High-concentration ammonia-nitrogen wastewater treatment device and method

Abstract

The application discloses a high-concentration ammonia-nitrogen wastewater treatment device, which comprises a blow-off tower and an absorption tower, an aeration pipe is arranged in the blow-off tower, and the exhaust end of the blow-off tower is communicated with the air inlet end of the absorption tower through a pipeline; the absorption tower is internally provided with ammonia-nitrogen recovery liquid, and a plurality of passing cavities for waste gas passing through are arranged in the middle of the absorption tower; a spraying pipe capable of moving up and down and rotating is arranged in each passing cavity; a plurality of discharge cavities for discharging ammonia gas are arranged at the upper end of the absorption tower; a separation net plate is arranged at the outlet of each discharge cavity; an absorption net for absorbing water in passing airflow is arranged at the bottom of each separation net plate; and a squeezing plate capable of moving up and down and squeezing water in the absorption net is arranged below each discharge cavity. The ammonia-nitrogen blow-off method has the advantages of simple process, stable treatment effect, low investment and low operation cost; the application overcomes the defects of the prior art, has reasonable design, compact structure, high social use value and application prospect, and is worth promoting.

Description

TECHNICAL FIELD

[0001] The present application relates to the chemical technology field, especially to a high-concentration ammonia-nitrogen wastewater treatment device and method. BACKGROUND

[0002] The currently known ammonia-nitrogen wastewater treatment methods can be generally divided into physical-chemical denitrification, biological denitrification and advanced oxidation method. For high-concentration ammonia-nitrogen wastewater, the physical-chemical denitrification is usually adopted for pretreatment, so as to reduce the ammonia-nitrogen to a lower concentration and then perform biochemical treatment. The traditional physical-chemical method can be divided into chemical neutralization, chemical precipitation, emulsion liquid membrane separation, air stripping and steam stripping, breakpoint chlorination, ion exchange, supergravity denitrification and other methods. However, these treatment methods all have problems of large investment in treatment equipment, low denitrification efficiency, high treatment cost,

[0003] When ammonia-nitrogen stripping is performed, the gas containing ammonia after stripping needs to be sprayed for recovery, and the ammonia in the gas is recovered and then discharged. However, the existing ammonia recovery device has a too large gas flow passing area, and the spray pipe is sprayed, so that the absorption liquid is unevenly distributed, the overall gas-liquid contact probability is low, the ammonia recovery efficiency is low, the discharged gas is difficult to meet the discharge standard, and the liquid content in the discharged gas flow is high, so that the spray liquid is seriously lost and the cost is increased.

[0004] Therefore, in view of the above problems, the present application provides a high-concentration ammonia-nitrogen wastewater treatment method and device based on the experience in design, development and actual production in the related industry for many years, so as to achieve the purpose of having more practical value. SUMMARY

[0005] In order to solve the above-mentioned problems in the background art, the present application provides a high-concentration ammonia-nitrogen wastewater treatment method and device.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The utility model provides a kind of high concentration ammonia nitrogen wastewater treatment device, including blow-off tower and absorption tower, aeration pipe is equipped in the blow-off tower, and blow-off tower exhaust end is communicated with the air inlet end of absorption tower by pipeline, ammonia recovery liquid is stored in the inside of absorption tower, and multiple pass-through cavities for waste gas are equipped in the middle of absorption tower, the inside of pass-through cavity is equipped with the spray pipe for ammonia recovery liquid spray, the spray pipe can be up and down movement and rotatably arranged in pass-through cavity, the upper end of absorption tower is equipped with multiple discharge cavities for ammonia gas discharge, the outlet of discharge cavity is equipped with separation net board, the bottom of separation net board is equipped with absorption net for absorbing moisture in airflow, the lower of discharge cavity is equipped with extrusion plate that can be up and down movement and extruding moisture in absorption net.

