Emergency method for removing freshwater zebra mussels from a closed facility

Abstract

This invention belongs to the field of freshwater shellfish removal technology, specifically relating to an emergency removal method for freshwater shellfish in a sealed device. The method includes the following steps: S1, calculating the internal volume of the device and the amount of sodium chloride needed, and preparing the sodium chloride solution; S2, adding the sodium chloride solution to the device inlet or inspection port, and taking samples at the outlet and drain to test the sodium chloride concentration, maintaining a stable concentration; S3, after the device has been sealed for 24 hours, opening the outlet valve and rinsing with a high-pressure water gun; S4, collecting and disposing of the remaining freshwater shellfish after rinsing. This invention improves the difficulty of cleaning freshwater shellfish, achieving rapid removal with high-pressure water jets, while avoiding damage to the device structure caused by forceful processes such as scraping. Compared with other agents, it is safe and non-toxic, with minimal environmental impact. This invention can effectively remove the adhered freshwater shellfish and deeply remove it from the corners and edges inside the device, while also being simple to operate.

Description

Technical Field

[0001] This invention belongs to the field of freshwater shellfish removal technology, specifically relating to an emergency removal method for freshwater shellfish in a closed system. Background Technology

[0002] Freshwater mussels, belonging to the family Myopodaceae in the class Bivalvia, scientifically known as *Myriophyllum sp.*, have thin, hard, triangular shells. They proliferate and attach to the surfaces of underwater structures such as metal sluice gates, soft water pipelines, and ship hulls in water conservancy projects, causing adverse consequences such as substrate corrosion, water pollution, and pipe aging and blockage. Their growth is affected by external environmental factors such as temperature, light, and salinity. Currently, freshwater mussels have become a significant source of pollution both domestically and internationally. Control and removal methods mainly include physical means (manual or mechanical cleaning, anaerobic enclosure, dehydration and drying, high-temperature rinsing, protective coatings, ultraviolet or ultrasonic sterilization, etc.), chemical means (byssal dissolution, chemical agent killing), and biological means (introducing specific fish species).

[0003] Current methods for controlling and removing freshwater shellfish primarily focus on physical and chemical approaches. While some inventions utilize ultrasonic principles for control, these methods are costly, cause significant damage to hydraulic structures, and are severely limited in their application distance, spatial scope, and effectiveness against adult shellfish. Additionally, coatings can be used to prevent shellfish adhesion, but most coatings are not widely adopted due to their performance characteristics and water pollution potential. Compared to these physical methods, chemical methods are the fastest and most effective. A patent with publication number CN103523899A discloses a method for removing freshwater shellfish using sodium hypochlorite combined with hydraulic flushing. However, due to the oxidizing properties of sodium hypochlorite, excessive addition can adversely affect aquatic organisms such as fish, making this method unsuitable for large-scale water conservancy projects. Another patent, publication number CN104222050A, uses chlorine to control freshwater shellfish in existing soft water pipelines. A patent with application number CN201110108909.5 utilizes potassium permanganate to kill the raw water. Methods for eliminating freshwater clams in soft water pipelines, patent application number CN201310504693.3's method of killing freshwater clams in long-distance raw water soft water pipelines using hydrogen peroxide, and patent application number CN201310504913.2's method of killing freshwater clams in long-distance raw water soft water pipelines using the combined action of chlorine dioxide and sodium hypochlorite—all these methods leave chemical residues that can produce toxic byproducts. This not only affects the safety of the water quality but also impacts the equipment itself and other aquatic organisms.

[0004] In summary, the byssal threads of freshwater shellfish have strong adhesion, and traditional physical methods require regular application, which is labor-intensive and costly. Chemical methods mainly kill the shellfish by adding oxidants to the water, but this may impact the aquatic ecosystem. Biological methods are difficult to control and require a certain amount of time to be effective. Furthermore, due to the strong adhesion and tendency of freshwater shellfish to remain, they are difficult to remove completely from enclosed equipment such as curved tanks, especially in the corners and edges of the tank walls. Moreover, cleaning usually requires repeated and complicated cleaning to ensure thorough removal, and sometimes workers even need to enter the equipment, making the operation cumbersome. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an emergency removal method for freshwater shellfish in enclosed equipment. This invention increases the difficulty of cleaning freshwater shellfish by using high-pressure water jets to achieve rapid removal, while avoiding damage to the equipment structure caused by forceful processes such as scraping. Compared with other traditional chemical agents, it is safe and non-toxic, with minimal environmental impact. This invention effectively removes the adhering freshwater shellfish through high-pressure water jet rinsing, and can also deeply remove freshwater shellfish from the corners and edges inside the equipment. Through the cooperation of the first L-shaped bracket, the second L-shaped bracket, the first automatic telescopic mechanism, and the second automatic telescopic mechanism, this invention can quickly and completely remove freshwater shellfish from the inner wall of the equipment, and is simple to operate, requiring only the rotation of the first L-shaped bracket.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An emergency removal method for freshwater shellfish in a sealed device includes the following steps:

