A sludge thickening device and method for an integrated aeration sedimentation tank

Abstract

This application provides a sludge thickening device and method for an integrated aeration sedimentation tank, comprising: a tank with a conical zone at the bottom; a sludge inlet pipe with a dosing pipe connected in parallel at the top, the bottom end of the sludge inlet pipe passing through the center of the tank; sludge distribution pipes arranged in a cross shape and connected to the sludge inlet pipe; supernatant collection pipes distributed in the upper and middle parts of the tank and connected in parallel to the outlet; and an ultrasonic sludge level gauge fixed on one side of the top surface of the tank. By providing a dosing pipe and a pipe mixer at the front end of the sludge inlet pipe, the flocculant can be fully mixed with the sludge water in the pipe. By providing a sludge distribution pipe at the tail end of the sludge inlet pipe, the sludge mixed with the flocculant is evenly distributed throughout the tank, which can improve the sludge dewatering efficiency. At the same time, the conical zone can increase the sludge concentration, and a self-cleaning filter screen is provided above the sludge distribution pipe to further filter the sludge and improve the sludge dewatering speed.

Description

Technical Field

[0001] This invention relates to the field of sludge thickening, and more specifically, to a sludge thickening device and method for an integrated aeration and sedimentation tank. Background Technology

[0002] With the continuous development and upgrading of wastewater treatment technology, the new integrated aeration sedimentation tank technology reduces the footprint by combining the sedimentation tank and the aerobic tank in situ, while increasing the treatment capacity, and has broad market potential.

[0003] Ordinary sedimentation tanks can discharge high-concentration sludge at the bottom after gravity concentration and sedimentation. However, the integrated aeration sedimentation tank technology uses a three-phase separator and selects the aerobic tank for sludge discharge. Therefore, the sludge concentration is significantly lower, and it is necessary to further increase the sludge concentration, reduce the water content, and reduce the volume to reduce sludge transportation costs and meet the sludge inlet requirements of traditional sludge dewatering devices.

[0004] Therefore, we have made improvements to this by proposing an integrated aeration sedimentation tank sludge thickening device and method. Summary of the Invention

[0005] The purpose of this invention is to address the current issues of low sludge concentration in aerobic tanks and insufficient dewatering effect of traditional sludge dewatering devices in terms of sludge moisture content and concentration.

[0006] To achieve the above-mentioned objectives, the present invention provides a sludge thickening device and method for an integrated aeration sedimentation tank, in order to improve the aforementioned problems.

[0007] The application is as follows:

[0008] A sludge thickening device for an integrated aeration sedimentation tank includes:

[0009] Tank with a conical section at the bottom;

[0010] A mud inlet pipe with a dosing pipe connected in parallel at the top, the bottom end of which passes through the center of the tank body;

[0011] The mud distribution pipes are arranged in a cross shape and connected to the mud inlet pipe;

[0012] Supernatant collection pipes are distributed in the upper and middle parts of the tank and connected in parallel with the outlets;

[0013] An ultrasonic mud level gauge fixed to one side of the top surface of the tank;

[0014] A flow-blocking one-way valve with valve plates elastically connected on both sides and return springs elastically connected to the ends of the valve plates, the flow-blocking one-way valve being fixed at the middle of the bottom end of the mud inlet pipe;

[0015] The filter surface has a self-cleaning filter screen with overlapping and elastic restoring structure. The self-cleaning filter screen is fixed inside the tank above the flow-blocking one-way valve and is connected to the inside of the sludge inlet pipe.

[0016] The sludge is mixed with chemicals through the dosing pipe at the front end of the sludge inlet pipe and flows into the area above the flow-blocking check valve. The sludge above the flow-blocking check valve flows into the self-cleaning filter, which drives the filter to open. The sludge above the flow-blocking check valve is blocked, increasing its kinetic energy and driving the flow-blocking check valve to open. The sludge above the flow-blocking check valve flows into the sludge distribution pipe through its valve port. The sludge inside the sludge distribution pipe is evenly distributed throughout the tank. The sludge inside the tank is separated into mud and water by the self-cleaning filter.

[0017] As a preferred technical solution of this application, the bottom end of the conical area is connected to a sludge discharge electric valve, the sludge discharge port below the sludge discharge electric valve is connected to a sludge discharge pipe, and the bottom end of the tank connected to the conical area is fixed with annularly distributed support columns.

[0018] As a preferred technical solution of this application, a pipeline mixer is connected to the middle of the front end of the sludge inlet pipe, the dosing pipe is connected to the sludge inlet pipe at the position in front of the pipeline mixer, a dosing electric valve is connected to the middle of the dosing pipe, a dosing flow meter is connected to the end of the dosing pipe away from the sludge inlet pipe, a dosing pump is connected to the bottom end of the dosing flow meter, a sludge discharge flow meter is connected to the top of the front end of the sludge inlet pipe, and an aerobic zone sludge discharge pump is connected to the end of the sludge discharge flow meter away from the sludge inlet pipe.

[0019] As a preferred technical solution of this application, a diversion box is provided at one end of the mud distribution pipe connected to the mud inlet pipe, the mud distribution pipe is connected in parallel to the bottom end of the mud inlet pipe through the diversion box, and mud distribution holes are provided on both sides of the mud distribution pipe at equal intervals.

[0020] As a preferred technical solution of this application, the supernatant collection pipe includes a middle pipe and an upper pipe. The middle pipe is horizontally inserted through the middle of the tank, and the upper pipe is horizontally inserted through the top of the tank. The top of the middle pipe and the upper pipe are provided with equally spaced arc-shaped holes. The end of the upper pipe away from the tank bends to the bottom and connects with the middle pipe. The end of the middle pipe away from the tank is connected to an intermediate water level electric valve. The outlet of the intermediate water level electric valve is connected to a clean water pipe, and a clean water pump is connected to the middle of the clean water pipe.

[0021] As a preferred technical solution of this application, an online turbidity meter is provided on the outer side of the front of the tank, and the water inlets at the upper and lower ends of the online turbidity meter are connected to the upper and lower sides inside the tank.