[0008] Preferably, the middle of the pass-through cavity is provided with an adjusting ring plate that is fixedly connected, the spray pipe is slidably connected in the adjusting ring plate, the spray pipe is provided with a plurality of spray holes for spraying ammonia recovery liquid, the liquid direction of the spray holes is inclined to spray in the same direction, the middle of the spray pipe is provided with a reciprocating thread, and the upper end of the adjusting ring plate is matched and connected with the reciprocating thread.

[0009] Preferably, the spray holes include first holes and second holes, which are respectively arranged at the upper and lower ends of the adjusting ring plate.

[0010] Preferably, the spray pipes are different in height at the positions of the corresponding adjusting ring plates, the upper ends of the spray pipes are fixedly connected with driving rods, and the upper ends of the driving rods are fixedly connected with the corresponding extrusion plates.

[0011] Preferably, the absorption tower is provided with a circulating pump on one side, the circulating pump is provided with a water inlet pipe for pumping ammonia recovery liquid at one end, and the output end of the circulating pump is provided with a drain pipe, which is communicated with the spray pipe.

[0012] Preferably, the inner wall of the adjusting ring plate is provided with a ring-shaped flow guide ring groove, the side wall of the spray pipe is provided with a water inlet hole communicated with the flow guide ring groove, the outer side of the adjusting ring plate is provided with a plurality of fixed rods fixedly connected, the fixed rods are fixedly connected with the inner wall of the pass-through cavity, the middle of the fixed rods is provided with a flow guide groove communicated with the flow guide ring groove, and the drain pipe is communicated with the flow guide groove.

[0013] Preferably, the outer side of the absorption tower is provided with a fixedly connected and ring-shaped flow guide frame, the drain pipe is communicated with one side of the flow guide frame, the side wall of the absorption tower is provided with a plurality of communication grooves communicated with the flow guide frame, the outer side of each pass-through cavity is provided with a ring-shaped drainage ring groove, the drainage ring grooves are respectively communicated with the corresponding flow guide grooves, and the drainage ring grooves and the communication grooves are communicated with drainage grooves.

[0014] Preferably, the water inlet hole is located below the reciprocating thread, the height of the guide ring groove is greater than the up-down movement distance of the water inlet hole in the guide ring groove, the middle part of the spray pipe is in sliding and sealing connection with the bottom of the adjusting ring plate, the upper end of the adjusting ring plate is provided with a telescopic sealing pipe for connecting sealing, and the extension end of the sealing pipe is in rotating and sealing connection with the corresponding spray pipe.

[0015] Preferably, the gas inlet end of the absorption tower is provided with a gas inlet fan, one end of the gas inlet fan is communicated with the gas exhaust end of the stripping tower through a pipeline, and the other end of the gas inlet fan is communicated with the gas inlet end of the absorption tower through a pipeline.

[0016] A high-concentration ammonia-nitrogen wastewater treatment method, comprising the following steps:

[0017] S1: adding high-concentration ammonia-nitrogen sewage into sodium hydroxide for pH adjustment, so that the pH value is 11-13, wherein the ammonia-nitrogen concentration in the high-concentration ammonia-nitrogen sewage is 1000 mg / L to 10000 mg / L;

[0018] S2: passing the high-concentration ammonia-nitrogen sewage after pH adjustment into a stripping tower, stripping the high-concentration ammonia-nitrogen sewage through an aeration pipe aeration mode, and obtaining low-concentration ammonia-nitrogen sewage after treatment, wherein the ammonia-nitrogen concentration in the low-concentration ammonia-nitrogen sewage is 1000 mg / L to 3000 mg / L;

[0019] S3: simultaneously starting a gas inlet fan to deliver the gas in the stripping tower into the absorption tower, and starting a circulating pump to spray synchronously through the spray holes on the spray pipes in the cavity, wherein the reaction force generated when the spray holes spray can drive the spray pipes to rotate, and the spray pipes can periodically move up and down in the cavity in cooperation with the characteristics of the reciprocating thread, and the multiple spray pipes in the absorption tower can move up and down in a staggered manner through the transmission of the transmission rod and the different heights of the spray pipes in the adjusting ring plate, so that the squeeze plates can synchronously squeeze or loosen the absorption nets, and the half discharge cavities in the absorption tower can be always kept in an open state to absorb the water in the ammonia gas, and the water in the absorption nets in the half discharge cavities can be squeezed and separated in time by the squeeze plates;

