Device for rapidly removing PAM from sludge material and its using method

Abstract

The present invention relates to the field of sludge resource utilization, and discloses a device for rapidly removing PAM from sludge materials, which includes a sludge bin. A photosensitizer bin is arranged on one side of the sludge bin. The lower end of the sludge bin is connected to a first conveyor belt, and the lower end of the photosensitizer bin is connected to a second conveyor belt. The first conveyor belt and the second conveyor belt are connected in sequence. The side of the second conveyor belt away from the first conveyor belt is connected to a third conveyor belt, and the side of the third conveyor belt away from the second conveyor belt is connected to a fourth conveyor belt. A turning and dialing cylinder and a rectifying and combing material plate are arranged above the third conveyor belt, and ultraviolet lamps are arranged at the upper ends of the turning and dialing cylinder and the rectifying and combing material plate. The present invention can be used for the resource utilization of sludge, effectively reduce the PAM content in sludge, and improve the resource utilization efficiency of sludge.

Description

Technical Field

[0001] The present invention relates to the field of sludge resource utilization, and particularly to a device for rapidly removing PAM from sludge materials and a method for using the same. Background Art

[0002] Generally, for the treatment of sewage in sewage treatment plants, in the final stage, PAM needs to be added to flocculate heterogeneous substances such as organic fragments, bacterial cells, inorganic particles, and colloids in the sewage; the treated sludge will carry PAM.

[0003] In the disposal of sludge, according to the existing technical solutions, the commonly used methods include incineration, landfill, and harmless treatment. One of the harmless treatments is resource utilization; since incineration requires a supporting incineration power plant, and there are not many cities with incineration power plants, which limits its treatment method; the main destination of landfill is the landfill site. Due to the promulgation of new regulations, the moisture content of the landfill waste is required to be below 60%, and there are also certain limitations on the leaching limits of heavy metals and organic pollutants. Therefore, landfill sites generally do not want to accept sludge.

[0004] Therefore, the resource utilization of sludge has become the preferred method; when sludge needs to be resourceful, especially when it needs to be dried before utilization, due to the presence of a certain amount of PAM in the sludge, and PAM will reduce the density of the sludge and have a larger porosity, it is difficult to achieve the purpose of removing moisture during natural drying. For this reason, we have designed a device and a method for reducing the PAM content in sludge during sludge resource utilization.

[0005] In addition, in small and medium-sized beneficiation enterprises, their general process flow is to first grind the materials into powder with a high-pressure mill, then heat and dissolve them, and then add various agents to dissolve the metal powder in the aqueous solution. Finally, PAM is added to separate the impurities from the aqueous solution, and the precipitate is used as slag and discharged to the slag yard (commonly known as the yard). Due to the fact that the current beneficiation technology is difficult to improve in a short time, there is still a certain grade of metal in the waste residue that is discharged to the yard through pipelines. When the mine has no ore to be mined and the beneficiation technology is improved, the tailings will be reselected. However, before re-selection, it is necessary to remove PAM from the waste materials that have used PAM to reduce their viscosity, increase their hydrophilicity, and enhance their wetting ability for low-grade slag, so as to carry out further separation and screening. Therefore, this method can be used in the re-selection of tailings in beneficiation plants. Summary of the Invention

[0006] The main object of the present invention is to provide a device for rapidly removing PAM from sludge materials and a method for using the same, which can effectively solve the problem of excessive PAM content in the process of sludge resource utilization as mentioned in the above background art. At the same time, this method can also be used in the re-selection of tailings in beneficiation plants.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A device for quickly removing PAM from sludge materials, comprising a sludge bin, a photosensitizer bin is arranged on one side of the sludge bin, a first conveyor belt is connected to the lower end of the sludge bin, a second conveyor belt is connected to the lower end of the photosensitizer bin, the first conveyor belt and the second conveyor belt are connected in sequence, a third conveyor belt is connected to the side of the second conveyor belt away from the first conveyor belt, a fourth conveyor belt is connected to the side of the third conveyor belt away from the second conveyor belt, a flow-through ultrasonic vibrating bed is connected to the side of the fourth conveyor belt away from the third conveyor belt, a turning dial and a rectifying combing plate are arranged above the third conveyor belt, and ultraviolet lamps are arranged at the upper ends of the turning dial and the rectifying combing plate.

