Sludge concentration and flocculation integrated device fully utilizing flocculant

Abstract

The application discloses a sludge concentration and flocculation integrated device which fully utilizes flocculants, relates to the technical field of sludge concentration treatment and flocculant recycling, and comprises a working assembly, the working assembly comprises a material tank, a filtrate backflow pipe is fixedly installed on one side of the material tank, a concentration chamber is integrally formed in the inside of the material tank, a connecting frame is fixedly installed in the inside of the material tank, an inclined plate is fixedly installed on one side of the connecting frame, and a flocculation chamber is arranged on the lower surface of the inclined plate. When the mud-water mixture continuously enters the device, the PVC floating body and the overflow tank float on the top of the device, and the supernatant flows out from the serrated overflow weir. When the mud-water mixture intermittently enters the device, after the mud feeding is stopped, the PVC floating body and the overflow tank gradually decrease along with the water drainage, the decreasing speed is controlled by adjusting the water drainage flow, the sludge is prevented from being taken out of the concentration chamber, and the water content of the sludge in the concentration chamber can be maximally reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sludge concentration treatment and flocculant recycling, and in particular to a sludge concentration and flocculation integrated device which fully utilizes flocculants. Background Art

[0002] The stacked spiral sludge dewatering machine, also known as the spiral stacker, is easy to use and can operate continuously. It is widely used for sludge dewatering in sewage treatment plants. The spiral stacker sludge filter press dewatering process consists of two steps: sludge flocculation and sludge filter press. The sludge flocculation process requires the addition of a flocculant, typically polyacrylamide cations. However, the water discharged after flocculation inevitably contains a large amount of unreacted flocculant. This water is generally discharged to the wastewater treatment plant regulating tank for reprocessing, and the unreacted flocculant in this return water is wasted. In vertical flow sludge thickening tanks, after intermittent operation, the sludge settles by gravity for a certain period of time, and then the supernatant is discharged by opening a discharge valve at a certain height. Due to the disturbance of the water flow during the discharge process, some sludge is carried out with the water flow. To reduce the outflow of sludge, more clear water is generally left in the tank, which affects the sludge concentration effect. To improve the utilization efficiency of the flocculant and the convenience of sludge concentration and flocculation, the present invention provides an integrated sludge concentration and flocculation device that fully utilizes the flocculant. The existing technology has the following problems:

[0003] 1. The flocculant in the filtrate after filtration in the existing screw press is not recycled, and the flocculant utilization efficiency is low, resulting in a large amount of waste and increased operating costs.

[0004] 2. The existing intermittent sludge thickening tank does not drain water through the overflow weir, so the sludge easily flows out with the drainage and the clean water cannot be completely drained. In addition, no flocculant is added, and the sludge thickening effect is poor. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a sludge concentration and flocculation integrated device that integrates sludge concentration and flocculation and fully utilizes the filter press reflux containing a large amount of flocculant for preliminary sludge flocculation. The technical solution adopted by the present invention is:

[0006] An integrated sludge concentration and flocculation device that makes full use of flocculants includes a working component, which includes a material tank, a filtrate return pipe is fixedly installed on one side of the material tank, a concentration chamber is integrally formed inside the material tank, a connecting frame is fixedly installed inside the material tank, an inclined plate is fixedly installed on one side of the connecting frame, a flocculation chamber is arranged below the inclined plate, and a clean water overflow channel is arranged between the inclined plate and the inner wall of the material tank.

[0007] A further improvement of the technical solution of the present invention is that: the upper end of the filtrate reflux pipe is connected to the outlet of the filtrate press of the snail press. Since flocculant is added during the filtration process of the snail press, the filtrate of the snail press contains a large amount of unreacted flocculant. The filtrate containing flocculant enters the flocculation chamber through the filtrate reflux pipe to perform preliminary flocculation on the concentrated sludge, and the flocculant in the filtrate is recovered and utilized.

[0008] A further improvement of the technical solution of the present invention is that: an overflow component is provided in the material tank, which floats on the water surface in the material tank and can rise and fall with changes in water level. It includes a PVC annular float, an overflow trough and a serrated overflow weir. The outer diameter of the PVC annular float is slightly smaller than the inner diameter of the material tank. The overflow trough is fixed on the PVC annular float. A water outlet is provided at the bottom of the overflow trough. The water outlet is connected to the outside of the material tank through a corrosion-resistant hose to discharge the overflow water into the wastewater regulating tank.