[0022] As a preferred technical solution of this application, the flow-blocking one-way valve includes a valve stem, both ends of which are fixed to the inner wall of the mud inlet pipe. Symmetrical first hinge rods are provided at the bottom of both sides of the valve stem. A spring-loaded spring is sleeved at both ends of the first hinge rod. A valve plate is sleeved on the outside of the first hinge rod. The valve plate is elastically connected to the first hinge rod through the spring-loaded spring. A second hinge rod is provided at the bottom of the end of the valve plate away from the first hinge rod. A return spring is sleeved on the outside of the second hinge rod. Return springs are hinged at both ends of the second hinge rod. The return springs are elastically connected to the second hinge rod through the return spring. Symmetrical valve plate limiting boxes are fixed on both sides of the outer wall of the mud inlet pipe where it connects to the flow-blocking one-way valve. A movable cavity is opened inside the valve plate limiting box. A return spring is provided inside the movable cavity. A sliding plate is provided at the end of the return spring near the mud inlet pipe. A wedge rod is fixed on the side of the sliding plate away from the return spring. The wedge rod passes through the inside of the mud inlet pipe. The bottom of the outer wall of the return spring abuts against the surface of the wedge rod.

[0023] As a preferred technical solution of this application, the self-cleaning filter screen includes a fixed ring frame, which is fixed to the inner wall of the tank. A cross-shaped isolation frame is connected to the middle of the fixed ring frame. The fixed ring frame forms a fan-shaped filtration area of ​​equal size through the cross-shaped isolation frame. Fixed filter screens are provided on both sides of the symmetrical ends of the fan-shaped filtration area. Fan-shaped sliding areas are opened on the other two sides of the fan-shaped filtration area. A sliding filter screen is provided inside the fan-shaped sliding area. A front end baffle is connected to one end of the sliding filter screen. The bottom surface of one end of the front end baffle slides against the top surface of the fan-shaped sliding area. A positioning slide rod is provided on the outside of the sliding filter screen. One end of the positioning slide rod is fixed to the side of the front end baffle, and the other end of the positioning slide rod is opposite to the center of the fixed ring frame. The fixed ring frame is close to the positioning slide rod. A positioning drive hole is provided at the center of one side of the rod. The positioning slide rod slides inside the positioning drive hole. A tail scraper is fixed at the end of the sliding filter screen away from the front end baffle. A self-cleaning limiting groove is provided near the tail scraper of the cross isolation frame. The end of the sliding filter screen away from the front end baffle slides against the inner side of the self-cleaning limiting groove. The side of the tail scraper is against the outer wall of the self-cleaning limiting groove. The bottom surface of the tail scraper is against the top surface of the fixed filter screen. A return pull block is fixed at the end of the sliding filter screen near the center of the cross isolation frame. A diversion drive pipe is connected above the end of the positioning drive hole away from the positioning slide rod. The other end of the diversion drive pipe is connected to the inside of the sludge inlet pipe. A small sludge discharge hole is provided at the end of the positioning drive hole away from the positioning slide rod.

[0024] As a preferred technical solution of this application, a return ring frame is fixed on both sides of the center of the cross isolation frame. An arc-shaped groove is opened on the outer side of the return ring frame. A return spring is provided inside the arc-shaped groove. One end of the return spring is fixed to the arc-shaped groove, and the other end of the return spring is fixed to the outer wall of the return block. The return block slides inside the arc-shaped groove. The outer side of the front end baffle is connected to vertical plates arranged at equal intervals. Symmetrical through-hole cones are fixed on both sides of the bottom end of the vertical plates. The through-hole cones are inserted into the mud-closing holes.

[0025] This invention provides a method for using an integrated aeration sedimentation tank sludge thickening device, comprising the following steps:

[0026] S1: The aerobic zone sludge pump discharges sludge of lower concentration to the sludge discharge pipe, and the sludge discharge flow meter records the sludge discharge flow rate;

[0027] S2: The flocculant enters the dosing pipe through the dosing pump, the dosing electric valve controls the flow rate, and the dosing flow meter records the flow rate. The flocculant and sludge are mixed and reacted fully through the pipeline mixer.

[0028] S3: After mixing, the sludge accumulates pressure at the one-way valve position and simultaneously flows into the positioning drive hole through the diversion drive pipe. The sludge entering the positioning drive hole pushes the positioning slide rod to cause the sliding filter screen and the fixed filter screen to unfold alternately. The unfolding of the sliding filter screen and the fixed filter screen form a ring closure.

[0029] S4: After the self-cleaning filter screen is unfolded, the sludge pressure rushes through the flow-blocking one-way valve and reaches the sludge distribution pipe through the sludge inlet pipe, forming a stable flow state and dispersing in the sludge distribution holes.

[0030] S5: The mixed sludge enters the tank. The upward-flowing sludge is blocked by the self-cleaning filter screen to separate the sludge and water. The sludge below, under the continuous action of stable flow and relative residence time, undergoes full chemical flocculation. At the same time, gravity separates the sludge and water. The more concentrated sludge gradually settles in the conical area of ​​the tank. The separated water forms the supernatant.

[0031] S6: During the continuous mud-water separation process, the ultrasonic mud level gauge monitors the height of the bottom sediment sludge, and the adjustable turbidity meter monitors the clarity of the effluent.

[0032] S7: The dosing and sludge discharge flow rates are controlled by the feedback data from the ultrasonic sludge level meter and turbidity meter to achieve the required control parameters; after the supernatant reaches the required clarity, it enters the supernatant collection pipe and is discharged by the clear water pump through the clear water pipe. The requirements for clear water discharge are determined by the quality of the clear water.

