Emergency removing method for limnoperna fortunei in closed equipment

Abstract

The invention belongs to the technical field of limnoperna fortunei removal, and particularly relates to an emergency removal method for limnoperna fortunei in closed equipment. Comprising the following steps: S1, counting the internal volume of equipment, calculating the usage amount of sodium chloride, and preparing a sodium chloride solution; s2, throwing a sodium chloride solution into an inlet or an access hole of the equipment, sampling at a water outlet and a sewage outlet to detect the concentration of sodium chloride, and keeping the concentration of sodium chloride stable; s3, closing the equipment for 24 hours, opening a water outlet valve, and washing with a high-pressure water gun; s4, collecting and disposing limnoperna formosana residues after flushing is completed. The cleaning difficulty of the limnoperna fortunei is improved, the limnoperna fortunei is rapidly cleaned in cooperation with high-pressure water jet, meanwhile, damage to the equipment structure in the violent process of a scraper and the like is avoided, and compared with other chemicals, the cleaning agent is safe, nontoxic and small in harm to the environment; according to the device, attachment of the limnoperna fortunei can be effectively removed, meanwhile, the limnoperna fortunei at the corner position in the device can be deeply removed, and meanwhile operation is easy.

Description

Technical Field

[0001] The invention belongs to the technical field of freshwater shellfish removal, and particularly relates to an emergency removal method for freshwater shellfish in a closed device. Background Art

[0002] Freshwater mussels belong to the family Mytilidae of the class Bivalvia, and their scientific name is the swamp clam. They have a thin, hard, triangular shell and can grow and attach in large quantities to the surfaces of underwater structures such as metal gates of water conservancy projects, soft water pipes, and the bottoms of ships, causing adverse consequences such as substrate corrosion, water pollution, and pipe aging and blockage. Their growth is affected by external conditions such as temperature, light, and salinity. Currently, freshwater mussels have become a major fouling organism of concern both domestically and internationally. Their prevention and removal methods mainly include physical means (manual or mechanical cleaning, closed hypoxia, dehydration and drying, high-temperature flushing, paint protection, ultraviolet or ultrasonic killing, etc.), chemical means (dissolution of byssus threads, killing with chemicals), and biological means (releasing specific fish).

[0003] The prevention, control and removal methods for freshwater shellfish are currently mostly focused on physical and chemical means. There are existing inventions that use the principle of ultrasound to prevent and control freshwater shellfish, but such methods are relatively expensive, cause great damage to water conservancy project structures, and are greatly limited in terms of usage distance, space, and the killing effect on adult shellfish. In addition, the method of applying paint is used to prevent the attachment of freshwater shellfish, but most paints cannot be widely promoted and applied due to their performance and pollution to water bodies. Compared with the above physical means, chemical means are the fastest to take effect and have a more obvious effect. The existing patent with invention publication number CN103523899A discloses a method for removing freshwater shellfish by combining sodium hypochlorite with hydraulic flushing. However, due to the oxidizing property of sodium hypochlorite, excessive addition will have adverse effects on aquatic organisms such as fish, so this method is difficult to use in large-scale water conservancy projects. There is also a patent with publication number CN104222050A that uses chlorine to prevent and control freshwater shellfish in raw soft water pipes. The patent with application number CN201110108909.5 uses potassium permanganate to kill raw water. The patent application number CN201310504693.3 discloses a method for killing freshwater shellfish in long-distance raw water softening pipelines by using hydrogen peroxide, and the patent application number CN201310504913.2 discloses a method for killing freshwater shellfish in long-distance raw water softening pipelines by using the combined action of chlorine dioxide and sodium hypochlorite. The residual chemical reagents in the above methods can produce toxic byproducts, which not only affect the safety of water quality, but also have an impact on the equipment itself and other aquatic organisms.

