A kind of pH adjusting kettle for monosodium salt production wastewater

Abstract

The present disclosure relates to the technical field of pH adjusting kettle, and one embodiment of the present disclosure provides a pH adjusting kettle for monosodium salt production wastewater, which comprises a kettle body, a feeding port and a top cover, the feeding port is arranged on the outer wall of the kettle body, the top cover is arranged on the top of the kettle body, a connecting assembly is arranged between the kettle body and the top cover, a stirring monitoring assembly is arranged in the kettle body, and a deodorizing assembly is arranged on the top cover; the connecting assembly comprises an outer seat fixed on the outer wall of the kettle body, and the top cover is rotationally connected in the outer seat through a rotating shaft; one end of the rotating shaft of the top cover is provided with a worm gear, a worm is arranged outside the kettle body and rotates through electric power, and the worm is engaged with the worm gear. Through the above technical scheme, the technical problem that the existing pH adjusting kettle is mostly of a whole sealing structure, salt scale and reagent precipitate are easily left in the kettle after long-term use, a large number of connecting components need to be disassembled when the kettle is opened and cleaned, and the operation is complex and time-consuming is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of pH adjustment vessels, specifically to a pH adjustment vessel for monosodium salt production wastewater. Background Technology

[0002] In the production of monosodium salts (such as sodium chloride and sodium sulfate), wastewater with high salt, acidity, or alkalinity is generated. Direct discharge of this wastewater would pollute the environment. Therefore, it is necessary to adjust the pH value of the wastewater to the acceptable range using a pH adjustment vessel by adding acidic or alkaline reagents. This is the core step in the environmental protection treatment of monosodium salt production wastewater. The structural rationality and functional integrity of the pH adjustment vessel used for monosodium salt production wastewater directly determine the wastewater treatment efficiency and environmental compliance. With increasingly stringent environmental requirements and the expansion of monosodium salt production capacity, the shortcomings of traditional adjustment vessels are becoming increasingly apparent: existing pH adjustment vessels are mostly integral sealed structures, which easily accumulate salt scale and reagent precipitates after long-term use. Opening and cleaning requires disassembling a large number of connecting parts, making the operation complex and time-consuming. Simultaneously, the reaction between wastewater and reagents during the adjustment process easily produces acidic or alkaline gases (such as hydrogen chloride and ammonia). Traditional adjustment vessels lack gas treatment capabilities, and direct emission of these gases would corrode equipment and pollute the workshop environment, making it difficult to meet efficient treatment and environmental protection requirements. Traditional integrated regulating reactors have small inlet and inspection ports, requiring operators to use tools to reach deep inside for cleaning. This is not only labor-intensive but also poses safety hazards due to the confined space. Furthermore, cleaning requires completely emptying the reactor of wastewater and disassembling pipes, valves, and other components, interrupting the wastewater treatment process for several hours and severely impacting continuous wastewater treatment workflows. In addition, direct emission of harmful gases produced during the reaction can irritate operators' respiratory tracts and corrode workshop equipment over time. While some companies install exhaust fans, these only dilute and disperse the gases, failing to fundamentally eliminate pollution and still posing environmental compliance risks.

[0003] Therefore, the development of a pH adjustment vessel for monosodium salt production wastewater that is easy to clean and can effectively treat reaction gases has become an urgent need to improve wastewater treatment efficiency and environmental friendliness. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a pH adjusting vessel for monosodium salt production wastewater, which solves the technical problem that existing pH adjusting vessels are mostly integral sealed structures, which easily leave salt scale and reagent precipitates inside the vessel after long-term use, and require disassembly of a large number of connecting parts for cleaning, making the operation complicated and time-consuming.

[0005] According to one aspect, at least one embodiment of this disclosure provides a pH adjusting vessel for monosodium salt production wastewater, comprising: The vessel body, the feed inlet, and the top cover are provided, with the feed inlet located on the outer wall of the vessel body and the top cover located on the top of the vessel body. A connecting component is disposed between the vessel body and the top cover; A stirring monitoring component is disposed in the vessel body; Odor removal component, wherein the odor removal component is disposed on the top cover; The connecting assembly includes an outer seat, which is fixed to the outer wall of the vessel body. The top cover is rotatably connected to the outer seat via a rotating shaft. One end of the rotating shaft of the top cover is provided with a worm gear. A worm that is driven to rotate by electricity is provided on the outer side of the vessel body. The worm gear meshes with the worm gear.

[0006] As a further technical solution, both ends of the top cover and the outer surface of the vessel are provided with raised layers, and the raised layers are fixedly connected by bolts. The top of the vessel is provided with a boss, and an adding tube is installed on the boss. A groove is provided on one side of the top of the top cover, and the groove corresponds to the position of the boss.

