A sterilization system using microwave electromagnetic waves in aquaculture

Abstract

The utility model provides a kind of for aquaculture utilize microwave electromagnetic wave's sterilization system, belong to aquaculture technical field, including filter mechanism, its filter sundries in aquaculture pond;Pre-oxidation pond, it is communicated with the filter mechanism, for oxidizing water quality;Microwave mechanism, it is communicated with the pre-oxidation pond, the microwave mechanism has array setting microwave emission source in, for carrying out sterilization to water;To be cooled pond, it is communicated with the microwave mechanism, for cooling oxygenation to water;And standby pond, it is communicated with the to be cooled pond, and the standby pond is communicated with the aquaculture pond, the standby pond is used to carry out temperature adjustment treatment to water.By filtering-pre-oxidation-microwave sterilization-cooling oxygenation to pond water in main body aquaculture pond, the replacement of pond water and sterilization are realized, microwave sterilization can penetrate relatively turbid water body, kill escherichia coli, vibrio, aeromonas etc. in aquaculture pond water, and sterilization efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of aquaculture technology, and specifically relates to a sterilization system using microwave electromagnetic waves for aquaculture. Background Technology

[0002] The sustainable development of large-scale aquaculture is highly dependent on the health of the aquatic environment, and pathogen control is a core technological challenge in achieving high-density aquaculture. In closed or recirculating aquaculture systems, the limited water flow and the proliferation of feed residues, biological metabolites, and microorganisms can easily lead to eutrophication, providing a breeding ground for pathogens (such as Escherichia coli, Vibrio, and Aeromonas) and viruses.

[0003] Traditional aquaculture mainly relies on chemical disinfectants and ultraviolet (UV) disinfection to maintain water hygiene. Chemical disinfection (chlorine-based agents) works by destroying microbial cell membranes and enzyme systems through strong oxidation, significantly inactivating bacteria and viruses. However, existing chemical and UV disinfection methods directly disinfect in the pond. With chemical disinfectants, chlorine reacts with organic matter in the water (such as humic acid and fish excrement) in a halogenation reaction, producing typical drug byproducts such as trihalomethanes (THMs) and haloacetic acids (HAAs). These byproducts not only threaten the safety of farmed organisms but also disrupt the natural aquatic ecosystem after discharge. With UV disinfection, ultraviolet light is significantly attenuated in turbid water, and suspended particles (such as feed residue, algae, and feces) create a shielding effect. UV light only takes effect momentarily and has no inhibitory effect on light-blind areas (pipe bends, pond wall biofilms) or newly flowing water. Therefore, both chemical and UV disinfection methods suffer from low sterilization efficiency and cannot achieve water circulation during in-pond disinfection. Utility Model Content

[0004] Based on this, the present invention provides a sterilization system using microwave electromagnetic waves for aquaculture, in order to solve the technical problems existing in the prior art, such as low sterilization efficiency of both chemical disinfectant sterilization and ultraviolet disinfection methods, and the inability to achieve water circulation in the water tank.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A sterilization system utilizing microwave electromagnetic waves for aquaculture, comprising: Filtration system, which filters out debris in aquaculture ponds; A pre-oxidation tank, which is connected to the filtration mechanism, is used to oxidize water quality; A microwave mechanism, which is connected to the pre-oxidation tank, has an array of microwave emitting sources inside the microwave mechanism for sterilizing the water; A cooling tank, connected to the microwave mechanism, is used for cooling and oxygenating the water; and A backup water tank is connected to the cooling tank and to the aquaculture tank. The backup water tank is used for temperature control of the water.

[0006] Preferably, the filtration mechanism includes a primary filter, a secondary filter, and a sedimentation tank. The primary filter is connected to the aquaculture pond, the secondary filter is connected to the primary filter, and the sedimentation tank is connected to the secondary filter.

[0007] Preferably, the pre-oxidation tank is equipped with a stirrer for stirring the water in the pre-oxidation tank.

[0008] Preferably, a flow-slowing mechanism is provided at one end of the microwave mechanism, which is used to slow down the flow rate of water.