[0004] In summary, the byssus of freshwater shellweed has strong adhesion, and traditional physical methods need to be carried out regularly, which is labor-intensive and costly; the chemical method mainly kills freshwater shellweed by adding oxidants to the water, but it may have an impact on the aquatic ecosystem; and biological means are difficult to control and take a certain amount of time to be effective; at the same time, due to the strong adhesion and easy residue of freshwater shellweed, it is difficult to remove it cleanly in some closed equipment such as curved tanks, especially the inner corners of the tank equipment; and usually when cleaning, in order to ensure that it is clean, repeated and complicated cleaning is required, and even staff need to enter the equipment, which is cumbersome. Summary of the Invention

[0005] In order to address the deficiencies in the prior art, the present invention provides an emergency removal method for freshwater shellfish in a closed device. The present invention increases the difficulty of cleaning freshwater shellfish, and cooperates with a high-pressure water jet to achieve rapid removal of freshwater shellfish, while avoiding damage to the equipment structure by violent processes such as scrapers. Compared with other traditional chemical agents, the present invention is safe and non-toxic, and has less harm to the environment. The present invention can effectively remove the attachment of freshwater shellfish through flushing with a high-pressure water gun, and can also deeply remove the freshwater shellfish in the corners inside the equipment. The present invention can quickly remove the freshwater shellfish on the inner wall of the equipment in all directions without dead angles through the cooperation of the first L-shaped bracket, the second L-shaped bracket and the first automatic telescopic mechanism and the second automatic telescopic mechanism. At the same time, the operation is simple, and only the first L-shaped bracket needs to be rotated.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

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

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

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

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

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

[0012] Furthermore, high-pressure water gun flushing includes the following steps:

[0013] S31, pressing the first L-shaped bracket and the second L-shaped bracket together laterally, inserting them into the top of the device and loosening them, so that the first L-shaped bracket and the second L-shaped bracket are hung on the top of the device;

[0014] S32, start the electric telescopic rod to extend, so that the grinding frame is separated from the limit plate and abuts against the inner wall of the equipment, then 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 flushing.

[0015] Furthermore, the first L-shaped bracket includes a transverse rod and a longitudinal rod fixedly connected to each other, the longitudinal rod is provided with a first through hole, the first L-shaped bracket is fixedly mounted with an electric telescopic rod, the telescopic end of the electric telescopic rod passes through the first through hole and a mounting plate is fixedly mounted on the end thereof;

[0016] A second through hole is formed inside the second L-shaped bracket, and a soft water pipe is movably passed through the second through hole; a limiting plate is fixedly provided 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 through a first automatic telescopic mechanism, and a 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, both 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 the C-shaped hinge groove; a water pipe joint is fixedly provided on the grinding frame, and the water pipe joint is fixedly connected to one end of the soft water pipe; the outer side of the grinding frame is hinged to the C-shaped hinge groove through a rotating shaft; a second return spring is mounted on the second telescopic rod; and grinding teeth are provided on the grinding frame and on the side 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 on one end of the transverse rod.

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

[0023] Furthermore, 2 hours after the sodium chloride solution is poured into the equipment inlet or maintenance port, the sodium chloride concentration in the water is sampled and tested.

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

[0025] (1) The method for quickly removing freshwater husks in a sealed device proposed by the present invention is based on two aspects: first, the principle that sodium chloride can reduce the adhesion of freshwater husks' byssus threads, thereby reducing the difficulty of removing freshwater husks; second, the sodium chloride solution is utilized to penetrate and destroy the cell structure of freshwater husks, thereby directly killing freshwater husks. Through these two aspects, the difficulty of cleaning freshwater husks is increased, and the high-pressure water jet is used to achieve the rapid removal of freshwater husks, while avoiding the damage to the equipment structure caused by violent processes such as scrapers; at the same time, the method for removing freshwater husks is simple to operate and has obvious effects. It only requires adding sodium chloride to the equipment, and the sealed effect for a certain period of time can reduce the adhesion of the byssus threads of freshwater husks and cause their death. Sodium chloride is a common chemical agent with high domestic production and low price. It has high feasibility and is safe and non-toxic compared with other traditional chemical agents, and has little harm to the environment.

