Domestic sewage sludge dewatering method and equipment

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a domestic sewage sludge dewatering method and equipment, the domestic sewage sludge dewatering equipment comprises a rack, an upper filter belt and a lower filter belt are mounted on the rack, rollers are mounted on the rack, and the upper filter belt and the lower filter belt are rotatably mounted through the rollers; a material distributing groove and a medicine adding groove are sequentially formed in the rack from left to right, a gravity settling area, a pre-extrusion area and a filter pressing area are sequentially arranged in the rotating direction of the upper filter belt, and the material distributing groove is located at the left end of the gravity settling area; a material limiting frame is mounted on the upper filter belt, is positioned in the gravity settling area, and is U-shaped; a vibrating plate is installed in the material limiting frame, a vibrating mechanism is installed on the machine frame, and the vibrating mechanism drives the vibrating plate to vibrate up and down in a reciprocating mode. The sludge dewatering device is simple in structure, promotes the dewatering of water in sludge, improves the sludge dewatering efficiency and effect, and avoids or reduces the possibility of sludge leakage and sludge leakage when the sludge is too much or the water content is high.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, in particular to a method and equipment for dewatering domestic sewage sludge. Background Art

[0002] Sludge is composed of solid matter in the original wastewater and solid matter generated during the wastewater treatment process. With the increasing urban population, the amount of urban sewage is gradually increasing. With the continuous development of wastewater treatment technology, wastewater can be treated accordingly, but the sludge generated has brought new treatment problems. The harmful factors in the sludge generated after domestic sewage treatment, such as heavy metals, organic pollutants, parasites, pathogens and odor, will seriously affect the urban environment and endanger human health.

[0003] The belt filter press is a very common device structure for treating water-containing sludge to obtain a relatively dry mud cake. Its biggest feature is that it has a large processing capacity and can realize continuous and uninterrupted processing. However, in actual applications, it is found that when the water content of the treated sludge is high, or the sludge flow rate is increased, the processing efficiency and quality will decrease. The main reason is that the rate in the gravity sedimentation area cannot be too fast. When the sludge flow rate in the gravity sedimentation area is accelerated, the water filtration separation amount will be reduced, so that it is easy to increase the water content of the mud cake obtained when discharged into the subsequent extrusion and pressing station, and it is difficult to meet the requirements. In addition, when the flow rate in the gravity sedimentation area becomes slow, the work efficiency will be significantly reduced, so that the amount of sludge treated per unit time is suppressed. Moreover, when the water content of the treated sludge is high, it will often cause the water content of the mud cake obtained in the subsequent pressing process to be difficult to meet the requirements. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, promote the removal of water from sludge, improve the efficiency and effect of sludge dehydration, and avoid or reduce the possibility of sludge running or leakage when there is too much sludge or high water content, the present invention proposes a method and equipment for dehydrating domestic sewage sludge.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: the domestic sewage sludge dewatering equipment of the present invention comprises a frame, an upper filter belt and a lower filter belt are installed on the frame, a roller is installed on the frame, and the upper filter belt and the lower filter belt are rotatably installed by the roller; The frame is provided with a material distribution trough and a medicine addition trough from left to right in sequence, and a gravity sedimentation area, a pre-extrusion area and a filter pressing area are provided in sequence in the rotation direction of the upper filter belt, and the material distribution trough is located at the left end of the gravity sedimentation area; A material limiting frame is installed on the upper filter belt, the material limiting frame is located in the gravity sedimentation area, and the material limiting frame is in a U-shape; A vibration plate is installed in the material limiting frame, and a vibration mechanism is installed on the frame. The vibration mechanism drives the vibration plate to vibrate reciprocatingly up and down.

[0006] Preferably, the vibration plates are symmetrically arranged on the upper and lower sides of the upper filter belt in the gravity sedimentation zone, and the vibration plates are arranged in multiple groups; An elastic connecting plate is mounted on the vibration plate, a fixing plate is mounted on the elastic connecting plate, and a toggle rod is mounted on the fixing plate; The vibration mechanism comprises a vibration bracket, a vibration motor is mounted on the vibration bracket, a cam is mounted on the output shaft of the vibration motor, a connecting bracket is mounted on the cam, and the other end of the connecting bracket is mounted on the toggle rod; Two cams are installed on the output shaft of the vibration motor, and the two cams correspond to the toggle rods located at the upper and lower sides of the upper filter belt respectively.

