Ionization irradiation-electroosmosis coupled sludge deep dehydration and innocent treatment device, system and method

Abstract

The invention provides an ionization irradiation-electroosmosis coupled sludge deep dehydration and innocent treatment device, system and method. The device comprises: an irradiation shielding housing which encloses a closed processing chamber; the middle layer assembly is arranged in the irradiation shielding shell in an up-and-down movable mode and divides the irradiation shielding shell into an upper-layer processing chamber and a lower-layer processing chamber; the irradiation sources are arranged in the upper-layer treatment chamber and the lower-layer treatment chamber; the middle layer assembly is sequentially provided with a first cathode plate, a first water collecting device and a second anode plate from top to bottom; a first anode plate is arranged at the top of the upper-layer treatment chamber; a second cathode plate and a second water collecting device are sequentially arranged at the bottom of the lower-layer treatment chamber from top to bottom; and the first cathode plate and the second cathode plate are provided with holes and are paved with filter screens. The treatment system and method can realize simultaneous upper-layer irradiation and lower-layer dehydration or lower-layer irradiation and upper-layer dehydration treatment, and have the advantages of high treatment efficiency, safety and reliability.

Description

Technical Field

[0001] The present application relates to the technical field of excess sludge treatment, and specifically to an ionizing radiation-electro-osmosis coupled sludge deep dehydration and harmless treatment device, system and method. Background Art

[0002] With the continuous advancement of urbanization, the output of sludge has increased year by year, and the moisture content of sludge has reached more than 95%. At present, the sludge disposal of urban sewage treatment plants in my country is mainly landfill, and some sludge is used for agricultural purposes. According to the "Disposal of Sludge in Urban Sewage Treatment Plants-Mixed Landfill Mud" (GB / T 23485-2009), when sludge is used for mixed landfill, the moisture content must be less than 60%. When sludge is used as landfill cover soil, the moisture content must be less than 45%; according to the "Disposal of Sludge in Urban Sewage Treatment Plants-Agricultural Mud" (CJ / T 309-2009), the moisture content of sludge must be less than 60% when used in agriculture. Therefore, reducing the moisture content of sludge is the key to solving the difficulty of sludge disposal.

[0003] Among the commonly used sludge dewatering methods, mechanical dewatering mainly relies on a certain pressure to force the sludge to separate from the water. However, mechanical dewatering mainly removes free water and a small amount of interstitial water, and it is difficult to remove surface water and bound water. The sludge moisture content can only be reduced to 80%. Sludge thermal drying can further remove the moisture in the dewatered sludge through the heat transfer between the sludge and the heat medium to reduce the sludge volume and meet the requirements of subsequent disposal. However, high-temperature sludge drying has high energy consumption and is prone to produce odor. The dust control requirements during the drying process are strict, and there are safety hazards.

[0004] Electro-osmotic dehydration is a new method for deep dehydration of sludge. This method can use the effect of DC electric field to cause water to move quickly from the anode to the cathode, and then separate from the cathode. After treatment by electro-osmotic dehydration, the moisture content of sludge can be reduced to about 60%. This method has short dehydration time and low energy consumption, and has attracted widespread attention from researchers.

[0005] However, most of the bound water in the sludge exists in extracellular polymers (EPS), but the traditional electro-osmosis process has a low degradation rate for EPS. In addition, compared with the anode mud, the EPS removal rate of the cathode mud is lower, resulting in a water content of more than 70% in the cathode mud, which limits the further disposal of the dewatered sludge. Therefore, in order to improve the dehydration performance of activated sludge during the electro-dehydration process and further break through the dehydration limit moisture content, it is necessary to select appropriate treatment methods before the electro-dehydration process to efficiently destroy the EPS of the sludge.

[0006] In recent years, some researchers have used advanced oxidation methods to destroy sludge EPS to release more water for subsequent dehydration using electro-osmosis. However, methods such as adding oxidants will impose additional burdens on the environment. Therefore, it is urgent to study new treatment methods to destroy sludge EPS.

[0007] In addition, electro-osmosis dehydration cannot achieve harmless treatment of sludge. In order to ensure that the treated sludge can be stable for a long time and has no harmful effects on human health and the ecological environment, it is necessary to increase the subsequent placement methods. Ionizing radiation can destroy viruses, microorganisms, EPS, etc. in sludge through various rays emitted by radionuclides. Its operation is safe, convenient, reliable, efficient and energy-saving. Ionizing radiation technology has been gradually applied to the sludge treatment industry. Based on this, this patent couples ionizing irradiation technology with electro-osmosis technology to propose a new sludge deep dehydration and harmless system and method to improve the sludge dehydration efficiency and promote the resource utilization of sludge. Summary of the invention

[0008] The purpose of the present application is to provide an ionizing radiation-electro-osmosis coupled sludge deep dehydration and harmless treatment device, system and method, which at least solves one of the problems of too high overall moisture content of sludge after electro-osmosis dehydration, low EPS degradation rate of sludge, uneven distribution of sludge moisture content after dehydration, large difference in moisture content of anode and cathode sludge, and inability to achieve harmless treatment.

