Sludge recycling system for biological phosphorus removal of sewage

Abstract

The invention discloses a sludge recycling system for biological phosphorus removal of sewage. The sludge recycling system comprises a vertical multi-bucket filter pressing device, a roller dryer, a crushing and primary mixing device and a rotary roller mixer, the inlet end of the vertical multi-hopper filter pressing device is communicated with the outlet of the sludge pump, dewatered sludge subjected to filter pressing by the vertical multi-hopper filter pressing device is dried by the roller dryer, and the dried sludge and fermented straws synchronously enter the crushing and primary mixing device; and the outlet end of the crushing and primary mixing device is communicated with the inlet end of the rotary drum mixer. The purpose of effectively utilizing the phosphorus-containing sludge can be achieved, and on the premise of avoiding environmental pollution, it is ensured that the obtained product can serve as a fertilizer to improve soil, and growth of economic crops such as crops and fruit trees is promoted. The method is suitable for the technical field of recycling of sludge obtained in sewage purification treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage purification and treatment, and in particular relates to a sludge recycling system for biological phosphorus removal from sewage. Background Art

[0002] At present, due to the direct discharge of phosphorus-containing sewage into nearby waters or groundwater, it is very easy to cause eutrophication of water bodies, resulting in serious water pollution. Therefore, it is necessary to treat phosphorus-containing sewage, and convert phosphorus-containing compounds into sediments by using chemical or biological methods, and form sedimentation sludge together with other substances in sewage. In order to effectively reduce the content of harmful substances in sludge, biological phosphorus removal is generally used to treat sewage. And because the obtained part of the sludge is rich in extremely high nutrients, if it is directly abandoned, it will cause great waste. It can be seen from this that a recycling system of the above-mentioned sludge is urgently needed to achieve the purpose of effectively utilizing phosphorus-containing sludge, and on the premise of avoiding environmental pollution, ensure that the obtained product can be used as fertilizer to improve the soil and promote the growth of cash crops such as crops and fruit trees. Summary of the invention

[0003] The present invention provides a sludge recycling system for biological phosphorus removal from sewage, which is used to achieve the purpose of effectively utilizing phosphorus-containing sludge. Under the premise of avoiding environmental pollution, it ensures that the obtained product can be used as fertilizer to improve soil and promote the growth of economic crops such as crops and fruit trees.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A sludge recycling system for biological phosphorus removal from sewage comprises a vertical multi-bucket filter press, a drum dryer, a crushing and primary mixing device and a rotary drum mixer; the inlet end of the vertical multi-bucket filter press is connected to the outlet of a sludge pump, the dewatered sludge filtered by the vertical multi-bucket filter press is dried by the drum dryer, the dried sludge and fermented straw are synchronously introduced into the crushing and primary mixing device, and the outlet end of the crushing and primary mixing device is connected to the inlet end of the rotary drum mixer.

[0006] Furthermore, the vertical multi-bucket filter press device includes a plurality of filter press buckets arranged in sequence along the vertical direction, a conducting channel is formed in the middle of these filter press buckets, the diameter of each filter press bucket gradually expands downward along the vertical direction, and a filter press space connected to the conducting channel is formed between two adjacent filter press buckets, the lower end of the filter press bucket located at the bottom is connected to the fixed seat, and the filter press bucket located at the top is connected to the vertical driving member through a transfer tube, the transfer tube is connected to a conducting hose, and a first control valve is installed on the conducting hose.

[0007] Furthermore, the filter press bucket includes a bucket-shaped body with a first insert tube and a second insert tube respectively constructed at the upper and lower ends of the middle part, the first insert tube and the second insert tube close to each other in adjacent bucket-shaped bodies are movably inserted together, and the two are connected by a connecting spring, and a receiving tube is coaxially constructed on the outer periphery of each bucket-shaped body, and a filter cylinder is installed at the lower end of the receiving tube, and the radial length of the inner circumferential wall of the filter cylinder is not less than the radial length of the outer circumferential wall of the receiving tube; an upper connecting pipe and a lower connecting pipe are respectively constructed at the ends of the bucket-shaped body located at the top and the bucket-shaped body at the bottom that are far away from each other, the upper connecting pipe is connected to the transfer pipe, and a second control valve is installed on the lower connecting pipe.

[0008] Furthermore, the crushing and primary mixing device includes a horizontal assembly cylinder, an adjustable elastic screen cylinder and a two-way conveying mechanism coaxially arranged from the outside to the inside, and the two ends of the two-way conveying mechanism respectively extend out of the axial ends of the horizontal assembly body, and a first transmission wheel and a second transmission wheel are respectively installed at one end of the two-way conveying mechanism and the adjustable elastic screen cylinder away from each other, and a crushing mechanism is arranged between the adjustable elastic screen cylinder and the two-way conveying mechanism.