[0007] Preferably, the hardness of the elastic connecting plate below the upper filter belt is greater than the hardness of the elastic connecting plate above the upper filter belt, and the vibration plates on the upper and lower sides of the upper filter belt move toward each other to drive the upper filter belt to move upward.

[0008] Preferably, an elastic sheet is installed on the vibration plate above the upper filter belt, the elastic sheet is arc-shaped, and the lower end of the elastic sheet does not contact the surface of the upper filter belt.

[0009] Preferably, it further comprises a blocking tube, which is sleeved on the surface of the upper filter belt, is an elastic hollow tube, is located between the limit frame and the upper filter belt, and a guide groove is provided on the surface of the roller, which is used to accommodate and position the blocking tube; The blocking tubes are arranged in multiple groups, and the spacing between the blocking blocks gradually decreases in the direction from the middle position to the edge position of the upper filter belt.

[0010] Preferably, the blocking tubes are all located inside the material limiting frame, and the blocking tubes block the gap between the material limiting frame and the upper filter belt.

[0011] A method for dewatering domestic sewage sludge, the dewatering method is applicable to any of the domestic sewage sludge dewatering equipment described above, and the dewatering method comprises the following steps: S1: Domestic sewage is passed into a treatment tank for sedimentation and conditioning, so that the sludge in the domestic sewage is separated and concentrated; during the sedimentation of domestic sewage, flocculants are added to the sedimentation tank to promote the formation and precipitation of sludge particles; S2: The sludge at the bottom of the sedimentation tank is pumped and transported to the distribution trough of the dewatering equipment through the sludge pump, and the sludge to be treated is evenly distributed to the gravity sedimentation area on the upper filter cloth through the distribution trough; S3: adding the treatment agent through the dosing tank on the dehydration equipment; Wherein, the treatment agent is a mixture of a flocculant and a regenerated material, and the regenerated material is crushed dried sludge powder.

[0012] Preferably, the amount of the treatment agent placed in the material limiting frame near the edge of the upper filter belt is greater than the amount of the treatment agent placed in the material limiting frame near the middle of the upper filter belt.

[0013] The beneficial effects of the present invention are as follows: 1. The method and equipment for dewatering domestic sewage sludge described in the present invention vibrates, squeezes and stirs the sludge in the gravity sedimentation area by setting a material limiting frame, a vibration plate and an elastic sheet, so as to avoid the formation of a dense layer after dehydration of the sludge close to the surface of the upper filter belt, which affects the removal of water from the remaining sludge, thereby promoting the removal of water from the sludge and improving the sludge dewatering efficiency. At the same time, the sludge position on the upper filter belt is limited by the material limiting frame to facilitate the removal of water from the sludge, thereby processing sludge with a higher water content or a larger amount of sludge, and further improving the sludge dewatering efficiency and dewatering effect.

