Ammonia treatment system and treatment method

Abstract

The present application provides an ammonia treatment system and a treatment method, which belong to the field of wastewater purification, wherein the ammonia treatment system includes a sedimentation tank, an adjusting tank and a sealing unit, the sedimentation tank is used to precipitate wastewater through ammonia water; the adjusting tank is used to store wastewater; the sealing unit encloses the sedimentation tank and the adjusting tank, an air outlet cavity is formed between the sealing unit and the sedimentation tank, and a recovery cavity is formed between the sealing unit and the adjusting tank, and the recovery cavity is connected to the air outlet cavity. The present application realizes unpowered automatic purification of the ammonia generated in the sedimentation tank by automatically passing the ammonia generated in the sedimentation tank into the adjusting tank, and the wastewater in the adjusting tank absorbs the ammonia generated in the sedimentation tank, thereby reducing the treatment cost of ammonia in the production process of iron phosphate.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater purification, and in particular to an ammonia treatment system and a treatment method. Background Art

[0002] The wastewater from ferric phosphate production is mainly inorganic wastewater with high ammonia nitrogen, high salt and low pH. According to the characteristics of the wastewater from ferric phosphate production, the wastewater can be divided into two categories. The first category is cleaning water, which has a low metal ion content; the second category is mother liquor, which has a high metal ion content.

[0003] The existing method mainly separates the primary pretreatment of the washing water and the mother liquor. The pH of the washing water and the mother liquor in the primary pretreatment is controlled at 5.5~6. After the primary treatment, the washing water is concentrated by membrane to make the salt content of the concentrated liquid equivalent to that of the mother liquor. After concentration, it is combined with the primary pretreatment water of the mother liquor for secondary pretreatment. In the secondary pretreatment process, a large amount of ammonia water is required to control the pH of the wastewater at 8.5~9. In this process, the metal impurities and phosphorus elements in the iron phosphate wastewater react with ammonia nitrogen to form phosphate precipitation, and the hydrolysis of ammonia water will produce a large amount of ammonia gas.

[0004] Traditional ammonia treatment generally uses the absorption method, that is, ammonia is introduced into dilute sulfuric acid through a fan, the ammonia is absorbed and solidified by the dilute sulfuric acid to form ammonium sulfate, and then the liquid ammonium sulfate is evaporated and crystallized to form compound fertilizer. Although it has certain economic value, it requires the configuration of a large amount of dilute sulfuric acid, resulting in a high cost for ammonia treatment. Summary of the invention

[0005] In view of the technical problems existing in the background technology, the present application provides an ammonia treatment system and a treatment method, which can absorb ammonia through a regulating tank and effectively reduce the treatment cost of ammonia.

[0006] In a first aspect, an embodiment of the present application provides an ammonia treatment system, the ammonia treatment system comprising:

[0007] Sedimentation tanks, used to precipitate wastewater through ammonia;

[0008] Regulating tanks, used to store wastewater;

[0009] A sealing unit is enclosed in the sedimentation tank and the regulating tank, an air outlet cavity is formed between the sealing unit and the sedimentation tank, and a recovery cavity is formed between the sealing unit and the regulating tank, and the recovery cavity is communicated with the air outlet cavity.

[0010] In the technical solution of the embodiment of the present application, an air outlet cavity is formed by enclosing a sealing unit and a sedimentation tank, and a recovery cavity connected to the air outlet cavity is formed between the sealing unit and the regulating tank, so that the ammonia generated in the sedimentation tank can enter the recovery cavity. After the ammonia enters the recovery cavity, it can react with the wastewater stored in the regulating tank and be absorbed by the wastewater in the regulating tank, thereby purifying the ammonia generated in the sedimentation tank and achieving the technical effect of reducing the treatment cost of ammonia in the production process of iron phosphate.

[0011] In some embodiments, the ammonia treatment system further includes a gas pressure balancing unit, which is disposed in the regulating tank and / or the sedimentation tank and is connected to the atmosphere, and is used to balance the gas pressure in the gas outlet chamber and the recovery chamber.

