Sludge reduction system

Abstract

The embodiment of the utility model provides a sludge reduction system and relates to the technical field of sludge treatment. The sludge reduction system comprises a sludge tank, sludge in the sludge tank is pumped into a primary dehydrator for dehydration, a discharge port of the primary dehydrator is connected with a feed port of a screw conveyor, a discharge port at one end of the screw conveyor is connected with a feed port of an electroosmosis dehydrator, a discharge port of the electroosmosis dehydrator is connected with a feed end of an air drying mechanism, and a discharge port of the air drying mechanism is connected with a discharge port of a discharge port of the air drying mechanism. A supporting plate is connected to the air-drying mechanism, and a movable air-drying assembly is installed on the upper side of the supporting plate. According to the sludge air-drying device, the movable fan is promoted to air-dry sludge through rotation of the lead screw, meanwhile, the air-drying efficiency is improved by combining the air-drying fans arranged on the two sides of the supporting plate in a staggered mode, then the air cylinder drives the moisture-absorbing silica gel to descend to make contact with the sludge just entering the conveying belt, moisture on the sludge is absorbed, and the air-drying efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge treatment, in particular to a sludge reduction system. Background Art

[0002] The number of sewage treatment facilities has also increased rapidly. These sewage treatment facilities have generated a large amount of residual sludge. The current sludge disposal methods include landfill, land utilization, incineration and building material utilization. All disposal methods require the sludge moisture content to be 60% or less. However, after conventional mechanical dehydration, the sludge moisture content is generally around 80%. Therefore, it must be deeply dehydrated or dried. The high-pressure dehydration and low-temperature drying currently suitable for sewage treatment plants can reduce the moisture content to below 60%. However, high-pressure dehydration requires the addition of chemicals to condition the sludge, affecting its outlet; and low-temperature drying has high energy consumption.

[0003] Electro-osmosis dehydration technology is an emerging sludge deep dehydration technology. Its basic principle is to use an external DC electric field to make negatively charged sludge particles and positively charged water move in opposite directions to achieve the separation of mud and water in the sludge. Through electro-osmosis dehydration, the moisture content of sludge can be reduced from 80% to below 60%. No chemicals need to be added during the process, which does not affect subsequent treatment and disposal; the energy consumption is lower than low-temperature drying, which is particularly suitable for sewage treatment plants.

[0004] Using electro-osmosis dehydration, the dehydration section from 80% to 60% moisture content is more economical, and further reducing the moisture content requires higher energy consumption. The sludge after electro-osmosis dehydration is in the form of thin sheets with a thickness of about 2 mm, high porosity, and a temperature of about 40~50°C, which is very conducive to ventilation and drying without the need for heating.

[0005] However, after dehydration by electro-osmosis, the sludge needs to be forcedly ventilated, and most of the existing ventilation methods use fans to generate wind to remove moisture from the sludge. The fans in the prior art are usually fixed in a certain place, which is not convenient for quickly drying the sludge and reduces the efficiency of drying. Utility Model Content

[0006] The utility model aims to provide a sludge reduction system which can avoid the need for forced ventilation of the sludge after dehydration by electro-osmosis. Most of the existing ventilation methods use fans to generate wind to remove moisture from the sludge, and the fans in the prior art are usually fixed in a certain place, which is not convenient for quickly drying the sludge and reduces the drying efficiency.

[0007] The utility model provides a sludge reduction system, comprising a sludge pool, wherein the sludge in the sludge pool is pumped to a preliminary dehydrator for dehydration, the discharge port of the preliminary dehydrator is connected to the feed port of a screw conveyor, the discharge port at one end of the screw conveyor is connected to the feed port of an electro-osmosis dehydrator, the discharge port of the electro-osmosis dehydrator is connected to the feed end of an air-drying mechanism, the air-drying mechanism is connected to a support plate, and a movable air-drying component is installed on the upper side of the support plate.

[0008] In a specific embodiment, the air-drying mechanism comprises a conveyor belt having a plurality of mesh holes.

[0009] In a specific embodiment, the discharge port of the conveyor belt is connected to the feed port of the sludge storage bin.

