Integrated system for advanced treatment and recycling of leachate in waste transfer station

Abstract

The invention relates to the field of garbage treatment, in particular to an integrated system for deeply treating and recycling leachate of a garbage transfer station. Comprising a liquid collection and solid-liquid separation module, a pretreatment module, an advanced treatment integrated skid-mounted module, a graded water supply module and an electric control and linkage module, the magnetic-control variable-rigidity filter pressing grating assembly has two working conditions, the assembly is in a low-rigidity state under the first working condition so that grating strips can rebound and solid desorption and deslagging can be achieved, and the assembly is in a high-rigidity state under the second working condition so that grating gaps can be kept stable, and the interception capacity during solid-liquid separation can be enhanced; therefore, garbage compression and solid-liquid separation are synchronously carried out, and the rear-end treatment load is reduced. By arranging the magnetic control variable-rigidity filter pressing grating assembly and triggering a low-rigidity desorption mechanism through a vibration threshold value, when vibration is increased due to attachments, the magnetic control variable-rigidity filter pressing grating assembly can be switched to a low-rigidity state, the attachments are bounced off, and after vibration is reduced, the magnetic control variable-rigidity filter pressing grating assembly is switched to high-rigidity interception to guarantee the screening capacity.

Description

Technical Field

[0001] This invention relates to the field of waste treatment, and in particular to an integrated system for the deep treatment and reuse of leachate from waste transfer stations. Background Technology

[0002] Waste transfer stations are key nodes in the municipal solid waste collection and transportation system, primarily responsible for waste collection, compression and transfer, temporary storage, and vehicle dispatching. During the processes of waste unloading, compression, temporary storage, loading, and station washing, a certain amount of leachate containing pollutants (also known as wastewater, station leachate, or compressed filtrate) is generated. Common engineering treatment routes for this type of leachate typically include a combination of pretreatment, biological treatment, and advanced treatment processes.

[0003] For example, the prior art disclosed in CN110328212B is a leachate treatment device for a waste transfer station, which includes an inlet end, a treatment box, a waste outlet, and a liquid separation cylinder. A maintenance door is hinged to one side of the treatment box, and a liquid outlet pipe is installed at the bottom of the other side of the treatment box. A control button is installed at one end of the treatment box, and a controller is installed inside the treatment box below the control button. A waste outlet is provided on the treatment box below the controller. A liquid guide seat is installed in the center of the bottom of the treatment box. A discharge seat is installed inside the treatment box above the liquid guide seat, and a liquid separation cylinder is provided inside the treatment box above the discharge seat.

[0004] Existing technologies have poor flexibility in solid-liquid separation processes, and the efficiency of adjusting the separation equipment according to the actual conditions of the solid is low. In order to solve the common problems in this field, this invention was made. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of current systems by proposing an integrated system for the deep treatment and reuse of leachate from waste transfer stations.

[0006] To overcome the shortcomings of the prior art, the present invention adopts the following technical solution:

[0007] An integrated system for the deep treatment and reuse of leachate from a waste transfer station includes a liquid collection and solid-liquid separation module, a pretreatment module, a skid-mounted integrated deep treatment module, a staged water supply module, and an electrical control and linkage module; wherein:

[0008] The liquid collection and solid-liquid separation module is located below the waste compression station and includes a leachate collection plate assembly and a magnetically controlled variable stiffness filter press assembly connected to the liquid outlet end of the leachate collection plate assembly.

[0009] The pretreatment module includes a regulating tank connected to the liquid outlet end of the magnetically controlled variable stiffness filter press assembly, and a pretreatment unit disposed at the water outlet end of the regulating tank. The pretreatment unit includes at least one of a filter screen, a sedimentation structure, or an air flotation structure.

[0010] The deep treatment integrated skid-mounted module is configured as an integrated skid-mounted frame structure, in which an MBR unit, an ultrafiltration unit, a nanofiltration unit, and an advanced oxidation unit are sequentially integrated along the water flow direction.

[0011] The graded water supply module includes a water quality analysis unit, a return component, a graded water storage component, and a graded water distribution component. The water quality analysis unit is used to analyze the water quality of the recycled water. The return component is used to return the recycled water to the deep treatment integrated skid-mounted module for further treatment when the water quality analysis fails. The graded water storage component includes at least two grades of recycled water tanks. The graded water distribution component is used to automatically allocate the recycled water to the corresponding grade of recycled water tanks according to the water quality evaluation results, and supply water to different water-using ends of the waste transfer station through the recycled water tanks of different grades.

[0012] The electrical control and linkage module is electrically connected to the magnetically controlled variable stiffness filter press assembly, and is signal-connected to the MBR unit, ultrafiltration unit, nanofiltration unit, advanced oxidation unit and graded water distribution assembly to realize various linkage controls of the system;

[0013] The magnetically controlled variable stiffness filter press assembly has two operating conditions. In the first operating condition, the assembly is in a low stiffness state to facilitate the rebound of the grid bars and achieve solid desorption and slag discharge. In the second operating condition, the assembly is in a high stiffness state to maintain the stability of the grid gap and enhance the interception capacity during solid-liquid separation, thereby realizing the simultaneous operation of waste compression and solid-liquid separation and reducing the load on the downstream processing.

[0014] Furthermore, two magnetically controlled variable stiffness filter press assemblies are provided. One is located at the top of the liquid collection and solid-liquid separation module and connected to the outlet end of the leachate collection plate assembly. The other is located at the bottom of the liquid collection and solid-liquid separation module. A lateral slag discharge trough is provided on the side of the magnetically controlled variable stiffness filter press assembly connected to the outlet end of the leachate collection plate assembly. The lateral slag discharge trough is equipped with a conveyor belt, which connects to the bottom of the magnetically controlled variable stiffness filter press assembly. The lateral slag discharge trough is used to send the intercepted solids from the bottom of the magnetically controlled variable stiffness filter press assembly into the slag storage box.

