A neutralization pretreatment device for acid-base waste liquid

Abstract

The utility model relates to the technical field of pesticide chemical industry, more particularly to a kind of acid-alkali waste liquid neutralization pretreatment device, acid-alkali waste liquid neutralization pretreatment device includes concrete foundation, lye temporary storage tank and neutralization processing tower. Among them, the coaxial center tube is arranged in neutralization processing tower, and the internal neutralization area and the outer ring precipitation area are formed. Acidic wastewater and lye are pumped into neutralization area by independent pipeline, and the automatic control of dosing ratio is realized by PH monitoring sensor and regulating valve, and the neutralization reaction is completed. Mixed solution then enters precipitation area to realize solid-liquid separation. The integrated design effectively reduces the corrosivity of wastewater, reduces the erosion of the conveying pipeline, and improves the processing efficiency and space utilization. The overall device runs stably, with high automation, providing reliable pretreatment for subsequent sewage treatment.

Description

Technical Field

[0001] This utility model relates to the field of pesticide chemical technology, and more specifically, to an acid-base waste liquid neutralization pretreatment device. Background Technology

[0002] The industrial production of pesticides generates a large amount of chemical wastewater. Taking pyrethroid pesticides as an example, their production process involves multiple organic synthesis reactions and separation and purification steps, which produce wastewater with complex compositions. The acidity or alkalinity of this wastewater is not fixed but dynamically changes depending on the specific synthesis route, raw materials, and reaction conditions. For example, acidic wastewater is generated in substitution reactions such as chlorination and sulfonation, while alkaline wastewater is often generated in reactions involving sodium cyanide or in condensation and hydrolysis processes. This acidic and alkaline wastewater needs to be transported to a wastewater treatment plant for centralized treatment through a pipeline system. It can only be discharged when the toxic and harmful content in the wastewater meets the discharge standards.

[0003] Because acidic and alkaline wastewater can easily corrode pipelines during transportation, thus reducing the service life of the pipeline system, it is necessary to pre-treat the wastewater before transportation to reduce its corrosive effect on the pipeline system and improve the service life and treatment efficiency of the wastewater treatment plant. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an acid-base wastewater neutralization pretreatment device, which aims to neutralize the pH value of wastewater through acid-base neutralization, reduce the corrosive effect of wastewater on the pipeline system, and improve the service life and treatment efficiency of the wastewater treatment plant.

[0005] An acid-base waste liquid neutralization pretreatment device according to an embodiment of the present invention includes: A concrete foundation, on which an underground trench is provided; An alkaline solution storage tank is provided with a first water inlet pipe, and a first regulating valve and a first water pump are provided on the first water inlet pipe. A neutralization treatment tower is provided, comprising a tower cylinder, a central cylinder coaxially arranged within the tower cylinder, forming a neutralization zone within the central cylinder; a sedimentation zone is formed by the outer peripheral wall of the central cylinder and the inner peripheral wall of the tower cylinder; a second water inlet pipe is provided at the upper end of the tower cylinder, and a second regulating valve and a second water pump are provided on the second water inlet pipe; the first water inlet pipe and the second water inlet pipe are respectively inserted into the central cylinder and connected to the neutralization zone; a pH value monitoring sensor is provided inside the tower cylinder.

[0006] According to some embodiments of the present invention, an overflow groove is provided on the inner peripheral wall of the tower, a drain pipe is provided on the tower, and a drain valve and a third water pump are provided on the drain pipe.

[0007] According to some embodiments of the present invention, a serrated baffle is provided on the side of the overflow trough near the center of the tower.

[0008] According to some embodiments of this utility model, the lower end of the central cylinder is provided with a flared opening.

[0009] According to some embodiments of this utility model, a float valve is provided in the overflow trough.

[0010] According to some embodiments of the present invention, a filter sleeve is provided at the inlet end of the drain pipe.

[0011] According to some embodiments of this utility model, a hopper is provided at the lower end of the tower. According to some embodiments of the present invention, the neutralization treatment tower includes a sludge discharge assembly, which includes a sludge discharge pipe and a slurry pump. One end of the sludge discharge pipe is connected to the hopper, and the other end of the sludge discharge pipe is connected to the input end of the slurry pump. A first shut-off valve is provided on the sludge discharge pipe.