[0014] 2. The domestic sewage sludge dewatering method and equipment described in the present invention restricts the flow of sludge on the surface of the upper filter belt by setting a limiting frame and a blocking tube to prevent the sludge from overflowing the upper filter belt. At the same time, the blocking tube is used to separate the sludge on the upper filter belt, and more treatment agents composed of dried sludge powder are added near the edge of the upper filter belt to quickly reduce the water content and fluidity of the sludge at the edge of the upper filter belt. With the effect of the blocking tube, the sludge near the edge of the upper filter belt hinders and blocks the sludge near the middle of the upper filter belt with better fluidity, thereby avoiding sludge running and leakage during the sludge dewatering process, thereby ensuring the efficiency and effect of sludge dewatering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1 is a perspective view of the dehydration device of the present invention; Figure 2 It is a structural schematic diagram of the dehydration equipment of the present invention; Figure 3 It is a schematic diagram of the structure of the vibrating plate and the upper filter belt of the dehydration equipment of the present invention; Figure 4 It is a top view of the limit frame and the upper filter belt of the dehydration equipment of the present invention; Figure 5 It is a structural schematic diagram of the vibration mechanism in the dehydration equipment of the present invention; Figure 6 yes Figure 1 A partial enlarged view of the middle part; Figure 7 yes Figure 1A partial enlarged view of point B in the middle; Figure 8 yes Figure 3 A partial enlarged view of point C in the middle; Fig. 9 yes Figure 3 A partial enlarged view of point D in the middle; Fig.10 It is a flowchart of the steps of the dehydration method of the present invention; In the figure: frame 1, roller 11, upper cleaning box 12, lower cleaning box 13, material distribution trough 14, dosing trough 15, drainage trough 16, lower filter belt 2, upper filter belt 3, blocking tube 31, material limit frame 32, vibration plate 4, elastic sheet 41, lower plate 411, elastic connecting plate 42, fixing plate 43, toggle rod 44, vibration bracket 45, vibration motor 451, cam 452, connecting frame 453, tensioning mechanism 5, gravity sedimentation zone I, pre-extrusion zone II, filter press zone III. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0018] like Figures 1 to 10 As shown, the domestic sewage sludge dewatering equipment of the present invention comprises a frame 1, an upper filter belt 3 and a lower filter belt 2 are installed on the frame 1, a roller 11 is installed on the frame 1, and the upper filter belt 3 and the lower filter belt 2 are rotatably installed through the roller 11; The frame 1 is provided with a material distribution trough 14 and a drug addition trough 15 from left to right in sequence, and the upper filter belt 3 is provided with a gravity sedimentation zone I, a pre-extrusion zone II and a filter pressing zone III in sequence in the rotation direction, and the material distribution trough 14 is located at the left end of the gravity sedimentation zone I; A limiting material frame 32 is installed on the upper filter belt 3, and the limiting material frame 32 is located in the gravity sedimentation area I, and the limiting material frame 32 is in a U-shape; A vibration plate 4 is installed in the material limiting frame 32, and a vibration mechanism is installed on the frame 1, and the vibration mechanism drives the vibration plate 4 to vibrate up and down; Among them, a tensioning mechanism 5 is also installed on the frame 1 of the dewatering equipment, and the upper filter belt 3 and the lower filter belt 2 are tensioned by the tensioning mechanism 5 to ensure that the upper filter belt 3 and the lower filter belt 2 remain in a taut state, thereby reducing the water content of the mud cake after dehydration, reducing the volume of the sludge after dehydration, and improving the sludge dehydration treatment effect; at the same time, the upper filter belt 3 and the lower filter belt 2 are driven by the driving motor of the prior art; At the same time, an upper cleaning box 12 and a lower cleaning box 13 are also installed on the frame 1. The upper cleaning box 12 is used to spray and clean the upper filter belt 3, and the lower cleaning box 13 is used to spray and clean the lower filter belt 2, so that the upper filter belt 3 and the lower filter belt 2 can clean the sludge attached to the surface of the filter belt after leaving the filter pressing area III, so as to avoid clogging of the filter belt and affecting the dehydration effect and dehydration efficiency of the sludge. At the same time, the water generated in the gravity sedimentation area I, the pre-squeezing area II and the filter pressing area III is collected and discharged through the drainage trough 16 installed on the frame 1, so as to avoid the waste water generated in the process of sludge dehydration treatment from flowing around and polluting the working environment; When dehydrating the sludge, the sludge to be dehydrated is evenly distributed on the surface of the upper filter belt 3 located in the gravity settling area I through the distribution trough 14, so that most of the free water in the sludge is initially removed by gravity in the gravity settling area I; Afterwards, as the upper filter belt 3 and the lower filter belt 2 run, the sludge will enter the pre-squeezing zone II where the upper filter belt 3 and the lower filter belt 2 gradually approach each other, and the sludge will be pre-treated and squeezed, thereby further removing the water contained in the sludge, and preventing the upper filter belt 3 and the lower filter belt 2 from squeezing the sludge too quickly, resulting in the water in the sludge not being able to be removed in time, causing the sludge to leak from both sides of the upper filter belt 3 and the lower filter belt 2, affecting the sludge dehydration effect and efficiency; After that, the sludge will enter the subsequent filter pressing area III, where the upper filter belt 3, the lower filter belt 2 and the roller 11 squeeze and press the sludge to fully remove the water in the sludge, thereby reducing the water content and volume of the dehydrated sludge; At the same time, when the material distribution trough 14 arranges the sludge on the surface of the upper filter belt 3, the flow of the sludge is restricted by the material limiting frame 32, so as to prevent the sludge from overflowing from the gravity settling area I when the sludge has a high water content and a large amount of sludge is arranged, thereby polluting the dehydration equipment and the working environment, and affecting the sludge dehydration effect and dehydration efficiency; At the same time, when the upper filter belt 3 drives the sludge in the limiting frame 32 to move toward the pre-squeezing zone II, the water in the sludge will gradually escape under the action of gravity. In this process, the water content in the sludge close to the surface of the upper filter belt 3 gradually decreases, and the sludge layer gradually becomes dense, which will affect the escape of water in the sludge far from the surface of the upper filter belt 3. At this time, in order to ensure the dehydration effect, it is necessary to reduce the moving speed of the upper filter belt 3 or reduce the amount of sludge arranged; At the same time, the vibration mechanism drives the vibration plate 4 in the limiting frame 32 to vibrate up and down, and the vibration plate 4 is used to vibrate, squeeze and stir the sludge in the limiting frame 32, so that the sludge layer that becomes relatively dense after the water is removed near the surface of the upper filter belt 3 is destroyed, so that the water in the sludge far away from the surface of the upper filter belt 3 moves downward and passes through the upper filter belt 3 for removal, thereby increasing the dehydration speed of the sludge in the gravity sedimentation zone I, and reducing the adverse effect of the upper filter belt 3 on the filtration and separation amount of water in the sludge when the flow speed of the upper filter belt 3 in the gravity sedimentation zone I is too fast, so that the upper filter belt 3 does not need to reduce the moving speed of the upper filter belt 3 when the sludge water content is high or the amount of sludge arranged is large, in order to ensure the dehydration effect of the gravity sedimentation zone I, resulting in a decrease in the overall operating speed of the dehydration equipment, affecting the efficiency and dehydration effect of the sludge dehydration.