[0015] The bottom of the magnetically controlled variable stiffness filter press assembly located at the bottom of the liquid collection and solid-liquid separation module is connected to the slag storage box in a switchable manner. When the magnetically controlled variable stiffness filter press assembly is in the first working condition, the two are connected.

[0016] A controllable baffle is provided between the two magnetically controlled variable stiffness filter press assemblies. The controllable baffle includes a main baffle and a secondary baffle. The main baffle is used to prevent leachate from entering the bottom magnetically controlled variable stiffness filter press assembly from the top magnetically controlled variable stiffness filter press assembly. The secondary baffle is used to prevent the lateral slag discharge trough from sending the intercepted solids into the slag storage box. The controllable baffle is opened and closed according to the working mode of the liquid collection and solid-liquid separation module.

[0017] Furthermore, the magnetically controlled variable stiffness filter press assembly includes a grid frame, a pull-out grid box, and multiple parallel variable stiffness grid bars disposed within the pull-out grid box, as well as filter press gaps formed between adjacent variable stiffness grid bars; a quick-release locking structure is provided between the pull-out grid box and the grid frame, and the quick-release locking structure is used to replace the pull-out grid box.

[0018] Furthermore, the variable stiffness grid bar is a magnetically controlled elastic grid bar, comprising an elastic matrix and magnetically conductive particles dispersed within the elastic matrix. The magnetically conductive particles are any one or a combination of iron powder, carbonyl iron powder, and ferrite particles. The cross-section of the grid bar along the liquid flow direction is one of a rectangle, a trapezoid, or an inverted T-shape.

[0019] Furthermore, the magnetically controlled variable stiffness filter press assembly also includes an electromagnetic excitation assembly, which includes at least one set of electromagnetic coils and a magnetically conductive yoke that cooperates with the electromagnetic coils to form a closed magnetic circuit. The electromagnetic coils are disposed in the dry chamber, which is not in direct contact with the leachate. The dry chamber and the wet chamber are isolated by a magnetic flux window. The magnetic flux window is a thin-walled magnetically conductive and corrosion-resistant component or a magnetically conductive component covered with a corrosion-resistant coating. The magnetic flux window is used to allow the magnetic field generated by the electromagnetic coils in the dry chamber to pass through the magnetic flux window and act on the grid bars in the wet chamber, thereby achieving dry-wet isolation, corrosion prevention, and stable magnetic control.

[0020] Furthermore, the electronic control and linkage module switches between the first and second operating conditions by controlling the energizing current of the electromagnetic coil: in the first operating condition, the electromagnetic coil is de-energized or in a low-current state, so that the grid bars maintain low stiffness and generate elastic flexing under the action of liquid flushing or compression pulsation; in the second operating condition, the electromagnetic coil is in a high-current state, so that the stiffness of the grid bars is increased and flexing is suppressed, so as to maintain the stability of the filter press gap and improve the solid-liquid separation interception capability.

[0021] Furthermore, the liquid collection and solid-liquid separation module also includes a vibration detection element disposed on the grid frame; the electronic control and linkage module controls the electromagnetic coil to switch between a low-stiffness desorption state and a high-stiffness interception state based on the vibration characteristic signal output by the vibration detection element.

[0022] Furthermore, the leachate collection plate assembly includes an inclined guide plate, a backsplash prevention baffle, and a liquid outlet. The guide plate is used to collect leachate, and the backsplash prevention baffle is used to prevent leachate from splashing back.

[0023] The deep processing integrated skid-mounted module includes a base, vibration damping support components, and a standardized interface group for quick connection. The standardized interface group includes a water inlet interface, a recycled water discharge interface, a sewage discharge interface, a return flow interface, and a CIP interface to achieve modular quick installation and maintenance.

[0024] Furthermore, the system's workflow includes the following steps:

[0025] S1, the leachate collection plate assembly collects the solid-liquid mixture produced at the waste compression station and transports it to the magnetically controlled variable stiffness filter press assembly.

[0026] S2, the magnetically controlled variable stiffness filter press assembly adjusts its working state in real time according to the actual situation and separates the solid-liquid mixture;

[0027] S3, the pretreatment module pretreats the filtered leachate and then transports the leachate to the deep treatment integrated skid-mounted module.

[0028] S4, the deep processing integrated skid-mounted module purifies the leachate to obtain recycled water;

[0029] The S5 tiered water supply module analyzes the water quality of the recycled water. Based on the analysis results, it either delivers the recycled water to the corresponding grade of recycled water tank or returns it to the advanced treatment integrated skid-mounted module for further treatment.

[0030] The beneficial effects achieved by this invention are as follows: 1. By setting up a magnetically controlled variable stiffness filter press assembly, a low-stiffness desorption mechanism is triggered by a vibration threshold. When the vibration increases due to the attachment, it can switch to a low-stiffness state to remove the attachment. After the vibration decreases, it can switch to a high-stiffness interception to ensure screening capacity. The current control logic of the two working conditions ensures that the gap is stable when interception is needed and can be flexed and rebounded when desorption is needed. At the same time, the dry and wet isolation of the coil + magnetic flux window structure prevents the electromagnetic components from directly contacting the leachate, improving corrosion resistance and stability, and facilitating long-term operation.

[0031] 2. The advanced treatment skid-mounted module integrates MBR, ultrafiltration, nanofiltration, and advanced oxidation to form a multi-stage purification chain, providing a water quality foundation for reuse. The tiered water supply module is equipped with a water quality analysis unit and a return component. When the water quality is substandard, it is returned to the advanced treatment skid-mounted module for further treatment. If the water quality is up to standard, it is distributed to different levels of reuse water tanks and supplied to different water users, allowing different water users to take water as needed, improving reuse efficiency and water adaptability. Attached Figure Description

[0032] The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but rather the emphasis is on illustrating the principles of the embodiments. In different views, the same reference numerals designate the same parts.

[0033] Figure 1 This is a structural block diagram of the present invention.

[0034] Figure 2 This is a flowchart of the process of the present invention.

[0035] Figure 3 This is a schematic diagram of the overall structure of the present invention.