[0033] S8: Due to the significant reduction in volume after sludge concentration, only intermittent sludge discharge is required. The sludge layer height is monitored by an ultrasonic sludge level meter and a turbidity meter. Once the control parameters are met, the sludge is further concentrated in the conical zone of the tank. The discharge of concentrated sludge is controlled by the tank discharge electric valve. The concentrated sludge is discharged to the sludge storage area through the tank discharge pipe. Once the storage capacity requirements are met, it can be transported to a filter press or dryer for processing.

[0034] S9: The above-mentioned sludge thickening and supernatant drainage can be operated continuously and for a long time. If the aerobic zone of the aeration sedimentation integrated tank completes the set volume of sludge discharge, the dosing and aerobic zone sludge discharge pump operation can be stopped. After stopping for a period of time, the intermediate water level electric valve can be opened to discharge most of the clear water in the tank. The tank sludge discharge electric valve can be opened for a short time to remove some of the remaining concentrated sludge and lower the liquid level to below the sludge distribution pipe.

[0035] S10: Before the next round of sludge discharge begins, due to the inclined surface of the conical area of ​​the tank, the sludge remains here in the anaerobic environment, producing relatively light floating sludge. The sludge discharge pump in the aerobic zone can be turned on for a short time to discharge sludge at a high flow rate. The sludge is effectively distributed through the sludge distribution pipe, which can mix and settle the floating sludge on the liquid surface under the sludge distribution pipe again. There may still be a small amount of floating sludge. The floating sludge can be quickly removed through the arc-shaped structure of the supernatant collection pipe. That is, the initial sludge cannot be directly used as the final effluent discharge. It needs to enter the high-efficiency or equalization tank. After that, further operations can be carried out.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] In the scheme of this application: by setting a dosing pipe and a pipeline mixer at the front end of the sludge inlet pipe, the flocculant can be fully mixed with the sludge water in the pipeline. By setting a sludge distribution pipe at the tail end of the sludge inlet pipe, the sludge mixed with the drug is evenly distributed throughout the tank, which can improve the sludge dewatering efficiency. At the same time, the cone-shaped area can increase the sludge concentration. A self-cleaning filter screen is set above the sludge distribution pipe, which can further filter the sludge and improve the sludge dewatering speed.

[0038] 1. The present invention has a dosing pipe connected to the top of the sludge inlet pipe, and a dosing pump and a dosing electric valve to control the dosing amount, which can realize the automatic addition of drugs to the sludge. At the same time, a pipe mixer is provided in the middle of the sludge inlet pipe, which can mix the drugs after dosing with the sludge water, so that the sludge can quickly settle and complete the sludge-water separation when the sludge water is discharged.

[0039] 2. The present invention has a sludge distribution pipe with a cross-shaped distribution and multiple sludge distribution holes at the tail end of the sludge inlet pipe, which can evenly transport the sludge water after mixing with the drug to all parts of the tank, so that the sludge can maintain uniformity during sedimentation and improve the sludge compaction inside the cone zone. The supernatant collection pipe set in the middle and upper part of the tank can quickly collect the clean water, so that the tank can complete the sludge concentration work quickly and without stopping.

[0040] 3. The present invention has a self-cleaning filter screen above the mud distribution pipe and a flow-blocking one-way valve located inside the mud distribution pipe. When the mud distribution pipe is working, the filter screen can be used to close the upper part of the mud distribution pipe, reducing the path of sludge flowing upward, thereby realizing the rapid sedimentation and compression of sludge inside the tank. Furthermore, when the tank is used intermittently to compress sludge, the surface of the filter screen can be automatically cleaned by the flow of sludge water. Attached Figure Description

[0041] Figure 1 A schematic diagram of the overall structure of an integrated aeration sedimentation tank sludge thickening device and method provided by the present invention;

[0042] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the middle section of the tank.

[0043] Figure 3 for Figure 2 The diagram shown is a schematic of the mud inlet pipe.

[0044] Figure 4 for Figure 2 The diagram shown is an exploded view of the internal structure of the tank.

[0045] Figure 5 for Figure 4 The diagram shows a structure where the supernatant collection pipe is separated from the sludge inlet pipe.

[0046] Figure 6 for Figure 5 The diagram shows a bottom view of the mud distribution pipe.

[0047] Figure 7 for Figure 6 The diagram shows the disassembled structure of the mud-distributing pipe and the self-cleaning filter.

[0048] Figure 8 for Figure 7 A schematic diagram showing a cross-section of the middle section of the mud distribution pipe;

[0049] Figure 9 for Figure 8 The diagram shows a cross-sectional view of the tail end of the mud inlet pipe.

[0050] Figure 10 for Figure 9 The diagram shown is a cross-sectional exploded and enlarged structural schematic of the flow-blocking check valve.

[0051] Figure 11 for Figure 7 The diagram shown is a magnified view of the structural breakdown of the self-cleaning filter.

[0052] Figure 12 for Figure 11The diagram shown is a cross-sectional exploded view of the repositioning ring frame.

[0053] The image shows:

[0054] 1. Tank body; 11. Conical zone; 12. Electric sludge discharge valve; 13. Sludge discharge pipe; 14. Support column;

[0055] 2. Sludge inlet pipe; 21. Pipeline mixer; 22. Dosing pipe; 23. Electric dosing valve; 24. Dosing flow meter; 25. Dosing pump; 26. Sludge discharge flow meter; 27. Aerobic zone sludge discharge pump;

[0056] 3. Sludge distribution pipe; 31. Diversion box; 32. Sludge distribution hole;

[0057] 4. Supernatant collection pipe; 41. Middle pipe; 42. Upper pipe; 43. Arc-shaped orifice; 44. Intermediate water level electric valve; 45. Clean water pipe; 46. Clean water pump;

[0058] 5. Ultrasonic mud level meter; 51. Online turbidity meter;

[0059] 6. Flow-blocking check valve; 61. Valve stem; 62. First hinge rod; 63. Valve plate; 64. Spring-loaded spring; 65. Second hinge rod; 66. Return spring; 67. Return spring; 68. Valve plate limit box; 681. Movable cavity; 682. Return spring; 683. Sliding plate; 684. Wedge rod;

[0060] 7. Self-cleaning filter; 71. Fixing ring frame; 72. Cross-shaped isolation frame; 73. Fan-shaped filter area; 74. Fixing filter; 75. Fan-shaped sliding area;

[0061] 76. Sliding filter screen; 761. Front end baffle; 762. Positioning slide bar; 763. Tail end scraper; 764. Return pull block; 765. Self-cleaning limit groove; 766. Positioning drive hole; 767. Diversion drive pipe; 768. Sludge discharge hole;

[0062] 77. Returning ring frame; 771. Arc-shaped pull groove; 772. Returning tension spring; 773. Vertical plate; 774. Through hole cone. Detailed Implementation

[0063] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0064] As described in the background section, the sludge concentration in the aerobic tank is low, and the traditional sludge dewatering device has insufficient dewatering effect in terms of sludge moisture content and sludge concentration during sludge discharge.

