A low-consumption and high-efficiency pig farm microbial deodorization system and method

Abstract

The present invention discloses a low-consumption and high-efficiency pig farm microbial deodorization system and method, which belongs to the field of animal husbandry technology. The system improves the defects existing in the current operation process. According to the characteristics of the deodorized water quality and the operating rules, the deodorized water is collected in a circulating water pool. The deodorized water in the circulating water pool is first filtered through river sand to remove suspended matter and large particles of dust, and then enters the reactor. The organic matter in the deodorized water is physically adsorbed on the surface of activated carbon and undergoes biochemical reactions with the microbial cells on the surface of the activated carbon to remove organic matter and ammonia nitrogen. Finally, the deodorized water flows from the top of the reactor into the circulating water pool by gravity and is reused. The method is realized by this system. The system has a strong effect of improving the quality of circulating water, so that the deodorized water has the effect of continuously removing ammonia nitrogen and the characteristic of being able to be recycled for a long time. There is no need to change water, which reduces the waste of water resources, achieves the effect of integration and zero emission, and reduces the operating cost of the deodorization process.

Description

Technical Field

[0001] The present invention relates to the technical field of animal husbandry, and in particular to a low-consumption and high-efficiency pig farm microbial deodorization system and method. Background Art

[0002] In recent years, with the rapid development of intensive and large-scale pig farms, odor emissions from pig farms have become a major concern and a major environmental challenge. Currently, large-scale pig farms primarily use side-spray wet curtains for deodorization, but this process has the following two issues.

[0003] (1) Large water loss. The side-spray wet curtain process uses a mechanical nozzle to spray water on the wet curtain, dissolving pollutants such as dust, ammonia, and volatile organic matter in the odor into the water. The gas is discharged after washing with water, and the water is collected at the bottom and then circulated for spraying. However, as the concentration of pollutants in the deodorizing water gradually increases, the deodorizing efficiency will be reduced, and the water volume of the nozzle will be reduced or even blocked. Therefore, the deodorizing water must be replaced regularly. The usage cycle is generally 7 to 10 days. The amount of water replaced at one time varies from tens to hundreds of tons depending on the scale of the pig farm. The cost of water resources in intensive pig farms is relatively high. Therefore, the large amount of water consumed is an important factor affecting the frequency of opening.

[0004] (2) The deodorization process produces a large amount of deodorized water as a by-product. After the deodorized water reaches the saturation point of water washing, it needs to be replaced in time, otherwise the deodorization efficiency will be greatly reduced. After the odor is washed, the pollutants in the odor are transferred to the water body, resulting in a high concentration of pollutants such as organic matter and ammonia nitrogen, which cannot be discharged directly. The current treatment method is to enter the sewage treatment plant through the pipeline network for treatment together with the pig farm manure. Due to the complexity of pig farm manure, its treatment cost is currently high, which increases the back-end treatment water volume and increases the operating cost of the deodorization process. The above two reasons have led to the high cost of using the current pig farm deodorization process. Improper operation will also affect the deodorization effect. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a low-cost and high-efficiency pig farm microbial deodorization system and method. The system removes suspended matter and large particles of dust from the deodorized water in the circulating water pool by filtering, and then removes organic matter and ammonia nitrogen through physical-biochemical reactions. Finally, the water is returned to the circulating water pool for reuse. This allows the deodorized water to continuously remove ammonia nitrogen and can be recycled for a long time without the need for water replacement, greatly reducing the water resource consumption of the deodorization process. No treatment by-products are produced, thereby reducing the operating costs of the deodorization process.

[0006] The technical solution adopted in the present invention is:

[0007] A low-cost and high-efficiency pig farm microbial deodorization system, comprising a deodorizing wet curtain and a deodorizing nozzle installed at the pig farm fan outlet, wherein the deodorizing nozzle can spray deodorizing water onto the deodorizing wet curtain, and further comprising:

[0008] The deodorizing water collection system comprises a circulating water pool, which is arranged below the deodorizing nozzle and the deodorizing wet curtain and can collect deodorizing water; the circulating water pool is connected to the deodorizing nozzle via a circulating pipe, and a flow-controlled water pump is provided on the circulating pipe to return the deodorizing water in the circulating water pool to the deodorizing nozzle for reuse;