[0020] S4: adding a sodium sulfide solution into the wastewater to generate a precipitate by destroying copper and chromium ammonia complex ions, and then continuing to strip the wastewater;

[0021] S5: controlling the stripping time, so that the ammonia-nitrogen concentration in the sewage is less than 10 mg / L, and then the sewage can be discharged.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] 1. The high concentration ammonia nitrogen wastewater is treated by prolonging the blow-off process time and adding sodium sulfide to destroy the complexation, and the high concentration ammonia nitrogen wastewater is treated into low concentration ammonia nitrogen wastewater. The ammonia nitrogen blow-off method has the advantages of simple process, stable treatment effect, low investment and low operation cost, and is the most widely used method at present. The ammonia gas blown off can be absorbed by hydrochloric acid to generate ammonium chloride which can be used as mother liquor for soda production, or can be absorbed by water to produce ammonia water or by sulfuric acid to produce ammonium sulfate byproduct according to market demand, and the tail gas is returned to the blow-off tower to avoid secondary pollution.

[0024] 2. Through the design of the cavity, the passing area of ammonia gas in the absorption tower can be effectively reduced, the gas is concentrated to pass through multiple passing cavities, and a spraying pipe is arranged in the passing cavity. Such design can make the liquid sprayed by the spraying pipe contact the gas with a higher probability, thereby improving the ammonia gas recovery efficiency. The spraying pipe can rotate and move up and down, which can make the ammonia gas recovery liquid more evenly distributed in the passing cavity, further improving the ammonia gas recovery efficiency. The design of the separation net plate, the absorption net and the extrusion plate can realize the extrusion of the absorption net by the extrusion plate through the up and down movement of the extrusion plate, so that the water absorbed in the absorption net can be extruded and separated in time, ensuring the absorption efficiency of the absorption net and reducing the loss of absorption liquid and cost.

[0025] 3. The design of the spraying hole spraying angle can make the spraying pipe rotate while spraying, thereby effectively improving the contact probability of the liquid with the gas flow during spraying and improving the ammonia gas recovery efficiency. The rotation of the spraying pipe and the combination of the adjusting ring plate and the reciprocating screw can realize the up and down movement of the spraying pipe in the adjusting ring plate by utilizing the characteristics of the reciprocating screw, thereby further improving the distribution area of the liquid during spraying and further improving the ammonia gas recovery efficiency.

[0026] 4. The design of the different heights of the spraying pipes in the adjusting ring plate and the transmission of the transmission rod can make the spraying pipes rotate synchronously during spraying. Since the heights of the spraying pipes are different, the multiple spraying pipes can move up and down alternately. Such design can make the extrusion plate also move up and down alternately, thereby controlling half of the discharge cavities to remain open, and the extrusion plate is extruding the absorption net in the other half of the discharge cavities. Such design can ensure that half of the absorption nets always have good absorption function, thereby ensuring the absorption efficiency of the absorption net for the liquid in the gas flow and reducing the loss of ammonia gas recovery liquid. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, below the accompanying drawings needed to be used in the embodiments or prior art description will be briefly described. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and for ordinary skilled in the art, other drawings can also be obtained without creative effort based on these drawings.

[0028] Figure 1 The process flow diagram of the present application.

[0029] Figure 2 The stereoscopic structure diagram of the stripping tower and the absorption tower of the present application.

[0030] Figure 3 The stereoscopic structure diagram of the through cavity, the spraying pipe and the discharge cavity of the present application.

[0031] Figure 4 The main view internal structure diagram of the through cavity, the spraying pipe and the discharge cavity of the present application.

[0032] Figure 5 The main view cross-sectional structure diagram of the spraying pipe and the adjusting ring plate of the present application.

[0033] Figure 6 The top view cross-sectional structure diagram of the drainage ring groove and the drainage groove of the present application.

