An automated flocculant dosing and mixing device for treating river and lake sediment.

Abstract

This invention provides an automated flocculant dosing and mixing device for treating river and lake sediments. It includes a flow detection device, one end of which is connected to the outlet of a sediment pump, and the other end connected to an electric tubular mixer via a Venturi structure. A flocculant feeding device is mounted on the Venturi structure and is electrically connected to the flow detection device. The electric tubular mixer has a mixing tube outlet at its tail end, which is connected to a flocculation effect detection device and a geotextile bag via a T-joint. The mixing tube outlet outputs sediment mixed with flocculant. Part of the sediment output from the mixing tube outlet enters the geotextile bag for flocculation, while the other part enters the flocculation effect detection device for testing. The flocculation effect detection device is equipped with a flocculation effect information terminal, which is electrically connected to the flocculant feeding device. This invention simplifies the sediment treatment process and improves the efficiency of flocculation and mixing.

Description

Technical Field

[0001] This invention relates to the field of sediment flocculation treatment technology, specifically to an automated flocculant dosing and mixing device for treating river and lake sediment. Background Technology

[0002] River dredging and pond clearing projects generate large amounts of silt from river and lake bottoms. This silt is characterized by high water content, high compressibility, and high fluidity, making it difficult to meet the requirements for land transportation, recycling, and reuse without treatment. Furthermore, its accumulation at construction sites results in significant land occupation. Therefore, dewatering treatment of this river and lake silt is necessary. Dewatered silt has reduced fluidity, facilitating subsequent construction. In engineering practice, flocculation sedimentation is commonly used to treat high-water-content river and lake silt. This involves mixing the silt with appropriate flocculants, causing it to flocculate in a sedimentation tank, forming flocs, accelerating the settling of soil particles, and thus achieving solid-liquid separation.

[0003] However, existing engineering cases have shown that the traditional method of treating sludge using sedimentation tanks has many problems, such as the large footprint of sedimentation tanks, slow mixing of flocculants and bottom sludge, and difficulty in controlling the dosage of flocculants due to the inability to measure the flocculation effect. Existing technologies often suffer from drawbacks such as large footprint of mixing equipment, cumbersome operation of the mixing process, and uneven mixing, while flocculant addition equipment often suffers from the problem of not being able to add flocculants quantitatively, thus relying heavily on manual calculation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an automated flocculant dosing and mixing device for treating river and lake sediments. This invention simplifies the sediment treatment process and improves the efficiency of flocculation and mixing.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] An automated flocculant dosing and mixing device for treating river and lake bottom sediment is characterized by: a flow detection device, one end of which is connected to the outlet of the sediment pump's output pipe, and the other end of which is connected to an electric tubular agitator via a venturi structure. A flocculant feeding device is mounted on the venturi structure and is electrically connected to the flow detection device. The electric tubular agitator has a mixing tube outlet at its tail end, which is connected to a flocculation effect detection device and a geotextile bag via a tee connector. The mixing tube outlet outputs bottom sediment mixed with flocculant. Part of the sediment output through the mixing tube outlet enters the geotextile bag for flocculation, and the other part enters the flocculation effect detection device for testing. The flocculation effect detection device is equipped with a flocculation effect information terminal, which is electrically connected to the flocculant feeding device.

[0007] Furthermore: the flow detection device includes a pipeline flow meter and a flow information transmission terminal installed on the pipeline flow meter. One end of the pipeline flow meter is connected to the outlet of the bottom mud pump's output pipeline, and the other end of the pipeline flow meter is connected to an electric tubular agitator through a Venturi structure. The flow information transmission terminal is electrically connected to the flocculant feeding device. The pipeline flow meter can collect the flow velocity of the bottom mud in the output pipeline.

[0008] Furthermore: the flocculant feeding device includes a flow control valve and an information receiving and processing terminal. The information receiving and processing terminal is electrically connected to the flow detection device and the flocculation effect information terminal. The information receiving and processing terminal controls the opening degree of the flow control valve.

