Vertical flow type sedimentation device capable of synchronously settling mud and discharging slag and control method

Abstract

The invention relates to the technical field of sewage treatment, in particular to a vertical-flow type sedimentation device capable of synchronously settling sludge and discharging slag and a control method.The vertical-flow type sedimentation device comprises an outer pool body, a water inlet guide cylinder, a scum collecting tank, a sludge hopper and a control system, and the water inlet guide cylinder is vertically fixed in the outer pool body; a water inlet guide pipe is arranged above the water inlet guide cylinder and connected with external sewage through a water inlet, a guide structure is arranged at the bottom of the water inlet guide cylinder, and a sludge hopper is arranged below the guide structure; the scum collection system comprises a scum collection tank, the scum collection tank is arranged above the water inlet guide cylinder in a sleeving manner, the water outlet end of the scum collection tank is communicated with the water outlet, and a scum discharge end of the scum collection tank is provided with a scum discharge tank communicated with the scum discharge port. The atmosphere communicating pipe for ensuring that the running water level is higher than the water outlet hole position is arranged on the water outlet pipe, so that scum does not flow out along with the effluent; in addition, automatic hydraulic deslagging is realized by automatically opening and closing the water outlet and controlling the liquid level in the device.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a vertical flow sedimentation device with synchronous sludge settling and slag discharge and a control method thereof. Background Art

[0002] For wastewater with complex components such as septic tank cleaning wastewater and decentralized rural sewage, the suspended matter components are complex, containing both easily sludge with a specific gravity greater than 1 and a large amount of floating impurities with a specific gravity less than 1. If these easily sludge and suspended matter are not removed first when using biochemical methods to treat such wastewater, they will cause serious interference to the subsequent biological treatment unit and may even cause the collapse of the biological treatment system. Therefore, pretreatment measures must be taken to remove the easily sludge and suspended matter in the water before it can enter the biological treatment unit.

[0003] Sludge is usually removed by sedimentation units, but floating impurities cannot be removed by sedimentation and are usually removed by flotation. Therefore, a special scum removal unit is required to use the buoyancy of bubbles to bring floating impurities to the water surface to form scum, which is then removed by a special scum removal unit. This not only increases the complexity of the sewage treatment system, increases the difficulty of operation, but also increases the project investment. This disadvantage has a greater impact in systems with small water volumes, because for small water volume systems, adding additional treatment units will not only take up more space resources, but also increase operating costs and maintenance difficulties. Summary of the invention

[0004] In view of the problem of complex floating impurity treatment systems in small water volume systems in the prior art, the present invention provides a vertical flow sedimentation device with synchronous sludge settling and slag discharge and a control method.

[0005] The present invention is achieved through the following technical solutions: A vertical flow sedimentation device for synchronous sludge settling and slag discharge comprises an outer tank body, a water inlet guide tube, a scum collecting trough, a sludge bucket and a control system. The outer tank body is provided with a scum discharge port, a water inlet, a water outlet and a sludge discharge port from top to bottom. The water inlet guide tube is vertically fixed inside the outer tank body. A water inlet guide pipe is arranged above the water inlet guide tube and is connected with external sewage through the water inlet. A guide structure is arranged at the bottom of the water inlet guide tube. A sludge bucket is arranged below the guide structure, and the sludge bucket is connected with the sludge discharge port through a sludge discharge pipe. The sludge collection system comprises a sludge collection trough, which is sleeved above the water inlet guide tube. The water outlet end of the sludge collection trough is connected with the water outlet. The sludge discharge end of the sludge collection trough is provided with a sludge discharge trough connected with the sludge discharge port. The water outlet is provided with a water outlet valve, and the sludge discharge port is provided with a sludge discharge normally closed valve. The control ends of the water outlet valve and the sludge discharge normally closed valve are both connected with the output end of the control system.

[0006] Preferably, the slag collecting trough is fixed to the inside of the outer tank body through a collecting trough bracket, and the slag discharge trough is in the form of a triangular weir.