[0034] Figure 7 The stereoscopic structure diagram of the spraying pipe and the adjusting ring plate of the present application.

[0035] Figure 8 The stereoscopic structure diagram of the spraying pipe of the present application.

[0036] In the figure: 1, aeration fan; 2, stripping tower; 3, aeration pipe; 4, air inlet fan; 5, waste liquid pipe; 6, circulating pump; 61, drain pipe; 7, absorption tower; 71, discharge pipe; 72, flow guide pipe; 721, second plate; 722, first plate; 7221, drainage groove; 7222, drainage ring groove; 723, through cavity; 73, spraying pipe; 731, adjusting ring plate; 7311, flow guide ring groove; 732, fixed rod; 7321, flow guide groove; 733, first hole; 734, second hole; 735, water inlet hole; 736, sealing pipe; 737, reciprocating thread; 74, transmission rod; 741, extrusion plate; 75, recovery block; 751, discharge cavity; 752, separation net plate; 753, absorption net; 76, communication groove; 8, liquid supplementing pump. DETAILED DESCRIPTION

[0037] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0038] Embodiment 1

[0039] With reference to Figures 1-4 A high-concentration ammonia-nitrogen wastewater treatment device, comprising a stripping tower 2 and an absorption tower 7, the stripping tower 2 is provided with an aeration pipe 3, and the exhaust end of the stripping tower 2 is communicated with the air inlet end of the absorption tower 7 through a pipeline, the absorption tower 7 stores ammonia gas recovery liquid inside, and a plurality of passing cavities 723 for waste gas passing through are arranged in the middle of the absorption tower 7, the passing cavities 723 are each provided with a spraying pipe 73 for spraying ammonia gas recovery liquid, the spraying pipe 73 is movably arranged in the passing cavity 723 and can rotate, the upper end of the absorption tower 7 is provided with a plurality of discharge cavities 751 for discharging ammonia gas, the discharge cavities 751 are each provided with a fixedly connected separation net plate 752 at the outlet, the separation net plate 752 is provided with a connected absorption net 753 at the bottom, which absorbs water in the passing gas flow, and the discharge cavities 751 are each provided with a movable extrusion plate 741 below, which extrudes water in the absorption net 753.

[0040] The design of the passing cavity 723 can effectively reduce the passing area of ammonia gas in the absorption tower 7, so that the gas is concentrated to pass through the plurality of passing cavities 723, and the spraying pipe 73 is arranged in the passing cavity 723, which can make the liquid sprayed by the spraying pipe 73 contact the gas with a higher probability, thereby improving the ammonia gas recovery efficiency, and the design that the spraying pipe 73 can rotate and move up and down can make the ammonia gas recovery liquid more evenly distributed in the passing cavity 723, further improving the ammonia gas recovery efficiency; the design of the separation net plate 752, the absorption net 753 and the extrusion plate 741 can realize the extrusion of the absorption net 753 by the extrusion plate 741 through the up-and-down movement of the extrusion plate 741, so that the water absorbed in the absorption net 753 can be extruded and separated in time, thereby ensuring the absorption efficiency of the absorption net 753.

[0041] As a feasible implementation manner, with reference to Figures 3-4The through cavity 723 is provided with an adjusting ring plate 731 fixedly connected at the middle portion of the through cavity 723, the spray pipe 73 is slidably connected in the adjusting ring plate 731, a plurality of spray holes for spraying the ammonia recovery liquid are arranged on the spray pipe 73, the liquid sprayed by the spray holes is inclined to spray in the same direction, and the middle portion of the spray pipe 73 is provided with a reciprocating thread 737, and the upper end of the adjusting ring plate 731 is matched and connected with the reciprocating thread 737.