[0009] Furthermore: the Venturi structure includes a Venturi tube converging section, a Venturi tube throat, and a Venturi tube expanding section arranged sequentially. The Venturi tube converging section is connected to a flow detection device, and the Venturi tube expanding section is connected to an electric tubular stirring device. A grid plate is provided at the middle position of the Venturi tube expanding section.

[0010] Furthermore: the electric tubular stirring device includes a tubular shell, an end cap at the tail end of the tubular shell and a discharge port of the stirring tube, a stirring shaft rotatably connected inside the tubular shell, a turbine blade on the stirring shaft, the end of the stirring shaft extending out of the end cap and connected to the output end of the motor, and the stirring shaft and the end cap being rotatably connected.

[0011] Furthermore: the flocculation effect testing device includes a detachably connected upper half and a lower half, with a chromatography filter paper placed between the upper half and the lower half. The chromatography filter paper can move between the upper half and the lower half. The upper half is connected to one of the three-way pipe joints. The upper half has a feed inlet at its center, which communicates with the orifice of the joint. The lower half has a detection probe on the side that contacts the chromatography filter paper. The lower half has a discharge outlet at its center, which is used to detect the discharge of bottom sludge after the test is completed. The discharge outlet and the feed inlet are correspondingly provided.

[0012] Furthermore: the chromatography filter paper is segmented, and each segment of chromatography filter paper can complete one test. Each segment of chromatography filter paper is divided into a waste discharge segment and a test segment. The waste discharge segment has a long strip-shaped hole in the center with a length distributed along the moving direction of the chromatography filter paper. The test segment of chromatography filter paper is a blank, non-porous chromatography filter paper.

[0013] Furthermore: On the lower half, two sets of detection probes are sequentially arranged on the outside of the feed inlet according to their distance from the feed inlet; the processing flocculation effect information terminal is connected to the two sets of detection probes, and the processing flocculation effect information terminal is used to collect the time t1 and t2 when the two sets of detection probes detect bottom mud flowing through the chromatography filter paper, perform experimental calculations, and feed the calculation results back to the flocculant feeding device.

[0014] Furthermore: multiple sections of the chromatography filter paper can be wound and collected on a roller. There are two rollers, which are respectively connected to the first and second ends of the chromatography filter paper. The rollers can roll and drive the chromatography filter paper to move.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] (1) The pipeline flow meter of the present invention is connected to the outlet of the output pipeline of the mud pump, and the pipeline inlet of the mud pump is directly connected to the bottom silt of the river and lake. The large area and slow effect of the treatment tank are transferred to the tubular device and the stirring is driven by the motor, which simplifies the bottom silt treatment process and improves the efficiency of flocculation and stirring.

[0017] (2) The amount of flocculant added is controlled by the electrical signal of the flow detection device, which reduces the frequent operation of adding flocculant to the pool for stirring and sedimentation, improves the accuracy of flocculant addition, effectively improves the efficiency of the construction site, and saves time and labor costs.

[0018] (3) The flocculation effect of the current flocculant can be determined by testing the flocculation effect after discharge, and the optimal amount of flocculant can be determined by adjusting the flocculant input, so as to realize intelligent detection and control, effectively improve on-site efficiency, and save time costs and human resources.

[0019] (4) This invention proposes an integrated CST-T-connector structure, realizing the engineering application of laboratory equipment. The roller-filter paper structure allows for rapid filter paper replacement in the testing device, reducing manual operation and improving operational efficiency. The elongated pores in the chromatography filter paper allow the flocculated sludge to flow out quickly under its own weight and concentrate in the waste sludge bucket, reducing manual operation and improving operational efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the flocculant feeding device of the present invention;

[0022] Figure 3 This is a schematic diagram of the flow detection device of the present invention;

[0023] Figure 4This is a schematic diagram of the structure of the electric tubular stirring device of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection between the venturi structure and the tubular shell flange;

[0025] Figure 6 This is a schematic diagram showing the position inside the turbine blade tube;

[0026] Figure 7 This is a schematic diagram of a flocculation effect testing device;

[0027] Figure 8 This is a schematic diagram of the chromatography filter paper.