[0009] Furthermore, the bidirectional conveying mechanism includes a conveying cylinder coaxially arranged in a horizontal assembly cylinder, two ends of the conveying cylinder respectively extend out of the two ends of the horizontal assembly cylinder, and the conveying cylinder is rotatably connected to the two ends of the adjustable elastic screen cylinder, a group of discharge ports are opened in the middle of the conveying cylinder, a group of feed ports are opened at each end of the conveying cylinder, and spiral conveying blades with opposite rotation directions are symmetrically constructed on the inner wall of the conveying cylinder, each of the spiral conveying blades spirally extends from the discharge port along the axial direction of the conveying cylinder to the corresponding feed port, an adapter sleeve is rotatably connected on the conveying cylinder and located at each feed port, and a feed hopper is constructed on the adapter sleeve.

[0010] Furthermore, the crushing mechanism includes a plurality of first crushing parts evenly arranged along the circumference of the bidirectional conveying mechanism, each of the first crushing parts is connected to the bidirectional conveying mechanism, and second crushing parts are arranged between adjacent first crushing parts. The two ends of these second crushing parts are respectively connected to two adjustment components, and each of the adjustment components is connected to the bidirectional conveying mechanism.

[0011] Furthermore, the first crushing member includes a first mounting rod parallel to the axis of the bidirectional conveying mechanism, and a plurality of first elastic crushing rods are configured on the first mounting rod at intervals along its length direction; the second crushing member includes a second mounting rod parallel to the first mounting rod, and a plurality of second elastic crushing rods are configured on the second mounting rod at intervals along its length direction.

[0012] Furthermore, the adjustment assembly includes an adjustment sleeve coaxially fixed to the outside of the bidirectional conveying mechanism, an adjustment ring is movably connected between the adjustment sleeve and the bidirectional conveying mechanism, the adjustment ring is fixedly connected to one end of the second mounting rod close to each other, two connecting columns are symmetrically fixed on the adjustment ring, each of the connecting columns extends out of the adjustment sleeve along the axial direction of the horizontal assembly cylinder, and a locking cap is threadedly connected to the connecting column.

[0013] Furthermore, the adjustable elastic screen cylinder includes two adapter seats symmetrically arranged at the axial ends of the horizontal assembly cylinder, each of the adapter seats is rotatably connected to the horizontal assembly cylinder and the bidirectional conveying mechanism, and an assembly ring is respectively installed on the end faces of the two adapter seats close to each other, and an annular groove coinciding with the axis of the assembly ring is constructed on the outer circumferential surface of each assembly ring, an annular sealing cover is rotatably connected to the outside of the assembly ring, a connecting joint connected to the annular groove is constructed on the annular sealing cover, and the annular sealing cover is detachably connected to the axial end of the horizontal assembly cylinder, and a plurality of assembly rods are installed between the two assembly rings, these assembly rods are evenly arranged along the circumference of the assembly ring, and these assembly rods are connected to the elastic mesh cylinder.

[0014] Furthermore, a plurality of guide sleeves are evenly constructed on the inner circumferential wall of the assembly ring along its circumference, each of the guide sleeves extends radially outward along the assembly ring, a movable column is movably inserted in each guide sleeve, one end of the movable column extending into the annular groove is connected to the assembly ring through a hard spring, the other end of the movable column is hinged with a connecting sleeve, the end of the assembly rod passes through the connecting sleeve, and a fixing nut is threadedly connected to the end of the assembly rod.

[0015] Since the present invention adopts the above-mentioned structure, compared with the prior art, the technical progress achieved is that: the present invention filters the obtained sludge through a vertical multi-bucket filter press device to obtain dehydrated sludge. Since the sludge obtained by the filter press still has a certain water content, and since the phosphorus content in the sludge is relatively high, the water and aerobic bacteria, anaerobic bacteria, etc. in the sludge will cause the deterioration of organic phosphides. Therefore, it is necessary to use a drum dryer to dry the water in the sludge, and to dry and denature the organic phosphides in the sludge; thereafter, a crushing and primary mixing device is used to mix the dried sludge and the fermented straw, and the sludge is crushed into small particles in the crushing and primary mixing device, so that the crushed sludge can be mixed with the fermented straw for a second time in a rotary drum mixer, and a soil remediation agent or a soil improver is added to the rotary drum mixer during the mixing process, and finally a fertilizer rich in nutrients is obtained, thereby achieving the purpose of effectively recycling the sludge obtained by removing phosphorus from sewage. In summary, the present invention can achieve the purpose of effectively utilizing phosphorus-containing sludge, and on the premise of avoiding environmental pollution, ensures that the obtained product can be used as a fertilizer to improve the soil and promote the growth of economic crops such as crops and fruit trees. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] In the attached picture:

