Recycled water utilization system and method for spraying of breeding house

Abstract

The invention belongs to the technical field of reuse water utilization of farms, and particularly discloses a reuse water utilization system and method for spraying of a breeding house, and the system comprises a water regeneration device which is connected with a first water storage tank through a regeneration water outlet pipe; the first water storage tank is used for temporarily storing reclaimed water, a submersible filter and a throw-in type liquid level meter are arranged in the first water storage tank, the first water storage tank is connected with the water purification tank through a filtered water outlet pipe, and the filtered water outlet pipe is further connected with a first dosing device; a first water quality detection device is arranged in the water purification tank, and water in the water purification tank is connected with the second water storage tank through a purified water outlet pipe; and the second water storage pond is connected with a second dosing device, a second water quality detection device is arranged in the second water storage pond, and the second water storage pond is externally connected with the breeding house spraying pipeline through a clear water outlet pipe. Normal operation of the spraying equipment can be guaranteed, no odor exists, reuse water is safe to use, and the health and the death rate of pig herds cannot be affected.

Description

Technical Field

[0001] This invention belongs to the field of water reuse technology in aquaculture farms, and in particular relates to a water reuse system and method for spraying aquaculture sheds. Background Technology

[0002] In existing large-scale farms, the water quality requirements for recycled water in the under-pen brushing and air deodorization processes are relatively low, and the recycling pathways have been established. However, the recycling of pigsty spraying involves the inside of the pigsty and directly affects the pigs, so the requirements for recycled water quality and pathogen indicators are high. Currently, there is no technology for pigsty spraying recycling, and the current technology uses clean water for pigsty spraying.

[0003] Using recycled water directly for spraying can lead to the following risks: 1) Biosecurity risks: Pathogenic microorganisms (bacteria, viruses, parasites) can spread through aerosols, which can easily lead to cross-infection and disease outbreaks in pigs; 2) Pig health risks: Turbid water sprayed on pigs may cause skin diseases, eye infections, etc.; 3) Environmental pollution risks: Evaporation or leakage of inferior water after spraying can worsen the air quality in the pigsty and the surrounding environment; 4) Equipment damage risks: Solid impurities and salt can easily clog and corrode the spraying system pipes and pumps.

[0004] However, the large volume and high cost of water used for pigsty spraying, coupled with water shortages in pig farms, can lead to reduced or even halted production. Against this backdrop, designing a system and method for recycling water for pigsty spraying, and utilizing recycled water in unit spraying units, has become a key research topic in the existing technology field. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a water recycling system and method for water spraying in aquaculture sheds, which solves the above problems.

[0006] To achieve the above objectives, the first aspect of the present invention discloses a water reuse system for sprinkler irrigation in livestock sheds, comprising: A water regeneration device is used for wastewater regeneration and advanced treatment. The water regeneration device is connected to a first water storage tank through a regenerated water outlet pipe. The first water storage tank is used to temporarily store reclaimed water. The first water storage tank is equipped with a submersible filter and an immersion level gauge. The first water storage tank is connected to the clean water tank through a filtered water outlet pipe. The filtered water outlet pipe is also connected to a first dosing device. The first dosing device is used to kill residual bacteria and viruses and inhibit the growth of pathogens. A water purification tank is provided, and a first water quality testing device is installed in the water purification tank. The water in the water purification tank is connected to a second water storage tank through a purified water outlet pipe. The second water storage tank is used to temporarily store purified water. The second water storage tank is connected to the second dosing device, which is used to kill microorganisms. The second water storage tank is equipped with a second water quality testing device. The second water storage tank is connected to the breeding house spray pipe through a clean water outlet pipe.

[0007] Compared with existing technologies, this application has the following advantages: In use, the water regeneration device is used to regenerate and deeply treat wastewater from the factory area, ensuring that the regenerated water meets water quality standards. Field experiments have confirmed that reclaimed water meeting these standards will not clog spray nozzles during use, and combined with the fact that it has no odor according to the senses of the feeders, thus physically clearing the path. The regenerated water is then transported to the first storage tank for filtration and purification, and a first dosing device is used to add chemicals to the filtered and purified water to kill residual bacteria and viruses and inhibit pathogen growth. Next, a first water quality testing device tests the water quality in the purified water tank. If the water quality meets the standards, the purified water is then... The purified water in the first pool is transported to the second storage pool, and simultaneously, a second dosing device is used to add chemicals to the second storage pool to kill microorganisms. Finally, a second water quality testing device is used to test the water quality in the second storage pool. If the water quality meets the standards, the clean water in the second storage pool is transported to the sprinkler pipe of the breeding house through the clean water outlet pipe. Therefore, this application, through the above-mentioned two dosing disinfection and water quality testing, ensures from a chemical perspective that the chemical indicators and residual disinfectant concentration of the disinfectant in the recycled water will not harm the pigs. At the same time, no viruses that affect the health of the pigs can be detected in the recycled water, and the bacterial content will not affect the health of the pigs, thus opening up the pathway from a chemical perspective.

