Sludge dewatering device coupled with swirler

Abstract

The sludge dewatering device comprises a stacked screw dehydrator, a flocculation mixing tank, the swirler and a water storage tank, the stacked screw dehydrator is erected above the water storage tank, a water outlet in the bottom of the stacked screw dehydrator is communicated with the water storage tank, the flocculation mixing tank is arranged at the front end of the stacked screw dehydrator, and an outlet of the flocculation mixing tank is connected with an inlet of the stacked screw dehydrator; the swirler is arranged at the front end of the flocculation mixing tank, the swirler is provided with a feed port, an overflow port and an underflow port, the lower end of the swirler is inserted into the flocculation mixing tank, the underflow port of the swirler is communicated with the flocculation mixing tank, and the overflow port of the swirler is communicated with the water storage tank through an overflow pipe; and a stirring device is arranged in the flocculation mixing tank. When the device is used, fine sand in activated sludge can be effectively separated from a sludge mixed solution under the action of the hydrocyclone, enters the stacked screw dehydrator along with a sludge-water mixed solution and is compressed into dry sludge to be discharged, so that the influence of inorganic silt on the biochemical treatment unit is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of sludge dewatering equipment, specifically to a sludge dewatering device with a coupled hydrocyclone. Background Technology

[0002] The MLVSS / MLSS ratio of activated sludge in existing municipal wastewater treatment plants is generally low. This is primarily due to the elimination of primary sedimentation tanks to meet nitrogen and phosphorus removal requirements. This results in fine sludge particles smaller than 0.2 mm, which would normally be removed by primary sedimentation, entering the biological treatment unit. Furthermore, some of this fine sludge exists in the suspended phase, leading to a low MLVSS / MLSS ratio in the activated sludge. If this activated sludge, rich in fine particles, is not removed promptly, it will impact the operation of subsequent treatment units, causing issues such as pipe blockage, reduced biological tank volume, wear and tear on aeration equipment, decreased anaerobic digestion efficiency, and wear and tear on sludge dewatering equipment. Therefore, achieving effective separation of inorganic sludge from activated sludge is a pressing issue in municipal wastewater treatment.

[0003] Hydrocyclones are widely used in wastewater treatment due to their high separation efficiency, eco-friendly nature, and small footprint. However, when used alone, hydrocyclones cannot completely separate sludge and water, easily leading to coarse particle overflow and fine particle entrainment in the underflow. Furthermore, existing hydrocyclones cannot adjust the hydrocyclone separation process according to the sludge flow rate when treating different types of sludge, making it difficult to achieve optimal separation results.

[0004] The screw press dewatering machine is a new type of sludge dewatering equipment. Due to its characteristics of easy separation of sludge and water and non-clogging, it is widely used in sludge dewatering technology. However, when the screw press dewatering machine is used alone to treat activated sludge, the dewatering efficiency is low and the sludge after dewatering has a high water content. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a sludge dewatering device with a coupled hydrocyclone.

[0006] The technical solution adopted in this utility model is:

[0007] A sludge dewatering device with a coupled hydrocyclone includes a screw press dewatering machine, a flocculation mixing tank, a hydrocyclone, and a water storage tank. The screw press dewatering machine is mounted above the water storage tank, and its bottom outlet is connected to the water storage tank. The flocculation mixing tank is located at the front end of the screw press dewatering machine, and its outlet is connected to the inlet of the screw press dewatering machine. The hydrocyclone is located at the front end of the flocculation mixing tank and has an inlet, an overflow outlet, and an underflow outlet. The lower end of the hydrocyclone is inserted into the flocculation mixing tank, and its underflow outlet is connected to the flocculation mixing tank. The overflow outlet of the hydrocyclone is connected to the water storage tank through an overflow pipe. The flocculation mixing tank is equipped with a stirring device and a flocculant inlet.