[0036] Figure 4 This is a schematic diagram of the structure of the magnetically controlled variable stiffness filter press assembly of the present invention.

[0037] Figure 5 This is a comparison chart showing the effects of the present invention and existing technologies in solid-liquid separation.

[0038] Figure 6 This is a comparison chart showing the effectiveness of the present invention and existing technologies in determining the graded water supply capacity.

[0039] Figure descriptions: 1. Inclined guide plate; 2. Anti-splash baffle; 3. Liquid outlet; 4. Magnetically controlled variable stiffness filter press assembly; 5. Side slag discharge trough; 6. Main baffle; 7. Secondary baffle; 8. Slag storage box; 41. Grid frame; 42. Pull-out grid box; 43. Grid strip; 44. Electromagnetic excitation assembly; 45. Vibration detection component. Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention. Furthermore, the accompanying drawings of the present invention are for simple illustrative purposes only and are not depictions of actual dimensions; this is stated beforehand. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention.

[0041] Example 1: This example provides an integrated system for the deep treatment and reuse of leachate from a waste transfer station, including a liquid collection and solid-liquid separation module, a pretreatment module, a skid-mounted integrated deep treatment module, a tiered water supply module, and an electrical control and linkage module; wherein:

[0042] The liquid collection and solid-liquid separation module is located below the waste compression station and includes a leachate collection plate assembly and a magnetically controlled variable stiffness filter press assembly connected to the liquid outlet end of the leachate collection plate assembly.

[0043] The pretreatment module includes a regulating tank connected to the liquid outlet end of the magnetically controlled variable stiffness filter press assembly, and a pretreatment unit disposed at the water outlet end of the regulating tank. The pretreatment unit includes at least one of a filter screen, a sedimentation structure, or an air flotation structure.

[0044] The deep treatment integrated skid-mounted module is configured as an integrated skid-mounted frame structure, in which an MBR unit, an ultrafiltration unit, a nanofiltration unit, and an advanced oxidation unit are sequentially integrated along the water flow direction.

[0045] The graded water supply module includes a water quality analysis unit, a return component, a graded water storage component, and a graded water distribution component. The water quality analysis unit is used to analyze the water quality of the recycled water. The return component is used to return the recycled water to the deep treatment integrated skid-mounted module for further treatment when the water quality analysis fails. The graded water storage component includes at least two grades of recycled water tanks. The graded water distribution component is used to automatically allocate the recycled water to the corresponding grade of recycled water tanks according to the water quality evaluation results, and supply water to different water-using ends of the waste transfer station through the recycled water tanks of different grades.

[0046] The electrical control and linkage module is electrically connected to the magnetically controlled variable stiffness filter press assembly, and is signal-connected to the MBR unit, ultrafiltration unit, nanofiltration unit, advanced oxidation unit and graded water distribution assembly to realize various linkage controls of the system;

[0047] The magnetically controlled variable stiffness filter press assembly has two operating conditions. In the first operating condition, the assembly is in a low stiffness state to facilitate the rebound of the grid bars and achieve solid desorption and slag discharge. In the second operating condition, the assembly is in a high stiffness state to maintain the stability of the grid gap and enhance the interception capacity during solid-liquid separation, thereby realizing the simultaneous operation of waste compression and solid-liquid separation and reducing the load on the downstream processing.

[0048] Furthermore, two magnetically controlled variable stiffness filter press assemblies are provided. One is located at the top of the liquid collection and solid-liquid separation module and connected to the outlet end of the leachate collection plate assembly. The other is located at the bottom of the liquid collection and solid-liquid separation module. A lateral slag discharge trough is provided on the side of the magnetically controlled variable stiffness filter press assembly connected to the outlet end of the leachate collection plate assembly. The lateral slag discharge trough is equipped with a conveyor belt, which connects to the bottom of the magnetically controlled variable stiffness filter press assembly. The lateral slag discharge trough is used to send the intercepted solids from the bottom of the magnetically controlled variable stiffness filter press assembly into the slag storage box.

[0049] The bottom of the magnetically controlled variable stiffness filter press assembly located at the bottom of the liquid collection and solid-liquid separation module is connected to the slag storage box in a switchable manner. When the magnetically controlled variable stiffness filter press assembly is in the first working condition, the two are connected.

[0050] A controllable baffle is provided between the two magnetically controlled variable stiffness filter press assemblies. The controllable baffle includes a main baffle and a secondary baffle. The main baffle is used to prevent leachate from entering the bottom magnetically controlled variable stiffness filter press assembly from the top magnetically controlled variable stiffness filter press assembly. The secondary baffle is used to prevent the lateral slag discharge trough from sending the intercepted solids into the slag storage box. The controllable baffle is opened and closed according to the working mode of the liquid collection and solid-liquid separation module.

[0051] For example, the following is a description of the operation of the controllable baffle in different working modes. The working modes include normal working mode and high-efficiency working mode. The working mode is set by the system according to the weight of the garbage detected by the garbage compression station. When the weight is greater than the set garbage weight threshold, it is set to high-efficiency working mode, and otherwise, it is set to normal working mode.

[0052] In normal working mode, the main baffle is closed and the secondary baffle is open. The connection between the top magnetically controlled variable stiffness filter press assembly and the main baffle is closed. The leachate passing through the top magnetically controlled variable stiffness filter press assembly flows directly to the pretreatment module. The filtered solids are sent into the slag storage box through the side slag discharge trough. A total of one filtration is performed.

[0053] In high-efficiency operating mode, the main baffle is open and the secondary baffle is closed. The connection between the top magnetically controlled variable stiffness filter press assembly and the main baffle is open. The leachate passing through the top magnetically controlled variable stiffness filter press assembly flows directly to the bottom magnetically controlled variable stiffness filter press assembly. The solids filtered by the top magnetically controlled variable stiffness filter press assembly are temporarily stored in the side slag discharge trough. The secondary baffle collects the dripping water from the solids temporarily stored in the side slag discharge trough. The dripping water flows into the bottom magnetically controlled variable stiffness filter press assembly. The leachate passing through the bottom magnetically controlled variable stiffness filter press assembly flows to the pretreatment module. The solids filtered by the bottom magnetically controlled variable stiffness filter press assembly are sent to the slag storage box at the bottom of the bottom magnetically controlled variable stiffness filter press assembly.

