Yellow phosphorus sewage concentration treatment device

Abstract

The yellow phosphorus sewage concentration treatment device comprises a water distribution tank, and a reaction tank body is arranged on one side of the water distribution tank; a mounting frame is fixedly arranged at the upper end of the reaction tank, a lime liquid storage box and a PAM storage box are arranged on the mounting frame, and the lime liquid storage box and the PAM storage box extend into the reaction tank by arranging control valves; a second stirring device is fixedly arranged at the lower end of the mounting frame and extends into the reaction tank; a PH detection sensor is arranged in the reaction tank and is electrically connected with the control valve; a concentration tank is arranged on one side of the reaction tank and is communicated with the reaction tank; one side of the concentration tank is provided with a water taking tank and a filter pressing device, the upper end of the concentration tank is communicated with the water taking tank, and the lower end of the concentration tank is provided with a sediment drain outlet communicated with the filter pressing device. The utility model aims to solve the problems of blockage of a control valve nozzle due to substance enrichment, sodium salt enrichment due to adjustment of caustic soda flakes, corrosion of a circulating system due to a low pH value and taking away of yellow phosphorus due to calcium salt precipitation generated by lime adjustment in the yellow phosphorus sewage treatment process.

Description

Technical Field

[0001] This invention belongs to the field of chemical wastewater treatment technology and relates to a yellow phosphorus wastewater concentration and treatment device. Background Technology

[0002] Yellow phosphorus, as an important chemical raw material, generates a large amount of wastewater during its production. This wastewater contains a variety of complex substances, and its treatment has always been a key challenge for the yellow phosphorus production industry.

[0003] Existing wastewater treatment methods have revealed numerous serious problems in the production and actual use of yellow phosphorus. First, the continuous accumulation of substances in the wastewater directly leads to clogging of wastewater control valves and spray tower nozzles, significantly affecting the spraying effect and consequently negatively impacting the primary phosphorus recovery rate. Second, the long-term reliance on caustic soda (NaOH) to adjust the wastewater's pH value results in the continuous accumulation of sodium salts in the wastewater system, also affecting the spraying effect and inevitably reducing the primary phosphorus recovery rate. Furthermore, the persistently low pH level of 2-3 in the wastewater causes severe corrosion to the wastewater circulation system, shortening equipment lifespan, increasing maintenance costs, and creating safety hazards. In addition, while using lime (emulsion) to directly adjust water quality in the wastewater system can achieve some effect, it generates a large amount of calcium salt precipitation. This calcium salt mixes with phosphorus sludge, leading to a significant increase in phosphorus sludge in the system, which carries away some yellow phosphorus. This undoubtedly negatively impacts the phosphorus recovery rate, reducing the economic benefits and resource utilization of yellow phosphorus production.

[0004] After reviewing relevant materials, the industry currently employs several solutions to address the aforementioned yellow phosphorus wastewater problem. For example, regularly cleaning wastewater control valves and spray tower nozzles manually attempts to alleviate clogging caused by substance accumulation. While this method can restore spraying efficiency to some extent in the short term, it requires frequent shutdowns, increasing labor and time costs. Furthermore, it fails to fundamentally solve the problem of substance accumulation; clogging recurs over time, severely impacting production continuity and stability. Another approach involves using chemical agents to precipitate and remove sodium salts. This involves adding specific precipitants to the wastewater, causing sodium salts to precipitate and separate. However, while this method reduces sodium salt accumulation in the wastewater system, the use of precipitants increases wastewater treatment costs. The precipitation process may introduce new impurities, and subsequent separation and treatment of the precipitate are complex, resulting in limited effectiveness in improving phosphorus recovery rates.

[0005] A comprehensive analysis of the above solutions, considering their advantages and disadvantages in the production process, reveals that current methods cannot fully and effectively address the series of problems encountered in the treatment of yellow phosphorus wastewater, such as substance enrichment, pH adjustment, corrosion, and low phosphorus recovery rates. Therefore, there is an urgent need for a novel, comprehensive yellow phosphorus wastewater concentration and treatment device capable of efficiently solving these problems, improving wastewater treatment efficiency and phosphorus recovery rates in yellow phosphorus production, reducing production costs, and ensuring safe, stable, and sustainable production. Summary of the Invention

[0006] This invention provides a yellow phosphorus wastewater concentration and treatment device to solve problems such as material accumulation clogging control valve nozzles, sodium salt accumulation due to caustic soda adjustment, low pH value corrosion of the circulation system, and calcium salt precipitation caused by lime adjustment that carries away yellow phosphorus during the treatment of yellow phosphorus wastewater.

