Iodine-containing industrial wastewater treatment system

Abstract

The utility model discloses an iodine-containing industrial wastewater treatment system which comprises a wastewater adjusting tank, a quartz sand filter, a first laminated filter, a special resin bed, a water tank, a sewage biochemical system, a desorption solution raw material tank, a desorption solution collecting tank, a deep desorption solution tank, a deep desorption solution collecting tank, a desorption solution temporary storage tank and a membrane concentration system, the wastewater adjusting tank is connected with the quartz sand filter, the quartz sand filter is connected with the first laminated filter, the first laminated filter is connected with the special resin bed, and the special resin bed is also respectively connected with a deep desorption solution collecting tank, a desorption solution collecting tank, a desorption solution raw material tank and a deep desorption solution tank. Through a series of procedures such as the quartz sand filter and the special resin bed, iodide ions in wastewater generated in the acetic acid production process can be effectively adsorbed, the beneficial effect of reducing the treatment cost is achieved, free iodide ions in the wastewater are adsorbed and concentrated, and a powerful guarantee is provided for subsequent recovery of the iodide ions.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an iodine-containing industrial wastewater treatment system. Background Technique

[0002] At present, the commonly used iodine recovery methods include ion exchange method, air stripping method, extraction method, activated carbon adsorption method, precipitation method, etc. In recent years, new methods such as liquid membrane separation method and solvent flotation method have emerged.

[0003] With the rapid development of the economy, the demand for iodine in China has also increased. However, due to technical limitations, the output of iodine is not high, while the cost is very high. Every year, a large amount of iodine needs to be imported from abroad to meet the demand. If suitable methods are selected to recover iodine, the iodine-deficient situation in China will surely be improved. Therefore, while adopting practical and effective technologies to recover iodine, advanced foreign iodine production technologies and devices can be appropriately introduced to better develop and utilize China's iodine resources.

[0004] In the current acetic acid production process, the methanol carbonylation reaction is used as the production process, and a certain amount of hydroiodic acid is used as an auxiliary agent during the production process. Since the iodine in the wastewater cannot be effectively recycled and utilized, it causes a waste of resources. For this reason, an iodine-containing industrial wastewater treatment system is proposed. Content of the Utility Model

[0005] (I) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides an iodine-containing industrial wastewater treatment system, which solves the problem that: due to the inability to effectively recycle and utilize the iodine in the wastewater at present, it causes a waste of resources. By setting a series of processes such as a quartz sand filter and a special resin bed, the utility model can effectively adsorb the iodine ions in the wastewater generated during the acetic acid production process, ensuring that the iodine ion content entering the sewage biochemical system is less than 3 ppm, which has the beneficial effect of reducing the treatment cost, and can perfectly cooperate with the sewage biochemical treatment system to adsorb and concentrate the free iodine ions in the wastewater, providing a strong guarantee for the subsequent recovery of iodine ions.

[0007] (II) Technical Solutions

[0008] To achieve the above objectives, the present utility model is realized through the following technical solutions: An iodine-containing industrial wastewater treatment system includes a wastewater regulation tank, a quartz sand filter, a first stacked filter, a special resin bed, a water tank, a sewage biochemical system, an analytical solution raw material tank, an analytical solution collection tank, a deep analytical solution tank, a deep analytical solution collection tank, an analytical solution temporary storage tank, and a membrane concentration system. The wastewater regulation tank is connected to the quartz sand filter, the quartz sand filter is connected to the first stacked filter, the first stacked filter is connected to the special resin bed. The special resin bed is also respectively connected to the deep analytical solution collection tank, the analytical solution collection tank, the analytical solution raw material tank, and the deep analytical solution tank. A water tank is connected between the special resin bed and the sewage biochemical system. The deep analytical solution collection tank and the analytical solution collection tank are respectively connected to the analytical solution temporary storage tank. The analytical solution temporary storage tank is also connected to the membrane concentration system, and the membrane concentration system is also connected to the analytical solution raw material tank.