[0009] Preferably, the microwave mechanism includes a microwave housing, which is connected to the slow-flow mechanism. Several microwave emission sources are arranged on both sides of the inner cavity of the microwave housing, a microwave diffuser is arranged on the top of the microwave housing, and an eddy current generator is arranged on the bottom of the microwave housing.

[0010] Preferably, an ammonia nitrogen degradation chamber is provided at the other end of the microwave mechanism, and the ammonia nitrogen degradation chamber contains an activated carbon-zeolite composite adsorption layer.

[0011] Preferably, the activated carbon and zeolite in the activated carbon-zeolite composite adsorption layer are arranged alternately.

[0012] Preferably, a water curtain slow-flow box is provided at the other end of the ammonia nitrogen degradation box. The water curtain slow-flow box is located on one side of the cooling pool. Several rows of slow-flow outlets are provided at the bottom of the water curtain slow-flow box. The slow-flow outlets are narrow.

[0013] Preferably, an underground cooling pool is provided below the water curtain slow-flow box, and the underground cooling pool is connected to the pool to be cooled, and the underground cooling pool is used to cool the water.

[0014] Preferably, the backup water tank is equipped with a sampling device for extracting water samples from the backup water tank.

[0015] Compared with the prior art, the present invention has at least the following advantages: By filtering, pre-oxidizing, microwave sterilizing, cooling, and oxygenating the water in the main aquaculture ponds, the system achieves water replacement and sterilization. 1. Microwave sterilization can penetrate relatively turbid water and kill E. coli, Vibrio, Aeromonas, and other bacteria in the aquaculture pond water with high sterilization efficiency; 2. Sterilization is achieved at low temperatures using the non-thermal effect of microwaves, eliminating the need to heat the water to a high temperature; 3. By using a method of exporting water from different aquaculture ponds, sterilization can be performed on water from different ponds, achieving water circulation; 4. The microwave sterilization method results in extremely low levels of drug byproducts, which will not affect water quality and ensure the safety of aquaculture organisms. Attached Figure Description

[0016] Figure 1 A flowchart for sterilization process in aquaculture.

[0017] Figure 2 This is a schematic diagram of a microwave mechanism.

[0018] Figure 3 This is a schematic diagram of a microwave mechanism.

[0019] Figure 4 This is a schematic diagram of an ammonia nitrogen degradation chamber.

[0020] The diagram shows: aquaculture pond 100, filtration mechanism 200, primary filter screen 210, secondary filter screen 220, sedimentation pond 230, pre-oxidation pond 300, stirrer 310, slow-flow mechanism 400, microwave mechanism 500, microwave shell 510, microwave emission source 520, microwave diffuser 530, eddy current generator 540, ammonia nitrogen degradation box 600, activated carbon-zeolite composite adsorption layer 610, cooling pond 700, water curtain slow-flow box 710, underground cooling pond 720, backup water pond 800, and sampling device 810. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0022] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0023] Please refer to Figures 1 to 4 A sterilization system utilizing microwave electromagnetic waves for aquaculture, comprising: The filtration mechanism 200 filters out debris from the aquaculture pond 100. In a large-scale aquaculture base, there are fish ponds, shrimp ponds, crab ponds, etc., with each type of pond separated. Grass carp and common carp are raised in the fish ponds. The suitable temperature for the fish ponds is 24-28℃, for the shrimp ponds it is 28-32℃, and for the crab ponds it is 20-25℃. The water in each pond is filtered by the filtration mechanism 200. The aquaculture inlet gate is opened to allow dead leaves and floating debris to flow out of the pond, and a water pump is used to remove feces and debris from the bottom of the pond. The filtered water is called primary water.

[0024] The pre-oxidation tank 300 is connected to the filtration mechanism 200 and is used to oxidize the water. The water filtered by the filtration mechanism 200 enters the pre-oxidation tank 300 to perform pre-oxidation treatment on the water in the pre-oxidation tank 300. The pre-oxidation treatment involves adding an oxidant to the water to prepare for improving the efficiency of microwave sterilization.