[0008] Activated sludge enters the hydrocyclone tangentially through the inlet under pressure or gravity. After centrifugal separation, the supernatant flows from the overflow outlet into the storage tank via the overflow pipe. The sludge mixture containing fine sand enters the flocculation mixing tank through the bottom outlet, where it is thoroughly mixed with flocculants by a stirring device before entering the screw press dewatering machine. The dewatered and concentrated dry material from the screw press dewatering machine is conveyed to the sludge hopper, and the filtrate enters the storage tank, where it merges with the overflow from the hydrocyclone and returns to the biological treatment unit. Through this process, inorganic sludge is effectively separated from the activated sludge.

[0009] Furthermore, it also includes a regulating pipe and a lifting device. One end of the regulating pipe is inserted into the underflow port of the hydrocyclone and connected to the underflow port. The other end is connected to the outlet of the dosing device through a hose. The regulating pipe is driven by the lifting device to move up and down in the flocculation mixing tank, thereby changing the depth of the regulating pipe inserted into the underflow port.

[0010] Studies have shown that the inlet flow rate directly determines the intensity of the internal flow field of the hydrocyclone, thus affecting its operating characteristics. A smaller inlet flow rate results in a slower internal flow field rotation speed, lower centrifugal intensity, and poorer classification of the mixture. Conversely, a larger inlet flow rate increases the internal pressure difference, improving separation efficiency. However, once the inlet flow rate exceeds a certain rated value, the increased internal pressure difference leads to insufficient supply pressure, hindering the normal operation of the hydrocyclone and reducing classification efficiency. Therefore, it is difficult to balance the separation effect when treating mixtures with different inlet flow rates. This invention addresses this by incorporating a regulating pipe and a lifting device. When the sludge flow rate decreases, the internal flow field rotation speed decreases, and the classification effect deteriorates. The lifting device drives the regulating pipe upwards, increasing its insertion depth into the underflow outlet, thus strengthening the interference swirling motion and improving the hydrocyclone's classification separation effect. Conversely, when the sludge flow rate increases, the internal pressure difference increases, resulting in higher separation efficiency. This drives the regulating pipe downwards, relieving internal pressure and ensuring the hydrocyclone's separation effect.

[0011] Furthermore, the end of the regulating pipe inserted into the hydrocyclone is sealed, and the side wall of the sealed end is inclined upward with several through holes communicating with the underflow port. The reagent entering the regulating pipe is released upward through the through holes and comes into contact with the sludge mixture flowing out from the underflow port of the hydrocyclone. The opposing forces impact the large sludge pieces in the mixture, which can prevent the underflow port of the hydrocyclone from being blocked and increase the mixing effect of the reagent and sludge.

[0012] Furthermore, the regulating pipe is S-shaped. This facilitates the connection between the regulating pipe and the dosing device and hydrocyclone, and also allows the reagent to be further mixed evenly within the S-shaped pipe, improving the flocculation effect.

[0013] Furthermore, the lifting device includes a lead screw rotatably mounted in the flocculation mixing tank, a lead screw motor that drives the lead screw to rotate, a nut threadedly connected to the lead screw, and a lifting plate for fixing the adjusting pipe and the nut. The structure is simple and the control is convenient.

[0014] Furthermore, the hydrocyclone's inlet is equipped with a feed flow meter, which is connected to the lifting device via a PID control system. The PID control system uses the sludge flow signal detected by the feed flow meter to control the lifting device, which drives the regulating pipe to move up and down within the flocculation mixing tank. This achieves automatic control and ensures the hydrocyclone's separation effect.

[0015] Furthermore, it also includes a sludge hopper, which is located below the dry sludge outlet of the screw press dewatering machine and is used to receive the sludge after dewatering and concentration.

[0016] Furthermore, the outlet of the flocculation mixing tank is connected to the overflow inlet of the screw press dewatering machine via a corrugated pipe. This reduces power consumption and lowers operating costs.

[0017] The beneficial effects of this utility model are:

[0018] 1. By coupling the hydrocyclone with the screw press dewatering machine, the fine sand in the activated sludge can be effectively separated from the sludge mixture under the action of the hydrocyclone. The separated sludge-water mixture enters the screw press dewatering machine, where the fine sand is compressed into dry sludge and discharged from the system. The filtrate from the screw press dewatering machine and the overflow liquid from the hydrocyclone are combined and returned to the biological treatment unit, which greatly reduces the impact of inorganic sludge on the biological treatment unit.

