Sewage carbon and phosphorus trapping device

Abstract

The utility model discloses a sewage carbon and phosphorus trapping device which comprises a carbon and phosphorus trapping area and a phosphorus desorption area which are separated by a baffle, a liftable rotating shaft is arranged in the baffle and is connected with a plurality of fixed rods positioned above the carbon and phosphorus trapping area and the phosphorus desorption area, and fillers are hung on the fixed rods. According to the sewage carbon and phosphorus trapping device disclosed by the utility model, the corresponding relationship between the fixed rod and the filler on the fixed rod and the carbon and phosphorus trapping region and the phosphorus desorption region can be changed through the rotation of the rotating shaft, and the filler can leave or enter the corresponding carbon and phosphorus trapping region and phosphorus desorption region through the lifting of the rotating shaft. The sewage carbon and phosphorus trapping device disclosed by the utility model is compact in design, space-saving and capable of effectively realizing removal and trapping of carbon and phosphorus in sewage.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage carbon and phosphorus capture device. Background Art

[0002] With the development of society, a large amount of sewage to be treated has been generated. Traditional activated sludge treatment technology oxidizes organic matter into CO2 through strong aeration and transfers phosphorus in sewage to sludge through biological phosphorus removal process, thereby achieving carbon and phosphorus removal and water purification.

[0003] Phosphorus is an important resource required for agriculture, and the capture and recovery of carbon and phosphorus from sewage is of great significance. In addition to biological phosphorus removal through phosphorus-accumulating microorganisms in activated sludge, more efficient phosphorus removal can also be achieved through adsorption by adsorbents.

[0004] The general adsorption phosphorus removal is to add adsorbents into the bioreactor to reduce the phosphorus concentration of the effluent to meet the sewage discharge standard. However, the disadvantage of this method is that the adsorbent consumption is large and the adsorbent is discharged with the sludge, making it difficult to recycle.

[0005] By fixing the adsorbent on the artificial synthetic fiber filler and performing alternating cycles of adsorption and desorption in the same device, the adsorbent can be recycled. This not only makes the effluent phosphorus concentration meet the standard, but also achieves phosphorus enrichment and recovery at the same time, saving time and space.

[0006] Biochar has a loose porous structure, a huge specific surface area and good adsorption performance, and can be used for the adsorption of phosphorus in sewage. The activated sludge process will produce a large amount of excess sludge. The excess sludge can be prepared into a functional adsorption material base by pyrolysis, which can effectively realize the recycling of waste. Taking the above-mentioned sludge carbon as the base, by adding elements such as Fe and Ca, its selective adsorption and removal ability of phosphorus can be improved. For example, the patent specification with publication number CN114733486A discloses a method for preparing phosphorus-removing biochar, which is treated with sodium hypochlorite and potassium ferrate, placed in a sealed container, and N2 is introduced. After standing for 12 to 15 hours, the sludge is filtered, dried and sieved to form sludge particles, and then carbonized in an oxygen-limited environment to form phosphorus-releasing biochar, and the phosphorus-releasing biochar is placed in a modified solution formed by a mixture of ferric chloride and calcium chloride for modification, and finally filtered, dried and ground to obtain modified biochar. Utility Model Content

[0007] In view of the deficiencies existing in the art, the utility model provides a sewage carbon-phosphorus capture device on the basis of carbon removal, which has simple operation, small footprint and high phosphorus capture and recovery efficiency.

[0008] A sewage carbon-phosphorus capture device comprises a carbon-phosphorus capture zone and a phosphorus desorption zone separated by a baffle;

[0009] A lifting rotating shaft is arranged in the baffle, and a plurality of fixed rods located above the carbon-phosphorus capture area and the phosphorus desorption area are connected to the rotating shaft, and fillers are hung on the fixed rods.

[0010] In the above-mentioned sewage carbon-phosphorus capture device, the filler can be loaded with a phosphorus removal material with the ability to adsorb and desorb phosphorus. The filler can be switched between the carbon-phosphorus capture zone and the phosphorus desorption zone by a rotating shaft to achieve the removal and capture of carbon and phosphorus in the sewage. Specifically, the corresponding relationship between the fixed rod and the filler thereon and the carbon-phosphorus capture zone and the phosphorus desorption zone can be changed by rotating the rotating shaft, and the filler can leave or enter the corresponding carbon-phosphorus capture zone and phosphorus desorption zone by raising and lowering the rotating shaft.