[0054] Furthermore, the magnetically controlled variable stiffness filter press assembly includes a grid frame, a pull-out grid box, and multiple parallel variable stiffness grid bars disposed within the pull-out grid box, as well as filter press gaps formed between adjacent variable stiffness grid bars; a quick-release locking structure is provided between the pull-out grid box and the grid frame, and the quick-release locking structure is used to replace the pull-out grid box.

[0055] Furthermore, the variable stiffness grid bar is a magnetically controlled elastic grid bar, comprising an elastic matrix and magnetically conductive particles dispersed within the elastic matrix. The magnetically conductive particles are any one or a combination of iron powder, carbonyl iron powder, and ferrite particles. The cross-section of the grid bar along the liquid flow direction is one of a rectangle, a trapezoid, or an inverted T-shape.

[0056] Furthermore, the magnetically controlled variable stiffness filter press assembly also includes an electromagnetic excitation assembly, which includes at least one set of electromagnetic coils and a magnetically conductive yoke that cooperates with the electromagnetic coils to form a closed magnetic circuit. The electromagnetic coils are disposed in the dry chamber, which is not in direct contact with the leachate. The dry chamber and the wet chamber are isolated by a magnetic flux window. The magnetic flux window is a thin-walled magnetically conductive and corrosion-resistant component or a magnetically conductive component covered with a corrosion-resistant coating. The magnetic flux window is used to allow the magnetic field generated by the electromagnetic coils in the dry chamber to pass through the magnetic flux window and act on the grid bars in the wet chamber, thereby achieving dry-wet isolation, corrosion prevention, and stable magnetic control.

[0057] Furthermore, the electronic control and linkage module switches between the first and second operating conditions by controlling the energizing current of the electromagnetic coil: in the first operating condition, the electromagnetic coil is de-energized or in a low-current state, so that the grid bars maintain low stiffness and generate elastic flexing under the action of liquid flushing or compression pulsation; in the second operating condition, the electromagnetic coil is in a high-current state, so that the stiffness of the grid bars is increased and flexing is suppressed, so as to maintain the stability of the filter press gap and improve the solid-liquid separation interception capability.

[0058] Furthermore, the liquid collection and solid-liquid separation module also includes a vibration detection element disposed on the grid frame; the electronic control and linkage module controls the electromagnetic coil to switch between a low-stiffness desorption state and a high-stiffness interception state based on the vibration characteristic signal output by the vibration detection element.

[0059] Specifically, when the detected vibration exceeds the set vibration threshold, the system switches to a low-stiffness desorption state to repel the attached material; conversely, it switches to a high-stiffness interception state to improve the solid interception effect.

[0060] Furthermore, the leachate collection plate assembly includes an inclined guide plate, a backsplash prevention baffle, and a liquid outlet. The guide plate is used to collect leachate, and the backsplash prevention baffle is used to prevent leachate from splashing back.

[0061] The deep processing integrated skid-mounted module includes a base, vibration damping support components, and a standardized interface group for quick connection. The standardized interface group includes a water inlet interface, a recycled water discharge interface, a sewage discharge interface, a return flow interface, and a CIP interface to achieve modular quick installation and maintenance.

[0062] Specifically, the MBR unit includes a biological reaction tank, a membrane module, an aeration module, and a suction pump. The biological reaction tank is used to degrade organic matter, the membrane module is used to separate the degraded activated sludge from the water, the aeration module is used to supply oxygen to the biological reaction tank and to perform air-water scrubbing on the surface of the membrane module, and the suction pump is used to extract effluent from the membrane module.

[0063] The ultrafiltration unit includes an ultrafiltration membrane housing and an ultrafiltration membrane element. The ultrafiltration membrane housing is used to support and seal the membrane element to form a pressure filtration channel. The ultrafiltration membrane element is used to retain colloids, microorganisms and macromolecular organic matter.

[0064] The nanofiltration unit includes a high-pressure pump, a pressure vessel, and a nanofiltration membrane element. The high-pressure pump is used to provide the required transmembrane driving force, the pressure vessel is used to mount and seal the membrane element, and the nanofiltration membrane element is used to remove dissolved organic matter.

[0065] The advanced oxidation unit includes an oxidation reactor, an oxidant dosing device, a static mixer, and an ultraviolet (UV) component. The oxidation reactor provides reaction residence time and mixing space to ensure the strong oxidation reaction proceeds fully. The oxidant dosing device is used to precisely add the oxidant. The static mixer is used to quickly and uniformly mix the oxidant with the water. The UV component is used to enhance the UV-based advanced oxidation capability.

[0066] Furthermore, the system's workflow includes the following steps:

[0067] S1, the leachate collection plate assembly collects the solid-liquid mixture produced at the waste compression station and transports it to the magnetically controlled variable stiffness filter press assembly.

[0068] S2, the magnetically controlled variable stiffness filter press assembly adjusts its working state in real time according to the actual situation and separates the solid-liquid mixture;

[0069] S3, the pretreatment module pretreats the filtered leachate and then transports the leachate to the deep treatment integrated skid-mounted module.

[0070] S4, the deep processing integrated skid-mounted module purifies the leachate to obtain recycled water;

[0071] The S5 tiered water supply module analyzes the water quality of the recycled water. Based on the analysis results, it either delivers the recycled water to the corresponding grade of recycled water tank or returns it to the advanced treatment integrated skid-mounted module for further treatment.

[0072] The beneficial effects of this solution are as follows: 1. By setting up a magnetically controlled variable stiffness filter press assembly, a low-stiffness desorption mechanism is triggered by a vibration threshold. When the vibration increases due to the attachment, it can switch to a low-stiffness state to remove the attachment. After the vibration decreases, it can switch to a high-stiffness interception to ensure screening capacity. The current control logic of the two working conditions ensures that the gap is stable when interception is needed and can bend and rebound when desorption is needed. At the same time, the dry and wet isolation of the coil + the magnetic flux window structure prevents the electromagnetic components from directly contacting the leachate, improving corrosion resistance and stability, and facilitating long-term operation.

