A sludge resource utilization treatment equipment and process

Abstract

This invention relates to a sludge resource utilization treatment equipment and process, comprising: an alkaline thermal treatment device, a hydrolysis digestion device, a sedimentation device, and a vertical flow reactor connected in sequence; the alkaline thermal treatment device is used to introduce sludge for heating and alkalization treatment; the hydrolysis digestion device is used to receive the heated and alkalized sludge for hydrolysis digestion; the sedimentation device is used to receive the hydrolyzed and digested sludge for sedimentation; the sediment is stored, and the supernatant is introduced into the vertical flow reactor; the vertical flow reactor is used to remove ammonia nitrogen from the supernatant and discharge purified water. Based on the treatment and utilization of sludge, methane recovery and utilization are achieved, air pollution is reduced, and resource utilization is maximized while losses are minimized.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a sludge resource utilization treatment equipment and process. Background Technology

[0002] Activated sludge (WAS) is a core technology for urban wastewater treatment, making a crucial contribution to addressing water pollution problems caused by rapid urban population growth and industrialization. However, the cost of treating and disposing of waste sludge during the activated sludge process accounts for approximately 30-60% of the total cost of urban wastewater treatment plants, placing a significant financial burden on their operation. Waste sludge contains a large amount of organic matter (proteins, carbohydrates, and fats, etc.) that can be used as valuable resources. Compared to traditional treatment strategies (such as incineration and landfill), anaerobic digestion (AD) can simultaneously achieve waste sludge stabilization, energy recovery, and resource utilization. Anaerobic digestion includes hydrolysis, acidification, acetogenesis, and methanogenesis. Through biological metabolism, the organic matter in WAS can be effectively converted into valuable biological products such as volatile fatty acids (VFAs), methane (CH4), and hydrogen (H2). However, WAS flocs are composed of microbial cells and extracellular polymeric substances (EPS). EPS mainly consists of proteins, humic substances, and small amounts of polysaccharides. EPS reduces the release of organic matter and the efficiency of corresponding enzymes, thus inhibiting the efficiency of anaerobic digestion. Meanwhile, during anaerobic digestion of sludge, the degradation of proteins (which account for more than 50% of the organic matter in sludge) leads to a sharp increase in ammonia nitrogen concentration in the digestate, resulting in a C / N ratio of approximately 6 to 9, far lower than the required 25 for anaerobic digestion. This limits the efficiency of anaerobic digestion and leads to poor sludge resource recovery and volume reduction. Furthermore, the high concentration of ammonia nitrogen in the digestate will significantly impact subsequent wastewater treatment systems.

[0003] In the field of advanced nitrogen removal from wastewater, anammox technology is gradually becoming a strong competitor to traditional nitrification-denitrification processes due to its superior nitrogen removal performance, significantly improved energy efficiency, and environmental advantages such as low sludge production. However, the long doubling cycle of Anammox bacteria (up to 11 days) and their sensitivity to environmental factors (oxygen, organic matter concentration, etc.) result in long reactor start-up periods and poor operational stability. The addition of functional granular sludge for anammox can effectively achieve rapid start-up of the anammox system.

[0004] Therefore, how to efficiently achieve anaerobic digestion of excess sludge while utilizing digestion liquid containing high ammonia nitrogen to extract anaerobic ammonia oxidation granular sludge is a new approach to sludge resource utilization and volume reduction, and also a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To solve at least one of the above-mentioned technical problems, the present invention provides a sludge resource utilization treatment device, comprising: an alkaline heat treatment device, a hydrolysis digestion device, a sedimentation device, and a vertical flow reactor connected in sequence;

[0006] Alkali heat treatment device is used to introduce sludge and perform heating and alkalization treatment;

[0007] The hydrolysis and digestion device is used to receive sludge after heating and alkalization, and to perform hydrolysis and digestion.

[0008] The sedimentation unit is used to receive the sludge after hydrolysis and digestion, and to settle it; the precipitate is stored, and the supernatant is introduced into the vertical flow reactor;

[0009] A vertical flow reactor is used to remove ammonia nitrogen from the supernatant and discharge purified water.

