Step cylinder type sludge conditioning and separating device

Abstract

The utility model provides a stepped cylinder type sludge conditioning and separating device. The stepped cylinder type sludge conditioning and separating device comprises a sludge inlet pipe, a dosing pipe, a mixing cylinder, a mixed sludge outlet pipe, a rectifying tank, a settling tank, a supernate outlet pipe and a settled sludge outlet pipe, the dosing pipe, the post-precipitation sludge outlet pipe and the supernate outlet pipe are respectively provided with an electric valve; an electric valve is arranged at the inlet of the sludge inlet pipe; a check valve is arranged at the outlet of the sludge inlet pipe; the sludge inlet pipe is connected with the mixing cylinder in a manner of being vertical to the mixing cylinder and tangent to the lower bottom surface of the cylinder; the upper part of the mixing cylinder is connected with the rectifying tank through a mixed sludge outlet pipe; the rectifying tank and the settling tank are arranged in a sleeve form, the top of the settling tank is fixedly connected with the upper bottom surface of the rectifying tank and arranged in the rectifying tank, and the bottom of the rectifying tank is communicated with the bottom of the settling tank; a supernate outflow pipe is arranged at the upper part of the settling tank and penetrates out of the side wall of the rectifying tank; and a settled sludge outlet pipe is arranged in the middle of the settling tank and penetrates out of the rectifying tank.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge treatment, and particularly relates to a stepped cylindrical sludge conditioning and separation device. Background Art

[0002] A large amount of activated sludge is produced during the treatment of urban sewage. These sludges have a high water content (generally about 97%) and small sludge particles with high water content. The main solid matter in the sludge is humus, which is composed of hydrophilic negatively charged colloidal particles. Its particle size is extremely uneven and small, the structure is complex, and the affinity with water is strong. The dehydration performance is poor, and it is not easy to sink and compact. Sludge conditioning can improve the concentration and dehydration efficiency of sludge by adding drugs, thereby improving the characteristics of sludge. The existing sludge conditioning device often needs to be connected to the mud-water separation device, which increases the equipment cost and prolongs the process flow. At the same time, the existing sludge conditioning often sets mechanical stirring as the input energy for mud-drug mixing, and the energy in the sludge pipeline transmission is not utilized, and the efficiency is low.

[0003] In view of the above problems, the present invention proposes a stepped cylindrical sludge conditioning and separation device. In view of the common problems in the sludge treatment process, such as lengthy process and low energy utilization efficiency, the stepped cylindrical sludge conditioning and separation device is designed to realize sludge conditioning and mud-water separation at the same time, saving the setting of a stirring device and a mud-water separation device, improving the efficiency of the sludge treatment process, streamlining the process and reducing energy consumption. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a stepped cylindrical sludge conditioning and separation device for solving the problems commonly existing in the sludge treatment process, such as lengthy process and low energy utilization efficiency.

[0005] In order to achieve the above purpose, the utility model provides a stepped cylindrical sludge conditioning and separation device, including a sludge inlet pipe, a dosing pipe, a mixing cylinder, a sludge outlet pipe after mixing, a rectifying tank, a sedimentation tank, a supernatant outlet pipe and a sludge outlet pipe after sedimentation; the dosing pipe, the sludge outlet pipe after sedimentation and the supernatant outlet pipe are all equipped with electric valves; the electric valve and the check valve are arranged in sequence on the sludge inlet pipe according to the water flow direction; the sludge inlet pipe is connected to the mixing cylinder perpendicularly and tangent to the bottom surface of the cylinder, and the muddy water flows into the mixing cylinder along the radial direction, and after the sewage carries the sludge into the mixing cylinder at a large flow rate, the water body hits the cylinder wall and is broken The sludge is broken into countless micro-clusters, which are then formed into a large number of vortex groups of different sizes under the action of shear force. The sludge flow in the cylinder spirals up under the action of inertial centrifugal effect, and the large vortex gradually diffuses into smaller vortices with more numbers, which accelerates the mixing and conditioning of the sludge. A post-mixing sludge outlet pipe is arranged on the upper part of the mixing cylinder and connected to the rectifier tank. The rectifier tank and the sedimentation tank are arranged in the form of a sleeve, and the top of the sedimentation tank is welded to the upper bottom surface of the rectifier tank and arranged inside the rectifier tank. A supernatant outlet pipe is arranged on the upper part of the sedimentation tank and passes through the rectifier tank. A post-settlement sludge outlet pipe is arranged in the middle of the sedimentation tank and passes through the rectifier tank.