[0028] Figure 9 This is a flowchart of the optimal dosage test for flocculants.

[0029] Reference numerals: 1-Flow detection device; 2-Flocculant feeding device; 3-Electric tubular agitator; 4-Information receiving and processing terminal; 5-Flow control valve; 6-Flow information transmitting terminal; 7-Pipeline flow meter; 8-Venturi tube converging section; 9-Grid plate; 10-Venturi tube throat; 11-Venturi tube expanding section; 12-Agitator shaft; 13-Motor; 14-Cross plate; 15-Turbine blade; 16-End cap; 17-Tube shell; 18-Flange; 19-Tee pipe joint; 20-Treatment flocculation effect information terminal; 21-Flocculation effect detection device; 22-Agitator tube outlet; 23-Roller; 24-Fixing iron plate; 25-Upper section; 26-Lower section; 27-Chromatographic filter paper; 28-Detection probe; 29-Chromatographic filter paper waste discharge section; 30-Chromatographic filter paper test section. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0032] like Figures 1 to 9As shown, an automated flocculant dosing and mixing device for treating river and lake bottom sediment includes a flow detection device 1. One end of the flow detection device 1 is connected to the outlet of the bottom sediment pump's output pipe, and the other end of the flow detection device 1 is connected to an electric tubular mixing device 3 via a Venturi structure. A flocculant feeding device 2 is installed on the Venturi structure and is electrically connected to the flow detection device 1. The tail end of the electric tubular mixing device 3 is provided with a mixing tube outlet 22. The mixing tube outlet 22 is connected to a flocculation effect detection device 21 and a geotextile bag via a three-way pipe connector 19. The mixing tube outlet 22 outputs bottom sediment mixed with flocculant. Part of the bottom sediment output through the mixing tube outlet 22 enters the geotextile bag to complete flocculation, and the other part enters the flocculation effect detection device 21 for detection. The flocculation effect detection device 21 is provided with a flocculation effect information terminal 20, which is electrically connected to the flocculant feeding device 2. The specific implementation principle of the flocculation effect detection device 21 for measuring the flocculation effect is to measure the capillary water absorption time CST.

[0033] In this embodiment, the opening diameter of the joint 19 connected to the geotextile bag is larger than the opening diameter of the joint connected to the flocculation effect detection device 21, so that most of the bottom mud output through the discharge port 22 of the mixing pipe enters the geotextile bag to complete flocculation, and a small part of the bottom mud enters the flocculation effect detection device 21 for detection.

[0034] The flocculant feeding device 2 controls the amount of flocculant added based solely on the flow detection device 1 and the flocculation effect detection device 21. When processing the same batch of sludge, the flow detection device 1 only measures the flow rate of the bottom sludge in the pipe and outputs data for a short period after the bottom sludge is initially input. After mixing is completed, the flocculation effect detection device 21 starts to detect the flocculation effect and outputs data for adjustment. The flocculation effect detection device 21 provides feedback to the information receiving and processing terminal 4 of the flocculant feeding device 2 through the flocculation effect information processing terminal 20. The information receiving and processing terminal 4 controls the opening degree of the flow control valve 5.

[0035] The flow detection device 1 includes a pipeline flow meter 7 and a flow information transmission terminal 6 installed on the pipeline flow meter 7. One end of the pipeline flow meter 7 is connected to the outlet of the bottom mud pump's output pipeline, and the other end of the pipeline flow meter 7 is connected to the electric tubular stirring device 3 through a Venturi structure. The flow information transmission terminal 6 is electrically connected to the flocculant feeding device 2. The pipeline flow meter 7 can collect the flow velocity of the bottom mud in the output pipeline.

