Ionizing radiation-electroosmosis coupled sludge deep dewatering and harmless treatment device, system and method

Abstract

This application provides an ionizing radiation-electroosmosis coupled sludge deep dewatering and harmless treatment device, system, and method. The device includes: an irradiation shielding shell enclosing a closed treatment chamber; an intermediate layer assembly movably disposed within the irradiation shielding shell, dividing it into upper and lower treatment chambers; and an irradiation source disposed in both treatment chambers. The intermediate layer assembly, from top to bottom, comprises a first cathode plate, a first water collection device, and a second anode plate. The top of the upper treatment chamber has the first anode plate; the bottom of the lower treatment chamber, from top to bottom, comprises a second cathode plate and a second water collection device. Both the first and second cathode plates have perforations and are covered with filter screens. This treatment system and method can achieve simultaneous upper-layer irradiation and lower-layer dewatering, or lower-layer irradiation and upper-layer dewatering, offering advantages of high treatment efficiency and safety.

Description

Technical Field

[0001] This application relates to the field of waste sludge treatment technology, specifically to an ionizing radiation-electroosmosis coupled sludge deep dewatering and harmless treatment device, system and method. Background Technology

[0002] With the continuous advancement of urbanization, the production of sludge has been increasing year by year, with a moisture content exceeding 95%. Currently, landfill is the primary method for sludge disposal in my country's urban wastewater treatment plants, with some sludge used for agricultural purposes. According to the standard "Sludge Disposal from Urban Wastewater Treatment Plants—Mixed Landfill Sludge Quality" (GB / T 23485-2009), when sludge is used for mixed landfill, its moisture content must be below 60%. When sludge is used as cover soil for landfills, its moisture content must be below 45%. Furthermore, according to the standard "Sludge Disposal from Urban Wastewater Treatment Plants—Agricultural Sludge Quality" (CJ / T 309-2009), the moisture content of sludge used for agricultural purposes must be below 60%. Therefore, reducing the moisture content of sludge is crucial to solving the difficulties in sludge disposal.

[0003] Among commonly used sludge dewatering methods, mechanical dewatering mainly relies on pressure to forcibly separate sludge from water. However, mechanical dewatering primarily removes free water and a small amount of interstitial water, making it difficult to remove surface water and bound water, and the sludge moisture content can only be reduced to 80%. Sludge thermal drying can further remove moisture from dewatered sludge through heat transfer between the sludge and the heat medium, reducing the sludge volume to meet subsequent disposal requirements. However, high-temperature sludge drying consumes a lot of energy, easily generates odors, and requires strict dust control during the drying process, posing safety hazards.

[0004] Electroosmotic dewatering is a novel method for deep dewatering of sludge. This method utilizes a direct current electric field to cause water to move rapidly from the anode to the cathode, and then detach from the cathode. After treatment with electroosmotic dewatering, the sludge moisture content can be reduced to approximately 60%. This method has attracted widespread attention from researchers due to its short dewatering time and low energy consumption.

[0005] However, most of the bound water in sludge exists in extracellular polymeric substances (EPS), but traditional electro-osmosis processes have low EPS degradation rates. Furthermore, compared to anode sludge, cathode sludge has a lower EPS removal rate, resulting in a moisture content exceeding 70%, which limits further disposal of dewatered sludge. Therefore, to improve the dewatering performance of activated sludge during electro-dewatering and further break through the dewatering limit moisture content, appropriate treatment methods must be selected to efficiently destroy the EPS in the sludge before the electro-dewatering process.

[0006] In recent years, some researchers have used advanced oxidation methods to break down sludge EPS (expanded polystyrene) to release more water for subsequent dewatering via electroosmosis. However, methods such as adding oxidants impose additional environmental burdens. Therefore, researching novel treatment methods to break down sludge EPS is urgently needed.

[0007] Furthermore, electroosmotic dewatering cannot achieve the harmless treatment of sludge. To ensure the long-term stability of the treated sludge and prevent harmful impacts on human health and the ecological environment, additional post-treatment methods are needed. Ionizing radiation can destroy viruses, microorganisms, EPS, etc., in sludge through various rays emitted by radioactive nuclides. It is safe, convenient, reliable, highly efficient, and energy-saving. Ionizing radiation technology has been gradually applied in the sludge treatment industry. Based on this, this patent couples ionizing irradiation technology with electroosmosis technology to propose a novel deep sludge dewatering and harmless treatment system and method to improve sludge dewatering efficiency and promote sludge resource utilization. Summary of the Invention

[0008] The purpose of this application is to provide an ionization irradiation-electroosmosis coupled sludge deep dewatering and harmless treatment device, system and method, which at least solves one of the problems of excessively high overall water content of sludge after electroosmosis dewatering, low EPS degradation rate of sludge, uneven distribution of sludge water content after dewatering, large difference in water content between anode and cathode sludge, and inability to achieve harmless treatment.

[0009] To achieve the above objectives, this application provides the following technical solution:

[0010] In a first aspect, an ionizing radiation-electroosmosis coupled sludge deep dewatering and harmless treatment device is provided, comprising:

[0011] An irradiation shielding shell is used to enclose a closed processing chamber;

[0012] The intermediate layer assembly is movably disposed within the irradiation shielding shell, dividing it into upper and lower processing chambers;

[0013] Irradiation sources are installed in the upper and lower processing chambers;

[0014] The intermediate layer assembly is provided with a first cathode plate, a first water collection device, and a second anode plate from top to bottom; the top of the upper processing chamber is provided with a first anode plate; the bottom of the lower processing chamber is provided with a second cathode plate and a second water collection device from top to bottom; both the first cathode plate and the second cathode plate have holes and are covered with filter screens.