[0010] Furthermore, the alkaline heat treatment apparatus includes:

[0011] The heating element is located in the middle of the alkaline heat treatment device;

[0012] The alkali feeding assembly is located at the top of the alkali heat treatment device;

[0013] The stirring assembly is located at the bottom of the alkali heat treatment device;

[0014] The first sludge inlet pipe and the first sludge outlet pipe are respectively connected to the sludge storage tank and the hydrolysis digestion device;

[0015] In addition, there are temperature measuring components and pH measuring components.

[0016] Furthermore, the hydrolysis digestion apparatus includes:

[0017] A stirring component located at the bottom;

[0018] An activated carbon dosing assembly is located on one side of the top, and a methane gas collection assembly is located on the other side of the top.

[0019] And the second mud inlet pipe and the second mud outlet pipe are set on both sides.

[0020] Furthermore, the precipitation apparatus includes:

[0021] The third mud outlet pipe is located at the bottom, and the third mud inlet pipe and the supernatant outlet pipe are located at the top.

[0022] The third mud discharge pipe is connected to the main mud discharge port;

[0023] The third mud inlet pipe is connected to the second mud outlet pipe of the hydrolysis and digestion unit.

[0024] The supernatant outlet pipe is connected to the inlet water of the vertical flow reactor.

[0025] Furthermore, it also includes a cyclone screen guide device, one end of which is connected to the bottom of the vertical flow reactor and the other end of which is connected to the alkali heat treatment device, used to guide the target particle size sludge from the vertical flow reactor into the alkali heat treatment device.

[0026] Furthermore, the cyclone screen guide device includes a frame, a rotating assembly, a screen assembly, and a guide assembly;

[0027] The shell is closed on the sides and has a through hole in the center that connects to the axial bottom of the vertical flow reactor;

[0028] A rotating component is rotatably mounted inside the through hole;

[0029] The screen assembly is set inside the through hole, and its outer edge is connected to the inner wall of the shell frame;

[0030] The guide assembly is located on one side of the shell and communicates with the through hole.

[0031] Furthermore, the rotating assembly includes a rotating spindle, rotating blades mounted on the rotating spindle, and a rotating drive connected to the rotating spindle, for forming a stable outward swirling flow inside the through hole;

[0032] The screen assembly includes: a first screen disposed above the through hole, and a second screen disposed below the through hole; the mesh diameter of the first screen is smaller than that of the second screen.

[0033] Furthermore, the guide assembly includes at least one guide pipe;

[0034] The drainage pipe is arranged at an upward angle relative to the horizontal plane, with the first end connected to the through hole and the second end connected to the outside. The diameter of the drainage pipe gradually decreases from the inlet to the outlet along the direction of sewage flow, forming a tapering structure.

[0035] Furthermore, the drainage pipes consist of several sections;

[0036] They are circumferentially spaced at the same height on the shell and tangentially distributed along the direction of the swirling flow of wastewater on the shell.

[0037] The inlets of each guide pipe are located at the same horizontal height inside the shell.

[0038] On the other hand, the present invention also provides a sludge resource utilization treatment process, employing any of the above-mentioned sludge resource utilization treatment equipment, including:

[0039] The sludge is introduced into the alkali heat treatment device, heated to 60-80℃, and alkaline substances are added through the alkali feeding component to raise the initial pH value to 11-12. The mixture is stirred for 1-3 hours.

[0040] Then, the mixture is introduced into a hydrolysis digestion device, and activated carbon is added at a dosage of 0.5-1.5 g / g VSS for anaerobic digestion. The mixture is stirred for 4-8 days to recover methane.

[0041] Then, the sludge is introduced into a sedimentation device and allowed to settle for 1-2 hours. The settled sludge is then discharged, and the supernatant is introduced into a vertical flow reactor.

[0042] After removing ammonia nitrogen, the vertical flow reactor discharges qualified clean water, completing the resource utilization treatment of sludge.