[0006] The device is divided into a mixing and conditioning zone, an annular water distribution zone and a sedimentation zone in the order of water flow direction. The hydraulic retention time of each zone is as follows: the hydraulic retention time of the mixing and conditioning zone is 30 to 120 seconds, the sedimentation time of the sedimentation zone is 5 to 15 minutes, and the hydraulic retention time of the annular water distribution zone is determined by the inner diameter and height of the rectifier tank and the sedimentation tank. A mixing and conditioning zone is formed inside the mixing cylinder; the area enclosed by the inner wall of the rectifier tank and the outer wall of the sedimentation tank forms an annular water distribution zone, and the bottom of the rectifier tank is connected to the bottom of the sedimentation tank; a sedimentation zone is formed inside the sedimentation tank; the annular water distribution zone and the sedimentation zone are connected, and the sludge flowing into the rectifier tank has a fast flow rate and hits the outer wall of the sedimentation tank to consume kinetic energy. After entering the sedimentation zone, the mud and water eliminate hydraulic disturbances, and the mud and water are separated under the action of gravity. The precipitated sludge and supernatant flow out of the device from the mud outlet pipe after sedimentation and the supernatant outlet pipe respectively. The position and size of the supernatant outlet pipe and the mud outlet pipe are set to ensure that the treated mud and water are discharged in time, and a mud suction pump can also be set on the mud outlet pipe. Since the sludge flowing into the rectifying tank has a fast flow rate, in order to make the sludge settle by gravity in the sedimentation area under relatively stable hydraulic conditions, an annular water distribution area is set up. The sludge flowing out of the mud outlet pipe of the mixing barrel hits the outer wall of the sedimentation tank through the annular water distribution area to consume kinetic energy, and continues to flow downward along the outer wall to the bottom of the rectifying tank. The sludge after rectification in the annular water distribution area rises synchronously in the annular water distribution area and the sedimentation area.

[0007] Furthermore, the inner diameter range of the mud inlet pipe is set to DN100-DN200. In order to make the sludge in the mud inlet pipe in a turbulent state and fully mixed and conditioned, the flow rate is set to 1.0-2.5m / s; the inner diameter range of the dosing pipe is set to DN10-DN50.

[0008] Furthermore, the dosing pipe includes a PAC dosing pipe and a PAM dosing pipe, and is connected to the mud inlet pipe in the form of a branch pipe between the electric valve and the check valve.

[0009] Furthermore, a flow meter is installed on the supernatant outlet pipe to record the water flow velocity, and the opening and closing of the electric valve of the mud outlet pipe is controlled by the flow meter electrical signal.

[0010] Furthermore, the diameter of the mud discharge pipe after mixing is set to DN150, the diameter of the supernatant discharge pipe is set to DN100, and the diameter of the mud discharge pipe after sedimentation is set to DN200.

[0011] Furthermore, the inner diameter of the mixing cylinder is set to a range of 0.3 to 0.5 m, and the height-to-diameter ratio is set to a range of 5 to 10.

[0012] Furthermore, the position and size of the supernatant outlet pipe and the post-precipitation mud outlet pipe are determined by the change in sludge moisture content before and after conditioning:

[0013] V 2 =V 1 (100-p 1 ) / (100-p 2 )

[0014] Where V 2 V is the volume of mud water after the water content changes, 1 is the initial muddy water volume in the sedimentation area, p 1 is the initial moisture content, p 2 It is the moisture content after conditioning.

[0015] Taking the sludge moisture content before conditioning as 98% and the sludge moisture content after conditioning as 95-97% as an example, we can get:

[0016] V 2 =V 1 (100-98) / [100-(95~97)]≈(0.4~0.667)V 1 .