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

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

[0011] A radiation shielding housing encloses a closed processing chamber;

[0012] The middle layer assembly is movably arranged in the radiation shielding shell up and down, and is divided into two layers of processing chambers, the upper and the lower layers;

[0013] Radiation sources disposed in upper and lower processing chambers;

[0014] The middle layer component is provided with a first cathode plate, a first water collecting device, and a second anode plate in sequence 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 collecting device in sequence from top to bottom; the first cathode plate and the second cathode plate both have holes and are covered with filter screens.

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

[0016] In the above-mentioned sludge deep dehydration and harmless treatment device, as a preferred embodiment, the radiation source is arranged in the transparent insulating tube, and the transparent insulating tube penetrates the middle layer component up and down and is vertically established in the middle of the radiation shielding shell; a second water-blocking ring is arranged at the place where the middle layer component is penetrated by the transparent insulating tube.

[0017] In the above-mentioned sludge deep dehydration 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 dehydration and harmless treatment device, as a preferred embodiment, scraper blades are respectively arranged above the second cathode plate and below the first anode plate, and the scraper blades are respectively connected to motors for transporting the dehydrated sludge to the mud discharge ports of the upper and lower treatment chambers.

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

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

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

[0022] Optionally, the first cathode plate and the second cathode plate are made of any one of a stainless steel plate, a copper plate and a nickel plate.

[0023] In the second aspect, a sludge deep dehydration and harmless treatment system is provided, comprising:

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

[0025] A power subsystem connected to the middle layer assembly to drive it to rise or fall to squeeze the sludge in the corresponding chamber;

[0026] The power supply subsystem is connected to the electrodes of the upper and lower processing chambers respectively to provide direct current for the electro-osmotic dehydration process;

[0027] A sludge distribution subsystem, used for providing the sludge to be treated to the treatment device;

[0028] Drainage subsystem, used to discharge treated sewage;

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

[0030] In the above-mentioned sludge deep dehydration and harmless treatment system, as a preferred embodiment, the sludge distribution subsystem includes a sludge distributor and a sludge delivery pipeline, the upper processing chamber is provided with a first sludge delivery port, the lower processing chamber is provided with a second sludge delivery port, and the sludge distributor is connected to the first sludge delivery port and the second sludge delivery port respectively through the sludge delivery pipeline;

[0031] Optionally, the mud discharge subsystem includes a mud discharge pipeline and a mud discharge pump, the upper processing chamber is provided with a first mud discharge port, the lower processing chamber is provided with a second mud discharge port, and the mud discharge pipeline is connected to the first mud discharge port and the second mud discharge port respectively;

[0032] Optionally, the drainage subsystem includes a water outlet pipe and a drainage pump, a first water outlet is provided on the first water collecting device of the upper processing chamber, a second water outlet is provided on the second water collecting device of the lower processing chamber, and the water outlet pipe is connected to the first water outlet and the second water outlet respectively;

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

[0034] On the third aspect, a method for deep dehydration and harmlessness of sludge is provided, and the upper layer irradiation and lower layer dehydration, or lower layer irradiation and upper layer dehydration treatment are realized simultaneously through the above-mentioned deep dehydration and harmlessness system of sludge.

[0035] The above-mentioned sludge deep dehydration and harmless treatment method comprises the following steps:

[0036] S100, adjusting the middle layer assembly to the middle position, injecting the sludge to be treated into the upper and lower processing chambers simultaneously through the mud distribution subsystem, and closing the mud delivery port after the mud injection is completed; turning on the radiation source for radiation treatment;

[0037] S200, the power subsystem drives the middle layer assembly to rise, and squeezes the sludge to be treated in the upper treatment chamber upward until it is in close contact with the first anode plate, the first cathode plate and the dehydrated sludge respectively, and the power supply subsystem supplies direct current to the first anode plate and the first cathode plate, and the electro-osmosis dehydration treatment starts, and the removed sewage is discharged through the drainage subsystem, and the treated sludge is discharged through the sludge discharge subsystem; at the same time, the irradiation source is exposed in the lower treatment chamber to irradiate the sludge to be treated therein;

[0038] S300, the power subsystem drives the middle layer assembly to descend, and at the same time, the mud distribution subsystem injects the sludge to be treated into the upper treatment chamber, and the middle layer assembly continues to descend and squeezes the sludge to be treated in the lower treatment chamber downward until it is in close contact with the second anode plate, the second cathode plate and the dehydrated sludge respectively, and the power supply subsystem supplies direct current to the second anode plate and the second cathode plate, and the electro-osmosis dehydration treatment is started, and the removed sewage is discharged through the drainage subsystem, and the treated sludge is discharged through the mud discharge subsystem; at the same time, the irradiation source is exposed in the upper treatment chamber to irradiate the sludge to be treated therein;

[0039] S400, the power subsystem drives the middle layer assembly to rise, and at the same time the mud distribution subsystem injects the sludge to be treated into the lower processing chamber to complete the same processing as in step S200; thus, the processing of step S200 and step S300 is executed cyclically.

