Method for treating high-salt high-organic silver-containing wastewater

Abstract

The present application relates to a kind of high salt high organic silver-containing wastewater treatment method, comprising pH adjustment, heating, ammonia stripping tower stripping gas phase ammonia nitrogen, spray tower spray absorption, demister water removal, active carbon tank filters organic matter;Two layers of spray tower are set in the spray tower lower packing layer and the packing of material is stacked into continuous staggered concave-convex, and by the net cover of cross section all wave shape is shaped fixed, the air distribution plate of upper packing layer is set to be wave shape with the upper and lower symmetry of the net cover;Spray head is connected by the corrugated pipe of outside sleeve set elastic element, elastic element one end is connected and fixed in the outer side of stop push plate again spray head, the other end is fixed in the outer side of shunt branch pipe again, and spray head staggered alternately opens and closes.The present application can push gas to four quarters horizontally, so that gas forms horizontal disturbance flow and overturn between net cover and upper air distribution plate, and then make airflow enter into the packing layer of concave-convex wave shape and fully contact reaction, greatly increase the contact surface of gas and liquid, further improve spray effect.

Description

A method for treating silver-containing wastewater with high salt and high organic matter content Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a method for treating silver-containing wastewater with high salt and high organic matter content. Background Technology

[0002] Heavy metal wastewater mainly originates from wastewater discharged by mining, smelting, electrolysis, electroplating, pesticide, pharmaceutical, paint, and pigment enterprises. Direct discharge of heavy metal wastewater without treatment will severely pollute the environment. Therefore, wastewater needs to be treated using physical, chemical, or biological methods to purify it, reduce pollution, and ultimately achieve wastewater recycling and reuse, making full use of water resources.

[0003] During silver powder production, every ton of silver powder generates 25 tons of concentrated wastewater and 20 tons of dilute wastewater. If the first phase produces 60 tons of silver powder over 300 production days, this translates to 5 tons of concentrated wastewater and 4 tons of dilute wastewater per day. Because of the high ammonia nitrogen content in both concentrated and dilute wastewater, if this ammonia nitrogen is not removed beforehand and the wastewater is directly discharged into the silver-containing concentrated wastewater pretreatment system (pretreatment process: pH adjustment + sedimentation, where the wastewater needs to be adjusted to a slightly acidic state) before being discharged into the wastewater treatment plant, it will not only affect or even inhibit the treatment of the silver-containing concentrated wastewater pretreatment system but also cause ammonia nitrogen pollution in the water body. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a silver-containing wastewater treatment system that can effectively solve the technical problems existing in the prior art.

[0005] The technical solution of this invention is:

[0006] A method for treating silver-containing wastewater with high salinity and high organic matter content includes the following specific steps:

[0007] S1, collect silver-containing wastewater in a collection tank and homogenize and equalize the volume;

[0008] S2, pump the homogenized and equalized silver-containing wastewater into the pH adjustment tank to adjust the pH value of the silver-containing wastewater to 12.

[0009] S3, the silver-containing wastewater after pH adjustment is added to the intermediate water tank and heated to 35℃-40℃;

[0010] S4, ammonia nitrogen removal treatment for heated silver-containing wastewater, including:

[0011] S41, the heated silver-containing wastewater is pumped sequentially into at least one ammonia stripping tower, and the waste gas containing gaseous ammonia nitrogen and the waste liquid with removed ammonia nitrogen are obtained after treatment in the ammonia stripping tower.

[0012] S42, using an acid and alkali resistant blower, the waste gas containing gaseous ammonia nitrogen is sequentially blown into at least one stage of spray tower for spray treatment. The spray treatment includes: the waste gas containing gaseous ammonia nitrogen is introduced into the spray tower and sprayed from bottom to top through two stages. During the upward flow of the waste gas containing gaseous ammonia nitrogen, the spray heads are controlled to spray alternately. The spray heads in the open state move downward under the action of the liquid impact force, and drive the baffle plate fixed to the outer edge of the spray head to move downward, pushing the upward waste gas containing gaseous ammonia nitrogen downward, so that the gas is distributed and flowed laterally in all directions; the spray heads in the closed state are reset and moved upward under the action of the elastic potential energy of the elastic element.