[0008] In summary, the water reuse system designed in this application not only ensures the normal operation of the spraying equipment and eliminates odors, but also ensures the safe use of reused water and does not affect the health and mortality of the pig herd.

[0009] Furthermore, the water regeneration device is an MBR-ozone catalytic integrated advanced treatment system.

[0010] Furthermore, the first dosing device is connected to the MBR-ozone catalytic integrated advanced treatment system.

[0011] Furthermore, the first dosing device includes a dosing metering pump, and the filtered water outlet pipe is equipped with a filtered water pump, an inlet valve, and a pipe mixer, with the dosing metering pump connected to the filtered water outlet pipe.

[0012] Furthermore, both the first and second water storage tanks are canvas water tanks, the purified water tank is connected to the second water storage tank through a first constant pressure water supply device, and the second water storage tank is connected to the breeding shed spray pipe through a second constant pressure water supply device.

[0013] Another aspect of this application discloses a method for reusing recycled water for sprinkler systems in livestock sheds, comprising: Wastewater regeneration involves regenerating and further treating wastewater using a water regeneration device to ensure that the chemical and physical indicators of the regenerated water meet the water quality standards for spray reuse, and then transporting the qualified regenerated water to the first storage tank. The reclaimed water purification process involves filtering the reclaimed water in the first storage tank and adding chemicals to the filtered water through the first dosing device to kill residual bacteria and viruses and inhibit the growth of pathogens. The water is then sent to the clean water tank through the filtered water outlet pipe. The water purification process involves adding chemicals to the purified water. The first water quality testing device tests the water quality in the purified water tank. If the water quality meets the standards, the purified water in the purified water tank is transported to the second water storage tank through the purified water outlet pipe. Then, the second chemical dosing device adds chemicals to the second water storage tank to kill microorganisms. The recycled water is sprayed, and the water quality in the second water storage tank is tested by the second water quality testing device. If the water quality meets the standards, the clean water in the second water storage tank is transported to the spray pipe of the breeding house through the clean water outlet pipe.

[0014] Furthermore, the water regeneration device is an MBR-ozone catalytic integrated advanced treatment system to ensure that the regenerated water meets the spray reuse water quality standards, is clear and transparent like tap water, and does not clog the spray nozzles.

[0015] Furthermore, the first and second dosing devices respectively add sodium hypochlorite and potassium persulfate.

[0016] Furthermore, the chemical indicators of the spray reclaimed water quality standard are hardness ≤1000mg / L, ammonia nitrogen ≤300mg / L, COD ≤1000mg / L, nitrite nitrogen ≤15mg / L, and the residual disinfectant concentration of the reclaimed water is residual chlorine ≥0.05mg / L; meanwhile, the physical indicators are odorless, total dissolved solids ≤4000mg / L, and turbidity ≤40NTU.