[0025] The microwave mechanism 500 is connected to the pre-oxidation tank 300. The microwave mechanism 500 has an array of microwave emission sources 520 for sterilizing the water. The sterilization of the water is carried out by microwaves. Since the water in the tank is at a low temperature, the temperature rise is limited. Therefore, the sterilization is mainly carried out by the non-thermal effect of microwaves. The non-thermal effect specifically refers to the direct interference of the microwave electric field with the bacterial cell membrane potential and DNA / RNA structure, resulting in changes in cell permeability and metabolic disorders. The primary function is to kill Vibrio, Escherichia coli, and Aeromonas in water. While E. coli is heat-sensitive, the non-thermal effect of microwaves, rather than their thermal effect, significantly reduces its activity even at low temperatures. Vibrio and Aeromonas are moderately heat-sensitive, and under prolonged microwave interference at low temperatures, most of them can be killed. Furthermore, since the dihydrate has undergone pre-oxidation treatment, the microwaves catalyze the generation of reactive oxygen species, enhancing sterilization efficiency. Finally, after killing Vibrio, E. coli, and Aeromonas in the primary water, a tertiary water is formed at a temperature of 30°C-45°C.

[0026] The cooling tank 700 is connected to the microwave mechanism 500 and is used to cool and oxygenate the water. Although the water undergoes non-thermal microwave sterilization, the water temperature is still heated to 30°-45° by the microwave mechanism 500. That is, the temperature of the three waters is 30°-45°, which is higher than the temperature of the water in the main aquaculture tank 100. Therefore, it is necessary to cool the three waters to a temperature similar to that of the water in the main aquaculture tank 100, so that water can be added to the main aquaculture tank 100. At the same time, the three waters are aerated to increase the oxygen content of the water.

[0027] A backup water tank 800 is connected to the cooling tank 700 and also to the aquaculture tank 100. The backup water tank 800 is used for water temperature regulation. Since the main aquaculture tank 100 includes fish ponds, shrimp ponds, crab ponds, etc., and the water temperatures of different ponds vary, even if the water temperature of the cooling tank 700 is similar to that of the main aquaculture tank 100, there is still a small temperature difference, such as 3-8℃. Therefore, it is necessary to pump the return water from the cooling tank 700 to the backup water tank 800, which is connected to the main aquaculture tank 100, for temperature regulation, such as heat exchange. The temperature of the regulated return water is very close to the water temperature in the main aquaculture tank 100, which is beneficial to the survival of various aquatic organisms.

[0028] By filtering, pre-oxidizing, microwave sterilizing, cooling, and oxygenating the water in the main aquaculture pond (100 cubic meters), the water is replaced and sterilized. Microwave sterilization can penetrate relatively turbid water and kill E. coli, Vibrio, Aeromonas, and other bacteria in the aquaculture pond water with high sterilization efficiency. Moreover, it utilizes the non-thermal effect of microwaves for sterilization, achieving low-temperature sterilization without heating the water to a high temperature. At the same time, by exporting water from different aquaculture ponds, the water in different ponds can be sterilized, realizing water circulation. Furthermore, the content of drug by-products generated by microwave sterilization is extremely small, which will not affect water quality and ensure the safety of aquaculture organisms.

[0029] In one possible embodiment, the filtration mechanism 200 includes a primary filter 210, a secondary filter 220, and a sedimentation tank 230. The primary filter 210 is connected to the aquaculture pond 100, the secondary filter 220 is connected to the primary filter 210, and the sedimentation tank 230 is connected to the secondary filter 220. The primary filter 210 has a pore size of 1-2 cm, which is relatively large and mainly filters debris such as dead leaves, branches, and aquatic plants. The secondary filter has a pore size of 0.1-0.2 cm, which is also relatively large and mainly filters fish, shrimp, and crab excrement. Sedimentation filtration is carried out in the sedimentation tank 230 for 15-30 minutes. The sedimentation tank 230 mainly deposits fine excrement and clay. After sedimentation in the sedimentation tank 230, the upper layer of water is water, and the lower layer is mud. By filtering the water, firstly, impurities in the water can be reduced, preventing blockage of the microwave mechanism 500; secondly, reducing impurities in the water lowers its turbidity, which is beneficial for subsequent microwave sterilization. Simultaneously, the filtered dead leaves, manure, etc., can be collected and used as fertilizer for farmland and orchards.

