Reaction device for realizing continuous phosphorus recovery and dynamic pH regulation and control

Abstract

The utility model relates to a reaction device capable of realizing continuous phosphorus recovery and dynamic pH regulation and control, which belongs to the technical field of wastewater treatment and resource recovery and comprises a circulating precipitation reaction device, and the circulating precipitation reaction device sequentially comprises an outer circulating reaction tube, a primary precipitation tube, a secondary precipitation tube, a tertiary precipitation tube and a precipitation collection port which are integrally formed from top to bottom, an inner circulation reaction tube concentric with the outer circulation reaction tube is arranged in the outer circulation reaction tube, and the same reaction control cover plate is arranged at the tops of the outer circulation reaction tube and the outer circulation reaction tube; due to the continuous flow reaction design, whole-process automation of phosphorus-containing wastewater treatment and phosphorus recovery is achieved, traditional intermittent operation is replaced, the treatment efficiency is improved, and the large-scale wastewater treatment requirement is met; meanwhile, frequent starting and stopping of equipment are reduced, reaction conditions are optimized, energy consumption and reagent dosage are reduced, and cost is saved; an intelligent pH monitoring and regulating system is integrated, the reaction pH is controlled in real time, accurate pH regulation is achieved, and meanwhile the purity and quality of phosphorus products such as struvite are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment and resource recovery technology, and relates to a reaction device for realizing continuous phosphorus recovery and dynamic pH control, especially a reaction device for treating phosphorus-containing wastewater, which can realize efficient recovery of phosphorus resources and dynamic control of pH value. Background Technology

[0002] Struvite (magnesium ammonium phosphate (Mg(NH4)PO4·6H2O)) crystallization is a highly efficient and environmentally friendly phosphorus recovery technology, widely used in wastewater treatment and phosphorus resource recovery. Struvite crystallization precipitates inorganic phosphorus as magnesium ammonium phosphate by controlling the pH and chemical composition of the solution. In practice, magnesium chloride (MgCl2·6H2O) and ammonium chloride (NH4Cl) are typically used as reactants, and the pH of the solution is controlled at around 10 to promote struvite crystallization.

[0003] Currently, the phosphorus recovery field mainly relies on batch reactors for wastewater treatment and phosphorus resource recovery. These reactors require batch operation, with each batch undergoing feeding, reaction, and discharging stages, resulting in low overall treatment efficiency and difficulty in meeting the continuous requirements of large-scale wastewater treatment. In terms of energy consumption, batch reactors consume more energy due to frequent start-ups and shutdowns, increasing the cost of wastewater treatment. Furthermore, batch operation typically requires significant manual intervention to monitor and adjust reaction conditions, which not only increases labor costs but also may lead to unstable treatment results due to human error.

[0004] In phosphorus recovery, pH is a critical process parameter that directly affects the phosphorus recovery rate and the quality of the final product. However, existing batch reactors often lack efficient pH control mechanisms, making it impossible to achieve real-time, precise pH control. This results in significant pH fluctuations during phosphorus recovery, which in turn affects the crystallization quality of phosphorus products such as struvite, leading to unstable purity of the recovered phosphorus products and making it difficult to meet the high standards required for applications such as agriculture. Utility Model Content

[0005] In view of this, in order to solve the problems of low treatment efficiency caused by the need for batch operation of existing batch reactors; high energy consumption and increased wastewater treatment costs due to frequent start-up and shutdown of batch reactors; excessive manual intervention; and inability to achieve real-time and precise control of pH value, this utility model provides a reaction device that realizes continuous phosphorus recovery and dynamic pH control.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A reaction device for continuous phosphorus recovery and dynamic pH control includes a circulating precipitation reaction device. The circulating precipitation reaction device includes, from top to bottom, an integrally formed external circulation reaction tube, a primary precipitation tube, a secondary precipitation tube, a tertiary precipitation tube, and a precipitation collection port. An internal circulation reaction tube with the same center is set inside the external circulation reaction tube. The external circulation reaction tube and the top of the external circulation reaction tube are provided with the same reaction control cover.