[0007] Problems include substance accumulation and blockage, pH adjustment, and calcium salt precipitation.

[0008] To solve the above problems, the technical solution adopted by the invention is as follows:

[0009] A yellow phosphorus wastewater concentration and treatment device, characterized in that it includes a water distribution tank, a reaction tank body is provided on one side of the water distribution tank and is connected to the water distribution tank; an installation frame is fixedly provided at the upper end of the reaction tank, on which a lime slurry storage tank and a PAM storage tank are provided, and the lime slurry storage tank and the PAM storage tank extend into the reaction tank through a control valve; a second stirring device is fixedly provided at the lower end of the installation frame and extends into the reaction tank; a pH detection sensor is provided in the reaction tank and is electrically connected to the control valve; a sedimentation tank is provided on one side of the reaction tank and is connected to the reaction tank; a water intake tank and a filter press are provided on one side of the sedimentation tank, the upper end of the sedimentation tank is connected to the water intake tank, and the lower end of the sedimentation tank is provided with a sedimentation discharge port connected to the filter press.

[0010] The principle behind this solution is:

[0011] The yellow phosphorus wastewater first enters the distribution tank for initial collection and preparation. The wastewater in the distribution tank flows into the connected reaction tank. Lime solution and PAM storage tanks on the upper frame of the reaction tank store the necessary chemicals for treatment. Control valves precisely control the amount of lime solution and PAM added to the reaction tank. A second stirring device at the lower end of the frame promotes thorough mixing of the lime solution, PAM, and wastewater, improving reaction efficiency.

[0012] A pH sensor inside the reaction tank monitors the acidity or alkalinity of the wastewater in real time and is electrically connected to a control valve to automatically control the addition of chemical reagents based on the pH value, ensuring precise control of reaction conditions.

[0013] The treated wastewater enters the thickening tank through the connecting pipe for solid-liquid separation. The clear water at the top of the thickening tank flows into the intake tank for further utilization, while the sediment at the bottom of the thickening tank enters the filter press through the sedimentation outlet for treatment, reducing the volume and water content of the waste.

[0014] The beneficial effects of this solution are:

[0015] The water distribution tank can initially buffer and regulate the yellow phosphorus wastewater, providing relatively stable water quality and quantity conditions for subsequent treatment, which is conducive to the smooth progress of the entire treatment process.

[0016] The installation of lime slurry and PAM storage tanks on the upper frame of the reaction tank facilitates the storage and addition of chemical reagents. The dosage is precisely controlled by a control valve, and the electrical connection between the pH sensor and the control valve allows for automatic adjustment of reagent addition based on real-time pH levels within the reaction tank. This ensures precise control of reaction conditions, improves treatment effectiveness and efficiency, and reduces reagent waste. A second stirring device, fixed at the lower end of the mounting frame, extends into the reaction tank, promoting thorough mixing of the reagents and wastewater, resulting in a more uniform and complete reaction. The reaction tank and sedimentation tank are connected via a connecting pipe, ensuring a continuous treatment process. This allows the wastewater to promptly enter a thickening tank for solid-liquid separation. The upper end of the thickening tank is connected to an intake tank, facilitating the collection and reuse of the supernatant, thus improving water resource utilization. The sediment discharge outlet at the lower end of the thickening tank is connected to a filter press, allowing for filtration of the sediment, effectively reducing waste volume and lowering the difficulty and cost of subsequent treatment and disposal.

[0017] Furthermore, the reaction tank body includes a first lime reaction tank, a first PAM reaction tank, a first sedimentation tank, a second lime reaction tank, a second PAM reaction tank, and a second sedimentation tank, which are sequentially connected and arranged through solenoid valves.