[0073] 2. The advanced treatment skid-mounted module integrates MBR, ultrafiltration, nanofiltration, and advanced oxidation to form a multi-stage purification chain, providing a water quality foundation for reuse. The tiered water supply module is equipped with a water quality analysis unit and a return component. When the water quality is substandard, it is returned to the advanced treatment skid-mounted module for further treatment. If the water quality is up to standard, it is distributed to different levels of reuse water tanks and supplied to different water users, allowing different water users to take water as needed, improving reuse efficiency and water adaptability.

[0074] Example 2: This example should be understood to include all the features of any of the foregoing examples, and this example is a specific application and deepening of the internal processing logic of the graded water supply module described in Example 1. In Example 1, the graded water supply module includes a water quality analysis unit, a graded water distribution component, and a return component. The water quality analysis unit is responsible for analyzing the quality of the recycled water to guide the graded water distribution component to supply water to different grade recycled water tanks, or, when the water quality is substandard, sending it back to the deep treatment integrated skid-mounted module through the return component. To achieve the accurate analysis function of the water quality analysis unit and avoid misjudgment caused by fluctuations in a single parameter, this example provides a recycled water quality evaluation method executed by the water quality analysis unit: this recycled water quality evaluation method evaluates the water quality by calculating the recycled water pollution level index; the higher the index, the greater the degree of pollution.

[0075] Furthermore, this solution also includes a method for adjusting the deep treatment integrated skid-mounted module based on the reclaimed water evaluation results. To implement this method, the electrical control and linkage module also includes a water quality feedback closed-loop control unit. The water quality feedback closed-loop control unit is signal-connected to the water quality analysis unit and the deep treatment integrated skid-mounted module, and is used to adjust each unit of the deep treatment integrated skid-mounted module based on the reclaimed water pollution level index obtained by the water quality analysis unit.

[0076] The deep treatment integrated skid-mounted module also includes a multi-condition adaptive adjustment interface. The multi-condition adaptive adjustment interface is used to control the other units of the deep treatment integrated skid-mounted module according to the control signal generated by the water quality feedback closed-loop control unit. The multi-condition adaptive adjustment interface includes an aeration volume adjustment interface connecting the variable frequency aerator and the MBR unit, an oxidant dosage adjustment interface connecting the precision metering pump and the advanced oxidation unit, and a flux adjustment interface connecting the nanofiltration (or ultrafiltration) unit and the variable frequency high-pressure pump.

[0077] Specifically, the determination of which level of reclaimed water tank to use and whether reclaimed water needs to be recycled can be made by the value of the reclaimed water pollution level index. Different reclaimed water pollution level index thresholds are set for this purpose, and these thresholds are set by those skilled in the art based on the water quality requirements corresponding to different reclaimed water tanks.

[0078] For example, the following is a formula for calculating the pollution level index of reclaimed water:

[0079] ;

[0080] in, I represents the number of water quality evaluation parameters (referring to various parameters used to evaluate water quality, such as turbidity, particle count, and concentration of various organic substances). Let be the average value of the i-th water quality evaluation parameter over the calculation period. This is the threshold for the i-th water quality evaluation parameter (if it exceeds this threshold, it is considered to be a large threshold). , where represents the credibility weight of the i-th water quality evaluation parameter;

[0081] Furthermore, Calculate according to the following formula:

[0082] ;

[0083] ;

[0084] in, Let exp() be the confidence weight of the i-th water quality evaluation parameter, and let exp() be the exponential function. To account for the impact of noise on weights, To mitigate the impact of drift on weights, Let be the noise index for the i-th water quality evaluation parameter, used to characterize the severity of noise in the sensor data. The larger the index, the more severe the noise is considered to be. The drift index for the i-th water quality evaluation parameter is used to characterize the severity of sensor data drift. The larger the index, the more severe the data drift is considered to be. and It can be calibrated by those skilled in the art based on actual needs and historical data;

[0085] Furthermore, Calculate according to the following steps:

[0086] 1. Obtain each water quality assessment parameter A corresponding time series The sampling interval is Δt (set by the sensor performance), the length of the time series is W (e.g., 10 min or 5 min, which can be set by those skilled in the art according to the required quality assessment period), and the number of samples N in the time series is... ;

[0087] 2. Set the length m of the time subsequence (e.g., 1 min or 0.5 min, which can be set by those skilled in the art according to actual needs; one option is one-tenth of W).

[0088] 3. Obtain the value of each subsequence according to the following formula, taking the j-th subsequence as an example:

[0089] ;

[0090] ;

[0091] in, Let m be the sample mean of the j-th subsequence of the i-th water quality evaluation parameter, and m be the subsequence length. Water quality evaluation parameters The corresponding time series, where k represents the k-th element in the series. Let W be the value of the k-th element in the sequence, W be the length of the time series, M be the number of subsequences, and Floor[] be the floor function.

[0092] 4. Calculate the noise index based on the value of each subsequence:

[0093] ;

[0094] in, Let M be the noise index for the i-th water quality evaluation parameter. This noise index is used to compare the differences between different subsequences, which helps to determine the noise impact based on the differences between the subsequences. The larger the difference between the subsequences, the greater the noise impact. M represents the number of subsequences. Let be the sample mean of the j-th subsequence of the i-th water quality evaluation parameter. It is the sample mean of the (j+1)th subsequence of the i-th water quality evaluation parameter.

[0095] Furthermore, Calculate according to the following formula: ;

[0096] in, This is the drift index for the i-th water quality evaluation parameter. This index determines whether the sensor detection is abnormal by comparing the average detection value of the standard liquid with the equipment detection value. Let be the threshold value for the i-th water quality evaluation parameter. The parameter values ​​obtained by the sensor used to acquire the i-th water quality evaluation parameter from the standard liquid are as follows: The actual value of the i-th water quality evaluation parameter of the standard liquid (which can be the average of the detection values ​​of multiple similar sensors or obtained through experiments). Specifically, the standard liquid can be clean water.