[0026] (2) The present invention can effectively remove the attachment of freshwater shellfish by flushing with a high-pressure water gun, and can also deeply remove the freshwater shellfish in the corners inside the device; specifically, when the first L-shaped bracket and the second L-shaped bracket are pressed and folded laterally, and then inserted into the top of the device and released, under the action of the first automatic telescopic mechanism and the second automatic telescopic mechanism, the first L-shaped bracket and the second L-shaped bracket are both limited to abut against the top inner wall of the device, and the electric telescopic rod is started to extend, and the grinding frame is separated from the limit plate. Since there is no limit on the limit plate, the second automatic telescopic mechanism The structure is extended, so that one end of the soft water pipe abuts against the inner wall of the equipment to achieve flushing; because one end of the second automatic telescopic mechanism is hinged to one end of the soft water pipe, the one end of the soft water pipe is always close to parallel with the inner wall of the equipment, so that the water sprayed from the soft water pipe can act nearly vertically on the attachment point of the freshwater shellfish and 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, no matter which position the electric telescopic rod is extended or retracted, one end of the soft water pipe will always abut against the inner wall of the equipment, so that the freshwater shellfish in the corners inside the equipment can be deeply removed.

[0027] (3) The present invention can not only quickly remove freshwater shellfish on the inner wall of the equipment in all directions without dead angles through the cooperation of the first L-shaped bracket, the second L-shaped bracket and the first automatic telescopic mechanism and the second automatic telescopic mechanism, but also is simple to operate, and only needs to rotate the first L-shaped bracket; specifically, when the grinding frame is separated from the limit plate, the grinding frame abuts against the inner wall of the equipment under the action of the second automatic telescopic mechanism, and since the outer side of the grinding frame is hinged to the C-shaped hinge groove 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, the first L-shaped bracket is rotated, due to The action of the first return spring of the first automatic telescopic mechanism will ensure that the first L-shaped bracket and the second L-shaped bracket are always at the farthest position relative to the inner wall of the top of the equipment; therefore, when the first L-shaped bracket rotates, the second L-shaped bracket can also follow the deflection, thereby ensuring that the soft water pipe spray point and the grinding teeth of the grinding frame change synchronously in annular direction, thereby ensuring vertical spraying while quickly changing position, and at the same time, the grinding teeth follow the friction inner wall to avoid residue; finally, under the synchronous extension action of the electric telescopic rod, the freshwater shell vegetables on the inner wall of the closed equipment can be quickly removed in all directions without dead ends, and the operation is simple, and only the first L-shaped bracket needs to be rotated. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a flow chart of a method for emergency removal of freshwater shellfish in a closed device according to the present invention;

[0029] Figure 2 This is an experimental data diagram of an emergency removal method for freshwater shellfish in a closed device according to the present invention;

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

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

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

[0033] Figure 6 A schematic diagram of a cross-sectional structure of a high-pressure water gun flushing method for emergency removal of freshwater shellfish in a closed device according to the present invention;

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

[0035] Figure 8The present invention is a schematic diagram of the local structure of a high-pressure water gun flushing method for emergency removal of freshwater shellfish in a closed device.

[0036] The reference numerals are as follows:

[0037] 100. First L-shaped bracket; 110. Transverse rod; 120. Longitudinal rod; 121. First through hole; 200. Electric telescopic rod; 210. Mounting plate; 300. Second L-shaped bracket; 310. Limiting plate; 400. Water pipe; 410. Grinding frame; 411. Grinding teeth; 420. Water pipe joint; 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 slot; 631. Rotating shaft. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0039] Although the steps in the present invention are arranged with numbers, they are not intended to limit the order of the steps. Unless the order of the steps is clearly 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" 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 device includes the following steps:

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

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

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

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

[0046] The present invention provides a method for rapidly removing freshwater husks in a sealed device. The method is based on two principles: first, sodium chloride is used to reduce the adhesion of freshwater husk byssus threads, thereby reducing the difficulty of removing the husks; and second, sodium chloride solution is used to penetrate and destroy the cell structure of freshwater husks, thereby directly killing the husks. These two aspects increase the difficulty of removing the husks, and high-pressure water jets are used to rapidly remove the husks while avoiding damage to the device structure caused by violent processes such as scrapers. Furthermore, the method is simple to operate and has significant effects. Only sodium chloride needs to be added to the device, and the sealed device can reduce the adhesion of the husk byssus threads for a certain period of time, thereby killing the husks. Furthermore, sodium chloride is a common chemical agent with high domestic production and low price, and is highly feasible. Compared with other traditional chemical agents, it is safe and non-toxic, and poses little environmental risk.