[0007] Preferably, a perforated water collecting pipe is provided below the scum collecting tank. The perforated water collecting pipe is annular and has a plurality of water collecting holes formed thereon. The plurality of water collecting holes are evenly spaced along a horizontal center line of the water collecting pipe.

[0008] Preferably, a water outlet vent pipe is also provided on the perforated water collecting pipe, one end of the water outlet vent pipe is connected to the perforated water collecting pipe, and the other end is bent upward to communicate with the atmosphere.

[0009] Preferably, an outlet pipe is provided on the outlet vent pipe, one end of the outlet pipe is connected to the outlet vent pipe, and the other end is connected to the water outlet of the outer pool body, and the connection point between the outlet pipe and the outlet vent pipe is higher than the water inlet hole of the water collecting pipe.

[0010] Preferably, the guide structure includes a guide tube bell mouth and a guide plate, and the end of the guide tube bell mouth with a smaller cross-section is connected to the water inlet guide tube, and the other end is connected to the guide plate.

[0011] Preferably, the water flow velocity of the water inlet guide tube is not greater than 0.2 m / s, and the enlargement ratio of the guide tube bell mouth is 1:1.5~2.

[0012] Preferably, the inlet end of the mud discharge pipe is connected with a mud discharge bell mouth, the ratio of the enlarged opening diameter of the mud discharge bell mouth to the pipe diameter of the mud discharge pipe is 4-6:1, and the ratio of the height of the bell mouth to the pipe diameter of the mud discharge pipe is 5-8:1.

[0013] A control method for a vertical flow sedimentation device with synchronous sludge and slag discharge is characterized in that the control system realizes automatic discharge of slag by controlling the opening and closing of the water outlet by the valve: When the water outlet is opened, the liquid level of the water outlet pipe remains constant due to its connection with the atmosphere, the liquid level in the water inlet guide tube remains unchanged, and the scum is above the water outlet pipe and below the scum collecting tank; When the outlet is closed, the liquid level in the sedimentation device rises under the action of water inflow. When it exceeds the height of the triangular weir of the slag discharge trough, the floating slag is flushed into the slag discharge trough under the action of water flow and discharged from the slag discharge pipe. When the slag discharge operation cycle reaches normal water discharge for 30 to 60 minutes, close the valve of the water outlet to allow the device to reach the slag discharge liquid level; after 2 to 5 minutes of slag discharge, open the valve of the water outlet to enter the normal operation state; The sludge discharge operation cycle is to open the sludge discharge normally closed valve 50 to 60 minutes after normal water discharge, and the sludge at the bottom of the pool is quickly discharged under the action of hydrostatic pressure. The sludge discharge time is controlled to be 3 to 5 minutes before closing the sludge discharge normally closed valve.

[0014] Preferably, the opening action of the normally closed valve for mud discharge and the closing action of the water outlet valve cannot be performed at the same time.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The vertical flow sedimentation device for synchronous sludge and slag discharge of the present invention can realize the simultaneous completion of sludge sedimentation removal and slag hydraulic removal in a single treatment unit by setting a guide plate, a water inlet guide tube and a slag collection tank, thereby simplifying the process flow. In addition, the automatic hydraulic slag discharge is realized by controlling the liquid level in the device through the automatic opening and closing of the water outlet. The device has a simple structure, no vulnerable parts, convenient operation and good treatment effect. Specifically, the sewage containing floating objects and sludge is connected to the water inlet guide tube through a pipe from the water inlet. The sewage flows upward under the action of the guide plate. The sludge with a specific gravity greater than 1 in the sewage is precipitated into the sludge bucket and is connected to the sludge discharge port through the sludge discharge bell mouth and the connecting pipe; the sludge in the sewage floats to the upper part and is discharged from the device through the sludge discharge port.

[0016] Furthermore, when the height exceeds the triangular weir of the slag discharge trough, the floating slag is flushed into the slag discharge trough under the action of the water flow and discharged from the slag discharge pipe.