[0018] Figure 1 is a structural block diagram of an embodiment of the present invention;

[0019] Figure 2 This is a schematic structural diagram of a vertical multi-bucket filter press device according to an embodiment of the present invention;

[0020] Figure 3 It is a partial structural cross-sectional view of a filter press bucket in a vertical multi-bucket filter press device according to an embodiment of the present invention;

[0021] Figure 4 This is an axial structural cross-sectional view of a vertical multi-bucket filter press device according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of a crushing and primary mixing device according to an embodiment of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the crushing and primary mixing device from another angle according to an embodiment of the present invention;

[0024] Figure 7 This is an axial structural cross-sectional view of a crushing and primary mixing device according to an embodiment of the present invention;

[0025] Figure 8 It is a schematic diagram of the structure of a horizontal assembly cylinder in a crushing and primary mixing device according to an embodiment of the present invention;

[0026] Fig. 9 It is a partial structural schematic diagram of the connection between the bidirectional conveying mechanism and the crushing mechanism in the crushing and primary mixing device according to an embodiment of the present invention;

[0027] Fig.10 This is a schematic diagram of the structure of the crushing mechanism connected to the conveying cylinder in an embodiment of the present invention;

[0028] Fig.11 It is a schematic structural diagram of a plurality of first crushing members connected to a conveying cylinder in a crushing mechanism according to an embodiment of the present invention;

[0029] Fig.12 It is a structural schematic diagram of a plurality of second crushing members connected to two adjustment rings in a crushing mechanism according to an embodiment of the present invention;

[0030] Fig.13 It is a schematic structural diagram of an adjustable elastic screen drum in a crushing and primary mixing device according to an embodiment of the present invention;

[0031] Fig.14 This is a schematic diagram of the structure of the adjustable elastic screen cylinder after removing the elastic mesh cylinder according to an embodiment of the present invention;

[0032] Fig.15 for Fig.14 A magnified view of the structure of the middle A part;

[0033] Fig.16 It is a schematic diagram of the structure of the elastic mesh cylinder in the adjustable elastic screen cylinder according to an embodiment of the present invention.

[0034] Labeled parts: 100-vertical multi-bucket filter press device, 101-filter press bucket, 1011-bucket-shaped body, 1012-first insert, 1013-second insert, 1014-receiving tube, 1015-filter cartridge, 102-fixed seat, 103-transfer tube, 104-conducting hose, 105-first control valve, 106-conducting channel, 107-lower connecting pipe, 108-second control valve, 109-vertical drive member , 110-upper connecting pipe, 111-connecting spring, 112-filter pressing space, 200-drum dryer, 300-crushing and primary mixing device, 301-horizontal assembly cylinder, 302-discharge port, 303-bidirectional conveying mechanism, 3031-conveying cylinder, 3032-spiral conveying blade, 3033-feeding port, 3034-adapter sleeve, 3035-feeding hopper, 3036-discharge port, 304-first transmission wheel, 305 -fixed shaft, 306-crushing mechanism, 3061-first mounting rod, 3062-first elastic crushing rod, 3063-second mounting rod, 3064-second elastic crushing rod, 3065-adjusting ring, 3066-connecting column, 3067-adjusting sleeve, 3068-fixed edge, 3069-locking cap, 307-adjustable elastic screen cylinder, 3071-adapter seat, 3072-assembly ring, 3073-annular groove, 3 074-guide sleeve, 3075-movable column, 3076-connecting sleeve, 3077-assembling rod, 3078-fixing nut, 3079-hard spring, 308-second transmission wheel, 309-annular sealing cover, 310-connecting joint, 311-elastic mesh cylinder, 3111-sleeve body, 3112-mesh body, 312-crushing chamber, 313-discharge chamber, 314-material guiding part, 400-rotary drum mixer. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] The present invention discloses a sludge recycling system for biological phosphorus removal from sewage, such as Figure 1-16As shown, it includes a vertical multi-bucket filter press device 100, a drum dryer 200, a crushing and primary mixing device 300 and a rotary drum mixer 400. Among them, the inlet end of the vertical multi-bucket filter press device 100 is connected to the outlet of the sludge pump, the dewatered sludge filtered by the vertical multi-bucket filter press device 100 is dried by the drum dryer 200, and the dried sludge and the fermented straw are synchronously entered into the crushing and primary mixing device 300, and the outlet end of the crushing and primary mixing device 300 is connected to the inlet end of the rotary drum mixer 400. The working principle and advantages of the present invention are as follows: the present invention filters the obtained sludge through a vertical multi-bucket filter press device 100 to obtain dehydrated sludge. Since the sludge obtained by the filter press still has a certain water content, and since the phosphorus content in the sludge is relatively high, the water and aerobic bacteria, anaerobic bacteria, etc. in the sludge will cause the deterioration of organic phosphides. Therefore, it is necessary to use a drum dryer 200 to dry the water in the sludge, and to dry and denature the organic phosphides in the sludge; thereafter, a crushing and primary mixing device 300 is used to mix the dried sludge and the fermented straw, and the sludge is crushed into small particles in the crushing and primary mixing device 300, so that the crushed sludge can be mixed with the fermented straw for the second time in the rotary drum mixer 400, and during the mixing process, a soil remediation agent or a soil improver is added to the rotary drum mixer 400, and finally a fertilizer rich in nutrients is obtained, thereby achieving the purpose of effectively recycling the sludge obtained by removing phosphorus from sewage. In summary, the present invention can achieve the purpose of effectively utilizing phosphorus-containing sludge, and on the premise of avoiding environmental pollution, ensures that the obtained product can be used as a fertilizer to improve the soil and promote the growth of economic crops such as crops and fruit trees.