[0047] Furthermore, high-pressure water gun flushing includes the following steps:

[0048] S31, press the first L-shaped bracket 100 and the second L-shaped bracket 300 together horizontally, then insert them into the top of the device and loosen them so that the first L-shaped bracket 100 and the second L-shaped bracket 300 are hung on the top of the device;

[0049] S32, start the electric telescopic rod 200 to extend, so that the grinding frame 410 is separated from the limit 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 flushing.

[0050] The present invention can effectively remove the attachment of freshwater shellfish through high-pressure water gun flushing, and can also deeply remove the freshwater shellfish in the corners inside the equipment; a detailed description will be given 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 supply, which 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 formed on the longitudinal rod 120. An electric telescopic rod 200 is fixedly mounted 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 fixed to the end thereof.

[0053] A second through hole is formed inside the second L-shaped bracket 300 , and a soft water pipe 400 is movably passed through the second through hole. A limiting plate 310 is fixedly provided 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 through a first automatic telescopic mechanism 500, and a second automatic telescopic mechanism 600 is fixedly connected to 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 the present invention, when the first L-shaped bracket 100 and the second L-shaped bracket 300 are pressed and folded horizontally, and then inserted into the top interior of the device and released, under the action of the first automatic telescopic mechanism 500 and the second automatic telescopic mechanism 600, the first L-shaped bracket 100 and the second L-shaped bracket 300 are both limited and abutted against the top inner wall of the device. At this time, the electric telescopic rod 200 is started to extend, and the grinding frame 410 is separated from the limit plate 310. Since there is no limit of the limit plate 310, the second automatic telescopic mechanism 600 extends, so that one end of the soft water pipe 400 abuts against the inner wall of the device. Flushing is achieved; since one end of the second automatic telescopic mechanism 600 is hinged to one end of the soft water pipe 400, one end of the soft water pipe 400 is always close to being parallel to the inner wall of the device, so that the water sprayed from the soft water pipe can act nearly vertically on the attachment point between the freshwater shellfish and the inner wall of the device, 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 which position the electric telescopic rod 200 is telescoped to, one end of the soft water pipe 400 will always abut the inner wall of the device, thereby deeply removing the freshwater shellfish in the corners inside the device.

[0056] Furthermore, the first automatic telescopic mechanism 500 includes a first telescopic rod 510 , both 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 structures of the first automatic telescopic mechanism 500 and the second automatic telescopic mechanism 600 are similar. The first telescopic rod 510 can be freely telescopic and retracted. Under the control of the first return spring 520, the telescopic control of the first telescopic rod 510 is realized, which is not 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 joint 420 is fixedly provided on the grinding frame 410, and the water pipe joint 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 a grinding tooth 411 is provided on the grinding frame 410 and on the side away from the C-shaped hinge groove 630.

[0059] The present invention cooperates with the first L-shaped bracket 100, the second L-shaped bracket 300 and the first automatic telescopic mechanism 500 and the second automatic telescopic mechanism 600, which can not only quickly remove freshwater shellfish on the inner wall of the device in all directions without dead angles, but also has simple operation, and only requires rotating the first L-shaped bracket 100; specifically, when the grinding frame 410 is separated from the limit plate 310, the grinding frame 410 is abutted against the inner wall of the device under the action of the second automatic telescopic mechanism 600, because 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 are always abutted 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 10 0. Due to the action of the first return spring 520 of the first automatic telescopic mechanism 500, it is ensured that the first L-shaped bracket 100 and the second L-shaped bracket 300 are always at the farthest position relative to 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 follow the deflection, thereby ensuring that the spraying point of the soft water pipe 400 and the grinding teeth 411 of the grinding frame 410 change in an axial direction synchronously, thereby quickly changing the position while ensuring vertical spraying, and at the same time, the grinding teeth 411 follow the friction inner wall to avoid residue; finally, under the synchronous extension action of the electric telescopic rod 200, the freshwater shell vegetables on the inner wall of the closed equipment are quickly removed in all directions without dead angles, and the operation is simple, and only the first L-shaped bracket 100 needs to be rotated.

[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 device.

[0061] Furthermore, the depth of the C-shaped hinge groove 630 is greater than the length of the grinding frame 410. This structural design facilitates the free flipping of the grinding frame 410 without being hindered.