[0012] In this embodiment, by setting up the air pressure balancing unit, the internal and external air pressures of the air outlet chamber and the recovery chamber can be effectively balanced, preventing the air pressures of the air outlet chamber and the recovery chamber from being too high or too low, thereby achieving the technical effect of preventing damage to the structure of the sealing unit.

[0013] In some embodiments, the air pressure balance unit includes an air pressure balance port, which is disposed in the regulating tank and communicated with the recovery chamber.

[0014] In this embodiment, by setting the air pressure balance port, while balancing the air pressure inside and outside the air outlet cavity and the recovery cavity, it prevents ammonia from being discharged directly without passing through the regulating tank, protects the sealing unit structure, and achieves the technical effect of improving the purification rate of ammonia.

[0015] In some embodiments, the ammonia treatment system further comprises a water seal weir, which is fixed to the regulating tank and located at the lower side of the gas pressure balance port.

[0016] In this embodiment, by setting the water seal weir, the gas discharged from the air pressure balance port must be purified by the wastewater in the water seal weir before being discharged, thereby achieving the technical effect of improving the purification rate of ammonia.

[0017] In some embodiments, the ammonia treatment system also includes a retaining wall, which is fixed to the side wall of the regulating tank and located above the water seal weir. The air pressure balance port is formed between the retaining wall and the side wall of the regulating tank, and the lower end of the retaining wall extends toward the direction of the water seal weir.

[0018] In this embodiment, the gas is blocked by the retaining wall so that the gas leading to the gas pressure balance port must be purified by the wastewater in the water seal weir, thereby achieving the technical effect of improving the purification rate of ammonia.

[0019] In some embodiments, the regulating tank is located on one side of the sedimentation tank and is attached to the sedimentation tank, and the sealing unit includes a sealing cover, the top of the sealing cover is sealed, and the bottom sides of the sealing cover are respectively covered on the sedimentation tank and the regulating tank.

[0020] In this embodiment, the technical effect of reducing the construction cost of the ammonia treatment system is achieved by fitting the regulating tank and the sedimentation tank together and providing a sealing cover.

[0021] In some embodiments, the top of the sealing cover is a conical structure.

[0022] In this embodiment, by setting the conical structure of the sealing cover, it is possible to provide guidance for the ammonia gas from the gas outlet chamber to enter the recovery chamber, thereby achieving the technical effect of improving the ammonia gas purification speed.

[0023] In some embodiments, the ammonia treatment system also includes two circulation fans, one of which is arranged in the air outlet chamber for blowing the gas in the air outlet chamber toward the recovery chamber, and the other circulation fan is located in the recovery chamber for blowing the gas in the recovery chamber toward the regulating tank.

[0024] In this embodiment, by setting up two circulating fans, the ammonia formed in the sedimentation tank can be easily introduced into the regulating tank, thereby achieving the technical effect of improving the ammonia purification efficiency.

[0025] In some embodiments, the two circulation fans are staggered.

[0026] In this embodiment, by staggering the two circulation fans, it is possible to prevent the circulation fan located in the air outlet chamber from blowing the gas directly toward the circulation fan located in the recovery chamber, thereby increasing the air intake range of the circulation fan located in the recovery chamber and achieving the technical effect of improving the ammonia purification efficiency.

[0027] In a second aspect, an embodiment of the present application provides an ammonia treatment method, which is performed by the ammonia treatment system, comprising:

[0028] Ammonia gas formed in the sedimentation tank enters the recovery chamber;

[0029] Ammonia gas enters the gas outlet chamber through the recovery chamber;

[0030] The ammonia in the outlet cavity reacts with the wastewater in the equalization tank and is absorbed by the equalization tank.