[0011] In one embodiment, in the sewage carbon-phosphorus capture device, the carbon-phosphorus capture zone is provided with a first water inlet, a first water outlet and a mud outlet in sequence from top to bottom.

[0012] In one embodiment, in the sewage carbon-phosphorus capture device, activated sludge is inoculated in the carbon-phosphorus capture zone, where carbon and phosphorus in the sewage can be captured.

[0013] In one embodiment, in the sewage carbon-phosphorus capture device, the phosphorus desorption zone is provided with a second water inlet and a second water outlet in sequence from top to bottom.

[0014] In one embodiment, the wastewater carbon-phosphorus capture device has a phosphorus-releasing solution in the phosphorus desorption zone. Further, the phosphorus-releasing solution may be an alkaline solution, such as a NaOH solution.

[0015] In one embodiment, the wastewater carbon and phosphorus capture device has a cylindrical slot in the baffle, and the rotating shaft is located in the cylindrical slot;

[0016] The rotating shaft comprises a fixed portion fixedly connected to the bottom and inner wall of the cylindrical hollow groove and a telescopic portion located inside the fixed portion, and a fixed rod 8 is connected to the telescopic portion.

[0017] In one embodiment, in the sewage carbon-phosphorus capture device, the fixed rod is vertically connected to the rotating shaft and is distributed in an umbrella shape.

[0018] In one embodiment, in the sewage carbon and phosphorus capture device, the filler is distributed on the filler strips;

[0019] The bottom of the fixing rod is provided with a convex portion, and the filler strip is fixedly connected to the convex portion; or, the bottom of the fixing rod is provided with a groove, and the filler strip is inserted into the groove and fixedly connected to the fixing rod. Furthermore, the top of the filler strip may have a groove for receiving the convex portion.

[0020] In one embodiment, the wastewater carbon-phosphorus capture device has a filler of artificial synthetic fiber filler on which phosphorus-removing biochar is loaded.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The sewage carbon-phosphorus capture device of the utility model can utilize activated sludge and suspended fillers in the carbon-phosphorus capture zone to simultaneously and efficiently remove organic matter and phosphorus in sewage. After the fillers are saturated with adsorption, they are lifted and rotated to the phosphorus desorption zone for treatment, thereby achieving regeneration of their adsorption capacity and desorption of phosphorus. Moreover, the removal of organic matter and phosphorus in the carbon-phosphorus capture zone and the desorption of phosphorus and regeneration of adsorption capacity of the fillers in the phosphorus desorption zone can be carried out simultaneously.

[0023] The sewage carbon and phosphorus capture device of the utility model has a compact design, saves space, and can effectively remove and capture carbon and phosphorus in sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a sewage carbon and phosphorus capture device in a specific implementation manner;

[0025] Figure 2 for Figure 1 Schematic diagram of the filler strips in a wastewater carbon-phosphorus capture device. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0027] See also Figure 1 A sewage carbon-phosphorus capture device is a cylindrical treatment device as a whole, comprising two semicircular carbon-phosphorus capture zones 4 and phosphorus desorption zones 11 of equal volume separated by a baffle 6 passing through the center of the circle.

[0028] The carbon-phosphorus capture zone 4 is inoculated with activated sludge, where carbon and phosphorus in sewage are captured. The side of the carbon-phosphorus capture zone 4 is provided with a first water inlet 3, a first water outlet 2 and a sludge outlet 1 from top to bottom. The first water inlet 3 is at a certain distance from the top of the carbon-phosphorus capture zone 4 to prevent the sewage during water intake and the sludge-wastewater mixture during treatment from overflowing and thus polluting the phosphorus desorption zone 11. The first water outlet 2 is higher than the height of the sludge after sedimentation to prevent the sludge from flowing out during water discharge, affecting the effluent water quality and the stability of the device. The sludge outlet 1 is located at the bottom of the carbon-phosphorus capture zone 4 and is used to discharge the remaining sludge to maintain the stable operation of the system.

