Sewage treatment equipment based on compound fertilizer production

Abstract

The invention relates to the technical field of sewage treatment, and discloses sewage treatment equipment based on compound fertilizer production, which comprises a grid, an emergency treatment assembly and a main sewage treatment assembly, a three-way valve is arranged at the water outlet end of the grid through a pipeline, the main sewage treatment assembly comprises a buffer tank, an ion exchange tower assembly and a biological treatment assembly which are sequentially communicated through pipelines along the treatment flow, and a water outlet of the biological treatment assembly is communicated with the constructed wetland; the ion exchange tower assembly is also provided with a sludge outlet end, and the sludge outlet end is communicated with the electro-deposition device; through cooperation of the ion exchange tower assembly and the biological treatment assembly, cooperation of magnetic ion exchange resin, pulse resonance and magnetic regulation and control and assistance of the regeneration assembly, wastewater is deeply purified, and nitrogen and phosphorus resources are recycled; and the environment-friendly and economic dual effects of low energy consumption and less resource waste are achieved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a wastewater treatment device for compound fertilizer production. Background Technology

[0002] Phosphorus-containing wastewater treatment has always been an environmental problem that plagues compound fertilizer enterprises. The main method for treating inorganic phosphorus is chemical precipitation, which is based on the principle of converting phosphate into precipitates and solidifying them. The solidified waste is then disposed of as ordinary solid waste. The wastewater treatment process is energy-intensive and costly, and the recovery and utilization of nitrogen and phosphorus is not thorough enough, resulting in resource waste. Summary of the Invention

[0003] The purpose of this invention is to provide a wastewater treatment device for compound fertilizer production that achieves deep purification of wastewater and recovery of nitrogen and phosphorus resources through the synergy of ion exchange tower components and biological treatment components, the coordination of magnetic ion exchange resin with pulse resonance and magnetic regulation, and the assistance of regeneration components, thereby achieving the dual effects of low energy consumption and minimal resource waste in environmental protection and economy, thus solving the problems mentioned in the background art.

[0004] To achieve the above objectives, a wastewater treatment device for compound fertilizer production is provided, comprising a screen, an emergency treatment component, and a main wastewater treatment component. The outlet of the screen is connected to a three-way valve via a pipeline. The two outlets of the three-way valve are respectively connected to the inlets of the emergency treatment component and the main wastewater treatment component via pipelines. The main wastewater treatment component includes a buffer tank, an ion exchange tower component, and a biological treatment component, which are sequentially connected along the treatment process via pipelines. The ion exchange tower component includes a first ion exchange tower, a second ion exchange tower, and a backup ion exchange tower arranged in parallel. The outlet of the biological treatment component is connected to an artificial wetland. The ion exchange tower component also has a sludge discharge end, which is connected to an electrodeposition device. The emergency treatment component is an MBR wastewater treatment device.

[0005] In one possible implementation, the first ion exchange tower, the second ion exchange tower and the standby ion exchange tower have the same structure; the first ion exchange tower is provided with a cyclone pre-distributor, a fluidized bed adsorption assembly and a pulse resonance assembly in sequence from the inlet end to the outlet end, and the top and bottom ends of the tower are provided with inlet and outlet port flange assemblies.

[0006] In one possible implementation, the cyclone pre-distributor includes an exchange tower stirring motor, double helical blades, and a porous rectifier plate arranged sequentially from top to bottom at the motor fixing flange at the top of the tower body; wherein, an exchange tower rotating shaft extends downward from the exchange tower stirring motor, and a central shaft sleeve is fixedly connected to the outside of the exchange tower rotating shaft by a pin, the double helical blades are arranged symmetrically with respect to the central shaft sleeve, and the porous rectifier plate is located below the double helical blades and fits against the inner wall of the tower body.

[0007] In one possible implementation, the fluidized bed adsorption assembly includes a resin support ring, resin circulation channels, axial flow channels, and a magnetic control coil; wherein, the resin support ring is circumferentially fixed to the bottom of the fluidized bed adsorption assembly along the inner wall of the tower body; multiple resin circulation channels are evenly distributed along the inner wall of the tower body; the axial flow channels are fixedly connected to the rotating shaft of the exchange tower by a pin, and the axial flow channels are located above the resin support ring; the magnetic control coil is fitted onto the outside of the tower body and corresponds to the arrangement position of the fluidized bed adsorption assembly.

[0008] In another possible implementation, a propeller is provided on the outside of the exchange tower shaft via a pin, and the propeller is located between the axial flow propeller and the porous rectifier plate.

[0009] In one possible implementation, the pulse resonance assembly includes an annular gas distribution network and multiple pulse release nozzles; wherein, the annular gas distribution network is circumferentially fixed to the inner wall of the tower body below the fluidized bed adsorption assembly; the pulse release nozzles are all disposed on the annular gas distribution network and arranged in the direction of the fluidized bed adsorption assembly.

[0010] In one possible implementation, the angle between the pulse release nozzle and the axis of the tower body is 30-60 degrees; it also includes an air inlet pipe that connects an external air source to an annular air distribution network.

[0011] In one possible implementation, the inlet and outlet flange assembly includes a top inlet flange, a bottom outlet flange, a resin replenishment port, and a maintenance manhole. The top inlet flange is located at the center of the top of the tower body and is connected to an external pipeline; the bottom outlet flange is located at the center of the bottom of the tower body and is connected to the inlet of the biological treatment component; the resin replenishment port is located on the side wall of the tower body, above the fluidized bed adsorption component; the maintenance manhole is located on the side wall of the tower body, in the middle section of the fluidized bed adsorption component, and has an observation window; the tops of the first ion exchange tower, the second ion exchange tower, and the standby ion exchange tower are all connected to the outlet of the buffer tank through pipelines.