[0040] The technical principles of this application are as follows:

[0041] The ionizing radiation technology and the electro-osmosis technology are coupled to improve the shortcomings and deficiencies of electro-osmosis dehydration. The ionizing radiation destroys the structure of sludge cells, degrades EPS, releases more bound water, and improves the treatment efficiency of electro-osmosis dehydration, thereby achieving the purpose of deep dehydration. At the same time, the direct effect of ionizing radiation can destroy the colloidal properties of sludge, making it easy to dehydrate the sludge. The sludge can still maintain sufficient fluidity at a lower water content, effectively reducing the electrical insulation effect and adhesion caused by the low water content of sludge in traditional electro-osmosis dehydration technology.

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

[0043] (1) High treatment efficiency. The novel sludge deep dehydration and harmless treatment device, system and method of the present application couples ionizing radiation and electro-osmotic dehydration, which can effectively degrade EPS and reduce the moisture content of the remaining sludge to 40% to 45%, breaking through the limit moisture content of electric dehydration, and the efficiency is much higher than other dehydration devices such as traditional machinery.

[0044] (2) Safe, reliable and good performance. Compared with electro-osmosis dehydration, the invented device reduces the generation of toxic and harmful gases during sludge dehydration, improves the biochemical characteristics and biodegradation rate of sludge. It reduces the difference in moisture content between cathode mud and anode mud, making the moisture content of the discharged mud cake uniform. No additives are required in the treatment process, which saves costs and avoids the risk of pollution caused by additives to the final disposal.

[0045] (3) The treated sludge is safer. Ionizing radiation can kill pathogens in the remaining sludge. At the same time, ionizing radiation acts on water to produce ·OH, e aq - Activation factors such as H and H can degrade toxic organic pollutants in water, reduce the content of toxic pollutants in sludge, and effectively achieve harmless treatment of excess sludge and filtered water.

[0046] (4) High dehydration efficiency. The middle layer components in the novel sludge deep dehydration and harmless treatment system of the present application can move up and down, circulate back and forth, and can achieve simultaneous upper layer irradiation and lower layer dehydration, or lower layer irradiation and upper layer dehydration, thereby improving the treatment efficiency. Compared with the single-layer system, the double-layer system has a larger processing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1This is a schematic diagram of the structure of the ionizing radiation-electro-osmosis coupled deep dehydration and harmlessness system proposed in an embodiment of the present application, in which the middle layer component of the processing device of the system is located at the midpoint of the device;

[0048] Figure 2 A schematic structural diagram of the rising state of the intermediate layer component of the ionizing radiation-electro-osmosis coupled deep dehydration and harmlessness system proposed in an embodiment of the present application;

[0049] Figure 3 A schematic structural diagram of a lowered state of an intermediate layer component of an ionizing radiation-electro-osmosis coupled deep dehydration and harmlessness system proposed in an embodiment of the present application;

[0050] Figure 4 Schematic diagram of the front and top view of the structure of the scraper blades discharging mud of the mud discharging subsystem in the ionizing radiation-electro-osmosis coupled deep dehydration and harmless treatment system proposed in the embodiment of the present application;

[0051] In the figure: 1-mud distributor; 2-mud delivery pipeline; 3-first mud delivery port; 4-irradiation shielding shell; 5-second mud delivery port; 6-power subsystem; 7-transparent insulating cylinder; 8-irradiation source; 9-first water collecting device; 10-second water collecting device; 11-first cathode plate; 12-second cathode plate; 13-second anode plate; 14-mud scraping blade; 15-first anode plate; 16-first mud discharge port; 17-first water outlet; 18-second mud discharge port; 19-second water outlet; 20-electric wires; 21-distribution box; 22-mud discharge pipeline; 23-water outlet pipeline; 24-dewatered sludge treatment device; 25-wastewater treatment equipment; 26-motor. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] It should be noted that, in the description of the present application, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0054] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0055] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0056] In order to solve the technical problems raised in the background technology, the present application proposes an embodiment of a novel sludge deep dehydration and harmless treatment system. Specifically, Figures 1 to 3 As shown, the system includes:

[0057] Ionizing radiation-electro-osmosis coupled deep dehydration and harmless treatment device, the device comprises:

[0058] A radiation shielding shell 4 encloses a closed processing chamber;

[0059] The middle layer assembly is movably arranged in the radiation shielding shell 4 and is divided into two layers of upper and lower processing chambers;

[0060] A radiation source 8 is disposed in the upper and lower processing chambers;

[0061] A power subsystem 6, connected to the intermediate layer assembly, driving it to rise or fall to squeeze the sludge in the corresponding chamber;

[0062] The power supply subsystem is connected to the electrodes of the upper and lower processing chambers respectively to provide direct current for the electro-osmotic dehydration process;

[0063] A sludge distribution subsystem, used for providing the sludge to be treated to the treatment device;

[0064] Drainage subsystem, used to discharge treated sewage;

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

[0066] The ionizing radiation-electro-osmosis coupled deep dehydration and harmless treatment device of the present application uses an intermediate layer component to divide the treatment space into two layers, the irradiation source is placed in the treatment space, and the irradiation treatment and the electro-osmosis dehydration treatment are alternately operated in the upper and lower treatment chambers through the upper and lower movement of the intermediate layer component, and can be operated in a continuous cycle. According to the order of irradiation and cathode and anode power supply, each batch of sludge entering the treatment device can be irradiated first and then dehydrated. The operation process can be divided into two scenarios, irradiation and dehydration, which alternate with each other.