[0036] The flocculant feeding device 2 includes a flow control valve 5 and an information receiving and processing terminal 4. The information receiving and processing terminal 4 is electrically connected to the flow detection device 1 and the flocculation effect information terminal 20. The information receiving and processing terminal 4 controls the opening degree of the flow control valve 5.

[0037] The Venturi structure includes a Venturi tube converging section 8, a Venturi tube throat 10, and a Venturi tube expanding section 11 arranged sequentially. The Venturi tube converging section 8 is connected to the flow detection device 1, and the Venturi tube expanding section 11 is connected to the electric tubular stirring device 3. A grid plate 9 is provided at the middle position of the Venturi tube expanding section 11.

[0038] The electric tubular stirring device 3 includes a tubular housing 17, with an end cap 16 and a stirring tube outlet 22 at the tail end of the tubular housing 17. A stirring shaft 12 is rotatably connected inside the tubular housing 17, and a turbine blade 15 is provided on the stirring shaft 12. The end of the stirring shaft 12 extends out of the end cap 16 and is connected to the output end of the motor 13. The stirring shaft 12 and the end cap 16 are rotatably connected. The stirring shaft 12 is rotatably connected to a cross plate 14, and the cross plate 14 is fixedly connected to the inner wall of the tubular housing 17.

[0039] One of the three-way pipe joints 19 is connected to the geotextile bag via a flexible hose or directly into the geotextile bag.

[0040] The flocculation effect testing device 21 includes a detachably connected upper half section 25 and a lower half section 26. Chromatographic filter paper is arranged between the upper half section 25 and the lower half section 26. The chromatographic filter paper can move between the upper half section 25 and the lower half section 26. The upper half section 25 is connected to one of the three-way pipe joints 19. The upper half section 25 has a 3cm diameter feed hole at its center, which is connected to the orifice of the joint. This feed hole is used to allow the sediment to be tested to come into contact with the chromatographic filter paper, so that the sediment enters the capillary in the chromatographic filter paper to complete the test. The lower half section 26 has a detection probe 28 on the side that contacts the chromatographic filter paper. The lower half section 26 has a 3cm discharge hole at its center, which is used to detect the discharge of sediment after the test is completed. The discharge hole and the feed hole are arranged correspondingly.

[0041] The flocculation effect test will generate a certain amount of mixed bottom mud with a non-optimal flocculant dosage for testing. This part of the bottom mud can flow out through the discharge hole provided on the lower half 26 and enter the waste cylinder.

[0042] In this embodiment, the upper section 25 and the lower section 26 can be made of steel plates with a side length of 10cm. An acrylic plate can be embedded in the middle of the lower section 26 for connection with the probe. The upper section 25 and the lower section 26 are connected by four sets of fixing iron plates 24 with bolts. The fixing iron plate 24 is an elliptical iron plate with a thickness of 2mm and a circular hole with a diameter of 4mm at each end. The circular holes at both ends are used to fix the fixing iron plate 24 to the two plates with bolts, so as to realize the closure of the upper section 25 and the lower section 26. It can also be manually disassembled after the test.

[0043] The chromatography filter paper is segmented, with each segment capable of completing one test. Each segment is 25cm long and consists of a waste discharge section 29 and a test section 30. The waste discharge section 29 has a long, narrow cavity in its center, extending along the direction of filter paper movement. The waste discharge section 29 is 10cm long and has an area of ​​100cm. 2 When the elongated cavity moves with the chromatography filter paper to the space between the upper half 25 and the upper opening of the lower half 26, waste material can be discharged. The cavity has a certain length to ensure a certain allowable error during waste discharge. The chromatography filter paper test section 30 is a blank, non-porous chromatography filter paper that meets the requirements for capillary water absorption time measurement; its length is 15 cm and its area is 150 cm². 2 .