[0062] Furthermore, a rotating handle is fixedly provided at one end of the transverse rod 110. The rotating handle can be used to conveniently control the rotation of the first L-shaped bracket 100.

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

[0064] Furthermore, 2 hours after the sodium chloride solution is poured into the equipment inlet or maintenance port, the sodium chloride concentration in the water is sampled and tested.

[0065] The technical feasibility of the present invention is verified by experiments:

[0066] Freshwater mollusks that had long been attached to the surface of natural bedrock in the wild were collected and cultured in an incubator using circulating water. The natural substrate was also placed in the incubator to avoid damaging the mollusks' byssus threads. After 3 days of acclimatization, sodium chloride solutions of varying concentrations were added, and a control blank group was set up. After 24 hours, no mollusks died in the groups with sodium chloride concentrations of 1g / L and 3g / L, a small amount of mollusks died due to shell opening in the 5g / L group, and the mortality rate of mollusks in the 7g / L and 10g / L groups exceeded 70%. After 48 hours of the experiment, no mollusks died in the 1g / L and 3g / L groups, the mortality rate of mollusks in the 5g / L group was approximately 70%, and the mortality rate of mollusks in the 7g / L and 10g / L groups was almost 100%. At the same time, it was found that the adhesion of freshwater shellfish in the 7g / L and 10g / L test groups was significantly reduced (P<0.05). At 24h, the adhesion had decreased by about 40%. Figure 2 shown.

[0067] Example 2

[0068] like Figure 3 As shown, first, based on the volume of the water filter and the theoretical concentration of sodium chloride in the water filter, 7 to 10 g / L; calculate the specific amount of sodium chloride used by the solution dilution formula c1*V1=c2*V2, and configure it for use. Then close the water filter outlet valve and water inlet valve, and add sodium chloride solution to the water filter from the water filter inspection port 1 at one time. 2 hours after the addition, samples are taken at the water outlet and sewage outlet to test the sodium chloride concentration in the water. After maintaining a stable and uniform concentration of sodium chloride, the inlet and outlet valves are opened after a sealed sterilization for 24 hours to enter the normal filtration working mode. As the water body flows, the freshwater shellfish falls off and enters the sewage filtration working mode, and the freshwater shellfish shell is discharged through the sewage pipe.

[0069] After field tests, the embodiment of the sodium chloride removal of freshwater kelp in the water filter of the present invention was tested in a large power station in my country. When the raw water temperature was 20-26°C, the concentration of sodium chloride added to the water filter was 10g / L. After 24 hours of sealed killing, the mortality rate of freshwater kelp reached more than 80%, and the adhesion of the byssus of freshwater kelp was significantly reduced. When the water filter was rinsed with a high-pressure water gun, 95% of the freshwater kelp could be effectively removed. When the raw water temperature was 20-26°C, the concentration of sodium chloride added to the water filter was 7g / L. After 24 hours of sealed killing, the mortality rate of freshwater kelp reached more than 75%.

[0070] After tests with different concentration gradients, the actual concentration of sodium chloride proposed by the present invention is 7-10 g / L. According to the actual treatment efficiency, the sealing time can be appropriately extended to 36 hours or 48 hours. This method avoids the phenomenon of shell protection of freshwater shellfish when killed by other chemical reagents such as potassium permanganate and sodium hypochlorite, effectively shortens the action time, reduces economic costs, and does not produce disinfection by-products. The chemical action on the byssus of freshwater shellfish and the organism in the sealed device is carried out. After the action, the sodium chloride solution in the sealed device is rinsed and diluted with a large amount of natural water, and will not affect the water quality of natural water bodies.

[0071] This technical solution is used for the emergency removal and disposal of freshwater weeds in enclosed environments such as water filters. The killing of freshwater weeds can be completed by simply determining the amount of sodium chloride added based on the volume parameters of the equipment being used. No major equipment modifications are required, and the solution has the advantages of small engineering workload, low investment, simple operation, and environmental friendliness. It can meet the needs of emergency treatment of freshwater weeds in enclosed equipment such as hydropower plants, pumped storage power stations, and water pipelines.