[0019] As an embodiment of the present invention, the vibration plates 4 are symmetrically arranged on the upper and lower sides of the upper filter belt 3 in the gravity sedimentation zone I, and the vibration plates 4 are arranged in multiple groups; An elastic connecting plate 42 is installed on the vibration plate 4, a fixing plate 43 is installed on the elastic connecting plate 42, and a toggle rod 44 is installed on the fixing plate 43; The vibration mechanism includes a vibration bracket 45, a vibration motor 451 is mounted on the vibration bracket 45, a cam 452 is mounted on the output shaft of the vibration motor 451, a connecting bracket 453 is mounted on the cam 452, and the other end of the connecting bracket 453 is mounted on the toggle rod 44; Two cams 452 are installed on the output shaft of the vibration motor 451, and the two cams 452 correspond to the toggle rods 44 located at the upper and lower sides of the upper filter belt 3 respectively; The vibration plate 4 includes an upper plate and a lower plate 411, wherein the upper plate is located above the upper filter belt 3, and the lower plate 411 is located below the lower filter belt 2. At the same time, since the upper plate and the lower plate 411 are respectively connected to two cams 452 on the vibration motor 451, when the vibration motor 451 drives the two cams 452 to rotate, the upper plate and the lower plate 411 will move relative to each other, squeezing the sludge between the upper plate and the lower plate 411 and the upper filter belt 3, thereby promoting sludge dehydration and improving the sludge dehydration effect; At the same time, due to the mutual cooperation between the upper plate and the lower plate 411, when the vibration motor 451 drives the vibration plate 4 to vibrate: during the reciprocating motion of the upper plate, before the upper plate and the lower plate 411 are not in contact with each other, the upper plate has a vibration effect on the sludge on the upper filter belt 3, causing the sludge to be impacted and sheared, thereby promoting the separation of water and solid particles in the sludge and avoiding the formation of a dense layer of sludge near the surface of the upper filter belt 3, thereby improving the sludge dehydration efficiency and dehydration effect. When the upper plate and the lower plate 411 are in contact with each other, the upper plate and the lower plate 411 will have an extrusion effect on the sludge, squeezing out the water in the sludge, and further improving the sludge dehydration efficiency and dehydration effect.