[0008] S1. Calculate the internal volume of the equipment, calculate the amount of sodium chloride used, and prepare the sodium chloride solution.

[0009] S2. Add sodium chloride solution to the equipment inlet or maintenance port, and take samples at the outlet and sewage outlet to test the sodium chloride concentration, and keep the sodium chloride concentration stable.

[0010] S3. After the equipment has been sealed for 24 hours, open the outlet valve and flush it with a high-pressure water gun.

[0011] S4. After rinsing, collect and dispose of the freshwater shellfish residue.

[0012] Furthermore, high-pressure water jet rinsing includes the following steps:

[0013] S31. Press the first L-shaped bracket and the second L-shaped bracket horizontally and close them together, then insert them into the top of the equipment and release them so that the first L-shaped bracket and the second L-shaped bracket hang on the top of the equipment.

[0014] S32. Start the electric telescopic rod to extend, so that the grinding frame is disengaged from the limit plate and abuts against the inner wall of the equipment. At this time, start the high-pressure water gun connected to the soft water pipe and rotate the first L-shaped bracket along the top of the equipment to achieve rinsing.

[0015] Furthermore, the first L-shaped bracket includes a transverse rod and a longitudinal rod that are fixedly connected to each other. A first through hole is provided through the longitudinal rod. An electric telescopic rod is fixedly installed on the first L-shaped bracket. The telescopic end of the electric telescopic rod passes through the first through hole and is fixedly provided with a mounting plate at its end.

[0016] The second L-shaped bracket has a second through hole inside, through which a soft water pipe is movably inserted; a limiting plate is fixedly installed on the outer side of the bottom end of the second L-shaped bracket.

[0017] Furthermore, the upper ends of the first L-shaped bracket and the second L-shaped bracket are fixedly connected by the first automatic telescopic mechanism, and the second automatic telescopic mechanism is fixedly connected to the mounting plate; one end of the second automatic telescopic mechanism is hinged to one end of the soft water pipe.

[0018] Furthermore, the first automatic telescopic mechanism includes a first telescopic rod, the two ends of which are fixedly connected to the upper ends of the first L-shaped bracket and the second L-shaped bracket, and a first return spring is sleeved on the first telescopic rod.

[0019] Furthermore, the second automatic telescopic mechanism includes a second telescopic rod, one end of which is fixedly connected to the mounting plate, and the other end is fixedly connected to a C-shaped hinge groove; a water pipe connector is fixedly provided on the grinding frame, and the water pipe connector is fixedly connected to one end of a soft water pipe; the outer side of the grinding frame is hinged to the C-shaped hinge groove via a rotating shaft; a second return spring is sleeved on the second telescopic rod; and grinding teeth are provided on the side of the grinding frame away from the C-shaped hinge groove.

[0020] Furthermore, the depth of the C-shaped hinge groove is greater than the length of the grinding frame.

[0021] Furthermore, a rotating handle is fixedly provided at one end of the transverse rod.

[0022] Furthermore, the water temperature in the sealed equipment is 20–26°C; the concentration of the sodium chloride solution is 7–10 g / L.

[0023] Furthermore, after adding sodium chloride solution to the equipment inlet or maintenance port, a sample is taken 2 hours later to test the sodium chloride concentration in the water.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The rapid removal method for freshwater shellfish in a sealed environment proposed in this invention is based on two principles: first, sodium chloride reduces the adhesion of the byssal threads of the freshwater shellfish, thus lowering the difficulty of removal; second, sodium chloride solution directly kills the freshwater shellfish by penetrating and destroying its cell structure. These two mechanisms increase the difficulty of cleaning the freshwater shellfish, and combined with high-pressure water jetting, achieve rapid removal while avoiding damage to the equipment structure caused by forceful processes such as scraping. Furthermore, the removal method is simple to operate and highly effective; simply adding sodium chloride to the equipment and sealing it for a certain period reduces the adhesion of the byssal threads, leading to the death of the freshwater shellfish. Sodium chloride is a common chemical agent with high domestic production and low price, making it highly feasible. Compared with other traditional chemical agents, it is safe, non-toxic, and has minimal environmental impact.