[0097] Furthermore, the water quality feedback closed-loop control unit obtains the dynamic coupling adjustment parameters according to the following formula, and the dynamic coupling adjustment parameters are used to generate various control quantities of the multi-condition adaptive adjustment interface based on the water quality evaluation results:

[0098] ;

[0099] in, For dynamic coupling adjustment parameters, ( ) represents the hyperbolic tangent function, used to smooth the adjustment process and prevent equipment oscillation caused by sudden parameter changes. As an indicator of the pollution level of reclaimed water, The threshold values ​​for the pollution level of reclaimed water under ideal conditions;

[0100] Furthermore, the aeration rate adjustment interface adjusts the aeration rate of the MBR unit according to the following formula:

[0101] ;

[0102] Furthermore, the oxidant dosage adjustment interface adjusts the oxidant dosage of the advanced oxidation unit according to the following formula:

[0103] ;

[0104] Furthermore, the flux adjustment interface adjusts the flux of nanofiltration (or ultrafiltration) according to the following formula:

[0105] ;

[0106] in, This is the updated value for the aeration rate of the MBR unit. This is the initial setting for the aeration rate of the MBR unit. This is the aeration rate adjustment weight, used to control the adjustment amount as dynamically coupled with the adjustment parameters. The range of change, This is an updated value for the oxidant dosage in the advanced oxidation unit. This is the initial value for the oxidant dosage in the advanced oxidation unit. Adjust the weighting of the oxidant dosage. This is the updated value for the flux of nanofiltration (or ultrafiltration). This is the initial value for the flux of nanofiltration (or ultrafiltration). For flux adjustment weights;

[0107] Specifically, nanofiltration (or ultrafiltration) uses the same adjustment method;

[0108] Specifically, the adjustment weights for each item are adjusted by those skilled in the art according to actual needs. The following is a feasible adjustment method:

[0109] Regarding the oxidant dosage adjustment weight, when GSCORE increases (primarily indicating excessive organic matter), the system needs to rapidly and forcefully increase its oxidation capacity to "rush" the removal of pollutants. Furthermore, the cost of oxidant dosage is relatively controllable, and to ensure effluent meets standards, an exponentially large increase in dosage is permissible. It can be set to 1.5, assuming the current water quality is poor. If it is 1.2, then Although the water quality deviated by only 20%, the oxidant dosage increased by 31%. This "advanced adjustment" can quickly lower GSCORE;

[0110] Regarding the adjustment of aeration rate, MBR (Membrane Bioreactor) primarily relies on microorganisms to degrade organic matter. Microorganisms need time to adapt to environmental changes; drastically increasing the aeration rate will not immediately improve treatment efficiency but may instead disperse sludge flocs, break up the biofilm, and even damage the membrane fibers. Therefore, the adjustment of aeration rate should be gradual and linear. It can be set to 0.7 (between 0.5 and 1), assuming the current water quality is poor. If it is 1.2, then With a water quality deviation of 20%, the aeration rate increased by only 13%. This gentle adjustment both aided the biochemical reaction and protected the sludge activity and membrane modules.

[0111] Regarding flux adjustment weights, membrane systems are highly sensitive to influent water quality. When GSCORE increases, it indicates a higher influent fouling load, which can easily lead to membrane pore blockage and irreversible fouling. In this case, it is crucial to decisively reduce the operating flux to extend the hydraulic retention time and alleviate the membrane load. The flux adjustment in the formula involves division; to achieve rapid load reduction, a relatively large weighting index is required. It can be set to 2, assuming the current water quality is poor. If it is 1.2, then The water quality deviated by 20%, but the system flux automatically decreased to 69%. Although this significant reduction temporarily decreased the water production, it effectively prevented membrane fouling outbreaks under high fouling loads, avoiding expensive chemical cleaning or membrane replacement.

[0112] The beneficial effects of this embodiment are as follows: 1. The pollution level is comprehensively characterized by calculating the reclaimed water pollution level index. The higher the index, the more severe the pollution. Different thresholds can be used to directly drive the control logic of "selecting the corresponding level of reclaimed water tank / whether to recycle and reprocess", which significantly reduces manual interpretation and conflicts between multiple rules. 2. A confidence weight is introduced into the index, so that the same set of evaluation formulas can automatically reduce the data contribution of sensors with high noise or large drift, thereby avoiding misclassification and false recycle caused by a single sensor malfunction. 3. The noise index measures the severity of noise by segmenting the periodic sequence and calculating the difference in mean between adjacent subsequences, which can effectively distinguish between "short-term fluctuations" and "continuous exceedances", thereby reducing unnecessary recycle and frequent grading switching caused by instantaneous disturbances. 4. The multi-condition parameter adaptive adjustment interface directly acts on each unit (MBR, advanced oxidation, etc.) in the skid-mounted module, making the originally fixed equipment parameters into dynamic parameters that can be adjusted according to water quality, improving the flexibility of the equipment and the reclaimed water treatment capacity.

[0113] Example 3: This example should be understood as including all the features of any of the foregoing examples, and further improving upon them. Furthermore, this example provides a more detailed description of each part of the system and gives specific implementation equipment, as shown below:

[0114] The leachate collection plate assembly adopts a structure of "inclined guide plate + anti-splash baffle + liquid outlet": the inclined guide plate is made of 304 or 316L stainless steel plate (thickness 2.0–3.0 mm), and the plate surface slope is 8°–15°; the anti-splash baffle is 50–120 mm high and has a rounded edge to reduce back splashing of flushing water; the effective collection area of ​​the collection plate is covered according to the width of the feeding surface of the waste compression station (e.g., 1.2 m × 1.6 m).