[0013] S43, the exhaust gas containing gaseous ammonia nitrogen from the previous spray tower is discharged to the next spray tower for re-absorption, and the exhaust gas after absorption by the last spray tower enters the demister to filter out excess moisture in the exhaust gas. The filtered exhaust gas is then passed into the activated carbon box for organic matter interception. The treated clean gas is discharged through the chimney in compliance with standards.

[0014] S5, the waste liquid obtained by the ammonia stripping tower in step S41 after the ammonia nitrogen removal is discharged into the silver-containing concentrated water pretreatment system.

[0015] The silver-containing wastewater in step S1 includes silver-containing concentrated water and silver-containing desalinated water collected in an intermediate water tank through a corresponding wastewater collection system. The silver-containing concentrated water and silver-containing desalinated water in the intermediate water tank are pumped into the collection pool.

[0016] All the waste gas containing gaseous ammonia nitrogen stripped by the ammonia stripping tower in step S41, and the silver-containing waste gas generated by the production line collected by the gas collection pipeline, are fed into the spray tower in step S42 for spray absorption treatment. The gas collection pipeline is connected to the waste gas discharge port of the reaction vessel and the washing vessel.

[0017] In step S5, the waste liquid from which ammonia nitrogen has been removed is first discharged into the effluent tank for temporary storage. Then, the waste liquid from which ammonia nitrogen has been removed is introduced into the silver-containing concentrated water pretreatment system by pumping. After mixing with the original acidic silver-containing concentrated water, the pH value of the mixture is adjusted to 4-6 before being discharged into the sewage treatment plant for treatment.

[0018] The ammonia nitrogen concentration in the waste liquid obtained after ammonia nitrogen removal in step S5 is <2300 mg / L. When the gas-to-water ratio of the waste gas containing gaseous ammonia nitrogen in the ammonia stripping tower is 3000:1, the air volume of the acid and alkali resistant blower is 3500 m³ / L. 3 / h-4500m 3 / h; the waste gas volume generated by the reaction vessel and the washing vessel is 700m³. 3 At a rate of / h, the air volume of the fan connected to the air collection pipeline is 1000m³. 3 / h-1500m 3 / h.

[0019] Step S42 is implemented based on a spray tower, which includes a spray tower body with an inlet at the bottom for the flow of gaseous ammonia nitrogen waste gas. The spray tower body has two layers of packing material installed at intervals, and spraying components installed at intervals above the packing layers. Each spraying component includes a grid main pipe that is horizontally and vertically interconnected and fixedly installed within the spray tower body. Below the grid main pipe are numerous spray heads that can be moved vertically. The spray heads open and close alternately, with adjacent spray heads opening and closing alternately. A corresponding baffle plate is fixedly installed on the outer top of each spray head. The packing layer consists of an air distribution plate filled with numerous packing materials. The surface of the air distribution plate has numerous permeable holes with a diameter smaller than the particle size of the packing materials. The upper surface of the packing materials in the lower packing layer is stacked in a continuous, staggered concave-convex shape and shaped and fixed by a mesh cover with a wavy cross-section. The air distribution plate in the upper packing layer is symmetrically wavy with the mesh cover.

[0020] Below the main mesh pipe, corresponding to the concave and convex positions of the mesh cover, there are corresponding branch pipes. The branch pipes are connected to the spray heads through corresponding corrugated pipes. The outer side of the corrugated pipes is fitted with elastic members whose ends are respectively fixed to the push plate and the branch pipes.

[0021] Each of the branch pipes is equipped with a corresponding controllable solenoid valve, which is used to control the opening or closing of the spray head.