[0037] As a preferred embodiment of the present invention, Figure 2-4As shown, the vertical multi-bucket filter press device 100 includes a vertical driving member 109, a transfer tube 103 and a plurality of filter press buckets 101. The vertical driving member 109 of this embodiment is a hydraulic cylinder. The filter press buckets 101 are arranged in sequence along the vertical direction, and a conducting channel 106 is formed in the middle of the filter press buckets 101. The caliber of each filter press bucket 101 gradually expands downward along the vertical direction, and a filter press space 112 is formed between two adjacent filter press buckets 101, and each filter press space 112 is connected to the conducting channel 106. The lower end of the filter press bucket 101 at the bottom is connected to the fixed seat 102, and the filter press bucket 101 at the top is connected to the vertical driving member 109 through the transfer tube 103, and the transfer tube 103 is connected to a conducting hose 104, and a first control valve 105 is installed on the conducting hose 104. The filter press bucket 101 of this embodiment includes a bucket-shaped body 1011, and a first inserting tube 1012 and a second inserting tube 1013 are respectively constructed at the upper and lower ends of the middle part of the bucket-shaped body 1011, and the axes of the bucket-shaped body 1011, the first inserting tube 1012 and the second inserting tube 1013 coincide. The first insert tube 1012 and the second insert tube 1013 close to each other in two adjacent bucket-shaped bodies 1011 are movably inserted together, and the first insert tube 1012 and the second insert tube 1013 are connected to each other through a connecting spring 111, and a receiving tube 1014 is coaxially constructed on the outer periphery of each bucket-shaped body 1011, and a filter tube 1015 is installed at the lower end of the receiving tube 1014, and the radial length of the inner circumferential wall of the filter tube 1015 is not less than the radial length of the outer circumferential wall of the receiving tube 1014, and when the lower part of the filter tube 1015 is inserted outside the receiving tube 1014, the part where the inner wall of the filter tube 1015 contacts the outer wall of the receiving tube 1014 is in a sealed state. In this embodiment, an upper connecting pipe 110 is configured at the upper end of the bucket-shaped body 1011 located at the top, and a lower connecting pipe 107 is configured at one end of the bucket-shaped body 1011 at the bottom. The upper connecting pipe 110 is connected to the transfer pipe 103, and a second control valve 108 is installed on the lower connecting pipe 107. The working principle and advantages of this embodiment are: first, the first control valve 105 is opened, and the second control valve 108 is closed, and the sludge slurry in the sewage is pressurized by the sludge pump, and then enters the conduction channel 106 through the conduction hose 104, and then evenly enters each filter press space 112 until each filter press space 112 is full. Then, the vertical driving member 109 is controlled to move downward, so that it drives the filter press bucket 101 connected thereto to move downward, thereby gradually reducing the spacing between these filter press buckets 101, and the water in the sludge is discharged by the filter cartridge 1015. When the filtration reaches a certain degree, the vertical driving member 109 is controlled to move in the reverse direction, and the connecting spring 111 is elastically returned, so that the spacing between the filter press buckets 101 gradually increases until the filter cylinder 1015 and the receiving cylinder 1014 inserted into each other are separated from each other by a certain distance. Then, the scraper removes the dehydrated sludge on the surface of the filter press bucket 101.Moreover, due to the setting of the filter press bucket 101 in this embodiment, on the one hand, the filtration volume is maximized within the effective space, thereby improving the filtration efficiency. On the other hand, since the outer peripheral wall of the filter press bucket 101 is in an inclined shape, it is convenient to remove the dehydrated sludge.