[0009] The suspended matter filtration system comprises a filter filled with river sand; the water inlet of the filter is connected to the circulating water pool, and the deodorized water in the circulating water pool enters the filter to remove suspended matter and large dust particles;

[0010] The water treatment system comprises a reactor filled with granular activated carbon, the surface of which is adsorbed with microbial cells, which form a biofilm on the surface of the granular activated carbon; the water inlet of the reactor is connected to the water outlet of the filter, and the water outlet of the reactor is connected to the circulating water pool; the deodorized water treated by the filter enters the reactor, undergoes physical-biochemical reactions to remove organic matter and ammonia nitrogen, and then returns to the circulating water pool for reuse.

[0011] In the deodorization system of the present application, the deodorization water collection system further comprises a water-isolating net, which is arranged above the circulating water pool and can filter the deodorization water mist generated by the deodorization nozzle from the air to the circulating water pool.

[0012] In the deodorization system of the present application, the filter is a sealed tank body, a water inlet is provided at the bottom end thereof, and a water outlet is provided at the top end thereof.

[0013] In the deodorization system of the present application, a flow control water pump is provided at the bottom of the circulating water pool, and the flow control water pump is connected to the water inlet of the filter, and water inlet and outlet of the filter are realized through the flow control water pump.

[0014] In the deodorization system of the present application, the top of the reactor is open, and an aeration plate is provided at the bottom, and the aeration plate is connected to an aeration pump.

[0015] In the deodorization system of the present application, a water inlet is provided at the bottom end of the reactor and a water outlet is provided at the top. The height of the water outlet of the reactor is higher than the height of the circulating water pool, so that the deodorized water treated by the reactor can flow back to the circulating water pool by itself.

[0016] Based on the same inventive concept, the present application also provides a low-cost and high-efficiency pig farm microbial deodorization method, comprising the following steps:

[0017] Step S1. Filling the filter with river sand; filling the reactor with granular activated carbon, and subjecting the reactor to biofilm formation, so that microbial cells form a biofilm on the surface of the granular activated carbon;

[0018] Step S2. The deodorizing nozzle sprays deodorizing water onto the deodorizing wet curtain. When the odor passes through the deodorizing wet curtain, the dust, ammonia, and volatile organic matter in the odor are dissolved into the deodorizing water. The odor is washed and discharged, and the deodorizing water flows into the circulating water pool below.

[0019] Step S3. The deodorized water in the circulating pool enters the filter through a flow-controlled water pump, is filtered through river sand to remove suspended solids and large dust particles, and then discharged from the filter;

[0020] Step S4. The bottom of the reactor is aerated, and deodorized water, after being treated by the filter, enters the bottom of the reactor. Organic matter in the deodorized water is physically adsorbed on the surface of the activated carbon and undergoes a biochemical reaction with the microbial cells on the surface of the activated carbon, removing organic matter and ammonia nitrogen. The water then flows from above into the circulating water tank.

[0021] Step S5. The deodorized water in the circulating water pool enters the deodorizing nozzle through a flow-controlled water pump, thereby realizing the recycling of the deodorized water.

[0022] In the deodorization method of the present application, in step S1, the reactor uses deodorized water that has been circulated for 5 to 10 days to form biofilm.

[0023] In the deodorization method of the present application, in step S4, when the reactor is running, the dissolved oxygen concentration is controlled between 1 and 5 mg / L, and when the dissolved oxygen is lower than 1 mg / L, the aeration pump is turned on.

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

[0025] (1) The deodorization system and method of the present application are improvements to the defects existing in the current operation process. According to the characteristics of the deodorized water quality and the operating rules, the deodorized water is collected in a circulating water pool. The deodorized water in the circulating water pool is first filtered through river sand to remove suspended matter and large particles of dust, and then enters the reactor. The organic matter in the deodorized water is physically adsorbed on the surface of the activated carbon and undergoes biochemical reactions with the microbial cells on the surface of the activated carbon to remove organic matter and ammonia nitrogen. Finally, the deodorized water flows from the top of the reactor into the circulating water pool for repeated use. The system has a strong effect on improving the quality of circulating water, so that the deodorized water has the effect of continuously removing ammonia nitrogen and can be recycled for a long time without the need to change the water, thereby reducing the waste of water resources.