[0026] (2) This invention effectively removes freshwater shellfish by using a high-pressure water gun to clean, and also deeply removes freshwater shellfish from the corners and edges inside the equipment. Specifically, when the first L-shaped bracket and the second L-shaped bracket are pressed and retracted laterally, then inserted into the top of the equipment and released, under the action of the first and second automatic telescopic mechanisms, both the first L-shaped bracket and the second L-shaped bracket are limited to abutting against the top inner wall of the equipment. At this time, the electric telescopic rod is activated to extend, causing the grinding frame to disengage from the limiting plate. Since there is no longer a limiting plate, the second automatic telescopic mechanism... The extension mechanism allows one end of the soft water hose to contact the inner wall of the equipment for rinsing. Because one end of the second automatic telescopic mechanism is hinged to one end of the soft water hose, the hose remains nearly parallel to the inner wall of the equipment. This allows the water sprayed from the hose to act almost vertically on the attachment points of the freshwater shellfish to the inner wall of the equipment, effectively and quickly removing the shellfish. Simultaneously, due to the second automatic telescopic mechanism, regardless of the position of the electric telescopic rod, one end of the soft water hose will always contact the inner wall of the equipment, thus deeply removing freshwater shellfish from the corners and edges inside the equipment.

[0027] (3) This invention, through the cooperation of the first L-shaped bracket, the second L-shaped bracket, the first automatic telescopic mechanism, and the second automatic telescopic mechanism, can not only remove freshwater shellfish from the inner wall of the equipment quickly and without dead angles, but also is simple to operate, requiring only the rotation of the first L-shaped bracket; specifically, when the grinding frame disengages from the limiting plate, the grinding frame abuts against the inner wall of the equipment under the action of the second automatic telescopic mechanism. Since the outer side of the grinding frame is hinged to the C-shaped hinge slot through the rotating shaft, it can ensure that the grinding teeth of the grinding frame always abut against the inner wall of the device, thereby ensuring the vertical spraying of the soft water pipe; at this time, rotating the first L-shaped bracket, due to The first return spring of the first automatic telescopic mechanism ensures that the first L-shaped bracket and the second L-shaped bracket are always at the furthest point relative to each other on the inner wall of the top of the equipment. Therefore, when the first L-shaped bracket rotates, the second L-shaped bracket can also deflect accordingly, thereby ensuring that the soft water pipe spray point and the grinding teeth of the grinding frame change synchronously in the circumferential direction. This ensures that the position can be changed quickly while maintaining vertical spraying. At the same time, the grinding teeth follow and rub against the inner wall to avoid residue. Finally, under the synchronous extension of the electric telescopic rod, the freshwater shellfish on the inner wall of the sealed equipment can be removed quickly and completely without dead angles. The operation is simple, requiring only the rotation of the first L-shaped bracket. Attached Figure Description

[0028] Figure 1 This is a flowchart of an emergency removal method for freshwater shellfish in a sealed device according to the present invention;

[0029] Figure 2 This is an experimental data graph illustrating an emergency removal method for freshwater shellfish in a sealed device according to the present invention.

[0030] Figure 3 This is a schematic diagram illustrating an application scenario of the emergency removal method for freshwater shellfish in a sealed device according to the present invention. Figure 1 ;

[0031] Figure 4 This is a schematic diagram illustrating an application scenario of the emergency removal method for freshwater shellfish in a sealed device according to the present invention. Figure 2 ;

[0032] Figure 5 This is a schematic diagram of a high-pressure water gun flushing structure for an emergency removal method of freshwater shellfish in a sealed device according to the present invention.

[0033] Figure 6 This is a schematic diagram of the high-pressure water jet flushing cross-section structure of an emergency removal method for freshwater shellfish in a sealed device according to the present invention.

[0034] Figure 7 This is a schematic diagram of a high-pressure water gun flushing and dispersing structure for an emergency removal method of freshwater shellfish in a closed device according to the present invention.