[0038] As a preferred embodiment of the present invention, Figure 5-7 As shown, the crushing and pre-mixing device 300 includes a horizontal assembly cylinder 301, an adjustable elastic screen cylinder 307 and a bidirectional conveying mechanism 303, the axes of which coincide and are arranged in sequence from the outside to the inside. In this embodiment, the two ends of the bidirectional conveying mechanism 303 extend out of the axial ends of the horizontal assembly body respectively, and the first transmission wheel 304 and the second transmission wheel 308 are respectively installed at the end of the bidirectional conveying mechanism 303 that is away from the adjustable elastic screen cylinder 307, and the crushing mechanism 306 is arranged between the adjustable elastic screen cylinder 307 and the bidirectional conveying mechanism 303. A crushing chamber 312 is formed between the adjustable elastic screen cylinder 307 and the bidirectional conveying mechanism 303, and a discharge chamber 313 is formed between the horizontal assembly cylinder 301 and the adjustable elastic screen cylinder 307. The working principle and advantages of this embodiment are as follows: in this embodiment, the dried sludge and the fermented straw are synchronously supplied to the two-way conveying mechanism 303 from the two ends of the two-way conveying mechanism 303, and the first transmission wheel 304 is driven to rotate, so that the two-way conveying mechanism 303 is driven to rotate, thereby achieving the purpose of continuously conveying the dried sludge and the fermented straw to the middle part of the two-way conveying mechanism 303. The two materials meet in the middle part of the two-way conveying mechanism 303 and enter the crushing chamber 312. The crushing mechanism 306 rotates together with the two-way conveying mechanism 303 to crush and mix the two materials. Since the fermented straw is generally dry and has been cut into sections in advance, the crushing chamber 312 is mainly used to crush the sludge, so that the agglomerated sludge is crushed. At the same time, the second transmission wheel 308 is driven to rotate in the opposite direction, so that the adjustable elastic screen drum 307 rotates in the opposite direction to the bidirectional conveying mechanism 303, so that the crushed sludge and straw are mixed and enter the discharge chamber 313 through the adjustable elastic screen drum 307, and finally discharged from the discharge port 302 at the lower end of the horizontal assembly cylinder 301. In order to smoothly discharge the primary mixed material from the horizontal assembly cylinder 301, the caliber of the horizontal assembly cylinder 301 decreases from the middle to the two ends, so that the part outside the middle of the horizontal assembly cylinder 301 forms a material guide part 314 extending obliquely toward the middle. In this embodiment, the adjustable elastic screen drum 307 can be adjusted so that the adjustable elastic screen drum 307 allows materials of different required particle sizes to pass through, thereby obtaining a mixed material of corresponding particle size.

[0039] As a preferred embodiment of the present invention, Figure 6As shown, the bidirectional conveying mechanism 303 includes a conveying cylinder 3031, the axis of which coincides with the axis of the horizontal assembly cylinder 301, the conveying cylinder 3031 is disposed in the horizontal assembly cylinder 301, the two ends of which extend out of the two ends of the horizontal assembly cylinder 301, and the conveying cylinder 3031 is rotatably connected to the two ends of the adjustable elastic screen cylinder 307. A fixed shaft 305 is detachably connected to one end of the conveying cylinder 3031, and the first transmission wheel 304 is coaxially assembled on the fixed shaft 305. In this embodiment, a group of discharge ports 3036 are provided in the middle of the conveying cylinder 3031, and a group of feed ports 3033 are provided at each axial end of the conveying cylinder 3031; two spiral conveying blades 3032 are symmetrically constructed on the inner wall of the conveying cylinder 3031, and the two spiral conveying blades 3032 have opposite rotation directions, and each spiral conveying blade 3032 spirally extends from the discharge port 3036 along the axial direction of the conveying cylinder 3031 to the corresponding feed port 3033. In this embodiment, an adapter sleeve 3034 is rotatably connected to each group of feed ports 3033 on the conveying cylinder 3031, and a feed hopper 3035 is constructed on the adapter sleeve 3034. The working principle and advantages of this embodiment are as follows: this embodiment drives the first transmission wheel 304 to rotate, so that it drives the conveying cylinder 3031 to rotate, and the two materials are continuously put into the conveying cylinder 3031 by two feeding hoppers 3035, and gradually converge toward the discharge port 3036 under the transportation of two spiral conveying blades 3032, so as to achieve the purpose of primary mixing; then, they are discharged into the crushing chamber 312 through the discharge port 3036, and crushed in the crushing chamber 312, and the purpose of secondary primary mixing is achieved in the process of crushing. At regular intervals, the adjustable elastic screen cylinder 307 can be controlled to expand the screening holes, so that the crushed and mixed materials enter the discharge chamber 313 through the screening holes. That is, the adjustable elastic screen drum 307 can be controlled to realize timed discharging or continuous discharging according to the situation; timed discharging means: when there is no discharging, the adjustable elastic screen drum 307 is controlled to reduce its screening holes to prevent most of the materials from being discharged from the crushing chamber 312; when discharging is required, the adjustable elastic screen drum 307 is controlled to expand its screening holes. Continuous discharging means: the size of the screening holes of the adjustable elastic screen drum 307 is controlled to remain within a predetermined range, so as to achieve the purpose of crushing and discharging at any time.