[0010] In a specific embodiment, the mobile air-drying component includes a screw rod rotatably arranged on the upper side of the support plate, and the screw rod is threadedly connected to one end of the mobile fan.

[0011] In a specific implementation manner, a limiting rod is installed on the support plate located on the upper side of the screw rod, and one end of the mobile fan is slidably connected to the limiting rod.

[0012] In a specific embodiment, a plurality of inclined air-drying fans are installed on both sides of the support plate, and the air-drying fans on both sides are staggered.

[0013] In a specific embodiment, a slide groove is symmetrically provided at one end of the support plate, a rectangular plate is slidably arranged in the slide groove, and a hygroscopic silica gel layer is arranged in the rectangular plate.

[0014] In a specific embodiment, a cylinder is installed on one side of the support plate, and a piston end of the cylinder is connected to one side of the rectangular plate.

[0015] In a specific implementation, a slide rail is provided on one side of the two slide grooves, a hollow tube is slidably connected inside the two slide rails, an opening is opened on the upper side of the hollow tube, a plurality of air outlet pipes are provided on the lower side of the hollow tube, and a plurality of heating tubes are installed on both sides of the hollow tube.

[0016] In a specific implementation manner, clamping plates are provided on both sides of the opening on the upper side of the hollow tube, and the distance between the two clamping plates is adapted to the size of the mobile fan.

[0017] Compared with the prior art, the sludge reduction system provided by the present utility model has the following advantages:

[0018] 1. The utility model does not store and ferment the primary dehydrated sludge entering the electro-osmosis machine in a silo, nor does it squeeze and transport it through a sludge pump. The sludge has low electrical conductivity, and the energy consumption of the electro-osmosis dehydrator is reduced. The mud cake after electro-osmosis dehydration is dried using a forced ventilation drying method, which has a significant energy-saving effect and produces less odor. The sludge after electro-osmosis dehydration is in the form of thin flakes and does not need to be crushed before entering the air-drying mechanism. No chemicals are added during the process, and there is no secondary pollution. Subsequent treatment and disposal are not restricted, thereby achieving environmental protection and energy saving, low treatment cost, no secondary pollution, flexibility, and strong practicality.

[0019] 2. The utility model drives the mobile fan to air-dry the sludge through the rotation of the screw rod, and at the same time combines with the air-drying fans staggered on both sides of the support plate to improve the air-drying efficiency. Then the cylinder descends with the hygroscopic silica gel to contact the sludge just entering the conveyor belt, absorbs moisture on the sludge, and further enhances the air-drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structural system of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the air-drying mechanism of an embodiment of the utility model;

[0023] Figure 3 This is the second schematic diagram of the air-drying mechanism structure of the embodiment of the utility model;

[0024] Figure 4 A schematic diagram of the conveyor belt structure of an embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the mobile air-drying mechanism of an embodiment of the utility model;

[0026] Figure 6 It is a schematic side view of the support plate structure of an embodiment of the utility model;

[0027] Figure 7 This is a schematic diagram of a rectangular plate structure of an embodiment of the utility model;

[0028] Figure 8 This is a schematic diagram of the hollow tube structure of an embodiment of the utility model.

[0029] icon:

[0030] 1. Sludge tank; 2. Preliminary dehydrator; 3. Screw conveyor; 4. Electro-osmosis dehydrator; 5. Air drying mechanism; 51. Conveyor belt; 52. Mesh; 6. Sludge storage bin; 7. Support plate; 71. Air drying fan; 72. Slide; 73. Cylinder; 74. Rectangular plate; 75. Hygroscopic silica gel layer; 76. Slide rail; 8. Mobile air drying assembly; 81. Screw rod; 82. Limit rod; 83. Mobile fan; 9. Hollow tube; 91. Air outlet pipe; 92. Heating tube; 93. Pallet. DETAILED DESCRIPTION

[0031] After dehydration through electro-osmosis, the sludge needs to be forcedly ventilated, and most of the existing ventilation methods use fans to generate wind to remove moisture from the sludge. The fans in the prior art are usually fixed at a certain location, which is not convenient for quickly drying the sludge, reducing the efficiency of drying. Therefore, after research, a sludge reduction system is provided. When in use, the rotation of the screw rod prompts the mobile fan to dry the sludge, and at the same time, the drying fans staggered on both sides of the support plate are combined to improve the efficiency of drying. Then, the cylinder with hygroscopic silica gel descends to contact the sludge that has just entered the conveyor belt, absorbing moisture from the sludge, thereby solving the above defects.