[0022] The spray heads of the upper and lower spray assemblies open and close alternately.

[0023] The exhaust gas outlet of the ammonia stripping tower is connected to the inlet of the first spray tower via a corresponding acid and alkali fan and exhaust gas pipe. The spray towers are connected in series, and the outlet of the front spray tower is connected to the inlet of the rear spray tower. The first spray tower connected to the exhaust gas outlet of the ammonia stripping tower is connected to the exhaust port of the production line containing ammonia exhaust gas via a corresponding gas collection pipeline.

[0024] Advantages of this invention:

[0025] 1) This invention involves collecting and homogenizing silver-containing concentrated wastewater and silver-containing desalinated wastewater, adjusting the pH to 11 with alkali, and then heating it to 35℃-40℃ before passing it through at least one ammonia stripping tower. This strips the ammonia nitrogen from the silver-containing wastewater in gaseous form, resulting in a pre-treated wastewater ammonia nitrogen concentration <2300 mg / L. The ammonia-removed silver-containing wastewater is then directly discharged into a silver-containing concentrated wastewater pretreatment system to mix with the originally acidic silver-containing concentrated wastewater. The pH is adjusted to 5 before the wastewater is further treated at a wastewater treatment plant. This effectively avoids excessive ammonia nitrogen in the concentrated and desalinated wastewater. The high concentration of ammonia nitrogen in the wastewater affects the pretreatment system and avoids ammonia nitrogen pollution in the water. Furthermore, the waste gas containing ammonia nitrogen from the stripping process is uniformly processed through at least one spray tower. The spraying method maximizes the contact reaction between the ammonia nitrogen and the dilute sulfuric acid liquid, thereby reducing the concentration of ammonia nitrogen in the water and the exhaust gas. Then, it enters the demister and activated carbon box in sequence to filter out excess moisture and retain organic matter in the waste gas. Finally, the clean gas is discharged through the chimney in compliance with standards, so as to achieve environmental protection and maintain the balance of the aquatic ecosystem.

[0026] 2) In this invention, gaseous ammonia nitrogen enters a spray tower and reacts with dilute sulfuric acid to reduce the concentration of ammonia nitrogen in the gas and liquid. The spray tower is equipped with two layers of packing material and two layers of spray components. The upper surface of the packing material in the lower layer is stacked in a continuous, staggered concave-convex shape and fixed by a mesh cover with a wavy cross-section. The gas distribution plate of the upper packing layer is symmetrically wavy with the mesh cover. Furthermore, the spray heads of the spray components are arranged in a one-to-one correspondence with the concave-convex positions of the mesh cover. The spray heads are connected to branch pipes via corrugated pipes. The spray head is activated by the opening of a controllable solenoid valve, allowing the liquid to flow out... The impact force drives the spray head downward, which in turn moves the baffle plate fixed to the spray head downward, pressing down the upward airflow and pushing it laterally to diffuse in all directions. The spray head is set to open and close alternately. When the spray head is closed, the elastic potential energy of the elastic element drives the baffle plate upward, further pushing the gas laterally in all directions. This causes the gas to form lateral turbulence and tumbling between the mesh cover and the upper air distribution plate, allowing the airflow to fully contact and react in the undulating packing layer, greatly increasing the contact area between the gas and the liquid, and further improving the spraying effect.

[0027] 3) In this invention, the spray heads of the upper and lower spray components are also opened and closed alternately. When the lower baffle plate moves up, the upper baffle plate moves down, thereby preventing the gas from spreading upward quickly and further controlling the gas to have full contact with the liquid to the maximum extent, so as to remove ammonia nitrogen to the maximum extent.