[0042] The design of the spray hole spraying angle can make the spray pipe 73 rotate while spraying, thereby effectively improving the contact probability of the liquid with the airflow during spraying, improving the ammonia recovery efficiency, and the rotation of the spray pipe 73 is combined with the adjusting ring plate 731 and the reciprocating thread 737, the characteristics of the reciprocating thread 737 are utilized, the up-down movement of the spray pipe 73 in the adjusting ring plate 731 is realized, the distribution area of the liquid during spraying is further improved, and the ammonia recovery efficiency is further improved.

[0043] In the embodiment, the spray holes include first holes 733 and second holes 734, and the first holes 733 and the second holes 734 are arranged at the upper and lower ends of the adjusting ring plate 731 respectively. The first holes 733 are arranged above the through cavity 723, and the second holes 734 are arranged on the inner wall of the through cavity 723. Such design can first utilize the through cavity 723 to reduce the passing area of the airflow, thereby maximizing the contact probability of the ammonia recovery liquid with the airflow during spraying of the second holes 734, and the design of the first holes 733 can make the ammonia recovery liquid pass through the first holes 733 and the second holes 734 in different spraying modes, thereby further improving the gas-liquid contact probability.

[0044] In the embodiment, the positions of the different spray pipes 73 in the corresponding adjusting ring plates 731 are different in height, the upper ends of the spray pipes 73 are provided with fixedly connected transmission rods 74, and the upper ends of the transmission rods 74 are fixedly connected with the corresponding extrusion plates 741.

[0045] The design of the different heights of the spray pipes 73 in the adjusting ring plates 731 and the transmission of the transmission rods 74 can make the spray pipes 73 rotate synchronously during spraying, and because the heights of the spray pipes 73 are different, the plurality of spray pipes 73 can move up and down alternately, such design can make the extrusion plates 741 also move up and down alternately synchronously, thereby being capable of keeping half of the discharge cavities 751 open, and the extrusion plates 741 are extruding the adsorption nets in the other half of the discharge cavities 751, such design can ensure that half of the adsorption nets always have good adsorption function, thereby ensuring the adsorption efficiency of the adsorption nets on the liquid in the airflow and reducing the loss of the ammonia recovery liquid.

[0046] As a feasible implementation, referring to Figure 1 Figures 5-6 The absorption tower 7 is provided with a circulating pump 6 on one side, one end of the circulating pump 6 is provided with a water inlet pipe for suction of ammonia recovery liquid, and the output end of the circulating pump 6 is provided with a drain pipe 61 which is in communication with the spray pipe 73.

[0047] In the embodiment, the inner wall of the adjusting ring plate 731 is provided with a flow guide ring groove 7311 in the shape of a ring, the side wall of the spray pipe 73 is provided with a water inlet hole 735 in communication with the flow guide ring groove 7311, the outer side of the adjusting ring plate 731 is provided with a plurality of fixedly connected fixing rods 732, the fixing rods 732 are fixedly connected with the inner wall of the cavity 723, and the middle part of the fixing rods 732 is provided with a flow guide groove 7321 in communication with the flow guide ring groove 7311, and the drain pipe 61 is in communication with the flow guide groove 7321.

[0048] In the embodiment, referring to Figure 6 The outer side of the absorption tower 7 is provided with a flow guide frame 77 which is fixedly connected and in the shape of a ring, the drain pipe 61 is in communication with one side of the flow guide frame 77, the side wall of the absorption tower 7 is provided with a plurality of communication grooves 76 in communication with the flow guide frame 77, the outer side of each cavity 723 is provided with a drainage ring groove 7222 in the shape of a ring, the drainage ring groove 7222 is respectively in communication with the corresponding flow guide groove 7321, and the drainage ring groove 7222 and the communication groove 76 are both provided with a drainage groove 7221 in communication.

[0049] The design of the water inlet hole 735, the flow guide ring groove 7311, the flow guide groove 7321, the drain pipe 61, the flow guide frame 77, the communication groove 76, the drainage ring groove 7222 and the drainage groove 7221 can make the ammonia recovery liquid enter the flow guide frame 77 through the drain pipe 61 when being transported by the circulating pump 6, then enter the drainage groove 7221 in the first plate 722 through the communication groove 76, then enter the corresponding drainage ring groove 7222, then enter the flow guide groove 7321 inside the fixing rod 732, then enter the flow guide ring groove 7311 through the flow guide groove 7321, then enter the spray pipe 73 through the water inlet hole 735, and then be sprayed out through the spray hole, thereby ensuring the up-down movement of the spray pipe 73 and realizing the transportation of the ammonia recovery liquid into the spray pipe 73.