[0026] (2) This application uses integrated devices such as filtration and contact oxidation to treat deodorized circulating wastewater, so that the deodorized water always maintains a high deodorization efficiency, greatly extends its service life, greatly reduces the water resource consumption of the deodorization process, and does not produce any treatment by-products, thereby reducing the wastewater treatment volume of the pig farm, achieving an integrated, zero-emission effect, and reducing the operating costs of the deodorization process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a schematic diagram of the structure of a low-cost and high-efficiency pig farm microbial deodorization system;

[0029] Figure 2 This is the pH change diagram of deodorized water during the operation of the original system;

[0030] Figure 3 This is a graph showing changes in ammonia nitrogen concentration in deodorized water during the operation of the original system;

[0031] Figure 4 This is the COD concentration change diagram of the deodorized water during the operation of the original system;

[0032] Figure 5 This is a diagram showing the odor removal effect of deodorized water during the operation of the original system;

[0033] Figure 6 A graph showing changes in pH of deodorized water during operation of the deodorization system of the present application;

[0034] Figure 7 A graph showing changes in ammonia nitrogen concentration in deodorized water during operation of the deodorization system of the present application;

[0035] Figure 8 A graph showing the COD concentration variation of deodorized water during operation of the deodorization system of the present application;

[0036] Figure 9 This is a diagram showing the odor removal effect of deodorized water during the operation of the deodorization system of this application.

[0037] Reference numerals:

[0038] 1. Circulating water pool; 2. Waterproof net; 3. Deodorizing nozzle; 4. Circulating pipe; 5. Reactor; 6. Aeration pump; 7. Aeration plate; 8. Filter; 9. Flow control water pump. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] See also Figures 1 to 9 As shown, the embodiment of the present application provides a low-consumption and high-efficiency pig farm microbial deodorization system and method, the main purpose of which is to solve the problem that the deodorization efficiency of the existing circulating deodorized water is greatly reduced as the operating time increases, and it needs to be replaced regularly, resulting in serious waste of water resources.

[0044] See Figure 1 As shown, the present application discloses a low-consumption and high-efficiency pig farm microbial deodorization system, which includes a deodorizing wet curtain (not shown) installed at the pig farm fan outlet and a deodorizing nozzle 3, which is used to spray deodorizing water onto the deodorizing wet curtain, and also includes:

[0045] The deodorized water collection system features a circulating water tank 1, located below the deodorizing nozzles 3 and a deodorizing wet curtain, to collect deodorized water. This circulating water tank 1 is connected to the deodorizing nozzles 3 via a circulation pipe 4, which is equipped with a flow-controlled water pump 9 that returns the deodorized water from the circulating water tank 1 to the deodorizing nozzles 3 for reuse. Side-spraying deodorizing wet curtains are installed at the pig farm's fan outlets. The deodorizing nozzles 3 spray deodorizing water onto the wet curtains, dissolving pollutants such as dust, ammonia, and volatile organic compounds in the odor into the water. The gases are then washed with water before being discharged. The deodorized water is collected in the circulating water tank 1 at the bottom and then circulated for spraying.

[0046] As the deodorizing water cycle time increases, the concentration of pollutants in the water gradually increases, deodorizing efficiency gradually decreases, and the deodorizing nozzles 3 are prone to water flow reduction or even clogging. Therefore, the deodorizing water must be replaced regularly. In actual operation, the deodorizing water cycle is generally 7-10 days, and the amount of water replaced at a time varies from tens to hundreds of tons, depending on the scale of the pig farm. This makes water resource utilization costs in intensive pig farms high. Furthermore, the amount of deodorizing water produced is large, and treating it together with pig manure increases the wastewater treatment volume and treatment costs.

[0047] Based on this, the present application sets up a suspended matter filtration system and a water quality treatment system to remove suspended matter, large particles of dust, organic matter and ammonia nitrogen in the deodorized water, and then returns the deodorized water to the circulating water pool 1 for reuse.