[0009] A further improvement of the technical solution of the present invention is that: the angle of the inclined plate at the bottom of the concentration chamber is greater than or equal to 60 degrees, the concentrated sludge can flow into the flocculation chamber by gravity, and a clean water overflow channel is set between the top of the inclined plate and the wall of the material tank, so that the flocculated clean water and fermentation waste gas flow upward along the clean water overflow channel and move upward along the wall of the concentration chamber, effectively preventing the flocculated clean water and fermentation waste gas from rising from the middle to cause disturbance and affect the sedimentation effect of the concentrated sludge.

[0010] A further improvement of the technical solution of the present invention is that: a stirring assembly is provided on the top of the material tank, and the stirring assembly includes a mounting base, the mounting base is fixedly mounted on the top of the material tank, a center tube is fixedly mounted on the bottom of the mounting base, a fixing bolt is threadedly connected to the top of the mounting base, a motor is fixedly mounted on the top of the mounting base, a connecting shaft is fixedly mounted on the output end of the motor, and a rotating rod is sleeved on the lower end of the connecting shaft, the rotating rod passes through the center tube and runs through the interior of the concentration chamber and the flocculation chamber, a stirring blade is connected to the lower end of the rotating rod, and the bottom end of the rotating rod is rotatably connected to a limit device to prevent the stirring rod from swinging laterally during the stirring process.

[0011] A further improvement of the technical solution of the present invention is that: a mud inlet pipe is installed on the top of the material tank, and the outlet end of the mud inlet pipe is inserted into the central tube from the side of the top of the central tube, and the mud is fed into the concentration chamber through the central tube. A mud discharge pipe is installed at the bottom of the flocculation chamber, and the mud discharge pipe is externally connected to a mud discharge pump to lift the preliminarily flocculated sludge to the flocculation tank of the snail press, and after further flocculation by adding chemicals, it enters the snail press for filtration.

[0012] Due to the adoption of the above technical solution, the present invention has the following technical advancements compared to the prior art:

[0013] 1. The present invention provides an integrated sludge concentration and flocculation device that fully utilizes flocculants. The sludge concentration chamber 34 and the flocculation chamber 36 overlap to reduce floor space. The sludge in the concentration chamber 34 flows into the flocculation chamber 36 by gravity, without the need for power, thus reducing energy consumption.

[0014] 2. The present invention provides an integrated sludge concentration and flocculation device that fully utilizes flocculants. Since flocculants are added during the filter pressing process of the screw press, the filtrate of the screw press contains a large amount of unreacted flocculants. The filtrate containing flocculants enters the flocculation chamber 36 through the filtrate return pipe 35 to perform preliminary flocculation on the concentrated sludge, thereby fully recovering and utilizing the flocculants in the filtrate.

[0015] 3. The present invention provides an integrated sludge concentration and flocculation device that fully utilizes flocculants. The overflow trough 52 is fixed on the PVC annular float 51 to form an overflow assembly 5. The overflow assembly 5 is connected to the external drainage hose 1. The overflow assembly 5 floats on the water surface. The sludge concentration can realize automatic switching between continuous operation and intermittent operation. When the mud-water mixture continuously enters the device, the overflow assembly 5 floats on the top of the material tank 31, and the supernatant flows out from the serrated overflow weir 54. When the mud-water mixture intermittently enters the device and the mud inlet pipe 64 stops feeding mud, the PVC annular float 51 and the overflow trough 52 gradually lower as the drainage proceeds. The descending speed of the overflow assembly 5 can be controlled by adjusting the flow regulating valve 2 to prevent the sludge from being carried out of the concentration chamber 34, thereby minimizing the water content of the sludge in the concentration chamber 34.

[0016] 4. The present invention provides an integrated sludge concentration and flocculation device that fully utilizes flocculants. The clean water overflow channel 37 is arranged between the inclined plate 33 and the inner wall of the material tank 31. The water after filter pressing enters the flocculation chamber 36 from the side. The sludge is initially flocculated under the action of the residual flocculant in the filter pressing water and further concentrated. The clear liquid produced by flocculation and the gas produced by the fermentation of the sludge in the flocculation chamber 36 move upward from the clean water overflow channel 37 arranged on the side of the flocculation chamber 36, effectively preventing the clean water or gas from moving upward from the middle to affect the sludge sedimentation.