[0017] Therefore, the mud-water boundary line appears at (0.4~0.667)H in the sedimentation zone, and a supernatant discharge pipe is set at the top of the sedimentation zone (i.e., at H), where H is the height of the pipe bottom; a mud discharge pipe is set at 0.4H, where 0.4H is the height of the pipe top.

[0018] Furthermore, the difference in inner diameters between the rectifying tank and the sedimentation tank ranges from 0.05 to 0.10 m, and the difference in height ranges from 0.1 to 0.4 m.

[0019] Furthermore, the three tanks of the device are all made of Q235A steel, and both the inside and outside of the tanks are required to be treated for corrosion resistance by coating with epoxy coal tar primer and topcoat. The inside of the tank is in direct contact with the sludge, so the anti-corrosion process requirements are higher than those of the outside.

[0020] Furthermore, a fixed support is provided at the bottom of each tank body of the device to ensure the stability of the device. The support is fixed in a short-arm ear-type manner, and a pad is welded at the connection with the tank body.

[0021] The beneficial effects of the utility model are as follows:

[0022] (1) The design of the mixing conditioning area, annular water distribution area and sedimentation area of ​​the utility model realizes the effect of sludge conditioning and mud-water separation in one device. Compared with the general sludge treatment process, the mud-water separation device needs to be connected after the conditioning tank, which undoubtedly simplifies the process flow and saves equipment costs.

[0023] (2) The mixing cylinder design of the utility model uses the energy of the pipeline transportation process to form a spiral upward flow and vortices of different sizes in the cylinder, thereby accelerating the mass transfer process and achieving efficient mixing of the sludge and conditioning agent.

[0024] (3) The mixing drum design of the utility model fully utilizes the energy of sludge during pipeline transportation, replaces the mechanical stirring device with hydraulic mixing, and saves equipment cost and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the utility model stepped cylindrical sludge conditioning and separation device;

[0026] In the figure, 1 is a mixing drum, 2 is a mixing and conditioning area, 3 is a PAC dosing pipe, 4 is a PAM dosing pipe, 5 is a mud inlet pipe, 6 is an electric valve, 7 is a check valve, 8 is a rectifier tank, 9 is a sedimentation tank, 10 is a flow meter, 11 is a supernatant outlet pipe, 12 is an annular water distribution area, 13 is a sedimentation area, 14 is a mud outlet pipe after sedimentation, and 15 is a mud outlet pipe after mixing. DETAILED DESCRIPTION

[0027] The following is a detailed description of the embodiments of the present invention. The following embodiments are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0028] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "top", "bottom", "up", "down", "left", "right" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0029] The utility model provides a stepped cylindrical sludge conditioning and separation device, which can perform sludge conditioning and mud-water separation processes in a continuous flow manner, thereby improving sludge treatment efficiency, simplifying process flow, and saving equipment costs.

[0030] The utility model provides a stepped cylindrical sludge conditioning and separation device with an effective volume of 6.514m 3 , including a mud inlet pipe 5, a PAC dosing pipe 3, a PAM dosing pipe 4, a mixing drum 1, a mud outlet pipe 15 after mixing, a rectifying tank 8, a sedimentation tank 9, a supernatant outlet pipe 11 and a mud outlet pipe 14 after sedimentation; the PAC dosing pipe 3, the PAM dosing pipe 4, the mud outlet pipe 14 after sedimentation and the supernatant outlet pipe 11 are all equipped with electric valves; the mud inlet pipe 5 is sequentially provided with an electric valve 6 and a check valve 7 according to the direction of water flow, and the PAC dosing pipe 3 and the PAM dosing pipe 4 with a diameter of DN50 are connected to the mud inlet pipe 5 in the form of a branch pipe between the electric valve 6 and the check valve 7; the mud inlet pipe 5 with a diameter of DN200 is connected at the bottom of the mixing drum 1, and the mud outlet pipe 15 after mixing and the rectifying tank 8 are provided at the upper part of the mixing drum 1. The rectifier tank 8 and the sedimentation tank 9 are connected, and the diameter of the mud outlet pipe 15 after mixing is set to DN150; the rectifier tank 8 and the sedimentation tank 9 are arranged in the form of a sleeve, and the sedimentation tank 9 is arranged inside the rectifier tank 8, and the top is welded to the upper surface of the rectifier tank 8, and no lower bottom surface is arranged and it is 0.15m away from the bottom of the rectifier tank, and the bottom of the rectifier tank is connected with the bottom of the sedimentation tank; the sedimentation tank 9 is provided with a supernatant outlet pipe 11 with a diameter of DN100 at a height of 2.71m and passes through the rectifier tank, and a post-settlement mud outlet pipe 14 with a diameter of DN200 is provided at a height of 1.08m and passes through the rectifier tank; the supernatant discharge pipe passes through the rectifier tank, and a flow meter is installed on the pipeline, and the opening and closing of the electric valve of the mud outlet pipe is controlled by the electrical signal of the flow meter.