[0030] In one possible embodiment, the pre-oxidation tank 300 treatment includes diverting primary water into the pre-oxidation tank 300 and adding H2O2 or ozone; wherein: the amount of H2O2 added is 40-80 g / ton of water, or the amount of ozone added is 3-6 g / ton of water; and forming secondary water. The mechanism of action of H2O2 is as follows: H2O2 decomposes under microwave radiation: H2O2 generates 2·OH ions under microwave catalysis. The oxidation potential of ·OH ions is as high as 2.8V, which can non-selectively degrade organic matter and destroy microbial cell membranes; at the same time, ozone decomposes under the action of microwaves and catalysts, and O3 + H2O generates ·OH + O2 under the action of microwaves and catalysts. ·OH ions also degrade organic matter and destroy microbial cell membranes. Therefore, by pre-oxidizing the primary water, it is beneficial to improve the microwave sterilization efficiency. Meanwhile, a stirrer 310 is provided in the pre-oxidation tank 300. The stirrer 310 is used to stir the water and oxidant in the pre-oxidation tank 300 so that the two are evenly mixed, thereby further improving the microwave sterilization efficiency.

[0031] Specifically, if the sedimentation tank 230 is located higher than the pre-oxidation tank 300, water can be diverted into the pre-oxidation tank 300. If the sedimentation tank 230 is located lower than or level with the pre-oxidation tank 300, water can be pumped into the pre-oxidation tank 300 using a centrifugal pump.

[0032] It should be noted that, since the pool water adopts a circulation mode, excessive amounts of H2O2 or ozone, such as H2O2 > 100g / ton of water or ozone > 8g / ton of water, can lead to toxicity risks to fish. Therefore, H2O2 or ozone is added in a quantitative manner, with an interval of 10-15 days.

[0033] Specifically, H2O2 and ozone are added in a synergistic manner, with the molar ratio of H2O2 to O3 being 0.5:1 to 1.5:1. For example, 6g of H2O2 and 4g of O3 are added per ton of water. This synergistic addition method can increase the yield of ·OH ions by 30%-50%, reduce the residue of single reagents, and avoid byproducts such as bromate.

[0034] In one possible embodiment, if the water flow rate is too fast, the microwave sterilization mechanism cannot penetrate the water level, resulting in reduced sterilization efficiency. A flow-slowing mechanism 400 is provided at one end of the microwave mechanism 500. The flow-slowing mechanism 400 is used to slow down the water flow rate, limiting the flow speed of the two waters. The two waters enter the microwave mechanism 500 in a slow-flow state, allowing the microwave emission source 520 to penetrate the water level and improve sterilization efficiency.

[0035] Specifically, the flow-slowing section includes a buffer tank, a converging pipe, and a long pipe. Two types of water are pumped into the buffer tank by a water pump. The outlet of the buffer tank is connected to the converging pipe, which is connected to the long pipe. The long pipe is connected to the microwave mechanism 500. The water entering the buffer tank buffers the flow and absorbs pump pulses. Water flows out of the tank and into the converging pipe, gradually reducing the cross-sectional area of ​​the flow and stabilizing the flow velocity distribution. Water from the converging pipe flows into the long pipe, which is typically 20-30 meters long and horizontally positioned. This sufficiently long straight-flow pipe eliminates disturbances to the water flow at the inlet.

[0036] Specifically, the long tube contains a number of perforated plates. These perforated plates function to divide the large eddy current into smaller microflows, achieving a gradual flow transition.

[0037] Specifically, a valve is installed on the long pipe.