[0032] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] Please refer to Figure 1-Figure 8 The embodiment of the utility model provides a sludge reduction system, including a sludge pool 1, the sludge in the sludge pool 1 is pumped to a preliminary dehydrator 2 for dehydration, the discharge port of the preliminary dehydrator 2 is connected to the feed port of a screw conveyor 3, the discharge port of the preliminary dehydrator 2 is directly opposite to the feed port of the screw conveyor 3, the feed port of the screw conveyor 3 is in the middle position in the length direction, the two ends of the screw conveyor 3 are respectively provided with discharge ports, the discharge port at one end of the screw conveyor 3 is connected to the feed port of an electro-osmosis dehydrator 4, the discharge port of the electro-osmosis dehydrator 4 is connected to the feed end of an air-drying mechanism 5, the air-drying mechanism 5 is used to force the dehydrated sludge to be air-dried, the electro-osmosis dehydrator 4 preferably adopts a rotary drum type electro-osmosis dehydrator 4, the anode of the rotary drum type electro-osmosis dehydrator 4 adopts a rotary drum type, and the cathode adopts a crawler type, the sludge after electro-osmosis dehydration is in the form of flakes, and does not need to be crushed before entering the air-drying bin.

[0034] Among them, the air-drying mechanism 5 includes a conveyor belt 51, and a plurality of mesh holes 52 are opened on the conveyor belt 51. Wind can pass through the mesh holes 52 to improve the air-drying efficiency of the sludge. The discharge port of the conveyor belt 51 is connected with the feed port of the sludge storage bin 6, and the air-dried sludge enters the sludge storage bin 6 for storage. Since the conveyor belt 51 receives the flaky sludge transported out from the electro-osmosis dehydrator 4, the sludge will not fall when passing through the mesh holes 52 of the conveyor belt 51.

[0035] Among them, the air-drying mechanism 5 is connected to the support plate 7, and multiple inclined air-drying fans 71 are installed on both sides of the support plate 7. The air-drying fans 71 on both sides are staggered, and the air outlets of the air-drying fans 71 are downward to dry the sludge on the conveyor belt 51.

[0036] Furthermore, a mobile air-drying component 8 is installed on the upper side of the support plate 7. The mobile air-drying component 8 includes a screw rod 81 rotatably arranged on the upper side of the support plate 7. The screw rod 81 is driven by a motor. Since the screw rod 81 is threadedly connected to one end of the mobile fan 83, when the screw rod 81 rotates, the mobile fan 83 moves to air-dry the sludge, thereby assisting the air-drying operation of the air-drying fan 71.

[0037] A limiting rod 82 is installed on the support plate 7 located on the upper side of the screw rod 81, and one end of the mobile fan 83 is slidably connected to the limiting rod 82. The mobile fan 83 is restricted by the limiting rod 82 to enable the mobile fan 83 to move stably horizontally.

[0038] Furthermore, a slide groove 72 is symmetrically opened at one end of the support plate 7, a rectangular plate 74 is slidably set in the slide groove 72, a hygroscopic silica gel layer 75 is set in the rectangular plate 74, the rectangular plate 74 is located at the feeding end of the conveyor belt 51, and the hygroscopic silica gel layer 75 is brought into contact with the sludge by sliding downward through the rectangular plate 74. The hygroscopic silica gel layer 75 has a large number of micropores and gaps inside, which can absorb and store a large amount of moisture, thereby accelerating the drying of the sludge.

[0039] A cylinder 73 is installed on one side of the support plate 7 , and a piston end of the cylinder 73 is connected to one side of the rectangular plate 74 , so that the hygroscopic silica gel layer 75 can move up and down through the cylinder 73 .