[0031] Mixing cylinder 1 inner diameter D 1 0.5m, the total height of the cylinder is 2.91m, and the inner diameter of the rectifying tank 8 is D 2 The inner diameter of the sedimentation tank 9 is 1.68m. 3The height of the mixing drum 1 and the rectifying tank 8 is 1.58m, and the height of the mixing drum 1 and the rectifying tank 8 are both 2.91m.

[0032] The moisture content of the sludge before conditioning is 98%, and the moisture content of the sludge after conditioning is 95% to 97%. The residence time of the mixed conditioning zone 2 is 0.5 min, and the effective volume is 0.531 m 3 The residence time of sedimentation zone 13 is 5 min and the effective volume is 5.31 m 3 The retention time of the annular water distribution area 12 is 0.65min, and the effective volume is 0.697m 3 The pump flow rate of mud inlet pipe 5 is about 63.72m 3 / h, PAC dosing pipe 3 adds PAC at 10% of the dry sludge weight, and PAM dosing pipe 4 adds PAM at 1‰ of the dry sludge weight. After the mud and water are separated by sedimentation, the supernatant is discharged from the supernatant outlet pipe 11, and the conditioned sludge is discharged from the post-settling mud outlet pipe 14 set in the sedimentation area 13.

[0033] The three tank bodies of the device are all made of Q235A steel. Both the inside and outside of the tank bodies are required to be treated with anti-corrosion, and are coated with epoxy coal tar primer and topcoat. The anti-corrosion process requirements for the inner side of the tank body are higher than those for the outer side because of its direct contact with the sludge. Fixed supports are set at the bottom of each tank body of the device to ensure the stability of the device. The supports are fixed with short-arm ear type, and pads are welded at the connection with the tank body.

[0034] The utility model is a step-cylinder type sludge conditioning and separation device that operates as follows:

[0035] Step 1: Sludge and 10% PAC and 1‰ PAM on a dry basis of sludge are simultaneously pumped into the mixing drum from the mud inlet pipe at the bottom of the device (the flow rate in the pipe is 1m / s) and enter the mixing and conditioning area. After hitting the drum wall, the water body is broken into countless micro-clusters. Under the action of shear force, a large number of vortex groups of different sizes are formed. Under the action of inertial centrifugal effect, the sludge flow in the drum spirals up, and the large vortex gradually diffuses into smaller and more numerous small vortices, accelerating the mixing and conditioning of the sludge. After 0.5 minutes, the sludge fills the stirring and conditioning area.

[0036] Step 2: When the mud level in the mixing drum rises to 2.71m, the sludge flows into the rectification tank through the mud outlet pipe after mixing and enters the annular water distribution area. The sludge flowing into the rectification tank has a fast flow rate and hits the outer wall of the sedimentation tank to consume kinetic energy. The sludge after rectification in the annular water distribution area flows into the sedimentation area from the bottom of the sedimentation tank.

[0037] Step 3: After the sludge flows into the sedimentation area, the hydraulic disturbance to the sludge is close to zero, and it enters the sedimentation and separation stage. The sludge sedimentation time is 5 minutes. At this time, the flow rate of the sludge inlet pipe is 0.0177m 3 / s, and after 5.65 minutes, the sludge filled the sedimentation area and the annular water distribution area. The water levels in the three areas were similar, and an obvious mud-water boundary appeared.