[0008] Furthermore, the reaction control cover is circular, with a gas guide tube inserted at its center. Along the circumference of the gas guide tube, the reaction control cover is equipped with an automatic alkali source inlet, an internal pressure vent, a nitrogen source inlet, a magnesium source inlet, and a phosphorus source inlet. Along the circumference of the gas guide tube, the edge of the reaction control cover is equipped with a pH detection port, a sampling port, and a pressure relief vent. The pH detection port is connected to a Hash pH meter, the automatic alkali source inlet is connected to a pH peristaltic pump, and the nitrogen, magnesium, and phosphorus source inlets are all connected to the same peristaltic pump. The gas guide tube is connected to a gas stirring pump, and the sampling port is used to extract the solution to be discharged after the reaction for testing.

[0009] Furthermore, the internal pressure vent is connected to the internal circulation reaction pipe, and the pressure relief vent is connected to the external circulation reaction pipe.

[0010] Furthermore, a drain port is provided on the outside of the external circulation reaction tube to discharge the solution after the reaction.

[0011] Furthermore, the reaction control cover is equipped with a gas pipe height adjustment knob for adjusting the height of the gas pipe. A limit sleeve is fitted onto the gas pipe, and a bolt fastener is rotatably connected to the limit sleeve. One end of the bolt fastener abuts against the gas pipe, and the other end is connected to the gas pipe height adjustment knob.

[0012] Furthermore, the sedimentation collection port is equipped with a sedimentation collection control switch and a sedimentation collection control knob that works in conjunction with the sedimentation collection control switch.

[0013] Furthermore, the circulating precipitation reaction device is fixed by a base set at the bottom, which consists of a base plate, a base side plate, and a base support.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The reaction device disclosed in this utility model for realizing continuous phosphorus recovery and dynamic pH control adopts an advanced continuous flow reaction design, which eliminates the drawbacks of traditional batch reactors and realizes full automation of phosphorus wastewater treatment and phosphorus recovery, replacing traditional batch operation, improving treatment efficiency, and meeting the needs of large-scale wastewater treatment; at the same time, it reduces frequent start-up and shutdown of equipment, optimizes reaction conditions, reduces energy consumption and reagent usage, and saves costs.

[0016] 2. The reaction device disclosed in this utility model for continuous phosphorus recovery and dynamic pH control is equipped with a HashpH meter featuring a high-precision pH sensor and an intelligent control system. This system can monitor pH changes during the reaction process in real time. It also automatically adjusts the amount of alkali added via a pH peristaltic pump to maintain a stable reaction environment. The integrated intelligent pH monitoring and control system controls the reaction pH in real time, providing precise pH regulation and effectively improving the phosphorus recovery rate. Simultaneously, it ensures the purity and quality of phosphorus products such as struvite, stabilizing product quality and making it more compliant with the high standards required for applications in agriculture and other fields.

[0017] 3. The reaction device disclosed in this utility model for realizing continuous phosphorus recovery and dynamic pH control adopts an automated control system, which reduces manpower requirements and operational risks.

[0018] 4. The reaction device disclosed in this utility model for continuous phosphorus recovery and dynamic pH control reduces the amount of chemical reagents used, lowers treatment costs, and reduces secondary pollution, demonstrating significant environmental benefits. This helps to promote the development of wastewater treatment technology towards a greener and more sustainable direction, contributing to environmental protection and resource recycling.

[0019] 5. The reaction device disclosed in this utility model, which realizes continuous phosphorus recovery and dynamic pH control, helps to alleviate the current global phosphorus resource shortage. By converting phosphorus-containing wastewater into high-value-added phosphorus products, not only is resource recycling realized, but also technological support for the sustainable development of related industries is provided, promoting the coordinated development of efficient resource utilization and environmental protection.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of a reaction device for achieving continuous phosphorus recovery and dynamic pH control according to the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of a reaction device for achieving continuous phosphorus recovery and dynamic pH control according to the present invention. Figure 2 ;

[0024] Figure 3 This is a cross-sectional view of a reaction device for achieving continuous phosphorus recovery and dynamic pH control according to the present invention. Figure 1 ;

[0025] Figure 4 This is a cross-sectional view of a reaction device for achieving continuous phosphorus recovery and dynamic pH control according to the present invention. Figure 2 ;

[0026] Figure 5 This is a schematic diagram of the reaction control cover plate in a reaction device for continuous phosphorus recovery and dynamic pH control according to the present invention.