[0035] Figure 8This is a partial structural diagram of a high-pressure water gun flushing method for an emergency removal method of freshwater shellfish in a sealed device according to the present invention.

[0036] The attached figures are labeled as follows:

[0037] 100. First L-shaped bracket; 110. Horizontal rod; 120. Longitudinal rod; 121. First through hole; 200. Electric telescopic rod; 210. Mounting plate; 300. Second L-shaped bracket; 310. Limiting plate; 400. Soft water pipe; 410. Grinding frame; 411. Grinding teeth; 420. Water pipe connector; 500. First automatic telescopic mechanism; 510. First telescopic rod; 520. First return spring; 600. Second automatic telescopic mechanism; 610. Second telescopic rod; 620. Second return spring; 630. C-shaped hinge groove; 631. Rotating shaft. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0040] Example 1

[0041] like Figures 1 to 8 As shown, an emergency removal method for freshwater shellfish in a closed system includes the following steps:

[0042] S1. Calculate the internal volume of the equipment, calculate the amount of sodium chloride used, and prepare the sodium chloride solution.

[0043] S2. Add sodium chloride solution to the equipment inlet or maintenance port, and take samples at the outlet and sewage outlet to test the sodium chloride concentration, and keep the sodium chloride concentration stable.

[0044] S3. After the equipment has been sealed for 24 hours, open the outlet valve and flush it with a high-pressure water gun.

[0045] S4. After rinsing, collect and dispose of the freshwater shellfish residue.

[0046] This invention proposes a rapid removal method for freshwater shellfish in a sealed environment. The removal principle is based on two aspects: first, sodium chloride reduces the adhesion of the byssal threads of the shellfish, thus lowering the difficulty of removal; second, sodium chloride solution directly kills the shellfish through penetration and cell structure disruption. These two mechanisms increase the difficulty of removing the shellfish, and combined with high-pressure water jetting, achieve rapid removal while avoiding damage to the equipment structure caused by forceful processes such as scraping. Furthermore, the removal method is simple to operate and highly effective; simply adding sodium chloride to the sealed environment for a certain period reduces the adhesion of the byssal threads, leading to the death of the shellfish. Sodium chloride is a common chemical agent with high domestic production and low price, making it highly feasible. Compared with other traditional chemical agents, it is safe, non-toxic, and has less environmental impact.

[0047] Furthermore, high-pressure water jet rinsing includes the following steps:

[0048] S31. Press the first L-shaped bracket 100 and the second L-shaped bracket 300 horizontally together, then insert them into the top of the device and release them, so that the first L-shaped bracket 100 and the second L-shaped bracket 300 hang on the top of the device.

[0049] S32. Start the electric telescopic rod 200 to extend, so that the grinding frame 410 is disengaged from the limiting plate 310 and abuts against the inner wall of the equipment. At this time, start the high-pressure water gun connected to the soft water pipe 400 and rotate the first L-shaped bracket 100 along the top of the equipment to achieve rinsing.

[0050] This invention uses a high-pressure water gun to effectively remove the attachment of freshwater shellfish, and can also deeply remove freshwater shellfish from the corners and edges inside the equipment; this will be described in detail later.

[0051] It is worth noting that the electric telescopic rod 200 and the high-pressure water gun of the present invention are both powered and controlled by an external power source, and will not be described in detail here.

[0052] Furthermore, the first L-shaped bracket 100 includes a transverse rod 110 and a longitudinal rod 120 that are fixedly connected to each other. A first through hole 121 is provided through the longitudinal rod 120. An electric telescopic rod 200 is fixedly installed on the first L-shaped bracket 100. The telescopic end of the electric telescopic rod 200 passes through the first through hole 121 and a mounting plate 210 is fixedly provided at the end.

[0053] The second L-shaped bracket 300 has a second through hole inside, through which a soft water pipe 400 is movably inserted; a limiting plate 310 is fixedly installed on the outer side of the bottom end of the second L-shaped bracket 300.

[0054] Furthermore, the upper ends of the first L-shaped bracket 100 and the second L-shaped bracket 300 are fixedly connected by the first automatic telescopic mechanism 500, and the second automatic telescopic mechanism 600 is fixedly connected on the mounting plate 210; one end of the second automatic telescopic mechanism 600 is hinged to one end of the soft water pipe 400.