[0020] As an embodiment of the present invention, the hardness of the elastic connecting plate 42 below the upper filter belt 3 is greater than the hardness of the elastic connecting plate 42 above the upper filter belt 3, and the vibration plates 4 on the upper and lower sides of the upper filter belt 3 move toward each other to drive the upper filter belt 3 to move upward; Since the upper plate and the lower plate 411 are both installed through the elastic connecting plate 42 with elasticity, when the vibration motor 451 drives the upper plate and the lower plate 411 to vibrate, there will be no forced squeezing and abutment between the upper plate and the lower plate 411, thereby preventing the upper plate and the lower plate 411 from abutting against each other and getting stuck, causing overload damage to the vibration motor 451, and preventing the upper plate and the lower plate 411 from exerting too much squeezing force on the sludge, causing the sludge to be pressed into a dense mud cake or the sludge to splash and overflow from the gravity sedimentation area I after being pressed, thereby polluting the dehydration equipment and the working environment, and affecting the sludge dehydration effect; At the same time, since the hardness of the elastic connecting plate 42 corresponding to the lower plate 411 is relatively large, when the lower plate 411 and the upper plate move relative to each other and the two abut against the sludge, the elastic connecting plate 42 corresponding to the upper plate will first undergo elastic deformation, thereby causing the upper plate to move upward under the action of elasticity, that is, the lower plate 411 drives the upper filter belt 3 and the sludge to move upward. During this process, the sludge between the upper plate and the lower plate 411 will be in a centrifugal state, and the centrifugal force will be used to further separate the water in the sludge, thereby promoting the improvement of the sludge dehydration efficiency and effect.

[0021] As an embodiment of the present invention, an elastic sheet 41 is installed on the vibration plate 4 above the upper filter belt 3, and the elastic sheet 41 is arc-shaped, and the lower end of the elastic sheet 41 does not contact the surface of the upper filter belt 3; When the upper plate moves toward the upper filter belt 3, the elastic sheet 41 on the upper plate will gradually contact and insert into the sludge on the surface of the upper filter belt 3. At the same time, since the elastic sheet 41 is arc-shaped, when the upper plate moves toward the upper filter belt 3, the elastic sheet 41 will shovel the sludge to turn the sludge, that is, promote the part of the sludge away from the surface of the upper filter belt 3 to move to a position close to the surface of the upper filter belt 3, and avoid the part of the sludge close to the surface of the upper filter belt 3 to form a dense layer, which affects the sludge dehydration.

[0022] As an embodiment of the present invention, it also includes a blocking tube 31, which is sleeved on the surface of the upper filter belt 3, and is an elastic hollow tube. The blocking tube 31 is located between the limit frame and the upper filter belt 3, and a guide groove is opened on the surface of the roller 11, and the guide groove is used to accommodate and position the blocking tube 31; The blocking tubes 31 are provided in multiple groups, and the spacing between the blocking blocks gradually decreases in the direction from the middle position to the edge position of the upper filter belt 3; By arranging the blocking tube 31 on the surface of the upper filter belt 3, the dewatered sludge can be separated into a plurality of relatively independent parts by the blocking tube 31, so that when the sludge enters the pre-extrusion zone II and the filter press zone III, the sludge will not flow along the width direction of the upper filter belt 3, thereby avoiding or reducing the sludge running and leakage during the sludge dewatering process of the dewatering equipment, thereby ensuring the sludge dewatering efficiency and dewatering effect.

[0023] As an embodiment of the present invention, the blocking tubes 31 are all located inside the material limiting frame 32, and the blocking tubes 31 block the gap between the material limiting frame 32 and the upper filter belt 3; The blocking tube 31 is used to fill and block the gap between the material limit frame 32 and the upper filter belt 3, so that when the vibration plate 4 vibrates and drives the upper filter belt 3 to shake slightly in the vertical direction, the gap between the material limit frame 32 and the upper filter belt 3 is still relatively small, reducing the possibility of sludge leakage from the gap between the material limit frame 32 and the upper filter belt 3, thereby ensuring the sludge dehydration effect and efficiency.