[0115] The magnetically controlled variable stiffness filter press assembly comprises: a stainless steel welded frame (e.g., 800mm × 500mm × 250mm), with an internal pull-out filter box and quick-release locking structure; parallel arrangement of filter bars to form filter gaps (e.g., gap 1.0–2.5 mm); the filter bars can be made of polyurethane or silicone rubber elastic matrix and dispersed with carbonyl iron powder / iron powder / ferrite magnetic particles (volume fraction 20%–40%) to achieve magnetic stiffness adjustment; the cross-section of the filter bars can be rectangular / trapezoidal / inverted T-shaped to match different clogging tendencies; the electromagnetic coil is arranged in the dry chamber, which is not in contact with the leachate, and is isolated from the wet chamber through a magnetic flux window; the coil current control is used for switching between two operating conditions (e.g., low stiffness 0–0.3 A, high stiffness 1.0–2.5 A, specifically based on on-site interception pressure difference and vibration response calibration); the vibration detection device can be an industrial piezoelectric accelerometer or a MEMS vibration sensor (e.g., range ±16 g, sampling frequency 200–1000 Hz). When the vibration characteristic exceeds the threshold (Hz), it switches to low stiffness desorption to bounce off the attached object. After the vibration returns, it switches to high stiffness interception to stabilize the gap and improve the interception capability.

[0116] If a screen filter is selected for the pretreatment module, a wedge screen or basket filter can be used. If a sedimentation structure is selected, inclined plate sedimentation (inclination plate spacing 20–40 mm) can be configured. If an air flotation structure is selected, dissolved air flotation (reflux ratio 10%–30%) can be configured.

[0117] The advanced treatment integrated skid-mounted module includes: an MBR unit that can use PVDF hollow fiber membranes (pore size approximately 0.1 µm, membrane flux 8–15 LMH, aeration rate 0.3–0.8 Nm³ / (m²·h)) and an MLSS of 6000–10000 mg / L; an ultrafiltration unit that can use PVDF / PS hollow fiber or spiral wound UF (pore size 0.02–0.05 µm); a nanofiltration unit that can use spiral wound membranes with a MWCO of approximately 200–400 Da and is equipped with a high-pressure pump; and an advanced oxidation unit that can use common AOP implementation methods such as UV / H2O2 or ozone catalytic oxidation.

[0118] The following table compares the effectiveness of this solution and existing technologies in solid-liquid separation. Figure 5 The corresponding effect diagram (data takes the upper limit of the range):

[0119]

[0120] The following table compares the effectiveness of this solution and existing technologies in determining the tiered water supply capacity. Figure 5 The corresponding effect diagram (data takes the upper limit of the range):

[0121]

[0122] Based on the table above, we can see that: Over a 30-day period, the number of shutdowns for cleaning blockages using this solution decreased from 8-12 times in existing technologies to 1-3 times, and the cumulative downtime decreased from 6-10 hours to 0.5-2 hours, resulting in a 60%-85% reduction in maintenance time. Simultaneously, the peak pressure difference before and after the screen decreased from approximately 45 kPa to around 15 kPa, indicating more stable front-end interception and lower blockage risk, thus improving overall availability and operational stability. Over the same 30-day period, the number of erroneous backflows decreased from 11 to 2 (approximately an 80% reduction), the backflow volume percentage decreased from 10%-18% to 2%-5%, and the proportion of water entering the primary tank increased from 60%-75% to 80%-90%. Furthermore, the water supply switching frequency decreased from 10-25 times / day to 3-8 times / day, indicating more stable tiered decision-making, fewer valve actions, and lower erroneous actions. The comprehensive power consumption per unit of produced water decreased from 4.1 kWh / m³ to 3.6 kWh / m³, based on a 30-day, 720 Based on m³, the total power consumption is reduced by approximately 360 kWh (approximately 12%). Due to the reduction in ineffective backflow, the consumption of oxidant / chemicals also decreases with the amount of backflow treated, resulting in lower overall operating costs. Compared with existing technologies, this solution achieves comprehensive benefits such as "fewer downtimes, fewer erroneous backflows, lower energy consumption, and more stable tiered water supply" through two key differences: a front-end self-cleaning anti-clogging mechanism and a graded evaluation with credibility weights.

[0123] The above-disclosed content is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Therefore, all equivalent technical changes made based on the description and drawings of the present invention are included within the scope of protection of the present invention. Furthermore, the elements therein can be updated as technology develops. The above units are merely examples, and those skilled in the art can adopt corresponding units according to actual needs when implementing this solution.

Claims

1. An integrated system for deep treatment and reuse of leachate from a waste transfer station, characterized in that, It includes a liquid collection and solid-liquid separation module, a pretreatment module, a deep treatment integrated skid-mounted module, a graded water supply module, and an electrical control and linkage module; among which: The liquid collection and solid-liquid separation module is located below the waste compression station and includes a leachate collection plate assembly and a magnetically controlled variable stiffness filter press assembly connected to the liquid outlet end of the leachate collection plate assembly. The pretreatment module includes a regulating tank connected to the liquid outlet end of the magnetically controlled variable stiffness filter press assembly, and a pretreatment unit disposed at the water outlet end of the regulating tank. The pretreatment unit includes at least one of a filter screen, a sedimentation structure, or an air flotation structure. The deep treatment integrated skid-mounted module is configured as an integrated skid-mounted frame structure, in which an MBR unit, an ultrafiltration unit, a nanofiltration unit, and an advanced oxidation unit are sequentially integrated along the water flow direction. The graded water supply module includes a water quality analysis unit, a return component, a graded water storage component, and a graded water distribution component. The water quality analysis unit is used to analyze the water quality of the recycled water. The return component is used to return the recycled water to the deep treatment integrated skid-mounted module for further treatment when the water quality analysis fails. The graded water storage component includes at least two grades of recycled water tanks. The graded water distribution component is used to automatically allocate the recycled water to the corresponding grade of recycled water tanks according to the water quality evaluation results, and supply water to different water-using ends of the waste transfer station through the recycled water tanks of different grades. The electrical control and linkage module is electrically connected to the magnetically controlled variable stiffness filter press assembly, and is signal-connected to the MBR unit, ultrafiltration unit, nanofiltration unit, advanced oxidation unit and graded water distribution assembly to realize various linkage controls of the system; The magnetically controlled variable stiffness filter press assembly has two operating conditions. In the first operating condition, the assembly is in a low stiffness state to facilitate the rebound of the grid bars and achieve solid desorption and slag discharge. In the second operating condition, the assembly is in a high stiffness state to maintain the stability of the grid gap and enhance the interception capacity during solid-liquid separation, thereby realizing the simultaneous operation of waste compression and solid-liquid separation and reducing the load on the downstream processing.