[0017] 5. The present invention provides an integrated sludge concentration and flocculation device that fully utilizes flocculants. Through the combined action of a connecting frame 32 and an inclined plate 33, the connecting frame 32 is fixedly installed inside a material tank 31. The connecting frame 32 can fix the inclined plate 33. The inclined plate 33 at the bottom of the concentration chamber 34 is tilted downward at a certain angle, which is not less than 60 degrees. The concentrated sludge can automatically slide into the flocculation chamber 36 under the action of gravity, without the need for power, thus saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the sludge concentration and flocculation integrated device that fully utilizes the flocculant of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the stirring assembly of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the stirring mechanism of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the working components of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the connection assembly of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the overflow component of the present invention.

[0024] In the figure: 1. Corrosion-resistant hose; 2. Flow regulating valve; 3. Working assembly; 31. Material tank; 32. Connecting frame; 33. Inclined plate; 34. Concentrating chamber; 35. Filtrate return pipe; 36. Flocculation chamber; 37. Clean water overflow channel; 4. Stirring assembly; 41. Mounting base; 42. Fixing bolt; 43. Motor; 44. Connecting shaft; 45. Center tube; 5. Overflow assembly; 51. PVC annular float; 52. Overflow trough; 53. Overflow outlet; 54. Overflow weir; 62. Mud discharge pump; 63. Mud discharge pipe; 64. Mud inlet pipe; 7. Stirring mechanism; 71. Rotating rod; 72. Limiting device; 73. Stirring blade. DETAILED DESCRIPTION

[0025] The present invention is described in further detail below in conjunction with the embodiments:

[0026] Example 1

[0027] like Figure 1-6 As shown, the present invention provides an integrated sludge concentration and flocculation device that fully utilizes flocculants, including a working component 3, which includes a material tank 31. A filtrate return pipe 35 is fixedly installed on one side of the material tank 31, and a concentration chamber 34 is integrally formed inside the material tank 31. A connecting frame 32 is fixedly installed inside the material tank 31, and an inclined plate 33 is fixedly connected to one side of the connecting frame 32. A flocculation chamber 36 is provided below the connecting frame 32, and a clean water overflow channel 37 is provided between the inclined plate 33 and the inner wall of the material tank 31. The upper end of the filtrate return pipe 35 is connected to the outlet of the filtrate press of the snail press. Since polyacrylamide cationic flocculant is added during the filtration process of the snail press, the filtrate of the snail press contains a large amount of unreacted flocculant. The filtrate containing the flocculant enters the flocculation chamber 36 through the filtrate return pipe 35 to perform preliminary flocculation on the concentrated sludge, and the flocculant in the filtrate is recovered and utilized.

[0028] In this embodiment, the water after the screw press is filtered enters the flocculation chamber 36 from the side. The sludge is initially flocculated under the action of the residual flocculant in the filtered water and further concentrated. The clear liquid produced by flocculation and the gas produced by the fermentation of the sludge in the flocculation chamber 36 move upward from the clean water overflow channel 37 set on the side of the flocculation chamber 36, effectively preventing the clean water or gas from moving upward from the middle to affect the sludge sedimentation. The inclined plate 33 is tilted downward at a certain angle, which is not less than 60 degrees. The concentrated sludge can automatically slide into the flocculation chamber 36 under the action of gravity without providing power, saving energy.