[0019] 2. After being separated by cyclone separation, the activated sludge is thoroughly mixed with the reagent. The sludge mixture is then dewatered in a screw press dewatering machine. The sludge undergoes multi-stage separation and dewatering treatment, which greatly improves the efficiency of sludge dewatering and separation and the dewatering and drying rate.

[0020] 3. It can handle activated sludge of different flow rates, has strong adaptability, and is widely applicable. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the sludge dewatering device of the present invention.

[0022] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solution of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and a preferred embodiment.

[0024] See Figure 1 and Figure 2A sludge dewatering device with a coupled hydrocyclone includes a screw press dewatering machine 1, a flocculation mixing tank 2, a hydrocyclone 3, and a water storage tank 4.

[0025] The screw press dewatering machine 1 and the flocculation mixing tank 2 are mounted on top of the water storage tank 4 via a bracket 13. The feed inlet at the front end of the screw press dewatering machine 1 is connected to the overflow outlet of the flocculation mixing tank 2 via a corrugated pipe 12. The sludge outlet at the rear end of the screw press dewatering machine 1 is connected to a sludge hopper 9, which is mounted on the rear side of the water storage tank 4 to receive the sludge discharged from the screw press dewatering machine 1. The bottom outlet of the screw press dewatering machine 1 is connected to the inlet of the water storage tank 4 via a pipe.

[0026] The screw press dewatering machine is used for deep dewatering of sludge. The sludge mixture after being mixed with the agent overflows into the screw press dewatering machine through the corrugated pipe 12. The screw press dewatering machine performs deep dewatering and drying of the sludge. The dewatered and concentrated dry material is transported to the sludge hopper 9, and the filtrate is transported to the water storage tank 4 through the pipeline, where it merges with the overflow water from the hydrocyclone.

[0027] The flocculation mixing tank 2 is located at the front end of the screw press dewatering machine 1, and is equipped with a stirring device. The flocculation mixing tank 2 serves as the sludge flocculation reaction mixing zone. After the sludge mixture flowing out from the bottom outlet of the hydrocyclone and the reagent enter the flocculation mixing tank, the mixing is accelerated under the action of the stirring device, thereby improving the flocculant effect.

[0028] The hydrocyclone 3 is located in the feed box at the front end of the flocculation mixing tank 2. The hydrocyclone 3 has a feed inlet 301, an overflow port 302, and a bottom outlet 303. The overflow port 302 of the hydrocyclone 3 is connected to the water storage tank 4 through an overflow pipe 5. The lower end of the hydrocyclone 3 is inserted into the flocculation mixing tank 2, and its bottom outlet 303 is connected to the feed box. In this embodiment, the regulating pipe 6 is S-shaped, with one end inserted into the bottom outlet 303 of the hydrocyclone closed. The side wall of the closed end is inclined upward and has several through holes 601. The regulating pipe 6 is connected to the hydrocyclone 3 through a lifting device 7. The lifting device 7 includes a screw motor, a screw 71, a nut 72, and a lifting plate 73. The screw 71 is rotatably mounted on the top cover of the flocculation mixing tank 2. The screw motor is used to drive the screw 71 to rotate. The nut 72 is screwed onto the screw 71. One end of the lifting plate 73 is fixed to the nut 72, and the other end is fixed to the regulating pipe 6. The lower half of the regulating pipe 6 is slidably passed through the cover plate of the flocculation mixing tank 2 and is located in the feed box, and is slidably connected to the underflow port 303 of the hydrocyclone. The upper half of the regulating pipe 6 extends out of the flocculation mixing tank 2 and is connected to the dosing device 10 through the hose 11. The dosing device 10 is the prior art and is used to provide flocculant to the flocculation mixing tank 2.

[0029] The feed inlet 301 of the hydrocyclone 3 is equipped with a feed flow meter 8, which is used to monitor the sludge flow rate entering the hydrocyclone.

