Stripping box and high-salt and high-ammonia-nitrogen wastewater treatment device

Abstract

The utility model relates to the technical field of wastewater treatment, and discloses an air stripping box and a high-salt and high-ammonia-nitrogen wastewater treatment device. The air stripping box comprises a box body, at least one steam atomization air stripping assembly is arranged in the box body, each steam atomization air stripping assembly comprises a waste water atomization device and a steam distribution pipe, the waste water atomization device is connected with a waste water inlet and arranged above the steam distribution pipe, the steam distribution pipe is connected with a steam source, and the steam source is connected with a steam outlet. Distribution holes are formed in the pipe walls of the steam distribution pipes, and wastewater downcomer channels are arranged among the steam distribution pipes. According to the utility model, steam is used as an air stripping medium, and ammonia after air stripping is pumped to the tail gas absorption device through the fan and is absorbed into ammonia water by water, so that the tower is wide in material selection, and the hidden danger of corrosivity of the existing acidic absorption liquid is reduced; the absorbed ammonia water can be directly returned to a production process or sold to realize resource utilization; the absorption device is made of a metal material, and high-concentration ammonia water can be obtained through pressure-resistant design; and the risk of secondary pollution is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a stripping box and a high-salt, high-ammonia-nitrogen wastewater treatment device. Background Technology

[0002] p-Nitroaniline, appearing as yellow needle-like crystals, is characterized by high toxicity, easy sublimation, and a high freezing point. It is an important intermediate in the dye industry and pharmaceutical chemicals, and can also be used to synthesize p-phenylenediamine, among other things. After the nitroaniline reaction, the wastewater is treated by extraction to remove the dissolved nitroaniline. The high-salt, high-ammonia-nitrogen wastewater is then stripped to recover ammonia for resource utilization. The stripped wastewater is further concentrated by evaporation to recover salt.

[0003] Existing stripping treatment devices for high-salt, high-ammonia-nitrogen wastewater have significant shortcomings:

[0004] 1. The existing stripping method for treating high-salt wastewater involves adjusting the wastewater to a strongly alkaline state to convert ionic ammonium into molecular ammonia. Molecular ammonia is then blown out of the wastewater using air as a medium. The ammonia at the stripping point needs to be absorbed by acid and then converted into salt (ammonium sulfate or ammonium chloride).

[0005] 2. Air stripping requires a large amount of air, resulting in poor absorption and secondary pollution;

[0006] 3. High energy consumption, as the air needs to be heated before entering the stripping device for stripping. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a stripping box and a high-salt, high-ammonia nitrogen wastewater treatment device.

[0008] To achieve the above objectives, the technical solution adopted is:

[0009] One of the objectives of this utility model is to provide a stripping box, including a box body, wherein at least one set of steam atomizing stripping components are provided inside the box body. The steam atomizing stripping components include a wastewater atomizing device and a steam distribution pipe. The wastewater atomizing device is connected to a wastewater inlet and is located above the steam distribution pipe. The steam distribution pipe is connected to a steam source. Distribution holes are provided on the upper wall of the steam distribution pipe. Wastewater downflow channels are provided between the steam distribution pipes.

[0010] Based on the above technical solution, the present invention can be further improved as follows:

[0011] Furthermore, the wastewater atomizing device includes a rotating nozzle.

[0012] Furthermore, the rotating nozzle includes a nozzle that is positioned downwards.

[0013] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the rotating nozzle can rotate, and the downward-facing nozzle can ensure that the atomized wastewater comes into full contact with the steam rising from below, making the ammonia removal more complete and efficient.

[0014] Furthermore, the steam distribution pipe is a flat pipe, the steam distribution pipe is horizontally arranged, the distribution hole is located on the upper pipe wall of the steam distribution pipe, and the diameter of the distribution hole is 1.5 to 5 mm.

[0015] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the steam distribution pipe is a flat pipe, which can increase the injection area and improve efficiency; the distribution holes are located on the upper pipe wall of the steam distribution pipe, which can reduce the amount of steam used and reduce costs compared to the lower pipe wall.

[0016] Furthermore, a connecting plate 14 is provided between the steam distribution pipes, and the through holes provided on the connecting plate 14 are wastewater downcomer channels.

[0017] The second objective of this utility model is to provide a high-salt, high-ammonia-nitrogen wastewater treatment device, including the stripping box, which has a gas phase outlet. The gas phase outlet is connected to a tail gas absorption device through a pipeline, and a wastewater regulating device is provided between the wastewater atomizing device and the wastewater inlet.

[0018] Furthermore, an induced draft fan is installed on the pipeline between the gas phase outlet and the tail gas absorption device.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is that the induced draft fan is used to introduce the ammonia-containing gas obtained in the stripping box into the tail gas absorption device.

[0020] Furthermore, the wastewater regulating device is an inclined plate separator, and a wastewater feed pump is installed on the pipeline between the inclined plate separator and the wastewater atomizing device. A mixer is connected to the pipeline at the end of the inclined plate separator away from the wastewater feed pump, and the mixer is connected to a wastewater inlet and an alkali inlet respectively.

