. In a sequencing batch reactor, polyurethane sponge fillers are used to couple sludge drying, and the method of periodic large bubble aeration is used to cause the biofilm to fall off to promote the formation of aerobic granular sludge. The method involved in this invention patent is only for laboratory sequencing batch reactors, and the method of periodic large bubble aeration to cause the biofilm to fall off is inefficient, energy-intensive, and difficult to apply in actual engineering. Based on this, the present invention proposes a rapid granulation device and method that can be applied to practical projects, adapt to various biological treatment processes, and can automatically and efficiently remove and dry biofilm, promote the improvement of sludge settling performance, and lay the foundation for the rapid formation of aerobic granular sludge. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for rapid granulation of soft porous biological fillers. The device and method can be applied to practical projects, adapt to various biological treatment processes, and can automatically and efficiently shed and dry biofilms, achieve rapid granulation of active flocculent sludge, promote the improvement of sludge settling performance, and lay the foundation for the rapid formation of aerobic granular sludge.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for rapid granulation of soft porous biological fillers comprises a mechanical lifting crane (1), a lifting rope (2), a driving motor (3), a device fixing plate (4), a filler mounting fixing plate (5), a soft porous biological filler (6), a filler mounting movable plate (7), and a driving screw (8); the mechanical lifting crane (1) can be lifted up and down by the lifting rope (2); the lifting rope (2) is fixedly connected to the device fixing plate (4); the device fixing plate (4) is fixedly connected to the filler mounting fixing plate (5); the driving motor (3) is placed on the device fixing plate (4) and is fixedly connected to the upper end of the driving screw (8); the lower end of the driving screw (8) is connected to the filler mounting movable plate (7) by a thread; the driving motor (3) rotates the driving screw (8) to enable the filler mounting movable plate (7) to move up and down; one end of the soft porous biological filler (6) is fixed to the filler mounting fixing plate (5); and the other end is fixed to the filler mounting movable plate (7).

[0007] Preferably, the soft porous biological filler (6) is a polyurethane sponge filler.

[0008] Preferably, the soft porous biological filler (6) has a thickness of 1-3 cm and a pore density of 15-35 ppi.

[0009] The present invention also provides a method for rapid granulation using the above device, comprising the following steps:

[0010] Step 1): placing the rapid granulation device in a biological pool containing activated sludge, and allowing the soft porous biological filler (6) to be completely immersed in the activated sludge to form biofilm for a period of time;

[0011] Step 2): lifting the lifting rope (2) by means of a mechanical lifting crane (1) to remove the soft porous biological filler (6) from the activated sludge and completely expose it to the air for natural drying;

[0012] Step 3): After natural drying is completed, the driving motor (3) is used to rotate the driving screw (8), so that the filler mounting movable plate (7) is gradually moved upward to squeeze the soft porous biological filler (6), so that the dried biofilm is forced to be squeezed off and sludge aggregates are quickly obtained.

[0013] Preferably, the method further comprises step 4): after the biofilm is forced to fall off by squeezing, the rapid granulation device can repeat steps 1) to 3) to continuously obtain sludge aggregates.

[0014] Preferably, a plurality of the rapid granulation devices are placed in the activated sludge biological pool, so that the dosage of the soft porous biological filler (6) is 0.2-0.8 g biological filler / g activated sludge; and the biofilm formation time of the biological filler is 7-20 days.

[0015] Preferably, the natural drying time in the air in step 2) is 12-48 hours.

[0016] Preferably, the average particle size of the sludge aggregates obtained after automatic squeezing and falling off in step 3) is 150-250 μm, and the SVI is 40-80 mL / g.

[0017] Preferably, in step 4), according to the changes in the average particle size and sludge volume index (SVI) of the biochemical pool sludge, steps 1) to 3) can be continuously repeated until the SVI of the biochemical pool sludge drops below 80 mL / g, or the biochemical pool sludge achieves aerobic granulation.

[0018] Technical effects of the present invention:

[0019] The present invention utilizes the three-dimensional network structure of soft porous biological filler to quickly intercept and adhere to active floc sludge, promote the rapid formation of biofilm, further reduce the water content of biofilm and increase the extracellular polymer content of biofilm by long-term natural drying, and improve the strength and density of mutual adhesion of sludge microorganisms; the rapid granulation device utilizes the soft and variable characteristics of soft porous filler, and realizes the automatic extrusion and shedding of naturally dried biofilm through the linkage of driving motor, driving screw, filler mounting fixed plate and filler mounting movable plate, so as to form sludge aggregates with large particle size and good sedimentation performance, improve the sludge sedimentation performance, and lay the foundation for the rapid formation of aerobic granular sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : A device for rapid granulation of soft porous biological fillers.

[0021] Figure 2 : Activated floc sludge (A) of a biochemical pool and sludge aggregates (B) prepared using the device and method of the present invention.