[0043] This invention provides a sludge resource utilization treatment device and process. First, the sludge is heated and alkalized through alkaline heat treatment to release organic matter and promote sludge volume reduction. Then, anaerobic digestion is performed through hydrolysis, recovering methane while simultaneously introducing the remaining sludge into a sedimentation device for storage. The precipitate can be used in a sludge utilization device for other purposes. The supernatant is introduced into a vertical flow reactor to remove ammonia nitrogen before being discharged as clean water, thus avoiding air pollution during the sludge resource utilization process. Therefore, this sludge resource utilization treatment device, while treating and utilizing sludge, achieves methane recovery and utilization, and also reduces air pollution, maximizing resource utilization and minimizing losses. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort. In the drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0045] Figure 1 This is a schematic diagram of a structure of an embodiment of the sludge resource utilization treatment equipment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of an embodiment of the alkaline heat treatment device of the sludge resource utilization equipment of the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of a hydrolysis and digestion device of the sludge resource utilization equipment of the present invention;

[0048] Figure 4 This is a schematic diagram of the sedimentation device of the sludge resource utilization equipment of the present invention;

[0049] Figure 5 This is a schematic diagram of the structure of a vertical flow reactor in one embodiment of the sludge resource utilization treatment equipment of the present invention;

[0050] Figure 6 This is a front view schematic diagram of an embodiment of the cyclone screen guide device of the sludge resource utilization equipment of the present invention;

[0051] Figure 7 This is a top view schematic diagram of an embodiment of the cyclone screen guiding device of the vertical flow reactor in the sludge resource utilization equipment of the present invention. Detailed Implementation

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

[0053] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0054] It should also be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, back, etc., these directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. Furthermore, if the embodiments of the present invention involve descriptions such as "first," "second," "S1," "S2," "step one," "step two," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance, or implicitly indicating the number of technical features indicated or the order of method execution. Those skilled in the art will understand that anything that does not violate the inventive concept and does not contradict the inventive points should be included within the scope of protection of the present invention.

[0055] like Figure 1 As shown, the present invention provides a sludge resource utilization treatment device, comprising an alkaline heat treatment device 1, a hydrolysis digestion device 2, a sedimentation device 3, and a vertical flow reactor 4 connected in sequence;

[0056] Alkali heat treatment device is used to introduce sludge and perform heating and alkalization treatment;

[0057] The hydrolysis and digestion unit is used to receive heated and alkalized sludge, perform hydrolysis and digestion, and recover methane.

[0058] The sedimentation unit is used to receive the sludge after hydrolysis and digestion, and to settle it; the precipitate is stored, and the supernatant is introduced into the vertical flow reactor;

[0059] A vertical flow reactor is used to remove ammonia nitrogen from the supernatant and discharge purified water.

[0060] This embodiment presents a sludge resource utilization treatment device of the present invention. First, the sludge is heated and alkalized through alkaline thermal treatment to release organic matter and promote sludge volume reduction. Then, anaerobic digestion is performed through hydrolysis to recover methane. The remaining sludge is then introduced into a sedimentation device to store the precipitate, which can be used in a sludge utilization device for other purposes. The supernatant is introduced into a vertical flow reactor to remove ammonia nitrogen before being discharged as clean water, thus avoiding air pollution during the sludge resource utilization process. Therefore, this sludge resource utilization treatment device, while treating and utilizing sludge, achieves methane recovery and utilization, and also reduces air pollution, maximizing resource utilization and minimizing losses.

[0061] Preferred, such as Figure 2 As shown, the alkaline heat treatment apparatus 1 includes:

[0062] Heating component 11 is located in the middle of the alkaline heat treatment device;

[0063] Alkali feeding assembly 12 is installed at the top of the alkali heat treatment device;

[0064] The stirring component 13 is located at the bottom of the alkali heat treatment device;

[0065] The first sludge inlet pipe 14 and the first sludge outlet pipe 15 are respectively connected to the sludge introduction unit and the hydrolysis digestion device.