[0012] According to some embodiments of this utility model, the sludge discharge pipe is provided with a Y-shaped pipe section, and a second shut-off valve is provided on the Y-shaped pipe section.

[0013] According to some embodiments of the present invention, a tower frame is provided on the outer periphery of the tower cylinder, and a concrete pile is provided at the bottom of the tower frame; a cover plate is provided at the upper end of the tower cylinder, and an inspection port is provided on the cover plate.

[0014] An acid-base waste liquid neutralization pretreatment device according to an embodiment of the present invention has at least the following beneficial effects: According to the present invention, acidic wastewater and alkaline wastewater undergo a neutralization reaction in the central cylinder, which can effectively reduce the corrosiveness of the wastewater and thus reduce its erosion of subsequent conveying pipelines.

[0015] According to the present invention, the neutralization treatment tower integrates the neutralization zone and the sedimentation zone inside the tower, realizing the integration of reaction and sedimentation separation, and improving processing efficiency and space utilization.

[0016] According to the solution of this utility model, the design of the concrete foundation and the underground trench ensures the overall stability of the device and avoids environmental pollution caused by wastewater leakage.

[0017] According to the present invention, the combined use of a pH monitoring sensor and a regulating valve enables automated control of the neutralization process, ensuring the stability and reliability of the treatment effect and creating favorable conditions for the smooth and efficient operation of the subsequent sewage treatment plant. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the neutralization treatment tower of this utility model; Figure 3 This is a cross-sectional structural schematic diagram of the neutralization treatment tower of this utility model; Figure 4 This is a partial enlarged schematic diagram of the neutralization treatment tower of this utility model.

[0019] In the picture: 100 - Concrete foundation; 110 - Underground trench; 200 - Alkali solution temporary storage tank, 210 - First water inlet pipe, 220 - First regulating valve, 230 - First water pump; 300-Neutralization treatment tower, 310-Tower cylinder, 311-Central cylinder, 312-Neutralization zone, 313-Sedimentation zone, 314-Overflow trough, 315-Serrated baffle, 316-Bell mouth, 317-Hopper, 320-Second water inlet pipe, 321-Second regulating valve, 322-Second water pump, 330-pH monitoring sensor, 340-Drain pipe, 341-Drain valve, 342-Third water pump, 343-Filter sleeve, 350-Float valve, 360-Sludge discharge assembly, 361-Sludge discharge pipe, 362-Sludge pump, 363-First shut-off valve, 364-Y-type pipe section, 365-Second shut-off valve, 370-Tower frame, 371-Concrete pile, 380-Cover plate, 381-Inspection port. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the 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.

[0022] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Reference Figures 1 to 4As shown, this utility model discloses an acid-base waste liquid neutralization pretreatment device, which includes a concrete foundation 100, an alkali storage tank 200, and a neutralization treatment tower 300. The concrete foundation 100 is supported by a buried trench 110. The alkali storage tank 200 is equipped with a first inlet pipe 210, which is connected to a first regulating valve 220 and a first water pump 230. The neutralization treatment tower 300 is placed in the buried trench 110 and includes a tower cylinder 310. A central cylinder 311 is coaxially arranged inside the tower 310, forming a neutralization zone 312. A sedimentation zone 313 is formed by the outer peripheral wall of the central cylinder 311 and the inner peripheral wall of the tower 310. A second inlet pipe 320 is provided at the upper end of the tower 310, and a second regulating valve 321 and a second water pump 322 are installed on the second inlet pipe 320. The first inlet pipe 210 and the second inlet pipe 320 are respectively inserted into the central cylinder 311 and connected to the neutralization zone 312. A pH monitoring sensor 330 is installed inside the tower 310. Specifically, in this embodiment, acidic wastewater is lifted through the second inlet pipe 320 by the second water pump 322, and the flow rate is controlled by the second regulating valve 321 before entering the central cylinder 311 of the neutralization treatment tower 300. Simultaneously, the alkali solution in the alkali storage tank 200 is transported through the first inlet pipe 210 by the first water pump 230, and the flow rate is regulated by the first regulating valve 220, also being injected into the central cylinder 311. The two waste liquids are thoroughly mixed and reacted within the neutralization zone 312 formed by the central cylinder 311. A pH monitoring sensor 330 installed inside the tower 310 monitors the acidity or alkalinity of the mixed liquid in real time, and the feedback signal precisely adjusts the opening of the first regulating valve 220 and the second regulating valve 321, thereby controlling the addition ratio of acidic and alkaline wastewater to ensure that the neutralization reaction reaches the preset pH range. After neutralization, the mixture enters the annular sedimentation zone 313 formed by the outer peripheral wall of the central cylinder 311 and the inner peripheral wall of the tower 310 from the neutralization zone 312. In this zone, the precipitate generated by the reaction settles naturally. Through this structural design, the neutralization reaction of acidic and alkaline wastewater within the central cylinder 311 effectively reduces the corrosiveness of the wastewater, thereby reducing its erosion of subsequent transport pipelines. The neutralization treatment tower 300 integrates the neutralization zone 312 and the sedimentation zone 313 within the tower 310, achieving integrated reaction and sedimentation separation, improving treatment efficiency and space utilization. The design of the concrete foundation 100 and the underground trench 110 ensures the overall stability of the device and avoids environmental pollution caused by wastewater leakage. The combined use of the pH monitoring sensor 330 and the regulating valve enables automated control of the neutralization process, ensuring the stability and reliability of the treatment effect and creating favorable conditions for the smooth and efficient operation of the subsequent wastewater treatment plant.