[0022] Figure numerals: 1. Mechanical lifting crane, 2. Lifting rope, 3. Driving electrode, 4. Device fixing plate, 5. Filler installation fixing plate, 6. Soft porous biological filler, 7. Filler installation movable plate, 8. Driving screw. DETAILED DESCRIPTION

[0023] The present invention is further described below by means of specific embodiments, but the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0024] The structure of the device for rapid granulation of soft porous biological filler of the present invention is as follows: Figure 1As shown, the device includes a mechanical lifting crane 1, a lifting rope 2, a driving motor 3, a device fixing plate 4, a filler installation fixing plate 5, a soft porous biological filler 6, a filler installation movable plate 7, and a driving screw 8; the mechanical lifting crane 1 can be lifted up and down by the lifting rope 2, the lifting rope 2 is fixedly connected to the device fixing plate 4, the device fixing plate 4 is fixedly connected to the filler installation fixing plate 5, the driving motor 3 is placed on the device fixing plate 4 and is fixedly connected to the upper end of the driving screw 8, the lower end of the driving screw 8 is connected to the filler installation movable plate 7 by a thread, the driving motor 3 rotates the driving screw 8 to make the filler installation movable plate 7 move up and down, one end of the soft porous biological filler 6 is fixed on the filler installation fixing plate 5, and the other end is fixed on the filler installation movable plate 7.

[0025] The soft porous biological filler 6 used in the specific embodiment of the present invention is a polyurethane sponge filler with a thickness of 1-3 cm and a pore density of 15-35 ppi.

[0026] Example 1

[0027] A method for rapid granulation of soft porous biological fillers.

[0028] Select polyurethane sponge filler with a thickness of 1 cm and a pore density of 35 ppi.

[0029] The steps include:

[0030] Step 1): placing a rapid granulation device in a biological pool with activated sludge, and completely immersing the soft porous biological filler 6 in the activated sludge, the average particle size of the activated sludge is 45 μm, the SVI is 135 mL / g, the dosage of the soft porous filler 6 is 0.6 g of biological filler / g of activated sludge, and the biofilm formation time of the biological filler is 10 days;

[0031] Step 2): The device is removed from the activated sludge by means of a mechanical lifting crane 1 and a lifting rope 2, and the soft porous biological filler 6 is completely exposed to the air to dry naturally for 24 hours;

[0032] Step 3): After the biofilm filler is naturally dried, the screw 8 is rotated by the driving motor 1 to gradually move the filler mounting movable plate 7 upward to squeeze the soft porous biological filler 6, so that the dried biofilm is forced to be squeezed off, and the average particle size of the obtained sludge aggregate is 220μm and the SVI is 55mL / g.

[0033] Step 4): After the biofilm was forced to fall off by squeezing, the rapid granulation device repeated steps 1) to 3) 4 times, and the SVI of the biochemical pond sludge dropped to 70 mL / g.

[0034] Figure 2 It is a comparison diagram of the activated floc sludge in the biochemical pond and the sludge aggregates prepared in this example.

[0035] Example 2

[0036] A method for rapid granulation of soft porous biological fillers.

[0037] Select polyurethane sponge filler with a thickness of 3 cm and a pore density of 25 ppi.

[0038] The steps include:

[0039] Step 1): placing a rapid granulation device in a biological pool with activated sludge, and completely immersing the soft porous biological filler 6 in the activated sludge, the average particle size of the activated sludge is 45 μm, the SVI is 135 mL / g, the dosage of the soft porous filler 6 is 0.4 g of biological filler / g of activated sludge, and the biofilm formation time of the biological filler is 15 days;

[0040] Step 2): The device is removed from the activated sludge by means of a mechanical lifting crane 1 and a lifting rope 2, and the soft porous biological filler 6 is completely exposed to the air to dry naturally for 36 hours;

[0041] Step 3): After the biofilm filler is naturally dried, the screw 8 is rotated by the driving motor 1 to gradually move the filler mounting movable plate 7 upward to squeeze the soft porous biological filler 6, so that the dried biofilm is forced to be squeezed off, and the average particle size of the obtained sludge aggregate is 235μm and the SVI is 45mL / g.

[0042] Step 4): After the biofilm was forced to fall off by squeezing, the rapid granulation device repeated steps 1) to 3) 6 times, and the SVI of the biochemical pool sludge dropped to 70 mL / g.

[0043] Example 3

[0044] A method for rapid granulation of soft porous biological fillers.

[0045] Select polyurethane sponge filler with a thickness of 2 cm and a pore density of 25 ppi.

[0046] The steps include:

[0047] Step 1): placing a rapid granulation device in a biological pool with activated sludge, and completely immersing the soft porous biological filler 6 in the activated sludge, the average particle size of the activated sludge is 45 μm, the SVI is 135 mL / g, the dosage of the soft porous filler 6 is 0.8 g of biological filler / g of activated sludge, and the biofilm formation time of the biological filler is 15 days;

[0048] Step 2): The device is taken out from the activated sludge by means of a mechanical lifting crane 1 and a lifting rope 2, and the soft porous biological filler 6 is completely exposed to the air to dry naturally for 30 hours;

[0049] Step 3): After the biofilm filler is naturally dried, the screw 8 is rotated by the driving motor 1 to gradually move the filler mounting movable plate 7 upward to squeeze the soft porous biological filler 6, so that the dried biofilm is forced to be squeezed off, and the average particle size of the obtained sludge aggregate is 230μm and the SVI is 50mL / g.