[0028] 4) The spray head of the present invention is connected to the branch pipe through a corrugated pipe, thereby ensuring that it can move up and down; by using the controllable solenoid valve to open, the impact force of the liquid spraying out drives the spray head and the baffle plate to move down, and by using the elastic potential energy of the tension elastic element to drive the closed spray head to move up and reset, the spray head and the baffle plate can move up and down without adding other power, thus ensuring the practical effect of the present invention while controlling energy consumption. Attached Figure Description

[0029] Figure 1 is a process flow diagram of the silver-containing wastewater treatment according to the present invention.

[0030] Figures 2 and 3 are schematic diagrams of the installation of the spray tower in this invention.

[0031] Figure 4 is a cross-sectional view of the spray tower in this invention.

[0032] Figure 5 is an enlarged schematic diagram of part A in Figure 4.

[0033] Figure 6 is a schematic diagram of the mesh cover.

[0034] Figure 7 is a schematic diagram of the air distribution plate of the upper packing layer.

[0035] In the attached diagram: 1. Spray tower body; 2. Grid main pipe; 3. Spray head; 4. Corrugated pipe; 5. Air distribution plate; 6. Mesh cover; 7. Diversion branch pipe; 8. Baffle plate; 9. Elastic component; 11. Circulating water tank; 12. Dosing tank; 13. Demister; 14. Activated carbon box. Detailed Implementation

[0036] To facilitate understanding by those skilled in the art, the structure of the present invention will now be described in further detail with reference to the accompanying drawings:

[0037] Referring to Figures 1-7, a method for treating silver-containing wastewater with high salinity and high organic matter content includes the following specific steps:

[0038] S1, collect silver-containing wastewater in a collection tank and homogenize and equalize the volume;

[0039] S2, pump the homogenized and equalized silver-containing wastewater into the pH adjustment tank to adjust the pH value of the silver-containing wastewater to 12.

[0040] S3, the silver-containing wastewater after pH adjustment is added to the intermediate water tank and heated to 35℃-40℃;

[0041] S4, ammonia nitrogen removal treatment for heated silver-containing wastewater, including:

[0042] S41, the heated silver-containing wastewater is pumped sequentially into at least one ammonia stripping tower, and the waste gas containing gaseous ammonia nitrogen and the waste liquid with removed ammonia nitrogen are obtained after treatment in the ammonia stripping tower.

[0043] S42, using acid and alkali resistant blowers to sequentially blow waste gas containing gaseous ammonia nitrogen into at least one stage of spray tower for spray treatment, the spray treatment including:

[0044] Waste gas containing gaseous ammonia nitrogen is introduced into the spray tower and treated by two sprays from bottom to top. As the waste gas containing gaseous ammonia nitrogen flows upward, the spray heads 3 spray alternately by controlling the spray. The spray heads in the open state move downward under the impact force of the liquid, and drive the baffle plate 8 fixed to the outer edge of the spray head 3 to move downward, pushing the waste gas containing gaseous ammonia nitrogen downward, so that the gas flows laterally in all directions. The spray heads 3 in the closed state are reset and moved upward under the elastic potential energy of the elastic element 9.

[0045] The spray head 3 alternately opens and closes with delays, and when spray head 3 opens, adjacent spray heads 3 close, and when spray head 3 closes, adjacent spray heads 3 open, achieving staggered opening and closing. This causes the vertically alternating spray heads 3 to drive the connected baffle plate 8 to move vertically in an alternating manner, thereby causing the exhaust gas to flow laterally in all directions, forming lateral turbulence and tumbling. Simultaneously, as the exhaust gas is pushed downwards, it also enters laterally again into the lower packing layer, which has a wavy upper section and is fixed by the mesh cover 6, without affecting the flow of exhaust gas. In this case, the contact area between the waste gas and the acidic liquid material is increased, thereby improving the purification effect. Furthermore, a turbulence zone is formed between the upper and lower packing layers, allowing the waste gas and the acidic liquid material to have maximum contact. Then, the upper air distribution plate 5, which is symmetrically arranged with the mesh cover 6 of the lower packing layer, moves the baffle plate 8 upward when the spray head 3 is reset. Together with the upper air distribution plate 5 with its wavy cross section, the waste gas is pushed upward and laterally to all sides, further increasing the contact area between the waste gas and the acidic liquid material.