[0040] As a preferred embodiment of the present invention, Figure 7 , 9-12, the crushing mechanism 306 includes two adjustment components, a plurality of first crushing pieces and a plurality of second crushing pieces. Among them, these first crushing pieces are evenly arranged along the circumference of the conveying cylinder 3031 of the two-way conveying mechanism 303, each first crushing piece is connected to the two-way conveying mechanism 303, each second crushing piece is arranged between two adjacent first crushing pieces, and the two ends of these second crushing pieces are respectively connected to the two adjustment components, and each adjustment component is connected to the two-way conveying mechanism 303. In this embodiment, by adjusting the two adjustment components, the offset spacing between all the second crushing pieces connected to the two and the first crushing pieces changes, thereby achieving the purpose of adjusting the crushing degree. In this embodiment, the first crushing piece includes a first mounting rod 3061, which is parallel to the axis of the conveying cylinder 3031, and a plurality of first elastic crushing rods 3062 are spaced apart on the first mounting rod 3061 along its length direction. The second crushing member includes a second mounting rod 3063, which is parallel to the first mounting rod 3061, and a plurality of second elastic crushing rods 3064 are spaced apart along the length direction of the second mounting rod 3063. Moreover, the first elastic crushing rod 3062 and the second elastic crushing rod 3064 are both made of wear-resistant elastic materials, so that when the two rotate with the conveying cylinder 3031, they can elastically crush the sludge while mixing the materials in the crushing chamber 312, and also elastically knock the adjustable elastic screen cylinder 307 to promote the materials to be discharged from the crushing chamber 312 through the screening holes, avoiding the situation of clogging the adjustable elastic screen cylinder 307. The specific structure of the adjustment component of this embodiment is that the adjustment component includes an adjustment sleeve 3067 and an adjustment ring 3065, wherein the adjustment sleeve 3067 is a split structure for easy disassembly and assembly. A fixed edge 3068 is constructed on the adjustment sleeve 3067, and the fixed edge 3068 is fixedly mounted outside the conveying cylinder 3031. The adjusting ring 3065 of this embodiment is movably connected between the adjusting sleeve 3067 and the conveying cylinder 3031. The adjusting ring 3065 is fixedly connected to one end of the second mounting rod 3063 that is close to each other. Two connecting posts 3066 are symmetrically fixed on the adjusting ring 3065. Each connecting post 3066 extends out of the adjusting sleeve 3067 along the axial direction of the horizontal assembly cylinder 301. A locking cap 3069 is threadedly connected to the connecting post 3066. In this embodiment, by adjusting the relative positions of the two adjusting rings 3065 and the conveying cylinder 3031, the two adjusting rings 3065 drive all the second mounting rods 3063 between the two to move along the axial direction of the conveying cylinder 3031, thereby adjusting the staggered spacing between the first elastic crushing rod 3062 and the second elastic crushing rod 3064, thereby achieving the purpose of adjusting the crushing degree.