[0030] The feed flow meter 8 and the screw motor of the lifting device 7 are connected through a PID control system. The PID control controls the lifting device 7 to drive the regulating pipe 6 to move up and down in the flocculation mixing tank 2 based on the sludge flow signal detected by the feed flow meter 8. Specifically, when the sludge flow rate decreases, the internal flow field rotation speed decreases, the classification effect deteriorates, and the lifting device drives the regulating pipe to move upward. The depth of the regulating pipe inserted into the bottom flow port increases, which strengthens the interference swirling motion and improves the classification and separation effect of the hydrocyclone. Conversely, when the sludge flow rate increases, the internal pressure difference increases, the separation efficiency is high, and the regulating pipe is driven to move downward to relieve the internal pressure of the hydrocyclone, thereby ensuring the separation effect of the hydrocyclone.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A sludge dewatering device with a coupled hydrocyclone, characterized in that, The system includes a screw press dewatering machine (1), a flocculation mixing tank (2), a hydrocyclone (3), and a water storage tank (4). The screw press dewatering machine (1) is mounted above the water storage tank (4), and its bottom outlet is connected to the water storage tank (4). The flocculation mixing tank (2) is located at the front end of the screw press dewatering machine (1), and its outlet is connected to the inlet of the screw press dewatering machine (1). The hydrocyclone (3) is located at the front end of the flocculation mixing tank (2). The hydrocyclone (3) is equipped with a feed inlet (301), an overflow outlet (302), and a bottom outlet (303). The lower end of the hydrocyclone (3) is inserted into the flocculation mixing tank (2), and its bottom outlet (303) is connected to the flocculation mixing tank (2). The overflow outlet (302) of the hydrocyclone (3) is connected to the water storage tank (4) through an overflow pipe (5). The flocculation mixing tank (2) is equipped with a stirring device and a flocculant inlet.

2. The sludge dewatering device with a coupled hydrocyclone according to claim 1, characterized in that, It also includes a regulating pipe (6) and a lifting device (7). One end of the regulating pipe (6) is inserted into the underflow port (303) of the hydrocyclone (3) and connected to the underflow port (303). The other end is connected to the outlet of the dosing device (10) through a hose (11). The regulating pipe (6) is driven by the lifting device (7) to move up and down in the flocculation mixing tank (2), thereby changing the depth of the regulating pipe (6) inserted into the underflow port (303).

3. The sludge dewatering device with a coupled hydrocyclone according to claim 2, characterized in that, The regulating tube (6) is inserted into the hydrocyclone (3) at one end and closed. The side wall of the closed end is inclined upward and has several through holes (601) that connect to the underflow port (303).

4. The sludge dewatering device with a coupled hydrocyclone according to claim 3, characterized in that, The regulating tube (6) is S-shaped.

5. A sludge dewatering device with a coupled hydrocyclone according to claim 2, characterized in that, The lifting device (7) includes a screw (71) rotatably installed in the flocculation mixing tank (2), a screw motor that drives the screw to rotate, a nut (72) threadedly connected to the screw, and a lifting plate (73) for fixing the adjusting pipe (6) and the nut (72).

6. The sludge dewatering device with a coupled hydrocyclone according to claim 2, characterized in that, The feed inlet (301) of the hydrocyclone (3) is equipped with a feed flow meter (8). The feed flow meter (8) is connected to the lifting device (7) through a PID control system. The PID control controls the lifting device (7) to drive the regulating pipe (6) to move up and down in the flocculation mixing tank (2) according to the sludge flow signal detected by the feed flow meter (8).

7. A sludge dewatering device with a coupled hydrocyclone according to claim 1, characterized in that, It also includes a mud hopper (9), which is located below the dry mud outlet of the screw press dewatering machine (1) and is used to receive the dewatered sludge.

8. A sludge dewatering device with a coupled hydrocyclone according to claim 1, characterized in that, The outlet of the flocculation mixing tank (2) is connected to the inlet overflow of the screw press dewatering machine (1) through a corrugated pipe (12).

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