[0017] Furthermore, the water quality standard for the spray reclaimed water also includes virus indicators, wherein the following viruses are not detected: A (African Swine Fever), PRRS, PED, Delta, Pasteurella, Bordetella, Haemophilus parasuis, Streptococcus, Mycoplasma pneumoniae, Rotavirus, Clostridium, and Escherichia coli; and the total bacterial count is ≤100 CFU / mL. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the wastewater purification system for the reclaimed water utilization system used in the sprinkler system of the livestock shed according to an embodiment of the present invention; Figure 2 This is a partially enlarged view of the connection between the first water storage tank and the water purification tank in an embodiment of the present invention; Figure 3 This is a schematic diagram of the clean water delivery system for the reclaimed water utilization system used for sprinkler irrigation in a livestock shed according to an embodiment of the present invention. Figure 4 This is a flow rate curve of MBR-ozone effluent under different pressures and different nozzles according to an embodiment of the present invention. Figure 5 This is a schematic diagram showing the population mortality rate and daily feed intake after water reuse in an embodiment of the present invention; Figure 6 This is a graph showing the flow rate data of MBR-ozone effluent from different nozzles over 15 days at 0.15 MPa, according to an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1-3 As shown, the first aspect of the present invention discloses a water recycling system for sprinkler systems in livestock sheds: Water regeneration device 1 is used for wastewater regeneration and advanced treatment. The water regeneration device is connected to the first water storage tank 3 through the regenerated water outlet pipe 2. The water regeneration device 1 is an MBR-ozone catalytic integrated advanced treatment system. MBR is a membrane bioreactor, which includes a biological reaction tank (using microorganisms to degrade organic matter, remove nitrogen and phosphorus) + membrane separation unit (usually microfiltration or ultrafiltration membrane). It has the advantages of clear effluent, extremely low suspended solids and total bacteria count, thereby reducing turbidity and preventing nozzle clogging. At the same time, ozone catalysis includes an ozone generator, an ozone contact reaction tank, and an exhaust gas destroyer, which can effectively decompose the recalcitrant organic matter in the MBR effluent, reduce COD, and efficiently decolorize to obtain clear water. It can also effectively kill viruses and bacteria and oxidize large molecules of recalcitrant organic matter into small molecules of easily degradable substances. The first water storage tank 3 is used to temporarily store reclaimed water. The first water storage tank 3 is equipped with a submersible filter and an immersion level gauge. The first water storage tank 3 is connected to the clean water tank 5 through the filtered water outlet pipe 4. The filtered water outlet pipe 4 is also connected to the first dosing device, which is used to kill residual bacteria and viruses and inhibit the growth of pathogens. The submersible level gauge continuously and in real-time monitors the water level in the tank by measuring water pressure and converts the level signal into a standard electrical signal (such as 4-20mA) to be transmitted to the control center (PLC, host computer). This enables functions such as low-level pump stop protection, high-level pump start, and multi-pump linkage / rotation, clearly controlling the real-time water storage volume in the tank and achieving unattended automated operation of the first water storage tank 3. In addition, the reclaimed water is first filtered through a submersible filter to intercept any residual suspended particles, gravel, biofilm fragments, pipe rust, etc., achieving physical purification. Furthermore, the first dosing device includes a dosing metering pump 6, a filter water pump 7, an inlet valve, and a pipeline mixer 8 on the filter water outlet pipe. The dosing metering pump 6 is connected to the filter water outlet pipe 4. The filter water pump 7 is used to pump the filtered water in the first water storage tank 3 to the water purification tank 5. The dosing metering pump 6 can automatically and precisely control the injection of 30 ppm sodium hypochlorite into the filter water outlet pipe 4, so that the sodium hypochlorite and the filtered water are mixed in the pipeline mixer 8 and then enter the water purification tank 5, thereby killing residual bacteria and viruses and inhibiting the growth of pathogens, ensuring that there is residual chlorine in the water purification tank 5, and inhibiting the growth of pathogens. Water purification tank 5 is equipped with a first water quality testing device. Water in water purification tank 5 is connected to a second water storage tank 10 through a purified water outlet pipe 9. The first water quality testing device is used to detect flow rate, COD, ammonia nitrogen, nitrite nitrogen, hardness, total dissolved solids, etc. When the water quality in water purification tank 5 is deemed to be qualified, feedback is sent to the control center, which then controls the pumping of purified water to the second water storage tank 10. The second water storage tank 10 is used to temporarily store clean water. The second water storage tank 10 is connected to the second dosing device 11, which is used to kill microorganisms. The second water storage tank 10 is equipped with a second water quality testing device. The second water storage tank 10 is connected to the breeding house spray pipe through the clean water outlet pipe 14. The second dosing device 11 is linked to the second water quality detection device. When the residual chlorine concentration in the second water storage tank 10 is ≤0.05mg / L, the automatic dosing system of the second water storage tank 10 is activated to add potassium persulfate monosulfate agent with a concentration of 10000mg / L to the second water storage tank 10 to ensure the residual chlorine concentration. Furthermore, the second dosing device 11 includes a dosing tank and a dosing metering pump for dispensing potassium persulfate agent. For example, if the level in the second water storage tank is below 1m, the turbidity is 13 NTU, and the level in the dosing tank is not low, with a residual chlorine concentration of 0.02 mg / L, then open the reclaimed water electric valve and start the dosing pump simultaneously, adding disinfectant while the water is being introduced; when the water level reaches 1.7m and the turbidity reaches 16 NTU, then close the reclaimed water electric valve and the dosing pump; if the dosing tank reaches a low level during the reclaimed water process, then close the reclaimed water electric valve and the dosing pump simultaneously, and add clean water when the level is below 0.9m.