[0012] In one possible implementation, the ion exchange tower assembly further includes a PLC control box, a regeneration component, and a cleaning water tank; wherein, the regeneration component is equipped with a regeneration tank preparation tank, which is connected to a first multi-way valve via a regenerant delivery pump, and the first multi-way valve is connected to an acid regenerant storage tank and an alkali regenerant storage tank via delivery pipes; the acid regenerant storage tank and the alkali regenerant storage tank are connected to a first ion exchange tower, a second ion exchange tower, and a standby ion exchange tower via a second multi-way valve and delivery pipes, and each delivery pipe is equipped with a regeneration valve and a pneumatic ball valve; the cleaning water tank is connected to each ion exchange tower via a third multi-way valve and delivery pipes.

[0013] The cleaning water tank is equipped with a backwash water pump and a cleaning water pump on the corresponding delivery pipes of each ion exchange tower; pressure gauges and flow meters are also installed on the key pipelines of each ion exchange tower; the PLC control box is electrically connected to the regenerant delivery pump, backwash water pump, cleaning water pump, each regeneration valve, each pneumatic ball valve, each multi-way valve, pressure gauge and flow meter, and is used to realize the automatic control and operation monitoring of the ion exchange tower components.

[0014] In one possible implementation, the biological treatment component includes a soilless cultivation greenhouse connected to the outlet of the ion exchange tower component. The soilless cultivation greenhouse is provided with a fast-growing bioreactor layer, a vertical hydroponic plant layer, and an animal feeding layer that are connected sequentially along the treatment process.

[0015] Compared with the prior art, the present invention has the following advantages: 1. By adopting parallel operation of the ion exchange towers, the operating mode can be flexibly switched to ensure the continuity and reliability of the system; the cyclone pre-distributor is driven by a stirring motor to stir and swirl the double helical blades, and the porous rectifier plate is used to rectify the flow, so that the wastewater enters the fluidized bed adsorption component evenly. Then, the axial slurry pushes the resin to circulate, the magnetic control coil adjusts the magnetic field to make the magnetic resin evenly dispersed, and the pulse resonance component disturbs the resin with pulsed gas. The three work together to greatly improve the adsorption efficiency of heavy metals.

[0016] 2. Through the coordination of multi-way valves, transfer pumps, and pump valves, automatic resin regeneration and cleaning are achieved, ensuring the continuous and stable adsorption capacity of the resin and reducing operating costs.

[0017] 3. Wastewater is treated sequentially through a fast-growing bioreactor, a vertical hydroponic plant layer, and an animal feeding layer. Nitrogen and phosphorus are absorbed in layers, and residues are utilized to achieve resource recovery and produce a variety of economic products. Attached Figure Description

[0018] Figure 1 This is an isometric view of the wastewater treatment equipment of the present invention; Figure 2 This is a top view of the main wastewater treatment component of the present invention; Figure 3 This is an isometric view of the first ion exchange tower of the present invention; Figure 4 For the present invention Figure 3 AA diagram; Figure 5 This is an isometric view of the swirl pre-distributor of the present invention; Figure 6 This is an isometric view of the axial flow of the present invention; Figure 7 This is an isometric view of the second embodiment of the switching tower shaft of the present invention; Figure 8 For the present invention Figure 3 A magnified view of part A; Figure 9 This is a schematic diagram of the control of the water treatment component of the present invention; Figure 10 This is a schematic diagram of the biological treatment component of the present invention.

[0019] In the diagram: 1. Grille; 2. Pipeline; 3. Emergency treatment assembly; 4. Main wastewater treatment assembly; 5. Buffer tank; 6. Ion exchange tower assembly; 601. First ion exchange tower; 602. Second ion exchange tower; 603. Backup ion exchange tower; 604. Tower body; 605. Cyclone pre-distributor; 606. Fluidized bed adsorption assembly; 607. Pulse resonance assembly; 608. Inlet / outlet flange assembly; 609. Double helical blades; 610. Exchange tower stirring motor; 611. Porous rectifier plate; 612. Resin support ring; 613. Resin circulation channel; 614. Axial flow; 615. Magnetic control coil; 616. Annular gas distribution network; 617. Pulse release nozzle; 61 9. Top inlet flange; 620. Bottom outlet flange; 621. Resin replenishment port; 622. Inspection manhole; 623. Propeller; 624. Air inlet pipe; 626. Central bushing; 627. Exchange tower shaft; 670. PLC control box; 680. Regeneration assembly; 681. Regenerant preparation tank; 682. Delivery pipe; 683. Acid regenerant storage tank; 684. Alkali regenerant storage tank; 685. Regenerant delivery pump; 690. Cleaning water tank; 691. Backwash water pump; 692. Cleaning water pump; 7. Biological treatment assembly; 701. Soilless cultivation greenhouse; 703. Auxiliary equipment; 704. Fast-growing bioreactor layer; 705. Vertical hydroponic plant layer; 706. Animal feeding layer. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] In one implementation, such as Figure 1-4The wastewater treatment equipment shown includes a screen 1, an emergency treatment component 3, and a main wastewater treatment component 4. The outlet of the screen 1 is connected to a three-way valve via a pipe 2. The two outlets of the three-way valve are connected to the inlets of the emergency treatment component 3 and the main wastewater treatment component 4 via pipes 2, respectively. The main wastewater treatment component 4 includes a buffer tank 5, an ion exchange tower assembly 6, and a biological treatment component 7, which are sequentially connected along the treatment process via pipes 2. The ion exchange tower assembly 6 includes a first ion exchange tower 601, a second ion exchange tower 602, and a backup ion exchange tower 603 arranged in parallel. The outlet of the biological treatment component 7 is connected to an artificial wetland. The ion exchange tower assembly 6 also has a sludge discharge end, which is connected to an electrodeposition device. The emergency treatment component 3 is an MBR wastewater treatment device.