[0027] Figure labels: 1. pH detection port; 2. Automatic alkali source feed port; 3. Internal pressure vent; 4. Nitrogen source feed port; 5. Magnesium source feed port; 6. Phosphorus source feed port; 7. Gas guide pipe; 8. Gas guide pipe height adjustment knob; 9. Pressure relief vent; 10. Sampling port; 11. Internal circulation reaction pipe; 12. External circulation reaction pipe; 13. Drainage port; 14. Primary sedimentation pipe; 15. Secondary sedimentation pipe; 16. Tertiary sedimentation pipe; 17. Sedimentation collection control knob; 18. Sedimentation collection control switch; 19. Sedimentation collection port; 20. Base plate; 21. Base side plate; 22. Base support column; 23. Reaction control cover plate. Detailed Implementation

[0028] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] like Figure 1-5 The apparatus shown is a reaction device for continuous phosphorus recovery and dynamic pH control, including a circulating precipitation reaction device. The circulating precipitation reaction device includes, from top to bottom, an integrally formed external circulation reaction tube 12, a primary precipitation tube 14, a secondary precipitation tube 15, a tertiary precipitation tube, and a precipitation collection port 19. A drain port 13 is provided on the outside of the external circulation reaction tube 12 for discharging the solution after the reaction. A precipitation collection control switch 18 and a precipitation collection control knob 17 that works in conjunction with the precipitation collection control switch 18 are provided on the precipitation collection collection port 19. Turning the precipitation collection control knob 17 can turn the precipitation collection control switch 18 on or off. When the precipitation collection control switch 18 is turned on, the struvite precipitate flows out from the precipitation collection port 19 and is collected.

[0030] An inner circulation reaction tube 11 with the same center as the outer circulation reaction tube 12 is provided inside the outer circulation reaction tube 12, and the same reaction control cover plate 23 is provided on the top of the outer circulation reaction tube 12 and the outer circulation reaction tube 12.

[0031] The reaction control cover 23 is circular, with a gas guide pipe 7 inserted at its center. Along the circumference of the gas guide pipe 7, the reaction control cover 23 has one automatic alkali source inlet 2, two internal pressure vents 3, one nitrogen source inlet 4, one magnesium source inlet 5, and one phosphorus source inlet 6. Along the circumference of the gas guide pipe 7, the edge of the reaction control cover 23 has one pH detection port 1, one sampling port 10, and four pressure relief vents 9. The pH detection port 1 is connected to a Hash pH meter; the automatic alkali source inlet 2 is connected to the guide pipe of a pH peristaltic pump, into which a 1.0 mol / L sodium hydroxide solution flows; the pH control and recovery system is monitored by the Hash pH meter, set to pH=10. When the pH fluctuates by ±0.04, the power supply of the pH control module automatically activates or deactivates the pH peristaltic pump.

[0032] Nitrogen source inlet 4, magnesium source inlet 5, and phosphorus source inlet 6 are all externally connected to the same LM60A / LM60B peristaltic pump. In the continuous reaction system, the mixing intensity is maintained at 13.2 L / min within the continuous reaction zone. MgCl2·6H2O and NH4Cl solutions, as well as degraded phosphate solutions, are added through the peristaltic pump's guide tubes via nitrogen source inlet 4, magnesium source inlet 5, and phosphorus source inlet 6, respectively, and struvite is synthesized under alkaline conditions.

[0033] The gas delivery pipe 7 is connected to an external gas stirring pump, model KH-20S, with a maximum flow rate of 22 L / min. Gas is introduced through the gas delivery pipe 7, and the resulting bubbles rise in the liquid, promoting mixing within the liquid and ensuring sufficient contact between reactants, thereby improving reaction efficiency.

[0034] The Hash pH meter, pH peristaltic pump, LM60A / LM60B peristaltic pump, and gas stirring pump are all existing devices and will not be described in detail.