[0015] In the above-mentioned sludge deep dewatering and harmless treatment device, as a preferred embodiment, a first water-proof ring is provided on the outer edge of the intermediate layer component.

[0016] In the above-mentioned sludge deep dewatering and harmless treatment device, as a preferred embodiment, the irradiation source is disposed inside the transparent insulating cylinder, the transparent insulating cylinder penetrates the intermediate layer assembly vertically and is vertically erected in the middle of the irradiation shielding shell; a second water-proof ring is provided at the point where the intermediate layer assembly is penetrated by the transparent insulating cylinder.

[0017] In the aforementioned sludge deep dewatering and harmless treatment device, as a preferred embodiment, the irradiation source is a gamma-ray irradiation source; more preferably, the gamma-ray irradiation source is selected from... 60 Co、 137 At least one of Cs.

[0018] In the above-mentioned sludge deep dewatering and harmless treatment device, as a preferred embodiment, sludge scraping blades are respectively provided above the second cathode plate and below the first anode plate. The sludge scraping blades are respectively connected to motors and are used to transport the dewatered sludge to the sludge discharge ports of the upper and lower treatment chambers.

[0019] In the above-mentioned sludge deep dewatering and harmless treatment device, as a preferred embodiment, the irradiation shielding shell is a shell made of lead material on the outside and polytetrafluoroethylene material on the inside;

[0020] Optionally, the filter screen is made of stainless steel or nylon.

[0021] Optionally, the first anode plate and the second anode plate may be selected from any one of ruthenium-coated titanium plate, iridium-coated titanium plate, stainless steel plate, and graphite plate;

[0022] Optionally, the first cathode plate and the second cathode plate may be made of stainless steel, copper, or nickel.

[0023] Secondly, a sludge deep dewatering and harmless treatment system is provided, including:

[0024] The above-mentioned sludge deep dewatering and harmless treatment device;

[0025] The power subsystem, connected to the intermediate layer assembly, drives it to rise or fall to squeeze the sludge in the corresponding chamber;

[0026] The power supply system is connected to the electrodes of the upper and lower processing chambers respectively, providing direct current for the electroosmotic dehydration process;

[0027] A sludge distribution system is used to supply the treatment device with sludge to be treated;

[0028] The drainage subsystem is used to discharge treated wastewater;

[0029] The sludge discharge system is used to discharge the treated sludge.

[0030] In the above-mentioned sludge deep dewatering and harmless treatment system, as a preferred embodiment, the sludge distribution subsystem includes a sludge distributor and a sludge conveying pipe. The upper treatment chamber is provided with a first sludge conveying port, and the lower treatment chamber is provided with a second sludge conveying port. The sludge distributor is connected to the first sludge conveying port and the second sludge conveying port respectively through the sludge conveying pipe.

[0031] Optionally, the sludge discharge subsystem includes a sludge discharge pipe and a sludge discharge pump. The upper processing chamber is provided with a first sludge discharge port, and the lower processing chamber is provided with a second sludge discharge port. The sludge discharge pipe is connected to the first sludge discharge port and the second sludge discharge port respectively.

[0032] Optionally, the drainage subsystem includes an outlet pipe and a drainage pump. The first water collection device in the upper treatment chamber is provided with a first water outlet, and the second water collection device in the lower treatment chamber is provided with a second water outlet. The outlet pipe is connected to the first water outlet and the second water outlet respectively.

[0033] Optionally, the power supply system includes a power distribution box, which is connected to the first cathode plate and the first anode plate of the upper processing chamber via wires, and also connected to the second cathode plate and the second anode plate of the lower processing chamber via wires.

[0034] Thirdly, a method for deep dewatering and harmless treatment of sludge is provided, which achieves simultaneous upper-layer irradiation and lower-layer dewatering, or lower-layer irradiation and upper-layer dewatering treatment through the aforementioned deep dewatering and harmless treatment system.

[0035] The above-mentioned method for deep dewatering and harmless treatment of sludge includes the following steps:

[0036] S100, the intermediate layer component is adjusted to the middle position, and the sludge to be treated is simultaneously injected into the upper and lower treatment chambers through the sludge distribution subsystem. After the sludge injection is completed, the sludge conveying port is closed; the irradiation source is turned on for irradiation treatment.

[0037] S200, driven by the power subsystem, rises the intermediate layer component, squeezing the sludge to be treated in the upper treatment chamber upwards until it comes into close contact with the first anode plate, the first cathode plate, and the dewatered sludge. At this point, the power supply system provides direct current to the first anode plate and the first cathode plate, initiating the electro-osmotic dewatering process. The dewatered wastewater is discharged through the drainage subsystem, and the treated sludge is discharged through the sludge discharge subsystem. Simultaneously, the irradiation source is exposed in the lower treatment chamber to irradiate the sludge to be treated there.

[0038] In S300, the intermediate layer assembly is driven to descend by the power subsystem, while the sludge distribution subsystem injects sludge to be treated into the upper treatment chamber. The intermediate layer assembly continues to descend and squeeze the sludge to be treated in the lower treatment chamber until it comes into close contact with the second anode plate, the second cathode plate, and the dewatered sludge. At this point, the power supply system supplies DC power to the second anode plate and the second cathode plate to begin electro-osmotic dewatering. The dewatered wastewater is discharged through the drainage subsystem, and the treated sludge is discharged through the sludge discharge subsystem. Simultaneously, the irradiation source is exposed in the upper treatment chamber to irradiate the sludge to be treated there.