[0022] In this embodiment, the bar screen 1 is used to intercept large particulate impurities in the wastewater to prevent the subsequent pipeline 2 from clogging or damaging the relevant treatment components; the three-way valve is an electric three-way valve and is electrically connected to the PLC control box 670. The PLC control box 670 automatically switches the connection path according to the operating status of the main wastewater treatment component 4. When the main wastewater treatment component 4 is operating normally, the three-way valve connects to the main wastewater treatment component 4, and the wastewater enters the normal treatment process; when the main wastewater treatment component 4 malfunctions or needs maintenance, the three-way valve quickly switches to the emergency treatment component 3 to ensure continuous wastewater treatment and avoid direct discharge of wastewater causing environmental pollution.

[0023] The buffer tank 5 is connected to the outlet of the screen 1 via the pipe 2. It is used to receive the wastewater pretreated by the screen 1, to regulate the water volume and balance the water quality, and to prevent fluctuations in wastewater flow or water quality from affecting the treatment effect of the subsequent ion exchange tower component 6. The bottom of the buffer tank 5 is provided with a conical sludge collection area, which facilitates the deposition of a small amount of fine impurities that are not intercepted by the screen 1. The buffer tank 5 is equipped with a liquid level sensor and a water quality monitoring sensor to monitor parameters such as water level, pH value of wastewater, and suspended solids concentration. In addition, a drain outlet is provided at the bottom of the buffer tank 5, which is periodically opened by the PLC control box 670 to discharge the deposited fine impurities.

[0024] In one possible implementation, the first ion exchange tower 601, the second ion exchange tower 602 and the standby ion exchange tower 603 have the same structure; the tower body 604 of the first ion exchange tower 601 is provided with a cyclone pre-distributor 605, a fluidized bed adsorption assembly 606 and a pulse resonance assembly 607 in sequence from the water inlet end to the water outlet end, and the top and bottom ends of the tower body 604 are provided with water inlet and outlet port flange assemblies 608.

[0025] In this embodiment, the first ion exchange tower 601, the second ion exchange tower 602, and the standby ion exchange tower 603 are all connected to the outlet of the buffer tank 5 via pipe 2, and their bottom ends are all connected to the inlet of the biological treatment component 7 via pipe 2. Under normal treatment capacity, the first ion exchange tower 601 and the second ion exchange tower 602 operate simultaneously, while the standby ion exchange tower 603 is in standby mode. When the wastewater treatment volume is large, all three ion exchange towers can be put into operation simultaneously to improve treatment efficiency. When one of the ion exchange towers needs regeneration or maintenance, the operation can be switched to the other two ion exchange towers via a valve without affecting the overall wastewater treatment process, significantly improving the continuity and reliability of the system.

[0026] In one possible implementation, the cyclone pre-distributor 605 includes an exchange tower stirring motor 610, double helix blades 609, and a porous rectifier plate 611 arranged sequentially from top to bottom at the motor fixing flange at the top of the tower body 604; wherein, an exchange tower rotating shaft 627 extends downward from the exchange tower stirring motor 610, and a central bushing 626 is fixedly connected to the outside of the exchange tower rotating shaft 627 by a pin, the double helix blades 609 are arranged symmetrically with respect to the central bushing 626, and the porous rectifier plate 611 is located below the double helix blades 609 and fits against the inner wall of the tower body 604.

[0027] In this embodiment, the exchange tower stirring motor 610 is fixed to the center of the top of the tower body 604 via a motor fixing flange. The exchange tower stirring motor 610 is a variable frequency speed control motor, electrically connected to the PLC control box 670, and its speed can be adjusted according to the wastewater treatment volume and water quality. An exchange tower rotating shaft 627 extends downward from the output shaft of the exchange tower stirring motor 610, and a central bushing 626 is fixedly connected to the outside of the exchange tower rotating shaft 627 via a pin. The double helical blades 609 are symmetrically arranged along the axis of the central bushing 626, and the blade edges... A gap is left between the flange and the inner wall of the tower body 604 to ensure the stirring effect and avoid friction with the tower body 604. When the stirring motor 610 drives the rotating shaft 627 of the exchange tower to rotate, it drives the double helix blades 609 to rotate synchronously, which plays a strong stirring and swirling role on the wastewater entering the tower body 604 from the top water inlet flange 619. This makes the wastewater form a rotating water flow in the tower body, which not only allows the wastewater to be evenly distributed on the cross-section of the tower body, but also initially disperses the small particles and flocs in the wastewater, creating good conditions for the subsequent ion exchange reaction.

[0028] Secondly, the porous rectifier plate 611 is located below the double helix blades 609 and is tightly fitted to the inner wall of the tower body 604. The plate is uniformly provided with multiple through holes, which are distributed in a regular hexagonal array to ensure that the wastewater can pass through evenly. The edge of the porous rectifier plate 611 is fixedly connected to the inner wall of the tower body 604 by welding. The connection is provided with reinforcing ribs to improve structural stability. When the swirling wastewater stirred by the double helix blades 609 flows through the porous rectifier plate 611, the rectifier effect of the through holes transforms the swirling water flow into a stable axial water flow, so that the wastewater enters the fluidized bed adsorption component 606 below with a uniform flow rate and distribution. This avoids the local flow rate being too fast or too slow, which would affect the ion exchange effect, and ensures that the wastewater and ion exchange resin are in full contact.

[0029] In one possible implementation, the fluidized bed adsorption assembly 606 includes a resin support ring 612, a resin circulation channel 613, an axial flow 614, and a magnetic control coil 615. The resin support ring 612 is circumferentially fixed to the bottom of the fluidized bed adsorption assembly 606 along the inner wall of the tower body 604. Multiple resin circulation channels 613 are evenly distributed along the inner wall of the tower body 604. The axial flow 614 is fixedly connected to the exchange tower shaft 627 via a pin and is positioned above the resin support ring 612. The magnetic control coil 615 is fitted onto the outside of the tower body 604 and corresponds to the arrangement position of the fluidized bed adsorption assembly 606.