[0048] Specifically, the suspended matter filtration system includes a filter 8 filled with river sand, which removes suspended matter and large dust particles from the deodorized water. The water inlet of the filter 8 is connected to the circulating water tank 1. The deodorized water in the circulating water tank 1 enters the filter 8 to remove suspended matter and large dust particles.

[0049] Specifically, the water treatment system includes a reactor 5 filled with granular activated carbon. Microbial cells are adsorbed on the surface of the granular activated carbon, forming a biofilm on the surface of the granular activated carbon. The water inlet of the reactor 5 is connected to the water outlet of the filter 8, which is in turn connected to the circulating water tank 1. Deodorized water treated by the filter 8 enters the reactor 5, undergoes physical-biochemical reactions, and removes organic matter and ammonia nitrogen. The water then returns to the circulating water tank 1 for reuse. Granular activated carbon has excellent adsorption capacity. After the deodorized water enters the reactor 5, organic matter in the water is physically adsorbed on the surface of the activated carbon and undergoes biochemical reactions with the microbial cells on the surface. This results in a high localized oxidation rate, breaking the original concentration equilibrium limit, prolonging the contact time between the microbial cells and the organic matter, and rapidly and thoroughly degrading the organic matter. The biological reactions then restore the physical adsorption capacity of the activated carbon surface, ensuring that the water treatment system maintains high treatment efficiency, significantly improving the deodorized water quality, and maintaining the deodorization efficiency of the deodorized water.

[0050] The deodorization system of the present application is improved to address the defects existing in the current operation process. According to the characteristics of the deodorized water quality and the operation rules, the deodorized water in the circulating water pool 1 is filtered to remove suspended matter and large particles of dust, and then the organic matter and ammonia nitrogen are removed through physical-biochemical reactions, and finally returned to the circulating water pool 1 for reuse; the present application uses integrated devices such as filtration and contact oxidation to treat the deodorized circulating wastewater, so that the deodorized water always maintains a high deodorization efficiency, greatly extends the service life, greatly reduces the water resource consumption of the deodorization process, and no treatment by-products are generated, thereby reducing the wastewater treatment volume of the pig farm, achieving the effect of integration and zero emissions, and reducing the operating costs of the deodorization process.

[0051] In one embodiment, the deodorizing water collection system further comprises a water-isolating net 2, which is arranged above the circulating water pool 1 and can filter the deodorizing water mist generated by the deodorizing nozzle 3 from the air to the circulating water pool 1, thereby reducing the waste of deodorizing water.

[0052] In one embodiment, filter 8 is a sealed tank that prevents the odor of the deodorized water from escaping. Filter 8 has a water inlet at its bottom and a water outlet at its top. The inlet is connected to the circulating water tank 1, and the outlet is connected to the reactor 5. Filter 8 in this application is an upflow sand filter device filled with river sand. Deodorized water enters the bottom of filter 8 and is filtered by the river sand during its upflow, removing suspended solids and large dust particles from the wastewater.

[0053] In one embodiment, a flow control water pump 9 is provided at the bottom of the circulating water tank 1. The flow control water pump 9 is connected to the water inlet of the filter 8, and the flow control water pump 9 realizes the water inlet and outlet of the filter 8. The present application uses the flow control water pump 9 to control the system to operate continuously, collect the deodorized water, and then pass it into the subsequent filter 8 and reactor 5 through the water pump.

[0054] In one embodiment, the top of the reactor 5 is open, and an aeration plate 7 is provided at the bottom, which is connected to an aeration pump 6. The aeration frequency of the aeration plate 7 is controlled by the aeration pump 6, thereby controlling the dissolved oxygen concentration in the reactor 5.

[0055] In one embodiment, a water inlet is provided at the bottom of the reactor 5 and a water outlet is provided at the top. The height of the water outlet is higher than the height of the circulating water pool 1, so that the deodorized water treated by the reactor 5 can flow back to the circulating water pool 1 by gravity.

[0056] The above-mentioned embodiments have introduced the structure of the low-cost and high-efficiency pig farm microbial deodorization system in detail. The following embodiments will attempt to briefly introduce the method of recycling deodorized water through this system, that is, the low-cost and high-efficiency pig farm microbial deodorization method.