[0022] Compared with existing technologies, this application has the following advantages: In use, the water regeneration device 1 is used to regenerate and deeply treat wastewater from the factory area, ensuring that the regenerated water meets water quality standards. Field experiments have confirmed that reclaimed water meeting these standards will not clog spray nozzles during use, and combined with the fact that it has no odor according to the senses of the feeders, thus physically clearing the path. The regenerated water is then transported to the first storage tank for filtration and purification, and a first dosing device is used to add chemicals to the filtered and purified water to kill residual bacteria and viruses and inhibit pathogen growth. Next, the water quality in the purified water tank is tested by a first water quality testing device. If the water quality meets the standards, the water in the purified water tank is then... The purified water is transported to the second water storage tank 10, and at the same time, the second dosing device 11 is used to add medicine to the second water storage tank 10 to kill microorganisms. Finally, the water quality in the second water storage tank 10 is tested by the second water quality testing device. If the water quality meets the standards, the clean water in the second water storage tank 10 is transported to the breeding house spray pipe through the clean water outlet pipe 14. Therefore, this application ensures from a chemical perspective that the chemical indicators and residual disinfectant concentration of the disinfectant in the recycled water will not harm the pigs through the above-mentioned two dosing disinfection and water quality testing. At the same time, no viruses that affect the health of the pigs can be detected in the recycled water, and the bacterial content will not affect the health of the pigs. Thus, the pathway is opened from a chemical perspective.

[0023] This application uses different models of nozzles for experiments and statistically analyzes the changes in nozzle flow rate over 15 days for different models, as shown in the table below (for reference). Figure 6 ):

[0024] and combined Figure 4 As shown, the flow rate of all nozzles remained stable during the 15-day usage period, indicating that the recycled water produced by the recycled water utilization system of this application did not experience nozzle clogging problems.

[0025] At the same time, such as Figure 5 As shown, the red box indicates recycled water, and the area outside the box indicates fresh water. Comparing the herd mortality rate and daily feed intake during the period of spraying with recycled water and the period of spraying with fresh water, we found that the herd mortality rate was 0.72‰ for fresh water spraying and 0.61‰ for recycled water spraying, indicating that there was no significant difference in herd mortality rate between the two periods. At the same time, the average body weight was 97.81 kg and the average feed intake was 2.48 kg for fresh water spraying, with a feed intake of 25.36 g / kg for pork. The average body weight was 89.65 kg and the average feed intake was 2.26 kg for recycled water spraying, with a feed intake of 25.21 g / kg for pork. This indicates that spraying with recycled water did not affect the herd feed intake. Therefore, the recycled water produced using the recycled water utilization system of this application has not caused any problems affecting the growth or mortality of pigs.

[0026] In summary, the water reuse system designed in this application not only ensures the normal operation of the spraying equipment and eliminates odor, but also ensures the safe use of recycled water. Using recycled water for spraying will not affect the health or feed intake of pigs, indicating that recycled water can be safely used for spraying in pig farms.

[0027] Following the above embodiments, a more preferable embodiment is that the first dosing device is connected to the MBR-ozone catalytic integrated advanced treatment system to further kill pathogens and maintain the residual chlorine concentration in the water, inhibiting the reproduction of pathogens and improving the treatment effect of reclaimed water.

[0028] Following the above embodiment, more specifically, both the first water storage tank 3 and the second water storage tank 10 are canvas water tanks, the clean water tank 5 is connected to the second water storage tank 10 through the first constant pressure water supply device 12, and the second water storage tank 10 is connected to the breeding house spray pipe through the second constant pressure water supply device 13.

[0029] Among them, the canvas water tank has the advantages of low cost, easy installation, high corrosion resistance, strong adaptability and visibility; in addition, the first constant pressure water supply device 12 and the second constant pressure water supply device 13 not only facilitate water source switching and ensure water safety, but also ensure stable and sufficient water pressure and volume.

[0030] In one embodiment, there are two water purification tanks 5, namely a first water purification tank and a second water purification tank. The equipment associated with the first constant pressure water supply device 12 includes an electric valve for the outlet of the first water purification tank, an electric valve for the outlet of the second water purification tank, a first self-priming pump, a second self-priming pump, a first booster pump, a second booster pump, a submersible level gauge for the first water purification tank, and a submersible level gauge for the second water purification tank. In automatic operation mode, the first constant pressure water supply device 12 determines whether to use the recycled water in the water purification tank 5 based on whether the water quality qualified button (first water quality detection device) is turned on. The water quality test results need to be sent for testing or self-tested by environmental technicians in accordance with the spray recycled water quality standards. After all test results are issued and qualified, the water quality qualified button of the corresponding water purification tank is manually turned on.