[0007] According to another aspect, in at least one embodiment of the present invention, the deodorizing component includes a gas collection hood, which is installed inside the top of the top cover. A suction fan is provided on the top of the top cover, and the suction end of the suction fan is connected to the gas collection hood.

[0008] As a further technical solution, an outer frame is installed on the top of the top cover, and a purification filter element is installed on the outer frame. The purification filter element is inserted and connected to the exhaust end of the suction fan.

[0009] According to another aspect, in at least one embodiment of the present invention, the stirring monitoring component includes a first stirring frame installed at the bottom of the vessel body, a second stirring frame that is electrically driven to rotate is installed on one side of the inner wall of the vessel body, and a pH monitoring head is installed inside the outer wall of the vessel body.

[0010] As a further technical solution, the first stirring rack is installed at an inclined angle, and the second stirring rack is located on one side of the first stirring rack.

[0011] As a further technical solution, the pH monitoring head is located directly above the second stirring rack.

[0012] As a further technical solution, a sealing layer is provided around the bottom of the top cover, and the outer side of the sealing layer that fits into the vessel body is an inclined structural surface.

[0013] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the connecting assembly, through its convenient opening and closing and double-sealing design, solves the problems of traditional regulating vessel cleaning requiring the disassembly of numerous components and cumbersome operations. The worm gear and worm wheel mesh to drive the top cover to flip, enabling rapid opening of the vessel without disassembling complex structures, significantly shortening cleaning preparation time. The raised bolt fixing and the engagement of the boss and groove form a double seal, which, together with the sealing layer at the bottom of the top cover, ensures no leakage of wastewater and odors, avoiding environmental pollution and reagent waste. The inclined contact surface of the sealing layer increases the contact area, further improving sealing performance. The addition tube allows for reagent addition when the top cover is closed, reducing operational steps. This structure ensures both the sealing and safety of the regulating operation, simplifies the cleaning process, reduces equipment downtime, and meets the continuous treatment requirements of sodium salt production wastewater. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0015] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure; Figure 2 This is an isometric drawing of the present disclosure; Figure 3 This is an isometric sectional view of the present disclosure; In the diagram: 1. Kettle body; 2. Feed inlet; 3. Top cover; 4. Connecting assembly; 4-1. Outer seat; 4-2. Worm gear; 4-3. Worm; 4-4. Raised layer; 4-5. Boss; 4-6. Adding pipe; 4-7. Groove; 5. Deodorizing assembly; 5-1. Gas collection hood; 5-2. Suction fan; 5-3. Outer frame; 5-4. Purification filter element; 6. Stirring monitoring assembly; 6-1. First stirring rack; 6-2. Second stirring rack; 6-3. pH monitoring head; 7. Sealing layer. Detailed Implementation

[0016] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0017] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0018] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0019] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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 disclosure.

[0021] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] like Figures 1-3 As shown, it illustrates a pH adjustment vessel for monosodium salt production wastewater in one embodiment of this disclosure, comprising: The vessel body 1, the feed inlet 2, and the top cover 3 are provided. The feed inlet 2 is located on the outer wall of the vessel body 1, and the top cover 3 is located on the top of the vessel body 1. Connection component 4 is disposed between the vessel body 1 and the top cover 3; A stirring monitoring component 6 is disposed in the vessel body 1; Odor removal component 5, which is disposed on the top cover 3; The connecting assembly 4 includes an outer seat 4-1, which is fixed to the outer wall of the vessel body 1. The top cover 3 is rotatably connected to the outer seat 4-1 via a rotating shaft. A worm gear 4-2 is provided at one end of the rotating shaft of the top cover 3. A worm 4-3 driven by electricity is provided on the outer side of the vessel body 1. The worm 4-3 meshes with the worm gear 4-2. Both ends of the outer surface of the top cover 3 and the vessel body 1 are provided with protrusions 4-4, which are fixedly connected by bolts. A boss 4-5 is provided on the top of the vessel body 1. An adding tube 4-6 is installed on the boss 4-5. A groove 4-7 is provided on one side of the top of the top cover 3, and the groove 4-7 corresponds to the position of the boss 4-5.