[0021] The beneficial effect of adopting the above-mentioned further technical solution is that the inclined plate separation tank is used to pre-separate impurities in wastewater, thereby reducing the probability of clogging of the wastewater atomization device.

[0022] Furthermore, the stripping box is equipped with a liquid phase outlet, which is connected to an evaporation device via a stripping wastewater extraction pump.

[0023] Furthermore, the exhaust gas absorption device is a circulating spray tower.

[0024] Furthermore, the bottom of the circulating spray tower is connected to a tail gas absorption and circulation pump, which returns the gas to the top of the tower through a pipeline. The top of the circulating spray tower is connected to a demineralized water pipeline.

[0025] Furthermore, the stripping box has a multi-layer structure, with each layer containing a set of steam atomization stripping components.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows: by using steam as the stripping medium, the stripped ammonia is pumped by a fan to the ammonia absorption tower of the tail gas absorption device, where it is absorbed by water to form ammonia water. The tower has a wide range of material options, reducing the corrosive risks of existing acidic absorption liquids. The absorbed ammonia water can be directly returned to the production process or sold to achieve resource utilization. The absorption device is made of metal and is designed to withstand pressure, which can produce high-concentration ammonia water. The risk of secondary pollution is reduced. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the high-salt, high-ammonia-nitrogen wastewater treatment device of this utility model;

[0028] Figure 2 This is a longitudinal cross-sectional view of the steam distribution pipe and wastewater downcomer channel of this utility model.

[0029] The attached diagram is labeled as follows: 1. Stripping box; 2. Tail gas absorption device; 3. Wastewater regulating device; 4. Mixer; 5. Exhaust fan; 6. Wastewater feed pump; 7. Stripping wastewater collection pump; 8. Tail gas absorption circulation pump; 11. Steam distribution pipe; 12. Wastewater atomizing device; 13. Wastewater downcomer channel; 111. Distribution hole; 14. Connecting plate; 15. Main pipe. Detailed Implementation

[0030] The present invention will be described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0031] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Reference Figures 1-2 A stripping chamber 1 includes a chamber body. At least one set of steam atomizing stripping components is provided inside the chamber body. Each steam atomizing stripping component includes a wastewater atomizing device 12 and a steam distribution pipe 11. The wastewater atomizing device 12 is connected to a wastewater inlet, specifically a high-salt, high-ammonia-nitrogen wastewater inlet. The wastewater atomizing device 12 is positioned above the steam distribution pipe 11. The steam distribution pipe 11 is connected to a steam source. The steam pressure for stripping is 0.2 MPa. Distribution holes 111 are provided on the pipe wall of the steam distribution pipe 11. Wastewater downcomer channels 13 are provided between the steam distribution pipes 11. Figure 2 As shown, a connecting plate 14 is provided between the steam distribution pipes 11, and the through holes provided on the connecting plate 14 are the wastewater downcomer channels 13. Figure 1 The diagram shows three sets of steam atomization stripping components and a three-layer stripping chamber 1.

[0034] In an optional embodiment, the wastewater atomizing device 12 includes a rotating nozzle. Specifically, the blow-off box 1 is provided with a connecting main pipe 15, and the rotating nozzle is welded to the main pipe 15.

[0035] In a preferred embodiment, the rotating nozzle includes a nozzle that is disposed downwards.

[0036] In this embodiment, the distribution hole 111 is located on the upper pipe wall of the steam distribution pipe 11.

[0037] In this embodiment, as Figure 2 As shown, the steam distribution pipe 11 is a flat pipe, the steam distribution pipe 11 is horizontally arranged, and the diameter of the distribution hole 111 is 1.5 to 5 mm. Specifically, a support frame is installed inside the stripping box 1, and the two ends of the support frame are installed on the inner wall of the stripping box 1. The steam distribution pipe 11 is located on the support frame, and the steam distribution pipe 11 is connected to the connecting plate 14 by steam welding.

[0038] This utility model also provides a high-salt, high-ammonia-nitrogen wastewater treatment device, including the stripping box 1, the stripping box 1 is provided with a gas phase outlet, the gas phase outlet is connected to a tail gas absorption device 2 through a pipeline, and a wastewater regulating device 3 is provided between the wastewater atomizing device 12 and the high-salt, high-ammonia-nitrogen wastewater inlet.

[0039] In an optional embodiment, an induced draft fan 5 is provided on the pipeline between the gas phase outlet and the tail gas absorption device 2.

[0040] In an optional embodiment, the wastewater conditioning device 3 is an inclined plate separator. A wastewater feed pump 6 is provided on the pipeline between the inclined plate separator and the wastewater atomizing device 12. A mixer 4 is connected to the pipeline at the end of the inclined plate separator away from the wastewater feed pump 6. The mixer 4 is connected to a high-salt, high-ammonia-nitrogen wastewater inlet and an alkaline solution inlet, respectively.

[0041] In a preferred embodiment, the stripping box 1 is provided with a liquid phase outlet, and the liquid phase outlet is connected to an evaporation device via a stripping wastewater extraction pump 7.

[0042] In this embodiment, the exhaust gas absorption device 2 is a circulating spray tower.