[0039] In step S400, the intermediate layer component is driven to rise by the power subsystem, while the sludge distribution subsystem injects sludge to be treated into the lower layer processing chamber, completing the same process as in step S200; thus, the processes of steps S200 and S300 are repeated.

[0040] The technical principle of this application is as follows:

[0041] By coupling ionizing irradiation technology with electroosmosis technology, the shortcomings and deficiencies of electroosmotic dewatering are overcome. Ionizing irradiation disrupts the structure of sludge cells, degrades EPS (extracellular polymeric substances), releases more bound water, and improves the treatment efficiency of electroosmotic dewatering, thereby achieving deep dewatering. Simultaneously, the direct effect of ionizing irradiation can destroy the colloidal properties of sludge, making it easier to dewater. The sludge maintains sufficient fluidity even at low moisture content, effectively reducing the electrical insulation effect and adhesion caused by low sludge moisture content in traditional electroosmotic dewatering technology.

[0042] Compared with the prior art, the beneficial effects of this application are:

[0043] (1) High processing efficiency. The novel sludge deep dewatering and harmless treatment device, system and method of this application couples ionizing radiation and electro-osmotic dewatering, which can effectively degrade EPS and reduce the moisture content of the remaining sludge to 40% to 45%, breaking through the limit of electro-dewatering moisture content, and the efficiency is far higher than that of traditional mechanical and other dewatering devices.

[0044] (2) Safe, reliable, and high-performing. Compared to electroosmotic dewatering, this invention reduces the generation of toxic and harmful gases during sludge dewatering, and improves the biochemical characteristics and biodegradation rate of the sludge. It reduces the difference in moisture content between cathode and anode sludge, resulting in a more uniform moisture content in the discharged sludge cake. The treatment process requires no additives, saving costs while avoiding the risk of pollution from additives in the final disposal.

[0045] (3) The treated sludge has good safety. Ionizing irradiation can kill pathogens in the remaining sludge, and at the same time, ionizing irradiation produces ·OH and e- ions in the water. aq - Activating factors such as H can degrade toxic organic pollutants in water, reduce the content of toxic pollutants in sludge, and effectively achieve harmless treatment of residual sludge and filtered water.

[0046] (4) High dewatering efficiency. The intermediate layer component in the novel sludge deep dewatering and harmless treatment system of this application can move up and down and circulate repeatedly, enabling simultaneous upper-layer irradiation and lower-layer dewatering, or lower-layer irradiation and upper-layer dewatering, thus improving treatment efficiency. Compared with a single-layer system, the double-layer system has a larger processing capacity. Attached Figure Description

[0047] Figure 1This is a schematic diagram of the ionizing radiation-electroosmosis coupled deep dehydration and detoxification system proposed in the embodiments of this application. The intermediate layer component of the system's treatment device is located at the midpoint of the device.

[0048] Figure 2 This is a schematic diagram of the rising state of the intermediate layer component of the ionizing radiation-electroosmosis coupled deep dehydration and detoxification system proposed in the embodiments of this application;

[0049] Figure 3 This is a schematic diagram of the intermediate layer component in the descending state of the ionization radiation-electroosmosis coupled deep dehydration and detoxification system proposed in the embodiments of this application.

[0050] Figure 4 These are front and top views of the sludge scraper blade sludge discharge structure of the sludge discharge subsystem in the ionization irradiation-electroosmosis coupled deep dehydration and harmlessness system proposed in the embodiments of this application.

[0051] In the diagram: 1-Sludge distributor; 2-Sludge conveying pipe; 3-First sludge conveying port; 4-Irradiation shielding shell; 5-Second sludge conveying port; 6-Power subsystem; 7-Transparent insulating cylinder; 8-Irradiation source; 9-First water collection device; 10-Second water collection device; 11-First cathode plate; 12-Second cathode plate; 13-Second anode plate; 14-Sludge scraper blade; 15-First anode plate; 16-First sludge discharge port; 17-First water outlet; 18-Second sludge discharge port; 19-Second water outlet; 20-Electric wire; 21-Distribution box; 22-Sludge discharge pipe; 23-Water outlet pipe; 24-Dewatered sludge treatment device; 25-Wastewater treatment equipment; 26-Motor. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] It should be noted that in the description of this application, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0054] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0055] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0056] To address the technical problems mentioned in the background art, this application proposes embodiments of a novel sludge deep dewatering and harmless treatment system. Specifically, as follows... Figures 1 to 3 As shown, the system includes:

[0057] An ionizing radiation-electroosmosis coupled deep dehydration and detoxification treatment device, comprising:

[0058] An irradiation shielding shell 4 surrounds a closed processing chamber;

[0059] The intermediate layer assembly is movably disposed inside the irradiation shielding shell 4, and is divided into upper and lower processing chambers;

[0060] Irradiation source 8 is located in the upper and lower processing chambers;

[0061] The power subsystem 6 is connected to the intermediate layer assembly and drives it to rise or fall to squeeze the sludge in the corresponding chamber;

[0062] The power supply system is connected to the electrodes of the upper and lower processing chambers respectively, providing direct current for the electroosmotic dehydration process;

[0063] A sludge distribution system is used to supply the treatment device with sludge to be treated;

[0064] The drainage subsystem is used to discharge treated wastewater;

[0065] The sludge discharge system is used to discharge the treated sludge.

