Stacked screw dehydrator capable of treating acidic sewage

Abstract

The utility model discloses a stacked screw dehydrator capable of treating acidic sewage, and belongs to the field of sludge treatment devices, the stacked screw dehydrator comprises a mixing system box body matched with the stacked screw dehydrator, a first box body in the mixing system box body is communicated with a feeding pipe, the first box body is provided with a first stirring assembly and an alkali dosing port, and the second box body is provided with a second stirring assembly. The second box body is provided with a second stirring assembly and a PAC dosing port, the third box body is provided with a third stirring assembly and a PAM dosing port, and the third box body is communicated with the stacked screw dehydrator through a mixing system blow-down pipe; the first box body is further communicated with a first box body blow-down pipe, the second box body is further communicated with a second box body blow-down pipe, and the third box body is further communicated with a third box body blow-down pipe. Through a mixing system box body formed by a plurality of box bodies connected in series, the pH value of alkali neutralization sewage is increased, a PAC medicament is added to help sewage coagulation, and a PAM medicament is added to realize alumen ustum, so that the treatment of acidic sewage is achieved.

Description

Technical Field

[0001] The present application belongs to the field of sludge treatment equipment, and more specifically, relates to a screw stacking dehydrator capable of treating acidic sewage. Background Art

[0002] The screw stack dewatering machine is also called a screw extrusion dewatering machine. It can achieve extrusion filtration of water-containing sludge mixture by screw extrusion to separate sludge from sewage.

[0003] Referring to a screw stacking dehydrator disclosed in the patent document with Chinese patent publication number CN107089788A, the following technical scheme is specifically disclosed: it comprises an electric control box and a frame, the electric control box is arranged on the right side of the frame, a flocculation mixing box is arranged on the front side of the electric control box, a stirring device is arranged on the upper side of the flocculation mixing box, the stirring device extends into the flocculation mixing box, a mud inlet device is arranged on the right side of the flocculation mixing box, a mud inlet is arranged on the lower side of the mud inlet device, an overflow port is arranged on the right side of the mud inlet, a feed pipe is arranged on the left side of the flocculation mixing box, a screw stacking main machine is arranged on the upper left side of the frame, a transmission motor is arranged on the left side of the screw stacking main machine, a rotating shaft is connected to the right side of the transmission motor, the rotating shaft penetrates the lower part of the screw stacking main machine and extends out of the right end of the screw stacking main machine, a shaft housing is arranged on the outer side of the rotating shaft, the feed pipe is connected to the shaft housing, a filtrate collecting box is arranged on the lower side of the screw stacking main machine, a drain port is arranged at the lower part of the filtrate collecting box, and a mud discharge pipe is arranged at the lower left corner of the screw stacking main machine.

[0004] At the same time, continue to refer to the patent document of Chinese Patent Publication No. CN116495967A, which discloses a screw stacking dewatering machine for sludge solid-liquid treatment, and specifically discloses the following technical scheme: it includes a mixing box, a dewatering box and a wastewater recovery box, the dewatering box is swingably installed on the upper end of the wastewater recovery box as a whole, a stirring and mixing component is provided in the mixing box, and a screw stacking dewatering component is provided in the dewatering box; the screw stacking dewatering component includes two groups of dewatering augers arranged in parallel, each group of dewatering augers includes a rotating shaft arranged parallel to the dewatering box, and a screw stacking sheet is fixedly connected to the peripheral wall of each rotating shaft, and the screw stacking sheet extends along the axial direction of the rotating shaft; a partition plate is provided in the dewatering box, and the two ends of the partition plate are fixed at the middle position of the longitudinal inner wall of the dewatering box, and the partition plate divides the space inside the dewatering box into a concentration area and a dewatering area; a plurality of concentration movable plates are provided in the concentration area.