[0044] On the lower half 26, two sets of detection probes 28 are arranged sequentially on the outside of the feed inlet according to their distance from the feed inlet. The flocculation effect information terminal 20 is connected to the two sets of detection probes 28. The flocculation effect information terminal 20 is a data acquisition device. The flocculation effect information terminal 20 is used to collect the time t1 and t2 when the two sets of detection probes 28 detect the bottom mud flowing through the chromatography filter paper, and calculate the difference between the two time t1 and t2. The result t = t2 - t1 is the result of this test, and the calculation result is fed back to the flocculant feeding device 2.

[0045] The two sets of detection probes 28 are positioned close to the first section of the filter paper to ensure that the detection probes 28 are not affected by the sediment from the previous test. The inner detection probe is positioned near the edge of the discharge hole in the lower half of the filter paper, and the outer detection probe is 2 cm away from the inner detection probe. When the sediment in the chromatography filter paper passes the inner detection probe 28, a signal is output and the current time t1 is recorded. When the sediment passes the outer detection probe 28, the current time t2 is recorded. The time t = t2 - t1 is taken as the capillary water absorption time, i.e., the test result, to judge the flocculation effect.

[0046] In this embodiment, multiple sections of the chromatography filter paper can be wound and collected on a roller. The roller 23 is a cylindrical tube with a diameter of 10 cm. Two rollers are provided: one for winding clean chromatography filter paper and the other for collecting used chromatography filter paper. The two rollers are respectively positioned at the beginning and end of the chromatography filter paper to ensure stable forward movement of the chromatography filter paper. The drum 23 is equipped with a motor connected to the flocculation effect information terminal 20. When the flocculation effect information terminal 20 calculates the test results and outputs a signal, the test ends. The flocculation effect information terminal 20 outputs a signal to the motor in the drum 23, causing the motor to rotate the drum clockwise by 0.5024 rad (that is, the filter paper advances 12.5 cm). The long strip-shaped hole of the chromatography filter paper waste discharge section 29 is aligned with the discharge hole and stays for 2 minutes to allow the waste to be discharged. After 2 minutes, the motor in the drum continues to rotate clockwise by 0.5024 rad, and the filter paper advances 12.5 cm, so that the chromatography filter paper test section 30 is located between the upper half section 25 and the lower half section 26.

[0047] The method for determining the optimal flocculant dosage based on capillary absorption time (CST) is as follows:

[0048] Step 1: Set a certain concentration of flocculant for the first measurement;

[0049] Step 2: Increase and decrease the flocculant dosage by 10%, and then measure two sets of data again;

[0050] Step 3: If any group in Groups 2 or 3 has a higher CST value than Group 1, then that group will be used as the initial concentration, and the experiment will begin from Step 1. If the CST values ​​in Groups 2 and 3 are both lower than those in Group 1, then the midpoint between the flocculant concentration of the group with the higher CST value and the flocculant concentration of Group 1 will be used for the fourth experiment.

[0051] Step 4: Take the midpoint between the corresponding concentration of the fourth group and the corresponding concentration of the first group, and conduct the fifth group test;

[0052] Step 5: If the CST measured in the fourth group is greater than that in the first group, then the midpoint between the flocculant concentrations of the fourth group and the fifth group is taken as the optimal dosage; if the CST measured in the fourth group is less than that in the first group, then the midpoint between the flocculant concentrations of the first group and the fifth group is taken as the optimal dosage.

[0053] The above method ensures a certain level of accuracy by dividing the selected flocculant concentration range into three steps to determine the optimal flocculant dosage. A flocculant selection method based on CST values ​​is proposed, which continuously fine-tunes the flocculant dosage through logical judgment, thereby improving flocculation efficiency and reducing flocculant usage.