[0031] Taking the first water purification tank as an example, after the water quality qualified button is turned on, the electric valve of the first water purification tank outlet will be opened in automatic mode, and the first booster pump will be turned on at the same time. The opening frequency of the first booster pump is controlled by the pressure of the outlet water pipe to ensure constant outlet water pressure, which is currently set to 0.45MPa. The first booster pump and the second booster pump switch at timed intervals, and the switching time can be manually adjusted, which is currently set to 120min. The self-priming pump's starting condition is pressure-controlled, with a low-pressure start and a high-pressure stop. The start and stop pressures can be manually adjusted. Currently, the start pressure is ≤0.35MPa and the stop pressure is ≥0.46MPa. The first and second self-priming pumps are switched at a timer, and the switching duration can be manually adjusted. The current setting is 120min. Constant pressure water supply is achieved through the first self-priming pump, the second self-priming pump, the first booster pump, and the second booster pump described above.

[0032] In addition, when the water purification tank 5 reaches a low liquid level, the self-priming pump and booster pump will automatically stop and the electric valve will be closed; or when the water quality qualified button is turned off, the self-priming pump and booster pump will automatically stop and the electric valve will be closed, thereby preventing unqualified recycled water from being delivered to the second water storage tank 10, and preventing the self-priming pump and booster pump from running dry due to lack of liquid.

[0033] The second constant pressure water supply device 13 is equipped with three constant pressure water supply pumps, which adjust the frequency according to the pressure in the pipeline to ensure constant pressure in the pipeline. In one embodiment, the pressure is set to 0.25 MPa. When the pressure is lower than 0.15 MPa, the No. 1 variable frequency pump is started; when the pressure remains lower than 0.15 MPa for 30 seconds, the No. 2 variable frequency pump is started; when the pressure remains lower than 0.15 MPa for 30 seconds, the No. 3 variable frequency pump is started.

[0034] Another aspect of this application discloses a method for reusing recycled water for sprinkler systems in livestock sheds, comprising: Wastewater regeneration involves regenerating and further treating wastewater using a water regeneration unit 1 to ensure that the chemical and physical indicators of the regenerated water meet the standards for spray reuse water quality. The qualified regenerated water is then transported to the first storage tank. The water regeneration unit 1 is an MBR-ozone catalytic integrated advanced treatment system to ensure that the regenerated water meeting the spray reuse water quality standards is clear and transparent, similar to tap water, with viruses largely eliminated, and does not clog the spray nozzles. The chemical indicators for the spray reuse water quality standards are: hardness ≤1000 mg / L, ammonia nitrogen ≤300 mg / L, COD ≤1000 mg / L, nitrite nitrogen ≤15 mg / L, and a residual disinfectant concentration of ≥0.05 mg / L. Simultaneously, the physical indicators are: odorless, total dissolved solids ≤4000 mg / L, and turbidity ≤40 NTU. Furthermore, the water quality standards for spray reclaimed water also include virus indicators. The virus indicators are: no detection of A (African Swine Fever), PRRS, PED, Delta, Pasteurella, Bordetella, Haemophilus parasuis, Streptococcus, Mycoplasma pneumoniae, Rotavirus, Clostridium, and Escherichia coli; and a total bacterial count ≤100 CFU / mL.

[0035] The reclaimed water purification process involves filtering the reclaimed water in the first storage tank 3, and adding chemicals to the filtered water through the first dosing device to kill residual bacteria and viruses and inhibit the growth of pathogens. The water is then sent to the clean water tank 5 through the filtered water outlet pipe 4. The water purification process involves adding chemicals to the purified water. The first water quality testing device tests the water quality in the water purification tank 5. If the water quality meets the standards, the purified water in the water purification tank 5 is transported to the second water storage tank 10 through the purified water outlet pipe 9. The second chemical dosing device 11 then adds chemicals to the second water storage tank 19 to kill microorganisms. The recycled water is sprayed, and the water quality in the second water storage tank 10 is tested by the second water quality testing device. If the water quality meets the standards, the clean water in the second water storage tank 10 is transported to the breeding house spray pipe through the clean water outlet pipe 14.

[0036] The first dosing device and the second dosing device 11 respectively add sodium hypochlorite and potassium persulfate, and the first water storage tank 3 and the second water storage tank 10 are both canvas water tanks.