[0017] Furthermore, a water outlet vent pipe is provided on the water outlet pipe to ensure that the operating water level is higher than the water outlet hole position, thereby ensuring that the scum does not flow out with the outlet water. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a vertical flow sedimentation device with synchronous sludge settling and slag discharge according to the present invention; Figure 2 It is a top view of a vertical flow sedimentation device with synchronous sludge settling and slag discharge according to the present invention; Figure 3 yes Figure 1 1-1 cross-sectional top view; Figure 4 yes Figure 1 2-2 cross-sectional top view; Figure 5 yes Figure 2 3-3 section front view; Figure 6 yes Figure 2 Front view of section 4-4. In the figure, 1, water inlet; 2, scum discharge outlet; 3, water outlet; 4, mud discharge outlet; 5, water inlet guide tube; 6, scum collecting trough; 7, bracket; 8, perforated water collecting pipe; 9, water outlet vent pipe; 10, guide tube bell mouth; 11, guide plate; 12, water outlet pipe; 13, sludge bucket; 14, mud discharge bell mouth. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0020] The present invention discloses a vertical flow sedimentation device with synchronous sludge settling and slag discharge, referring to Figures 1 to 6 ,, including an outer tank body, a water inlet guide tube 5, a scum collecting trough 6, a sludge bucket 13 and a control system. The outer tank body is provided with a scum discharge port 2, a water inlet 1, a water outlet 3 and a sludge discharge port 4 from top to bottom. The water inlet guide tube 5 is vertically fixed inside the outer tank body. A water inlet guide pipe is arranged above the water inlet guide tube 5 and is connected with external sewage through the water inlet 1.

[0021] Reference Figure 5 , 6 The bottom of the water inlet guide tube 5 is provided with a guide structure, which includes a guide tube bell mouth 10 and a guide plate 11. The end of the guide tube bell mouth 10 with a smaller cross section is connected to the water inlet guide tube 5, and the other end is connected to the guide plate 11. In this embodiment, the water flow velocity in the guide tube is not greater than 0.2m / s, and the enlargement ratio of the guide tube bell mouth 10 is 1:1.5~2. The guide plate 11 not only guides the water flow to form an upward vortex, causing light scum to float to the water surface, but also utilizes its reflection effect to allow some fine particles that fail to settle directly to have a chance to be captured again, thereby enhancing the sedimentation effect.

[0022] A sludge bucket 13 is arranged below the diversion structure, that is, a sludge bucket 13 is arranged below the diversion plate 11. The sludge bucket 13 is connected to the sludge discharge port 4 through a sludge discharge pipe. The sludge discharge port 4 is provided with a sludge discharge normally closed valve. The control end of the sludge discharge normally closed valve is connected to the output end of the control system. A sludge discharge bell mouth 14 is arranged at one end of the sludge discharge pipe close to the sludge bucket 13. The ratio of the enlarged opening diameter of the sludge discharge bell mouth 14 to the diameter of the sludge discharge pipe is 4 to 6:1. The ratio of the height of the sludge discharge bell mouth 14 to the diameter of the sludge discharge pipe is 5 to 8:1. The sludge discharge bell mouth 14 increases the outlet diameter and height ratio, thereby ensuring that the sludge can be discharged smoothly under the action of gravity and reducing the risk of blockage. The sludge discharge normally closed valve is connected to the control system and can be automatically opened or closed according to the accumulation of sludge in the sludge bucket 13, so as to realize timed or on-demand sludge discharge, thereby improving the accuracy and efficiency of sludge discharge.

[0023] Reference Figure 5 The scum collection system includes a scum collection trough 6, which is sleeved above the water inlet guide tube 5, the water outlet end of the scum collection trough 6 is connected to the water outlet 3, and the scum discharge end of the scum collection trough 6 is provided with a scum discharge trough connected to the scum discharge port 2. In this embodiment, the scum collection trough 6 is fixed to the inside of the outer tank body through the collection trough bracket 7, and the scum discharge trough adopts the form of a triangular weir, the height and width ratio of the scum discharge trough is 1.5~2:1, and the height of the trough is 200~300mm. The scum collection trough 6 uses the water level difference and the principle of natural buoyancy to effectively collect and isolate the scum, and adopts the triangular weir design, which not only ensures the smooth discharge of the scum, but also prevents excessive disturbance of the water flow.