[0009] Preferably, electromagnetic valves are connected to the lower discharge ports of the sludge bin and the photosensitizer bin, the turning dial and the rectifying combing plate are both installed on a mounting frame, the turning dial and the rectifying combing plate are arranged at intervals in sequence, and the ultraviolet lamps are fixedly installed on the top of the mounting frame.

[0010] Preferably, the turning dial comprises a rotating cylinder and a dial plate, the dial plate is fixedly connected to the rotating cylinder, the rotating cylinder is rotatably installed on the mounting frame, the rectifying combing plate is fixedly installed on the mounting frame, and a plurality of combing teeth are fixedly connected to the lower end of the rectifying combing plate.

[0011] Preferably, the ultraviolet lamps adopt BUV lamps, the wavelength of the BUV lamps is 300 - 400nm to better generate the photoelectric effect, and the ultraviolet lamps adopt 60w lamps and matching ballasts.

[0012] A using method of a device for quickly removing PAM from sludge materials, comprising the following steps:

[0013] S1. The sludge enters the first conveyor belt through the sludge bin, and then the sludge is conveyed to the second conveyor belt, and the photosensitizer bin quantitatively sprinkles the photosensitizer on the sludge on the second conveyor belt;

[0014] S2. The sludge and the photosensitizer are conveyed on the third conveyor belt, the rotating cylinder drives the dial plate to rotate, the dial plate flips the sludge on the third conveyor belt, the sludge is loosened and rectified through the rectifying combing plate and the combing teeth at its lower end, and at the same time, the ultraviolet light of the ultraviolet lamps reacts with PAM in the sludge in all directions;

[0015] S3. Finally, the sludge enters the ultrasonic vibrating bed through the fourth conveyor belt to further decompose the PAM in the sludge.

[0016] Preferably, the preparation method of the photosensitizer comprises the following steps:

[0017] S1. Crush the granular oxygen to form powdered granular oxygen, with its active oxygen content calculated as 13.5% and effective utilization rate of 85%.

[0018] S2. Add ferrous sulfate heptahydrate (FeSO4·7H2O). The mass ratio of granular oxygen to ferrous sulfate is 7.2:1.4 for mixing. After mixing evenly, add azo pigment lightfast product blue lake (cas number 1325 - 87 - 7) accounting for 0.8% of the mass of the mixture, and the required lightfastness is below 3.

[0019] S3. Stir the three materials in a plastic container under a dry and dark environment for sufficient reaction for standby.

[0020] Preferably, the experiment for measuring the amount of PAM in sludge includes:

[0021] Irradiation time: The time is designed according to three periods of 5 min, 10 min, and 15 min.

[0022] Basic test method: Take a certain amount of sample. At a specified temperature, such as 25°C, the ratio of the time required for 200 ml of the sample to flow out from the Engler viscometer to the time (seconds) required for the same volume of distilled water to flow out at 20°C is represented by the symbol Et.

[0023] Discrimination criterion: When the time taken by the treated material is fixed and the Engler viscosity and Et = 0.5 - 0.7, it can be determined that PAM has been removed.

[0024] Power: The relationship curves of time, power, and viscosity; to determine the optimal ultraviolet light irradiation time, the power of the required lamp tube, the degradation rate, and the best degradation rate under the optimal conditions; in view of this, it can be represented by a mathematical model.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The sludge in this device is conveyed on the third conveyor belt. During the conveying process, PAM in the sludge is removed by ultraviolet lamp tubes. During the irradiation of the ultraviolet lamp tubes, the rotating cylinder (12) drives the baffle (13) to rotate. The baffle (13) flips the sludge on the third conveyor belt (5), and the sludge is loosened and rectified through the rectifying combing plate (9) and the combing teeth (14) at its lower end, enabling the sludge to be irradiated by the ultraviolet lamp tubes in a larger range and improving the treatment efficiency of the sludge.

[0027] 2. The photosensitizer of this device is prepared by pulverizing granular oxygen to form powdered granular oxygen, with its active oxygen content calculated as 13.5% and an effective utilization rate of 85%; ferrous sulfate heptahydrate (FeSO4·7H2O) is added, and the mass ratio of granular oxygen to ferrous sulfate is mixed at 7.2:1.4. After mixing evenly, 0.8% of azo pigment lightfast blue lake (cas number 1325-87-7) based on the mass of the mixture is added, and the lightfastness is required to be below 3; the three materials are stirred in a plastic container in a dry and dark environment for full reaction and then used in the following steps, which can effectively improve the light absorption rate.

