Ultra-pure chemical production wastewater treatment system

Abstract

The utility model discloses an ultra-pure chemical production wastewater treatment system, and belongs to the technical field of ultra-pure chemical production. The ultra-pure chemical production wastewater treatment system comprises a wastewater pool, a neutralization and precipitation tank, a coagulation tank, an adsorption tank and a discharge pool which are connected in sequence, the neutralization and precipitation tank is communicated with a first dosing tank and used for adding a neutralization reagent into the neutralization and precipitation tank, the neutralization reagent and fluorine ions in wastewater are subjected to a chemical reaction to generate precipitates, and the precipitates are discharged from the first dosing tank. The coagulation tank is communicated with the second dosing tank and is used for adding a flocculation reagent into the coagulation tank, the flocculation reagent can adsorb fluorine ions and other salt ions in the wastewater, and finally, a filler area is arranged in the adsorption tank and can filter particulate matters and inorganic matters in the wastewater, so that the device not only can remove the fluorine ions more thoroughly and fully, but also can filter the inorganic matters in the wastewater. Particulate matters and other inorganic ions in the wastewater can be effectively removed.

Description

Technical Field

[0001] This application relates to the technical field of ultrapure chemical production, and specifically to a wastewater treatment system for ultrapure chemical production. Background Art

[0002] In the production process of some ultrapure chemicals, a large amount of wastewater containing hydrofluoric acid is generated. This wastewater will pollute the environment and needs to be treated to meet the standards before being discharged. The current conventional treatment solution is to use the chemical precipitation method, adding calcium salts, and using the chemical reaction between calcium ions and fluoride ions to generate calcium fluoride precipitation to remove fluoride ions in the wastewater. Calcium salts are relatively cheap and the operating cost is low, but the amount of slag generated is large. And if there are some other salts in the water, the solubility of calcium fluoride will increase, resulting in a low fluoride removal efficiency and the fluoride ions in the wastewater cannot meet the discharge standards. Summary of the Invention

[0003] The purpose of this application is to provide a wastewater treatment system for ultrapure chemical production, so as to solve the technical problems existing in the above background art to at least a certain extent.

[0004] To achieve the above purpose, this application provides the following technical solution: A wastewater treatment system for ultrapure chemical production, the treatment system includes:

[0005] A wastewater tank,

[0006] A neutralization precipitation tank, provided with an inlet pipe and an outlet pipe, the inlet pipe of the neutralization precipitation tank is communicated with the wastewater tank, and the neutralization precipitation tank is provided with a chemical addition pipe;

[0007] A first chemical addition tank, communicated with the chemical addition pipe of the neutralization precipitation tank, and there is a neutralization reagent in the first chemical addition tank;

[0008] A coagulation tank, provided with an inlet pipe and an outlet pipe, the inlet pipe of the coagulation tank is communicated with the outlet pipe of the neutralization precipitation tank, and the coagulation tank is provided with a chemical addition pipe;

[0009] A second chemical addition tank, communicated with the chemical addition pipe of the coagulation tank, and there is a flocculation reagent in the second chemical addition tank;

[0010] An adsorption tank, provided with an inlet pipe at the top and an outlet pipe at the bottom, the inlet pipe of the adsorption tank is communicated with the outlet pipe of the coagulation tank, and a packing area is filled and arranged in the adsorption tank;

[0011] A discharge tank, communicated with the outlet pipe of the adsorption tank.

[0012] Furthermore, the neutralization reagent in the first chemical addition tank is one of iron hydroxide, calcium hydroxide and magnesium oxide.

[0013] Further, the neutralizing reagent is calcium hydroxide.

[0014] Further, the flocculating reagent is polyaluminum chloride.

[0015] Further, the packing area includes an activated carbon area in the upper layer and a resin area in the lower layer, and there is a gap between the activated carbon area and the resin area.

[0016] Further, the activated carbon filled in the activated carbon area is granular, and the particle diameter of the activated carbon gradually decreases from top to bottom.