[0024] A method for dewatering domestic sewage sludge, the dewatering method is applicable to any of the domestic sewage sludge dewatering equipment described above, and the dewatering method comprises the following steps: S1: Domestic sewage is passed into a treatment tank for sedimentation and conditioning, so that the sludge in the domestic sewage is separated and concentrated; during the sedimentation of domestic sewage, flocculants are added to the sedimentation tank to promote the formation and precipitation of sludge particles; S2: The sludge at the bottom of the sedimentation tank is pumped and transported to the distribution trough 14 of the dewatering equipment through the sludge pump, and the sludge to be treated is evenly distributed to the gravity sedimentation area I on the upper filter cloth through the distribution trough 14; S3: adding the treatment agent through the dosing tank 15 on the dehydration equipment; Wherein, the treatment agent is a mixture of a flocculant and a regenerated material, and the regenerated material is crushed dried sludge powder; After the dried sludge is crushed, it is recycled and reused. After the flocculant is evenly mixed with the dried sludge powder, the volume of the treatment agent is increased, thereby facilitating the addition of the treatment agent. At the same time, the use of dried sludge powder for re-addition can quickly reduce the water content of the sludge, causing the sludge to precipitate and coagulate, and reuse the flocculant remaining in the dried sludge after the last treatment, thereby reducing the amount of flocculant used and avoiding the increase in the volume of the sludge after dehydration after the addition of other substances.

[0025] As an embodiment of the present invention, the amount of the treatment agent placed in the position close to the edge of the upper filter belt 3 in the material limiting frame 32 is greater than the amount of the treatment agent placed in the position close to the middle of the upper filter belt 3 in the material limiting frame 32; By adding more treatment agent near the edge of the upper filter belt 3, the water content of the sludge near the edge of the upper filter belt 3 is rapidly reduced and the fluidity of the sludge is reduced. In addition, the blocking effect of the blocking tube 31 on the sludge and the separation effect of the blocking block on the sludge make the relative position of the sludge on the upper filter belt 3 less likely to change, reducing the possibility of sludge running and leaking in the dewatering equipment when the subsequent sludge enters the pre-extrusion zone II and the filter press zone III, thereby ensuring good sludge dewatering efficiency and dewatering effect.