[0038] In one possible embodiment, the microwave mechanism 500 includes a microwave housing 510, which is connected to the flow-retarding mechanism 400. One end of the microwave housing 510 has an inlet, and the other end has an outlet. Water flowing from the buffer mechanism enters the microwave resonant cavity inside the microwave housing 510 at a flow rate of 5-10 L / min through the inlet. A plurality of microwave emission sources 520 are arranged on both sides of the inner cavity of the microwave housing 510, with 8-12 sets of microwave emission sources 520. The microwave transmitter 520 emits a frequency band of 2450MHz±50MHz. Water enters the microwave resonant cavity in a slow flow state. Due to the slow water flow, the microwave transmitter 520 penetrates the water level and kills Vibrio, Escherichia coli, and Aeromonas bacteria in the water through the non-thermal effect of microwaves. Specifically, the microwave transmitter 520 is distributed on both sides of the microwave resonant cavity, and the microwave transmitter 520 on both sides emits microwaves alternately. The microwaves continuously and alternately penetrate the water level, improving the sterilization efficiency. Furthermore, a microwave diffuser 530 is installed at the top of the microwave resonant cavity. A conical microwave diffuser is used to optimize the distribution of the microwave field and achieve uniform radiation of electromagnetic wave energy in the water. The microwave diffuser 530 is an existing device, such as the Madel DCN series conical diffuser. A vortex generator 540 is installed at the bottom of the microwave housing 510. By inducing a spiral flow, the residence time of the water in the microwave field is extended, while enhancing the cavitation effect and synergistically destroying the bacterial cell wall. The vortex generator 540 is an existing device, such as the triangular plow vortex generator. The microwave diffuser 530 and the vortex generator 540 are arranged in synergy to form a spiral flow in the water, thereby extending the residence time of microorganisms in the microwave field and further improving the sterilization efficiency.

[0039] Specifically, when the microwave housing 510 is full of water, the valve on the long pipe is closed to stop the water supply, the microwave transmitter 520 is started, the microwave transmitter 520 emits microwave electromagnetic waves to continuously impact the water body for 3-5 minutes, the microwave transmitter 520 is turned off, the water is released from the microwave resonant cavity, and water is collected into the microwave resonant cavity again for impact sterilization until all the filtered water is sterilized.

[0040] In one possible embodiment, an ammonia nitrogen degradation chamber 600 is provided at the other end of the microwave mechanism 500, and the ammonia nitrogen degradation chamber 600 contains an activated carbon-zeolite composite adsorption layer 610. Through activated carbon-zeolite composite adsorption, the ammonia nitrogen content in the water is reduced to below 0.02 mg / L, thereby improving water quality and ultimately forming a three-water system.

[0041] In a preferred embodiment, the activated carbon and zeolite in the activated carbon-zeolite composite adsorption layer 610 are arranged alternately. This alternating adsorption of activated carbon and zeolite effectively degrades and adsorbs ammonia nitrogen in the water, thus improving degradation and adsorption efficiency.

[0042] In one possible embodiment, a water curtain slow-flow chamber 710 is provided at the other end of the ammonia nitrogen degradation tank 600. The water curtain slow-flow chamber 710 is located on one side of the cooling pool 700. Several rows of slow-flow outlets are provided at the bottom of the water curtain slow-flow chamber, and the slow-flow outlets are narrow. Water enters the water curtain slow-flow chamber and flows out from the slow-flow outlets to form a water curtain. The water curtain can increase the contact area between water and air, improve heat dissipation efficiency, and the water falling from the water curtain will enter the underground cooling pool 720 below.

[0043] Specifically, the water flowing out of the ammonia nitrogen degradation tank 600 is pumped into the water curtain slow-flow tank 710 by a water pump.

[0044] In one possible embodiment, an underground cooling pool 720 is provided below the water curtain slow-flow box 710. The underground cooling pool 720 is connected to the pool to be cooled 700 and is used to cool the water. Since the temperature of the three waters is 30°-45°, the water increases the contact surface between the water and the air by passing under the water curtain, achieving rapid cooling of the water. At the same time, the water enters the underground cooling pool 720, which is located 3 meters below the ground. The underground cooling pool 720 has a lower underground temperature, which can achieve rapid heat conduction to the water and reduce its temperature. After the water temperature is reduced, the water is pumped from the underground cooling pool 720 to the pool to be cooled 700, which is located above ground. Aeration and oxygenation are carried out in the pool to create water quality that is more conducive to the survival of aquatic products.