[0017] Further, a return pipe is further included. One end of the return pipe is communicated with the liquid outlet pipe of the adsorption tank, and the other end is communicated with the liquid inlet pipe of the neutralization sedimentation tank.

[0018] Compared with the prior art, the beneficial effects of the present application at least include:

[0019] Since a wastewater treatment system for ultra-pure chemical production provided by the present application includes a wastewater tank, a neutralization sedimentation tank, a coagulation tank, an adsorption tank, and a discharge tank connected in sequence, wherein the neutralization sedimentation tank is communicated with a first chemical addition tank for adding a neutralizing reagent into the neutralization sedimentation tank, and the neutralizing reagent reacts chemically with fluoride ions in the wastewater to generate precipitates, the coagulation tank is communicated with a second chemical addition tank for adding a flocculating reagent into the coagulation tank, and the flocculating reagent can adsorb fluoride ions and other salt ions in the wastewater. Finally, a packing area is arranged in the adsorption tank, which can filter particulate matters and inorganic substances in the wastewater. Therefore, in this device, not only the removal of fluoride ions is more thorough and sufficient, but also particulate matters and other inorganic ions in the wastewater can be effectively removed. Description of the Drawings

[0020] Figure 1 is the wastewater treatment flow chart of the present application;

[0021] Figure 2 is the structural schematic diagram of the adsorption tank of the present application. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part 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 efforts shall fall within the protection scope of the present application.

[0023] The present application provides a wastewater treatment system for ultra-pure chemical production, in combination with Figure 1-2 , including:

[0024] Wastewater tank 1

[0025] Neutralization and precipitation tank 2, equipped with an inlet pipe and an outlet pipe. The inlet pipe of the neutralization and precipitation tank 2 is connected to the wastewater tank 1, and the neutralization and precipitation tank 2 is provided with a chemical addition pipe.

[0026] The first chemical addition tank 6 is connected to the chemical addition pipe of the neutralization and precipitation tank 2, and there is a neutralization reagent in the first chemical addition tank 6.

[0027] Coagulation tank 3, equipped with an inlet pipe and an outlet pipe. The inlet pipe of the coagulation tank 3 is connected to the outlet pipe of the neutralization and precipitation tank 2, and the coagulation tank 3 is provided with a chemical addition pipe.

[0028] The second chemical addition tank 7 is connected to the chemical addition pipe of the coagulation tank 3, and there is a flocculation reagent in the second chemical addition tank 7.

[0029] Adsorption tank 4, equipped with an inlet pipe at the top and an outlet pipe at the bottom. The inlet pipe of the adsorption tank 4 is connected to the outlet pipe of the coagulation tank 3, and a packing area 8 is filled and arranged in the adsorption tank 4.

[0030] Discharge tank 5 is connected to the outlet pipe of the adsorption tank 4.

[0031] In this device, first, the neutralization reagent is added into the neutralization and precipitation tank 2 through the first chemical addition tank 6. The neutralization reagent reacts chemically with the fluoride ions in the wastewater to generate solid precipitates and separate them from the wastewater. Secondly, the wastewater with most of the fluoride ions removed is transported to the coagulation tank 3 through pipelines. The flocculation reagent is added into the coagulation tank 3. The flocculation reagent plays an adsorption role on the fluoride ions, further removing the fluoride ions, and at the same time, it can also remove other ions in the wastewater. Thirdly, the packing area 8 in the adsorption tank 4 can effectively adsorb the solid particle impurities and other inorganic ions mixed in the wastewater. Finally, the more fully purified wastewater enters the discharge tank 5 and waits to be discharged into the municipal sewage pipe network.

[0032] In one embodiment, the neutralization reagent in the first chemical addition tank 6 is one of iron hydroxide, calcium hydroxide, and magnesium oxide.

[0033] In one embodiment, the neutralization reagent is calcium hydroxide. Calcium hydroxide reacts with the fluoride in the water to form calcium fluoride precipitate, thus playing a role in removing the fluoride ions in the wastewater.