[0037] In use, the first water storage tank 3 is equipped with a submersible filter and an immersion level gauge. After the first water storage tank 3 reaches the high level, the dosing pump 6 of the first dosing device is automatically turned on to add sodium hypochlorite at a concentration of 30 ppm. Then, the inlet valve is opened, and finally the filter water pump 7 is started. The filter water pump 7 then pumps the water in the first water storage tank 3 through the filter outlet pipe 4 to the clean water tank 5. At the same time, the dosing pump 7 adds 30 ppm of sodium hypochlorite to the filter outlet pipe 4 to ensure that the water entering the clean water tank 5 is disinfected by sodium hypochlorite.

[0038] It should be noted that, in order to ensure the sustainability of production operations, the water purification tank 5 includes a first water purification tank and a second water purification tank. Therefore, when pumping water, it is necessary to simultaneously determine which water purification tank to enter. The determination conditions are: ① Water purification tank 5 will not enter when the water quality qualified button is turned on; ② Water purification tank 5 will not enter when the outlet valve is turned on; ③ Water purification tank 5 will not enter when it reaches a high liquid level.

[0039] For example, after the first water purification tank reaches a high level, if the water quality pass button (detection by the first water quality testing device) of the first water purification tank is in the open state, only the inlet valve of the second water purification tank can be opened; if the outlet valve of the first water purification tank is in the open state, only the inlet valve of the second water purification tank can be opened; if the water quality pass button of the first water purification tank is open and the outlet valve of the second water purification tank is in the open state, neither inlet valve can be opened. Through the above design, it is ensured that no more water will enter the first and second water purification tanks when water is discharged, and the water quality of the discharged water is qualified, thereby ensuring the water quality for the next process.

[0040] If the first water storage tank 3 reaches a low liquid level, the dosing metering pump 6, the filter water pump 7, and the inlet valve will be shut off simultaneously, meaning that the first water storage tank 3 will no longer discharge water.

[0041] After the water purification tank 5 is full, the environmental technician will send or test the relevant water quality indicators in advance according to the spraying recycled water quality standards. After all the test results are issued and qualified, the technician will manually press the water quality qualified button of the corresponding water tank. In automatic operation mode, the first constant pressure water supply device 12 determines which water purification tank to use recycled water based on whether the water quality qualified button is turned on. Note: ① Only one water quality qualified button can be turned on at a time to prevent system judgment logic errors. ② After the water quality qualified button is turned on, water intake is prohibited until the water level in the water purification tank 5 reaches the low level. ③ If the water quality is qualified and the test result is unqualified again, manually turn off the "water quality qualified" button. Unqualified water should be treated according to the actual situation and discharged into the water tank under the board or returned to the field for reuse.

[0042] To ensure a constant pressure water supply to the water purification tank 5, the first constant pressure water supply device 12 described above is used, and its specific structure is shown above.

[0043] As described above, the inlet pipe of the second water storage tank 10 is arranged such that an electromagnetic flow meter and an electric valve are installed on the recycled water inlet pipe. A pipe is installed between the outlet end of the electromagnetic flow meter and the inlet end of the electric valve to the dosing tank for preparing potassium persulfate. The outlet pipe of the dosing metering pump is connected to the outlet of the electric valve on the recycled water pipe. After being mixed evenly with the recycled water by hydraulic stirring, the water enters the second water storage tank 10. In addition, an electromagnetic flow meter and an electric valve are installed in the clean water inlet pipe, and a pipe is installed between the outlet end of the electromagnetic flow meter and the inlet end of the electric valve to the vicinity of the water distributor inlet.

[0044] The second water storage tank 10 is equipped with an online turbidity and residual chlorine detector, as well as a level gauge (i.e., the second water quality detection device). The water inlet of the second water storage tank 10 is controlled by the level, with 4 level control points: clear water high and low level control and reclaimed water high and low level control (the high and low level parameters can be manually adjusted). The clear water replenishment level is 0.9m, the clear water stop replenishment level is 1.2m, the reclaimed water replenishment level is 1m, and the reclaimed water stop replenishment level is 1.7m. Clean water replenishment logic: When the liquid level is below 0.9m, the clean water replenishment electric valve opens; when the liquid level is above 1.2m, the clean water replenishment electric valve closes. Reclaimed water makeup water dosing logic: The dosing tank has a volume of 300L and is used to prepare Water Prince (potassium persulfate) solution. Water Prince powder:water = 1:100, meaning 3kg of Water Prince powder is added to one tank of water. When the liquid level is 1m below the reclaimed water makeup water level, the following logic is applied: ① First, turbidity is checked. If the turbidity is below the limit, a second check is performed. ② The stainless steel side-mounted float switch checks if the liquid level in the dosing tank is low. If it is not low and the turbidity is below the limit, the reclaimed water electric valve is opened. If any of these conditions are not met, the reclaimed water electric valve cannot be opened, and a third check is performed. ③ The residual chlorine concentration is checked to see if it is ≥0.05mg / L. If it is ≥0.05mg / L, the dosing pump does not start. If it is <0.05mg / L, the dosing pump is started when the reclaimed flow rate is greater than 5m³ / h.