[0005] It can be seen from the above-mentioned patent documents CN107089788A and CN116495967A that the mixing boxes used in conjunction with the screw dewatering machine are all single-box structures. The disadvantage of the single-box structure is that it is impossible to flexibly add and fully mix the reagents, and it is impossible to effectively treat acidic solid-liquid mixed sludge, which has certain limitations. Summary of the invention

[0006] The purpose of the present application is to provide a screw dehydrator that can treat acidic sewage. It can use a mixing system box composed of multiple series-connected boxes to increase alkali to neutralize the pH of the sewage, add PAC agents to help sewage coagulation, and add PAM agents to achieve alum floc, so as to achieve the treatment of acidic sewage.

[0007] To achieve the above objectives, this application is implemented through the following technical solutions:

[0008] The present application discloses a screw stacking dehydrator capable of treating acidic sewage, comprising a mixing system housing and the screw stacking dehydrator, wherein the screw stacking dehydrator has a screw stacking dehydrator motor, which can drive a spiral shaft in the screw stacking dehydrator to lift sludge to a sludge outlet, wherein the mixing system housing comprises a first housing, a second housing, and a third housing which are sequentially connected in series, wherein the first housing is connected to a feed pipe, the first housing has a first stirring assembly and an alkali dosing port, the second housing has a second stirring assembly and a PAC dosing port, the third housing has a third stirring assembly and a PAM dosing port, and the third housing is connected to the screw stacking dehydrator through a mixing system vent pipe; the first housing is also connected to a first housing vent pipe, the second housing is also connected to a second housing vent pipe, and the third housing is also connected to a third housing vent pipe.

[0009] As one of the preferred technical solutions of the present application, a first guide plate is provided at the connection position between the first box body and the second box body, and the first guide plate is located at the high liquid level of the first box body.

[0010] As one of the preferred technical solutions of the present application, a second guide plate is provided at the connection position between the second box body and the third box body, and the second guide plate is located at the high liquid level of the second box body.

[0011] As one of the preferred technical solutions of the present application, the second box body and the third box body are respectively provided with a liquid level sensor A and a liquid level sensor B. The liquid level sensor A and the liquid level sensor B are connected to the controller through electrical signals, and the controller is also connected to the first stirring assembly, the second stirring assembly, the third stirring assembly, and the screw dehydration motor through electrical signals.

[0012] Compared with the prior art, the beneficial effects of this application are:

[0013] The present application sets up a three-box three-mixing structure. Through the first box, the sludge pump and the dosing pump can be used to fully mix the sludge to be treated and the alkaline agent, thereby reducing the pH value of the sludge; the PAC agent delivered by the drug pump is fully mixed with the sludge through the stirring of the second box to achieve the coagulation effect; the PAM agent added by the drug pump is fully mixed with the treated sludge through the stirring device in the third box to form alum flowers, so that the subsequent screw stacking dehydrator can drive the internal spiral shaft to rotate under the action of the screw stacking dehydration motor, lift the delivered sludge to the sludge outlet, and the filtrate enters the filtrate tank at the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the main view of this application.

[0015] Figure 2 This is the front view of the hybrid system cabinet.

[0016] Figure 3 It is a top view of the mixing system cabinet.

[0017] In the figure: 1. mixing system box; 2. first stirring assembly; 3. second stirring assembly; 4. third stirring assembly; 5. mixing system discharge pipe; 6. screw stacking dehydrator; 7. screw stacking dehydrator motor; 8. frame; 9. filter tank outlet; 10. alkali dosing port; 11. PAC dosing port; 12. PAM dosing port; 13. liquid level sensor A; 14. liquid level sensor B; 15. first box vent pipe; 16. second box vent pipe; 17. third box vent pipe; 18. first box; 19. second box; 20. third box; 21. feed pipe. DETAILED DESCRIPTION

[0018] The technical solution described in this application is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Example 1

[0020] like Figures 1 to 3 As shown, a screw dewatering machine capable of treating acidic sewage comprises a frame 8, on which a mixing system box 1 and a screw dewatering machine 6 are mounted. The screw dewatering machine 6 comprises a screw dewatering motor 7, which can drive the screw shaft in the screw dewatering machine 6 to lift the sludge fed from the mixing system box 1 to the sludge outlet.