[0067] The following further describes the subsystems, devices, components and their connection relationships.

[0068] In the embodiment of the present application, the ionizing radiation-electro-osmosis coupled deep dehydration and harmless treatment device is the main part of the new sludge deep dehydration and harmless treatment system, and has the dual functions of sludge electric dehydration and radiation harmless treatment. Specifically, the treatment device includes: an irradiation shielding shell 4 for enclosing a closed treatment chamber; an intermediate layer component that is movably arranged in the irradiation shielding shell 4 and divides it into two layers of upper and lower treatment chambers; and an irradiation source 8 arranged in the upper and lower treatment chambers.

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

[0070] The middle layer assembly is arranged in the radiation shielding shell 4 and is divided into two layers of treatment chambers, the middle layer assembly is arranged to be movable up and down, so as to squeeze the sludge in the upper treatment chamber and the lower treatment chamber at different times; the middle layer assembly is provided with a first cathode plate 11, a first water collecting device 9, and a second anode plate 13 from top to bottom, and during operation, the first cathode plate 11, the first water collecting device 9, and the second anode plate 13 are fixedly connected so as to move up or down at the same time; accordingly, a first anode plate 15 is provided on the top of the upper treatment chamber; a second cathode plate 12 and a second water collecting device 10 are provided on the bottom of the lower treatment chamber from top to bottom; a filter screen is provided on the first cathode plate 11 and the second cathode plate 12 to prevent the sludge from falling, and the filter screen is 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 shapes match the cylindrical cross-sectional shape of the radiation shielding shell 4, and can usually be circular. The first anode plate 15 and the second anode plate 13 can be made of ruthenium-coated titanium plate, iridium-coated titanium plate, stainless steel plate, graphite plate, etc. The first cathode plate 11 and the second cathode plate 12 can be made of materials with good electrical conductivity such as stainless steel plate, copper plate, nickel plate, etc. In order to facilitate the removal of water, holes are arranged on the first cathode plate 11 and the second cathode plate 12, and the number and shape of the holes are not limited. In addition, a first water-blocking ring is provided on the outer edge of the intermediate layer assembly, which plays a basic water-blocking role to prevent the sewage in the upper and lower treatment chambers from communicating with each other. More specifically, the first water-blocking ring is located at the outer edge of the intermediate layer assembly, facing the inner wall of the radiation shielding shell 4. Usually, the first water-blocking ring is made of rubber material. The intermediate layer assembly is connected to the external power subsystem 6, and driven by it, it moves up or down to squeeze the sludge in the corresponding chamber.

[0071] The irradiation source 8 is used to irradiate the sludge, thereby destroying the structure of the cells in the sludge, degrading EPS to release more bound water, destroying the colloidal properties of the sludge, making the sludge easy to dehydrate and still maintaining sufficient fluidity at a lower moisture content. In an embodiment of the present application, the irradiation source 8 is disposed in a transparent insulating tube 7, which passes through the intermediate layer component from top to bottom and is located in the middle of the irradiation shielding shell 4. Correspondingly, a second water-blocking ring is provided at the place where the intermediate layer component is penetrated by the transparent insulating tube 7 (i.e., the inner edge of the through hole), which can play a basic water-blocking role and prevent the sewage in the upper and lower treatment chambers from communicating through the through hole. In other words, the second water-blocking ring is located at the inner edge of the through hole on the intermediate layer component and facing the outer wall of the transparent insulating tube 7. The irradiation source 8 can be a gamma ray, optionally 60 Co. 137 At least one of Cs.

[0072] In the embodiments of the present application, Figure 1-Figure 3 As shown, the upper and lower processing chambers are respectively provided with mud delivery ports, which are connected to the mud distribution subsystem to receive the sludge to be treated delivered by the mud distribution subsystem. Specifically, the mud distribution subsystem includes a mud distributor 1 and a mud delivery pipeline 5, the upper processing chamber is provided with a first mud delivery port 3, and the lower processing chamber is provided with a second mud delivery port 5, and the mud distributor 1 is respectively connected to the first mud delivery port 3 and the second mud delivery port 5 through the mud delivery pipeline 5, so that mud can be distributed to the upper and lower processing chambers.