[0030] In this embodiment, the fluidized bed adsorption assembly 606 is located below the cyclone pre-distributor 605. The resin support ring 612 is fixed circumferentially to the bottom of the fluidized bed adsorption assembly 606 along the inner wall of the tower body 604. The inner diameter of the resin support ring 612 is slightly smaller than the inner diameter of the tower body 604 to ensure full support of the ion exchange resin in the fluidized bed and prevent the resin from falling into the pulse resonance assembly 607 area below. The upper surface of the resin support ring 612 is provided with anti-slip texture to enhance the friction between the resin and the support ring, prevent the resin from sliding excessively under the action of water flow, and at the same time not affect the normal passage of wastewater.

[0031] Secondly, multiple resin circulation channels 613 are evenly arranged along the inner wall of the tower body 604, with an included angle of 30-45 degrees between two adjacent resin circulation channels 613. This ensures that the resin circulation evenly covers the entire cross-section of the tower body, enabling the ion exchange resin to circulate and avoid some resin from remaining for a long time, which would lead to uneven adsorption saturation. At the same time, it promotes full contact between the resin and the wastewater, improving the resin utilization rate and adsorption efficiency.

[0032] Furthermore, when the ion exchange tower shaft 627 rotates, it drives the axial slurry 614 to rotate, generating a strong axial thrust. This propels the wastewater and ion exchange resin towards the lower inlet of the resin circulation channel 613. Then, under the action of the water flow, the resin flows out at the upper outlet of the resin circulation channel 613, thus forming a circulating flow of the resin. This keeps the resin in a suspended state within the fluidized bed adsorption component 606, allowing it to fully contact the wastewater and undergo an ion exchange reaction, efficiently adsorbing heavy metal elements in the wastewater.

[0033] In another possible implementation, a propeller 623 is provided on the outside of the exchange tower shaft 627 via a pin, and the propeller 623 is located between the axial flow propeller 614 and the porous rectifier plate 611.

[0034] In this embodiment, the propeller 623 includes a hub and multiple blades evenly distributed around the hub. The hub is fixedly connected to the exchange tower shaft 627 via a pin to ensure a firm connection. When the propeller 623 rotates synchronously with the exchange tower shaft 627, it generates axial thrust, which further enhances the stirring effect of the wastewater and promotes full contact between the wastewater and the ion exchange resin in the fluidized bed adsorption assembly 606. At the same time, it can prevent the ion exchange resin from accumulating above the porous rectifier plate 611, ensuring smooth water flow and improving ion exchange efficiency.

[0035] The magnetic control coil 615 is electrically connected to the PLC control box 670. The input current of the coil is adjusted by the PLC control box 670, thereby adjusting the intensity of the generated magnetic field. In this embodiment, the ion exchange resin selected is a magnetic ion exchange resin, which has magnetic particles loaded on its surface. Under the action of the magnetic field generated by the magnetic control coil 615, the adsorption and dispersion states can be flexibly adjusted. When it is necessary to enhance the contact between the resin and the wastewater, the coil current is increased by the PLC control box 670 to increase the magnetic field intensity, so that the magnetic resin is uniformly dispersed in the wastewater under the action of the magnetic field. When it is necessary to promote resin circulation or regeneration, the magnetic field intensity is appropriately reduced to reduce the obstruction of the magnetic field to the resin flow. The efficient circulation of the resin is achieved by the thrust of the axial flow slurry 614 and the disturbance of the pulse resonance component 607.

[0036] In one possible implementation, the pulse resonance assembly 607 includes an annular gas distribution network 616 and a plurality of pulse release nozzles 617; wherein, the annular gas distribution network 616 is circumferentially fixedly connected to the inner wall of the tower body 604 below the fluidized bed adsorption assembly 606; the pulse release nozzles 617 are all disposed on the annular gas distribution network 616 and are arranged in the direction of the fluidized bed adsorption assembly 606.

[0037] In one possible implementation, the angle between the pulse release nozzle 617 and the axis of the tower body 604 is 30-60 degrees; it also includes an air inlet pipe 624 that connects an external air source to the annular air distribution network 616.

[0038] In this embodiment, the annular gas distribution network 616 includes a main ring pipe and multiple branch pipes evenly distributed around the main ring pipe. The main ring pipe is coaxially arranged with the tower body 604, and the branch pipes are perpendicularly connected to the main ring pipe to form a complete gas distribution network. The annular gas distribution network 616 is fixed to the inner wall of the tower body 604 by a stainless steel bracket. The bracket is welded to the inner wall of the tower body 604 to ensure that the gas distribution network remains stable under the impact of pulsed gas.

[0039] Each branch pipe is equipped with multiple pulse release nozzles 617, all of which are arranged toward the fluidized bed adsorption assembly 606. The angle between the pulse release nozzles 617 and the axis of the tower body 604 is 30-60 degrees, preferably 45 degrees in this embodiment, so that the pulse gas can be injected obliquely upwards into the fluidized bed adsorption assembly 606 area to form a uniform pulse airflow field.

[0040] One end of the air inlet pipe 624 is connected to an external air compressor, and the other end is connected to the main ring pipe of the annular air distribution network 616. It is precisely controlled by the PLC control box 670 so that the pulse gas ejected from the pulse release nozzle 617 forms a periodic disturbance and resonance effect. The pulse airflow can not only strongly disturb the ion exchange resin in the fluidized bed adsorption component 606, preventing the resin from compacting and agglomerating under gravity, and ensuring that the resin is always in a suspended flow state; on the other hand, the pulse airflow forms a resonance effect with the wastewater and resin, enhances the mass transfer process on the resin surface, promotes the adsorption reaction of heavy metal elements on the resin surface, and at the same time helps the saturated resin to flow downward through the resin circulation channel 613, preparing for subsequent regeneration.