[0040] In order to enable the hygroscopic silica gel layer 75 to be used for a long time, a slide rail 76 is provided on one side of the two slide grooves 72, and the hollow tube 9 is slidably connected inside the two slide rails 76. An opening is provided on the upper side of the hollow tube 9 for air intake, and a plurality of air outlet pipes 91 are provided on the lower side of the hollow tube 9. A plurality of heating tubes 92 are installed on both sides of the hollow tube 9 for releasing heat after being energized. After the hollow tube 9 is slid to the upper side of the rectangular plate 74, the mobile fan 83 is moved to the opening, and the wind force generated by the mobile fan 83 enters the hollow tube 9 and is heated, and the hot air is blown toward the hygroscopic silica gel layer 75, so that the hygroscopic silica gel layer 75 is regenerated for its reuse.

[0041] In addition, clamping plates 93 are provided on both sides of the opening formed on the upper side of the hollow tube 9, and the distance between the two clamping plates 93 matches the size of the mobile fan 83, so as to make the mobile fan 83 correspond to the opening.

[0042] In summary, the sludge reduction system of the embodiment of the utility model has the following working principle: the residual sludge or concentrated sludge in the sludge pool 1 is transported to the preliminary dehydrator 2 for dehydration, the preliminary dehydrated sludge is transported by the screw conveyor 3 to the electro-osmosis dehydrator 4 for further dehydration, and after dehydration, it enters the conveyor belt 51, and is air-dried by the air-drying fan 71 and the mobile fan 83. At the same time, the cylinder 73 descends with the hygroscopic silica gel layer 75 to absorb moisture from the sludge, thereby improving the air-drying efficiency.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sludge reduction system, comprising a sludge tank (1), characterized in that: The sludge in the sludge pool (1) is pumped to a preliminary dehydrator (2) for dehydration; the discharge port of the preliminary dehydrator (2) is connected to the feed port of a screw conveyor (3); the discharge port at one end of the screw conveyor (3) is connected to the feed port of an electro-osmosis dehydrator (4); the discharge port of the electro-osmosis dehydrator (4) is connected to the feed end of an air-drying mechanism (5); a support plate (7) is connected to the air-drying mechanism (5); and a movable air-drying component (8) is installed on the upper side of the support plate (7).

2. The sludge reduction system according to claim 1, characterized in that: The air-drying mechanism (5) comprises a conveyor belt (51), and a plurality of mesh holes (52) are provided on the conveyor belt (51).

3. The sludge reduction system according to claim 2, characterized in that: The discharge port of the conveyor belt (51) is connected to the feed port of the sludge storage bin (6).

4. The sludge reduction system according to claim 1, characterized in that: The mobile air-drying component (8) comprises a screw rod (81) rotatably arranged on the upper side of the support plate (7), and the screw rod (81) is threadedly connected to one end of the mobile fan (83).

5. The sludge reduction system according to claim 4, characterized in that: A limiting rod (82) is installed on the support plate (7) located on the upper side of the screw rod (81), and one end of the movable fan (83) is slidably connected to the limiting rod (82).

6. The sludge reduction system according to claim 5, characterized in that: A plurality of inclined air-drying fans (71) are installed on both sides of the support plate (7), and the air-drying fans (71) on both sides are arranged in a staggered manner.

7. The sludge reduction system according to claim 6, characterized in that: A sliding groove (72) is symmetrically provided at one end of the support plate (7), a rectangular plate (74) is slidably arranged in the sliding groove (72), and a moisture-absorbing silica gel layer (75) is arranged in the rectangular plate (74).

8. The sludge reduction system according to claim 7, characterized in that: A cylinder (73) is installed on one side of the support plate (7), and a piston end of the cylinder (73) is connected to one side of the rectangular plate (74).

9. The sludge reduction system according to claim 8, characterized in that: A slide rail (76) is provided on one side of the two slide grooves (72), and a hollow tube (9) is slidably connected inside the two slide rails (76). An opening is provided on the upper side of the hollow tube (9), and a plurality of air outlet pipes (91) are provided on the lower side of the hollow tube (9). A plurality of heating tubes (92) are installed on both sides of the hollow tube (9).

10. The sludge reduction system according to claim 9, characterized in that: Clamps (93) are provided on both sides of the opening on the upper side of the hollow tube (9), and the distance between the two clamps (93) is adapted to the size of the mobile fan (83).

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