[0009] As a further preferred embodiment of the present utility model, a second stacked filter is provided between the special resin bed and the water tank, and a secondary resin bed is also connected between the water tank and the sewage biochemical system.

[0010] As a further preferred embodiment of the present utility model, the first stacked filter includes 18 - 32 filtering points, and the second stacked filter has the same structure as the first stacked filter.

[0011] As a further preferred embodiment of the present utility model, a first regulating valve is also provided between the first stacked filter and the special resin bed, and a second regulating valve is provided between the secondary resin bed and the water tank.

[0012] As a further preferred embodiment of the present utility model, a third regulating valve is provided between the deep analytical solution collection tank and the special resin bed, a fourth regulating valve is provided between the analytical solution collection tank and the special resin bed, a fifth regulating valve is provided between the analytical solution raw material tank and the special resin bed, and a sixth regulating valve is provided between the deep analytical solution tank and the special resin bed.

[0013] (III) Beneficial effects

[0014] The present utility model provides an iodine-containing industrial wastewater treatment system, which has the following beneficial effects:

[0015] By setting a series of processes such as a quartz sand filter and a special resin bed, the present utility model can effectively adsorb iodide ions in the wastewater generated during the acetic acid production process, ensuring that the iodide ion content entering the sewage biochemical system is less than 3 ppm, achieving the beneficial effect of reducing the treatment cost. It can perfectly cooperate with the sewage biochemical treatment system to adsorb and concentrate the free iodide ions in the wastewater, providing a strong guarantee for the subsequent recovery of iodide ions, and at the same time avoiding the destruction of the strains in the sewage biochemical treatment system. Description of the drawings

[0016] Figure 1 This is a schematic diagram of the iodine-containing industrial wastewater treatment system of the present utility model.

[0017] In the figure: wastewater regulation tank - 1, quartz sand filter - 2, first stack filter - 3, special resin bed - 4, water tank - 5, sewage biochemical system - 6, analytical solution raw material tank - 7, analytical solution collection tank - 8, deep analytical solution tank - 9, deep analytical solution collection tank - 10, analytical solution temporary storage tank - 11, membrane concentration system - 12, second stack filter - 13, secondary resin bed - 14, first regulating valve - 15, second regulating valve - 16, third regulating valve - 17, fourth regulating valve - 18, fifth regulating valve - 19, sixth regulating valve - 20. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Please refer to Figure 1 , an embodiment of the present utility model provides a technical solution: an iodine-containing industrial wastewater treatment system, including a wastewater regulation tank 1, a quartz sand filter 2, a first stack filter 3, a special resin bed 4, a water tank 5, a sewage biochemical system 6, an analytical solution raw material tank 7, an analytical solution collection tank 8, a deep analytical solution tank 9, a deep analytical solution collection tank 10, an analytical solution temporary storage tank 11, and a membrane concentration system 12. The wastewater regulation tank 1 is connected to the quartz sand filter 2, the quartz sand filter 2 is connected to the first stack filter 3, the first stack filter 3 is connected to the special resin bed 4, the special resin bed 4 is also respectively connected to the deep analytical solution collection tank 10, the analytical solution collection tank 8, the analytical solution raw material tank 7, and the deep analytical solution tank 9. A water tank 5 is connected between the special resin bed 4 and the sewage biochemical system 6. The deep analytical solution collection tank 10 and the analytical solution collection tank 8 are respectively connected to the analytical solution temporary storage tank 11. The analytical solution temporary storage tank 11 is also connected to the membrane concentration system 12, and the membrane concentration system 12 is also connected to the analytical solution raw material tank 7.

[0020] Further improved, a second stack filter 13 is provided between the special resin bed 4 and the water tank 5. A secondary resin bed 14 is also connected between the water tank 5 and the sewage biochemical system 6. By providing the second stack filter 13, the wastewater is further filtered and purified. In cooperation with the secondary resin bed 14 between the water tank 5 and the sewage biochemical system 6, it is ensured that subsequent detections are not interfered by impurities, protecting the detection equipment. The resin bed can make the resin reusable through the regeneration and recycling process, reducing the cost of wastewater treatment and resource waste.