[0045] In one possible embodiment, water is pumped from the cooling tank 700 to the standby tank 800. Heat exchange treatment is required for the water in the standby tank 800. For example, if the water temperature in the cooling tank 700 is 25-27°C, and water is to be supplied to a fish pond (where the suitable temperature is 24-28°C), no temperature adjustment is needed. If water is to be supplied to a shrimp pond (where the suitable temperature is 28-32°C), the water needs to be heated through heat exchange pipes to bring its temperature closer to 28-32°C. If water is to be supplied to a crab pond (where the suitable temperature is 20-25°C), the water needs to be cooled through heat exchange pipes to bring its temperature closer to 20-25°C.

[0046] Furthermore, a sampling device 810 is installed in the backup water tank 800 to extract water samples from the backup water tank 800. This is to obtain the inactivation rate of various bacteria. The detection of Vibrio, Escherichia coli, and Aeromonas can be achieved using existing detection devices.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sterilization system utilizing microwave electromagnetic waves for aquaculture, characterized in that, include Filtration system, which filters out debris in aquaculture ponds; A pre-oxidation tank, which is connected to the filtration mechanism, is used to oxidize water quality; A microwave mechanism, which is connected to the pre-oxidation tank, has an array of microwave emitting sources inside the microwave mechanism for sterilizing the water; A cooling tank, connected to the microwave mechanism, is used for cooling and oxygenating the water; and A backup water tank is connected to the cooling tank and to the aquaculture tank. The backup water tank is used for temperature control of the water.

2. The sterilization system using microwave electromagnetic waves in aquaculture as described in claim 1, characterized in that, The filtration mechanism includes a primary screen, a secondary filter, and a sedimentation tank. The primary screen is connected to the aquaculture pond, the secondary filter is connected to the primary screen, and the sedimentation tank is connected to the secondary filter.

3. The sterilization system using microwave electromagnetic waves in aquaculture as described in claim 1, characterized in that, The pre-oxidation tank is equipped with a stirrer, which is used to stir the water in the pre-oxidation tank.

4. The sterilization system using microwave electromagnetic waves in aquaculture as described in claim 1, characterized in that, One end of the microwave mechanism is equipped with a flow-slowing mechanism, which is used to slow down the flow rate of water.

5. A sterilization system using microwave electromagnetic waves in aquaculture as described in claim 4, characterized in that, The microwave mechanism includes a microwave housing, which is connected to the slow-flow mechanism. Several microwave emission sources are arranged on both sides of the inner cavity of the microwave housing. A microwave diffuser is arranged on the top of the microwave housing, and an eddy current generator is arranged on the bottom of the microwave housing.

6. A sterilization system using microwave electromagnetic waves in aquaculture as described in claim 4, characterized in that, The other end of the microwave mechanism is equipped with an ammonia nitrogen degradation chamber, which contains an activated carbon-zeolite composite adsorption layer.

7. A sterilization system using microwave electromagnetic waves in aquaculture as described in claim 6, characterized in that, The activated carbon and zeolite in the activated carbon-zeolite composite adsorption layer are arranged alternately.

8. A sterilization system using microwave electromagnetic waves in aquaculture as described in claim 7, characterized in that, At the other end of the ammonia nitrogen degradation tank, a water curtain slow-flow tank is provided. The water curtain slow-flow tank is located on one side of the cooling pool. Several rows of slow-flow outlets are provided at the bottom of the water curtain slow-flow tank. The slow-flow outlets are narrow.

9. A sterilization system using microwave electromagnetic waves in aquaculture as described in claim 8, characterized in that, An underground cooling pool is provided below the water curtain slow-flow box. The underground cooling pool is connected to the pool to be cooled and is used to cool the water.

10. A sterilization system using microwave electromagnetic waves in aquaculture as described in claim 1, characterized in that, The backup water tank is equipped with a sampling device for extracting water samples from the backup water tank.

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