[0066] The ionizing irradiation-electroosmosis coupled deep dewatering and harmless treatment device of this application uses an intermediate layer component to divide the treatment space into upper and lower layers. The irradiation source is placed in the treatment space. By moving the intermediate layer component up and down, irradiation treatment and electroosmotic dewatering treatment alternate between the upper and lower treatment chambers, and can be continuously cyclically operated. According to the order of irradiation and energization of the cathode and anode, each batch of sludge entering the treatment device can be treated by first irradiation and then dewatering. The operation process can be divided into two scenarios: irradiation and dewatering, which alternate with each other.

[0067] The following section further elaborates on its various subsystems, devices, components, and their connections.

[0068] In the embodiments of this application, the ionizing radiation-electroosmosis coupled deep dewatering and harmless treatment device is a major component of the novel sludge deep dewatering and harmless treatment system, possessing the dual functions of sludge electro-dewatering and irradiation harmless treatment. Specifically, the treatment device includes: an irradiation shielding shell 4 for forming a closed treatment chamber; an intermediate layer assembly movably disposed within the irradiation shielding shell 4 and dividing it into upper and lower treatment chambers; and an irradiation source 8 disposed within the upper and lower treatment chambers.

[0069] The irradiation shielding shell 4 can be a cylindrical structure, preferably a vertically erected cylindrical shell. The irradiation shielding shell 4 also has an insulating function and can be composed of various composite materials. For example, the irradiation shielding shell 4 can be a shell made of lead material on the outside and polytetrafluoroethylene material on the inside.

[0070] An intermediate layer assembly is disposed within the irradiation shielding shell 4 and divides it into upper and lower processing chambers. The intermediate layer assembly is designed to move vertically, thereby squeezing the sludge in the upper and lower processing chambers at different times. From top to bottom, the intermediate layer assembly includes a first cathode plate 11, a first water collection device 9, and a second anode plate 13. During operation, the first cathode plate 11, the first water collection device 9, and the second anode plate 13 are fixedly connected so that they can move upwards or downwards simultaneously. Correspondingly, a first anode plate 15 is disposed at the top of the upper processing chamber; and from top to bottom, a second cathode plate 12 and a second water collection device 10 are disposed at the bottom of the lower processing chamber. Filter screens are disposed on both the first cathode plate 11 and the second cathode plate 12 to prevent sludge from falling. The filter screens are preferably made of stainless steel or nylon. Generally, the first anode plate 15, the second anode plate 13, the first cathode plate 11, and the second cathode plate 12 are all placed horizontally, and their shape matches the cylindrical cross-sectional shape of the irradiation shielding shell 4, typically being circular. The first anode plate 15 and the second anode plate 13 can be made of ruthenium-coated titanium, iridium-coated titanium, stainless steel, graphite, etc. The first cathode plate 11 and the second cathode plate 12 can be made of materials with good conductivity, such as stainless steel, copper, or nickel. To facilitate the drainage of removed water, the first cathode plate 11 and the second cathode plate 12 are provided with holes, the number and shape of which are not limited. In addition, a first water-proof ring is provided on the outer edge of the intermediate layer assembly, which serves as a basic water barrier to prevent the sewage from the upper and lower treatment chambers from communicating. More specifically, the first water-proof ring is located on the outer edge of the intermediate layer assembly, facing the inner wall of the irradiation shielding shell 4. Typically, the first water-proof ring is made of rubber. The intermediate layer assembly is connected to the external power subsystem 6, which drives it to move upward or downward to squeeze the sludge in the corresponding chamber.

[0071] The irradiation source 8 is used to irradiate the sludge, thereby destroying the cell structure in the sludge, degrading EPS to release more bound water, and disrupting the colloidal properties of the sludge, making it easier to dewater and maintain sufficient fluidity at low moisture content. In the embodiments of this application, the irradiation source 8 is disposed inside a transparent insulating cylinder 7, which penetrates the intermediate layer assembly vertically and is located in the middle of the irradiation shielding shell 4. Correspondingly, a second water-proof ring is provided at the point where the intermediate layer assembly is penetrated by the transparent insulating cylinder 7 (i.e., the inner edge of the through hole), which can play a basic water-proof role, preventing sewage from the upper and lower treatment chambers from communicating through the through hole. In other words, the second water-proof ring is located on the inner edge of the through hole on the intermediate layer assembly, facing the outer wall of the transparent insulating cylinder 7. The irradiation source 8 can be gamma rays, optional. 60 Co、 137 At least one of Cs.

[0072] In the embodiments of this application, such as Figures 1-3 As shown, the upper and lower treatment chambers are each equipped with a sludge conveying port, which is connected to the sludge distribution subsystem to receive the sludge to be treated transported by the sludge distribution subsystem. Specifically, the sludge distribution subsystem includes a sludge distributor 1 and a sludge conveying pipe 5. The upper treatment chamber is equipped with a first sludge conveying port 3, and the lower treatment chamber is equipped with a second sludge conveying port 5. The sludge distributor 1 is connected to the first sludge conveying port 3 and the second sludge conveying port 5 through the sludge conveying pipe 5, thereby realizing the distribution of sludge to the upper and lower treatment chambers.