[0018] Furthermore, a control valve is provided at the lower end of the lime slurry storage tank, which is connected to the lime slurry storage tank and extends to the upper end of the first lime reaction tank and the second lime reaction tank.

[0019] Furthermore, a control valve is provided at the lower end of the PAM storage tank, which connects to the upper end of the first PAM reaction tank and the second PAM reaction tank.

[0020] Furthermore, a water quality monitoring sensor is installed in the water intake pool, and the water quality monitoring sensor is electrically connected to the alarm.

[0021] Furthermore, a first stirring device is provided at the upper end of the water distribution tank, extending into the water distribution tank.

[0022] Furthermore, the bottom of the thickening tank has a conical structure, and the sedimentation outlet is located at the lowest point.

[0023] Furthermore, the booster pump is equipped with a filter assembly, which has a detachable structure. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of this utility model; Detailed Implementation

[0027] The reference numerals in the accompanying drawings include: 1. Water distribution tank; 2. Reaction tank body; 3. Thickening tank; 4. Water intake tank; 5. Filter press; 6. Mounting frame; 7. Lime solution storage tank; 8. PAM storage tank; 9. Solenoid valve; 10. pH sensor; 11. Lift pump; 12. First lime reaction tank; 13. First PAM reaction tank; 14. Second lime reaction tank; 15. Second PAM reaction tank; 16. Second sedimentation tank; 17. Sedimentation outlet; 18. First stirring device; 19. Second stirring device; 20. Outlet; 21. Filter assembly; 22. Alarm; 23. Water quality sensor; 24. Control valve; 25.

[0028] The basic implementation examples are as follows: Figure 1-3 As shown, a yellow phosphorus wastewater concentration treatment device includes a water distribution tank 1, a reaction tank body 2, a concentration tank 3, a water intake tank 4, and a filter press 5. The yellow phosphorus wastewater first enters the water distribution tank 1. A first stirring device 19 is provided at the upper end of the water distribution tank 1 and extends into the water distribution tank 1. When the first stirring device 19 is working, it can quickly and evenly mix the wastewater, avoid component stratification and excessively high local concentration, ensure uniform wastewater quality in subsequent treatment processes, accelerate wastewater flow, prevent sedimentation or siltation, and keep the water distribution tank 1 unobstructed.

[0029] Wastewater in the distribution tank 1 flows to the reaction tank body 2 via the lift pump 11. The reaction tank body 2 includes a first lime reaction tank 12, a first PAM reaction tank 13, a first sedimentation tank 14, a second lime reaction tank 15, a second PAM reaction tank 16, and a second sedimentation tank 17, which are connected in sequence via solenoid valves 9.

[0030] A mounting frame 6 is fixedly installed at the upper end of the reaction tank. A lime slurry storage tank 7 and a PAM storage tank 8 are installed on the mounting frame 6. A control valve 25 is installed at the lower end of the lime slurry storage tank 7 and extends to the upper end of the first lime reaction tank 12 and the second lime reaction tank 15. The amount of lime slurry added can be controlled by the control valve 25 to avoid waste and make the lime slurry flow out more smoothly by using gravity. A control valve 25 is installed at the lower end of the PAM storage tank 8 and extends to the upper end of the first PAM reaction tank 13 and the second PAM reaction tank 16. The amount of PAM added can be adjusted to improve the efficiency of reagent use.

[0031] A second stirring device 20 is fixedly installed at the lower end of the mounting frame 6, extending into the reaction tank to promote thorough mixing of the reagent and wastewater, thereby improving reaction efficiency and uniformity. A pH detection sensor 10 is installed in the reaction tank, which is electrically connected to the control valve 25. The sensor automatically controls the addition of chemical reagents based on the pH value to ensure accurate reaction conditions.

[0032] The treated wastewater enters the thickening tank 3 through the connecting pipe. The bottom of the thickening tank 3 has a conical structure, and the sedimentation outlet 18 is set at the lowest point. This allows the sediment to naturally gather towards the center of the bottom under the action of gravity, reducing the bottom area and increasing the downward force on the sediment, thus accelerating the sedimentation process and improving sedimentation efficiency.