[0054] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the automated flocculant dosing and stirring device for treating river and lake bottom sediments, as described in this invention, and can produce the positive effects described in this invention.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An automated flocculant dosing and mixing device for treating river and lake bottom sediment, characterized in that: The system includes a flow detection device (1), one end of which is connected to the outlet of the bottom sediment pump's output pipe, and the other end of which is connected to an electric tubular agitator (3) via a Venturi structure. A flocculant feeding device (2) is installed on the Venturi structure and is electrically connected to the flow detection device (1). The tail end of the electric tubular agitator (3) is provided with a stirring tube outlet (22), which is connected to a tee pipe joint. (19) Connect the flocculation effect detection device (21) and the geotextile bag. The bottom mud mixed with flocculant is output from the discharge port (22) of the mixing pipe. Part of the bottom mud output through the discharge port (22) of the mixing pipe enters the geotextile bag to complete flocculation, and the other part enters the flocculation effect detection device (21) for detection. The flocculation effect detection device (21) is equipped with a flocculation effect information processing terminal (20), which is electrically connected to the flocculant feeding device (2). The electric tubular stirring device (3) includes a tubular shell (17), an end cap (16) and a stirring tube outlet (22) are provided at the tail end of the tubular shell (17), a stirring shaft (12) is rotatably connected inside the tubular shell (17), a turbine blade (15) is provided on the stirring shaft (12), the end of the stirring shaft (12) extends out of the end cap (16) and is connected to the output end of the motor (13), and the stirring shaft (12) is rotatably connected to the end cap (16); The flow detection device (1) includes a pipeline flow meter (7) and a flow information transmission terminal (6) installed on the pipeline flow meter (7). One end of the pipeline flow meter (7) is connected to the outlet of the bottom mud pump's output pipeline, and the other end of the pipeline flow meter (7) is connected to an electric tubular stirring device (3) through a Venturi structure. The flow information transmission terminal (6) is electrically connected to the flocculant feeding device (2). The pipeline flow meter (7) can collect the flow velocity of the bottom mud in the output pipeline. The flocculant feeding device (2) includes a flow control valve (5) and an information receiving and processing terminal (4). The information receiving and processing terminal (4) is electrically connected to the flow detection device (1) and the flocculation effect information terminal (20). The information receiving and processing terminal (4) controls the opening degree of the flow control valve (5). The flocculation effect detection device (21) includes a detachably connected upper half section (25) and a lower half section (26). Chromatographic filter paper is set between the upper half section (25) and the lower half section (26). The chromatographic filter paper can move between the upper half section (25) and the lower half section (26). The upper half section (25) is connected to one of the three-way pipe joints (19). The upper half section (25) has a feed inlet in the center, which is connected to the orifice of the joint. The lower half section (26) has a detection probe (28) on the side that contacts the chromatographic filter paper. The lower half section (26) has a discharge hole in the center, which is used to detect the discharge of bottom mud after the test is completed. The discharge hole and the feed inlet are set accordingly. The chromatography filter paper is segmented, and each segment of chromatography filter paper can complete one test. Each segment of chromatography filter paper is divided into a waste discharge section (29) and a test section (30). The waste discharge section (29) has a long strip-shaped hole in the center with a length distributed along the moving direction of the chromatography filter paper. The test section (30) is a blank, non-porous chromatography filter paper. On the lower half (26), two sets of detection probes (28) are arranged sequentially on the outside of the feed inlet according to their distance from the feed inlet; the processing flocculation effect information terminal (20) is connected to the two sets of detection probes (28) by signal. The processing flocculation effect information terminal (20) is used to collect the time t1 and t2 when the two sets of detection probes (28) detect the bottom mud flowing through the chromatography filter paper, and to perform experimental calculations and feed back the calculation results to the flocculant feeding device (2); Multiple sections of the chromatography filter paper can be wound and collected on the roller (23). There are two rollers (23), which are respectively connected to the first and last ends of the chromatography filter paper. The rollers (23) can roll and drive the chromatography filter paper to move.

2. The automated flocculant dosing and mixing device for treating river and lake sediments according to claim 1, characterized in that: The Venturi structure includes a Venturi tube converging section (8), a Venturi tube throat (10), and a Venturi tube expanding section (11) arranged in sequence. The Venturi tube converging section (8) is connected to the flow detection device (1), and the Venturi tube expanding section (11) is connected to the electric tubular stirring device (3). A grid plate (9) is provided in the middle of the Venturi tube expanding section (11).

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