[0073] In the embodiments of this application, such as Figures 1-3 As shown, scraper blades 14 are respectively installed above the second cathode plate 12 and below the first anode plate 15. The scraper blades 14 are connected to the motor 26. The upper and lower processing chambers are also equipped with sludge discharge ports, which are connected to the sludge discharge subsystem. For example, as... Figure 4As shown, the motor 26 drives the scraper blade 14 to rotate, scraping the dewatered sludge in the upper treatment chamber to the first sludge discharge port 16 for discharge. Typically, the sludge is discharged to an externally located dewatered sludge treatment device 24 for further processing. Specifically, the sludge discharge subsystem includes a sludge discharge pipe 22 and conventional equipment such as a sludge discharge pump and conveyor belt, which will not be described in detail here. Correspondingly, the upper treatment chamber has a first sludge discharge port 16, and the lower treatment chamber has a second sludge discharge port 18. The sludge discharge pipe 22 is connected to both the first and second sludge discharge ports 16 and 18, respectively, thus enabling the sludge discharge function of both the upper and lower treatment chambers. Generally, each batch of sludge in each treatment chamber undergoes irradiation followed by dewatering before the treated sludge (the remaining sludge moisture content can be reduced to 40%–45% using the ionization irradiation + electroosmosis coupling treatment device described in this application) is discharged before the next batch of sludge to be treated is input. The number and position of the first mud outlet 16 should take into account the degree to which the intermediate layer assembly can rise and fall. The first mud outlet 16 should always be located above the first cathode plate 11 of the intermediate layer assembly, and the second mud outlet 18 should be located above the second cathode plate 12.

[0074] In the embodiments of this application, such as Figures 1-3 As shown, both the upper and lower treatment chambers are equipped with outlets connected to a drainage subsystem. The drainage subsystem discharges the wastewater obtained from the electro-osmotic dehydration treatment, typically to an external wastewater treatment unit 25 for further processing. Specifically, the drainage subsystem includes conventional equipment such as outlet pipes 23 and drainage pumps, which will not be elaborated here. Correspondingly, the first water collection device 9 in the upper treatment chamber (i.e., the first water collection device 9 in the intermediate layer assembly) is equipped with a first outlet 17, and the second water collection device 10 in the lower treatment chamber is equipped with a second outlet 19. The outlet pipes 23 are connected to the first outlet 17 and the second outlet 19 respectively, thus enabling the discharge of wastewater from both the upper and lower treatment chambers. The number and location of the first outlets 17 should consider the degree to which the intermediate layer assembly can rise and fall. The first outlets 17 should always be located below the first water collection device 9 of the intermediate layer assembly, and the second outlets 19 should be located below the second water collection device 10. The interiors of the first water collection device 9 and the second water collection device 10 can be arranged horizontally, and the sewage in the final treatment chamber is pumped out by a drain pump (self-priming pump).

[0075] In the embodiments of this application, such as Figures 1-3 As shown, the intermediate layer component should also be connected to the power subsystem 6. The intermediate layer component of the power subsystem 6 can be raised and lowered to squeeze the sewage in the upper and lower treatment chambers respectively.

[0076] In the embodiments of this application, such as Figures 1-3As shown, the sludge deep dewatering and harmless treatment system also includes an electronic power supply system, which is connected to the electrodes of the upper and lower treatment chambers respectively, to supply power (e.g., direct current) to the electro-osmotic dewatering treatment in the treatment chambers; typically, the electronic power supply system includes a distribution box 21, which is connected to the first cathode plate 11 and the first anode plate 15 of the upper treatment chamber via wires 20, and is also connected to the second cathode plate 12 and the second anode plate 13 of the lower treatment chamber via wires 20. During operation, when the intermediate layer component rises and the upper sludge is squeezed into close contact with the first anode plate 15 (i.e., the anode plate, sludge, and cathode plate are in close contact), the power distribution box 21 is turned on to supply DC power to the first anode plate 15 and the first cathode plate 11, and the electro-osmotic dewatering process of the upper sludge begins. When the intermediate layer component descends and the lower sludge is squeezed into close contact with the second anode plate 13 and the second cathode plate 12 (i.e., the anode plate, sludge, and cathode plate are in close contact), the power distribution box 21 is turned on to supply DC power to the second anode plate 13 and the second cathode plate 12, and the electro-osmotic dewatering process of the lower sludge begins.

[0077] After introducing all embodiments of the novel sludge deep dewatering and harmless treatment system proposed in this application, the following describes an embodiment of a novel sludge deep dewatering and harmless treatment method proposed in this application.

[0078] The novel sludge deep dewatering and harmless treatment method is implemented through the novel sludge deep dewatering and harmless treatment system described in the above embodiments, and includes the following steps:

[0079] S100, adjust the intermediate layer component of the treatment device to the middle position (that is, divide the treatment chamber into upper and lower treatment chambers with basically equal volumes), and inject the sludge to be treated into the upper and lower treatment chambers simultaneously through the sludge distribution subsystem. After the sludge injection is completed, close the sludge conveying port; start the irradiation device (for example, remove the lead cover that shields the irradiation source 8), and turn on the irradiation source 8 for irradiation treatment.

[0080] Specifically, in this step, the mud distributor 1 distributes the mud to the device, that is, the sludge is simultaneously injected into the filter cloth of the first cathode plate 11 and the second cathode plate 12 through the mud conveying pipe 2 via the first mud conveying port 3 and the second mud conveying port 5 respectively. After the mud is injected, the mud conveying ports on the irradiation shielding shell 4 are closed; the irradiation device is started (for example, the lead cover shielding the irradiation source 8 is removed), and the irradiation source 8 is turned on for irradiation treatment.