[0033] The clear water at the top of the thickening tank 3 flows into the water intake tank 4. The water intake tank 4 is equipped with a water quality pH sensor 10. The pH sensor 10 is electrically connected to the alarm 23 to monitor the water quality in real time and ensure that it meets the discharge standards or reuse requirements. An alarm will be triggered in time if the water quality is abnormal.

[0034] The sediment at the bottom of the thickening tank 3 enters the filter press 5 through the sediment discharge port 18 for treatment. The filter press is a plate frame filter press, which filters the sediment to reduce the volume and water content of the waste.

[0035] A detachable filter assembly 22 is installed on the booster pump 11 to perform preliminary filtration of the sewage entering the booster pump 11, intercepting larger impurities and particles, reducing wear and clogging of the booster pump 11, and extending its service life. When the filter assembly 22 needs maintenance or replacement, the detachable structure facilitates operation.

[0036] In operation, the yellow phosphorus wastewater first enters the distribution tank 1, where the first stirring device 19 continuously operates to ensure thorough mixing. Subsequently, the wastewater flows into the reaction tank body 2. In the first lime reaction tank 12, an appropriate amount of lime solution is precisely added through the control valve 25, and the second stirring device 20 promotes the reaction. Next, PAM is added to the first PAM reaction tank for flocculation, and initial sedimentation occurs in the first sedimentation tank 14. Afterward, the wastewater sequentially passes through the second lime reaction tank 15, the second PAM reaction tank, and the second sedimentation tank 17 for further removal of impurities and sediment.

[0037] During the reaction, the pH sensor 10 monitors in real time and automatically adjusts the amount of chemical reagents added. The treated wastewater enters the thickening tank 3, and the sedimentation outlet 18 at the conical bottom and lowest point ensures efficient discharge of sediment. The clear water at the top of the sedimentation tank flows into the intake tank 4. The pH sensor 10 does not detect any abnormalities, and the clear water can be reused. Furthermore, during use, both the bottom of the first sedimentation tank 14 and the second sedimentation tank 17 are equipped with a discharge outlet 21, which is connected to the filter press device 5.

[0038] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A yellow phosphorus wastewater concentration and treatment device, characterized in that, The system includes a water distribution tank, with a reaction tank body connected to one side of the water distribution tank. A mounting frame is fixedly installed at the upper end of the reaction tank, on which a lime slurry storage tank and a PAM storage tank are mounted, extending into the reaction tank via a control valve. A second stirring device is fixedly installed at the lower end of the mounting frame, extending into the reaction tank. A pH sensor is installed inside the reaction tank, electrically connected to the control valve. A concentration tank is located on one side of the reaction tank, connected to the reaction tank. A water intake tank and a filter press are located on one side of the concentration tank, with the upper end of the concentration tank connected to the water intake tank and the lower end of the concentration tank having a sedimentation outlet connected to the filter press.

2. The yellow phosphorus wastewater concentration and treatment device according to claim 1, characterized in that, The reaction tank body includes a first lime reaction tank, a first PAM reaction tank, a first sedimentation tank, a second lime reaction tank, a second PAM reaction tank, and a second sedimentation tank, which are connected in sequence through solenoid valves.

3. The yellow phosphorus wastewater concentration and treatment device according to claim 1, characterized in that, A control valve is installed at the lower end of the lime slurry storage tank, which is connected to the lime slurry storage tank and extends to the upper end of the first lime reaction tank and the second lime reaction tank.

4. The yellow phosphorus wastewater concentration and treatment device according to claim 1, characterized in that, The lower end of the PAM storage tank is equipped with a control valve that connects to the PAM storage tank and extends to the upper end of the first PAM reaction tank and the second PAM reaction tank.

5. The yellow phosphorus wastewater concentration and treatment device according to claim 1, characterized in that, The water intake pool is equipped with a water quality monitoring sensor, which is electrically connected to the alarm.

6. The yellow phosphorus wastewater concentration and treatment device according to claim 1, characterized in that, The upper end of the water distribution tank is equipped with a first stirring device that extends into the water distribution tank.

7. The yellow phosphorus wastewater concentration and treatment device according to claim 1, characterized in that, The bottom of the thickening tank has a conical structure, and the sedimentation outlet is located at the lowest point.

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