[0072] Example 3

[0073] like Figure 4 As shown, the fire water tank is an important structure in water fire fighting design. It is an artificially built water storage facility for supplying water to fire pumps. The interior is a reinforced concrete structure, which is suitable for the growth of freshwater shellfish. A large amount of freshwater shellfish is often attached to the surface.

[0074] The implementation process is as follows: when the fire water tank is out of use, close the inlet and outlet valves, add sodium chloride solution, drain the water after 24 hours, use a high-pressure water gun to flush the freshwater shellfish on the wall surface, and then clean the freshwater shellfish from the bottom of the fire water tank to prevent it from further attachment in the fire water tank.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several improvements and changes can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. An emergency removal method for freshwater shellfish in a closed device, characterized in that: The steps include: S1. Count the internal volume of the equipment, calculate the amount of sodium chloride used, and prepare the sodium chloride solution; S2. Pour sodium chloride solution into the equipment inlet or maintenance port, and take samples at the water outlet and sewage outlet to test the sodium chloride concentration and keep the sodium chloride concentration stable; S3. After the equipment is sealed for 24 hours, open the water outlet valve and flush it with a high-pressure water gun; S4. After rinsing, collect and dispose of the freshwater shellfish residues.

2. The emergency removal method of freshwater shellfish in a closed device according to claim 1, characterized in that: High-pressure water gun flushing includes the following steps: S31, pressing the first L-shaped bracket (100) and the second L-shaped bracket (300) together laterally, inserting them into the top of the device and loosening them, so that the first L-shaped bracket (100) and the second L-shaped bracket (300) are hung on the top of the device; S32, the electric telescopic rod (200) is activated to extend, so that the grinding frame (410) is separated from the limiting plate (310) and abuts against the inner wall of the device. At this time, the high-pressure water gun connected to the soft water pipe (400) is activated, and the first L-shaped bracket (100) is rotated along the top of the device to achieve flushing.

3. The emergency removal method of freshwater shellfish in a closed device according to claim 2, characterized in that: The first L-shaped bracket (100) comprises a transverse rod (110) and a longitudinal rod (120) fixedly connected to each other, a first through hole (121) being formed through the longitudinal rod (120), an electric telescopic rod (200) being fixedly mounted on the first L-shaped bracket (100), a telescopic end of the electric telescopic rod (200) passing through the first through hole (121) and a mounting plate (210) being fixedly mounted on the end thereof; A second through hole is provided inside the second L-shaped bracket (300), and a soft water pipe (400) is movably provided through the second through hole; a limiting plate (310) is fixedly provided on the outer side of the bottom end of the second L-shaped bracket (300).

4. The emergency removal method of freshwater shellfish in a closed device according to claim 3, characterized in that: The upper ends of the first L-shaped bracket (100) and the second L-shaped bracket (300) are fixedly connected via a first automatic telescopic mechanism (500); a second automatic telescopic mechanism (600) is fixedly connected to the mounting plate (210); one end of the second automatic telescopic mechanism (600) is hinged to one end of the soft water pipe (400).

5. The emergency removal method of freshwater shellfish in a closed device according to claim 4, characterized in that: The first automatic telescopic mechanism (500) comprises a first telescopic rod (510), the two ends of the first telescopic rod (510) being 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) being sleeved on the first telescopic rod (510).

6. The emergency removal method of freshwater shellfish in a closed device according to claim 4, characterized in that: The second automatic telescopic mechanism (600) comprises a second telescopic rod (610), one end of which is fixedly connected to the mounting plate (210), and the other end of which is fixedly connected to the C-shaped hinge groove (630); a water pipe joint (420) is fixedly provided on the grinding frame (410), and the water pipe joint (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) via a rotating shaft (631); a second return spring (620) is sleeved on the second telescopic rod (610); and a grinding tooth (411) is provided on the side of the grinding frame (410) away from the C-shaped hinge groove (630).

7. The method for emergency removal of freshwater shellfish in a closed device according to claim 6, characterized in that: The depth of the C-shaped hinge groove (630) is greater than the length of the grinding frame (410).

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

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

10. The method for emergency removal of freshwater shellfish in a closed device according to claim 1, characterized in that: After adding sodium chloride solution to the equipment inlet or maintenance port, take samples to test the sodium chloride concentration in the water 2 hours later.

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