[0081] S200, driven by the power subsystem 6, the intermediate layer component rises and squeezes the sludge to be treated in the upper treatment chamber upwards until it comes into close contact with the first anode plate 15, the first cathode plate 11 and the sludge respectively. At this time, the power supply system supplies DC power to the first anode plate 15 and the first cathode plate 11 to start the electro-osmotic dewatering treatment. The dewatered wastewater is discharged through the drainage subsystem, and the treated sludge is discharged through the sludge discharge subsystem. At the same time, the irradiation source 8 is exposed in the lower treatment chamber to irradiate the sludge to be treated there.

[0082] Specifically, in this step, firstly, the power subsystem 6 applies upward pressure to the intermediate layer component, for example, setting the pressure value to 2 bar, causing the intermediate layer component to rise (e.g., Figure 2 (As shown). When the upper sludge is squeezed and comes into close contact with the first anode plate 15, the power distribution box 21 is turned on to supply DC power to the first anode plate 15 and the first cathode plate 11, and the upper sludge begins the electro-dehydration process. The removed water falls into the first water collection device 9 through the holes on the first cathode plate 11, and then flows into the effluent pipe 23 through the first outlet 17, and then enters the external sewage treatment equipment 25 for treatment. While the intermediate layer assembly moves upward to electro-dehydrate the upper sludge, the irradiation source 8 is exposed in the lower treatment chamber, irradiating the lower sludge through the transparent insulating cylinder 7 to destroy the EPS of the sludge. After the upper sludge is electro-dehydrated, the motor 26 drives the scraper blade 14 to work, and the dewatered sludge enters the sludge discharge pipe 22 through the first sludge discharge port 16, and then enters the dewatered sludge treatment device 24 for treatment. After the upper sludge is discharged, the irradiation process of the lower sludge is also completed.

[0083] S300, the intermediate layer assembly is driven to descend by the power subsystem 6, while the sludge distribution subsystem injects the sludge to be treated into the upper treatment chamber. The intermediate layer assembly continues to descend and squeeze the sludge to be treated in the lower treatment chamber until it comes into close contact with the second anode plate 13, the second cathode plate 12 and the sludge respectively. At this time, the power supply system supplies DC power to the second anode plate 13 and the second cathode plate 12 to start the electro-osmotic dewatering treatment. The dewatered wastewater is discharged through the drainage subsystem, and the treated sludge is discharged through the sludge discharge subsystem. At the same time, the irradiation source 8 is exposed in the upper treatment chamber to irradiate the sludge to be treated there.

[0084] Specifically, in this step, the intermediate layer component begins to move downwards under the action of the power subsystem 6 (e.g., Figure 3As shown), the pressure value is set to, for example, 2 bar. When the intermediate layer assembly descends, the sludge feeder 1 conveys new sludge to be treated onto the filter cloth of the upper first cathode plate 11 through the sludge conveying pipe 2 and the first sludge conveying port 3. After the intermediate layer structure descends past the midpoint of the device, the irradiation source 8 is exposed in the upper treatment chamber to irradiate the new sludge to destroy the EPS (expanded power supply). Under the action of the power subsystem 6, the intermediate layer assembly continues to descend, squeezing the sludge to be treated in the lower treatment chamber until it is in close contact with the second anode plate 13 and the second cathode plate 12 respectively. At this point, the power distribution box 21 is turned on to supply DC power to the second anode plate 13 and the second cathode plate 12, initiating the electro-dehydration process of the lower sludge. The removed water falls through the holes on the second cathode plate 12 into the second water collection device 10, then flows through the second outlet 19 into the outlet pipe 23, and finally enters the wastewater treatment equipment 25 for treatment. After the lower layer of sludge has been electro-dewatered, it enters the sludge discharge pipe 22 through the second sludge discharge port 18, and then enters the dewatered sludge treatment device 24 for processing. At the same time, the irradiation process of the upper layer of sludge is also completed.

[0085] In step S400, the intermediate layer component is driven to rise by the power subsystem 6, while the sludge distribution subsystem injects the sludge to be treated into the lower layer treatment chamber, completing the same treatment as in step S200. Thus, the treatment of steps S200 and S300 is repeated in a cycle to achieve efficient dewatering and harmless treatment by simultaneously irradiating the upper layer and dewatering the lower layer, or irradiating the lower layer and dewatering the upper layer.

[0086] Specifically, in this step, the intermediate layer component begins to move upward under the action of the power subsystem 6 (e.g., Figure 2 (As shown). With the second sludge inlet 5 open, the sludge distributor 1 injects new sludge to be treated onto the filter cloth on the second cathode plate 12 through the sludge conveying pipe 2. As the intermediate layer assembly continues to rise, the upper sludge is compressed and comes into close contact with the first anode plate 15. At this point, the distribution box 21 is opened to supply DC power to the first anode plate 15 and the first cathode plate 11, and the upper sludge begins the electro-dehydration process. The removed water falls through the holes on the first cathode plate 11 into the first water collection device 9, then flows through the first outlet 17 into the outlet pipe 23, and then into the external wastewater treatment equipment 25 for treatment. While the intermediate layer assembly moves upward to electro-dehydrate the upper sludge, the irradiation source 8 is exposed in the lower treatment chamber, irradiating the lower sludge through the transparent insulating cylinder 7 to destroy the EPS of the sludge. After the upper sludge is electro-dehydrated, it enters the sludge discharge pipe 22 through the first sludge discharge port 16, and then enters the dewatered sludge treatment device 24 for treatment. Once the upper layer of sludge has been discharged, the irradiation process of the lower layer of sludge is also complete. This cycle repeats continuously, achieving highly efficient dewatering treatment by simultaneously irradiating the upper layer and dewatering the lower layer, or irradiating the lower layer and dewatering the upper layer.

