Sewage recycling treatment device capable of reducing sludge content

Abstract

The utility model relates to the technical field of sewage treatment equipment, in particular to a sewage recycling treatment device capable of reducing sludge content, which comprises a settling tank, a stacked spiral sludge dewatering machine and a water collecting pit for containing sewage, a central cylinder is arranged in the settling tank, the axis of the central cylinder coincides with that of the settling tank, and the central cylinder is a tubular body with two open ends; the lower end of the central cylinder is arranged at a position close to the bottom of the settling tank; a water suction pump is arranged in the water collecting pit, a connecting pipe is arranged on the upper portion of the center cylinder, and the connecting pipe is connected with the water suction pump through a water inlet pipe; the lower end of the settling tank is connected with the stacked spiral sludge dehydrator through a sludge discharge pipe; and an overflow pipe is arranged at the upper part of the settling tank. The sedimentation tank and the central cylinder form a backwashing water structure, so that stirring is not needed during sewage treatment, and the sludge sedimentation effect is favorably improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment equipment technology, and in particular to a wastewater reuse treatment device that reduces sludge content. Background Technology

[0002] A wastewater reuse system in a water treatment plant refers to a recycling system that purifies wastewater discharged during the water production process (such as sludge discharge from sedimentation tanks, backwash water from filters, and equipment cleaning water) through a series of treatment measures, making it reusable and allowing it to be reused in the water treatment plant's internal production processes or other suitable uses. Simultaneously, the sludge generated after wastewater treatment can be reused. The core objective of a wastewater reuse system is to reduce the amount of wastewater discharged during water treatment, improve water resource utilization efficiency, reduce water costs for production operations, and simultaneously reduce environmental load and pollution. Wastewater reuse systems are an important component of water treatment plants' efforts to achieve energy conservation, emission reduction, and green production.

[0003] Wastewater often contains sludge, thus requiring a reduction in its sludge content. Existing technologies, such as the patent with publication number CN221460171U, disclose a system for reducing and conditioning residual sludge from biochemical wastewater treatment. The lower part of the sludge conditioning tank is connected to a fermentation broth discharge pipe, and the upper part is connected to a return pipe, which is connected to the fermentation broth discharge pipe. The sludge conditioning tank is also connected to a screw press sludge dewatering machine. A biogas sealing cover is installed on the top of the sludge conditioning tank, and a mixer is installed on top of the biogas sealing cover. The mixer's shaft extends into the sludge conditioning tank, and stirring blades are provided at the lower end of the shaft.

[0004] For wastewater reuse systems in water treatment plants, the wastewater contains only sludge and requires only sedimentation to remove the supernatant for reuse. Therefore, the existing treatment systems described above require stirring devices to agitate the wastewater in the sludge conditioning tank, resulting in poor sludge sedimentation.

[0005] In addition, in commonly used sewage sedimentation tanks, the outlet end of the sewage inlet pipe is often located at the top of the tank. When sewage flows into the sedimentation tank, it will impact the water inside the sedimentation tank, resulting in poor sludge sedimentation. Utility Model Content

[0006] The main objective of this invention is to propose a wastewater reuse treatment device that reduces sludge content, thereby addressing the aforementioned technical problems.

[0007] To achieve the above objectives, this utility model proposes a wastewater reuse treatment device for reducing sludge content, including a sedimentation tank and a screw press sludge dewatering machine, and a collection pit for holding wastewater; a central cylinder is provided inside the sedimentation tank, the central cylinder being aligned with the axis of the sedimentation tank, and the central cylinder is a tubular body with open ends; the lower end of the central cylinder is located near the bottom of the sedimentation tank; a water pump is provided in the collection pit, and a connecting pipe is provided at the upper part of the central cylinder, the connecting pipe being connected to the water pump through an inlet pipe; the lower end of the sedimentation tank is connected to the screw press sludge dewatering machine through a sludge discharge pipe; an overflow pipe is provided at the upper part of the sedimentation tank.

[0008] Preferably, a water collection tank is provided at the opening of the sedimentation tank; the inlet of the overflow pipe is located inside the water collection tank.

[0009] Preferably, the wastewater treatment device further includes a PAC dosing device, which is connected to the screw press sludge dewatering machine.

[0010] Preferably, the lower end of the sedimentation tank is configured as an inverted cone, and the inlet end of the sludge discharge pipe is connected to the tip of the inverted cone.

[0011] Preferably, four support columns are welded to the outer wall of the upper part of the inverted cone of the sedimentation tank, and a pad is welded to the bottom end of the support columns. The pad is a rectangular steel plate of 400×400mm and the thickness of the pad is 8mm.

[0012] Preferably, an electric clamp butterfly valve and a turbine butterfly valve are connected in series on the sludge discharge pipe.