[0026] The specific workflow is as follows: When dehydrating the sludge, the sludge to be dehydrated is evenly distributed on the surface of the upper filter belt 3 located in the gravity settling area I through the distribution trough 14, so that most of the free water in the sludge is initially removed by gravity; Afterwards, as the upper filter belt 3 and the lower filter belt 2 run, the sludge will enter the pre-squeezing zone II where the upper filter belt 3 and the lower filter belt 2 gradually approach each other, and the water contained in the sludge will be further removed; After that, the sludge will enter the subsequent filter pressing area III, where the upper filter belt 3, the lower filter belt 2 and the roller 11 squeeze and press the sludge to fully remove the water in the sludge; At the same time, when the material distribution trough 14 arranges the sludge on the surface of the upper filter belt 3, the flow of the sludge is restricted by the material limiting frame 32; At the same time, when the upper filter belt 3 drives the sludge in the limiting frame 32 to move toward the pre-squeezing zone II, the water in the sludge will gradually escape under the action of gravity. In this process, the water content of the sludge near the surface of the upper filter belt 3 gradually decreases, and the sludge layer gradually becomes dense. At the same time, the vibration mechanism drives the vibration plate 4 in the material limiting frame 32 to vibrate up and down, vibrating, squeezing and stirring the sludge in the material limiting frame 32, so that the sludge layer that becomes relatively dense after the water is removed near the surface of the upper filter belt 3 is destroyed, so that the water in the sludge far from the surface of the upper filter belt 3 moves downward and passes through the upper filter belt 3 before being removed; The vibration plate 4 includes an upper plate and a lower plate 411, wherein the upper plate is located above the upper filter belt 3, and the lower plate 411 is located below the lower filter belt 2. At the same time, since the upper plate and the lower plate 411 are respectively connected to two cams 452 on the vibration motor 451, when the vibration motor 451 drives the two cams 452 to rotate, the upper plate and the lower plate 411 will move relative to each other, and the sludge between the upper plate and the lower plate 411 and the upper filter belt 3 are squeezed; At the same time, due to the mutual cooperation between the upper plate and the lower plate 411, when the vibration motor 451 drives the vibration plate 4 to vibrate: during the reciprocating motion of the upper plate, before the upper plate and the lower plate 411 abut against each other, the upper plate has a vibration effect on the sludge on the upper filter belt 3, so that the sludge is impacted and sheared, promoting the separation of water and solid particles in the sludge and avoiding the formation of a dense layer of sludge close to the surface of the upper filter belt 3, and when the upper plate and the lower plate 411 abut against each other, the upper plate and the lower plate 411 will squeeze the sludge to squeeze out the water in the sludge; Since the upper plate and the lower plate 411 are both mounted by means of the elastic connecting plate 42, there will be no forced squeezing and abutment between the upper plate and the lower plate 411, thereby preventing the vibration motor 451 from being overloaded and damaged, and preventing the upper plate and the lower plate 411 from squeezing the sludge too much, causing the sludge to be pressed into a dense mud cake or the sludge to splash and overflow from the gravity sedimentation area I after being pressed; At the same time, since the hardness of the elastic connecting plate 42 corresponding to the lower plate 411 is relatively large, when the lower plate 411 and the upper plate move relative to each other and the two abut against the sludge, the elastic connecting plate 42 corresponding to the upper plate will first undergo elastic deformation, so that the upper plate moves upward under the elastic action, that is, the lower plate 411 drives the upper filter belt 3 and the sludge to move upward. In this process, the sludge between the upper plate and the lower plate 411 will be in a centrifugal state, and the centrifugal force is used to further separate the water in the sludge. When the upper plate moves toward the upper filter belt 3, the elastic sheet 41 on the upper plate will gradually contact and insert into the sludge on the surface of the upper filter belt 3. Since the elastic sheet 41 is arc-shaped, the elastic sheet 41 will shovel the sludge, so that the sludge is turned over, that is, the part of the sludge away from the surface of the upper filter belt 3 is promoted to move to a position close to the surface of the upper filter belt 3; By arranging the barrier tube 31 on the surface of the upper filter belt 3, the dewatered sludge can be separated into a plurality of relatively independent parts by the barrier tube 31. When the sludge enters the pre-squeezing zone II and the filter pressing zone III, the sludge will not flow along the width direction of the upper filter belt 3, thereby avoiding or reducing the occurrence of sludge running and leakage in the dewatering process of the sludge. The blocking tube 31 is used to fill and block the gap between the material limiting frame 32 and the upper filter belt 3. When the vibration plate 4 vibrates and drives the upper filter belt 3 to shake slightly in the vertical direction, the gap between the material limiting frame 32 and the upper filter belt 3 is still relatively small, thereby reducing the possibility of sludge leakage from the gap between the material limiting frame 32 and the upper filter belt 3. After the dried sludge is crushed, it is recycled and reused. After the flocculant is evenly mixed with the dried sludge powder, the volume of the treatment agent is increased, which is convenient for adding the treatment agent. At the same time, the use of dried sludge powder for re-addition can quickly reduce the water content of the sludge, so that the sludge will precipitate and coagulate, and the flocculant remaining in the dried sludge after the last treatment can be reused, thereby reducing the use of flocculants and avoiding the increase in the volume of the sludge after dehydration after the addition of other substances; By adding more treatment agent near the edge of the upper filter belt 3, the water content of the sludge near the edge of the upper filter belt 3 is rapidly reduced and the fluidity of the sludge is reduced. In addition, the blocking effect of the blocking tube 31 on the sludge and the separation effect of the blocking block on the sludge make the relative position of the sludge on the upper filter belt 3 less likely to change, reducing the possibility of sludge running and leaking in the dewatering equipment when the subsequent sludge enters the pre-extrusion zone II and the filter press zone III, thereby ensuring good sludge dewatering efficiency and dewatering effect.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A domestic sewage sludge dewatering device, comprising a frame (1), an upper filter belt (3) and a lower filter belt (2) are mounted on the frame (1), a roller (11) is mounted on the frame (1), and the upper filter belt (3) and the lower filter belt (2) are rotatably mounted via the roller (11); The frame (1) is provided with a material distribution trough (14) and a drug addition trough (15) in sequence from left to right, and the upper filter belt (3) is provided with a gravity sedimentation zone (I), a pre-extrusion zone (II) and a filter press zone (III) in sequence in the rotation direction, and the material distribution trough (14) is located at the left end of the gravity sedimentation zone (I); Features: A limiting material frame (32) is installed on the upper filter belt (3), the limiting material frame (32) is located in the gravity sedimentation area (I), and the limiting material frame (32) is in the shape of a U; A vibration plate (4) is installed in the material limiting frame (32), and a vibration mechanism is installed on the frame (1), and the vibration mechanism drives the vibration plate (4) to vibrate reciprocatingly up and down.