[0029] Example 2

[0030] like Figure 1-6 As shown, based on Example 1, the present invention provides a technical solution: preferably, an overflow component 5 is provided in the material tank 31, floating on the water surface in the material tank 31, and can rise and fall with the change of water level, including a PVC annular float 51, an overflow trough 52 and a sawtooth overflow weir 54, the outer diameter of the PVC annular float 51 is slightly smaller than the inner diameter of the material tank 31, the overflow trough 52 is fixed on the PVC annular float 51, and a water outlet 53 is provided at the bottom of the overflow trough 52, and the water outlet is connected to the outside of the material tank 31 through a corrosion-resistant hose 1. A flow regulating valve 2 is installed on the corrosion-resistant hose 1. The angle of the connecting frame 32 at the bottom of the concentration chamber 34 is greater than or equal to 60 degrees. The concentrated sludge can flow into the flocculation chamber 36 by gravity. A clean water overflow channel 37 is set between the top of the connecting frame 32 and the wall of the material tank 31, so that the clean water and fermentation waste gas after flocculation flow upward along the bottom of the connecting frame 32 and move upward along the inner wall of the concentration chamber 34, effectively preventing the clean water and fermentation waste gas after flocculation from rising from the middle and affecting the sedimentation effect of the concentrated sludge. A stirring component 4 is set on the top of the material tank 31. The assembly 4 includes a mounting base 41, which is fixedly mounted on the top of the material tank 31. A fixing bolt 42 is threadedly connected to the top of the mounting base 41. A motor 43 is fixedly mounted on the top of the mounting base 41. A connecting shaft 44 is fixedly mounted on the output end of the motor 43. A center tube 45 is fixedly mounted on the bottom of the mounting base 41. A mud inlet pipe 64 is installed on the top of the material tank 31. The outlet end of the mud inlet pipe 64 is inserted into the center tube 45 from the top side of the center tube 45, and the mud is fed into the concentration chamber 34 through the center tube 45. A mud discharge pipe 63 is installed at the bottom of the flocculation chamber 36. The mud discharge pipe 63 is externally connected to a mud discharge pump 62 to lift the preliminarily flocculated sludge to the flocculation tank of the screw press, add flocculant for further flocculation, and then enter the screw press for filtration. A stirring mechanism 7 is provided inside the material tank 31. The stirring mechanism 7 includes a rotating rod 71. The rotating rod 71 passes through the interior of the concentration chamber 34 and the flocculation chamber 36. The lower end of the rotating rod 71 is connected to a stirring blade 73. The bottom end of the rotating rod 71 is fixedly connected to a limit device 72 to prevent the stirring rod from swinging laterally during the stirring process.

[0031] In this embodiment, the overflow assembly 5 floats on the water surface and includes a PVC annular float 51, an overflow trough 52 and a serrated overflow weir 54. The sludge concentration can realize switching operation between continuous operation and intermittent operation. When the mud-water mixture continuously enters the device, the overflow assembly 5 floats on the top of the material tank 31, and the supernatant flows out from the serrated overflow weir 54. When the mud-water mixture intermittently enters the device and the mud inlet pipe 64 stops feeding mud, the overflow assembly 5 gradually lowers as the drainage proceeds. The descending speed of the overflow assembly is controlled by adjusting the flow regulating valve to prevent the sludge from being carried out of the concentration chamber 34, thereby minimizing the water content of the sludge in the concentration chamber 34.

[0032] The following is a detailed description of the working principle of the sludge concentration and flocculation integrated device that fully utilizes flocculants.

[0033] like Figure 1-6 As shown, the sludge concentration chamber 34 overlaps with the flocculation chamber 36 to reduce floor space. The sludge in the concentration chamber 34 flows into the flocculation chamber 36 by gravity, without the need for power, thus reducing energy consumption. Because flocculants are added during the filtration process of the screw press, the filtrate of the screw press contains a large amount of unreacted flocculants. The filtrate containing flocculants enters the flocculation chamber 36 through the filtrate return pipe 35 to perform preliminary flocculation on the concentrated sludge, fully recycling the flocculants in the filtrate. The overflow trough 52 with a sawtooth overflow weir 54 is fixed on the PVC annular float 51 to form an overflow assembly 5. The overflow assembly 5 is connected to an external drainage hose and floats on the water surface. The sludge concentration can realize automatic switching between continuous operation and intermittent operation. When the mud-water mixture continuously enters the device, the overflow assembly 5 floats on the top of the material tank 31, and the supernatant flows out from the sawtooth overflow weir 54. When the mud-water mixture intermittently enters the device and the mud inlet pipe 64 stops feeding mud, the overflow assembly 5 gradually lowers as the drainage proceeds. The descending speed of the overflow assembly 5 can be controlled by adjusting the flow regulating valve 2 to prevent the sludge from being carried out of the concentrating chamber 34, thereby minimizing the water content of the sludge in the concentrating chamber 34. The clean water overflow channel 37 is arranged between the inclined plate 33 and the inner wall of the material tank 31. The water after pressure filtration enters the flocculation chamber 36 from the side. The sludge is initially flocculated and further concentrated under the action of the residual flocculant in the pressure filtration water. The clear liquid produced by flocculation and the gas produced by the fermentation of the sludge in the flocculation chamber 36 move upward from the clean water overflow channel 37 arranged on the side of the flocculation chamber 36, effectively preventing the clean water or gas from moving upward from the middle and affecting the sedimentation of the sludge. Under the joint action of the connecting frame 32 and the inclined plate 33, the connecting frame 32 is fixedly installed inside the material tank 31. The connecting frame 32 can fix the inclined plate 33. The inclined plate 33 at the bottom of the concentrating chamber 34 is tilted downward at a certain angle, which is not less than 60 degrees. The concentrated sludge can automatically slide into the flocculation chamber 36 under the action of gravity, without the need for power, thus saving energy.