[0013] Preferably, the sedimentation tank is provided with a plurality of central cylinder support frames arranged at intervals from top to bottom, and the central cylinder support frames are connected to the central cylinder.

[0014] Preferably, the central cylinder support frame is a grid-shaped support made of four angle steels, with the two ends of each angle steel welded to the inner wall of the sedimentation tank; the central cylinder is inserted into the rectangular hole in the middle of the central cylinder support frame and welded thereon.

[0015] Preferably, the connecting pipe is perpendicular to the axis of the central cylinder, and the connecting pipe is offset from the axis of the central cylinder to form a tangential water inlet.

[0016] Preferably, a reinforcing ring is welded to the outer wall at the top of the settling tank, and the reinforcing ring is a ring-shaped body made of channel steel.

[0017] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows:

[0018] (1) In this utility model, a central cylinder is provided inside the sedimentation tank, and the lower end of the central cylinder is located near the bottom of the sedimentation tank. Therefore, the sedimentation tank and the central cylinder form a backwash water structure. When treating sewage, the sewage in the collection pit is pumped into the central cylinder and flows into the sedimentation tank from the lower end of the central cylinder for sedimentation. The sludge after sedimentation is discharged into the screw press sludge dewatering machine through the sludge discharge pipe for concentration and dewatering before being discharged. The upper clear liquid in the sedimentation tank can be discharged through the overflow pipe for reuse.

[0019] (2) By setting a central cylinder inside the sedimentation tank, sewage flows into the sedimentation tank through the lower end of the central cylinder, which effectively avoids the impact on the water inside the sedimentation tank when the water enters, and is conducive to improving the sludge sedimentation effect.

[0020] (3) In this utility model, the sedimentation tank and the central cylinder form a backwash water structure, which eliminates the need for stirring during wastewater treatment, thus improving the sludge sedimentation effect. Using a backwash water structure for recycling and sedimentation not only saves water resources but also reduces treatment costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the wastewater treatment device provided by this utility model;

[0023] Figure 2 This is a top view of the sedimentation tank in this utility model;

[0024] Figure 3 for Figure 1 Sectional view at point DD;

[0025] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 5 for Figure 1 Enlarged view of point C in the middle.

[0027] Explanation of reference numerals in the attached diagram: 1. Sedimentation tank; 2. Screw press sludge dewatering machine; 3. Sump; 4. Central cylinder; 5. Water pump; 6. Inlet pipe; 7. Sludge discharge pipe; 8. Connecting pipe; 9. Overflow pipe; 10. Sump; 11. PAC dosing device; 12. Electric clamp butterfly valve; 13. Turbine butterfly valve; 14. Support column; 14a. Pad plate; 15. Central cylinder support frame; 16. Reinforcing ring. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Combination Figure 1 As shown, a wastewater reuse treatment device for reducing sludge content includes a sedimentation tank 1 and a screw press sludge dewatering machine 2, and a collection pit 3 for holding wastewater; a central cylinder 4 is provided inside the sedimentation tank 1, the central cylinder 4 is aligned with the axis of the sedimentation tank 1, and the central cylinder 4 is a tubular body with open ends; the lower end of the central cylinder 4 is located near the bottom of the sedimentation tank 1; a water pump 5 is provided in the collection pit 3, and a connecting pipe 8 is provided on the upper part of the central cylinder 4, the connecting pipe 8 being connected to the water pump 5 through an inlet pipe 6; the lower end of the sedimentation tank 1 is connected to the screw press sludge dewatering machine 2 through a sludge discharge pipe 7; an overflow pipe 9 is provided at the upper part of the sedimentation tank 1.

[0031] Combination Figure 1 and Figure 5 As shown, a water collection tank 10 is provided at the opening of the sedimentation tank 1; the inlet of the overflow pipe 9 is located inside the water collection tank 10.

[0032] In this embodiment, the wastewater treatment device further includes a PAC dosing device 11, which is connected to the screw press sludge dewatering machine 2. The PAC dosing device 11 is used to add polyaluminum chloride into the screw press sludge dewatering machine 2, where it reacts with suspended particles and colloidal substances in the water to form larger flocs, which facilitate subsequent separation.

[0033] Combination Figure 1 As shown, the lower end of the sedimentation tank 1 is configured as an inverted cone, and the inlet end of the sludge discharge pipe 7 is connected to the tip of the inverted cone. The purpose of setting the inverted cone is to facilitate the discharge of the sludge settled in the sedimentation tank 1 into the screw press sludge dewatering machine 2 through the sludge discharge pipe 7.

[0034] Combination Figure 1 As shown, four support columns 14 are welded to the outer wall of the upper part of the inverted cone of the sedimentation tank 1. A pad 14a is welded to the bottom end of the support column 14. The pad 14a is a rectangular steel plate of 400×400mm and the thickness of the pad 14a is 8mm.