[0045] Example: If the level in the second storage tank (10) is below 1m, the turbidity is 13 NTU, and the dosing tank level is not low, with a residual chlorine concentration of 0.02 mg / L, then open the reclaimed water electric valve and simultaneously start the dosing pump to add disinfectant while the water is being introduced. When the influent level reaches 1.7m and the turbidity reaches 16 NTU, then close the reclaimed water electric valve and the dosing pump. If the dosing tank reaches a low level during the reclaimed water process, then simultaneously close the reclaimed water electric valve and the dosing pump. When the level is below 0.9m, add clean water.

[0046] To ensure constant pressure water supply for the unit spray, the second constant pressure water supply device 13 described above is used, and its specific structure is shown above.

[0047] Other emergency solutions of this invention: If the equipment in the water purification tank 5 malfunctions and cannot supply recycled water to the second water storage tank 10, and if the second water storage tank 10 reaches the clean water replenishment level, clean water will be replenished to the second water storage tank 10 through an external clean water pipe. If the quality of the recycled water does not meet the standards, the recycled water from the water purification tank 5 will be transported to the water purification tank under the brush ring or used for returning to the field. After that, the water that meets the standards will be used to clean and spray the water purification tank 5 until no specific virus is detected. If problems such as leakage in the second water storage tank 10, failure of the variable frequency pump, or failure of the level gauge occur, and water cannot be supplied to the breeding house through the second constant pressure water supply device 13, then the spare water inlet of the breeding house water distributor will spray water to the breeding house.

[0048] In other words, when components such as the water purification tank 5 and the second water storage tank 10 are working properly, recycled water is used; when the water purification tank 5 and the preceding processes malfunction, and the second water storage tank 10 reaches a low level, water is supplied to the second water storage tank through an external clean water pipe; when the water quality of the water purification tank 5 does not meet the standards, the water from the water purification tank 5 is supplied to other places where water is used to ensure that recycled water is not wasted; when components such as the second water storage tank 10 malfunction, water is supplied to the breeding shed through an external clean water pipe connected to a water distributor.

[0049] In summary, this application has the following effects: ① This invention identifies water quality and pathogen indicators affecting pigsty spraying and develops a water quality standard that prevents nozzle clogging; ② The MBR+ozone process parameters are adjusted to produce high-standard recycled water, with a clear and transparent color similar to tap water, meeting the water quality standard for preventing nozzle clogging; ③ An automatic dosing system is installed on the pipeline system of the water purification tank 5 to maintain the disinfectant content in the purified water and inhibit pathogen reproduction; ④ An automatic dosing system is installed at the inlet of the second water storage tank 10 to ensure that the disinfectant concentration in the second water storage tank 10 meets the disinfectant residue standard of Muyuan clean water; ⑤ The water in the water purification tank 5 is tested daily to ensure water supply safety; ⑥ Through a constant pressure water supply + automatic level control switching system, the water in the water purification tank 5 is supplied to the second water storage tank 10, and the second water storage tank 10 supplies water to the unit at constant pressure, ensuring stable water volume and pressure in the unit; ⑦ The second water storage tank 10 is equipped with online water quality monitoring equipment for relevant indicators (residual chlorine). ⑧ Risk management: Manually control the shutdown of the reuse water supply system after a positive pathogen indicator test; stop supplying reuse water to the production area when the reuse system malfunctions or the reuse water does not meet the standards; ⑨ Water source switching: When the level of the second water storage tank 10 is lower than the clean water replenishment level, the clean water replenishment electric valve opens to replenish clean water; when the level of the second water storage tank 10 is higher than the clean water replenishment level, the clean water replenishment electric valve closes; when the level of the second water storage tank 10 is lower than the reuse water replenishment level, the reuse water replenishment electric valve opens to replenish reuse water; when the level of the second water storage tank 10 is higher than the reuse water replenishment level, the reuse water replenishment electric valve closes; ⑩ Cleaning of water in the clean water tank 5 if the water quality is unqualified (chemical indicators are unqualified or viruses are detected): Through the valve switching of the first constant pressure water supply device 12, the water in the clean water tank 5 is transported to the under-board brush ring reuse water tank or the field water tank. Unqualified water is downgraded and used for under-board brush rings or water-fertilizer return to the field, etc.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water recycling system for sprinkler irrigation in livestock sheds, characterized in that, include: A water regeneration device is used for wastewater regeneration and advanced treatment. The water regeneration device is connected to a first water storage tank through a regenerated water outlet pipe. The first water storage tank is used to temporarily store reclaimed water. The first water storage tank is equipped with a submersible filter and an immersion level gauge. The first water storage tank is connected to the clean water tank through a filtered water outlet pipe. The filtered water outlet pipe is also connected to a first dosing device. The first dosing device is used to kill residual bacteria and viruses and inhibit the growth of pathogens. A water purification tank is provided, and a first water quality testing device is installed in the water purification tank. The water in the water purification tank is connected to a second water storage tank through a purified water outlet pipe. The second water storage tank is used to temporarily store purified water. The second water storage tank is connected to the second dosing device, which is used to kill microorganisms. The second water storage tank is equipped with a second water quality testing device. The second water storage tank is connected to the breeding house spray pipe through a clean water outlet pipe.