[0041] In one possible implementation, the inlet and outlet flange assembly 608 includes a top inlet flange 619, a bottom outlet flange 620, a resin replenishment port 621, and a maintenance manhole 622. The top inlet flange 619 is located at the center of the top of the tower body 604 and is connected to the external pipe 2; the bottom outlet flange 620 is located at the center of the bottom of the tower body 604 and is connected to the inlet of the biological treatment component 7; the resin replenishment port 621 is located on the side wall of the tower body 604, above the fluidized bed adsorption component 606; the maintenance manhole 622 is located on the side wall of the tower body 604, in the middle section of the fluidized bed adsorption component 606, and has an observation window; the tops of the first ion exchange tower 601, the second ion exchange tower 602, and the standby ion exchange tower 603 are all connected to the outlet of the buffer tank 5 through the pipe 2.

[0042] In one possible implementation, the ion exchange tower assembly 6 further includes a PLC control box 670, a regeneration assembly 680, and a cleaning water tank 690; wherein, the regeneration assembly 680 is provided with a regeneration tank preparation tank 681, which is connected to a first multi-way valve via a regenerant delivery pump 685, and the first multi-way valve is connected to an acid regenerant storage tank 683 and an alkali regenerant storage tank 684 via delivery pipes 682; the acid regenerant storage tank 683 and the alkali regenerant storage tank 684 are connected to the first ion exchange tower 601, the second ion exchange tower 602, and the standby ion exchange tower 603 via a second multi-way valve and delivery pipes 682, and each delivery pipe 682 is provided with a regeneration valve and a pneumatic ball valve; the cleaning water tank 690 is connected to each ion exchange tower via a third multi-way valve and delivery pipes 682.

[0043] The cleaning water tank 690 is equipped with a backwash water pump 691 and a cleaning water pump on the corresponding delivery pipe 682 of each ion exchange tower; pressure gauges and flow meters are also installed on the key pipelines of each ion exchange tower; the PLC control box 670 is electrically connected to the regenerant delivery pump 685, the backwash water pump 691, the cleaning water pump, each regeneration valve, each pneumatic ball valve, each multi-way valve, pressure gauges and flow meters, and is used to realize the automatic control and operation monitoring of the ion exchange tower assembly 6.

[0044] In this embodiment, the regeneration component 680 is used to regenerate the saturated ion exchange resin to restore its adsorption capacity. The regeneration tank preparation tank 681 is used to prepare the regenerant solution. The regenerant delivery pump 685 is electrically connected to the PLC control box 670, which controls its start / stop and flow rate adjustment. The first multi-way valve is an electric three-way valve, electrically connected to the PLC control box 670. Its three ports are respectively connected to the outlet of the regenerant delivery pump 685, the acid regenerant storage tank 683, and the alkali regenerant storage tank 684, for switching between acid and alkali regenerant delivery. The acid regenerant storage tank 683 and the alkali regenerant storage tank 684 are used to store acid and alkali regenerants, respectively.

[0045] The outlets of acid regenerant storage tank 683 and alkali regenerant storage tank 684 are connected to a second multi-way valve via conveying pipe 682. The second multi-way valve is an electric four-way valve, electrically connected to the PLC control box 670. Its four ports are respectively connected to the regenerant inlets of acid regenerant storage tank 683, alkali regenerant storage tank 684, first ion exchange tower 601, second ion exchange tower 602, and standby ion exchange tower 603, realizing precise delivery of regenerant to different ion exchange towers. Each conveying pipe 682 is equipped with a regeneration valve and a pneumatic ball valve. Both the regeneration valve and the pneumatic ball valve are electrically connected to the PLC control box 670, which automatically controls their opening and closing according to the regeneration process. The cleaning water tank 690 is used to store the cleaning water required during the resin regeneration process. The cleaning water tank 690 and the corresponding delivery pipe 682 of each ion exchange tower are equipped with a backwash water pump 691 and a cleaning water pump, which are electrically connected to the PLC control box 670. The PLC control box 670 controls their start-up, shutdown and flow regulation. Pressure gauges and flow meters are also installed on the key pipelines of each ion exchange tower and are electrically connected to the PLC control box 670 to transmit real-time monitoring data to the PLC control box 670.

[0046] The regeneration process of ion exchange tower component 6 is automatically controlled by PLC control box 670. The specific process is as follows: When a certain ion exchange tower (taking the first ion exchange tower 601 as an example) has been running for a period of time, the water quality sensor at its outlet detects that the heavy metal concentration exceeds the set value, indicating that the ion exchange resin in the tower has been saturated. PLC control box 670 first controls the inlet and outlet valves of the first ion exchange tower 601 to close, switching it from the running state to the regeneration state. At the same time, the backup ion exchange tower 603 is started to ensure that the overall treatment process is not interrupted.

[0047] The first step in the regeneration process is forward washing. The PLC control box 670 controls the start of the cleaning water pump corresponding to the cleaning water tank 690. The third multi-way valve is switched to connect with the first ion exchange tower 601. The cleaning water enters the tower body 604 from the top inlet flange 619 of the first ion exchange tower 601 through the delivery pipe 682 to perform forward washing on the ion exchange resin, rinsing off impurities and pollutants that are not completely adsorbed on the resin surface. The wastewater generated by forward washing is discharged through the drain port at the bottom of the first ion exchange tower 601 and transported to the sludge collection device through the pipeline 2.

[0048] After the forward wash is completed, the PLC control box 670 controls the cleaning water pump to stop running, and the third multi-way valve switches to the closed state, entering the regenerant delivery stage. According to the type of ion exchange resin, the PLC control box 670 selects the corresponding regenerant. If it is a cation exchange resin, an acid regenerant is selected; if it is an anion exchange resin, an alkali regenerant is selected.