[0025] In some embodiments of this invention, an overflow trough 314 is provided on the inner peripheral wall of the tower 310, and a drain pipe 340 is provided on the tower 310. A drain valve 341 and a third water pump 342 are installed on the drain pipe 340. After sedimentation and separation, the liquid level of the upper clear liquid in the sedimentation zone 313 gradually rises and eventually overflows through the overflow trough 314 on the inner peripheral wall of the tower 310. The overflowing treated water enters the drain pipe 340 connected to the overflow trough 314. The drain valve 341 installed on the drain pipe 340 is used to control the flow of the pipeline, while the third water pump 342 provides power to transport the qualified treated water to the subsequent pipeline system or storage unit. Data from the pH monitoring sensor 330 can also serve as an auxiliary basis for judging the quality of the discharged water. The structural design of the overflow trough 314 achieves effective physical separation and collection of the upper clear liquid and the bottom sediment. The combination of drain pipe 340, drain valve 341, and third water pump 342 enables the treated wastewater to be discharged or transferred in a controlled manner, ensuring the continuity of the treatment process. The entire system achieves integrated and automated operation from neutralization and sedimentation to drainage, further improving the reliability and efficiency of the pretreatment stage.

[0026] Furthermore, a serrated baffle 315 is provided on the side of the overflow tank 314 near the center of the tower 310. The design of the serrated baffle 315 can block some floating impurities. Further, a filter sleeve 343 is provided at the inlet end of the drain pipe 340. Specifically, in this embodiment, after solid-liquid separation is completed in the sedimentation zone 313, the upper clear liquid level continues to rise. When the liquid level reaches a set height, the clear liquid will first overflow over the serrated baffle 315 located on the side of the overflow tank 314 near the center of the tower 310. This serrated baffle 315 can evenly collect the surface clear liquid and helps to block slight scum that may be suspended on the liquid surface. Subsequently, the clear liquid enters the interior of the overflow tank 314 and is guided through the tank to the inlet end of the drain pipe 340. The inlet end of the drain pipe 340 is equipped with a filter sleeve 343, which can perform a final filtration of the water to be discharged, intercepting any fine particles that may escape. Finally, under the power supply of the third water pump 342 and the opening and closing control of the drain valve 341, the treated wastewater is discharged from the device through the drain pipe 340. The design of the serrated baffle 315 improves the uniformity and stability of the overflow process, and its structure effectively reduces the surface scum carried out with the water flow, enhancing the solid-liquid separation effect. The filter sleeve 343 installed at the inlet of the drain pipe 340 constitutes another physical barrier, further ensuring the clarity of the discharged water and reducing the potential risk of blockage and wear to subsequent pipes or equipment. These two features together optimize the quality of the discharged water and improve the reliability of the final water produced by the entire pretreatment unit.