[0073] In the embodiments of the present application, Figure 1-Figure 3 As shown, a scraper blade 14 is provided above the second cathode plate 12 and below the first anode plate 15, and the scraper blade 14 is connected to the motor 26. The upper and lower processing chambers are also provided with a mud discharge port, which is connected to the mud discharge subsystem. Figure 4As shown, the motor 26 drives the scraper blade 14 to rotate, and the dehydrated sludge in the upper processing chamber is scraped to the first mud discharge port 16 for discharge. Usually, the sludge is discharged to the external dehydrated sludge treatment device 24 for further treatment. Specifically, the mud discharge subsystem includes a mud discharge pipe 22 and conventional equipment such as a mud discharge pump and a conveyor belt, which will not be repeated here. Accordingly, the upper processing chamber is provided with a first mud discharge port 16, and the lower processing chamber is provided with a second mud discharge port 18. The mud discharge pipe 22 is connected to the first mud discharge port 16 and the second mud discharge port 18 respectively, so that the mud discharge function of the upper and lower processing chambers can be realized. Generally speaking, each batch of sludge in each processing chamber undergoes a treatment of first irradiation and then dehydration, and then the treated sludge (the residual sludge moisture content can be reduced to 40% to 45% by the ionizing irradiation + electro-osmosis coupling treatment device in this application) needs to be discharged, and then the next batch of sludge to be treated can be input. The number and position of the first mud discharge ports 16 should take into account the degree to which the intermediate layer assembly can rise and fall. The first mud discharge ports 16 should always be located above the first cathode plate 11 of the intermediate layer assembly, and the second mud discharge ports 18 should be located above the second cathode plate 12.

[0074] In the embodiments of the present application, Figure 1-Figure 3 As shown, the upper and lower treatment chambers are also provided with outlets respectively, which are connected to the drainage subsystem, and the sewage obtained by the electro-osmosis dehydration treatment is discharged through the drainage subsystem, usually discharged to the external sewage treatment equipment 25 for further treatment. Specifically, the drainage subsystem includes conventional equipment such as the outlet pipe 23 and the drainage pump, which will not be repeated here. Correspondingly, the first water collecting device 9 of the upper treatment chamber (i.e., the first water collecting device 9 in the middle layer assembly) is provided with a first outlet 17, and the second water collecting device 10 of the lower treatment chamber is provided with a second outlet 19. The outlet pipe 23 is connected to the first outlet 17 and the second outlet 19 respectively, so that the function of draining sewage from the upper and lower treatment chambers can be realized. The number and position of the first outlet 17 should take into account the degree to which the middle layer assembly can rise and fall. The first outlet 17 should always be located at the lower part of the first water collecting device 9 of the middle layer assembly, and the second outlet 19 should be located at the lower part of the second water collecting device 10. The interior of the first water collecting device 9 and the second water collecting device 10 can be arranged horizontally, and the sewage in the final treatment chamber is pumped out by a drainage pump (self-priming pump).

[0075] In the embodiments of the present application, Figure 1-Figure 3 As shown, the middle layer component should also be connected to the power subsystem 6, through which the middle layer component can be raised and lowered, thereby squeezing the sewage in the upper treatment chamber and the lower treatment chamber respectively.

[0076] In the embodiments of the present application, Figure 1-Figure 3As shown, the sludge deep dehydration and harmless treatment system also includes a power supply subsystem, which is respectively connected to the electrodes of the upper and lower treatment chambers to provide power for the electro-osmosis dehydration treatment in the treatment chambers (for example, providing direct current); usually, the power supply subsystem 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 through the wire 20, and is also connected to the second cathode plate 12 and the second anode plate 13 of the lower treatment chamber through the wire 20. During operation, the middle layer assembly rises, and when the upper layer of sludge is squeezed and in close contact with the first anode plate 15 (i.e., the anode plate, sludge and cathode plate are in close contact), the distribution box 21 is turned on to supply direct current to the first anode plate 15 and the first cathode plate 11, and the electro-osmotic dehydration process of the upper layer of sludge begins; when the middle layer assembly descends, and the lower layer of sludge is squeezed until it is in close contact with the second anode plate 13 and the second cathode plate 12 respectively (i.e., the anode plate, sludge and cathode plate are in close contact), the distribution box 21 is turned on to supply direct current to the second anode plate 13 and the second cathode plate 12, and the electro-osmotic dehydration process of the lower layer of sludge begins.

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

[0078] The novel sludge deep dehydration and harmless treatment method is performed by the novel sludge deep dehydration and harmless treatment system of the above embodiment, and comprises the following steps:

[0079] S100, adjust the middle layer component of the treatment device to the middle position (i.e., divide the treatment chamber into two upper and lower treatment chambers with basically equal volumes), inject the sludge to be treated into the upper and lower treatment chambers at the same time through the mud distribution subsystem, and close the mud delivery port after the mud injection is completed; start the irradiation device (for example, move the lead cover shielding the radiation source 8), and turn on the radiation source 8 for irradiation treatment.