[0049] Taking acid regeneration as an example, the PLC control box 670 controls the first multi-way valve to switch to connect with the acid regenerator storage tank 683, and the second multi-way valve to switch to connect with the first ion exchange tower 601. At the same time, it controls the regenerator delivery pump 685 to start. The acid regenerator is delivered from the acid regenerator storage tank 683 to the regeneration tank preparation tank 681 through the delivery pipe 682. It is mixed and diluted with water in the tank to the set concentration. After being fully stirred by the stirring device, it is delivered to the first ion exchange tower 601 by the regenerator delivery pump 685. The regenerator solution enters the tower body 604 from the bottom outlet flange 620 of the first ion exchange tower 601. The regeneration method is adopted to fully contact the ion exchange resin that is saturated with adsorption in the tower and a regeneration reaction occurs. The heavy metal elements adsorbed by the resin are replaced and the adsorption capacity of the resin is restored. The waste liquid generated during the regeneration process is discharged through the drain outlet at the top of the first ion exchange tower 601 and transported to the waste liquid treatment device through the pipeline 2.

[0050] After the regenerant is delivered, the PLC control box 670 controls the regenerant delivery pump 685 to stop running, and the first multi-way valve and the second multi-way valve switch to the closed state, entering the backwashing stage. The PLC control box 670 controls the backwash water pump 691 to start, and the cleaning water enters the tower body 604 from the bottom outlet flange 620 of the first ion exchange tower 601 to backwash the regenerated resin, rinse the residual regenerant and regeneration reaction products, and the backwash wastewater is discharged to the waste liquid treatment device through the top drain outlet.

[0051] After backwashing is completed, the PLC control box 670 controls the backwash water pump 691 to stop running and restarts the cleaning water pump for a second forward wash until the water quality sensor at the outlet of the first ion exchange tower 601 detects that the effluent water quality meets the standard. Then, the PLC control box 670 controls the cleaning water pump to stop running, the regeneration process is completed, and the first ion exchange tower 601 switches to standby mode. When other ion exchange towers need to be regenerated or the processing capacity increases, the PLC control box 670 can control them to be put back into operation.

[0052] In one possible implementation, the biological treatment component 7 includes a soilless cultivation greenhouse 701 connected to the outlet of the ion exchange tower component 6. The soilless cultivation greenhouse 701 is provided with a fast-growing bioreactor layer 702, a vertical hydroponic plant layer 703 and an animal feeding layer 704 connected sequentially along the treatment process.

[0053] The fast-growing bioreactor layer 702 uses a duckweed / algae photobioreactor for preliminary water purification, which is used to efficiently absorb nitrogen and phosphorus elements and produce protein feed raw materials. The vertical hydroponic plant layer 703 uses a vertical multi-layer hydroponic system and deep liquid flow or nutrient film technology to grow hydroponic pasture or leafy vegetables, producing high-quality clear feed or organic vegetables. The animal feeding layer 704 uses the remaining residue to feed insects (such as black soldier flies), producing insect protein and insect excrement, which not only achieves efficient resource utilization, but also produces a variety of economic products. Finally, the treated effluent is sent to an artificial wetland for natural purification.

[0054] In this embodiment, the biological treatment component 7 is located behind the ion exchange tower component 6 and is connected to the bottom outlet flange 620 of the three ion exchange towers via the pipe 2. It is used to receive the wastewater after ion exchange treatment, further purify the wastewater and realize the recovery and utilization of nitrogen and phosphorus resources.

[0055] The biological treatment component 7 includes a soilless cultivation greenhouse 701. The soilless cultivation greenhouse 701 adopts a steel structure frame, and the top and sides of the greenhouse are covered with light-transmitting coverings to ensure the light conditions required for the growth of plants inside. At the same time, it has good heat preservation performance to keep the temperature inside the greenhouse within a suitable range for plant growth. The soilless cultivation greenhouse 701 is equipped with a fast-growing bioreactor layer 702, a vertical hydroponic plant layer 703, and an animal feeding layer 704 that are connected sequentially along the treatment process. The layers are connected by a guide channel or pipe 2 to ensure that wastewater flows through each layer sequentially for gradient treatment.

[0056] The fast-growing bioreactor layer 702 is located at the inlet end of the soilless cultivation greenhouse 701 and is connected to the bottom outlet flange 620 of the ion exchange tower component 6 through pipe 2. It is the first stage of biological treatment. The fast-growing bioreactor layer 702 adopts duckweed / algae photobioreactor. The number of water tanks can be set according to the treatment scale, and they can be operated in parallel or series. Duckweed or algae are cultivated in the water tanks. Duckweed / algae have the characteristics of fast growth rate and strong nitrogen and phosphorus absorption capacity. They can efficiently absorb residual nitrogen and phosphorus elements in wastewater. At the same time, through photosynthesis, the duckweed / algae produced can be collected and utilized as protein feed raw materials.

[0057] The fast-growing bioreactor layer 702 is equipped with an aeration device, including aeration pipes and aeration heads. The aeration pipes are laid at the bottom of the water tank, and the aeration heads are evenly distributed on the aeration pipes. The aeration pipes are connected to an external air compressor through pipe 2. Aeration increases the dissolved oxygen content in the water, promoting the photosynthesis and growth of duckweed / algae. The water tank is equipped with a water quality sensor to monitor parameters such as nitrogen and phosphorus concentration, dissolved oxygen, and pH value in the wastewater in real time. The sensor signals are transmitted to the PLC control box 670.

[0058] The bottom of the fast-growing bioreactor layer 702 is equipped with a sludge discharge port, which is connected to a sludge collection pipe. A small amount of deposited sludge is discharged periodically. When duckweed / algae grow to a certain density, it is collected manually or mechanically. After collection, the duckweed / algae is dehydrated and dried, and then stored as a protein feed raw material for later use, thus realizing resource recycling.