[0055] In this invention, when the first L-shaped bracket 100 and the second L-shaped bracket 300 are pressed and retracted laterally, then inserted into the top of the equipment and released, under the action of the first automatic telescopic mechanism 500 and the second automatic telescopic mechanism 600, both the first L-shaped bracket 100 and the second L-shaped bracket 300 are limited to abutting against the inner wall of the top of the equipment. At this time, the electric telescopic rod 200 is activated to extend, causing the grinding frame 410 to disengage from the limiting plate 310. Since the limiting plate 310 is no longer in place, the second automatic telescopic mechanism 600 extends, causing one end of the soft water pipe 400 to abut against the inner wall of the equipment. The process achieves rinsing; because one end of the second automatic telescopic mechanism 600 is hinged to one end of the soft water pipe 400, the soft water pipe 400 is always close to being parallel to the inner wall of the equipment, so that the water sprayed from the soft water pipe can act almost vertically on the attachment point of the freshwater shellfish to the inner wall of the equipment, thereby effectively and quickly removing the attachment of the freshwater shellfish; at the same time, due to the action of the second automatic telescopic mechanism 600, no matter where the electric telescopic rod 200 is extended or retracted, one end of the soft water pipe 400 will always be in contact with the inner wall of the equipment, thereby deeply removing the freshwater shellfish in the corners and edges of the equipment.

[0056] Furthermore, the first automatic telescopic mechanism 500 includes a first telescopic rod 510, the two ends of which are fixedly connected to the upper ends of the first L-shaped bracket 100 and the second L-shaped bracket 300, and a first return spring 520 is sleeved on the first telescopic rod 510.

[0057] It is worth noting that the first automatic telescopic mechanism 500 and the second automatic telescopic mechanism 600 have similar structures. The first telescopic rod 510 can extend and retract freely. Under the control of the first return spring 520, the extension and retraction control of the first telescopic rod 510 is realized. This will not be described in detail here.

[0058] Furthermore, the second automatic telescopic mechanism 600 includes a second telescopic rod 610, one end of which is fixedly connected to the mounting plate 210, and the other end is fixedly connected to the C-shaped hinge groove 630; a water pipe connector 420 is fixedly provided on the grinding frame 410, and the water pipe connector 420 is fixedly connected to one end of the soft water pipe 400; the outer side of the grinding frame 410 is hinged to the C-shaped hinge groove 630 through a rotating shaft 631; a second return spring 620 is sleeved on the second telescopic rod 610; and grinding teeth 411 are provided on the side of the grinding frame 410 away from the C-shaped hinge groove 630.

[0059] This invention, through the cooperation of the first L-shaped bracket 100, the second L-shaped bracket 300, the first automatic telescopic mechanism 500, and the second automatic telescopic mechanism 600, can not only remove freshwater shellfish from the inner wall of the equipment quickly and without blind spots from all directions, but also is simple to operate, requiring only the rotation of the first L-shaped bracket 100. Specifically, when the grinding frame 410 disengages from the limiting plate 310, the grinding frame 410 abuts against the inner wall of the equipment under the action of the second automatic telescopic mechanism 600. Since the outer side of the grinding frame 410 is hinged to the C-shaped hinge groove 630 through the rotating shaft 631, it can ensure that the grinding teeth 411 of the grinding frame 410 always abut against the inner wall of the device, thereby ensuring the vertical spraying of the soft water pipe 400. At this time, rotating the first L-shaped bracket 100... 0. Due to the action of the first return spring 520 of the first automatic telescopic mechanism 500, the first L-shaped bracket 100 and the second L-shaped bracket 300 are always at the furthest point relative to each other on the inner wall of the top of the equipment. Therefore, when the first L-shaped bracket 100 rotates, the second L-shaped bracket 300 can also deflect accordingly, thereby ensuring that the spray point of the soft water pipe 400 and the grinding teeth 411 of the grinding frame 410 change synchronously in the circumferential direction. This ensures that the position is changed quickly while maintaining vertical spraying. At the same time, the grinding teeth 411 follow the friction of the inner wall to avoid residue. Finally, under the synchronous extension of the electric telescopic rod 200, the freshwater shellfish on the inner wall of the closed equipment can be removed quickly and without dead angles. The operation is simple, requiring only the rotation of the first L-shaped bracket 100.

[0060] It is worth noting that the grinding teeth 411 can be made of soft materials such as rubber to prevent scratching the inner wall of the equipment.