[0027] In some embodiments of this invention, a funnel-shaped opening 316 is provided at the lower end of the central cylinder 311. Specifically, in this embodiment, the funnel-shaped opening 316 at the lower end of the central cylinder 311 forms a transition channel between the neutralization zone 312 and the sedimentation zone 313. When the liquid-solid mixture after the neutralization reaction flows through this funnel-shaped opening 316, its flow cross-section gradually expands, resulting in a significant decrease in flow velocity. This gradual change in flow velocity helps to reduce the disturbance of the fluid to the settled solid phase at the bottom of the sedimentation zone 313 and creates more stable hydraulic conditions for subsequent solid-liquid separation. The mixture then enters the annular sedimentation zone 313, where solid particles continue to settle under gravity, while the supernatant is eventually discharged through the overflow trough 314 and the drainage system. The design of the funnel-shaped opening 316 effectively reduces the kinetic energy of the outflowing liquid by optimizing the flow state of the fluid from the central cylinder 311 to the sedimentation zone 313, thereby reducing the impact and resuspension of the sludge layer in the sedimentation zone 313. This structure improves the settling efficiency of large particles and helps to form a clearer mud-water interface in the settling zone 313, thereby enhancing the overall solid-liquid separation effect. The funnel-shaped opening 316, as an extension of the outlet of the neutralization zone 312, further ensures a smooth structural connection between the reaction zone and the separation zone.

[0028] In some embodiments of this utility model, a float valve 350 is provided in the overflow tank 314. Specifically, in this embodiment, the lowest position of the float valve 350 is higher than the position of the drain pipe 340 in the overflow tank 314 in the vertical direction. When the upper clear liquid in the sedimentation zone 313 overflows the serrated baffle 315 and flows into the overflow tank 314, the liquid level in the tank begins to rise. As the liquid level rises, the float valve 350 in the overflow tank 314 floats up due to its buoyancy, thereby opening the valve passage. Since the lowest position of the float valve 350 is higher than the inlet position of the drain pipe 340 in the overflow tank 314 in the vertical direction, it is ensured that the drainage operation will only occur when the liquid level accumulates to a sufficient height to completely submerge and float the float valve 350. At this time, the liquid in the tank can flow to the inlet of the drain pipe 340 through the opened float valve 350, and after being filtered by the filter sleeve 343, it is discharged by the third water pump 342. When the liquid level drops, the float valve 350 descends and closes, thus cutting off the drainage path. The float valve 350 is installed within the overflow tank 314 and maintains a specific height difference with the inlet of the drain pipe 340, achieving automatic drainage control based on the liquid level. This design effectively prevents air from being drawn into the drain pipe 340 or any disturbance of trace sediments at the bottom of the tank due to excessively low liquid levels, thereby ensuring the stability of the drainage operation and the purity of the discharged water. Simultaneously, this structure also acts as a liquid level safety switch, preventing ineffective operation of the system under conditions where the minimum operating liquid level is not met, thus improving the automation level and reliability of the device operation.

[0029] In some embodiments of this utility model, a hopper 317 is provided at the lower end of the tower 310. Further, the neutralization treatment tower 300 includes a sludge discharge assembly 360, which includes a sludge discharge pipe 361 and a slurry pump 362. One end of the sludge discharge pipe 361 is connected to the hopper 317, and the other end is connected to the input end of the slurry pump 362. A first shut-off valve 363 is provided on the sludge discharge pipe 361. After solid-liquid separation is completed in the sedimentation zone 313, the solid sludge formed by sedimentation collects downwards under gravity and eventually falls into the hopper 317 located at the lower end of the tower 310. The hopper 317 collects and temporarily stores the sludge. When sludge needs to be discharged, the sludge discharge assembly 360 is activated. The operator first opens the first shut-off valve 363 on the sludge discharge pipe 361, and then starts the slurry pump 362. The sludge pump 362 draws out the sludge accumulated in the hopper 317 through the sludge discharge pipe 361 connected to its input end, and transports it to the subsequent sludge treatment unit. The hopper 317 at the lower end of the tower 310 provides a dedicated collection space for settled sludge, which is beneficial for sludge concentration and subsequent discharge. The sludge discharge assembly 360, through the combination of the sludge discharge pipe 361 and the sludge pump 362, realizes the active and controllable removal of accumulated sludge, avoiding blockage or reduced treatment efficiency that may be caused by long-term sludge accumulation at the bottom of the device. The first shut-off valve 363 installed on the sludge discharge pipe 361 facilitates the disconnection and isolation of the sludge discharge pipe 361, providing convenience for equipment maintenance and process control. The introduction of this sludge discharge system ensures the continuous and stable operation of the neutralization treatment tower 300.