[0050] In the embodiment, referring to Figures 7-8 The water inlet hole 735 is located below the reciprocating thread 737, the height of the flow guide ring groove 7311 is greater than the up-down movement distance of the water inlet hole 735 in the flow guide ring groove 7311, the middle part of the spray pipe 73 and the bottom of the adjusting ring plate 731 are in sliding and sealing connection, the upper end of the adjusting ring plate 731 is provided with a sealing pipe 736 which is telescopic and used for connecting sealing, and the extension end of the sealing pipe 736 is in rotating and sealing connection with the corresponding spray pipe 73.​

[0051] The design of the sealing pipe 736 can realize the sealing of the connection between the reciprocating thread 737 and the adjusting ring plate 731, prevent liquid from flowing out, and ensure that the water inlet hole 735 is located in the flow guide ring groove 7311 during the up-down movement of the spray pipe 73, so that the flow guide ring groove 7311 is always in communication with the water inlet hole 735, and the stable transportation of the ammonia recovery liquid as a whole is ensured.

[0052] In the embodiment, the gas inlet end of the absorption tower 7 is provided with an air inlet fan 4, one end of the air inlet fan 4 is communicated with the exhaust end of the stripping tower 2 through a pipeline, and the other end of the air inlet fan 4 is communicated with the gas inlet end of the absorption tower 7 through a pipeline.

[0053] In the embodiment, the first plate 722 and the second plate 721 are fixedly connected in the absorption tower 7 located above the gas inlet end, a plurality of connected flow guide pipes 72 are arranged between the first plate 722 and the second plate 721, the through cavity 723 passes through the corresponding flow guide pipe 72, the recovery block 75 is fixedly connected in the absorption tower 7, the exhaust cavity 751 is arranged in a penetrating mode on the recovery block 75, and the discharge pipe 71 in a long barrel shape and used for waste gas discharge is arranged at the exhaust end of the absorption tower 7.

[0054] In the embodiment, the stripping tower 2 is provided with an aeration fan 1 on one side, the output end of the aeration fan 1 is communicated with the aeration pipe 3 through a pipeline; the absorption tower 7 is provided with a storage tank on one side, the storage tank stores ammonia recovery liquid used for replenishment, a liquid supplementing pump 8 is arranged in the storage tank, the output end of the liquid supplementing pump 8 is communicated with the drain pipe 61 through a pipeline, and the waste liquid pipe 5 for discharging sewage is arranged at the bottom of the stripping tower 2.

[0055] A high-concentration ammonia-nitrogen wastewater treatment method, comprising the following steps:

[0056] S1: adding high-concentration ammonia-nitrogen sewage into sodium hydroxide for pH adjustment, so that the pH value is 11-13, wherein the ammonia-nitrogen concentration in the high-concentration ammonia-nitrogen sewage is 1000 mg / L to 10000 mg / L;

[0057] S2: passing the high-concentration ammonia-nitrogen sewage after pH adjustment into a stripping tower 2, and stripping the high-concentration ammonia-nitrogen sewage by an aeration pipe 3 in an aeration mode to obtain low-concentration ammonia-nitrogen sewage, wherein the ammonia-nitrogen concentration in the low-concentration ammonia-nitrogen sewage is 1000 mg / L to 3000 mg / L;