[0021] The mixing system box 1 comprises a first box 18, a second box 19, and a third box 20 connected in sequence. The mixing system box 1 is connected with a feed pipe 21 at the entrance. A first stirring assembly 2 is arranged inside the first box 18. A first guide plate is arranged at a high liquid level at the connection position between the first box 18 and the second box 19. A second stirring assembly 3 is arranged inside the second box 19. A liquid level sensor A13 is arranged at a high liquid level position of the second box 19. A second guide plate is arranged at a high liquid level position and at the connection position between the second box 19 and the third box 20. A third stirring assembly 4 and a liquid level sensor B14 are arranged inside the third box 20. A mixing system discharge pipe 5 is arranged at a high liquid level position of the third box 20. The third box 20 is connected with the inlet end of the screw stacking dehydrator 6 through the mixing system discharge pipe 5.

[0022] The first box 18 is also provided with an alkali dosing port 10 connected to the drug pump at the position, the second box 19 is also provided with a PAC dosing port 11 connected to the drug pump at the position, and the third box 20 is also provided with a PAM dosing port 12 connected to the drug pump at the position. The alkali dosing port 10, the PAC dosing port 11, and the PAM dosing port 12 are respectively connected to the corresponding liquid supply pipelines.

[0023] Example 2

[0024] Continue to see Figures 1 to 3 A screw dehydrator capable of treating acidic sewage, wherein the bottom ends of the first box body 18, the second box body 19 and the third box body 20 are respectively connected with the first box body vent pipe 15, the second box body vent pipe 16 and the third box body vent pipe 17, the first box body vent pipe 15, the second box body vent pipe 16 and the third box body vent pipe 17 are connected with the main vent pipe, and the main vent pipe is also connected with the overflow pipe of the feed pipe 21.

[0025] The feed pipe 21 can be an independent box with a reciprocating flow path, and the independent box is provided with the overflow pipe described in the above paragraph. The first box vent pipe 15, the second box vent pipe 16, and the third box vent pipe 17 are respectively provided with respective stop valves such as ball valves.

[0026] Below the screw press dehydrator 6 is a filter tank for holding filtrate, and the filter tank is connected to a filter tank water outlet 9 .

[0027] The structure and connection relationship of the remaining parts are the same as the structure and connection relationship described in any of the above embodiments, and will not be repeated here to avoid cumbersome writing.

[0028] Based on the above embodiments, the following paragraphs will continue to describe in detail the technical features involved and the functions and roles played by the technical features in the present technical solution, so as to help technicians in this field to fully understand the technical solution and reproduce it.

[0029] The present application focuses on improving the structure and working process of the mixing system box 1 that cooperates with the screw stack dewatering machine, so that it can better achieve the treatment of acidic sludge. In the present application, the feed pipe 21 feeds the water-containing sludge pumped into the first box 18, and the first box 18 stirs the fed sludge through the first stirring assembly 2, and during the stirring process, the alkali agent fed by the drug pump through the alkali dosing port 10 is mixed, and the alkali agent can neutralize the acidic sludge, thereby achieving the purpose of reducing the pH value of the sludge.

[0030] When the water-containing sludge in the first box 18 reaches a high liquid level, it flows into the interior of the second box 19 through the first guide plate at the position of the first box 18 and the second box 19 .