[0031] In the technical solution of the embodiment of the present application, the ammonia generated in the sedimentation tank is automatically passed into the regulating tank and absorbed by the wastewater in the regulating tank, thereby achieving the purification of the ammonia generated in the sedimentation tank and achieving the technical effect of reducing the treatment cost of ammonia in the production process of iron phosphate.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 is a top view of an ammonia treatment system in an embodiment of the present application;

[0035] Figure 2 for Figure 1 Sectional view along line AA;

[0036] Figure 3 for Figure 1 Sectional view along line BB;

[0037] Figure 4 for Figure 1 Sectional view along CC line;

[0038] Figure 5 Flow chart of the ammonia treatment method in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 10—Sedimentation tank 11—Isolation wall 12—Outlet weir

[0041] 13—Filter wall 20—Regulating tank 30—Sealing unit

[0042] 31 - air outlet cavity 32 - recovery cavity 33 - sealing cover

[0043] 40—air pressure balance unit 41—air pressure balance port 50—water seal weir

[0044] 60—retaining wall 70—circulating fan 111—water inlet

[0045] 131—Oblique tube. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0052] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] After the wastewater from ferrous phosphate production is pretreated once and the pH value is controlled at 5.5-6, it is necessary to perform a secondary pretreatment on the wastewater after the primary pretreatment. During the secondary pretreatment of the wastewater from ferrous phosphate production, a large amount of ammonia water is required to control the pH value of the wastewater at 8.5-9. In this process, the metal impurities and phosphorus elements in the ferrous phosphate wastewater react with ammonia nitrogen to form phosphate salt precipitation, in which the hydrolysis of ammonia water will produce a large amount of ammonia gas, which needs to be purified. Traditional ammonia treatment generally uses the absorption method, that is, by introducing ammonia into dilute sulfuric acid, and then absorbing and solidifying the ammonia with dilute sulfuric acid, so that the purification process of ammonia consumes a large amount of dilute sulfuric acid, resulting in a high ammonia treatment cost.

[0055] In order to solve the technical problem of high treatment cost of ammonia in the production process of iron phosphate, the embodiment of the present application provides an ammonia treatment system and treatment method, wherein the ammonia generated in the sedimentation tank 10 for secondary pretreatment is automatically introduced into the regulating tank 20 and absorbed by the wastewater in the regulating tank 20, thereby achieving the technical effect of reducing the treatment cost of ammonia in the production process of iron phosphate.

[0056] See also Figures 1 to 4 According to one or more embodiments of the present application, the ammonia treatment system provided by the embodiment of the present application includes a sedimentation tank 10, a regulating tank 20 and a sealing unit 30. The sedimentation tank 10 is used to precipitate wastewater through ammonia water; the regulating tank 20 is used to store wastewater; the sealing unit 30 is enclosed in the sedimentation tank 10 and the regulating tank 20, and an air outlet cavity 31 is formed between the sealing unit 30 and the sedimentation tank 10, and a recovery cavity 32 is formed between the sealing unit 30 and the regulating tank 20, and the recovery cavity 32 is connected to the air outlet cavity 31.

[0057] In the technical scheme of the embodiment of the present application, the wastewater from the production of iron phosphate is pretreated once to control the pH value at 5.5-6, and then the wastewater after the primary pretreatment is subjected to secondary pretreatment, the wastewater to be subjected to secondary pretreatment is passed into the sedimentation tank 10, and then ammonia water is added to the sedimentation tank 10, the ammonia water adjusts the pH value of the wastewater, and the metal impurities and phosphorus elements in the wastewater are reacted by ammonia nitrogen to form phosphate precipitates, wherein the hydrolysis of ammonia water continuously produces a large amount of ammonia gas and enters the gas outlet chamber 31, and the ammonia gas continuously diffuses and migrates to the recovery chamber 32 through the ammonia concentration difference between the gas outlet chamber 31 and the recovery chamber 32, and the ammonia gas migrated to the recovery chamber 32 reacts NH3+H when it contacts the acidic wastewater in the regulating tank 20 + =NH4 + After the ammonia in the recovery chamber 32 is absorbed, the ammonia concentration decreases, and it continues to provide power for the diffusion of ammonia. This cycle is repeated to purify the ammonia generated in the sedimentation tank 10, achieve unpowered automatic deodorization, and reduce the cost of ammonia treatment in the production process of iron phosphate.

[0058] It can be understood that the sedimentation tank 10 can be one or more arbitrary tank structures that can provide a sedimentation reaction for the wastewater subjected to primary pretreatment.