[0028] 3. In this device, the Engler viscosity method is used for determination. The front and rear ends of the material are diluted to a saturated solution state with deionized water, then sieved through a 200-mesh sieve, and then compared before and after, so as to accurately measure the amount of PAM in the sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 It is a front view of the combing plate in the present invention.

[0031] Figure 3 It is a bottom view of the combing plate in the present invention.

[0032] Figure 4 It is a front view of the flipping and dialing cylinder in the present invention.

[0033] Figure 5 It is a planar representation diagram of the orthogonal test data fitting of time, ultraviolet lamp power and viscosity in the experiment for measuring the amount of PAM in sludge in the present invention.

[0034] In the figure: 1. sludge bin; 2. photosensitizer bin; 3. first conveyor belt; 4. second conveyor belt; 5. third conveyor belt; 6. fourth conveyor belt; 7. ultrasonic vibrating bed; 8. flipping and dialing cylinder; 9. rectifying combing plate; 10. ultraviolet lamp tube; 11. mounting rack; 12. rotating cylinder; 13. dialing plate; 14. combing teeth. DETAILED DESCRIPTION OF THE INVENTION

[0035] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0036] Such as Figures 1-4As shown in the figure, a device for quickly removing PAM from sludge materials includes a sludge bin 1. A photosensitizer bin 2 is arranged on one side of the sludge bin 1. The lower end of the sludge bin 1 is connected to a first conveyor belt 3, and the lower end of the photosensitizer bin 2 is connected to a second conveyor belt 4. The first conveyor belt 3 and the second conveyor belt 4 are connected in sequence. On the side of the second conveyor belt 4 away from the first conveyor belt 3, there is a third conveyor belt 5 connected. On the side of the third conveyor belt 5 away from the second conveyor belt 4, there is a fourth conveyor belt 6 connected. On the side of the fourth conveyor belt 6 away from the third conveyor belt 5, there is a flow-through ultrasonic vibrating bed 7 connected. Above the third conveyor belt 5, there are a turning and dialing cylinder 8 and a rectifying and combing plate 9. An ultraviolet lamp tube 10 is arranged at the upper ends of the turning and dialing cylinder 8 and the rectifying and combing plate 9.

[0037] Solenoid valves are connected to the lower discharge ports of the sludge bin 1 and the photosensitizer bin 2. By opening the solenoid valves, the materials in the sludge bin 1 fall onto the first conveyor belt 3. As the first conveyor belt 3 conveys, the sludge is transported to the second conveyor belt ④. The photosensitizer in the photosensitizer bin 2 falls onto the sludge on the second conveyor belt 4. The photosensitizer improves the light absorption rate and can absorb more ultraviolet light during the subsequent degradation process, thereby improving the degradation efficiency of PAM.

[0038] Both the turning and dialing cylinder 8 and the rectifying and combing plate 9 are installed on a mounting frame 11. The turning and dialing cylinder 8 and the rectifying and combing plate 9 are arranged at intervals in sequence. The ultraviolet lamp tube 10 is fixedly installed on the top of the mounting frame 11.

[0039] The turning and dialing cylinder 8 includes a rotating cylinder 12 and a dialing plate 13. The dialing plate 13 is fixedly connected to the rotating cylinder 12. The rotating cylinder 12 is rotatably installed on the mounting frame 11. The rectifying and combing plate 9 is fixedly installed on the mounting frame 11. A plurality of combing teeth 14 are fixedly connected to the lower end of the rectifying and combing plate 9. When the sludge with photosensitizer is conveyed to the third conveyor belt 5 through the second conveyor belt 4, the rotating cylinder 12 drives the dialing plate 13 to rotate, and the dialing plate 13 turns over the sludge on the third conveyor belt 5, and the sludge is loosened and rectified through the rectifying and combing plate 9 and the combing teeth 14 at its lower end.

[0040] The ultraviolet lamp tube 10 uses a BUV lamp tube. The wavelength of the BUV lamp tube is 300 - 400nm to better generate the photoelectric effect. The ultraviolet lamp tube 10 uses a 60w lamp tube and a supporting ballast. Through the irradiation of the ultraviolet lamp tube 10, the PAM in the sludge on the third conveyor belt 5 is degraded. Since during the degradation process, the sludge is turned over and loosened through the turning and dialing cylinder 8 and the rectifying and combing plate 9, the PAM in the sludge can be degraded as completely as possible.