[0065] To address this technical problem, the present invention provides an integrated aeration sedimentation tank sludge thickening device and method, which reduces the water content of sludge discharged from aerobic tanks, increases sludge concentration, and reduces sludge transportation costs.

[0066] For details, please refer to Figures 1-12 The aforementioned sludge thickening device for an integrated aeration sedimentation tank specifically includes:

[0067] Tank 1 with a conical section 11 at the bottom;

[0068] A mud inlet pipe 2 with a chemical dosing pipe 22 connected in parallel at the top, and the bottom end of the mud inlet pipe 2 is inserted into the center of the tank body 1.

[0069] The mud distribution pipes 3 are arranged in a cross shape and connected to the mud inlet pipe 2;

[0070] Supernatant collection pipes 4 are distributed in the upper and middle parts of tank 1 and connected in parallel with the outlets;

[0071] An ultrasonic mud level gauge 5 is fixed to one side of the top surface of tank 1;

[0072] A flow-blocking one-way valve 6 is elastically connected to valve plates 63 on both sides and elastically connected to a return spring 66 at the end of the valve plates 63. The flow-blocking one-way valve 6 is fixed at the middle of the bottom end of the mud inlet pipe 2.

[0073] The filter surface has a self-cleaning filter screen 7 with overlapping and elastic restoring structure. The self-cleaning filter screen 7 is fixed inside the tank 1 above the flow-blocking one-way valve 6. The self-cleaning filter screen 7 is connected to the inside of the mud inlet pipe 2.

[0074] The sludge is mixed with chemicals by the dosing pipe 22 at the front end of the sludge inlet pipe 2 and flows into the area above the flow-blocking one-way valve 6. The sludge above the flow-blocking one-way valve 6 flows into the self-cleaning filter 7 and drives it to open. The sludge above the flow-blocking one-way valve 6 is blocked and its kinetic energy increases, which drives the flow-blocking one-way valve 6 to open. The sludge above the flow-blocking one-way valve 6 flows into the sludge distribution pipe 3 through its valve port. The sludge inside the sludge distribution pipe 3 is evenly distributed in various places inside the tank 1. The sludge inside the tank 1 is blocked and separated into mud and water by the self-cleaning filter 7.

[0075] The present invention provides a sludge thickening device for an integrated aeration sedimentation tank. By providing a dosing pipe 22 and a pipe mixer 21 at the front end of the sludge inlet pipe 2, the flocculant can be fully mixed with the sludge water in the pipe. By providing a sludge distribution pipe 3 at the tail end of the sludge inlet pipe 2, the sludge mixed with the drug is evenly distributed throughout the tank 1, which can improve the sludge dewatering efficiency. At the same time, the cone-shaped zone 11 can increase the sludge concentration. The sludge distribution pipe 3 is provided with a self-cleaning filter screen 7, which can further filter the sludge and improve the sludge dewatering speed.

[0076] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0077] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other.

[0078] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0079] Example 1

[0080] Please refer to Figures 1-12 A sludge thickening device for an integrated aeration sedimentation tank, wherein the bottom end of the conical zone 11 is connected to a sludge discharge electric valve 12, the sludge discharge electric valve 12 is connected to a sludge discharge pipe 13 at the sludge outlet below it, and the bottom end of the tank 1 is fixed with annularly distributed support columns 14 at equal intervals.

[0081] A pipe mixer 21 is connected to the middle of the front end of the sludge inlet pipe 2. The dosing pipe 22 is connected to the sludge inlet pipe 2 at the position in front of the pipe mixer 21. A dosing electric valve 23 is connected to the middle of the dosing pipe 22. A dosing flow meter 24 is connected to the end of the dosing pipe 22 away from the sludge inlet pipe 2. A dosing pump 25 is connected to the bottom end of the dosing flow meter 24. A sludge discharge flow meter 26 is connected to the top of the front end of the sludge inlet pipe 2. An aerobic zone sludge discharge pump 27 is connected to the end of the sludge discharge flow meter 26 away from the sludge inlet pipe 2.

[0082] The top of the sludge inlet pipe 2 is equipped with a dosing pipe 22 connected to it, and a dosing pump 25 and a dosing electric valve 23 are provided to control the dosing amount, which can realize the automatic addition of drugs to the sludge. At the same time, a pipe mixer 21 is provided in the middle of the sludge inlet pipe 2, which can mix the drugs after dosing with the sludge water, so that the sludge can quickly settle and complete the sludge-water separation when the sludge water is discharged.

[0083] Example 2

[0084] The sludge thickening device for an integrated aeration sedimentation tank provided in Example 1 has been further optimized, specifically, as follows: Figures 1-12 The mud distribution pipe 3 is connected to the mud inlet pipe 2 at one end and is provided with a diversion box 31. The mud distribution pipe 3 is connected in parallel to the bottom end of the mud inlet pipe 2 through the diversion box 31. Mud distribution holes 32 are provided on both sides of the mud distribution pipe 3 at equal intervals.