[0061] Furthermore, the depth of the C-shaped hinge groove 630 is greater than the length of the grinding frame 410. This structural design allows the grinding frame 410 to rotate freely without obstruction.

[0062] Furthermore, a rotating handle is fixedly provided at one end of the transverse rod 110. The first L-shaped bracket 100 can be easily rotated by rotating the handle.

[0063] Furthermore, the water temperature in the sealed equipment is 20–26°C; the concentration of the sodium chloride solution is 7–10 g / L.

[0064] Furthermore, after adding sodium chloride solution to the equipment inlet or maintenance port, a sample is taken 2 hours later to test the sodium chloride concentration in the water.

[0065] Experimental verification of the technical feasibility of this invention:

[0066] Freshwater shellfish that had been attached to natural substrate surfaces in the wild for extended periods were collected and cultured in an incubator using a circulating water system. The natural substrate was placed in the incubator along with the shellfish to avoid damaging their byssal threads. After acclimatization for 3 days, sodium chloride solutions of different concentrations were added, with a control group included. After 24 hours, no mortality was observed in the 1 g / L and 3 g / L sodium chloride groups. A small number of shellfish died in the 5 g / L group, and the mortality rate exceeded 70% in the 7 g / L and 10 g / L groups. After 48 hours, no mortality was observed in the 1 g / L and 3 g / L groups, the mortality rate was approximately 70% in the 5 g / L group, and almost 100% in the 7 g / L and 10 g / L groups. Meanwhile, it was also found that the adhesion of freshwater shellfish in the 7 g / L and 10 g / L experimental groups decreased significantly (P < 0.05), and the adhesion had decreased by about 40% after 24 h. Figure 2 As shown.

[0067] Example 2

[0068] like Figure 3 As shown, firstly, based on the filter volume and the theoretical sodium chloride concentration inside the filter (7-10 g / L), calculate the specific amount of sodium chloride needed using the solution dilution formula c1*V1=c2*V2, and prepare it for use. Then, close the filter's outlet and inlet valves, and add the sodium chloride solution into the filter through the filter's inspection port 1 in one go. Two hours after addition, take samples at both the outlet and drain to test the sodium chloride concentration in the water. After maintaining a stable and uniform sodium chloride concentration, seal the filter for 24 hours for sterilization, then open the inlet and outlet valves to enter the normal filtration mode. As the water flows, the freshwater husks detach and enter the wastewater filtration mode, with the husks being discharged through the drain pipe.

[0069] Through field testing, in an embodiment of the sodium chloride method for removing freshwater shellfish from a water filter according to the present invention, a field test was conducted at a large power plant in my country. When the raw water temperature was 20-26℃, adding sodium chloride at a concentration of 10g / L to the water filter and sealing it for 24 hours resulted in a mortality rate of over 80% for the freshwater shellfish. The adhesion of the byssal threads of the freshwater shellfish was significantly reduced. When the water filter was rinsed with a high-pressure water gun, 95% of the freshwater shellfish could be effectively removed. When the raw water temperature was 20-26℃, adding sodium chloride at a concentration of 7g / L to the water filter and sealing it for 24 hours resulted in a mortality rate of over 75% for the freshwater shellfish.

[0070] After experiments with different concentration gradients, the actual sodium chloride concentration proposed in this invention is 7-10 g / L. Depending on the actual treatment efficiency, the sealing time can be appropriately extended to 36 or 48 hours. This method avoids the shell-closing protection phenomenon that occurs with other chemical reagents such as potassium permanganate and sodium hypochlorite when used for sterilization of freshwater shellfish. It effectively reduces the action time and economic costs, and produces no disinfection byproducts. The chemical action on the byssal threads and organisms of the freshwater shellfish within the sealed equipment, followed by rinsing and dilution with a large amount of natural water, does not affect the water quality of the natural water body.

[0071] This technical solution is used for the emergency removal and treatment of freshwater mussels in enclosed environments such as water filters. The elimination of freshwater mussels can be achieved simply by determining the sodium chloride dosage based on the volume parameters of the equipment. It requires no major modifications to the equipment and has advantages such as small engineering scope, low investment, simple operation, and environmental friendliness. It can meet the emergency treatment needs of freshwater mussels in enclosed facilities such as hydropower plants, pumped storage power stations, and water pipelines.