[0080] Specifically, in this step, the mud spreader 1 is used to spread the mud, that is, the sludge is injected into the filter cloths of the first cathode plate 11 and the second cathode plate 12 through the mud delivery pipe 2 through the first mud delivery port 3 and the second mud delivery port 5 respectively. After the mud injection is completed, the mud delivery ports on the radiation shielding shell 4 are closed; the irradiation device is started (for example, the lead cover shielding the radiation source 8 is moved away), and the radiation source 8 is turned on for irradiation treatment.

[0081] S200, the power subsystem 6 drives the middle layer component to rise, and squeezes the sludge to be treated in the upper treatment chamber upward until it is in close contact with the first anode plate 15, the first cathode plate 11 and the sludge respectively. The power supply subsystem supplies direct current to the first anode plate 15 and the first cathode plate 11, and the electro-osmosis dehydration treatment starts. The removed sewage 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 therein.

[0082] Specifically, in this step, first, the power subsystem 6 applies an upward pressure to the middle layer component, and the pressure value is set to 2 bar, for example, and the middle layer component rises (such as Figure 2 As shown). When the upper sludge is squeezed and in close contact with the first anode plate 15, the 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 to enter the electrical dehydration process. The removed water falls into the first water collecting device 9 through the holes on the first cathode plate 11, and then flows into the outlet pipe 23 through the first outlet 17, and then enters the external sewage treatment equipment 25 for treatment. While the middle layer assembly moves upward to electrically dehydrate the upper sludge, the irradiation source 8 is exposed in the lower treatment chamber, and the lower sludge is irradiated through the transparent insulating cylinder 7 to destroy the EPS of the sludge. After the electrical dehydration of the upper sludge is completed, the scraper blade 14 is driven by the motor 26 to work, and the dehydrated sludge enters the sludge discharge pipe 22 through the first sludge discharge pipe 16, and then enters the dehydrated 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 power subsystem 6 drives the middle layer component to descend, and at the same time, the mud distribution subsystem injects the sludge to be treated into the upper treatment chamber, and the middle layer component continues to descend and squeezes the sludge to be treated in the lower treatment chamber downward until it is in close contact with the second anode plate 13, the second cathode plate 12 and the sludge respectively. The power supply subsystem supplies direct current to the second anode plate 13 and the second cathode plate 12, and the electro-osmosis dehydration treatment is started. The removed sewage is discharged through the drainage subsystem, and the treated sludge is discharged through the mud discharge subsystem; at the same time, the irradiation source 8 is exposed in the upper treatment chamber to irradiate the sludge to be treated therein.

[0084] Specifically, in this step, the middle layer component begins to move downward under the action of the power subsystem 6 (eg Figure 3As shown), the pressure value is set to 2 bar, for example. When the middle layer component descends, the mud distributor 1 delivers new sludge to be treated to the filter cloth of the upper first cathode plate 11 through the mud delivery pipe 2 and the first mud delivery port 3. After the middle layer structure descends past the midpoint of the device, the irradiation source 8 is exposed in the upper treatment chamber, and the upper new mud is irradiated to destroy the sludge EPS. The middle layer component continues to descend under the action of the power subsystem 6, squeezing the sludge to be treated in the lower treatment chamber downward until it is in close contact with the second anode plate 13 and the second cathode plate 12 respectively, and then the distribution box 21 is turned on to supply direct current to the second anode plate 13 and the second cathode plate 12, and the electrical dehydration process of the lower sludge is started. The removed water falls into the second water collection device 10 through the holes on the second cathode plate 12, and then flows into the outlet pipe 23 through the second outlet 19, and then enters the sewage treatment equipment 25 for treatment. After the lower layer of sludge is electrically dehydrated, it enters the sludge discharge pipe 22 through the second sludge discharge port 18, and then enters the dehydrated sludge treatment device 24 for treatment. At the same time, the irradiation process of the upper layer of sludge is also completed.

[0085] S400, the power subsystem 6 drives the middle layer assembly to rise, and at the same time the mud distribution subsystem injects the sludge to be treated into the lower layer treatment chamber to complete the same treatment as in step S200; thereby, the treatment of step S200 and step S300 is cyclically executed to achieve efficient dehydration and harmless treatment of the upper layer irradiation and the lower layer dehydration, or the lower layer irradiation and the upper layer dehydration at the same time.

[0086] Specifically, in this step, the middle layer component begins to move upward under the action of the power subsystem 6 (eg Figure 2 As shown). The second mud delivery port 5 is opened, and the mud distributor 1 injects new sludge to be treated onto the filter cloth on the second cathode plate 12 through the mud delivery pipe 2. When the middle layer assembly continues to rise, so that the upper layer of sludge is squeezed and in close contact with the first anode plate 15, the distribution box 21 is turned on to supply direct current to the first anode plate 15 and the first cathode plate 11, and the upper layer of sludge begins to enter the electrical dehydration process. The removed water falls into the first water collecting device 9 through the holes on the first cathode plate 11, and then flows into the outlet pipe 23 through the first outlet 17, and then enters the external sewage treatment equipment 25 for treatment. While the middle layer assembly moves upward to electrically dehydrate the upper layer of sludge, the irradiation source 8 is exposed in the lower processing chamber, and the lower layer of sludge is irradiated through the transparent insulating cylinder 7 to destroy the EPS of the sludge. After the upper layer of sludge is electrically dehydrated, it enters the sludge discharge pipe 22 through the first mud discharge pipe 16, and then enters the dehydrated sludge treatment device 24 for treatment. After the upper sludge is discharged, the irradiation process of the lower sludge is also completed. Thus, the cycle is repeated to achieve efficient dehydration treatment of irradiating the upper layer and dehydrating the lower layer, or irradiating the lower layer and dehydrating the upper layer at the same time.