[0024] In order to ensure the uniform discharge of water in the sedimentation tank, a perforated water collecting pipe 8 is provided below the scum collecting tank 6. The perforated water collecting pipe 8 is used to discharge water. The perforated water collecting pipe 8 is annular and has multiple water collecting holes. The multiple water collecting holes are evenly spaced along the horizontal center line of the water collecting pipe to prevent scum from being brought into the water outlet system. Figure 4 In this embodiment, the water collecting pipe is in a square ring shape, the diameter of the water collecting hole is 20mm, and the interval is 50mm. After the water collecting pipe is gathered, a water outlet vent pipe 9 is led out, which is bent upward and communicated with the atmosphere. The outlet pipe 12 is connected to the water outlet 3 of the outer tank body through the outlet pipe 12. The starting end of the outlet pipe 12 is connected to the upward bent pipe section of the water collecting pipe, and the elevation of the connection point between the two is more than 250mm higher than the water inlet space of the water collecting pipe to ensure that the water surface elevation of the sedimentation tank will submerge the entire water collecting pipe, so that the outlet water is not affected by scum.

[0025] The water outlet 3 is provided with a water outlet valve, the control end of the water outlet valve is connected to the output end of the control system, and the control system realizes automatic discharge of scum by controlling the opening and closing of the water outlet 3 by the valve.

[0026] The implementation principle of the vertical flow sedimentation device with synchronous sludge settling and slag discharge of the present invention is as follows: sewage containing floating objects and sludge is connected to the water inlet guide tube 5 through a pipe from the water inlet 1, and an enlarged bell mouth and a reflective guide plate 11 are provided at the bottom of the guide tube. The sewage flows upward under the action of the guide plate 11, and the sludge with a specific gravity greater than 1 in the sewage is settled in the sludge hopper and is connected to the sludge discharge port 4 through the sludge discharge bell mouth 14 and the connecting pipe; the scum in the sewage floats to the upper part, and a sludge collection tank 6 bracket 7 is provided below the working water level of the sedimentation device, on which a sludge collection tank 6 is installed, and a perforated water collecting pipe 8 is installed below it, and the perforated water collecting pipe 8 is provided with a water outlet pipe 12 vent hole, and is connected to the water outlet 3 through the water outlet pipe 12; the debris collected in the sludge collection tank 6 is discharged from the device through the sludge discharge port 2.

[0027] The outlet 3 of a vertical flow sedimentation device with synchronous sludge and slag discharge of the present invention is equipped with a normally open valve, and the slag discharge port is directly connected to a pipeline, so as to control the switch of the water outlet 3 of the system to realize the automatic discharge of slag; specifically, when the water outlet 3 is opened, the liquid level of the water outlet pipe 12 in the device is always kept constant due to the connection with the atmosphere, and when the water outlet 3 is closed, the liquid level in the device rises under the action of water inflow, and when it exceeds the height of the triangular weir of the slag discharge trough, the slag is flushed into the slag discharge trough under the action of water flow, and discharged from the slag discharge pipeline. The control system can automatically adjust the water inlet flow rate, sludge discharge frequency and slag discharge timing according to multi-dimensional parameters such as the water level in the sedimentation tank, the amount of sludge accumulation, and the effluent water quality, so as to realize the intelligent management of the entire sedimentation process and improve the processing efficiency and operation stability.

[0028] The present invention also discloses an automatic discharge method for synchronous scum discharge, wherein the control system realizes automatic discharge of scum by controlling the valve to switch the water outlet 3: When the water outlet 3 is opened, the liquid level of the water outlet pipe 12 is always kept constant due to its connection with the atmosphere, and the liquid level in the water inlet guide tube 5 remains unchanged; When the water outlet 3 is closed, the liquid level in the device rises under the action of water inflow. When it exceeds the height of the triangular weir of the slag discharge trough, the floating slag is flushed into the slag discharge trough under the action of water flow and discharged from the slag discharge pipe. When the slag discharge operation cycle reaches normal water discharge for 30 to 60 minutes, close the valve of outlet 3 to allow the device to reach the slag discharge liquid level; after 2 to 5 minutes of slag discharge, open the valve of outlet 3 to enter the normal operation state; The sludge discharge operation cycle is to open the sludge discharge normally closed valve 50 to 60 minutes after normal water discharge, and the sludge at the bottom of the pool is quickly discharged under the action of hydrostatic pressure. The sludge discharge time is controlled to be 3 to 5 minutes before closing the sludge discharge normally closed valve.