[0034] The above generally describes the present invention in detail. However, it is obvious to those skilled in the art that modifications or improvements may be made based on the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A sludge concentration and flocculation integrated device that fully utilizes a flocculant, comprising a working component (3), characterized in that: The working assembly (3) includes a material tank (31), a filtrate return pipe (35) is fixedly installed on one side of the material tank (31), a concentration chamber (34) is integrally formed inside the material tank (31), a connecting frame (32) is fixedly installed inside the material tank (31), an inclined plate (33) is fixedly connected to one side of the connecting frame (32), a flocculation chamber (36) is provided below the connecting frame (32), and a clean water overflow channel (37) is provided between the inclined plate (33) and the wall of the material tank (31); The upper end of the filtrate return pipe (35) is connected to the outlet of the filtrate press of the snail press. Since flocculants are added during the filtration process of the snail press, the filtrate press of the snail press contains a large amount of unreacted flocculants. The filtrate press containing the flocculants enters the flocculation chamber (36) through the filtrate return pipe (35) to perform preliminary flocculation on the concentrated sludge, and the flocculants in the filtrate press are recycled. The material tank (31) is provided with an overflow assembly (5), which floats on the water surface in the material tank (31) and can rise and fall with changes in the water level. The overflow assembly (5) comprises a PVC annular float (51), an overflow trough (52) and a sawtooth overflow weir (54). The outer diameter of the PVC annular float (51) is slightly smaller than the inner diameter of the material tank (31). The overflow trough (52) is fixed on the PVC annular float (51). A water outlet (53) is provided at the bottom of the overflow trough (52). The water outlet is connected to the outside of the material tank (31) through a corrosion-resistant hose (1). A flow regulating valve (2) is installed on the corrosion-resistant hose (1).

2. The integrated sludge concentration and flocculation device for fully utilizing flocculants according to claim 1 is characterized in that: The angle of the connecting frame (32) at the bottom of the concentration chamber (34) is greater than or equal to 60 degrees, and the concentrated sludge can flow into the flocculation chamber (36) by gravity. A clean water overflow channel (37) is set between the top of the connecting frame (32) and the wall of the material tank (31), so that the flocculated clean water and fermentation waste gas flow upward from the bottom of the connecting frame (32) along the clean water overflow channel (37) and move upward along the wall of the concentration chamber (34), effectively preventing the flocculated clean water and fermentation waste gas from rising from the middle and affecting the sedimentation effect of the concentrated sludge.

3. The integrated sludge concentration and flocculation device for fully utilizing flocculants according to claim 1 is characterized in that: A stirring assembly (4) is provided on the top of the material tank (31), and the stirring assembly (4) includes a mounting base (41), the mounting base (41) is fixedly mounted on the top of the material tank (31), a fixing bolt (42) is threadedly connected to the top of the mounting base (41), a motor (43) is fixedly mounted on the top of the mounting base (41), a connecting shaft (44) is fixedly mounted on the output end of the motor (43), and a center cylinder (45) is fixedly mounted on the bottom of the mounting base (41).

4. The integrated sludge concentration and flocculation device for fully utilizing flocculants according to claim 1 is characterized in that: A mud inlet pipe (64) is installed on the top of the material tank (31), and the outlet end of the mud inlet pipe (64) is inserted into the central tube (45) from the side of the top end of the central tube (45), and the mud is fed into the concentration chamber (34) through the central tube (45). A mud discharge pipe (63) is installed at the bottom of the flocculation chamber (36), and the mud discharge pipe (63) is externally connected to a mud discharge pump (62) to lift the initially flocculated sludge to the flocculation tank of the screw press machine, and after further flocculation by adding flocculants, the sludge is fed into the screw press machine for filtration.

5. The integrated sludge concentration and flocculation device for fully utilizing flocculants according to claim 1 is characterized in that: A stirring mechanism (7) is provided inside the material tank (31), and the stirring mechanism (7) includes a rotating rod (71). The rotating rod (71) runs through the interior of the concentration chamber (34) and the flocculation chamber (36). The lower end of the rotating rod (71) is connected to a stirring blade (73). The bottom end of the rotating rod (71) is fixedly connected to a limit device (72) to prevent the stirring rod from swinging laterally during the stirring process.

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