[0085] The supernatant collection pipe 4 includes a middle pipe 41 and an upper pipe 42. The middle pipe 41 is horizontally inserted through the middle of the tank body 1, and the upper pipe 42 is horizontally inserted through the top of the tank body 1. The top of the middle pipe 41 and the upper pipe 42 are provided with equally spaced arc-shaped holes 43. The end of the upper pipe 42 away from the tank body 1 bends to the bottom and connects to the middle pipe 41. The end of the middle pipe 41 away from the tank body 1 is connected to an intermediate water level electric valve 44. The outlet of the intermediate water level electric valve 44 is connected to a clean water pipe 45. A clean water pump 46 is connected to the middle of the clean water pipe 45.

[0086] An online turbidity meter 51 is provided on the outer side of the front of the tank body 1, and the water inlets at the upper and lower ends of the online turbidity meter 51 are connected to the upper and lower sides inside the tank body 1.

[0087] The tail end of the mud pipe 2 is provided with a cross-shaped mud distribution pipe 3 with multiple mud distribution holes 32 opened laterally. This can evenly transport the sludge water after it has been mixed with the drug to all parts of the tank 1, so that the sludge can maintain uniformity during sedimentation and improve the sludge compaction inside the cone zone 11. Meanwhile, the supernatant collection pipe 4 set in the middle and upper part of the tank 1 can quickly collect the clean water, so that the tank 1 can complete the sludge concentration work quickly and without stopping.

[0088] Example 3

[0089] The sludge thickening device for an integrated aeration sedimentation tank provided in Example 1 or 2 is further optimized, specifically, as follows: Figures 1-12As shown, the flow-blocking one-way valve 6 includes a valve stem 61, with both ends of the valve stem 61 fixed to the inner wall of the mud inlet pipe 2. Symmetrical first hinge rods 62 are threaded through the bottom of both sides of the valve stem 61. A spring-loaded spring 64 is sleeved at both ends of the first hinge rod 62. A valve plate 63 is sleeved on the outside of the first hinge rod 62 and is elastically connected to the first hinge rod 62 via the spring-loaded spring 64. A second hinge rod 65 is threaded through the bottom of the end of the valve plate 63 away from the first hinge rod 62. A return spring 67 is sleeved on the outside of the second hinge rod 65, and return spring pieces 66 are hinged to both ends of the second hinge rod 65. The positioning spring 66 is elastically connected to the second hinge rod 65 via the return spring 67. Symmetrical valve plate limiting boxes 68 are fixed on both sides of the outer wall of the mud inlet pipe 2 where it connects to the flow-blocking one-way valve 6. The valve plate limiting box 68 has a movable cavity 681 inside. The movable cavity 681 is equipped with a return spring 682. The end of the return spring 682 near the mud inlet pipe 2 is equipped with a sliding plate 683. A wedge rod 684 is fixed on the side of the sliding plate 683 away from the return spring 682. The wedge rod 684 passes through the inside of the mud inlet pipe 2. The bottom of the outer wall of the positioning spring 66 abuts against the surface of the wedge rod 684.

[0090] The self-cleaning filter 7 includes a fixed ring frame 71, which is fixed to the inner wall of the tank 1. A cross-shaped isolation frame 72 is connected to the middle of the fixed ring frame 71. The fixed ring frame 71 forms a fan-shaped filtration area 73 of equal size through the cross-shaped isolation frame 72. Fixed filter screens 74 are provided on both sides of the symmetrical ends of the fan-shaped filtration area 73. Fan-shaped sliding areas 75 are opened on the other two sides of the fan-shaped filtration area 73. Sliding filter screens 76 are provided inside the fan-shaped sliding areas 75. A front end baffle 76 is connected to one end of the sliding filter screen 76. The bottom surface of one end of the front end baffle 761 slides against the top surface of the fan-shaped sliding area 75. A positioning slide rod 762 is provided on the outside of the sliding filter screen 76. One end of the positioning slide rod 762 is fixed to the side of the front end baffle 761. The other end of the positioning slide rod 762 is opposite to the center of the fixed ring frame 71. A positioning drive is opened at the center of the side of the fixed ring frame 71 near the positioning slide rod 762. Hole 766, the positioning slide rod 762 slides inside the positioning drive hole 766, the end of the sliding filter 76 away from the front end baffle 761 is fixed with a tail end scraper 763, the cross isolation frame 72 has a self-cleaning limiting groove 765 near the tail end scraper 763, the end of the sliding filter 76 away from the front end baffle 761 slides against the inner side of the self-cleaning limiting groove 765, and the side of the tail end scraper 763 is against the outer side of the self-cleaning limiting groove 765. The bottom surface of the tail scraper 763 is attached to the top surface of the fixed filter screen 74. The sliding filter screen 76 is fixed with a return pull block 764 at one end near the center of the cross isolation frame 72. The upper part of the positioning drive hole 766 away from the positioning slide rod 762 is connected to the diversion drive pipe 767. The other end of the diversion drive pipe 767 is connected to the inside of the mud inlet pipe 2. The end of the positioning drive hole 766 away from the positioning slide rod 762 is provided with a mud discharge hole 768.

[0091] The cross-shaped isolation frame 72 has two fixed return ring frames 77 on both sides at its center. The outer side of the return ring frame 77 has an arc-shaped groove 771. The arc-shaped groove 771 has a return spring 772 inside. One end of the return spring 772 is fixed to the arc-shaped groove 771, and the other end is fixed to the outer wall of the return pull block 764. The return pull block 764 slides inside the arc-shaped groove 771. The outer side of the front end baffle 761 is connected to vertical plates 773 arranged at equal intervals. The bottom two sides of the vertical plates 773 are fixed with symmetrical through-hole cones 774. The through-hole cones 774 are inserted into the mud hole 32.

[0092] The sludge distribution pipe 3 is equipped with a self-cleaning filter screen 7 and a flow-blocking one-way valve 6 located inside the sludge distribution pipe 3. When the sludge distribution pipe 3 is working, the filter screen can be used to close the top of the sludge distribution pipe 3, reducing the path of sludge flowing upward, thereby achieving rapid sedimentation and compression of sludge inside the tank 1. Furthermore, when the tank 1 is used intermittently to compress sludge, the filter screen surface can be automatically cleaned by the flow of sludge water.