[0046] The liquid in each level of the spray tower flows into the corresponding circulating water tank 11, and all the circulating water tanks 11 are connected to the dosing tank 12 by a pump. Acidic materials are added to each circulating water tank 11 through the dosing tank 12. After the circulating water tank 11 is dosed, the acidic liquid is added to the corresponding spray tower by a pump.

[0047] S43, the exhaust gas containing gaseous ammonia nitrogen from the previous spray tower is discharged to the next spray tower for re-absorption, and the exhaust gas after absorption by the last spray tower enters the demister 13 to filter out excess moisture in the exhaust gas, and then the filtered exhaust gas is passed into the activated carbon box 14 for organic matter interception, and the treated clean gas is discharged through the chimney in compliance with standards.

[0048] S5, the waste liquid obtained by the ammonia stripping tower in step S41 after the ammonia nitrogen removal is discharged into the silver-containing concentrated water pretreatment system.

[0049] The silver-containing wastewater in step S1 includes silver-containing concentrated water and silver-containing desalinated water collected in an intermediate water tank through a corresponding wastewater collection system. The silver-containing concentrated water and silver-containing desalinated water in the intermediate water tank are pumped into the collection pool.

[0050] All the waste gas containing gaseous ammonia nitrogen stripped by the ammonia stripping tower in step S41, and the silver-containing waste gas generated by the production line collected by the gas collection pipeline, are fed into the spray tower in step S42 for spray absorption treatment. The gas collection pipeline is connected to the waste gas discharge port of the reaction vessel and the washing vessel.

[0051] In step S5, the waste liquid from which ammonia nitrogen has been removed is first discharged into the effluent tank for temporary storage. Then, the waste liquid from which ammonia nitrogen has been removed is introduced into the silver-containing concentrated water pretreatment system by pumping. After mixing with the original acidic silver-containing concentrated water, the pH value of the mixture is adjusted to 4-6 before being discharged into the sewage treatment plant for treatment.

[0052] The ammonia nitrogen concentration in the waste liquid obtained after ammonia nitrogen removal in step S5 is <2300 mg / L. When the gas-to-water ratio of the waste gas containing gaseous ammonia nitrogen in the ammonia stripping tower is 3000:1, the air volume of the acid and alkali resistant blower is 3500 m³ / L. 3 / h-4500m 3 / h; the waste gas volume generated by the reaction vessel and the washing vessel is 700m³. 3 At a rate of / h, the air volume of the fan connected to the air collection pipeline is 1000m³. 3 / h-1500m 3 / h.

[0053] This invention involves collecting and homogenizing silver-containing concentrated and distilled wastewater, adjusting the pH to 11 with alkali, and then heating it to 35-40°C before passing it through at least one ammonia stripping tower. This strips the ammonia nitrogen from the silver-containing wastewater in a gaseous phase, resulting in a pre-treated wastewater ammonia nitrogen concentration <2300 mg / L. The ammonia-removed silver-containing wastewater is then directly discharged into a silver-containing concentrated wastewater pretreatment system to mix with the originally acidic silver-containing concentrated wastewater. The pH is adjusted to 5 before the wastewater is further treated at a wastewater treatment plant. This process effectively avoids high ammonia nitrogen content in both concentrated and distilled wastewater. The treatment of silver-containing concentrated water pretreatment system avoids ammonia nitrogen pollution in water bodies. Furthermore, the stripped waste gas containing gaseous ammonia nitrogen passes through at least one spray tower, where the gaseous ammonia nitrogen and dilute sulfuric acid liquid are brought into maximum contact and reaction through spraying, thereby reducing the ammonia nitrogen concentration in the water and the exhaust gas. Then, it enters the demister and activated carbon adsorption box in sequence to filter out excess moisture and retain organic matter in the waste gas. Finally, the clean gas is discharged through the chimney in compliance with standards, so as to achieve environmental protection and maintain the balance of the aquatic ecosystem.