[0031] After entering the second tank 19, the neutralized water-containing sludge is stirred with the PAC agent fed in through the PAC dosing port 11 and the drug pump under the stirring action of the second stirring assembly 3. The water-containing sludge at a low liquid level can be fully mixed with the PAC agent to achieve the effect of coagulation. When the water-containing sludge liquid level in the second tank 19 gradually rises and reaches a high liquid level, it is sensed by the liquid level sensor A13 in the second tank 19. The liquid level sensor A13 transmits the sensed electrical signal to the controller, and the controller can send an electrical signal to the third stirring assembly 4 in the third tank 20 and start the third stirring assembly 4. The water-containing sludge reaching the high liquid level of the second tank 19 enters the interior of the third tank 20 through the second guide plate. The third stirring assembly 4 can stir the water-containing sludge at a low liquid level that enters the third tank 20, and can fully mix the PAM agent fed in through the PAM dosing port 12 and the drug pump during the stirring process to form alum flowers. The sludge mixture fully stirred by the third stirring assembly 4 in the third box 20 gradually reaches the high liquid level and is sensed by the liquid level sensor B14 at the high liquid level. The liquid level sensor B14 sends the electrical signal formed after the induction to the controller. The controller controls the screw dehydration motor 7 to start. The screw dehydration motor 7 drives the screw shaft in the screw dehydrator 6 to rotate, so as to gradually lift the sludge mixture flowing into the mixing system discharge pipe 5 at the high liquid level in the third box 20 from the inlet to the outlet position, and realizes filtration during the lifting process. The sludge after filtration is discharged from the outlet of the screw dehydrator 6, and the filtrate generated during the filtration enters the filter tank at the bottom of the screw dehydrator 6, and the filter tank is connected to the filter tank outlet 9.

[0032] In the present application, the controller may be a control cabinet composed of a PLC programmable controller, a microcomputer or a control switch. The drug pumps corresponding to the first box 18, the second box 19 and the third box 20 may also be connected to the controller through electrical signals to respectively achieve coordination with the first stirring assembly 2, the second stirring assembly 3 and the third stirring assembly 4.

[0033] In the present application, the bottoms of the first box 18, the second box 19, and the third box 20 are respectively connected to the first box vent pipe 15, the second box vent pipe 16, and the third box vent pipe 17, which can discharge the sludge mixture in the corresponding boxes.

[0034] Finally, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A screw press dehydrator capable of treating acidic sewage, comprising a mixing system housing (1) and a screw press dehydrator (6), wherein the screw press dehydrator (6) has a screw press dehydrator motor (7), and the screw press dehydrator motor (7) is capable of driving a screw shaft in the screw press dehydrator (6) to lift sludge to a sludge outlet, characterized in that: The mixing system casing (1) comprises a first casing (18), a second casing (19), and a third casing (20) which are connected in series in sequence. The first casing (18) is connected to a feed pipe (21). The first casing (18) has a first stirring assembly (2) and an alkali dosing port (10). The second casing (19) has a second stirring assembly (3) and a PAC dosing port (11). The third casing (20) has a third stirring assembly (4) and a PAM dosing port (12). The third casing (20) is connected to a screw press dehydrator (6) via a mixing system vent pipe (5). The first casing (18) is also connected to a first casing vent pipe (15). The second casing (19) is also connected to a second casing vent pipe (16). The third casing (20) is also connected to a third casing vent pipe (17).

2. The screw press dehydrator capable of treating acidic sewage according to claim 1, characterized in that: A first guide plate is provided at the connection position between the first box body (18) and the second box body (19), and the first guide plate is located at a high liquid level of the first box body (18).

3. The screw press dehydrator capable of treating acidic sewage according to claim 1, characterized in that: A second guide plate is provided at the connection position between the second box body (19) and the third box body (20), and the second guide plate is located at a high liquid level of the second box body (19).

4. The screw press dehydrator capable of treating acidic sewage according to claim 1, characterized in that: A liquid level sensor A (13) and a liquid level sensor B (14) are respectively arranged inside the second box body (19) and the third box body (20). The liquid level sensor A (13) and the liquid level sensor B (14) are connected to the controller via electrical signals, and the controller is also connected to the first stirring assembly (2), the second stirring assembly (3), the third stirring assembly (4), and the screw stacking dehydration motor (7) via electrical signals.

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