[0072] Example 3

[0073] like Figure 4 As shown, fire water tanks, as important structures in water fire protection design, are artificially constructed water storage facilities for fire pumps. The interior is made of reinforced concrete and is suitable for the growth of freshwater shellfish, with a large number of freshwater shellfish often attached to the surface.

[0074] The implementation process is as follows: When the fire water tank is not in use, close the inlet and outlet valves, add sodium chloride solution, let it act for 24 hours, drain the water, use a high-pressure water gun to rinse the freshwater clams on the wall surface, and then clean the freshwater clams from the bottom of the fire water tank to prevent them from adhering further in the fire water tank.

[0075] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An emergency removal method for freshwater shellfish in a sealed device, characterized in that, Includes the following steps: S1. Calculate the internal volume of the equipment, calculate the amount of sodium chloride used, and prepare the sodium chloride solution. S2. Add sodium chloride solution to the equipment inlet or maintenance port, and take samples at the outlet and sewage outlet to test the sodium chloride concentration, and keep the sodium chloride concentration stable. S3. After the equipment has been sealed for 24 hours, open the outlet valve and flush it with a high-pressure water gun. S4. After rinsing, collect and dispose of the freshwater shellfish residue. High-pressure water jet rinsing includes the following steps: S31. Press the first L-shaped bracket (100) and the second L-shaped bracket (300) horizontally together, then insert them into the top of the device and release them so that the first L-shaped bracket (100) and the second L-shaped bracket (300) hang on the top of the device. S32. Start the electric telescopic rod (200) to extend, so that the grinding frame (410) is separated from the limiting plate (310) and abuts against the inner wall of the equipment. At this time, start the high-pressure water gun connected to the soft water pipe (400) and rotate the first L-shaped bracket (100) along the top of the equipment to achieve rinsing. The first L-shaped bracket (100) includes a horizontal rod (110) and a vertical rod (120) that are fixedly connected to each other. A first through hole (121) is provided through the vertical rod (120). An electric telescopic rod (200) is fixedly installed on the first L-shaped bracket (100). The telescopic end of the electric telescopic rod (200) passes through the first through hole (121) and a mounting plate (210) is fixedly provided at the end. The second L-shaped bracket (300) has a second through hole inside, and a soft water pipe (400) is movably inserted through the second through hole; a limiting plate (310) is fixedly installed on the outer side of the bottom end of the second L-shaped bracket (300); The upper ends of the first L-shaped bracket (100) and the second L-shaped bracket (300) are fixedly connected by the first automatic telescopic mechanism (500), and the second automatic telescopic mechanism (600) is fixedly connected on the mounting plate (210); one end of the second automatic telescopic mechanism (600) is hinged to one end of the soft water pipe (400); The first automatic telescopic mechanism (500) includes a first telescopic rod (510), the two ends of the first telescopic rod (510) are fixedly connected to the upper ends of the first L-shaped bracket (100) and the second L-shaped bracket (300), and a first return spring (520) is sleeved on the first telescopic rod (510). The second automatic telescopic mechanism (600) includes a second telescopic rod (610), one end of which is fixedly connected to the mounting plate (210), and the other end is fixedly connected to a C-shaped hinge groove (630); a water pipe connector (420) is fixedly provided on the grinding frame (410), and the water pipe connector (420) is fixedly connected to one end of the soft water pipe (400); the outer side of the grinding frame (410) is hinged to the C-shaped hinge groove (630) through a rotating shaft (631); a second return spring (620) is sleeved on the second telescopic rod (610); and grinding teeth (411) are provided on the side of the grinding frame (410) away from the C-shaped hinge groove (630).

2. The emergency removal method for freshwater shellfish in a sealed device according to claim 1, characterized in that, The depth of the C-shaped hinge groove (630) is greater than the length of the grinding frame (410).

3. The emergency removal method for freshwater shellfish in a sealed device according to claim 1, characterized in that, A rotating handle is fixedly provided at one end of the transverse rod (110).

4. The emergency removal method for freshwater shellfish in a sealed device according to claim 1, characterized in that, The water temperature in the closed equipment is 20~26℃; the concentration of the sodium chloride solution is 7~10g / L.

5. The emergency removal method for freshwater shellfish in a sealed device according to claim 1, characterized in that, Two hours after the sodium chloride solution is added to the equipment inlet or maintenance port, a sample is taken to test the sodium chloride concentration in the water.

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