[0054] Step S42 is implemented based on a spray tower, which includes a spray tower body 1 with an inlet at the bottom for the flow of gaseous ammonia nitrogen waste gas. The spray tower body 1 has two layers of packing material installed at intervals, and spraying components installed at intervals above the packing material layers. The spraying components include a grid main pipe 2 that is horizontally and vertically connected and fixedly installed in the spray tower body 1. A plurality of spray heads 3 that can be moved up and down are connected and installed below the grid main pipe 2. The spray heads 3 open and close alternately and adjacent spray heads open and close alternately. A corresponding baffle plate 8 is fixedly installed on the outer side of the top of the spray head 3. The packing material layer is composed of a gas distribution plate 5 filled with a plurality of packing materials. The surface of the gas distribution plate 5 is evenly distributed with a plurality of air vents with a diameter smaller than the particle size of the packing materials. The upper surface of the packing materials in the lower packing material layer is stacked in a continuous and staggered concave-convex shape and is shaped and fixed by a mesh cover 6 with a wavy cross section. The gas distribution plate 5 of the upper packing material layer is set in a wavy shape that is symmetrical to the mesh cover 6.

[0055] In this invention, gaseous ammonia nitrogen enters a spray tower and reacts with dilute sulfuric acid to reduce the concentration of ammonia nitrogen in the gas and liquid. The spray tower is equipped with two layers of packing material and two layers of spray components. The upper surface of the packing material in the lower layer is stacked in a continuous, staggered concave-convex shape and fixed by a mesh cover 6 with a wavy cross-section. The gas distribution plate 5 of the upper packing layer is symmetrically wavy with the mesh cover 6. Furthermore, the spray heads 3 of the spray components are arranged in a one-to-one correspondence with the concave-convex positions of the mesh cover 6. The spray heads 3 are connected to the branch pipes 7 via corrugated pipes 4. The spray head 3 is activated by the opening of a solenoid valve, which impacts the outflowing liquid. Under the action of force, the spray head 3 is driven to move downward, and the baffle plate 8 fixed on the spray head 3 moves downward, pressing the upward airflow downward and pushing it to spread laterally in all directions. The opening and closing of the spray head 3 is set to alternately open and close. Under the action of the elastic potential energy of the elastic element 9, the closed spray head 3 drives the baffle plate 8 to move upward, further pushing the gas laterally in all directions. This causes the gas to form lateral turbulence and tumbling between the mesh cover 6 and the upper air distribution plate 5, thereby allowing the airflow to fully contact and react in the undulating packing layer, greatly increasing the contact area between the gas and the liquid, and further improving the spraying effect.

[0056] The grid main pipe 2 is provided with corresponding branch pipes 7 at the concave and convex positions of the mesh cover 6. The branch pipes 7 and the spray head 3 are connected by corresponding corrugated pipes 4. The outer side of the corrugated pipe 4 is fitted with elastic members 9 with their ends fixed to the push plate 8 and the branch pipes 7 respectively.

[0057] Each of the branch pipes 7 is equipped with a corresponding controllable solenoid valve, which is used to control the opening or closing of the spray head 3. That is, the controllable solenoid valve opens and closes after a delay of T, and the closing time is T. At the same time as the controllable solenoid valve closes, the adjacent controllable solenoid valve opens and delays for a period of T.

[0058] The spray head 3 of the present invention is connected to the branch pipe 7 via the bellows 4, thereby ensuring that it can move up and down; by opening the solenoid valve, the impact force of the liquid spraying out drives the spray head 3 and the baffle plate 8 to move down, and by using the elastic potential energy of the tension elastic element 9 to drive the closed spray head 3 to move up and reset, the spray head 3 and the baffle plate 8 can move up and down without adding other power, thus ensuring the practical effect of the present invention while controlling energy consumption.