[0059] The vertical hydroponic plant layer 703 is located behind the fast-growing bioreactor layer 702 and is connected to the fast-growing bioreactor layer 702 through a guide channel. It receives the wastewater treated by the fast-growing bioreactor layer 702 and is the second stage of biological treatment. The vertical hydroponic plant layer 703 has multiple cultivation troughs arranged vertically to ensure that the upper plants do not block the light of the lower plants and improve space utilization.

[0060] Vertical hydroponics systems can employ deep flow or nutrient film technology. In this embodiment, deep flow technology is preferred. Wastewater is maintained at a certain depth in the cultivation trough, and plant roots are immersed in the water to absorb nutrients and water. Hydroponic forage or leafy vegetables, such as ryegrass, lettuce, and romaine lettuce, are planted in the cultivation trough. These plants have a good absorption capacity for nutrients such as nitrogen and phosphorus in the wastewater, which can further purify the wastewater and produce high-quality green fodder or organic vegetables, thus realizing resource reuse.

[0061] The animal feeding layer 704 is located behind the vertical hydroponic plant layer 703 and is connected to the water collection tank through pipe 2. It receives the wastewater treated by the vertical hydroponic plant layer 703. The wastewater contains a small amount of organic matter and solid residue. The animal feeding layer 704 uses these remaining residues to feed insects, thus achieving deep recycling of resources.

[0062] The enclosure is equipped with temperature and humidity sensors to monitor the temperature and humidity of the rearing environment in real time.

[0063] After black soldier fly larvae grow to a certain stage, they are collected through artificial screening, and after dehydration, drying, and crushing, insect protein is produced. The insect protein can be sold and utilized as aquatic feed or livestock feed raw material. The excrement of black soldier flies, namely insect excrement, is rich in organic nutrients and can be collected as organic fertilizer for compound fertilizer production or crop planting, thus achieving efficient utilization of resources.

[0064] The biological treatment component 7 also includes auxiliary equipment, including solar panels, wind turbines and indoor light guide lighting equipment installed in the plant area. The indoor light guide lighting equipment includes multiple light-collecting devices installed in the plant area, and an indoor diffuser installed inside the soilless cultivation greenhouse 701 and connected to the light-collecting devices via light guides, for providing full-spectrum irradiation to the soilless cultivation greenhouse 701.

[0065] In this embodiment, the biological treatment component 7 also includes auxiliary equipment, including solar panels, wind turbines and indoor light guide lighting equipment installed in the plant area, which are used to provide clean energy and supplementary lighting for the entire wastewater treatment system, thereby reducing energy consumption and operating costs.

[0066] The constructed wetland is located behind the soilless cultivation greenhouse 701 and is connected to the drainage outlet of the animal feeding layer 704 through pipe 2. It serves as a deep purification unit for the entire wastewater treatment system, used to treat the effluent after treatment by the biological treatment component 7, and further remove pollutants such as organic matter, nitrogen, and phosphorus from the effluent.

[0067] During operation, the wastewater generated during the compound fertilizer production process is first transported to the screen 1 through a pipeline. The screen 1 intercepts large particulate impurities in the wastewater. The pretreated wastewater flows into the pipeline 2 and enters the electric three-way valve. The PLC control box 670 controls the three-way valve to switch the connection path according to the wastewater treatment volume, water quality, and the operating status of the main wastewater treatment component 4. When the main wastewater treatment component 4 is operating normally, the wastewater enters the buffer tank 5 through the pipeline 2. The buffer tank 5 adjusts the water volume and balances the water quality. After the level sensor and water quality sensor detect that the water is qualified, the wastewater is transported through the pipeline 2 to the first ion exchange tower 601 and the second ion exchange tower 602 of the ion exchange tower component 6.

[0068] Wastewater enters the first ion exchange tower 604 from the top inlet flange 619. It first flows through the cyclone pre-distributor 605. The exchange tower stirring motor 610 drives the double helical blades 609 to rotate, stirring and swirling the wastewater. The porous rectifier plate 611 rectifies the wastewater, allowing it to enter the fluidized bed adsorption assembly 606 evenly. The magnetic ion exchange resin in the fluidized bed adsorption assembly 606 comes into full contact with the wastewater under the thrust of the axial flow slurry 614 and the magnetic field of the magnetic control coil 615, adsorbing heavy metal elements in the wastewater. The pulse release nozzle 617 of the pulse resonance assembly 607 sprays pulsed gas to disturb and resonate the resin, promoting the adsorption reaction. The treated wastewater is discharged from the bottom outlet flange 620 and transported to the biological treatment assembly 7 through the pipeline 2.

[0069] After entering the biological treatment component 7, the wastewater first flows through the fast-growing bioreactor layer 702, where duckweed / algae absorb nitrogen and phosphorus elements from the wastewater to grow and reproduce, thus initially purifying the wastewater. Subsequently, the wastewater flows into the vertical hydroponic plant layer 703, where hydroponic forage or leafy vegetables further absorb residual nutrients, deepening the purification effect. Next, the wastewater enters the animal feeding layer 704, where black soldier flies utilize the remaining residue in the wastewater to grow, achieving resource recovery. Finally, the treated effluent is sent to the constructed wetland, where it undergoes deep purification through the synergistic effect of aquatic plants and microorganisms, and is discharged or recycled after meeting the standards.

[0070] Throughout the entire treatment process, the PLC control box 670 monitors the operating status of each component and water quality parameters in real time, automatically controlling the start and stop of pumps and valves, flow regulation, and the execution of the regeneration process to ensure stable and efficient operation of the equipment. Auxiliary equipment such as solar panels and wind turbines provide clean energy to the system, while indoor light-guiding lighting equipment supplements illumination, reducing energy consumption and operating costs. Heavy metal precipitates generated by ion exchange tower component 6 are recovered via electrodeposition, and biological treatment component 7 produces protein feed ingredients, green fodder, organic vegetables, insect protein, and organic fertilizer, achieving full recovery and utilization of nitrogen and phosphorus resources. This solves the problems of high energy consumption and resource waste associated with traditional treatment processes, demonstrating significant environmental and economic benefits.