[0087] The moisture content of the dehydrated sludge obtained by the novel sludge deep dehydration and harmlessness treatment method in the embodiment of the present application is about 40%-45%, and the treatment is performed uninterruptedly, which can achieve more efficient dehydration.

[0088] Test example

[0089] This test example describes a comparative experiment of two processes: electroosmosis dehydration treatment alone and ionizing radiation + electroosmosis dehydration coupling treatment. The activated sludge was taken from a sewage treatment plant in Tianjin. The basic parameters are shown in Table 1. 60 Co is used as an irradiation source, and its radioactivity is 7.4×10 14 Bq, dose rate 190Gy / min.

[0090] Table 1 Basic physical and chemical 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 harmless treatment system of the embodiment of the present application adopts direct current. In the treatment device, the radiation shielding shell 4 is a cylindrical cylinder, with an outer lead shell and an inner polytetrafluoroethylene material, an inner diameter of 50 cm and a height of 40 cm. A radiation source 8 (radiation source) is arranged in the middle of the device. 60 Co). The first anode plate 15 and the second anode plate 13 above the device are both circular and made of ruthenium-coated titanium plates. The first cathode plate 11 and the second cathode plate 12 below are also circular and have holes distributed thereon. They are made of stainless steel plates (4 mm thick and 2 mm in diameter). Stainless steel filter cloths with a thickness of 40 μm and a hole diameter of 44 μm are placed on the first cathode plate 11 and the second cathode plate 12, respectively. The first water collection device 9 and the second water collection device 10 arranged 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 collecting device 9 and the second water collecting device 10 are common discs, and the inner bottom surfaces thereof are slightly inclined.

[0094] During the experiment, 145 drainage holes with a diameter of 2 mm were punched on the first cathode plate 11 and the second cathode plate 12 respectively, so as to timely discharge the removed water. A filter cloth with a pore size of 44 μm was placed on the first cathode plate 11 and the second cathode plate 12 to intercept sludge particles. The filtrate during the experiment flowed out through the outlet pipe 23.

[0095] When the irradiation source 8 (γ-ray) is turned off, the water content of the sludge can be reduced to 55-65% after the device performs electro-osmotic dehydration for 20 minutes. When the device is operating normally and the irradiation source 8 (γ-ray) is turned on, the water content of the sludge after electro-dehydration can be reduced to 40-45%. At the same time, the difference in water content between the anode mud and the cathode mud of the sludge treated by the coupling of γ-ray + electro-osmotic dehydration is small. When electro-osmotic dehydration is performed alone, the water content of the anode mud is about 50-55%, and the cathode is about 65-70%. In the coupling process, the anode mud is about 38-43%, and the cathode mud is about 45-49%. The sludge floc structure and biological cells treated by γ-ray irradiation are significantly damaged. The outflow of EPS and cell contents increases the content of soluble organic components in the sludge and improves the biodegradability of the sludge. At the same time, the destruction of the cell wall (membrane) can release more bound water, thereby improving the dehydration performance of the sludge in the subsequent electro-dehydration process. The dehydration device can change the main functional groups of EPS that can be extracted in the sludge, such as protein and polysaccharide groups, so that the sludge changes in a direction that is conducive to treatment and disposal.

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

Claims

1. An ionizing radiation-electro-osmosis coupled sludge deep dehydration and harmless treatment device, characterized in that: include: A radiation shielding shell (4) encloses a closed processing chamber; An intermediate layer component is movably arranged in the radiation shielding shell (4) up and down, and is divided into two layers of upper and lower processing chambers; A radiation source (8) disposed in the upper and lower processing chambers; The middle layer component is provided with a first cathode plate (11), a first water collecting device (9), and a second anode plate (13) in sequence from top to bottom; the top of the upper layer processing chamber is provided with a first anode plate (15); the bottom of the lower layer processing chamber is provided with a second cathode plate (12) and a second water collecting device (10) in sequence from top to bottom; the first cathode plate (11) and the second cathode plate (12) both have holes and are provided with filter screens.

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

3. The sludge deep dehydration and harmless treatment device according to claim 1 or 2, characterized in that: The radiation source (8) is arranged in the transparent insulating tube (7), and the transparent insulating tube (7) passes through the intermediate layer component from top to bottom and is vertically arranged in the middle of the radiation shielding shell (4); a second water-blocking ring is arranged at the position where the intermediate layer component is penetrated by the transparent insulating tube (7).