[0059] The spray heads 3 of the upper and lower spray components are opened and closed alternately. That is, when the spray head 3 of the lower spray component is open, the spray head 3 of the upper spray component is closed, and when the spray head 3 of the lower spray component is closed, the spray head 3 of the upper spray component is open.

[0060] In this invention, the spray heads 3 of the upper and lower spray components are opened and closed alternately. When the lower baffle plate 8 moves upward, the upper baffle plate 8 moves downward, thereby preventing the gas from spreading upward rapidly and further controlling the gas to have full contact with the liquid to the maximum extent, so as to remove ammonia nitrogen to the greatest extent.

[0061] The exhaust gas outlet of the ammonia stripping tower is connected to the inlet of the first spray tower via a corresponding acid and alkali fan and exhaust gas pipe. The spray towers are connected in series, and the outlet of the front spray tower is connected to the inlet of the rear spray tower. The first spray tower connected to the exhaust gas outlet of the ammonia stripping tower is connected to the exhaust port of the production line containing ammonia exhaust gas via a corresponding gas collection pipeline.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for treating silver-containing wastewater with high salinity and high organic matter content, characterized in that, The specific steps include: S1, collecting silver-containing wastewater in a collection tank and homogenizing it; S2, pumping the homogenized silver-containing wastewater into a pH adjustment tank to adjust the pH value to 12; S3, adding the pH-adjusted silver-containing wastewater to an intermediate water tank and heating it to 35℃-40℃; S4, treating the heated silver-containing wastewater for ammonia nitrogen removal, including: S41, pumping the heated silver-containing wastewater sequentially into at least one ammonia stripping tower, obtaining waste gas containing gaseous ammonia nitrogen and waste liquid with removed ammonia nitrogen after treatment in the ammonia stripping tower; S42, using an acid and alkali resistant blower to blow the waste gas containing gaseous ammonia nitrogen sequentially into at least one spray tower for spray treatment, the spray treatment including: The waste gas containing gaseous ammonia nitrogen is introduced into the spray tower and treated by two sprays from bottom to top. During the upward flow of the waste gas containing gaseous ammonia nitrogen, the spray heads (3) are controlled to spray alternately. The spray heads in the open state move downward under the action of the liquid impact force, and drive the baffle plate (4) fixed to the outer edge of the spray head (3) to move downward, pushing the waste gas containing gaseous ammonia nitrogen downward, so that the gas flows laterally in all directions; the spray heads (3) in the closed state are reset and moved upward under the action of the elastic potential energy of the elastic element (9); S43, the waste gas containing gaseous ammonia nitrogen from the upper spray tower is discharged to the lower spray tower for re-absorption, and the waste gas after absorption by the last spray tower enters the demister (1). 3) Filter out excess moisture from the waste gas, and then pass the filtered waste gas into the activated carbon box (14) for organic matter interception. The treated clean gas is discharged through the chimney in compliance with standards; S5, the waste liquid obtained by the ammonia stripping tower in step S41 is discharged into the silver-containing concentrated water pretreatment system; Step S42 is implemented based on a spray tower, which includes a spray tower body (1) with an air inlet at the bottom for the flow of gaseous ammonia nitrogen waste gas. The spray tower body (1) is equipped with two layers of packing material at intervals. The packing material is composed of a gas distribution plate (5) filled with a variety of packing materials. The surface of the gas distribution plate (5) is evenly distributed with a variety of air vents with a diameter smaller than that of the packing material. The lower layer The upper surface of the packing material in the packing layer is stacked in a continuous and staggered concave-convex shape and is shaped and fixed by a mesh cover (6) with a wavy cross section. The air distribution plate (5) of the upper packing layer is set in a wavy shape that is symmetrical to the mesh cover (6). Spraying components are installed at intervals above the two packing layers in the spray tower body (1). The spraying components include a grid main pipe (2) that is connected horizontally and vertically and fixedly installed in the spray tower body (1). A number of spray heads (3) that can be moved up and down are connected and installed below the grid main pipe (2). The spray heads (3) are opened and closed alternately and adjacent spray heads are opened and closed alternately. A corresponding baffle plate (4) is fixedly installed on the outer side of the top of the spray head (3).