[0050] Step 4): After the biofilm was forced to fall off by squeezing, the rapid granulation device repeated steps 1) to 3) 4 times, and the SVI of the biochemical pond sludge dropped to 65 mL / g.

[0051] Example 4

[0052] A method for rapid granulation of soft porous biological fillers.

[0053] Select polyurethane sponge filler with a thickness of 3 cm and a pore density of 15 ppi.

[0054] The steps include:

[0055] Step 1): placing a rapid granulation device in a biological pool with activated sludge, and completely immersing the soft porous biological filler 6 in the activated sludge, the average particle size of the activated sludge is 45 μm, the SVI is 135 mL / g, the dosage of the soft porous filler 6 is 0.2 g of biological filler / g of activated sludge, and the biofilm formation time of the biological filler is 18 days;

[0056] Step 2): The device is removed from the activated sludge by means of a mechanical lifting crane 1 and a lifting rope 2, and the soft porous biological filler 6 is completely exposed to the air to dry naturally for 18 hours;

[0057] Step 3): After the biofilm filler is naturally dried, the screw 8 is rotated by the driving motor 1 to gradually move the filler mounting movable plate 7 upward to squeeze the soft porous biological filler 6, so that the dried biofilm is forced to be squeezed off, and the average particle size of the obtained sludge aggregate is 190μm and the SVI is 65mL / g.

[0058] Step 4): After the biofilm was forced to fall off by squeezing, the rapid granulation device repeated steps 1) to 3) for 6 times, and the SVI of the biochemical pool sludge dropped to 80 mL / g.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for rapid granulation of soft porous biological fillers, characterized in that: The invention comprises a mechanical lifting crane (1), a lifting rope (2), a driving motor (3), a device fixing plate (4), a filler mounting fixing plate (5), a soft porous biological filler (6), a filler mounting movable plate (7), and a driving screw (8); the mechanical lifting crane (1) can be lifted up and down by the lifting rope (2); the lifting rope (2) is fixedly connected to the device fixing plate (4); the device fixing plate (4) is fixedly connected to the filler mounting fixing plate (5); the driving motor (3) is placed on the device fixing plate (4) and is fixedly connected to the upper end of the driving screw (8); the lower end of the driving screw (8) is connected to the filler mounting movable plate (7) by a thread; the driving motor (3) rotates the driving screw (8) to enable the filler mounting movable plate (7) to move up and down; one end of the soft porous biological filler (6) is fixed to the filler mounting fixing plate (5); and the other end is fixed to the filler mounting movable plate (7).

2. The device for rapid granulation of soft porous biological fillers according to claim 1, characterized in that: The soft porous biological filler (6) is a polyurethane sponge filler.

3. The device for rapid granulation of soft porous biological fillers according to claim 1, characterized in that: The soft porous biological filler (6) has a thickness of 1-3 cm and a pore density of 15-35 ppi.

4. A method for rapid granulation using the device according to any one of claims 1 to 3, characterized in that: The steps include: Step 1): placing the rapid granulation device in a biological pool containing activated sludge, and allowing the soft porous biological filler (6) to be completely immersed in the activated sludge to form biofilm for a period of time; Step 2): lifting the lifting rope (2) by means of a mechanical lifting crane (1) to remove the soft porous biological filler (6) from the activated sludge and completely expose it to the air for natural drying; Step 3): After natural drying is completed, the driving motor (3) is used to rotate the driving screw (8), so that the filler mounting movable plate (7) is gradually moved upward to squeeze the soft porous biological filler (6), so that the dried biofilm is forced to be squeezed off and sludge aggregates are quickly obtained.

5. The method according to claim 4, characterized in that The step 4 is also included: after the biofilm is forced to be squeezed off, the rapid granulation device can repeat the steps 1) to 3) to continuously obtain sludge aggregates.

6. The method according to claim 4, characterized in that A plurality of the rapid granulation devices are placed in the activated sludge biological pool, so that the dosage of the soft porous biological filler (6) is 0.2-0.8g biological filler / g activated sludge; the biofilm formation time of the biological filler is 7-20 days.

7. The method according to claim 4, characterized in that The time for natural drying in the air in step 2) is 12-48 hours.

8. The method according to claim 4, characterized in that The average particle size of the sludge aggregates obtained after automatic squeezing and falling off in step 3) is 150-250 μm, and the SVI is 40-80 mL / g.

9. The method according to claim 4, characterized in that In the step 4), according to the changes in the average particle size and sludge volume index (SVI) of the biochemical pool sludge, steps 1) to 3) can be continuously repeated until the SVI of the biochemical pool sludge drops below 80 mL / g, or the biochemical pool sludge achieves aerobic granulation.

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