[0087] The novel sludge deep dewatering and harmless treatment method of this application produces sludge with a moisture content of about 40%-45% after dewatering. Continuous processing further enhances the efficiency of dewatering.

[0088] Test case

[0089] This experimental example describes a comparative experiment between two processes: electroosmotic dewatering treatment alone and the coupled treatment of ionizing irradiation and electroosmotic dewatering as described in this application. The activated sludge was obtained from a wastewater treatment plant in Tianjin, and its basic parameters are shown in Table 1. The experiment used... 60 Co, as an irradiation source, has a radioactivity of 7.4 × 10⁻⁶. 14 Bq, dose rate 190 Gy / min.

[0090] Table 1 Basic physicochemical properties of initial sludge

[0091] index result pH 7.56 Moisture content (%) 99.37 Total solids (TS, mg / L) 8350 Sludge volume index (SVI, mL / g) 42.5

[0092] The novel deep dehydration and detoxification system of this application embodiment uses direct current. In the treatment device, the irradiation shielding shell 4 is a cylindrical body, made of lead outer shell and polytetrafluoroethylene inner material, with an inner diameter of 50cm and a height of 40cm. An irradiation source 8 (radiation source) is installed in the center of the device. 60 The first anode plate 15 and the second anode plate 13 at the top of the device are both circular and made of ruthenium-coated titanium plates. The first cathode plate 11 and the second cathode plate 12 at the bottom are also circular and perforated, made of stainless steel plates (4 mm thick, 2 mm perforation diameter). 40 μm thick stainless steel filter cloths with 44 μm perforation diameters are placed on the first cathode plate 11 and the second cathode plate 12, respectively. The first water collecting device 9 and the second water collecting device 10, located below the first cathode plate 11 and the second cathode plate 12, are 10 cm high. The mechanical pressure during the dehydration process is provided by the power subsystem 6.

[0093] The first water collection device 9 and the second water collection device 10 are ordinary discs with a slight inclination on the inner bottom surface.

[0094] During the experiment, 145 drainage holes with a diameter of 2 mm were drilled on the first cathode plate 11 and the second cathode plate 12 to promptly drain the removed water. Filter cloths with a pore size of 44 μm were placed on the first cathode plate 11 and the second cathode plate 12 to intercept sludge particles. The filtrate from the experiment flowed out through the outlet pipe 23.

[0095] With irradiation source 8 (γ-ray) off, the sludge moisture content can be reduced to 55-65% after 20 minutes of electro-osmotic dewatering. Under normal operating conditions with irradiation source 8 (γ-ray) on, the moisture content of the sludge after electro-dewatering can be reduced to 40-45%. Furthermore, the difference in moisture content between the anode and cathode sludge after the coupled γ-ray + electro-osmotic dewatering treatment is relatively small. During electro-osmotic dewatering alone, the anode sludge moisture content is approximately 50-55%, and the cathode sludge is approximately 65-70%. In the coupled process, the anode sludge moisture content is approximately 38-43%, and the cathode sludge is approximately 45-49%. The sludge floc structure and biological cells are significantly damaged after γ-ray irradiation treatment. The outflow of EPS and intracellular contents increases the content of soluble organic components in the sludge, improving its biodegradability. Simultaneously, the disruption of cell walls (membranes) releases more bound water, thereby improving the dewatering performance of the sludge during subsequent electro-dewatering processes. This dewatering device can alter the main functional groups of extractable EPS in sludge, such as protein and polysaccharide groups, thereby changing the sludge in a direction that is conducive to treatment and disposal.

[0096] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ionizing radiation-electroosmosis coupled sludge deep dewatering and innocuous treatment device, characterized in that, It comprises: a radiation shielding shell (4) which encloses a closed treatment chamber; a middle layer assembly which is movably arranged in the radiation shielding shell (4) and divides it into an upper and a lower treatment chamber; a radiation source (8) arranged in the upper and lower treatment chambers; the radiation source (8) is arranged in a transparent insulating cylinder (7) which penetrates the middle layer assembly and is vertically arranged in the middle of the radiation shielding shell (4); the middle layer assembly is sequentially provided with a first cathode plate (11), a first water collecting device (9), and a second anode plate (13) from top to bottom; the top of the upper treatment chamber is provided with a first anode plate (15); the bottom of the lower treatment chamber is sequentially provided with a second cathode plate (12) and a second water collecting device (10) from top to bottom; the first cathode plate (11) and the second cathode plate (12) both have holes and are paved with filter screens.

2. The sludge deep dewatering and harmless treatment device according to claim 1, characterized in that: the outer side edge of the middle layer assembly is provided with a first water-proof ring.

3. The sludge deep dewatering and harmless treatment device according to claim 1 or 2, characterized in that: the middle layer assembly is provided with a second water-proof ring at the position penetrated by the transparent insulating cylinder (7).

4. The sludge deep dewatering and harmless treatment device according to claim 1 or 2, characterized in that: the radiation source (8) is a gamma ray radiation source.

5. The sludge deep dewatering and innocuous treatment device according to claim 4, wherein The gamma ray irradiation source is selected from 60 Co, 137 at least one of Cs.