[0023] In some examples, to achieve rapid opening and closing and stable sealing between the top cover 3 and the vessel body 1, and to prevent leakage or impurities from entering during wastewater adjustment, a connecting component 4 is designed. This component includes an outer seat 4-1 fixed to the outer wall of the vessel body 1 to provide rotational support for the top cover 3. The top cover 3 is rotatably connected to the outer seat 4-1 via a rotating shaft. A worm gear 4-2 at one end of the rotating shaft meshes with a worm 4-3 electrically driven on the outside of the vessel body 1, forming a reduction transmission mechanism. When the worm 4-3 drive device is activated, the top cover 3 can be rotated around the rotating shaft via the worm gear 4-2, realizing rapid opening (for easy maintenance or cleaning) and closing (ensuring sealing during adjustment operations) of the vessel body 1. The self-locking characteristics of the worm gear 4-2 and worm 4-3 ensure that the top cover 3 can remain stably stopped at any opening angle, preventing automatic closing or opening due to gravity and improving operational safety. The top cover 3 and the raised layers 4-4 on both ends of the outer surface of the vessel body 1 are fixedly connected by bolts to form the main sealing and fixing structure. The even distribution of bolts ensures that the top cover 3 and the vessel body 1 fit tightly to prevent leakage of wastewater or regulating agents. The boss 4-5 on the top of the vessel body 1 corresponds to the groove 4-7 on one side of the top of the top cover 3. When the top cover 3 is closed, the boss 4-5 is embedded in the groove 4-7 to form an auxiliary sealing structure, which further enhances the sealing performance between the top cover 3 and the vessel body 1. At the same time, it plays a positioning role to ensure that the top cover 3 is accurately aligned when closed and avoids sealing failure due to misalignment.

[0024] In addition, the addition tube 4-6 installed on the top of the boss 4-5 can add pH adjuster into the vessel body 1 when the top cover 3 is closed, without having to open the top cover 3, reducing odor leakage and impurity entry, and improving the ease of operation. During operation, the worm gear 4-3 drives the worm wheel 4-2 to open the top cover 3. After maintenance or cleaning, the reverse drive closes the top cover 3. The protrusion 4-4 is fixed by bolts, and the boss 4-5 fits into the groove 4-7 for sealing. During adjustment, chemicals are added through the addition pipe 4-6. Rapid opening and closing improves operational efficiency, and double sealing ensures protection. All components work together to achieve safe and sealed operation of the vessel 1, meeting the pH adjustment requirements of wastewater.

[0025] like Figures 1-3 As shown in the figure, the deodorizing component 5 proposed in this embodiment includes a gas collection hood 5-1, which is installed inside the top of the top cover 3. A suction fan 5-2 is provided on the top of the top cover 3. The suction end of the suction fan 5-2 is connected to the gas collection hood 5-1. An outer frame 5-3 is installed on the top of the top cover 3. A purification filter element 5-4 is installed on the outer frame 5-3. The purification filter element 5-4 is inserted and connected to the exhaust end of the suction fan 5-2.

[0026] In some examples, in order to efficiently collect and purify the odors generated during the operation of the vessel 1 and prevent the odors from spreading and polluting the environment or endangering the health of the operators, an odor removal component 5 is designed. This component includes a funnel-shaped gas collection hood 5-1 installed on the top of the top cover 3, which can accurately cover the space above the interior of the vessel 1 to collect the odors generated during the pH adjustment of wastewater (such as chemical reactions and wastewater volatilization) and prevent the odors from escaping from the gaps in the top cover 3 or other parts. The suction fan 5-2 on the top of the top cover 3 provides power for the odor transport. Its suction end is directly connected to the gas collection hood 5-1, which can quickly suck in the odors in the gas collection hood 5-1 and transport them to the purification filter element 5-4.

[0027] The purification filter element 5-4 installed on the top cover 3 and the outer frame 5-3 is inserted and connected to the exhaust end of the suction fan 5-2. The filter element is filled with high-efficiency adsorption materials such as activated carbon and adsorption resin, which can adsorb and filter harmful components (such as volatile organic compounds and irritating gases) in odors, so that the purified gas meets the emission standards and reduces environmental pollution.

[0028] The plug-in connection design facilitates quick replacement of the purification filter 5-4, reducing maintenance costs and operational difficulty. The sealed installation of the odor collection hood 5-1 ensures thorough odor collection, and the adjustable fan speed of the exhaust fan 5-2 can adjust the suction intensity according to the amount of odor generated, balancing energy consumption and deodorization effect.

[0029] During operation, the suction fan 5-2 starts, and the odor inside the vessel 1 is collected by the gas collection hood 5-1, then transported by the fan to the purification filter element 5-4 for filtration before being discharged. Directional gas collection ensures that no odor escapes, and purification filtration achieves environmentally friendly emissions. All components work together to create a clean and safe production environment, meeting environmental protection requirements.