[0059] See also Figure 1 to Figure 2 Furthermore, in the embodiment of the present application, a separation wall 11 and an outlet weir 12 are provided inside the sedimentation tank 10. The separation wall 11 extends toward the bottom of the sedimentation tank 10 and forms a water inlet 111 with the inner wall of the sedimentation tank 10. The outlet weir 12 is opposite to the separation wall 11, and the top height of the outlet weir 12 is lower than the top height of the separation wall 11.

[0060] In this embodiment, the wastewater and ammonia water that have been pretreated once are introduced into the bottom of the sedimentation tank 10 through the water inlet 111. After the reaction occurs at the bottom of the sedimentation tank 10, the generated phosphate salts are precipitated at the bottom of the sedimentation tank 10, and the clean water floats up and overflows to the outlet weir 12 and is discharged from the outlet weir 12. Since the top height of the outlet weir 12 is lower than the top height of the isolation wall 11, the wastewater and the purified clean water can be effectively isolated, and the wastewater located at the upper layer of the water inlet 111 can be prevented from entering the clean water and entering the outlet weir 12 together with the clean water.

[0061] See also Figure 2 and Figure 4 Furthermore, in the embodiment of the present application, a filter wall 13 is also provided inside the sedimentation tank 10. The filter wall 13 is located at the lower side of the outlet weir 12 and extends to the isolation wall 11. The filter wall 13 is provided with a plurality of inclined pipes 131 penetrating the upper and lower sides of the filter wall 13.

[0062] In this embodiment, the filter wall 13 can prevent the sediment from floating up, and the inclined tube 131 can allow clean water and ammonia generated during the reaction to pass through.

[0063] Furthermore, in the embodiment of the present application, the function of the regulating tank 20 is to temporarily store the cleaning water or mother liquor that the subsequent process cannot process in time when the incoming water volume is large. When there is no incoming water, it can also be used to temporarily store the wastewater generated by the subsequent process.

[0064] It can be understood that the regulating tank 20 can be enclosed on the outside of one or more sedimentation tanks 10 through an annular structure, or be arranged on the inside of one or more sedimentation tanks 10, or be arranged adjacent to one or more sedimentation tanks 10. When the regulating tank 20 is enclosed on the outside of one or more sedimentation tanks 10, the sealing unit 30 only needs to be covered on the regulating tank 20 to form an enclosure for the regulating tank 20 and the sedimentation tank 10; when the regulating tank 20 is arranged on the inside of one or more sedimentation tanks 10, the sealing unit 30 only needs to be covered on the sedimentation tank 10 to form an enclosure for the regulating tank 20 and the sedimentation tank 10; when the regulating tank 20 is arranged adjacent to one or more sedimentation tanks 10, the sealing unit 30 can be covered on the sedimentation tank 10 and the regulating tank 20 at the same time to form an enclosure for the regulating tank 20 and the sedimentation tank 10.

[0065] It can be understood that when the regulating tank 20 is enclosed on the outside of one or more sedimentation tanks 10 or the regulating tank 20 is arranged on the inside of one or more sedimentation tanks 10, the sealing unit 30 can be any cover structure arranged on the sedimentation tank 10 or the regulating tank 20. When the regulating tank 20 is arranged adjacent to one or more sedimentation tanks 10, the sealing unit 30 can be a connecting pipe whose two ends are respectively connected to the sedimentation tank 10 and the regulating tank 20.

[0066] See also Figure 1 and Figure 4 Furthermore, in the embodiment of the present application, the regulating tank 20 is located on one side of the sedimentation tank 10 and is attached to the sedimentation tank 10, and the sealing unit 30 includes a sealing cover 33, the top of the sealing cover 33 is sealed, and the bottom sides of the sealing cover 33 are respectively covered on the sedimentation tank 10 and the regulating tank 20.