[0041] As a preferred embodiment of the present invention, Figure 7 , 8As shown in Figures 13-16, the adjustable elastic screen cylinder 307 includes an elastic mesh cylinder 311, two adapter seats 3071, two assembly rings 3072 and a plurality of assembly rods 3077. The two adapter seats 3071 are symmetrically arranged at the axial ends of the horizontal assembly cylinder 301, and each adapter seat 3071 is rotatably connected to the horizontal assembly cylinder 301 and the bidirectional conveying mechanism 303. The two assembly rings 3072 are respectively installed on the end faces of the two adapter seats 3071 close to each other, and an annular groove 3073 is constructed on the outer peripheral surface of each assembly ring 3072, and the axis of the annular groove 3073 coincides with the axis of the assembly ring 3072; an annular cover 309 is rotatably connected outside the assembly ring 3072, and a connecting joint 310 connected to the annular groove 3073 is constructed on the annular cover 309, and the annular cover 309 is detachably connected to the axial end of the horizontal assembly cylinder 301. The multiple assembly rods 3077 described in this embodiment are installed between two assembly rings 3072. These assembly rods 3077 are evenly arranged along the circumference of the assembly ring 3072, and these assembly rods 3077 are connected to the elastic net tube 311. The elastic net tube 311 of this embodiment includes multiple sleeve bodies 3111 evenly arranged along the circumference of the conveying cylinder 3031, each sleeve body 3111 extends along the axial direction of the conveying cylinder 3031, and the assembly rods 3077 are assembled in the corresponding sleeve body 3111, and the two ends of the assembly rods 3077 extend from the two ends of the sleeve body 3111 respectively. A mesh body 3112 is fixed between two adjacent sleeve bodies 3111, and the mesh body 3112 is an elastic metal net, which is generally formed by binding with thinner steel wire ropes. In this embodiment, a plurality of guide sleeves 3074 are uniformly constructed along the circumference of the inner wall of the assembly ring 3072, each guide sleeve 3074 extends radially outwardly along the assembly ring 3072, and a movable column 3075 is movably inserted in each guide sleeve 3074. One end of the movable column 3075 extending into the annular groove 3073 is connected to the assembly ring 3072 through a hard spring 3079, and the other end of the movable column 3075 is hinged with a connecting sleeve 3076, and the end of the assembly rod 3077 passes through the connecting sleeve 3076, and a fixing nut 3078 is threadedly connected to the end of the assembly rod 3077. The working principle and advantage of this embodiment are as follows: this embodiment synchronously passes hydraulic oil under the same pressure into the two connecting joints 310, so that the hydraulic oil with the same pressure entering the two annular grooves 3073 drives all the movable columns 3075 to move synchronously and with the same displacement, thereby making the radial length of the elastic mesh cylinder 311 synchronously reduced, and according to the different pressures of the hydraulic oil, the elastic mesh cylinders 311 of different cylinder diameters can be adjusted, so that the screening holes of the elastic mesh cylinder 311 reach a predetermined range, so as to discharge materials within a predetermined particle size range.In this embodiment, hydraulic oils of different pressures can be respectively introduced into the two annular grooves 3073, so that the radial length of one axial end of the elastic net cylinder 311 is greater than the radial length of the other end, thereby disturbing the material in the crushing chamber 312 to move from one end of the elastic net cylinder 311 to the other end, and then the pressure of the hydraulic oil in the low-pressure annular groove 3073 is increased, and the pressure of the hydraulic oil in the other annular groove 3073 is reduced, so that the large-diameter end and the small-diameter end of the elastic net cylinder 311 are alternated. After a period of time, the above action is repeated several times, and finally the purpose of sufficient crushing is achieved, and the effect of primary mixing is better.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A sludge recycling system for biological phosphorus removal from sewage, characterized by: It includes a vertical multi-bucket filter press, a drum dryer, a crushing and primary mixing device and a rotary drum mixer; the inlet end of the vertical multi-bucket filter press is connected to the outlet of the sludge pump, the dewatered sludge filtered by the vertical multi-bucket filter press is dried by the drum dryer, the dried sludge and the fermented straw are synchronously entered into the crushing and primary mixing device, and the outlet end of the crushing and primary mixing device is connected to the inlet end of the rotary drum mixer.

2. A sludge recycling system for biological phosphorus removal from sewage according to claim 1, characterized in that: The vertical multi-bucket filter press device includes a plurality of filter press buckets arranged in sequence along the vertical direction, a conducting channel is formed in the middle of these filter press buckets, the diameter of each filter press bucket gradually expands downward along the vertical direction, and a filter press space connected to the conducting channel is formed between two adjacent filter press buckets. The lower end of the filter press bucket located at the bottom is connected to the fixed seat, and the filter press bucket located at the top is connected to the vertical driving member through a transfer tube, and a conducting hose is connected to the transfer tube, and a first control valve is installed on the conducting hose.

3. A sludge recycling system for biological phosphorus removal from sewage according to claim 2, characterized in that: The filter press bucket includes a bucket-shaped body with a first insert tube and a second insert tube respectively constructed at the upper and lower ends of the middle part, the first insert tube and the second insert tube close to each other in adjacent bucket-shaped bodies are movably inserted together, and the two are connected via a connecting spring, a receiving cylinder is coaxially constructed on the outer periphery of each bucket-shaped body, a filter cylinder is installed at the lower end of the receiving cylinder, and the radial length of the inner peripheral wall of the filter cylinder is not less than the radial length of the outer peripheral wall of the receiving cylinder; an upper connecting pipe and a lower connecting pipe are respectively constructed at the ends of the bucket-shaped body located at the top and the bucket-shaped body at the bottom that are away from each other, the upper connecting pipe is connected to the transfer pipe, and a second control valve is installed on the lower connecting pipe.