[0093] Please see Figures 1-12 The present invention provides a method for using an integrated aeration sedimentation tank sludge thickening device, the method comprising the following steps:

[0094] S1: The aerobic zone sludge pump 27 discharges sludge of lower concentration to the sludge discharge pipe 13, and the sludge discharge flow meter 26 records the sludge discharge flow rate.

[0095] S2: The flocculant enters the dosing pipe 22 through the dosing pump 25, the dosing electric valve 23 controls the flow rate, and the dosing flow meter 24 records the flow rate. The flocculant and sludge are mixed and reacted fully through the pipe mixer 21.

[0096] S3: After mixing, the sludge builds up pressure at position 6 of the flow-blocking one-way valve and simultaneously flows into the positioning drive hole 766 through the diversion drive pipe 767. The sludge entering the positioning drive hole 766 pushes the positioning slide rod 762 to cause the sliding filter screen 76 and the fixed filter screen 74 to unfold alternately. The sliding filter screen 76 unfolds and forms a ring closure with the fixed filter screen 74.

[0097] S4: After the self-cleaning filter screen 7 is unfolded, the sludge pressure rushes through the flow-blocking one-way valve 6 and reaches the sludge distribution pipe 3 through the sludge inlet pipe 2, forming a stable flow state and dispersing in the sludge distribution hole 32.

[0098] S5: The mixed sludge enters the tank 1. The upward-flowing sludge is blocked by the self-cleaning filter 7 to separate the sludge and water. The sludge below, under the continuous action of stable flow and relative residence time, undergoes full chemical flocculation. At the same time, gravity separates the sludge and water. The more concentrated sludge gradually settles in the conical area 11 of the tank 1. The separated water forms the supernatant.

[0099] S6: During the continuous mud-water separation process, the ultrasonic mud level gauge 5 monitors the height of the bottom sediment sludge, and the adjustable turbidity meter monitors the clarity of the effluent.

[0100] S7: The dosing and sludge discharge flow rates are controlled by the feedback data from the ultrasonic sludge level meter 5 and the turbidity meter to achieve the required control parameters; after the supernatant reaches the required clarity, it enters the supernatant collection pipe 4 and is discharged by the clear water pump 46 through the clear water pipe 45. The requirements for clear water discharge are determined by the quality of the clear water.

[0101] S8: Due to the significant reduction in volume after sludge concentration, only intermittent sludge discharge is required. The sludge layer height is monitored by the ultrasonic sludge level gauge 5 and the turbidity meter. Once the control parameters are met, the sludge is further concentrated in the conical zone 11 of tank 1. The discharge of concentrated sludge is controlled by the electric sludge discharge valve 12 of tank 1. The concentrated sludge is discharged to the sludge storage area through the sludge discharge pipe 13 of tank 1. Once the storage capacity requirements are met, it can be transported to a filter press or dryer for processing.

[0102] S9: The above-mentioned sludge thickening and supernatant drainage can be operated continuously and for a long time. If the aerobic zone of the aeration sedimentation integrated tank completes the set volume of sludge discharge, the dosing and aerobic zone sludge discharge pump 27 can be stopped. After stopping for a period of time, the intermediate water level electric valve 44 can be opened to discharge most of the clear water in tank 1. The sludge discharge electric valve 12 of tank 1 can be opened for a short time to remove some of the remaining concentrated sludge and lower the liquid level to below the sludge distribution pipe 3.

[0103] S10: Before the next round of sludge discharge begins, due to the inclined surface of the conical zone 11 of tank 1, the sludge remains here in the anaerobic environment and produces relatively light floating sludge. The sludge discharge pump 27 in the aerobic zone can start a large flow of sludge discharge in a short time. The sludge is effectively distributed through the sludge distribution pipe 3, which can mix and settle the floating sludge on the liquid surface under the sludge distribution pipe 3 again. There may still be a small amount of floating sludge. The floating sludge can be quickly removed through the arc-shaped structure of the supernatant collection pipe 4. That is, the initial sludge cannot be directly used as the final effluent discharge. It needs to enter the high-efficiency or equalization tank. After completion, further operations can be carried out.

[0104] The usage process of the sludge thickening device for an integrated aeration sedimentation tank provided by this invention is as follows:

[0105] The aerobic zone sludge pump 27 draws sludge and transports it into the tank 1 through the sludge inlet pipe 2. During the sludge transport at the front end of the sludge inlet pipe 2, the sludge flow meter 26 records the sludge flow rate. At the same time, the dosing pump 25 at the bottom of the dosing pipe 22 delivers flocculant into the sludge inlet pipe 2, allowing the sludge to mix with the agent. During the agent transport, the dosing flow meter 24 records the dosage. The dosing electric valve 23 opens during dosing to prevent sludge from entering the dosing pipe 22. After dosing, the sludge passes through the pipeline mixer 21 to fully mix the agent with the sludge.

[0106] After mixing, the sludge is transported to the flow-blocking check valve 6 at the end of the sludge inlet pipe 2. Due to the obstruction of the flow-blocking check valve 6 by the wedge rod 684, the sludge will accumulate at the end of the sludge inlet pipe 2. At this time, as the internal pressure of the sludge inlet pipe 2 increases, the sludge will flow through the diversion drive pipe 767 into the positioning drive hole 766. As the sludge enters the positioning drive hole 766, the pressure of the sludge will push the positioning slide rod 762 to slide outward. At the same time, the positioning slide rod 762 will drive the front end baffle 761 and the sliding filter screen 76 connected to its front end to slide. The sliding filter screen 76 will slide and intersect with the fixed filter screen 74, so that the fan-shaped filtration area 73 is completely covered and closed by the filter screen, ensuring the separation of the upper and lower sides inside the tank 1, and at the same time, it is conducive to improving the filtration and sedimentation effect of the sludge.