[0029] The opening action of the normally closed valve for mud discharge and the closing action of the water outlet valve cannot be performed at the same time.

[0030] Taking the scum treatment of a sedimentation tank as an example, the suspended solids content in the sewage is 300 mg / L. Based on this, the relevant parameters of the synchronous scum discharge device provided by the present invention are as follows: the diameter of the water inlet guide tube 5 is 300 mm, the water flow velocity in the guide tube is 0.15 m / s, and the enlargement ratio of the guide tube bell mouth 10 is 1:2; the diameter of the mud discharge pipe is 100 mm, the enlarged diameter of the mud discharge bell mouth 14 is 400 mm, and the height of the bell mouth is 500 mm; the height of the triangular weir type scum discharge trough is 3 00mm, the width is 200mm, the height of the groove is 200~300mm; the diameter of the annular water collecting pipe is DN200, and a circular hole with a diameter of 20mm is opened in the middle with a spacing of 50mm. The water collecting pipes converge to one point and bend upward to communicate with the atmosphere; the pipe of the water outlet 3 is connected from the vent pipe position 500mm higher than the water collecting perforation, so that the operating water level of the device is flush with the connection of the vent pipe outlet pipe 12, so as to ensure that the water surface elevation of the sedimentation tank will submerge the water collecting pipe completely, so that the outlet water is not affected by the scum.

[0031] Only when the water outlet 3 is closed and the device of the present invention only takes in water but does not discharge water, the liquid level rises again, allowing the scum layer to rise and exceed the height of the scum collecting tank 6, and then enters the slag discharge state. During slag discharge, the slag discharge operation cycle is 60 minutes after normal water discharge, closing the water outlet 3 valve to allow the device to reach the slag discharge liquid level, and 2 minutes after slag discharge, opening the water outlet valve to enter the normal operation state; the mud discharge operation cycle is 40 minutes after normal water discharge, opening the mud discharge normally closed valve, and the sludge at the bottom of the pool is quickly discharged under the action of hydrostatic pressure, and the mud discharge time is controlled to be 2 minutes before closing the mud discharge valve; the mud discharge valve opening and the water outlet valve closing cannot be performed at the same time.

[0032] After being treated by the device provided by the present invention, SS can be reduced to 120-160 mg / L, and more than 95% of fine floating objects can be removed.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and substitutions, and these modifications and substitutions are also within the scope of protection covered by the claims.

Claims

1. A vertical flow sedimentation device with synchronous sludge and slag discharge, characterized in that: The invention comprises an outer tank body, a water inlet guide tube (5), a scum collecting tank (6), a sludge bucket (13) and a control system. The outer tank body is provided with a scum discharge port (2), a water inlet (1), a water outlet (3) and a sludge discharge port (4) from top to bottom. The water inlet guide tube (5) is vertically fixed inside the outer tank body. A water inlet guide pipe is arranged above the water inlet guide tube (5) and is connected to external sewage through the water inlet (1). A guide structure is arranged at the bottom of the water inlet guide tube (5). A sludge bucket (13) is arranged below the guide structure. The bucket (13) is connected to the mud discharge port (4) through a mud discharge pipe; the scum collection system comprises a scum collection trough (6), the scum collection trough (6) is sleeved above the water inlet guide tube (5), the water outlet end of the scum collection trough (6) is connected to the water outlet (3), and the scum discharge end of the scum collection trough (6) is provided with a scum discharge trough connected to the scum discharge port (2); the water outlet (3) is provided with a water outlet valve, and the mud discharge port (4) is provided with a mud discharge normally closed valve, and the control ends of the water outlet valve and the mud discharge normally closed valve are both connected to the output end of the control system.