[0043] In this embodiment, the bottom of the circulating spray tower is connected to a tail gas absorption circulation pump 8, which returns the gas to the top of the tower through a pipeline. The top of the circulating spray tower is connected to a demineralized water pipeline.

[0044] The working principle is as follows:

[0045] High-salt, high-ammonia-nitrogen wastewater is mixed with alkaline solution through mixer 4 and then enters inclined plate separator to pre-separate impurities from the wastewater, adjusting the pH to 11.5–12. Driven by wastewater feed pump 6, the wastewater enters the main pipe 15 and rotating nozzle of stripping box 1 through pipeline, and is atomized and sprayed downwards through nozzles. Steam enters steam distribution pipe 11 through pipeline and escapes and rises through numerous distribution holes 111 on the upper surface of the steam distribution pipe 11, contacting the atomized high-salt, high-ammonia-nitrogen wastewater sprayed downwards, raising the temperature to 75–80°C. The water vapor and high ammonia-nitrogen... The wastewater mass ratio is 0.2 to 0.3. Steam strips the ammonia from the atomized high-salt, high-ammonia-nitrogen wastewater once. The gas after contact continues to rise and strips the atomized ammonia-nitrogen wastewater above a second time. The stripped gas enters the tail gas absorption device 2 through the gas phase outlet via the induced draft fan 5. Ammonia water is obtained through circulating spraying and recycled to the device. The stripped wastewater falls down through the wastewater downcomer channel 13 between the steam distribution pipes 11 and reaches the evaporation device to recover by-product salts through the liquid phase outlet of the stripping box 1 and driven by the stripped wastewater collection pump 7.

[0046] A specific example is as follows: Wastewater with an ammonia nitrogen content of 8000 mg / L is mixed with liquid alkali and the pH is adjusted to 11.5. The mixture is then pumped into a three-layer stripping chamber 1. The high ammonia nitrogen wastewater in the stripping chamber 1 is atomized by the atomizer at the outlet of the circulating pump and then comes into contact with the steam in the steam distribution pipe 11, which raises the temperature to 75°C. The gas after contact is then stripped a second time with the atomized ammonia nitrogen wastewater. The stripped gas enters the tail gas absorption device 2. The stripped wastewater is then pumped to an evaporation device to recover the by-product sodium chloride. The ammonia nitrogen content of the stripped wastewater is 50 mg / L. The steam distribution pipe 11 is a flat stainless steel pipe with a 3 mm orifice. The obtained ammonia gas is absorbed by water to form ammonia water with a concentration of 15%. 200 kg of steam is used per ton of wastewater.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blowout box, comprising a box body, characterized in that, The chamber is equipped with at least one set of steam atomization stripping components. The steam atomization stripping components include a wastewater atomizing device and a steam distribution pipe. The wastewater atomizing device is connected to a wastewater inlet and is located above the steam distribution pipe. The steam distribution pipe is connected to a steam source and has distribution holes on its wall. Wastewater downflow channels are provided between the steam distribution pipes.

2. The blow-off box according to claim 1, characterized in that, The wastewater atomizing device includes a rotating nozzle.

3. The blow-off box according to claim 2, characterized in that, The rotating nozzle includes a nozzle that is positioned downwards.

4. The blow-off box according to claim 1, characterized in that, The steam distribution pipe is a flat pipe, the steam distribution pipe is horizontally arranged, the distribution hole is located on the upper pipe wall of the steam distribution pipe, and the diameter of the distribution hole is 1.5 to 5 mm.

5. A device for treating high-salt, high-ammonia-nitrogen wastewater, characterized in that, The device includes a stripping box as described in any one of claims 1 to 4, wherein the stripping box is provided with a gas phase outlet, the gas phase outlet is connected to a tail gas absorption device via a pipeline, and a wastewater regulating device is provided between the wastewater atomizing device and the wastewater inlet.

6. The high-salt, high-ammonia-nitrogen wastewater treatment device according to claim 5, characterized in that, An induced draft fan is installed on the pipeline between the gas phase outlet and the tail gas absorption device.

7. The high-salt, high-ammonia-nitrogen wastewater treatment device according to claim 5, characterized in that, The wastewater regulating device is an inclined plate separator. A wastewater feed pump is installed on the pipeline between the inclined plate separator and the wastewater atomizing device. A mixer is connected to the pipeline at the end of the inclined plate separator away from the wastewater feed pump. The mixer is connected to a wastewater inlet and an alkali inlet.

8. The high-salt, high-ammonia-nitrogen wastewater treatment device according to claim 5, characterized in that, The stripping box is equipped with a liquid phase outlet, which is connected to an evaporation device via a stripping wastewater extraction pump.

9. The high-salt, high-ammonia-nitrogen wastewater treatment device according to any one of claims 5-8, characterized in that, The exhaust gas absorption device is a circulating spray tower.

10. The high-salt, high-ammonia-nitrogen wastewater treatment device according to claim 9, characterized in that, The bottom of the circulating spray tower is connected to a tail gas absorption and circulation pump, and the top of the circulating spray tower is connected to a demineralized water pipeline.

Images