[0041] The preparation method of the photosensitizer used in this device to improve the light absorption rate of sludge includes the following steps:

[0042] (1). Crush the granular oxygen to form powdered granular oxygen, with an active oxygen content of 13.5% and an effective utilization rate calculated as 85%;

[0043] (2) Add ferrous sulfate heptahydrate (FeSO4·7H2O). The mass ratio of granular oxygen to ferrous sulfate is 7.2:1.4 for mixing. After mixing evenly, add azo pigment lightfast permanent blue lake (cas number 1325-87-7) accounting for 0.8% of the mixture mass, and the required lightfastness is below 3.

[0044] (3) Stir the three materials in a plastic container in a dry and dark environment for sufficient reaction and keep them for use.

[0045] Quantitative experiment on the photosensitizer needed in sludge:

[0046] The principle of PAM degradation in sludge is

[0047]

[0048] Generally, for the sewage treatment in sewage treatment plants, PAM is added in the final stage to flocculate the inhomogeneous substances such as organic fragments, bacterial cells, inorganic particles, and colloids in the sewage. According to tests and experience, the solid content of the general water body of inhomogeneous substances is 100 - 500 mg.DS / L (ppm).

[0049] The amount of PAM added to the water body is 10 - 20 g / m 3 ; According to the detection, the effective rate of PAM is 80%, so the PAM that plays a cross-linking role in the material is 80% of the total dosage.

[0050] According to the proportion of sewage solid content, the dosage of PAM added and its effective rate, taking the average value, it is measured that each kg of dry sludge contains 40 g of PAM. Due to environmental protection requirements, the current moisture content of sludge is above 60%; therefore, calculated by wet sludge, each kg of wet sludge contains 24 g of PAM.

[0051] According to the above chemical reaction formula and the content of PAM in wet sludge, the amount of oxygen molecules needed can be determined. That is, for every 4 parts by mass of PAM monomers, 15 parts of oxygen molecules are needed. Then, each kg of wet sludge needs 81 g of oxygen. In the photosensitizer that has been prepared, the content of effective active oxygen is 13.5%. Therefore, 600 g of photosensitizer is needed in each kg of wet sludge containing 24 g of PAM.

[0052] The following experiment will be carried out based on this benchmark, that is, on the basis of adding 600 g of photosensitizer to each kg of wet sludge, the experiment on the degradation efficiency and performance will be carried out.

[0053] Experiment on the determination of the amount of PAM in sludge:

[0054] Irradiation time: The time is designed according to three periods: 5 min, 10 min, and 15 min.

[0055] Transformation of detection means: The conventional method for detecting PAM concentration is the method using tin tetrachloride. Since this method requires the preparation of test reagents and is relatively complex, which is not conducive to rapid detection, the method used in this experiment to determine the PAM concentration is the Engler viscosity method. Dilute both the front end and the rear end of the material with deionized water to the saturated solution state, then screen with a 200-mesh filter screen, and then make a comparison before and after.

[0056] Its basic test method: Engler viscosity is also called Engler viscosity. Take a certain amount of the sample, at a specified temperature, such as 25 °C, the ratio of the time required for 200 ml of the sample to flow out from the Engler viscometer to the time (seconds) required for distilled water to flow out the same volume at 25 °C is represented by the symbol Et.

[0057] Criterion for discrimination: When the time taken for the treated sludge material is fixed and the Engler viscosity, i.e., Et = 0.5 - 0.7, it can be determined that the PAM has been removed.

[0058] Power: The relationship curve of time, ultraviolet lamp power and viscosity. To determine the optimal ultraviolet light irradiation time and the required lamp power, as well as the degradation rate and the best degradation rate under the optimal conditions. In view of this, it can be represented by a mathematical model.

[0059] Experimental data using the orthogonal method:

[0060]

[0061]

[0062] The plane representation diagram fitted according to the data is as Figure 5 shown;

[0063] Establish a mathematical model: The mathematical model z = -0.7033 + 0.0419 * x + 0.0084 * y

[0064]

[0065] x, y, and z represent time, ultraviolet lamp power, and kinematic viscosity ratio respectively.