[0057] The present application discloses a low-cost and high-efficiency pig farm microbial deodorization method, comprising the following steps:

[0058] Step S1. Fill the filter with river sand; fill the reactor with granular activated carbon, and perform biofilming on the reactor so that microbial cells form a biofilm on the surface of the granular activated carbon.

[0059] Step S2. The deodorizing nozzle sprays deodorizing water onto the deodorizing wet curtain. When the odor passes through the deodorizing wet curtain, the dust, ammonia, and volatile organic matter in the odor are dissolved in the deodorizing water. The odor is washed with water and then discharged. The deodorizing water flows into the circulating water pool below.

[0060] Step S3. The deodorized water in the circulating water pool enters the filter through a flow-controlled water pump, is filtered through river sand to remove suspended solids and large dust particles, and then is discharged from the filter.

[0061] Step S4. Aeration is performed at the bottom of the reactor. Deodorized water, after being treated by the filter, enters the bottom of the reactor. Organic matter in the deodorized water is physically adsorbed on the surface of the activated carbon and undergoes a biochemical reaction with the microbial cells on the surface of the activated carbon, removing organic matter and ammonia nitrogen. The water then flows into the circulating water tank from above.

[0062] Step S5. The deodorized water in the circulating water pool enters the deodorizing nozzle through a flow-controlled water pump, thereby realizing the recycling of the deodorized water.

[0063] In one embodiment, in step S1, the reactor uses deodorized water that has been circulated for 5 to 10 days for biofilm formation. Experimental results show that after 4 days of deodorized water circulation, the rising trend of pollutant concentration slows down and gradually stabilizes, and the odor concentration exceeds 200 ppm starting on the 5th day. Therefore, deodorized water from the 5th, 6th, 7th, and 10th days is used for biofilm formation, as the higher the pollutant concentration in the deodorized water, the better the biofilm formation effect.

[0064] In one embodiment, in step S4, when the reactor is in operation, the dissolved oxygen concentration is controlled between 1 and 5 mg / L. When the dissolved oxygen concentration is lower than 1 mg / L, the aeration pump is turned on. Preferably, the treatment effect of the reactor is best when the dissolved oxygen concentration is controlled between 2 and 4 mg / L.

[0065] In a specific implementation scenario, the deodorization system of this application is operated in a standardized pig farm with 2,400 pigs. The bottom circulating water pool is 18m long, 2m wide, and 0.65m deep, with a capacity of 23m³. The filter is 1m in diameter, 1.5m in height, and has a volume of 1.2m³. It is filled with river sand. The reactor is 2.5m in diameter, 2m in height, and has a volume of 9.8m³. It is filled with granular activated carbon. Among them, the filter adopts a sealed design. Water is pressurized by a flow-controlled water pump from the bottom to the top. The outlet is connected to the bottom of the reactor. Aeration facilities are installed at the bottom of the reactor. The top is open and the outlet height is higher than the circulating water pool, allowing the treated water to flow back to the circulating water pool by gravity.

[0066] The system operates continuously through a flow-controlled water pump. The deodorized water is collected and then enters the subsequent filter and reactor through the flow-controlled water pump. The water inlet flow is controlled at 1.2 m³ / h. It runs 24 hours a day, with a daily water treatment volume of 28.8 m³. The deodorized water treatment is completed once in 0.8 days. The hydraulic load of the reactor is 0.24 m³ / (㎡·h).

[0067] In a specific implementation scenario, the original deodorization system was used for operation test as a control experiment of the present application system. It was operated for 4 hours every day. After the operation, the pH, ammonia nitrogen, COD and other related water indicators of the deodorized water were tested. During the operation, a portable instrument was used to test the odor indicators inside and outside the house. The water indicators in the circulating water pool were as shown in the attached figure. Figures 2 to 5 shown.

[0068] By attaching Figure 2 It can be seen that the pH in the circulating water tank gradually increased from 7 at the beginning and reached 8.5 on the fourth day, and remained unchanged during the subsequent operation. This shows that the water circulation process alone can only maintain the deodorization process for 4 days before the ammonia solubility reaches saturation.

[0069] By attaching Figure 3 、 4 It can be seen that the concentrations of ammonia nitrogen and COD in the circulating water pool are basically similar to the pH change trend. During the first four days of operation, the pollutant concentration rose rapidly, and the subsequent concentration increase trend slowed down, showing a gradually stable state, proving that the effect of deodorized water gradually decreased and the deodorization function declined.