[0066] And temperature measuring component 16 and pH measuring component 17.

[0067] Preferably, hot water is provided by an external heating component 11 to indirectly heat the sludge in the alkaline heat treatment device at a temperature of 60-80℃; simultaneously, alkaline substances are added through an alkaline feeding component to raise the initial pH value to 11-12, with a residence time of 1-3 hours. Preferably, the operating steps include: heating to 70℃ using an intelligent temperature control device, then precisely adding sodium hydroxide using an intelligent pH control system to bring the pH to 11-12, with an alkaline heat treatment time of 1-2 hours. Alkaline heat treatment of sludge enhances sludge hydrolysis, promotes the breakdown of sludge flocs, releases organic matter, and promotes sludge volume reduction.

[0068] Preferred, such as Figure 3 As shown, the hydrolysis and digestion device 2 includes:

[0069] The stirring component 21 is located at the bottom;

[0070] An activated carbon dosing assembly 22 is installed on one side of the top and a methane gas collection assembly 23 is installed on the other side of the top;

[0071] And the second mud inlet pipe 24 and the second mud outlet pipe 25 are set on both sides.

[0072] Preferably, the sludge after alkaline heat treatment is introduced into a hydrolysis digestion unit, with activated carbon added while stirring at a rate of approximately 0.5-1.5 g / gVSS. Anaerobic digestion is then carried out in the hydrolysis digestion unit, during which methane is recovered for external use. During this process, a large amount of ammonia nitrogen is released due to the degradation of proteins and other components in the sludge. More preferably, the residence time of the sludge in this hydrolysis digestion unit is 4-8 days, preferably 6 days.

[0073] like Figure 4 As shown, the sedimentation device 3 can be a gravity sedimentation tank of the prior art, including a third sludge outlet pipe 31 set at the bottom, a third sludge inlet pipe 32 set at the top, and a supernatant outlet pipe 33.

[0074] The third mud discharge pipe is connected to the main mud discharge port;

[0075] The third mud inlet pipe is connected to the second mud outlet pipe of the hydrolysis and digestion unit.

[0076] The supernatant outlet pipe 33 is connected to the inlet water of the vertical flow reactor.

[0077] In this embodiment, a preferred embodiment of the sedimentation device is provided. The sludge-water mixture introduced from the hydrolysis and digestion device undergoes solid-liquid separation, and the settled sludge is discharged, optionally into a sludge utilization device for use as fertilizer. The supernatant is introduced into a vertical flow reactor. Since the supernatant contains a large amount of ammonia nitrogen, this portion requires further removal of ammonia nitrogen using a vertical flow reactor. More preferably, the sedimentation time is 2 hours.

[0078] More preferably, such as Figure 5 As shown, the vertical flow reactor 4 includes: an inner cylinder, an outer cylinder, a flow guiding device, and an aeration device; the inner cylinder and the outer cylinder are connected and separated into an inner reaction chamber located inside the inner cylinder and an outer reaction chamber located between the inner cylinder and the outer cylinder; the flow guiding device is connected to the axial bottom end of the inner cylinder and includes: an inner inclined flow guiding part, an outer inclined flow guiding part, a sieve hole provided on the side wall of the inner inclined flow guiding part, and a through hole penetrating the flow guiding assembly; the aeration device is installed inside the flow guiding device.

[0079] More preferably, the sludge resource utilization treatment equipment also includes a cyclone screen guide device 5, one end of which is connected to the bottom end of the vertical flow reactor and the other end of which is connected to the alkaline heat treatment device, including a shell frame 51, a rotating component 52, a screen assembly 53 and a guide assembly 54.

[0080] The shell frame is closed on the sides and has a through hole 55 in the center; during use, the through hole is connected to the bottom of the vertical flow reactor, preferably to the bottom of the flow guiding device;

[0081] A rotating component is rotatably mounted inside the through hole;

[0082] The screen assembly is set inside the through hole, and its outer edge is connected to the inner wall of the shell frame;

[0083] The guide assembly is located on one side of the shell and communicates with the through hole.