[0058] S3: simultaneously start the air inlet fan 4, transport the gas in the stripping tower 2 to the absorption tower 7, and simultaneously start the circulating pump 6, so that the spray holes on the spray pipe 73 in the cavity 723 are synchronously sprayed, the reaction force generated when the spray holes are sprayed can push the spray pipe 73 to rotate, cooperate with the characteristics of the reciprocating thread 737, make the spray pipe 73 periodically move up and down in the cavity 723, and through the transmission of the transmission rod 74, plus the different heights of each spray pipe 73 in the adjusting ring plate 731, make the multiple spray pipes 73 in the absorption tower 7 move up and down alternately, so that the pressing plate 741 synchronously presses or loosens the absorption net 753, so that half of the exhaust cavity 751 in the absorption tower 7 is always in an open state, and the water in the ammonia gas is absorbed, and at the same time, the water in the absorption net 753 is separated in time by the pressing plate 741;

[0059] S4: adding sodium sulfide solution to the wastewater, destroying the copper and chromium ammonia complex ions to form a precipitate, and then continuing to strip the wastewater;

[0060] S5: controlling the stripping time, so that when the ammonia nitrogen concentration in the sewage is less than 10 mg / L, the sewage can be discharged.

[0061] Further, before step S1, a pretreatment step is added, and the high-concentration ammonia nitrogen sewage to be treated is filtered to remove large particles and colloidal substances.

[0062] Further, the ammonia recovery liquid is at least one of hydrochloric acid, water or sulfuric acid.

[0063] Further, before the sewage meeting the ammonia nitrogen discharge standard is discharged, a disinfection and sterilization step is added to further remove residual viruses and microorganisms in the water body; in the disinfection and sterilization step, disinfection and sterilization are added in the material with filtering performance, so that filtering and disinfection and sterilization are realized at the same time.

[0064] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In this application, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and other terms should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0066] The control mode of the present application is automatically controlled by the controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art, the power supply also belongs to the common knowledge in the art, and the present application is mainly used to protect the mechanical device, so the control mode and the circuit connection of the present application will not be explained in detail.

[0067] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A high-concentration ammonia nitrogen wastewater treatment device, characterized in that: The utility model provides an ammonia gas recovery device, which comprises a stripping tower (2) and an absorption tower (7), the stripping tower (2) is internally provided with an aeration pipe (3), and the exhaust end of the stripping tower (2) is communicated with the air inlet end of the absorption tower (7) through a pipeline, the absorption tower (7) internally stores ammonia gas recovery liquid, and a plurality of through cavities (723) for waste gas to pass through are arranged in the middle of the absorption tower (7), the through cavities (723) are all provided with spray pipes (73) for spraying ammonia gas recovery liquid, the spray pipes (73) are movably arranged in the through cavities (723) and can rotate, the upper end of the absorption tower (7) is provided with a plurality of discharge cavities (751) for discharging ammonia gas, the discharge cavities (751) are all provided with separation net plates (752) at the outlets, the bottom of the separation net plates (752) is all provided with absorption nets (753) for absorbing water in the airflow, and the lower side of the discharge cavities (751) is all provided with extrusion plates (741) which can move up and down and extrude water in the absorption nets (753). The middle part of the through cavity (723) is provided with a fixedly connected adjusting ring plate (731), the spray pipe (73) is slidably connected in the adjusting ring plate (731), a plurality of spray holes for spraying ammonia gas recovery liquid are arranged on the spray pipe (73), the liquid direction of the spray holes is all inclined to spray in the same direction, and a reciprocating thread (737) is arranged in the middle part of the spray pipe (73).

2. The high-concentration ammonia-nitrogen wastewater treatment device according to claim 1, characterized in that: The spray holes comprise first holes (733) and second holes (734), and the first holes (733) and the second holes (734) are arranged at the upper and lower ends of the adjusting ring plate (731) respectively.

3. The device for treating high-concentration ammonia-nitrogen wastewater according to claim 1, characterized in that: The positions of different spray pipes (73) are different in height, the upper end of the spray pipe (73) is provided with a fixedly connected transmission rod (74), and the upper end of the transmission rod (74) is fixedly connected with the corresponding extrusion plate (741).