[0021] Further improved, the first stack filter 3 includes 18 - 32 filtering points. The second stack filter 13 has the same structure as the first stack filter 3. By providing more filtering points in the first stack filter 3, the impurities in the wastewater can be maximally removed, improving the effect of rough filtration of the wastewater.

[0022] Further improved, a first regulating valve 15 is also provided between the first stack filter 3 and the special resin bed 4, and a second regulating valve 16 is provided between the secondary resin bed 14 and the water tank 5. By providing the first regulating valve 15, it is convenient to adjust and control the flow rate and flow volume between the first stack filter 3 and the special resin bed 4. In cooperation with the second regulating valve 16 between the secondary resin bed 14 and the water tank 5, the convenience of controlling the adsorption treatment of wastewater is improved.

[0023] Specifically improved, a third regulating valve 17 is provided between the deep analysis liquid collection tank 10 and the special resin bed 4, a fourth regulating valve 18 is provided between the analysis liquid collection tank 8 and the special resin bed 4, a fifth regulating valve 19 is provided between the analysis liquid raw material tank 7 and the special resin bed 4, and a sixth regulating valve 20 is provided between the deep analysis liquid tank 9 and the special resin bed 4. By providing multiple regulating valves, it is convenient to control the speed and steps of wastewater analysis and purification, facilitating adjustment and maintenance in actual operation.

[0024] When the utility model is in operation, waste water with different iodine concentrations is collected in the waste water regulating tank 1, and the iodine ion content is measured by on-line analysis and balanced to less than 500 ppm. At this time, the first regulating valve 15 is opened, and the waste water enters the quartz sand filter 2 and the first stack filter 3 in sequence. The quartz sand filter 2 filters the waste water for the first time, and the first stack filter 3 filters the waste water for the second time. The waste water filtered twice enters the special resin bed 4, and the special resin bed 4 performs targeted adsorption of iodine ions on the waste water filtered twice. When the second stack filter 13 is set, the waste water after targeted adsorption of iodine ions enters the second stack filter 13 from the special resin bed 4 for re-filtration to ensure that subsequent detection is not interfered by impurities and to protect the detection equipment. The waste water enters the water tank 5 and the waste water is detected. If the iodine ion content in the waste water is less than or equal to 3 ppm, it is directly discharged and enters the sewage biochemical system 6; if the iodine ion content in the waste water is greater than 3 ppm, it means that the resin in the special resin bed 4 has been saturated with adsorption. At this time, the first regulating valve 15 is closed. When the secondary resin bed 14 is set, the second regulating valve 16 should also be opened at this time. The waste water with an iodine ion content greater than 3 ppm enters the secondary resin bed 14 for secondary adsorption to provide secondary protection to ensure that the iodine ion content in the waste water entering the sewage biochemical system 6 is less than or equal to 3 ppm; when the resin bed of the special resin bed 4 reaches saturation with adsorption, the resin bed analysis process is started, the fifth regulating valve 19 and the fourth regulating valve 18 are opened, and the sodium salt analysis liquid with a mass concentration of 1-3% in the analysis liquid raw material tank 7 is pressed into the special resin bed 4 for analysis to enrich the iodine ion mass concentration to 0.2-0.25%. The enriched analysis liquid enters the analysis liquid collection tank 8 and finally enters the analysis liquid temporary storage tank 11; the fifth regulating valve 19 and the fourth regulating valve 18 are closed, the third regulating valve 17 and the sixth regulating valve 20 are opened, and the sodium salt deep analysis liquid with a mass concentration of 5-8% is pressed into the special resin bed 4 from the deep analysis liquid tank 9 for deep analysis and regeneration of the resin. The analysis liquid with an iodine ion mass concentration of 0.2-0.25% after deep analysis is sent to the deep analysis liquid collection tank 10 and finally sent to the analysis liquid temporary storage tank 11; the analysis liquid in the analysis liquid temporary storage tank 11 enters the membrane concentration system 12 for concentration, and the analysis liquid with an iodine ion mass concentration of 0.2-0.25% is concentrated to an iodine-containing solution with an iodine ion mass concentration of 5%. During this process, a sodium hydroxide solution with a mass concentration of 2-5% is intermittently added to adjust the Ph value to precipitate some sodium salt solids. The supernatant returns to the membrane system for secondary concentration, and the generated solid sodium salt returns to the analysis liquid raw material tank 7 for reuse. Finally, the iodine-containing solution with a mass concentration of 5% enters the iodine recovery process.