[0084] In this embodiment, the structure and operation of the cyclone screen guiding device are as follows: the sludge mixture enters the device from the bottom of the through hole. Different types of granular sludge are subjected to the combined effects of gravity, fluid shear force generated by the rotation of the rotating component, and cyclone induction force, and are diverted to three different directions. Specifically: due to the difference in particle composition, sludge containing more inorganic components (such as hydroxyapatite) has relatively large particle size and density, and is prone to gravity settling at the bottom of the device, and is directly discharged from the sludge discharge port; while granular sludge containing more functional microorganisms has a lower density, rises with the main liquid flow and enters the screening section—the cyclone screen guiding device. On the one hand, granular sludge with a particle size smaller than the first set threshold (small particle size, low density, light weight, and moving upward with the rising flow) directly passes through the screen component and participates in the internal circulation; on the other hand, granular sludge with a medium particle size is blocked. At this time, the rotating component rotates at high speed, forming a stable cyclone inside the through hole. The particles in the cyclone field are subjected to centrifugal forces of different intensities due to differences in particle size and density. Granular sludge of the target particle size is thrown against the side wall of the device under centrifugal force and smoothly introduced into the connected guide assembly, thereby achieving efficient separation and directional collection of particles. This device integrates gravity sedimentation, screen classification, and cyclone centrifugation, which can accurately screen out granular sludge of suitable particle size and rich in functional microorganisms, taking into account both sludge structural stability and microbial activity, effectively improving system operating efficiency and sludge resource utilization level, and significantly reducing subsequent treatment load and overall operating costs.

[0085] More preferably, the rotating assembly includes a rotating spindle, rotating blades mounted on the spindle, and an external rotating drive for forming a stable outward vortex inside the through hole.

[0086] In this embodiment, the rotary drive generates rotational power and outputs it to the rotary spindle, which further drives the rotary blades mounted thereon. This causes the rising liquid flow to swirl under the drive of the rotary blades. Different particle sizes of sludge are subjected to different centrifugal forces under the action of the swirling flow, and thus occupy different positions within different through-holes, achieving further screening of the different granular sludge particles. Specifically, larger particle sizes and higher densities of granular sludge are located in the outer layer of the through-holes, while larger particle sizes and lower densities of granular sludge are located in the inner layer of the through-holes.

[0087] Optionally, the rotary drive component is a waterproof motor to meet the requirements of wet conditions; more preferably, the rotary drive component is a waterproof servo motor to meet various speed change requirements and realize the function of quickly adjusting the flow rate of the vortex.

[0088] The rotary drive generates rotational power and outputs it to the rotating main shaft, which further drives the rotating blades mounted on it. This causes the rising liquid flow to swirl under the drive of the rotating blades. Different particle sizes of sludge are subjected to different centrifugal forces under the action of the swirling flow, and thus occupy different positions within the first through-hole, achieving further screening of different pairs of sludge particles. Specifically, larger, denser sludge particles are located in the outer layer of the first through-hole, while larger, less dense sludge particles are located in the inner layer. More preferably, the rotating blades are wider at the top and narrower at the bottom, and are inclined, which can create a better fluid guiding effect during rotation, generating a more stable swirling flow and achieving a better screening effect. Optionally, the rotary drive is a waterproof motor to meet the requirements of wet conditions; more preferably, the rotary drive is a waterproof servo motor to meet various speed change requirements and achieve the function of quickly adjusting the size of the swirling flow.

[0089] More preferably, the rotating blades are provided with a biomimetic antifouling coating to improve the structural strength of the rotating blades while reducing sludge adhesion. The biomimetic antifouling coating includes: a base layer, a functional layer, and an antibacterial layer connected sequentially from the inside out;

[0090] The base layer is a titanium alloy substrate treated with micro-arc oxidation.