4. The sludge deep dehydration and harmless treatment device according to any one of claims 1 to 3, characterized in that: The irradiation source (8) is a γ-ray irradiation source; more preferably, the γ-ray irradiation source is selected from 60 Co. 137 At least one of Cs.

5. The sludge deep dehydration and harmless treatment device according to any one of claims 1 to 4, characterized in that: Mud scraping blades (14) are respectively arranged above the second cathode plate (12) and below the first anode plate (15); the mud scraping blades (14) are respectively connected to motors (26) and are used to transport the dehydrated sludge to the mud discharge ports of the upper and lower processing chambers.

6. The sludge deep dehydration and harmless treatment device according to any one of claims 1 to 5, characterized in that: The radiation shielding shell (4) is a shell made of lead material on the outside and polytetrafluoroethylene material on the inside; Optionally, the filter is made of stainless steel or nylon; Optionally, 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; Optionally, the first cathode plate (11) and the second cathode plate (12) are made of any one of a stainless steel plate, a copper plate and a nickel plate.

7. A sludge deep dehydration and harmless system, characterized in that: include: The processing device according to any one of claims 1 to 6; A power subsystem connected to the middle layer assembly to drive it to rise or fall to squeeze the sludge in the corresponding chamber; The power supply subsystem is connected to the electrodes of the upper and lower processing chambers respectively to provide direct current for the electro-osmotic dehydration process; A sludge distribution subsystem, used for providing the sludge to be treated to the treatment device; Drainage subsystem, used to discharge treated sewage; The sludge discharge subsystem is used to discharge the treated sludge.

8. The sludge deep dehydration and harmless treatment system according to claim 7, characterized in that: The mud distribution subsystem comprises a mud distributor (1) and a mud delivery pipeline (5); the upper processing chamber is provided with a first mud delivery port (3), the lower processing chamber is provided with a second mud delivery port (5), and the mud distributor (1) is connected to the first mud delivery port (3) and the second mud delivery port (5) respectively through the mud delivery pipeline (5); Optionally, the mud discharge subsystem comprises a mud discharge pipe (22) and a mud discharge pump, the upper processing chamber is provided with a first mud discharge port (16), the lower processing chamber is provided with a second mud discharge port (18), and the mud discharge pipe (22) is connected to the first mud discharge port (16) and the second mud discharge port (18) respectively; Optionally, the drainage subsystem comprises a water outlet pipe (23) and a drainage pump, a first water outlet (17) is provided on the first water collecting device (9) of the upper processing chamber, a second water outlet (19) is provided on the second water collecting device (10) of the lower processing chamber, and the water outlet pipe (23) is connected to the first water outlet (17) and the second water outlet (19) respectively; Optionally, the power supply subsystem includes a distribution box (21), which is connected to a first cathode plate (11) and a first anode plate (15) of an upper processing chamber via an electric wire (20), and is also connected to a second cathode plate (12) and a second anode plate (13) of a lower processing chamber via an electric wire (20).

9. A method for deep dehydration and harmlessness of sludge, characterized in that: The sludge deep dehydration and harmless treatment system as described in claim 7 or 8 can realize simultaneous upper layer irradiation and lower layer dehydration, or lower layer irradiation and upper layer dehydration.

10. The method for deep dehydration and harmlessness of sludge according to claim 9, characterized in that: The steps include: S100, adjusting the middle layer assembly to the middle position, injecting the sludge to be treated into the upper and lower layer treatment chambers simultaneously through the sludge distribution subsystem, and closing the sludge delivery port after the sludge injection is completed; turning on the irradiation source (8) to perform irradiation treatment; S200, the power subsystem drives the middle layer assembly to rise, and squeezes the sludge to be treated in the upper treatment chamber upward until it is in close contact with the first anode plate (15), the first cathode plate (11) and the sludge respectively, and the power supply subsystem supplies direct current to the first anode plate (15) and the first cathode plate (11), and starts the electro-osmosis dehydration treatment, and the removed sewage 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 therein; S300, the power subsystem drives the middle layer component to descend, and at the same time, the mud distribution subsystem injects the sludge to be treated into the upper treatment chamber, and the middle layer component continues to descend and squeezes the sludge to be treated in the lower treatment chamber downward until it is in close contact with the second anode plate (13), the second cathode plate (12) and the sludge respectively, and the power supply subsystem supplies direct current to the second anode plate (13) and the second cathode plate (12), and starts the electro-osmosis dehydration treatment, and the removed sewage is discharged through the drainage subsystem, and the treated sludge is discharged through the mud discharge subsystem; at the same time, the irradiation source (8) is exposed in the upper treatment chamber to irradiate the sludge to be treated therein; S400, the power subsystem drives the middle layer assembly to rise, and at the same time the mud distribution subsystem injects the sludge to be treated into the lower layer treatment chamber, completing the same treatment as in step S200; Thus, the processing of step S200 and step S300 is executed in a loop.

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