4. The device for treating high-concentration ammonia-nitrogen wastewater according to claim 1, characterized in that: One side of the absorption tower (7) is provided with a circulating pump (6), one end of the circulating pump (6) is provided with a water inlet pipe for sucking ammonia gas recovery liquid, the output end of the circulating pump (6) is provided with a drain pipe (61), and the drain pipe (61) is communicated with the spray pipe (73).

5. The device for treating high-concentration ammonia-nitrogen wastewater according to claim 4, characterized in that: An annular flow guide groove (7311) is arranged on the inner wall of the adjusting ring plate (731), a water inlet hole (735) is arranged on the side wall of the spray pipe (73) and communicated with the flow guide groove (7311), a plurality of fixed rods (732) are fixedly connected to the outside of the adjusting ring plate (731), the fixed rods (732) are fixedly connected with the inner wall of the through cavity (723), a flow guide groove (7321) is arranged in the middle part of the fixed rod (732) and communicated with the flow guide groove (7311), and the drain pipe (61) is communicated with the flow guide groove (7321).

6. The high-concentration ammonia-nitrogen wastewater treatment device according to claim 5, characterized in that: The water inlet hole (735) is located below the reciprocating thread (737), the height of the flow guide ring groove (7311) is greater than the up and down movement distance of the water inlet hole (735) in the flow guide ring groove (7311), the middle part of the spray pipe (73) and the bottom of the adjusting ring plate (731) are slidingly and sealingly connected, the upper end of the adjusting ring plate (731) is provided with a telescopic sealing pipe (736) for connecting and sealing, and the extension end of the sealing pipe (736) is rotationally and sealingly connected with the corresponding spray pipe (73).

7. The device for treating high-concentration ammonia-nitrogen wastewater according to claim 1, characterized in that: The gas inlet end of the absorption tower (7) is provided with an air inlet fan (4), one end of the air inlet fan (4) is communicated with the exhaust end of the stripping tower (2) through a pipeline, and the other end of the air inlet fan (4) is communicated with the gas inlet end of the absorption tower (7) through a pipeline.

8. A method for treating high-concentration ammonia-nitrogen wastewater, using a high-concentration ammonia-nitrogen wastewater treatment device according to any one of claims 1-7, characterized in that, The method comprises the following steps: S1: adding high-concentration ammonia-nitrogen sewage into sodium hydroxide for pH adjustment, so that the pH value is 11-13, wherein the ammonia-nitrogen concentration in the high-concentration ammonia-nitrogen sewage is 1000 mg / L to 10000 mg / L; S2: passing the high-concentration ammonia-nitrogen sewage after pH adjustment into the stripping tower (2), stripping the high-concentration ammonia-nitrogen sewage by the aeration pipe (3) in the form of aeration, and obtaining low-concentration ammonia-nitrogen sewage after treatment, wherein the ammonia-nitrogen concentration in the low-concentration ammonia-nitrogen sewage is 1000 mg / L to 3000 mg / L; S3: simultaneously starting the air inlet fan (4) to deliver the gas in the stripping tower (2) into the absorption tower (7), and simultaneously starting the circulating pump (6) to make the spray nozzles on the spray pipes (73) in the cavity (723) spray synchronously, the reaction force generated when the spray nozzles spray can drive the spray pipes (73) to rotate, and the reciprocating thread (737) can make the spray pipes (73) move up and down periodically in the cavity (723), and the transmission of the transmission rod (74) and the different heights of the spray pipes (73) in the adjusting ring plate (731) can make the multiple spray pipes (73) in the absorption tower (7) move up and down alternately, so that the pressing plates (741) can press or release the absorption nets (753) synchronously, and the half of the discharge cavities (751) in the absorption tower (7) can be kept in an open state to absorb the water in the ammonia gas, and the water in the absorption nets (753) in the other half of the discharge cavities (751) can be pressed and separated by the pressing plates (741) in time; S4: adding sodium sulfide solution into the wastewater to destroy the copper and chromium ammonia complex ions to form a precipitate, and then continuing to strip the wastewater; S5: controlling the stripping time, so that when the ammonia-nitrogen concentration in the sewage is less than 10 mg / L, the sewage can be discharged.

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