[0107] It should be noted that although there is a sludge discharge hole 768 at the tail of the positioning drive hole 766, the sludge pressure is greater than the amount of sludge discharged through the sludge discharge hole 768. Therefore, the sludge can continue to push the positioning slide rod 762 while the sludge is being discharged through the sludge discharge hole 768. At the same time, when the equipment is not in use, the sludge will be pushed through the positioning slide rod 762 by the return spring 772 and discharged through the sludge discharge hole 768, so there will be no sludge blockage.

[0108] During the sliding process of the sliding filter screen 76, the return block 764 in the middle will pull the return spring 772 to stretch and store energy.

[0109] During the sliding process of the front baffle 761, the vertical plate 773 will be moved synchronously. The sliding of the vertical plate 773 will cause the through hole cone 774 to slide. When the sliding filter screen 76 is completely closed, the through hole cone 774 will be inserted into the mud hole 32, realizing the function of blocking the through hole inside the mud hole 32.

[0110] After the self-cleaning filter 7 is fully deployed, the increased internal pressure of the sludge inlet pipe 2 will push the flow-blocking check valve 6, making the downward pressure of the valve plate 63 greater than the return spring 682 that pushes the wedge rod 684. This causes the wedge rod 684 to retract into the movable cavity 681, completing the deployment of the valve plate 63. When the valve plate 63 is deployed, the sludge enters the sludge distribution pipe 3 and is distributed to various parts of the tank 1 through the sludge distribution holes 32 on both sides of the sludge distribution pipe 3. The sludge that falls to the top of the tank 1 with the water flow through the sludge distribution holes 32 will remain below the tank 1 under the obstruction of the fixed filter screen 74 and the sliding filter screen 76, thus achieving the function of sludge filtration and concentration.

[0111] When the sludge inside the tank 1 settles into the conical zone 11 after a long period of sedimentation and filtration, and there is clean water inside the tank 1, the clean water pump 46 is started, and the clean water inside the upper part of the tank 1 can be discharged through the upper pipe 42, so that the tank 1 can continue to concentrate the sludge.

[0112] When tank 1 is used intermittently, the intermediate water level electric valve 44 is opened and the clean water pump 46 is started, which can simultaneously discharge the clean water in the upper middle part of tank 1.

[0113] After the equipment is used and shut down, no more sludge will enter through the sludge inlet pipe 2. The valve plate 63 of the flow-blocking one-way valve 6 inside the sludge inlet pipe 2 will rotate upward under the elastic force of the spring 64. During the rotation of the valve plate 63, the return spring plate 66 at the end of the valve plate 63 will abut against the wedge rod 684. At this time, the return spring plate 66 will rotate and store energy in the return spring 67. When the return spring plate 66 rotates until the wedge rod 684 disengages, the return spring plate 66 will rotate under the elastic force of the return spring 67 to be parallel to the valve plate 63, so that the valve plate 63 can block the inside of the sludge inlet pipe 2.

[0114] When the mud inlet pipe 2 is not under pressure, the sliding filter screen 76 will be pulled by the return spring 772 connected to the return pull block 764 to rotate, causing the sliding filter screen 76 to rotate upwards towards the fixed filter screen 74, thereby completing the shrinkage of the self-cleaning filter screen 7.

[0115] During the shrinking process of the self-cleaning filter 7, the upper and lower surfaces of the sliding filter 76 are scraped off by the self-cleaning limiting groove 765. The sludge on the top surface of the fixed filter 74 is pushed by the tail scraper 763 to fall into the conical area 11 at the bottom of the tank 1 when the sliding filter 76 slides, thus completing the self-cleaning of the self-cleaning filter 7.

[0116] When the sliding filter screen 76 is pulled back to its original position by the return spring 772, it drives the positioning slide rod 762 to slide into the positioning drive hole 766. During the sliding process, the positioning slide rod 762 pushes the sludge inside the positioning drive hole 766 to move into the sludge discharge hole 768 at the tail, so that the sludge is discharged through the sludge discharge hole 768, thereby realizing the reset function of the positioning slide rod 762 retracting into the positioning drive hole 766.

[0117] When the equipment is used intermittently, the rented filter can continuously self-clean, ensuring its filtration performance.

[0118] In this invention, the ratio of flocculant to sludge water is as follows:

[0119] PAC 20mg-30mg / L;

[0120] PAM 2mg-5mg / L.

[0121] The pore size of all filters in the self-cleaning filter of this invention is:

[0122] 300nm-600nm;

[0123] In this invention, the ratio of flocculant to wastewater is such that the coagulated sludge is larger than the filter screen pore size, thus the filter screen can block the sludge from flowing upward and accelerate sludge sedimentation and concentration.