[0035] The internal pressure exhaust port 3 is connected to the internal circulation reaction pipe 11, and the gas in the internal circulation reaction pipe 11 is discharged through the internal pressure exhaust port 3; the pressure relief exhaust port 9 is connected to the external circulation reaction pipe 12, and the gas in the external circulation reaction pipe 12 is discharged through the pressure relief exhaust port 9.

[0036] Sampling port 10 is used to take out the solution to be discharged after the reaction for testing. Primary precipitation tube 14, secondary precipitation tube 15 and tertiary precipitation tube 16 are used to collect the synthesized struvite precipitate.

[0037] The reaction control cover plate 23 is equipped with a gas pipe height adjustment knob 8 for adjusting the height of the gas pipe 7. Specifically, a limiting sleeve is fitted on the gas pipe 7, and a bolt fastener is rotatably connected to the limiting sleeve. One end of the bolt fastener abuts against the gas pipe 7, and the other end is connected to the gas pipe height adjustment knob 8.

[0038] The circulating precipitation reaction device is fixed by a base at the bottom. The base consists of a base plate 20, a base side plate 21, and a base support 22. The base plate 20 is used to fix the circulating precipitation reaction device. The base side plate 21 is designed for easy gripping. Four base supports 22 are set at the four corners of the base plate 20 to facilitate the upright standing of the circulating precipitation reaction device.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model 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 solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A reaction device for realizing continuous phosphorus recovery and dynamic pH regulation, characterized in that, The device includes a circulating precipitation reaction apparatus, which, from top to bottom, comprises an integrally formed external circulation reaction tube, a primary precipitation tube, a secondary precipitation tube, a tertiary precipitation tube, and a precipitation collection port. An internal circulation reaction tube with the same center is provided inside the external circulation reaction tube. The external circulation reaction tube and the top of the external circulation reaction tube are provided with the same reaction control cover.

2. The reaction device for realizing continuous phosphorus recovery and dynamic pH regulation according to claim 1, characterized in that, The reaction control cover is circular, with a gas guide tube inserted at its center. Along the circumference of the gas guide tube, the reaction control cover has an automatic alkali source inlet, an internal pressure vent, a nitrogen source inlet, a magnesium source inlet, and a phosphorus source inlet. Along the circumference of the gas guide tube, the reaction control cover has a pH detection port, a sampling port, and a pressure relief vent. The pH detection port is connected to a Hash pH meter, the automatic alkali source inlet is connected to a pH peristaltic pump, and the nitrogen, magnesium, and phosphorus source inlets are all connected to the same peristaltic pump. The gas guide tube is connected to a gas stirring pump, and the sampling port is used to take out the solution to be discharged after the reaction for testing.

3. The reaction device for realizing continuous phosphorus recovery and dynamic pH regulation according to claim 2, characterized in that, The internal pressure vent is connected to the internal circulation reaction pipe, and the pressure relief vent is connected to the external circulation reaction pipe.

4. The reaction device for realizing continuous phosphorus recovery and dynamic pH regulation according to claim 1, characterized in that, The outer side of the external circulation reaction tube is provided with a drain port for discharging the solution after the reaction.

5. The reaction apparatus for continuous phosphorus recovery and dynamic pH control as described in claim 2, characterized in that, The reaction control cover is equipped with a gas pipe height adjustment knob for adjusting the height of the gas pipe. A limit sleeve is fitted on the gas pipe, and a bolt fastener is rotatably connected to the limit sleeve. One end of the bolt fastener abuts against the gas pipe, and the other end is connected to the gas pipe height adjustment knob.

6. The reaction apparatus for continuous phosphorus recovery and dynamic pH control as described in claim 2, characterized in that, The sedimentation collection port is equipped with a sedimentation collection control switch and a sedimentation collection control knob that works in conjunction with the sedimentation collection control switch.

7. A reaction device for realizing continuous phosphorus recovery and dynamic pH adjustment according to any one of claims 1-6, characterized in that, The circulating precipitation reaction device is fixed by a base at the bottom, which consists of a base plate, a base side plate, and a base support.

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