[0066] Since it is impossible to make 100% of the material participate in the reaction during the process of turning and ultraviolet light irradiation of the sludge material, in the second stage, an additional ultrasonic vibrating screen is added. [[ID=;39]]

[0067] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above examples. What is described in the above examples and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A device for quickly removing PAM from sludge materials, including a sludge bin (1), characterized in that: On one side of the sludge bin (1), a photosensitizer bin (2) is provided. The lower end of the sludge bin (1) is connected to a first conveyor belt (3), and the lower end of the photosensitizer bin (2) is connected to a second conveyor belt (4). The first conveyor belt (3) and the second conveyor belt (4) are connected in sequence. On the side of the second conveyor belt (4) away from the first conveyor belt (3), a third conveyor belt (5) is connected. On the side of the third conveyor belt (5) away from the second conveyor belt (4), a fourth conveyor belt (6) is connected. On the side of the fourth conveyor belt (6) away from the third conveyor belt (5), a flow-through ultrasonic vibrating bed (7) is connected. Above the third conveyor belt (5), a flipping drum (8) and a rectifying material combing plate (9) are provided. At the upper ends of the flipping drum (8) and the rectifying material combing plate (9), an ultraviolet lamp tube (10) is provided; The ultraviolet lamp tube (10) uses a UVB lamp tube. The wavelength of the UVB lamp tube is 300 - 400 nm to better generate the photovoltaic effect. The ultraviolet lamp tube (10) uses a 60w lamp tube and a supporting ballast; The preparation method of the photosensitizer includes the following steps: S1. Crush the granular oxygen to form powdered granular oxygen, with an active oxygen content of 13.5% and an effective utilization rate calculated as 85%; S2. Add ferrous sulfate heptahydrate (FeSO4·7H2O). The mass ratio of granular oxygen to ferrous sulfate is 7.2:1.4 for mixing. After mixing evenly, then add 0.8% of azo pigment lightfast blue lake cas number 1325 - 87 - 7 based on the mass of the mixture, with a lightfastness requirement of below 3; S3. Stir the three materials in a dry environment, a dark environment, and a plastic container for sufficient reaction for standby.

2. The device for rapidly removing PAM from sludge materials according to claim 1, wherein: On the lower discharge ports of both the sludge bin (1) and the photosensitizer bin (2), electromagnetic valves are connected. Both the flipping drum (8) and the rectifying material combing plate (9) are installed on the mounting frame (11). The flipping drum (8) and the rectifying material combing plate (9) are arranged at intervals in sequence. The ultraviolet lamp tube (10) is fixedly installed on the top of the mounting frame (11).

3. The device for rapidly removing PAM from sludge materials according to claim 1, wherein: The flipping drum (8) includes a rotating cylinder (12) and a baffle (13). The baffle (13) is fixedly connected to the rotating cylinder (12). The rotating cylinder (12) is rotatably installed on the mounting frame (11). The rectifying material combing plate (9) is fixedly installed on the mounting frame (11). At the lower end of the rectifying material combing plate (9), a plurality of material combing teeth (14) are fixedly connected.

4. A method for using a device for quickly removing PAM from sludge material, which uses a device for quickly removing PAM from sludge material as described in any one of claims 1-3, and is characterized in that: It includes the following steps: S1. The sludge enters the first conveyor belt (3) through the sludge bin (1), and then the sludge is conveyed to the second conveyor belt (4). The photosensitizer bin (2) quantitatively sprinkles the photosensitizer on the sludge on the second conveyor belt (4); S2. The sludge and the photosensitizer are conveyed on the third conveyor belt (5). The rotating cylinder (12) drives the baffle (13) to rotate. The baffle (13) flips the sludge on the third conveyor belt (5). Through the rectifying material combing plate (9) and the material combing teeth (14) at its lower end, the sludge is loosened and rectified. At the same time, the ultraviolet light of the ultraviolet lamp tube (10) reacts comprehensively with PAM in the sludge; S3. Finally, the sludge enters the ultrasonic vibrating bed (7) through the fourth conveyor belt (6) to further decompose the PAM in the sludge.

5. The usage method of a device for quickly removing PAM from sludge materials according to claim 4, characterized in that: The experiments for measuring the amount of PAM in the sludge include: Irradiation time: The time is designed according to three periods of 5 min, 10 min, and 15 min. Basic test method: Take a certain amount of sample. At a specified temperature of 25 °C, the ratio of the time required for 200 ml of the sample to flow out from the Engler viscometer to the time required for the same volume of distilled water to flow out at 25 °C is represented by the symbol Et, and the time is in seconds. Discrimination criterion: When the time taken for the treated material is fixed and the Engler viscosity, i.e., Et = 0.5 - 0.7, it can be determined that the PAM has been removed. Power: The relationship curve of time, power, and viscosity; to determine the optimal ultraviolet light irradiation time and the required power of the lamp tube, as well as the degradation rate and the best degradation rate under the optimal conditions; in view of this, it is represented by a mathematical model.

Images