[0025] The problem solved by the present utility model: In the current acetic acid production process, the methanol carbonylation reaction is used as the production process, and a certain amount of hydroiodic acid is used as an auxiliary agent during the production process. Since the iodine in the wastewater cannot be effectively recycled and utilized, it causes waste of resources. The present utility model can effectively adsorb the iodide ions in the wastewater generated during the acetic acid production process by setting a series of processes such as a quartz sand filter 2 and a special resin bed 4, ensuring that the iodide ion content entering the sewage biochemical treatment system 6 is less than 3 ppm, achieving the beneficial effect of reducing the treatment cost. It can perfectly cooperate with the sewage biochemical treatment system, adsorb and concentrate the free iodide ions in the wastewater, providing a strong guarantee for the subsequent recovery of iodide ions, and at the same time preventing the destruction of the bacteria in the sewage biochemical treatment system.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model.

[0027] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0028] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "set", "connected", "fixed", "swiveling connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An iodine-containing industrial wastewater treatment system, comprising a wastewater regulating tank (1), a quartz sand filter (2), a first laminated filter (3), a special resin bed (4), a water tank (5), a sewage biochemical system (6), an analytical solution raw material tank (7), an analytical solution collecting tank (8), a deep analytical solution tank (9), a deep analytical solution collecting tank (10), an analytical solution temporary storage tank (11) and a membrane concentration system (12), characterized in that: The wastewater regulating tank (1) is connected to a quartz sand filter (2), the quartz sand filter (2) is connected to a first laminated filter (3), the first laminated filter (3) is connected to a special resin bed (4), the special resin bed (4) is also respectively connected to a deep analytical liquid collection tank (10), an analytical liquid collection tank (8), an analytical liquid raw material tank (7) and a deep analytical liquid tank (9), a water tank (5) is connected between the special resin bed (4) and the sewage biochemical system (6), the deep analytical liquid collection tank (10) and the analytical liquid collection tank (8) are respectively connected to an analytical liquid temporary storage tank (11), the analytical liquid temporary storage tank (11) is also connected to a membrane concentration system (12), and the membrane concentration system (12) is also connected to an analytical liquid raw material tank (7).

2. A iodine-containing industrial wastewater treatment system according to claim 1, characterized in that: A second laminated filter (13) is arranged between the special resin bed (4) and the water tank (5), and a secondary resin bed (14) is also connected between the water tank (5) and the sewage biochemical system (6).

3. A iodine-containing industrial wastewater treatment system according to claim 2, characterized in that: The first laminated filter (3) comprises 18-32 filtering points, and the second laminated filter (13) has the same structure as the first laminated filter (3).

4. A iodine-containing industrial wastewater treatment system according to claim 3, characterized in that: A first regulating valve (15) is also provided between the first laminated filter (3) and the special resin bed (4), and a second regulating valve (16) is provided between the secondary resin bed (14) and the water tank (5).

5. A iodine-containing industrial wastewater treatment system according to claim 1, characterized in that: A third regulating valve (17) is arranged between the deep analysis liquid collection tank (10) and the special resin bed (4), a fourth regulating valve (18) is arranged between the analysis liquid collection tank (8) and the special resin bed (4), a fifth regulating valve (19) is arranged between the analysis liquid raw material tank (7) and the special resin bed (4), and a sixth regulating valve (20) is arranged between the deep analysis liquid tank (9) and the special resin bed (4).

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