[0067] In this embodiment, the regulating tank 20 can seal the gap between the regulating tank 20 and the sedimentation tank 10 by fitting with the sedimentation tank 10, so that only the sealing unit 30 needs to be set to cover the sedimentation tank 10 and the regulating tank 20 on both sides of the bottom respectively, so that the gas outlet cavity 31 and the recovery cavity 32 structures that are interconnected and sealed can be formed, and there is no need to set up an additional sealing structure to seal the gap between the regulating tank 20 and the sedimentation tank 10. Therefore, through the fitting of the regulating tank 20 and the sedimentation tank 10 and the setting of the sealing cover 33, the construction cost of the ammonia treatment system can be effectively reduced.

[0068] Furthermore, in the embodiment of the present application, the sealing cover 33 is an inverted hanging film.

[0069] It is understandable that the sealing cover 33 can be any structure such as a square structure or a hemispherical structure that can simultaneously enclose the sedimentation tank 10 and the regulating tank 20 .

[0070] See also Figures 2 to 4 Furthermore, in the embodiment of the present application, the top of the sealing cover 33 is a conical structure.

[0071] In this embodiment, the conical structure of the sealing cover 33 can provide guidance for the ammonia gas from the gas outlet cavity 31 to enter the recovery cavity 32, thereby improving the purification speed of the ammonia gas.

[0072] See also Figure 1 and Figure 3 Furthermore, in an embodiment of the present application, the ammonia treatment system also includes a gas pressure balancing unit 40, which is disposed in the regulating tank 20 and / or the sedimentation tank 10 and is connected to the atmosphere, and is used to balance the gas pressure in the gas outlet chamber 31 and the recovery chamber 32.

[0073] In this embodiment, through the setting of the air pressure balance unit 40, when the amount of ammonia in the air outlet chamber 31 and the recovery chamber 32 is large and the pressure is too high, the gas in the air outlet chamber 31 and / or the recovery chamber 32 can be discharged through the air pressure balance unit 40. When the gas in the air outlet chamber 31 and the recovery chamber 32 is absorbed by the sedimentation tank 10 and the regulating tank 20 and the air pressure is too low, the external gas can enter the air outlet chamber 31 and / or the recovery chamber 32 through the air pressure balance unit 40, thereby increasing the internal air pressure of the air outlet chamber 31 and / or the recovery chamber 32. Therefore, the internal and external air pressures of the air outlet chamber 31 and the recovery chamber 32 can be effectively balanced, preventing the air pressure of the air outlet chamber 31 and the recovery chamber 32 from being too high or too low, and preventing the internal and external pressure difference from damaging the structure of the sealing unit 30, resulting in poor sealing of the sealing unit 30 and causing ammonia leakage.

[0074] It can be understood that the air pressure balancing unit 40 can be any structure such as a fan, an air pipe, an air hole, etc. that can balance the air pressure inside and outside the air outlet cavity 31 and the recovery cavity 32.

[0075] It can be understood that the air pressure balance unit 40 can be set in the regulating tank 20 and connected to the recovery chamber 32, or set in the sedimentation tank 10 and connected to the air outlet chamber 31, or set in the regulating tank 20 and the sedimentation tank 10 at the same time, and connected to both the recovery chamber 32 and the air outlet chamber 31.

[0076] See also Figure 1 and Figure 3 Furthermore, in the embodiment of the present application, the air pressure balance unit 40 includes an air pressure balance port 41 , which is disposed in the regulating tank 20 and communicated with the recovery chamber 32 .

[0077] In this embodiment, the gas in the recovery chamber 32 enters or exits through the air pressure balance port 41, thereby balancing the internal and external air pressures of the recovery chamber 32. Since the recovery chamber 32 is connected to the air outlet chamber 31, the internal and external air pressures of the air outlet chamber 31 can be kept balanced. By setting the air pressure balance port 41, while balancing the internal and external air pressures of the air outlet chamber 31 and the recovery chamber 32, it is prevented that ammonia is directly discharged without flowing through the regulating tank 20, thereby protecting the structure of the sealing unit 30 and improving the purification rate of ammonia.

[0078] See also Figure 1 and Figure 3 Furthermore, in the embodiment of the present application, the ammonia treatment system also includes a water seal weir 50, which is fixed to the regulating tank 20 and located at the lower side of the air pressure balance port 41.