6. The sludge deep dewatering and innocuous treatment device according to any one of claims 1 to 2, 5, wherein A sludge scraping paddle (14) is arranged above the second cathode plate (12) and below the first anode plate (15) respectively, and the sludge scraping paddles (14) are connected with motors (26) respectively for conveying the dewatered sludge to the sludge discharge ports of the upper and lower treatment chambers.

7. The sludge deep dewatering and innocuous treatment device according to any one of claims 1 to 2, 5, wherein The radiation shielding shell (4) is a shell made of lead material on the outside and polytetrafluoroethylene material on the inside.

8. The sludge deep dewatering and innocuous treatment device according to claim 7, wherein The filter screens are made of stainless steel or nylon material.

9. The sludge deep dewatering and innocuous treatment device according to claim 7, wherein The first anode plate (15) and the second anode plate (13) are selected from any one of a ruthenium-coated titanium plate, an iridium-coated titanium plate, a stainless steel plate, and a graphite plate.

10. The sludge deep dewatering and innocuous treatment device according to claim 7, wherein The first cathode plate (11) and the second cathode plate (12) are selected from any one of a stainless steel plate, a copper plate, and a nickel plate.

11. A sludge deep dewatering and innocuous system, characterized in that, It comprises: the treatment device according to any one of claims 1-10; a power subsystem which is connected with the middle layer assembly and drives it to ascend or descend to press the sludge in the corresponding chamber; an electricity supply subsystem which is connected with the electrodes of the upper and lower treatment chambers respectively and provides direct current for the electro-osmotic dewatering treatment; a sludge distribution subsystem which is used to provide the treatment device with sludge to be treated; a water drainage subsystem which is used to drain the treated wastewater; a sludge discharge subsystem which is used to discharge the treated sludge.

12. The sludge deep dewatering and harmless system according to claim 11, characterized in that: the sludge distribution subsystem comprises a sludge distributor (1) and a sludge conveying pipeline (2); the upper treatment chamber is provided with a first sludge conveying port (3), and the lower treatment chamber is provided with a second sludge conveying port (5); the sludge distributor (1) is connected with the first sludge conveying port (3) and the second sludge conveying port (5) through the sludge conveying pipeline (2) respectively.

13. The sludge deep dewatering and innocuity system of claim 12, wherein, The sludge discharge subsystem comprises a sludge discharge pipeline (22) and a sludge discharge pump, the upper treatment chamber is provided with a first sludge discharge port (16), the lower treatment chamber is provided with a second sludge discharge port (18), and the sludge discharge pipeline (22) is connected with the first sludge discharge port (16) and the second sludge discharge port (18) respectively; 14. The sludge deep dewatering and innocuity system of claim 12, wherein, The water discharge subsystem comprises a water discharge pipeline (23) and a water discharge pump, the first water collecting device (9) of the upper treatment chamber is provided with a first water discharge port (17), the second water collecting device (10) of the lower treatment chamber is provided with a second water discharge port (19), and the water discharge pipeline (23) is connected with the first water discharge port (17) and the second water discharge port (19) respectively.

15. The sludge deep dewatering and innocuity system of claim 12, wherein, The power supply subsystem comprises a distribution box (21), the distribution box (21) is connected with the first cathode plate (11) and the first anode plate (15) of the upper treatment chamber through wires (20), and is also connected with the second cathode plate (12) and the second anode plate (13) of the lower treatment chamber through wires (20).

16. A method for deep dewatering and innocuous treatment of sludge, characterized by, The sludge deep dewatering and harmless treatment system realizes simultaneous upper irradiation and lower dewatering, or lower irradiation and upper dewatering treatment.

17. The sludge deep dewatering and innocuous method according to claim 16, characterized in that, The method comprises the following steps: S100, the intermediate layer assembly is adjusted to an intermediate position, the sludge to be treated is simultaneously injected into the upper and lower treatment chambers through the sludge distribution subsystem, the sludge injection port is closed after the sludge injection is completed, the irradiation source (8) is turned on for irradiation treatment; S200, the intermediate layer assembly is driven to ascend by the power subsystem, the sludge to be treated in the upper treatment chamber is pressed upward, when the intermediate layer assembly is in close contact with the first anode plate (15), the first cathode plate (11) and the sludge respectively, direct current is supplied to the first anode plate (15) and the first cathode plate (11) by the power supply subsystem, the electric osmosis dewatering treatment is started, the removed sewage is discharged through the water discharge subsystem, and the treated sludge is discharged through the sludge discharge subsystem; meanwhile, the irradiation source (8) is exposed in the lower treatment chamber to irradiate the sludge to be treated therein; S300, the intermediate layer assembly is driven to descend by the power subsystem, the sludge to be treated is injected into the upper treatment chamber by the sludge distribution subsystem, the intermediate layer assembly continues to descend to press the sludge to be treated in the lower treatment chamber downward, when the intermediate layer assembly is in close contact with the second anode plate (13), the second cathode plate (12) and the sludge respectively, direct current is supplied to the second anode plate (13) and the second cathode plate (12) by the power supply subsystem, the electric osmosis dewatering treatment is started, the removed sewage is discharged through the water discharge subsystem, and the treated sludge is discharged through the sludge discharge subsystem; meanwhile, the irradiation source (8) is exposed in the upper treatment chamber to irradiate the sludge to be treated therein; S400, the intermediate layer assembly is driven to ascend by the power subsystem, the sludge to be treated is injected into the lower treatment chamber by the sludge distribution subsystem, and the same treatment as in step S200 is completed; The treatment of steps S200 and S300 is cyclically executed.

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