4. The sludge recycling system for biological phosphorus removal from sewage according to claim 1 is characterized by: The crushing and primary mixing device comprises a horizontal assembly cylinder, an adjustable elastic screen cylinder and a bidirectional conveying mechanism which are coaxially arranged from the outside to the inside, the two ends of the bidirectional conveying mechanism respectively extend out of the axial ends of the horizontal assembly body, a first transmission wheel and a second transmission wheel are respectively installed at one end of the bidirectional conveying mechanism which is away from the adjustable elastic screen cylinder, and a crushing mechanism is arranged between the adjustable elastic screen cylinder and the bidirectional conveying mechanism.

5. A sludge recycling system for biological phosphorus removal from sewage according to claim 4, characterized in that: The bidirectional conveying mechanism includes a conveying cylinder coaxially arranged in a horizontal assembly cylinder, two ends of the conveying cylinder respectively extend out of the two ends of the horizontal assembly cylinder, and the conveying cylinder is rotatably connected to the two ends of the adjustable elastic screen cylinder, a group of discharge ports are opened in the middle of the conveying cylinder, a group of feed ports are opened at each end of the conveying cylinder, and spiral conveying blades with opposite rotation directions are symmetrically constructed on the inner wall of the conveying cylinder, each of the spiral conveying blades spirally extends from the discharge port along the axial direction of the conveying cylinder to the corresponding feed port, an adapter sleeve is rotatably connected on the conveying cylinder and located at each feed port, and a feed hopper is constructed on the adapter sleeve.

6. The sludge recycling system for biological phosphorus removal from sewage according to claim 4 is characterized by: The crushing mechanism includes a plurality of first crushing parts evenly arranged along the circumference of the bidirectional conveying mechanism, each of the first crushing parts is connected to the bidirectional conveying mechanism, and second crushing parts are arranged between adjacent first crushing parts. The two ends of these second crushing parts are respectively connected to two adjustment components, and each of the adjustment components is connected to the bidirectional conveying mechanism.

7. A sludge recycling system for biological phosphorus removal from sewage according to claim 6, characterized in that: The first crushing member includes a first mounting rod parallel to the axis of the bidirectional conveying mechanism, and a plurality of first elastic crushing rods are configured on the first mounting rod at intervals along its length direction; the second crushing member includes a second mounting rod parallel to the first mounting rod, and a plurality of second elastic crushing rods are configured on the second mounting rod at intervals along its length direction.

8. The sludge recycling system for biological phosphorus removal from sewage according to claim 7, characterized in that: The adjustment assembly includes an adjustment sleeve coaxially fixed to the outside of the bidirectional conveying mechanism, an adjustment ring is movably connected between the adjustment sleeve and the bidirectional conveying mechanism, the adjustment ring is fixedly connected to one end of the second mounting rod that is close to each other, two connecting columns are symmetrically fixed on the adjustment ring, each of the connecting columns extends out of the adjustment sleeve along the axial direction of the horizontal assembly cylinder, and a locking cap is threadedly connected to the connecting column.

9. The sludge recycling system for biological phosphorus removal from sewage according to claim 4, characterized in that: The adjustable elastic screen cylinder includes two adapter seats symmetrically arranged at the axial ends of the horizontal assembly cylinder, each of the adapter seats is rotatably connected to the horizontal assembly cylinder and the two-way conveying mechanism, and an assembly ring is respectively installed on the end faces of the two adapter seats that are close to each other, and an annular groove coinciding with the axis of the assembly ring is constructed on the outer circumferential surface of each assembly ring, an annular sealing cover is rotatably connected to the outside of the assembly ring, and a connecting joint connected to the annular groove is constructed on the annular sealing cover, and the annular sealing cover is detachably connected to the axial end of the horizontal assembly cylinder, and a plurality of assembly rods are installed between the two assembly rings, and these assembly rods are evenly arranged along the circumference of the assembly ring, and these assembly rods are connected to the elastic mesh cylinder.

10. A sludge recycling system for biological phosphorus removal from sewage according to claim 9, characterized in that: A plurality of guide sleeves are uniformly constructed on the inner circumferential wall of the assembly ring along its circumference, each of the guide sleeves extends outward along the radial direction of the assembly ring, a movable column is movably inserted in each guide sleeve, one end of the movable column extending into the annular groove is connected to the assembly ring through a hard spring, the other end of the movable column is hinged with a connecting sleeve, the end of the assembly rod passes through the connecting sleeve, and a fixing nut is threadedly connected to the end of the assembly rod.

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