[0030] like Figures 1-3As shown in the figure, the stirring monitoring component 6 proposed in this embodiment includes a first stirring frame 6-1, which is installed at the bottom of the vessel body 1. A second stirring frame 6-2, which is driven to rotate by electricity, is installed on one side of the inner wall of the vessel body 1. A pH monitoring head 6-3 is installed inside the outer wall of the vessel body 1.

[0031] In some examples, in order to achieve uniform mixing of wastewater and regulator and dynamic monitoring of pH value, and to ensure accurate and controllable pH adjustment, a stirring monitoring component 6 was designed. This component includes a first stirring frame 6-1 installed at the bottom of the vessel body 1 to longitudinally stir the wastewater in the lower part of the vessel body 1, and a second stirring frame 6-2 electrically driven to rotate on one side of the inner wall of the vessel body 1 to laterally stir the wastewater in the middle and upper parts of the vessel body 1. The synergistic effect of the two stirring frames breaks the limitations of traditional single stirring, forming a three-dimensional stirring flow field, avoiding stratification of wastewater or local accumulation of reagents, ensuring that the regulator and wastewater are fully mixed, and improving the uniformity and efficiency of pH adjustment. The pH monitoring head 6-3 installed inside the outer wall of the vessel body 1 has its detection end extending into the wastewater area inside the vessel body 1. It can collect the pH data of the wastewater in real time and transmit it to the external control system. The operator can adjust the amount and speed of the regulator in a timely manner through data feedback to avoid the pH value deviating from the target range due to over- or under-adjustment.

[0032] The monitoring head is installed inside the outer wall of the vessel body 1, ensuring full contact between the detection end and the wastewater while preventing damage from collisions with the stirring frame during stirring, thus extending its service life. Furthermore, the corrosion-resistant design of the monitoring head can withstand the corrosiveness of monosodium phosphate wastewater, ensuring long-term stable monitoring. During operation, the dual agitator stirs the wastewater and conditioning agent, while the pH monitoring head 6-3 monitors and feeds back the data in real time. Operators adjust the dosing strategy based on this data. The three-dimensional stirring ensures uniform mixing, and real-time monitoring ensures precise adjustment. All components work together to achieve efficient and accurate pH adjustment of the wastewater, meeting subsequent treatment requirements.

[0033] For example, such as Figure 3 As shown, the first stirring rack 6-1 is installed at an inclined angle, and the second stirring rack 6-2 is located on one side of the first stirring rack 6-1.

[0034] In some examples, the design of the first stirring frame 6-1 being installed at an inclined angle and the second stirring frame 6-2 being located on one side optimizes the mixing flow field inside the vessel body 1 and improves the mixing efficiency of wastewater and regulator. When the inclined first stirring frame 6-1 rotates, it can generate an oblique thrust on the wastewater in the lower part of the vessel body 1, pushing the wastewater upward along the wall of the vessel body 1, while the second stirring frame 6-2, located on one side, rotates laterally, pushing the upper wastewater to the other side. The two form a synergistic mixing effect of oblique and lateral forces.

[0035] For example, such as Figure 3 As shown, the pH monitoring head 6-3 is located directly above the second stirring rack 6-2.

[0036] In some examples, the arrangement of the pH monitoring head 6-3 directly above the second stirring rack 6-2 improves the accuracy and real-time performance of pH monitoring data. When the second stirring rack 6-2 rotates laterally, it creates a stable circulation of the surrounding wastewater, ensuring thorough mixing of the regulator and wastewater near the monitoring head. This prevents localized high concentrations of the reagent from distorting the monitoring data. Simultaneously, the circulation continuously delivers wastewater from different areas to the monitoring head, ensuring that the monitoring data reflects the overall pH state of the wastewater within the vessel 1, rather than the instantaneous value of a localized area.

[0037] For example, such as Figure 3 As shown, a sealing layer 7 is provided around the bottom of the top cover 3, and the outer side of the sealing layer 7 is inclined at the point where it fits against the vessel body 1.

[0038] In some examples, the sealing layer 7 and the inclined structural surface on the outer side of the bottom of the top cover 3 further enhance the sealing performance between the top cover 3 and the vessel body 1. The sealing layer 7 is made of acid and alkali resistant and highly elastic material (such as rubber or silicone), which can fit tightly against the top of the vessel body 1 when the top cover 3 is closed, filling tiny gaps; while the design of the inclined structural surface increases the contact area between the sealing layer 7 and the vessel body 1, and when the bolts are tightened to the protrusion 4-4, the inclined surface can generate radial pressure, forcing the sealing layer 7 to further compress and deform, thus improving the sealing effect.