2. A domestic sewage sludge dewatering device according to claim 1, characterized in that: The vibration plates (4) are symmetrically arranged on the upper and lower sides of the upper filter belt (3) in the gravity sedimentation area (I), and the vibration plates (4) are arranged in multiple groups; An elastic connecting plate (42) is mounted on the vibration plate (4), a fixing plate (43) is mounted on the elastic connecting plate (42), and a toggle rod (44) is mounted on the fixing plate (43); The vibration mechanism comprises a vibration bracket (45), a vibration motor (451) is mounted on the vibration bracket (45), a cam (452) is mounted on the output shaft of the vibration motor (451), a connecting bracket (453) is mounted on the cam (452), and the other end of the connecting bracket (453) is mounted on the toggle rod (44); Two cams (452) are mounted on the output shaft of the vibration motor (451), and the two cams (452) correspond to the toggle rods (44) located at the upper and lower sides of the upper filter belt (3), respectively.

3. A domestic sewage sludge dewatering device according to claim 2, characterized in that: The hardness of the elastic connecting plate (42) below the upper filter belt (3) is greater than the hardness of the elastic connecting plate (42) above the upper filter belt (3), and when the vibration plates (4) on the upper and lower sides of the upper filter belt (3) move towards each other, the upper filter belt (3) is driven to move upward.

4. The domestic sewage sludge dewatering equipment according to claim 2, characterized in that: An elastic sheet (41) is installed on the vibration plate (4) above the upper filter belt (3); the elastic sheet (41) is arc-shaped, and the lower end of the elastic sheet (41) does not contact the surface of the upper filter belt (3).

5. The domestic sewage sludge dewatering equipment according to claim 1, characterized in that: It also comprises a blocking tube (31), the blocking tube (31) being sleeved on the surface of the upper filter belt (3), the blocking tube (31) being an elastic hollow tube, the blocking tube (31) being located between the limiting frame and the upper filter belt (3), and a guide groove being provided on the surface of the roller (11), the guide groove being used to accommodate and position the blocking tube (31); The blocking tubes (31) are provided in multiple groups, and the spacing between the blocking blocks gradually decreases in the direction from the middle position to the edge position of the upper filter belt (3).

6. A domestic sewage sludge dewatering device according to claim 5, characterized in that: The blocking tubes (31) are all located inside the material limiting frame (32), and the blocking tubes (31) block the gap between the material limiting frame (32) and the upper filter belt (3).

7. A method for dewatering domestic sewage sludge, characterized in that: The dehydration method is applicable to a domestic sewage sludge dehydration device as described in any one of claims 1 to 6 above, and the dehydration method comprises the following steps: S1: Domestic sewage is passed into a treatment tank for sedimentation and conditioning, so that the sludge in the domestic sewage is separated and concentrated; during the sedimentation of domestic sewage, flocculants are added to the sedimentation tank to promote the formation and precipitation of sludge particles; S2: The sludge at the bottom of the sedimentation tank is pumped and transported to the distribution trough (14) of the dewatering equipment through the sludge pump, and the sludge to be treated is evenly distributed to the gravity sedimentation area (I) on the upper filter cloth through the distribution trough (14); S3: adding the treatment agent through the dosing tank (15) on the dehydration device; Wherein, the treatment agent is a mixture of a flocculant and a regenerated material, and the regenerated material is crushed dried sludge powder.

8. A method for dewatering domestic sewage sludge according to claim 7, characterized in that: The amount of treatment agent placed in the material limiting frame (32) close to the edge of the upper filter belt (3) is greater than the amount of treatment agent placed in the material limiting frame (32) close to the middle of the upper filter belt (3).

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