[0071] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sewage treatment device for compound fertilizer production, comprising a grid, an emergency treatment assembly and a main sewage treatment assembly; the water outlet end of the grid is provided with a three-way valve through a pipeline, and the two outlets of the three-way valve are respectively connected to the water inlet ends of the emergency treatment assembly and the main sewage treatment assembly through pipelines, characterized in that: The main sewage treatment assembly comprises a buffer tank, an ion exchange tower assembly and a biological treatment assembly which are sequentially connected in sequence along a treatment flow through a pipeline, wherein the ion exchange tower assembly comprises a first ion exchange tower, a second ion exchange tower and a standby ion exchange tower which are arranged in parallel; the water outlet of the biological treatment assembly is communicated with an artificial wetland; the ion exchange tower assembly is further provided with a sludge outlet end which is communicated with an electrodeposition device; and the emergency treatment assembly is an MBR sewage treatment device.

2. The sewage treatment apparatus for the production of compound fertilizers according to claim 1, characterized in that: The first ion exchange tower, the second ion exchange tower and the standby ion exchange tower have the same structure; the tower body of the first ion exchange tower is sequentially provided with a cyclone pre-distributor, a flow bed adsorption assembly and a pulse resonance assembly from the water inlet end to the water outlet end; and the top end and the bottom end of the tower body are provided with inlet and outlet water port flange assemblies.

3. The sewage treatment apparatus for the production of compound fertilizers according to claim 2, characterized in that: The cyclone pre-distributor comprises an exchange tower stirring motor, double helical blades and a porous rectifier plate which are sequentially arranged from top to bottom at the motor fixing flange of the top end of the tower body; wherein the exchange tower stirring motor extends downwardly to have an exchange tower shaft, a central shaft sleeve is fixedly connected to the outside of the exchange tower shaft through a pin shaft, the double helical blades are arranged in axial symmetry along the central shaft sleeve, and the porous rectifier plate is arranged below the double helical blades and is attached to the inner wall of the tower body.

4. The sewage treatment apparatus for the production of compound fertilizers according to claim 3, characterized in that: The flow bed adsorption assembly comprises a resin support ring, resin circulation channels, an axial flow slurry and a magnetic control coil; wherein the resin support ring is fixed to the bottom of the flow bed adsorption assembly along the inner wall of the tower body; a plurality of resin circulation channels are uniformly arranged along the inner wall of the tower body; the axial flow slurry is fixedly connected to the exchange tower shaft through a pin shaft, and is arranged above the resin support ring; and the magnetic control coil is sleeved on the outside of the tower body and corresponds to the arrangement position of the flow bed adsorption assembly.

5. The sewage treatment apparatus for the production of compound fertilizers according to claim 4, characterized in that: The outside of the exchange tower shaft is provided with a plug flow paddle through a pin shaft, and the plug flow paddle is arranged between the axial flow slurry and the porous rectifier plate.

6. The sewage treatment apparatus for the production of compound fertilizers according to claim 4, characterized in that: The pulse resonance assembly comprises a ring-shaped gas distribution pipe network and a plurality of pulse release nozzles; wherein the ring-shaped gas distribution pipe network is fixedly connected to the inner wall of the tower body below the flow bed adsorption assembly in a circumferential direction; the pulse release nozzles are arranged on the ring-shaped gas distribution pipe network and are arranged towards the flow bed adsorption assembly.

7. The sewage treatment apparatus for the production of compound fertilizers according to claim 6, characterized in that: The included angle between the pulse release nozzles and the axis of the tower body is 30-60 degrees; and the assembly further comprises an air inlet pipe which communicates an external air source with the ring-shaped gas distribution pipe network.

8. The sewage treatment apparatus for the production of compound fertilizers according to claim 7, characterized in that: The inlet and outlet water port flange assemblies comprise a top water inlet flange, a bottom water outlet flange, a resin supplement port and an inspection manhole; the top water inlet flange is arranged at the center of the top end of the tower body and is communicated with an external pipeline; the bottom water outlet flange is arranged at the center of the bottom end of the tower body and is communicated with the water inlet end of the biological treatment assembly; the resin supplement port is arranged on the side wall of the tower body and is located at the upper part of the flow bed adsorption assembly; the inspection manhole is arranged on the side wall of the tower body and is located at the middle section of the flow bed adsorption assembly, and an observation window is arranged on the inspection manhole; and the top ends of the first ion exchange tower, the second ion exchange tower and the standby ion exchange tower are communicated with the water outlet of the buffer tank through a pipeline.

9. The sewage treatment apparatus for the production of compound fertilizers according to claim 2, characterized in that: The ion exchange tower assembly further comprises a PLC control box, a regeneration assembly and a cleaning water tank; wherein the regeneration assembly is provided with a regeneration tank preparation tank, the regeneration tank preparation tank is connected to a first multi-way valve through a regeneration agent delivery pump, the first multi-way valve is connected to an acid regeneration agent storage tank and an alkali regeneration agent storage tank through delivery pipes respectively; the acid regeneration agent storage tank and the alkali regeneration agent storage tank are communicated with the first ion exchange tower, the second ion exchange tower and the standby ion exchange tower through a second multi-way valve and delivery pipes, and a regeneration valve and a pneumatic ball valve are arranged on each delivery pipe; the cleaning water tank is communicated with each ion exchange tower through a third multi-way valve and delivery pipes respectively.

10. The sewage treatment apparatus for the production of compound fertilizers according to claim 1, characterized in that: The biological treatment assembly comprises a soilless culture greenhouse communicated with the water outlet of the ion exchange tower assembly, and the soilless culture greenhouse is provided with a fast-growing biological reactor layer, a vertical hydroponic plant layer and an animal feeding layer which are communicated in sequence along a treatment flow.

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