[0030] In some embodiments of this utility model, the sludge discharge pipe 361 is provided with a Y-shaped pipe section 364, and a second shut-off valve 365 is provided on the Y-shaped pipe section 364. The Y-shaped pipe section 364 and the second shut-off valve 365 on the sludge discharge pipe 361 provide an alternative path or cleaning bypass for the sludge discharge process, thereby improving the maintainability of the system.

[0031] In some embodiments of this utility model, a tower frame 370 is provided on the outer periphery of the tower 310, and a concrete pile 371 is provided at the bottom of the tower frame 370; a cover plate 380 is provided at the upper end of the tower 310, and an inspection port 381 is provided on the cover plate 380. The tower is supported by the tower frame 370 provided on its exterior, and the bottom of the tower frame 370 is firmly connected to the foundation through the concrete pile 371, ensuring the structural stability of the entire neutralization treatment tower 300 during operation. The cover plate 380 installed at the upper end of the tower 310 realizes the sealing of the tower body, which can prevent external debris from entering and suppress the escape of internal gas. The inspection port 381 provided on the cover plate 380 provides a necessary passage for periodically inspecting internal components, maintaining the pH value monitoring sensor 330, or handling abnormal conditions.

[0032] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An acid-base waste liquid neutralization pretreatment device, characterized in that, include: A concrete foundation (100) is provided with an underground trench (110). Alkali storage tank (200), the alkali storage tank (200) is provided with a first water inlet pipe (210), the first water inlet pipe (210) is provided with a first regulating valve (220) and a first water pump (230); A neutralization treatment tower (300) is provided with a tower cylinder (310), and a central cylinder (311) is coaxially arranged inside the tower cylinder (310). A neutralization zone (312) is formed inside the central cylinder (311). A sedimentation zone (313) is formed between the outer peripheral wall of the central cylinder (311) and the inner peripheral wall of the tower cylinder (310). A second water inlet pipe (320) is provided at the upper end of the tower cylinder (310). A second regulating valve (321) and a second water pump (322) are provided on the second water inlet pipe (320). The first water inlet pipe (210) and the second water inlet pipe (320) are respectively inserted into the central cylinder (311) and connected to the neutralization zone (312). A pH value monitoring sensor (330) is provided inside the tower cylinder (310).

2. The acid-base waste liquid neutralization and pretreatment device according to claim 1, characterized in that, An overflow groove (314) is provided on the inner peripheral wall of the tower (310), and a drain pipe (340) is provided on the tower (310). A drain valve (341) and a third water pump (342) are provided on the drain pipe (340).

3. The acid-base waste liquid neutralization pretreatment device according to claim 2, characterized in that, The overflow trough (314) is provided with a serrated baffle (315) on the side near the center of the tower (310).

4. The acid-base waste liquid neutralization and pretreatment device according to claim 3, characterized in that, The lower end of the central cylinder (311) is provided with a flared mouth (316).

5. The acid-base waste liquid neutralization pretreatment device according to claim 2, characterized in that, A float valve (350) is installed inside the overflow trough (314).

6. The acid-base waste liquid neutralization pretreatment device according to claim 2, characterized in that, The inlet end of the drain pipe (340) is provided with a filter sleeve (343).

7. The acid-base waste liquid neutralization and pretreatment device according to claim 1, characterized in that, A hopper (317) is provided at the lower end of the tower (310).

8. The acid-base waste liquid neutralization pretreatment device according to claim 7, characterized in that, The neutralization treatment tower (300) includes a sludge discharge assembly (360), which includes a sludge discharge pipe (361) and a slurry pump (362). One end of the sludge discharge pipe (361) is connected to the hopper (317), and the other end of the sludge discharge pipe (361) is connected to the input end of the slurry pump (362). A first shut-off valve (363) is provided on the sludge discharge pipe (361).

9. The acid-base waste liquid neutralization pretreatment device according to claim 8, characterized in that, The sludge discharge pipe (361) is provided with a Y-shaped pipe section (364), and a second shut-off valve (365) is provided on the Y-shaped pipe section (364).

10. The acid-base waste liquid neutralization pretreatment device according to claim 1, characterized in that, A tower frame (370) is provided on the outer periphery of the tower (310), and a concrete pile (371) is provided at the bottom of the tower frame (370); a cover plate (380) is provided at the upper end of the tower (310), and an inspection port (381) is provided on the cover plate (380).

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