[0039] In actual use: Sodium salt production wastewater is injected into the reactor body 1 through the feed inlet 2. The worm gear 4-3 of the connecting component 4 is electrically driven, which drives the top cover 3 to rotate and close around the outer seat 4-1 via the worm wheel 4-2. The bottom sealing layer 7 of the top cover 3 fits into the reactor body 1, and the boss 4-5 is embedded in the groove 4-7 to form an auxiliary seal. The top cover 3 and the boss 4-4 of the reactor body 1 are then fixed with bolts to ensure the reactor body 1 is sealed. The pH adjuster is added through the addition pipe 4-6 of the boss 4-5. The stirring and monitoring component 6 is activated. The first stirring frame 6-1 (installed at an angle) and the second stirring frame 6-2 rotate together to form a three-dimensional stirring flow field, so that the wastewater and the adjuster are fully mixed. The pH value monitoring head 6-3 (located directly above the second stirring frame 6-2) monitors the pH value of the wastewater in real time, which facilitates the adjustment of the dosage. At the same time, the deodorization component 5 is activated. The exhaust fan 5-2 collects the odor generated by the reaction through the gas collection hood 5-1 and discharges it after being filtered by the purification filter element 5-4 on the outer frame 5-3. When cleaning the vessel body 1, remove the bolts of the protruding layer 4-4, reverse the worm gear 4-3 to open the top cover 3, and then clean the residual salt scale and sediment inside the vessel. The entire process does not require disassembling a large number of parts, making it easy to operate.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A pH adjustment vessel for treating wastewater from monosodium salt production, characterized in that, include: The vessel body (1), the feed inlet (2), and the top cover (3) are provided on the outer wall of the vessel body (1) and the top cover (3) are provided on the top of the vessel body (1). A connecting component (4) is disposed between the vessel body (1) and the top cover (3); A stirring monitoring component (6) is disposed in the vessel body (1); Odor removal component (5), the odor removal component (5) is disposed on the top cover (3); The connecting assembly (4) includes an outer seat (4-1), which is fixed to the outer wall of the vessel body (1). The top cover (3) is rotatably connected to the outer seat (4-1) via a rotating shaft. A worm gear (4-2) is provided at one end of the rotating shaft of the top cover (3). A worm (4-3) driven by electricity is provided on the outside of the vessel body (1). The worm (4-3) meshes with the worm gear (4-2).

2. The pH adjustment vessel for monosodium salt production wastewater according to claim 1, characterized in that, Both ends of the outer surface of the top cover (3) and the vessel body (1) are provided with protrusions (4-4), and the protrusions (4-4) are fixedly connected by bolts. The top of the vessel body (1) is provided with a boss (4-5), and an adding tube (4-6) is installed on the boss (4-5). The top side of the top cover (3) is provided with a groove (4-7), and the groove (4-7) corresponds to the position of the boss (4-5).

3. The pH adjustment vessel for monosodium salt production wastewater according to claim 1, characterized in that, The deodorizing component (5) includes a gas collection hood (5-1), which is installed inside the top of the top cover (3). A suction fan (5-2) is provided on the top of the top cover (3), and the suction end of the suction fan (5-2) is connected to the gas collection hood (5-1).

4. The pH adjusting vessel for monosodium salt production wastewater according to claim 3, characterized in that, The top cover (3) is equipped with an outer frame (5-3), and a purification filter element (5-4) is installed on the outer frame (5-3). The purification filter element (5-4) is inserted and connected to the exhaust end of the suction fan (5-2).

5. The pH adjusting vessel for monosodium salt production wastewater according to claim 1, characterized in that, The stirring monitoring component (6) includes a first stirring rack (6-1), which is installed at the bottom of the vessel body (1). A second stirring rack (6-2) driven by electricity is installed on one side of the inner wall of the vessel body (1). A pH monitoring head (6-3) is installed inside the outer wall of the vessel body (1).

6. The pH adjusting vessel for monosodium salt production wastewater according to claim 5, characterized in that, The first stirring rack (6-1) is installed at an inclined angle, and the second stirring rack (6-2) is located on one side of the first stirring rack (6-1).

7. The pH adjustment vessel for monosodium salt production wastewater according to claim 5, characterized in that, The pH monitoring head (6-3) is located directly above the second stirring rack (6-2).

8. The pH adjustment vessel for monosodium salt production wastewater according to claim 1, characterized in that, A sealing layer (7) is provided around the bottom of the top cover (3), and the outer side of the sealing layer (7) is inclined at the point where it fits against the vessel body (1).

Images