[0038] Step 4: After the sludge sedimentation and separation is completed, the supernatant liquid level reaches 2.71m, reaching the bottom elevation of the supernatant discharge pipe. The supernatant discharge pipe valve opens, and the supernatant overflows to the subsequent production wastewater treatment device.

[0039] Step 5: The accumulated flow rate of the flow meter in the supernatant discharge pipe reaches 1.77m 3 When the electric valve of the mud discharge pipe is opened, 2.124m3 of mud is discharged within 2 minutes. 3 After the sludge is settled, it is ensured that the water level of the continuously entering sludge will not exceed the supernatant liquid outflow pipe, and the device can enter continuous operation.

[0040] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A stepped cylindrical sludge conditioning and separation device, characterized in that: It includes a mud inlet pipe, a dosing pipe, a mixing cylinder, a mud outlet pipe after mixing, a rectifying tank, a sedimentation tank, a supernatant outlet pipe and a mud outlet pipe after sedimentation; the dosing pipe, the mud outlet pipe after sedimentation and the supernatant outlet pipe are all installed with electric valves; an electric valve is arranged at the inlet of the mud inlet pipe, and a check valve is arranged at the outlet of the mud inlet pipe; the mud inlet pipe is connected to the mixing cylinder vertically and tangent to the bottom surface of the cylinder, and the upper part of the mixing cylinder is connected to the rectifying tank through the mud outlet pipe after mixing; the rectifying tank and the sedimentation tank are connected with a sleeve The top of the sedimentation tank is fixedly connected to the upper bottom surface of the rectifying tank and is arranged inside the rectifying tank; a supernatant outlet pipe is arranged on the upper part of the sedimentation tank and passes through the side wall of the rectifying tank; a post-settling mud outlet pipe is arranged in the middle part of the sedimentation tank and passes through the rectifying tank; a mixing and conditioning area is formed inside the mixing cylinder; the area enclosed by the inner wall of the rectifying tank and the outer wall of the sedimentation tank forms an annular water distribution area, and the bottom of the rectifying tank is connected with the bottom of the sedimentation tank; a sedimentation area is formed inside the sedimentation tank.

2. The step-cylinder sludge conditioning and separation device according to claim 1, characterized in that: The inner diameter range of the mud inlet pipe is set to DN100-DN200; the inner diameter range of the dosing pipe is set to DN10-DN50.

3. The step-cylinder sludge conditioning and separation device according to claim 1, characterized in that: The dosing pipe includes a PAC dosing pipe and a PAM dosing pipe, and is connected to the mud inlet pipe in the form of a branch pipe between the electric valve and the check valve.

4. The step-cylinder sludge conditioning and separation device according to claim 1, characterized in that: A flow meter is installed on the supernatant outlet pipe to record the water flow rate, and the opening and closing of the electric valve of the mud outlet pipe is controlled by the electric signal of the flow meter.

5. The step-cylinder sludge conditioning and separation device according to claim 1, characterized in that: The diameter of the mixed mud outlet pipe is set to DN150, and the diameter of the supernatant outlet pipe is set to DN100.

6. The step-cylinder sludge conditioning and separation device according to claim 1, characterized in that: The inner diameter of the mixing cylinder is set to a range of 0.3 to 0.5 m, and the height-to-diameter ratio is set to a range of 5 to 10.

7. The step-cylinder sludge conditioning and separation device according to claim 1, characterized in that: The difference in inner diameters between the rectifying tank and the settling tank is in the range of 0.05 to 0.10 m, and the difference in height is in the range of 0.1 to 0.4 m.

8. The step-cylinder sludge conditioning and separation device according to claim 1, characterized in that: A supernatant discharge pipe is set at H on the top of the sedimentation tank, and a mud discharge pipe after sedimentation is set at 0.4H.

9. The step-cylinder sludge conditioning and separation device according to claim 8, characterized in that: The diameter of the mud discharge pipe after sedimentation is set to DN200; the mud discharge pipe after sedimentation is connected to a mud suction pump.

10. The step-cylinder sludge conditioning and separation device according to claim 1, characterized in that: A fixed support is arranged at the bottom of each tank body of the device to ensure the stability of the device. The support is fixed in a short-arm ear-type manner, and a pad is welded at the connection with the tank body.

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