[0029] There is a phosphorus-releasing solution, such as NaOH solution, in the phosphorus desorption zone 11. A second water inlet 12 and a second water outlet 13 are sequentially arranged on the side of the phosphorus desorption zone 11 from top to bottom. The second water inlet 12 is a certain distance away from the top of the phosphorus desorption zone 11, and the second water outlet 13 is located at the bottom of the phosphorus desorption zone 11, so as to facilitate the recovery of the phosphorus-rich solution.

[0030] There is a cylindrical hollow groove 14 in the baffle 6, and there is a liftable rotating shaft 5 inside the cylindrical hollow groove 14. The rotating shaft 5 includes a fixed part fixedly connected to the bottom of the sewage carbon-phosphorus capture device and the inner wall of the cylindrical hollow groove 14, and a retractable part located in the fixed part. The ratio of the length of the retractable part to the height of the carbon-phosphorus capture zone 4 and the phosphorus desorption zone 11 can be 1:1. Connected to the retractable part are multiple fixed rods 8 located above the carbon-phosphorus capture zone 4 and the phosphorus desorption zone 11. The fixed rods 8 are vertically connected to the rotating shaft 5 with the rotating shaft 5 as the center of the circle, and are distributed in an umbrella shape. The fixed rods 8 are spaced at a certain angle to facilitate the placement of the agitator. In this embodiment, cylindrical protrusions 7 with uniform spacing are arranged at the bottom of the fixed rod 8, which can be used to fix the filler strips 9, combined with Figure 2 , a cylindrical slot 15 is provided at the top of the filler strip 9, which can be connected to the cylindrical protrusion 7 under the fixed rod 8 to achieve fixed suspension and replacement of the filler strip 9. In other embodiments, a groove can be provided at the bottom of the fixed rod 8, and the top of the filler strip 9 is not provided with a slot 15, but is designed to be a structure matching the groove, so that the filler strip 9 can be directly inserted into the groove to achieve a fixed connection with the fixed rod 8, or directly pulled out of the groove to achieve replacement. The filler strip 9 is arranged with circular fillers 10 with fixed spacing and uniform distribution. The filler 10 can be an artificial synthetic fiber filler, on which phosphorus removal biochar is loaded.

[0031] The above-mentioned wastewater carbon-phosphorus capture device can simultaneously capture carbon-phosphorus and recover phosphorus, and its operation mode is as follows:

[0032] The sewage enters from the first water inlet 3 of the carbon-phosphorus capture zone 4. After the water inlet is completed, the rotating shaft 5 descends after rotating 180°. At this time, half of the filler 10 is immersed in the carbon-phosphorus capture zone 4, and the other half is immersed in the phosphorus desorption zone 11. The phosphorus removal biochar loaded on the filler 10 in the carbon-phosphorus capture zone 4 adsorbs the phosphorus in the sewage, thereby reducing the phosphorus concentration of the sewage. At the same time, the activated sludge in the zone degrades organic pollutants, thereby simultaneously capturing carbon and phosphorus, so that the effluent index meets the discharge standard. At the same time, the phosphorus removal biochar loaded on the filler 10 in the phosphorus desorption zone 11 desorbs phosphorus in the phosphorus release solution. After the adsorption and desorption are completed, the rotating shaft 5 rises, so that the biochar leaves the carbon-phosphorus capture zone 4 and the phosphorus desorption zone 11, and waits for the sludge in the carbon-phosphorus capture zone 4 to settle, and the treated sewage that meets the standards is discharged. After that, new sewage enters the carbon-phosphorus capture zone 4, and the second round of treatment begins. The rotating shaft 5 descends after rotating 180°. At this time, the phosphorus removal biochar that has just been desorbed and has restored its adsorption capacity is immersed in the carbon-phosphorus capture zone 4, while the other half of the filler 10 is immersed in the phosphorus desorption zone 11 for desorption to release the phosphorus adsorbed in the first round. It should be noted that water must be in and out of the carbon-phosphorus capture zone 4 for each round of treatment, while the entry and discharge of the phosphorus release solution in the phosphorus desorption zone 11 can be separated by several rounds. After several rounds of circulation, the phosphorus content of the phosphorus release solution in the phosphorus desorption zone 11 is close to saturation, becoming a phosphorus-rich solution and discharged from the second water outlet 13, and a new phosphorus release solution enters from the second water inlet 12. The discharged phosphorus-rich solution can be recycled. When the phosphorus removal biochar is used until the regeneration capacity is significantly reduced or the regeneration capacity is lost, the filler strip 9 should be removed and the phosphorus removal biochar on the filler 10 should be replaced. In addition, an appropriate amount of mud is discharged through the mud outlet 1 in each round to maintain the microbial concentration in the carbon-phosphorus capture zone 4 at a certain level to ensure the stable operation of the system. The phosphorus removal biochar can be made by pyrolysis of the discharged residual sludge.