[0124] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0125] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A sludge thickening device for an integrated aeration sedimentation tank, characterized in that, include: Tank with a conical section at the bottom; The top of the mud inlet pipe is connected in parallel with the dosing pipe, and the bottom of the mud inlet pipe is inserted into the center of the tank. The mud distribution pipes are arranged in a cross shape and connected to the mud inlet pipe; Supernatant collection pipes are distributed in the upper and middle parts of the tank and connected in parallel with the outlets; An ultrasonic mud level gauge fixed to one side of the top surface of the tank; A flow-blocking check valve with valve plates elastically connected on both sides and return springs elastically connected to the ends of the valve plates is fixed at the middle of the bottom end of the mud inlet pipe. The filter surface has a self-cleaning filter screen with interlaced and elastically resettable features. The self-cleaning filter screen is fixed inside the tank above the flow-blocking check valve and is connected to the inside of the sludge inlet pipe. The sludge is mixed with chemicals through the dosing pipe at the front end of the sludge inlet pipe and flows into the area above the flow-blocking check valve. The sludge above the flow-blocking check valve flows into the self-cleaning filter screen, which drives it to expand. The sludge above the flow-blocking check valve is blocked, which increases its kinetic energy and drives the flow-blocking check valve to open. The sludge above the flow-blocking check valve flows into the sludge distribution pipe through its valve port. The sludge inside the sludge distribution pipe is evenly distributed throughout the tank. The sludge inside the tank is separated into mud and water by the self-cleaning filter screen. The flow-blocking check valve includes a valve stem with both ends fixed to the inner wall of the mud inlet pipe. Symmetrical first hinge rods are provided at the bottom of both sides of the valve stem. A spring-loaded spring is fitted at both ends of the first hinge rod. A valve plate is fitted on the outside of the first hinge rod and is elastically connected to the first hinge rod through the spring-loaded spring. A second hinge rod is provided at the bottom of the end of the valve plate away from the first hinge rod. A return spring is fitted on the outside of the second hinge rod. Return springs are hinged at both ends of the second hinge rod and are elastically connected to the second hinge rod through the return spring. Symmetrical valve plate limiting boxes are fixed on both sides of the outer wall of the mud inlet pipe where it connects to the flow-blocking check valve. A movable cavity is opened inside the valve plate limiting box. A return spring is provided inside the movable cavity. A sliding plate is provided at the end of the return spring near the mud inlet pipe. A wedge rod is fixed on the side of the sliding plate away from the return spring. The wedge rod passes through the inside of the mud inlet pipe. The bottom of the outer wall of the return spring abuts against the surface of the wedge rod. The self-cleaning filter includes a fixed ring frame, which is fixed to the inner wall of the tank. A cross-shaped partition is connected to the middle of the fixed ring frame. The fixed ring frame forms equally sized fan-shaped filtration zones inside through the cross-shaped partition. Fixed filter screens are provided on both sides of the symmetrical ends of the fan-shaped filtration zones. Fan-shaped sliding zones are opened on the other two sides of the fan-shaped filtration zones. Sliding filter screens are provided inside the fan-shaped sliding zones. One end of the sliding filter screen is connected to a front end baffle. The bottom surface of one end of the front end baffle slides against the top surface of the fan-shaped sliding zone. A positioning slide rod is provided on the outside of the sliding filter screen. One end of the positioning slide rod is fixed to the side of the front end baffle, and the other end of the positioning slide rod is opposite to the center of the fixed ring frame. A positioning slide rod is opened at the center of the side of the fixed ring frame closest to the positioning slide rod. The positioning drive hole has a positioning slide rod that slides inside it. A tail scraper is fixed to the end of the sliding filter screen away from the front baffle. A self-cleaning limiting groove is provided near the tail scraper of the cross isolation frame. The end of the sliding filter screen away from the front baffle slides against the inner side of the self-cleaning limiting groove. The side of the tail scraper is against the outer wall of the self-cleaning limiting groove. The bottom surface of the tail scraper is against the top surface of the fixed filter screen. A return pull block is fixed to the end of the sliding filter screen near the center of the cross isolation frame. A diversion drive pipe is connected above the end of the positioning drive hole away from the positioning slide rod. The other end of the diversion drive pipe is connected to the inside of the sludge inlet pipe. A small sludge discharge hole is provided at the end of the positioning drive hole away from the positioning slide rod.

2. A sludge thickening device for an integrated aeration sedimentation tank according to claim 1, characterized in that, A sludge discharge electric valve is connected to the bottom of the conical section, and a sludge discharge pipe is connected to the sludge outlet below the sludge discharge electric valve. A ring of equally spaced support columns is fixed at the bottom of the tank where the conical section is connected.

3. A sludge thickening device for an integrated aeration sedimentation tank according to claim 2, characterized in that, A pipeline mixer is connected to the middle of the front end of the sludge inlet pipe. The dosing pipe is connected to the sludge inlet pipe in front of the pipeline mixer. A dosing electric valve is connected to the middle of the dosing pipe. A dosing flow meter is connected to the end of the dosing pipe away from the sludge inlet pipe. A dosing pump is connected to the bottom of the dosing flow meter. A sludge discharge flow meter is connected to the top of the front end of the sludge inlet pipe. An aerobic zone sludge discharge pump is connected to the end of the sludge discharge flow meter away from the sludge inlet pipe.

4. A sludge thickening device for an integrated aeration sedimentation tank according to claim 3, characterized in that, A diversion box is provided at one end of the mud distribution pipe that connects to the mud inlet pipe. The mud distribution pipe is connected in parallel to the bottom end of the mud inlet pipe through the diversion box. Mud distribution holes are arranged at equal intervals on both sides of the mud distribution pipe.

5. A sludge thickening device for an integrated aeration sedimentation tank according to claim 4, characterized in that, The supernatant collection pipe includes a middle pipe and an upper pipe. The middle pipe runs horizontally through the middle of the tank, and the upper pipe runs horizontally through the top of the tank. The top of the middle pipe and the upper pipe have equally spaced arc-shaped holes. The end of the upper pipe away from the tank bends to the bottom and connects with the middle pipe. The end of the middle pipe away from the tank is connected to an intermediate water level electric valve. The outlet of the intermediate water level electric valve is connected to a clean water pipe, and a clean water pump is connected to the middle of the clean water pipe.

6. A sludge thickening device for an integrated aeration sedimentation tank according to claim 5, characterized in that, An online turbidity meter is installed on the outer front of the tank, and the water inlets at both ends of the online turbidity meter are connected to the upper and lower sides inside the tank.

7. A sludge thickening device for an integrated aeration sedimentation tank according to claim 6, characterized in that, Two return ring frames are fixed on both sides of the center of the cross-shaped isolation frame. The outer wall of the return ring frame has an arc-shaped groove. A return spring is installed inside the arc-shaped groove. One end of the return spring is fixed to the arc-shaped groove, and the other end of the return spring is fixed to the outer wall of the return block. The return block slides inside the arc-shaped groove. The outer wall of the front end baffle is connected to vertical plates arranged at equal intervals. Symmetrical through-hole cones are fixed on both sides of the bottom end of the vertical plates. The through-hole cones are inserted into the mud-closing holes.

Images