[0034] In one embodiment, the flocculation reagent is polyaluminum chloride. Polyaluminum chloride forms flocs in water and has functions such as ligand exchange, physical adsorption, and sweeping on the fluoride ions.

[0035] In one embodiment, the packing area 8 includes an activated carbon area 81 in the upper layer and a resin area 82 in the lower layer, and there is a gap between the activated carbon area 81 and the resin area 82. The activated carbon area 81 can filter particulate impurities in the wastewater, and the resin can adsorb and remove other ionic impurities, so that the purification effect of the wastewater is better.

[0036] In one embodiment, the activated carbon filled in the activated carbon area 81 is granular, and the particle diameter of the activated carbon gradually decreases from top to bottom, so that the filtering effect of the activated carbon area is better.

[0037] In one embodiment, a liquid return pipe 9 is further included. One end of the liquid return pipe 9 is communicated with the liquid outlet pipe of the adsorption tank 4, and the other end is communicated with the liquid inlet pipe of the neutralization precipitation tank 2. The liquid return pipe is provided in this device to avoid circulating treatment when the wastewater treatment is unqualified.

[0038] It should be noted that pumps for providing power and valves for controlling the flow of waste liquid are provided on the pipelines of this device. Installing pumps, valves, and instruments on the pipelines in chemical device treatment to ensure safe operation is a conventional technical means.

[0039] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0040] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application 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, and therefore should not be construed as a limitation to this application.

[0041] It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0042] In the present application, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral body; 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 communication inside 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 application can be understood according to specific circumstances.

[0043] In addition, in the present application, descriptions such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0045] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0046] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A treatment system for the production wastewater of ultra-pure chemicals, characterized in that, The processing system includes: a wastewater tank (1), a neutralization sedimentation tank (2) provided with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe of the neutralization sedimentation tank (2) being communicated with the wastewater tank (1), and the neutralization sedimentation tank (2) being provided with a chemical addition pipe; a first chemical addition tank (6) communicated with the chemical addition pipe of the neutralization sedimentation tank (2), and there being a neutralization reagent in the first chemical addition tank (6); a coagulation tank (3) provided with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe of the coagulation tank (3) being communicated with the liquid outlet pipe of the neutralization sedimentation tank (2), and the coagulation tank (3) being provided with a chemical addition pipe; a second chemical addition tank (7) communicated with the chemical addition pipe of the coagulation tank (3), and there being a flocculation reagent in the second chemical addition tank (7); an adsorption tank (4) provided with a liquid inlet pipe at the top and a liquid outlet pipe at the bottom, the liquid inlet pipe of the adsorption tank (4) being communicated with the liquid outlet pipe of the coagulation tank (3), and a packing area (8) being filled and arranged in the adsorption tank (4); a discharge tank (5) communicated with the liquid outlet pipe of the adsorption tank (4).

2. The ultra-pure chemical production wastewater treatment system according to claim 1, wherein The neutralization reagent in the first chemical addition tank (6) is one of iron hydroxide, calcium hydroxide and magnesium oxide.

3. The ultra-pure chemical production wastewater treatment system according to claim 2, characterized in that, The neutralization reagent is calcium hydroxide.

4. The ultra-pure chemical production wastewater treatment system according to claim 1, wherein The flocculation reagent is polyaluminum chloride.

5. The ultra-pure chemical production wastewater treatment system according to claim 1, wherein, The packing area (8) includes an activated carbon area (81) in the upper layer and a resin area (82) in the lower layer, and there is a gap between the activated carbon area (81) and the resin area (82).

6. The ultra-pure chemical production wastewater treatment system according to claim 5, characterized in that, The activated carbon filled in the activated carbon area (81) is in granular form, and the particle diameter of the activated carbon gradually decreases from top to bottom.

7. The ultra-pure chemical production wastewater treatment system according to claim 1, characterized in that, A return liquid pipe (9) is further included, one end of the return liquid pipe (9) being communicated with the liquid outlet pipe of the adsorption tank (4), and the other end thereof being communicated with the liquid inlet pipe of the neutralization sedimentation tank (2).

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