[0070] By attaching Figure 5As can be seen, during the initial operation of the device, the odor removal rate was high at the beginning, but gradually decreased as the deodorized water was used. On the first day, it maintained a 91% removal rate, then gradually decreased. From days 2 to 4, the removal rate remained between 81.2% and 88.3%, falling to 73.0% to 77.5% from days 5 to 7, and only 65.9% and 69.6% on days 8 and 9. Odor concentrations exceeded 200 ppm starting on the fifth day, reaching 309 ppm and 267 ppm on the last two days, with a noticeable odor. After four days of use, the deodorized water was no longer sufficient for deodorization and needed to be drained and completely replaced, resulting in a waste of water resources.

[0071] The deodorization system of the present application was tested for operation. During the operation, the deodorization process was operated at the same level as before. Deodorized water that had been circulated for 7 days was pumped into the reactor for microbial biofilm formation. During this period, water was added for 4 hours every day. The dissolved oxygen concentration was controlled between 2 and 4 mg / L. The aeration pump was turned on when the dissolved oxygen was lower than 1 mg / L. After one week, the system began to operate continuously. The deodorized water was tested once a day during the operation to determine the COD and ammonia nitrogen concentrations. The test was carried out for 20 consecutive days. The test results are shown in the attached figure. Figures 6-9 shown.

[0072] As attached Figure 6 As shown, after adopting the deodorization system of the present application, the pH of the deodorized water will gradually increase in the early stage of operation and then gradually stabilize, but the pH will subsequently stabilize between 7.6-7.8, which is lower than 8.5 of the original system, proving that the deodorized water can always keep dissolving ammonia. This is mainly because the ammonia is degraded in the water treatment system and the ammonia nitrogen in the odor is redissolved, so that the dissolution-degradation is maintained in a balanced state, proving that the system has the effect of continuously removing ammonia nitrogen without the need to change water.

[0073] As attached Figure 7 、 8 As shown in the figure, after 20 days of continuous monitoring, the ammonia nitrogen concentration and COD concentration in the water quality rose rapidly at the beginning, and gradually stabilized after about one week of operation. The ammonia nitrogen concentration stabilized between 20 and 30 mg / L, and the COD concentration stabilized at around 80 mg / L, which were much lower than the pollutant concentrations in the original system. This shows that the circulating water has the characteristics of long-term recycling and reduces the waste of water resources.

[0074] As attached Figure 9 As shown in the figure, after 20 days of continuous operation, the deodorized water has maintained a high removal efficiency for odor. Except for the 18th day, the removal efficiency has been maintained at more than 80% at other times. Compared with the original system which only ran for 4 days, it has a stronger effect of improving the circulating water quality. The deodorized water can be used for a long time without producing any treatment by-products.

[0075] The deodorization system and method of the present application are improvements aimed at the defects existing in the current operation process. According to the characteristics of the deodorized water quality and the operation rules, the deodorized water is collected in a circulating water pool. The deodorized water in the circulating water pool is first filtered through river sand to remove suspended matter and large particles of dust, and then enters the reactor. The organic matter in the deodorized water is physically adsorbed on the surface of the activated carbon and undergoes biochemical reactions with the microbial cells on the surface of the activated carbon to remove organic matter and ammonia nitrogen. Finally, the water flows by gravity from the top of the reactor into the circulating water pool for repeated use. The system has a strong effect of improving the quality of circulating water, so that the deodorized water has the effect of continuously removing ammonia nitrogen and the characteristics of long-term recycling. There is no need to change the water, which reduces the waste of water resources.

[0076] This application uses integrated devices such as filtration and contact oxidation to treat deodorized circulating wastewater, so that the deodorized water always maintains a high deodorization efficiency, greatly extends its service life, greatly reduces the water resource consumption of the deodorization process, and does not produce any treatment by-products, thereby reducing the wastewater treatment volume of the pig farm, achieving an integrated, zero-emission effect, and reducing the operating costs of the deodorization process.