[0079] In this embodiment, the air pressure balance port 41 can be used as a vent for balancing the air pressure inside and outside the recovery chamber 32, and can also be used as a wastewater inlet for introducing wastewater into the regulating tank 20. Since the water seal weir 50 is located at the lower side of the air pressure balance port 41, the gas discharged from the recovery chamber 32 must pass through the wastewater in the water seal weir 50. Through the setting of the water seal weir 50, the air pressure in the recovery chamber 32 is Pi, and the external air pressure is Po. When the pressure Pi in the recovery chamber 32 is greater than the external air pressure Po, the gas in the recovery chamber 32 passes over the water seal weir 50. When contacting the water seal weir 50, the ammonia in the gas will be neutralized by the acidic wastewater in the water seal weir 50, and NH3+H + =NH4 + The reaction makes the gas discharged into the atmosphere contain no ammonia, thereby improving the purification rate of ammonia and realizing unpowered deodorization and ammonia recovery; when ammonia is absorbed by the acidic wastewater, so that the pressure Pi in the recovery chamber 32 is less than the external air pressure Po, the external air will pass over the water seal weir 50 and enter the recovery chamber 32, thereby achieving pressure balance inside and outside the membrane.

[0080] Furthermore, in the embodiment of the present application, in order to prevent the water seal weir 50 from being blocked by sedimentation, the wastewater introduced into the water seal weir 50 is mainly cleaning water.

[0081] See also Figure 1 and Figure 3 Furthermore, in an embodiment of the present application, the ammonia treatment system also includes a retaining wall 60, which is fixed to the side wall of the regulating tank 20 and is located above the water seal weir 50. An air pressure balance port 41 is formed between the retaining wall 60 and the side wall of the regulating tank 20, and the lower end of the retaining wall 60 extends toward the direction of the water seal weir 50.

[0082] In this embodiment, the gas in the recovery chamber 32 will be blocked by the retaining wall 60 during the flow toward the air pressure balance port 41, and the gas will diffuse toward the water seal weir 50 under the guidance of the retaining wall 60. The blocking of the gas by the retaining wall 60 makes the gas leading to the air pressure balance port 41 must be purified by the wastewater of the water seal weir 50, thereby improving the purification rate of ammonia while balancing the air pressure inside and outside the recovery chamber 32.

[0083] In this embodiment, through the cooperation of the retaining wall 60 and the water seal weir 50, a pressure difference of ±0.5 KPa is allowed to exist between the inside and outside of the recovery chamber 32. When the pressure difference between the inside and outside of the recovery chamber 32 exceeds 0.5 KPa, the gas will cross the water seal weir 50 and enter the recovery chamber 32 or pass out of the recovery chamber 32.

[0084] See also Figure 3 Furthermore, in the embodiment of the present application, the sealing cover 33 is installed on the retaining wall 60 on one side close to the retaining wall 60 .

[0085] See also Figures 1 to 3 Furthermore, in the embodiment of the present application, the ammonia treatment system also includes two circulation fans 70, one of which is arranged in the air outlet chamber 31 to blow the gas in the air outlet chamber 31 toward the recovery chamber 32, and the other circulation fan 70 is located in the recovery chamber 32 to blow the gas in the recovery chamber 32 toward the regulating tank 20.

[0086] In this embodiment, by providing two circulating fans 70 , the flow of ammonia gas formed in the sedimentation tank 10 into the regulating tank 20 can be accelerated, thereby improving the purification efficiency of ammonia gas.

[0087] See also Figures 1 to 3 Furthermore, in the embodiment of the present application, the two circulation fans 70 are staggered.

[0088] In this embodiment, by staggering the two circulation fans 70, it is possible to avoid the circulation fan 70 located in the air outlet chamber 31 from blowing the gas directly toward the circulation fan 70 located in the recovery chamber 32, thereby increasing the air intake range of the circulation fan 70 located in the recovery chamber 32 and improving the ammonia purification efficiency.