[0091] The functional layer is a composite layer of graphene and polytetrafluoroethylene, with shark skin-inspired microgrooves constructed on its surface.

[0092] The antibacterial layer is made of silver-loaded mesoporous silica nanoparticles.

[0093] The base layer utilizes a titanium alloy substrate treated with micro-arc oxidation, which enhances the structural strength of the rotating blades and improves their corrosion resistance, thus extending their service life. The functional layer employs a graphene and polytetrafluoroethylene (PTFE) composite layer with shark-skin-inspired microgrooves on its surface. The synergistic effect of graphene and PTFE reduces sludge adhesion, while the shark-skin-inspired microgrooves reduce the coefficient of frictional resistance in fluid turbulence, significantly reducing the drag on the rotating blades. The antibacterial layer uses silver-loaded mesoporous silica nanoparticles, which, through the slow release of silver ions, disrupt bacterial quorum sensing and reduce microbial adhesion. This biomimetic antifouling coating, utilizing mechanical reinforcement, fluid optimization, and bio-inhibition, significantly improves the service life of the rotating components and enhances the maintainability of the device.

[0094] Preferably, the screen assembly 53 includes: a first screen 53a disposed above the through hole 55, and a second screen 53b disposed below the through hole 55; the mesh diameter of the first screen 53a is smaller than the mesh diameter of the second screen 53b. The mesh diameter of the first screen corresponds to a first set threshold, used to screen granular sludge with a particle size smaller than the first set threshold through the screening upstream; the mesh diameter of the second screen corresponds to a second set threshold, used to screen granular sludge with a particle size larger than the second set threshold through the sludge discharge port. Granular sludge with a target particle size between the first and second set thresholds is retained and introduced into a reflux device for recycling, achieving efficient sorting and targeted utilization of granular sludge of different particle sizes, thereby screening out matured granular sludge with a suitable particle size range for better screening results. For example, the first screen has a mesh size of 5 mm and the second screen has a mesh size of 3 mm, which initially separates the target sludge particles with a diameter of 3 to 5 mm, thereby improving the screening efficiency of the subsequent rotating components.

[0095] More preferably, the guide assembly 54 includes at least one guide tube 541;

[0096] The guide pipe is arranged at an upward angle relative to the horizontal plane, with the first end connected to the through hole and the second end connected to the outside.

[0097] The diameter of the drainage pipe gradually decreases from the inlet to the outlet along the direction of sewage flow, forming a tapering structure.

[0098] In this embodiment, the structure of the drainage component is further defined, deviating from conventional technical choices: the drainage pipe is arranged at an angle, so that when the granular sludge rises along the pipe wall, the denser particles are more significantly affected by gravity, making it difficult for them to continue flowing upwards. They then naturally fall back into the through-hole, achieving effective separation of high-density inorganic granular sludge, avoiding the misdischarge of denser inorganic particles, and improving the recovery efficiency of functional microorganisms. This ensures that the screened granular sludge of the target particle size is quickly and efficiently guided to the external environment, achieving smooth discharge or transport, reducing internal accumulation and retention; it also discharges air bubbles inherent in the wastewater flow or those generated by the rotation of the rotating component, preventing excessive pressure within the device and improving operational stability. Simultaneously, because the inlet of the drainage pipe gradually narrows towards the outlet, the flow velocity within the pipe gradually increases, creating a certain negative pressure effect at the outlet, rapidly discharging the less dense granular sludge containing more functional microorganisms. By cleverly utilizing the combined effects of gravity, gradual increase in flow velocity, and negative pressure, it is possible to both block the reflux of high-density inorganic particles and efficiently extract low-density, well-matured sludge particles rich in functional microorganisms, achieving reflux and discharge of different particle sizes and further improving the selectivity and precision of the target particle size.

[0099] More preferably, the drain pipe 541 includes several pipes;

[0100] They are circumferentially spaced at the same height on the shell and tangentially distributed along the direction of the swirling flow of wastewater on the shell.

[0101] The inlets of each guide pipe are located at the same horizontal height inside the shell.