[0077] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A low-cost and high-efficiency pig farm microbial deodorization system, comprising a deodorizing wet curtain and a deodorizing nozzle installed at the pig farm fan outlet, wherein the deodorizing nozzle can spray deodorizing water onto the deodorizing wet curtain, characterized in that: Also includes: The deodorizing water collection system comprises a circulating water pool and a water isolation net. The circulating water pool is arranged below the deodorizing nozzle and the deodorizing wet curtain to collect the deodorizing water. The circulating water pool is connected to the deodorizing nozzle through a circulating pipe. The circulating pipe is provided with a flow control water pump to return the deodorized water in the circulating water pool to the deodorizing nozzle for reuse. The water-blocking net is provided above the circulating water pool to filter the deodorized water mist generated by the deodorizing nozzle from the air to the circulating water pool. The suspended matter filtration system comprises a filter filled with river sand; the water inlet of the filter is connected to the circulating water pool, and the deodorized water in the circulating water pool enters the filter to remove suspended matter and large dust particles; the filter is a sealed tank with a water inlet at the bottom and a water outlet at the top. The water treatment system comprises a reactor filled with granular activated carbon, the surface of which is adsorbed with microbial cells, which form a biofilm on the surface of the granular activated carbon; the water inlet of the reactor is connected to the water outlet of the filter, and the water outlet of the reactor is connected to the circulating water pool; the deodorized water treated by the filter enters the reactor, undergoes physical-biochemical reactions to remove organic matter and ammonia nitrogen, and then returns to the circulating water pool for reuse; The reactor uses deodorized water that has been circulated for 5 to 10 days for biofilm formation; During the biofilm formation period, water was added for 4 hours every day, and the dissolved oxygen concentration was controlled between 2 and 4 mg / L. After one week, the water treatment system began to operate continuously.

2. The low-consumption and high-efficiency pig farm microbial deodorization system according to claim 1 is characterized in that: A flow control water pump is provided at the bottom of the circulating water pool, and the flow control water pump is connected to the water inlet of the filter, and water inlet and outlet of the filter are achieved through the flow control water pump.

3. The low-consumption and high-efficiency pig farm microbial deodorization system according to claim 1 is characterized in that: The top of the reactor is open, and an aeration plate is arranged at the bottom. The aeration plate is connected to an aeration pump.

4. The low-consumption and high-efficiency pig farm microbial deodorization system according to claim 3 is characterized in that: The bottom of the reactor is provided with a water inlet, and the top is provided with a water outlet. The height of the water outlet of the reactor is higher than the height of the circulating water pool, so that the deodorized water treated by the reactor can flow back to the circulating water pool by itself.

5. A low-cost and high-efficiency pig farm microbial deodorization method, characterized in that: The deodorized water is recycled by the low-consumption and high-efficiency pig farm microbial deodorization system according to any one of claims 1 to 4, comprising the following steps: Step S1. Filling the filter with river sand; filling the reactor with granular activated carbon, and subjecting the reactor to biofilm formation, so that microbial cells form a biofilm on the surface of the granular activated carbon; Step S2. The deodorizing nozzle sprays deodorizing water onto the deodorizing wet curtain. When the odor passes through the deodorizing wet curtain, the dust, ammonia, and volatile organic matter in the odor are dissolved into the deodorizing water. The odor is washed and discharged, and the deodorizing water flows into the circulating water pool below. Step S3. The deodorized water in the circulating pool enters the filter through a flow-controlled water pump, is filtered through river sand to remove suspended solids and large dust particles, and then discharged from the filter; Step S4. The bottom of the reactor is aerated, and deodorized water, after being treated by the filter, enters the bottom of the reactor. Organic matter in the deodorized water is physically adsorbed on the surface of the activated carbon and undergoes a biochemical reaction with the microbial cells on the surface of the activated carbon, removing organic matter and ammonia nitrogen. The water then flows from above into the circulating water tank. Step S5. The deodorized water in the circulating water pool enters the deodorizing nozzle through a flow-controlled water pump, thereby realizing the recycling of the deodorized water.

6. The low-cost and high-efficiency pig farm microbial deodorization method according to claim 5, characterized in that: In step S4, when the reactor is running, the dissolved oxygen concentration is controlled between 1 and 5 mg / L. When the dissolved oxygen is lower than 1 mg / L, the aeration pump is turned on.

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