2. The water reuse system for sprinkler irrigation in livestock sheds according to claim 1, characterized in that, The water regeneration device is an MBR-ozone catalytic integrated advanced treatment system.

3. The water reuse system for sprinkler irrigation in livestock sheds according to claim 2, characterized in that, The first dosing device is connected to the MBR-ozone catalytic integrated advanced treatment system.

4. A water reuse system for sprinkler irrigation in livestock sheds according to any one of claims 1-3, characterized in that, The first dosing device includes a dosing metering pump. The filtered water outlet pipe is equipped with a filtered water pump, an inlet valve, and a pipe mixer. The dosing metering pump is connected to the filtered water outlet pipe.

5. A water reuse system for sprinkler irrigation in livestock sheds according to claim 1, characterized in that, Both the first and second water storage tanks are canvas water tanks. The purified water tank is connected to the second water storage tank through a first constant pressure water supply device. The second water storage tank is connected to the breeding shed spray pipe through a second constant pressure water supply device.

6. A method for reusing recycled water for sprinkler systems in livestock sheds, characterized in that, include: Wastewater regeneration involves regenerating and further treating wastewater using a water regeneration device to ensure that the chemical and physical indicators of the regenerated water meet the water quality standards for spray reuse, and then transporting the qualified regenerated water to the first storage tank. The reclaimed water purification process involves filtering the reclaimed water in the first storage tank and adding chemicals to the filtered water through the first dosing device to kill residual bacteria and viruses and inhibit the growth of pathogens. The water is then sent to the clean water tank through the filtered water outlet pipe. The water purification process involves adding chemicals to the purified water. The first water quality testing device tests the water quality in the purified water tank. If the water quality meets the standards, the purified water in the purified water tank is transported to the second water storage tank through the purified water outlet pipe. Then, the second chemical dosing device adds chemicals to the second water storage tank to kill microorganisms. The recycled water is sprayed, and the water quality in the second water storage tank is tested by the second water quality testing device. If the water quality meets the standards, the clean water in the second water storage tank is transported to the spray pipe of the breeding house through the clean water outlet pipe.

7. A method for reusing recycled water for irrigation in livestock sheds according to claim 6, characterized in that, The water regeneration device is an MBR-ozone catalytic integrated advanced treatment system to ensure that the regenerated water meets the spray reuse water quality standards, is clear and transparent like tap water, and does not clog the spray nozzles.

8. A method for reusing recycled water for irrigation in livestock sheds according to claim 6, characterized in that, The first and second dosing devices dispense sodium hypochlorite and potassium persulfate, respectively.

9. A method for reusing recycled water for irrigation in livestock sheds according to any one of claims 6-8, characterized in that, The chemical indicators for the spray reclaimed water quality standards are hardness ≤1000mg / L, ammonia nitrogen ≤300mg / L, COD ≤1000mg / L, nitrite nitrogen ≤15mg / L, and the total residual disinfectant concentration in the reclaimed water is residual chlorine ≥0.05mg / L. Meanwhile, the physical indicators are odorless, total dissolved solids ≤4000mg / L, and turbidity ≤40NTU.

10. A method for reusing recycled water for irrigation in livestock sheds according to claim 9, characterized in that, The water quality standards for the spraying and reused water also include virus indicators, which are: no detection of A (African Swine Fever), PRRS, PED, Delta, Pasteurella multocida, Bordetella bronchiseptica, Haemophilus parasuis, Streptococcus, Mycoplasma pneumoniae, Rotavirus, Clostridium, and Escherichia coli, and a total bacterial count ≤100 CFU / mL.

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