[0089] Please also read Figure 5 According to one or more embodiments of the present application, the ammonia treatment method provided in the embodiments of the present application is performed by an ammonia treatment system, including:

[0090] Ammonia gas formed in the sedimentation tank 10 enters the recovery chamber 32;

[0091] Ammonia gas enters the gas outlet chamber 31 through the recovery chamber 32;

[0092] The ammonia gas in the gas outlet cavity 31 reacts with the wastewater in the regulating tank 20 and is absorbed by the regulating tank 20 .

[0093] In the technical solution of the embodiment of the present application, the ammonia generated in the sedimentation tank 10 is automatically introduced into the regulating tank 20, and the wastewater in the regulating tank 20 absorbs the ammonia generated in the sedimentation tank 10 through the above process flow, thereby realizing the unpowered recovery of the ammonia generated in the sedimentation tank 10, and effectively reducing the treatment cost of ammonia in the production process of iron phosphate.

[0094] Furthermore, in the embodiment of the present application, when the pressure in the recovery chamber 32 is greater than the external air pressure, the gas in the recovery chamber 32 passes over the water seal weir 50 and is discharged from the air pressure balance port 41; when the pressure in the recovery chamber 32 is less than the external air pressure, the external air passes over the water seal weir 50 and enters the recovery chamber 32.

[0095] In this embodiment, when contacting the water seal weir 50, the ammonia in the gas will be neutralized by the acidic wastewater in the water seal weir 50 to produce NH3+H + =NH4 + The reaction can make the gas discharged into the atmosphere contain no ammonia, thereby improving the purification rate of ammonia and realizing unpowered deodorization and ammonia recovery; when the pressure in the recovery chamber 32 is lower than the external air pressure, the external air will pass over the water seal weir 50 and enter the recovery chamber 32, thereby achieving pressure balance inside and outside the membrane.

[0096] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. An ammonia treatment system for recovering ammonia generated in the treatment of ferric phosphate production wastewater, characterized in that: include: Sedimentation tanks, used to precipitate wastewater through ammonia; Regulating tanks, used to store wastewater; A sealing unit is enclosed in the sedimentation tank and the regulating tank, an air outlet cavity is formed between the sealing unit and the sedimentation tank, and a recovery cavity is formed between the sealing unit and the regulating tank, and the recovery cavity is communicated with the air outlet cavity; The regulating tank is located on one side of the sedimentation tank and is attached to the sedimentation tank. The sealing unit includes a sealing cover, the top of the sealing cover is sealed, and the bottom of the sealing cover is respectively covered on the sedimentation tank and the regulating tank on both sides; An air pressure balancing unit, which is arranged in the regulating tank and communicated with the atmosphere, and is used to balance the air pressure of the air outlet cavity and the recovery cavity. The air pressure balancing unit includes an air pressure balancing port, which is arranged in the regulating tank and communicated with the recovery cavity, and also includes a water seal weir, which is fixed to the regulating tank and located at the lower side of the air pressure balancing port; A retaining wall is fixed to the side wall of the regulating tank and is located above the water seal weir. The air pressure balance port is formed between the retaining wall and the side wall of the regulating tank. The lower end of the retaining wall extends toward the water seal weir.

2. The ammonia treatment system according to claim 1, characterized in that: The top of the sealing cover is a conical structure.

3. The ammonia treatment system according to any one of claims 1 to 2, characterized in that: The ammonia treatment system also includes two circulation fans, one of which is arranged in the air outlet chamber for blowing the gas in the air outlet chamber toward the recovery chamber, and the other circulation fan is located in the recovery chamber for blowing the gas in the recovery chamber toward the regulating tank.

4. The ammonia treatment system according to claim 3, characterized in that: The two circulation fans are arranged in a staggered manner.

5. A method for treating ammonia, characterized in that: The method is performed by the ammonia treatment system according to any one of claims 1 to 4, comprising: Ammonia gas formed in the sedimentation tank enters the recovery chamber; Ammonia gas enters the gas outlet chamber through the recovery chamber; The ammonia in the outlet cavity reacts with the wastewater in the equalization tank and is absorbed by the equalization tank.

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