[0102] In this embodiment, a further preferred embodiment of the discharge pipes is provided: 1. Multiple discharge pipes can improve discharge efficiency; 2. Each discharge pipe is circumferentially spaced at the same height of the shell and tangentially distributed along the swirling direction of the wastewater on the shell; the inlet of each discharge pipe is located at the same horizontal height inside the shell, so that the granular sludge of the target particle size being screened naturally enters the discharge pipe along the swirling direction, reducing abrupt changes in flow direction, reducing turbulence, resistance, and reverse flow, thereby further improving screening efficiency. For example, the number of discharge pipes is three, spaced 120° apart along the side wall of the shell.

[0103] In summary, a preferred cyclone screening device of the present invention is provided, which uses gravity + screening + cyclone triple force field to screen out sludge of the target particle size and introduce it into the alkali heat treatment device; most of the sludge in the alkali heat treatment device comes from external residual sludge, and a small part comes from the sludge discharged from the vertical flow reactor through the cyclone screening device.

[0104] On the other hand, the present invention also provides a sludge resource utilization treatment process, employing any of the above-mentioned sludge resource utilization treatment equipment, including:

[0105] The sludge is introduced into the alkali heat treatment device, heated to 60-80℃, and alkaline substances are added through the alkali feeding component to raise the initial pH value to 11-12. The mixture is stirred for 1-3 hours.

[0106] Then, the mixture is introduced into a hydrolysis digestion device, and activated carbon is added at a dosage of 0.5-1.5 g / g VSS for anaerobic digestion. The mixture is stirred for 4-8 days to recover methane.

[0107] Then, the sludge is introduced into a sedimentation device and allowed to settle for 1-2 hours. The settled sludge is then discharged, and the supernatant is introduced into a vertical flow reactor.

[0108] After removing ammonia nitrogen, the vertical flow reactor discharges qualified clean water, completing the resource utilization treatment of sludge.

[0109] The above-described sludge resource utilization treatment process is based on the above-described sludge resource utilization treatment equipment. The combination of its technical features and beneficial effects will not be elaborated further here. The embodiments described above are merely illustrative of several implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A sludge resource utilization treatment device, characterized in that, include: The alkaline heat treatment device, hydrolysis digestion device, sedimentation device, vertical flow reactor and cyclone sieve guiding device are connected in sequence. Alkali heat treatment device is used to introduce sludge and perform heating and alkalization treatment; The hydrolysis and digestion device is used to receive sludge after heating and alkalization, and to perform hydrolysis and digestion. A sedimentation device is used to receive and settle sludge after hydrolysis and digestion. The precipitate is stored, and the supernatant is introduced into a vertical flow reactor; A vertical flow reactor is used to remove ammonia nitrogen from the supernatant and discharge purified water. It includes: an inner cylinder, an outer cylinder, a flow guiding device, and an aeration device. The inner cylinder and outer cylinder are connected, separating an inner reaction chamber located inside the inner cylinder and an outer reaction chamber located between the inner and outer cylinders. The flow guiding device is connected to the axial bottom end of the inner cylinder and includes: an inner inclined flow guiding section, an outer inclined flow guiding section, sieve holes provided on the side wall of the inner inclined flow guiding section, and through holes penetrating the flow guiding device. The aeration device is located inside the flow guiding device. A cyclone sieving device is installed inside a vertical flow reactor. One end is connected to the bottom of a flow guiding device, and the other end is connected to an alkaline heat treatment device. It is used to guide sludge of the target particle size from the vertical flow reactor into the alkaline heat treatment device. The cyclone sieving device includes a shell frame, a rotating assembly, a screen assembly, and a guide assembly. The shell frame is closed on the sides and has a through hole in the center that connects to the axial bottom end of the vertical flow reactor. The rotating assembly is rotatably installed inside the through hole. The screen assembly is installed inside the through hole, and its outer edge is connected to the inner wall of the shell frame. It includes a first screen installed above the through hole and a second screen installed below the through hole. The mesh diameter of the first screen is smaller than that of the second screen. The guide assembly is installed on one side of the shell frame and is connected to the through hole.