[0033] The sewage carbon and phosphorus capture device of the utility model has the following characteristics:

[0034] 1) In this device, carbon-phosphorus capture and phosphorus recovery are carried out simultaneously, saving time and space;

[0035] 2) Phosphorus removal materials (such as phosphorus removal biochar) with the ability to adsorb and desorb phosphorus can be prepared using the excess sludge discharged from the carbon-phosphorus capture area and can be reused, saving materials and costs;

[0036] 3) After a certain number of rounds, the phosphorus-released solution in the phosphorus desorption zone becomes a phosphorus-rich solution and can be recycled;

[0037] 4) This device can achieve automatic control in a certain way, and its operation and management are convenient.

[0038] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A sewage carbon and phosphorus capture device, characterized in that: It includes a carbon-phosphorus capture zone (4) and a phosphorus desorption zone (11) separated by a baffle (6); A lifting and lowering rotating shaft (5) is arranged in the baffle (6); a plurality of fixed rods (8) located above the carbon-phosphorus capture area (4) and the phosphorus desorption area (11) are connected to the rotating shaft (5); and fillers (10) are suspended on the fixed rods (8).

2. The sewage carbon and phosphorus capture device according to claim 1, characterized in that: The carbon-phosphorus capture zone (4) is provided with a first water inlet (3), a first water outlet (2) and a mud discharge outlet (1) in sequence from top to bottom.

3. The sewage carbon and phosphorus capture device according to claim 1, characterized in that: The carbon and phosphorus capture zone (4) is inoculated with activated sludge.

4. The sewage carbon and phosphorus capture device according to claim 1, characterized in that: The phosphorus desorption zone (11) is provided with a second water inlet (12) and a second water outlet (13) in sequence from top to bottom.

5. The sewage carbon and phosphorus capture device according to claim 1, characterized in that: The phosphorus desorption zone (11) is filled with a phosphorus releasing solution.

6. The sewage carbon and phosphorus capture device according to claim 1, characterized in that: A cylindrical hollow groove (14) is provided in the baffle (6), and the rotating shaft (5) is located in the cylindrical hollow groove (14); The rotating shaft (5) comprises a fixed part fixedly connected to the bottom and inner wall of the cylindrical hollow groove (14) and a telescopic part located inside the fixed part, and a fixed rod (8) is connected to the telescopic part.

7. The sewage carbon and phosphorus capture device according to claim 1, characterized in that: The fixed rod (8) is vertically connected to the rotating shaft (5) and is distributed in an umbrella shape.

8. The sewage carbon and phosphorus capture device according to claim 1, characterized in that: Fillers (10) are distributed on the filler strips (9); A convex portion (7) is provided at the bottom of the fixing rod (8), and the filler strip (9) is fixedly connected to the convex portion (7); or a groove is provided at the bottom of the fixing rod (8), and the filler strip (9) is inserted into the groove and fixedly connected to the fixing rod (8).

9. The sewage carbon and phosphorus capture device according to claim 8, characterized in that: The top of the filler strip (9) is provided with a slot (15) for receiving the convex portion (7).

10. The sewage carbon and phosphorus capture device according to claim 1, characterized in that: The filler (10) is an artificial synthetic fiber filler on which phosphorus removal biochar is loaded.

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