[0035] In this embodiment, an electric clamp butterfly valve 12 and a turbine butterfly valve 13 are connected in series on the sludge discharge pipe 7.

[0036] Combination Figures 1 to 4 As shown, multiple central cylinder support frames 15 are arranged at intervals from top to bottom inside the sedimentation tank 1, and the central cylinder support frames 15 are connected to the central cylinder 4. The central cylinder support frames 15 provide support for the central cylinder 4. Further, the central cylinder support frame 15 is a grid-shaped bracket made of four angle steels, with both ends of each angle steel welded to the inner wall of the sedimentation tank 1; the central cylinder 4 is inserted into and welded into the rectangular hole in the middle of the central cylinder support frame 15.

[0037] Combination Figure 1 , Figure 2 As shown, the connecting pipe 8 is perpendicular to the axis of the central cylinder 4, and the connecting pipe 8 is offset from the axis of the central cylinder 4 to form a tangential water inlet. Specifically, the connection part between the connecting pipe 8 and the central cylinder 4 is as follows: Figure 1 As shown at point B, because the axis of the connecting pipe 8 is misaligned with the axis of the central cylinder 4, tangential water inlet is formed at point B when water is introduced, which helps to reduce the impact on the water in the sedimentation tank 1 when water is introduced.

[0038] Combination Figure 1 and Figure 5 As shown, a reinforcing ring 16 is welded to the outer wall at the top of the sedimentation tank 1 to provide reinforcement. The reinforcing ring 16 is a ring-shaped body made of channel steel.

[0039] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A wastewater reuse treatment device for reducing sludge content, comprising a sedimentation tank (1) and a screw press sludge dewatering machine (2), characterized in that, It also includes a sump for holding sewage (3); A central cylinder (4) is provided inside the sedimentation tank (1). The central cylinder (4) is aligned with the axis of the sedimentation tank (1). The central cylinder (4) is a tubular body with open ends. The lower end of the central cylinder (4) is located near the bottom of the sedimentation tank (1). A water pump (5) is installed in the water collection pit (3), and a connecting pipe (8) is installed on the upper part of the central cylinder (4). The connecting pipe (8) is connected to the water pump (5) through the water inlet pipe (6); the lower end of the sedimentation tank (1) is connected to the screw press sludge dewatering machine (2) through the sludge discharge pipe (7). An overflow pipe (9) is provided at the upper part of the sedimentation tank (1).

2. The wastewater reuse treatment device for reducing sludge content as described in claim 1, characterized in that, A water collection tank (10) is provided at the opening of the sedimentation tank (1); the inlet of the overflow pipe (9) is located inside the water collection tank (10).

3. The wastewater reuse treatment device for reducing sludge content as described in claim 1, characterized in that, It also includes a PAC feeder (11), which is connected to the screw press sludge dewatering machine (2).

4. The wastewater reuse treatment device for reducing sludge content as described in claim 1, characterized in that, The lower end of the sedimentation tank (1) is configured as an inverted cone, and the inlet end of the sludge discharge pipe (7) is connected to the tip of the inverted cone.

5. A wastewater reuse treatment device for reducing sludge content as described in claim 4, characterized in that, Four support columns (14) are welded to the outer wall of the upper part of the inverted cone of the sedimentation tank (1). A pad (14a) is welded to the bottom end of the support column (14). The pad (14a) is a rectangular steel plate of 400×400mm and the thickness of the pad (14a) is 8mm.

6. The wastewater reuse treatment device for reducing sludge content as described in claim 1, characterized in that, An electric clamp butterfly valve (12) and a turbine butterfly valve (13) are connected in series on the sludge discharge pipe (7).

7. A wastewater reuse treatment device for reducing sludge content as described in claim 1, characterized in that, Inside the sedimentation tank (1), a plurality of central cylinder support frames (15) are arranged at intervals from top to bottom, and the central cylinder support frames (15) are connected to the central cylinder (4).

8. A wastewater reuse treatment device for reducing sludge content as described in claim 7, characterized in that, The central cylinder support frame (15) is a grid-shaped support made of four angle steels, with the two ends of each angle steel welded to the inner wall of the sedimentation tank (1); the central cylinder (4) is inserted into the rectangular hole in the middle of the central cylinder support frame (15) and welded.

9. A wastewater reuse treatment device for reducing sludge content as described in claim 1, characterized in that, The connecting pipe (8) is perpendicular to the axis of the central cylinder (4), and the connecting pipe (8) and the axis of the central cylinder (4) are misaligned to form a tangential water inlet.

10. A wastewater reuse treatment device for reducing sludge content as described in claim 1, characterized in that, A reinforcing ring (16) is welded to the outer wall at the top of the settling tank (1). The reinforcing ring (16) is a ring-shaped body made of channel steel.

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