2. The sludge resource utilization treatment equipment according to claim 1, characterized in that, Alkali heat treatment apparatus, comprising: The heating element is located in the middle of the alkaline heat treatment device; The alkali feeding assembly is located at the top of the alkali heat treatment device; The stirring assembly is located at the bottom of the alkali heat treatment device; The first sludge inlet pipe and the first sludge outlet pipe are respectively connected to the sludge storage tank and the hydrolysis digestion device; In addition, there are temperature measuring components and pH measuring components.

3. The sludge resource utilization treatment equipment according to claim 1, characterized in that, Hydrolysis digestion apparatus, comprising: A stirring component located at the bottom; An activated carbon dosing assembly is located on one side of the top, and a methane gas collection assembly is located on the other side of the top. And the second mud inlet pipe and the second mud outlet pipe are set on both sides.

4. The sludge resource utilization treatment equipment according to claim 1, characterized in that, Precipitation apparatus, comprising: The third mud outlet pipe is located at the bottom, and the third mud inlet pipe and the supernatant outlet pipe are located at the top. The third mud discharge pipe is connected to the main mud discharge port; The third mud inlet pipe is connected to the second mud outlet pipe of the hydrolysis and digestion unit. The supernatant outlet pipe is connected to the inlet water of the vertical flow reactor.

5. The sludge resource utilization treatment equipment according to claim 1, characterized in that, The rotating assembly includes a rotating spindle, rotating blades mounted on the rotating spindle, and a rotating drive connected to the rotating spindle, for forming a stable outward vortex inside the through hole.

6. The sludge resource utilization treatment equipment according to claim 5, characterized in that, The rotating blades are wider at the top and narrower at the bottom, and are tilted. The rotating blades are provided with a biomimetic antifouling coating, which includes a base layer, a functional layer and an antibacterial layer connected sequentially from the inside to the outside.

7. The sludge resource utilization treatment equipment according to claim 6, characterized in that, The base layer is a titanium alloy substrate treated with micro-arc oxidation. The functional layer is a composite layer of graphene and polytetrafluoroethylene, with shark skin-inspired microgrooves constructed on its surface. The antibacterial layer is made of silver-loaded mesoporous silica nanoparticles.

8. The sludge resource utilization treatment equipment according to any one of claims 1 to 7, characterized in that, The guide assembly includes at least one guide tube; The drainage pipe is arranged at an upward angle relative to the horizontal plane, with the first end connected to the through hole and the second end connected to the outside. The diameter of the drainage pipe gradually decreases from the inlet to the outlet along the direction of sewage flow, forming a tapering structure.

9. The sludge resource utilization treatment equipment according to claim 8, characterized in that, The drainage pipes consist of several sections; They are circumferentially spaced at the same height on the shell and tangentially distributed along the direction of the swirling flow of wastewater on the shell. The inlets of each guide pipe are located at the same horizontal height inside the shell.

10. A sludge resource utilization treatment process, characterized in that, The sludge resource utilization treatment equipment according to any one of claims 1 to 9 includes: The sludge is introduced into the alkali heat treatment device, heated to 60-80℃, and alkaline substances are added through the alkali feeding component to raise the initial pH value to 11-12. The mixture is stirred for 1-3 hours. Then, the mixture is introduced into a hydrolysis digestion device, and activated carbon is added at a dosage of 0.5-1.5 g / g VSS for anaerobic digestion. The mixture is stirred for 4-8 days to recover methane. Then, the sludge is introduced into a sedimentation device and allowed to settle for 1-2 hours. The settled sludge is then discharged, and the supernatant is introduced into a vertical flow reactor. After removing ammonia nitrogen, the vertical flow reactor discharges qualified clean water, completing the resource utilization treatment of sludge; The cyclone screen guide device introduces the target particle size sludge from the vertical flow reactor into the alkali heat treatment device.

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