2. The vertical flow sedimentation device with synchronous sludge settling and slag discharge according to claim 1 is characterized in that: The slag collecting trough (6) is fixed inside the outer tank body via a collecting trough bracket (7), and the slag discharge trough is in the form of a triangular weir.

3. The vertical flow sedimentation device with synchronous sludge settling and slag discharge according to claim 2 is characterized in that: A perforated water collecting pipe (8) is arranged below the scum collecting tank (6). The perforated water collecting pipe (8) is annular and has a plurality of water collecting holes formed thereon. The plurality of water collecting holes are evenly spaced along the horizontal center line of the water collecting pipe.

4. The vertical flow sedimentation device with synchronous sludge settling and slag discharge according to claim 3 is characterized in that: A water outlet vent pipe (9) is also provided on the perforated water collecting pipe (8), one end of the water outlet vent pipe (9) is communicated with the perforated water collecting pipe (8), and the other end is bent upward to communicate with the atmosphere.

5. The vertical flow sedimentation device with synchronous sludge settling and slag discharge according to claim 4 is characterized in that: A water outlet pipe (12) is arranged on the water outlet vent pipe (9), one end of the water outlet pipe (12) is connected to the water outlet vent pipe (9), and the other end is connected to the water outlet (3) of the outer pool body, and the connection point between the water outlet pipe (12) and the water outlet vent pipe (9) is at a higher elevation than the water inlet hole of the water collecting pipe.

6. The vertical flow sedimentation device with synchronous sludge settling and slag discharge according to claim 1, characterized in that: The flow guide structure comprises a flow guide tube bell mouth (10) and a flow guide plate (11); the end of the flow guide tube bell mouth (10) with a smaller cross section is connected to the water inlet flow guide tube (5), and the other end is connected to the flow guide plate (11).

7. The vertical flow sedimentation device with synchronous sludge settling and slag discharge according to claim 6 is characterized in that: The water flow velocity of the water inlet guide tube (5) is not greater than 0.2 m / s, and the enlargement ratio of the guide tube bell mouth (10) is 1:1.5-2.

8. The vertical flow sedimentation device with synchronous sludge settling and slag discharge according to claim 1, characterized in that: The inlet end of the mud discharge pipe is connected with a mud discharge bell mouth (14), the ratio of the enlarged diameter of the mud discharge bell mouth (14) to the pipe diameter of the mud discharge pipe is 4-6:1, and the ratio of the height of the bell mouth to the pipe diameter of the mud discharge pipe is 5-8:

1.

9. A control method for a vertical flow sedimentation device with synchronous sludge settling and slag discharge according to any one of claims 1 to 8, characterized in that: The control system realizes the automatic discharge of scum by controlling the opening and closing of the valve to the water outlet (3): When the water outlet (3) is opened, the liquid level of the water outlet pipe (12) is always kept constant due to its connection with the atmosphere, the liquid level in the water inlet guide tube (5) remains unchanged, and the scum is above the water outlet pipe (12) and below the scum collecting tank (6); When the water outlet (3) is closed, the liquid level in the sedimentation device rises under the action of the inflowing water. When it exceeds the height of the triangular weir of the slag discharge trough, the floating slag is flushed into the slag discharge trough under the action of the water flow and discharged from the slag discharge pipe. When the slag discharge operation cycle reaches normal water discharge for 30 to 60 minutes, the valve of the water outlet (3) is closed to allow the device to reach the slag discharge liquid level; after 2 to 5 minutes of slag discharge, the valve of the water outlet (3) is opened to enter the normal operation state; The sludge discharge operation cycle is to open the sludge discharge normally closed valve 50 to 60 minutes after normal water discharge, and the sludge at the bottom of the pool is quickly discharged under the action of hydrostatic pressure. The sludge discharge time is controlled to be 3 to 5 minutes before closing the sludge discharge normally closed valve.

10. The control method of a vertical flow sedimentation device with synchronous sludge settling and slag discharge according to claim 9, characterized in that: The opening action of the normally closed valve for mud discharge and the closing action of the water outlet valve cannot be performed at the same time.

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