2. The method for treating high-salt, high-organic-content silver-containing wastewater according to claim 1, characterized in that, The silver-containing wastewater in step S1 includes silver-containing concentrated water and silver-containing desalinated water collected in an intermediate water tank through a corresponding wastewater collection system. The silver-containing concentrated water and silver-containing desalinated water in the intermediate water tank are pumped into the collection pool.

3. The method for treating high-salt, high-organic-content silver-containing wastewater according to claim 1, characterized in that, All the waste gas containing gaseous ammonia nitrogen stripped by the ammonia stripping tower in step S41, and the silver-containing waste gas generated by the production line collected by the gas collection pipeline, are fed into the spray tower in step S42 for spray absorption treatment. The gas collection pipeline is connected to the waste gas discharge port of the reaction vessel and the washing vessel.

4. The method for treating high-salt, high-organic-content silver-containing wastewater according to claim 1, characterized in that, In step S5, the waste liquid from which ammonia nitrogen has been removed is first discharged into the effluent tank for temporary storage. Then, the waste liquid from which ammonia nitrogen has been removed is introduced into the silver-containing concentrated water pretreatment system by pumping. After mixing with the original acidic silver-containing concentrated water, the pH value of the mixture is adjusted to 4-6 before being discharged into the sewage treatment plant for treatment.

5. The method for treating silver-containing wastewater with high salinity and high organic matter content according to claim 3, characterized in that, The ammonia nitrogen concentration in the waste liquid obtained after ammonia nitrogen removal in step S5 is <2300 mg / L. When the gas-to-water ratio of the waste gas containing gaseous ammonia nitrogen in the ammonia stripping tower is 3000:1, the air volume of the acid and alkali resistant blower is 3500 m³ / L. 3 / h-4500m 3 / h; the waste gas volume generated by the reaction vessel and the washing vessel is 700m³. 3 At a rate of / h, the air volume of the fan connected to the air collection pipeline is 1000m³. 3 / h-1500m 3 / h.

6. The method for treating silver-containing wastewater with high salinity and high organic matter content according to claim 1, characterized in that, The grid main pipe (2) is connected to the concave and convex positions of the mesh cover (6) with corresponding branch pipes (7), and the branch pipes (7) and the spray head (3) are connected by corresponding corrugated pipes (8). The outer side of the corrugated pipe (8) is fitted with elastic elements (9) with the ends fixed to the push plate (4) and the branch pipe (7) respectively.

7. The method for treating silver-containing wastewater with high salinity and high organic matter content according to claim 6, characterized in that, Each of the branch pipes (7) is equipped with a corresponding controllable solenoid valve, which is used to control the opening or closing of the spray head (3).

8. A method for treating silver-containing wastewater with high salinity and high organic matter content according to claim 7, characterized in that, The spray heads (3) of the upper and lower spray components are opened and closed alternately.

9. A method for treating silver-containing wastewater with high salinity and high organic matter content according to claim 8, characterized in that, The exhaust gas outlet of the ammonia stripping tower is connected to the inlet of the first spray tower via a corresponding acid and alkali fan and exhaust gas pipe. The spray towers are connected in series, and the outlet of the front spray tower is connected to the inlet of the rear spray tower. The first spray tower connected to the exhaust gas outlet of the ammonia stripping tower is connected to the exhaust port of the production line containing ammonia exhaust gas via a corresponding gas collection pipeline.

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