2. The integrated system for deep treatment and reuse of leachate from a waste transfer station according to claim 1, characterized in that, Two magnetically controlled variable stiffness filter press assemblies are provided. One is located at the top of the liquid collection and solid-liquid separation module and connected to the outlet end of the leachate collection plate assembly. The other is located at the bottom of the liquid collection and solid-liquid separation module. A lateral slag discharge trough is provided on the side of the magnetically controlled variable stiffness filter press assembly connected to the outlet end of the leachate collection plate assembly. The lateral slag discharge trough is equipped with a conveyor belt, which connects to the bottom of the magnetically controlled variable stiffness filter press assembly. The lateral slag discharge trough is used to send the intercepted solids from the bottom of the magnetically controlled variable stiffness filter press assembly into the slag storage box. The magnetically controlled variable stiffness filter press assembly located at the bottom of the liquid collection and solid-liquid separation module, namely the lower magnetically controlled variable stiffness filter press assembly, has its bottom connected to the slag collection box in a switchable manner. When the magnetically controlled variable stiffness filter press assembly is in the first working condition, the two are connected. A controllable baffle is provided between the two magnetically controlled variable stiffness filter press assemblies. The controllable baffle includes a main baffle and a secondary baffle. The main baffle is used to prevent leachate from entering the bottom magnetically controlled variable stiffness filter press assembly from the top magnetically controlled variable stiffness filter press assembly. The secondary baffle is used to prevent the lateral slag discharge trough from sending the intercepted solids into the slag storage box. The controllable baffle is opened and closed according to the working mode of the liquid collection and solid-liquid separation module.

3. The integrated system for deep treatment and reuse of leachate from a waste transfer station according to claim 1, characterized in that, The magnetically controlled variable stiffness filter press assembly includes a grid frame, a pull-out grid box, and multiple parallel variable stiffness grid bars arranged in the pull-out grid box, as well as filter press gaps formed between adjacent variable stiffness grid bars; a quick-release locking structure is provided between the pull-out grid box and the grid frame, and the quick-release locking structure is used to replace the pull-out grid box.

4. The integrated system for deep treatment and reuse of leachate from a waste transfer station according to claim 1, characterized in that, The variable stiffness grid bar is a magnetically controlled elastic grid bar, comprising an elastic matrix and magnetically conductive particles dispersed within the elastic matrix. The magnetically conductive particles are any one or a combination of iron powder, carbonyl iron powder, and ferrite particles. The cross-section of the grid bar along the liquid flow direction is one of a rectangle, a trapezoid, or an inverted T-shape.

5. The integrated system for deep treatment and reuse of leachate from a waste transfer station according to claim 1, characterized in that, The magnetically controlled variable stiffness filter press assembly also includes an electromagnetic excitation assembly, which includes at least one set of electromagnetic coils and a magnetically conductive yoke that cooperates with the electromagnetic coils to form a closed magnetic circuit. The electromagnetic coils are disposed in the dry chamber, which is not in direct contact with the leachate. The dry chamber and the wet chamber are isolated by a magnetic flux window. The magnetic flux window is a thin-walled magnetically conductive corrosion-resistant component or a magnetically conductive component covered with a corrosion-resistant coating. The magnetic flux window is used to allow the magnetic field generated by the electromagnetic coils in the dry chamber to pass through the magnetic flux window and act on the grid bars in the wet chamber, thereby achieving dry-wet isolation, corrosion prevention, and stable magnetic control.

6. The integrated system for deep treatment and reuse of leachate from a waste transfer station according to claim 1, characterized in that, The electronic control and linkage module switches between the first and second operating conditions by controlling the energizing current of the electromagnetic coil: In the first operating condition, the electromagnetic coil is de-energized or in a low-current state, so that the grid bars maintain low stiffness and produce elastic flexing under the action of liquid flushing or compression pulsation; In the second operating condition, the electromagnetic coil is in a high-current state, so that the stiffness of the grid bars is increased and flexing is suppressed, so as to maintain the stability of the filter press gap and improve the solid-liquid separation interception capability.

7. The integrated system for deep treatment and reuse of leachate from a waste transfer station according to claim 1, characterized in that, The liquid collection and solid-liquid separation module also includes a vibration detection device mounted on the grid frame; the electronic control and linkage module controls the electromagnetic coil to switch between a low-stiffness desorption state and a high-stiffness interception state based on the vibration characteristic signal output by the vibration detection device.

8. The integrated system for deep treatment and reuse of leachate from a waste transfer station according to claim 1, characterized in that, The leachate collection plate assembly includes an inclined guide plate, a backsplash prevention baffle, and a liquid outlet. The guide plate is used to collect leachate, and the backsplash prevention baffle is used to prevent leachate from splashing back. The deep processing integrated skid-mounted module includes a base, vibration damping support components, and a standardized interface group for quick connection. The standardized interface group includes a water inlet interface, a recycled water discharge interface, a sewage discharge interface, a return flow interface, and a CIP interface to achieve modular quick installation and maintenance.

9. The integrated system for deep treatment and reuse of leachate from a waste transfer station according to claim 1, characterized in that, The system's workflow includes the following steps: S1, the leachate collection plate assembly collects the solid-liquid mixture produced at the waste compression station and transports it to the magnetically controlled variable stiffness filter press assembly. S2, the magnetically controlled variable stiffness filter press assembly adjusts its working state in real time according to the actual situation and separates the solid-liquid mixture; S3, the pretreatment module pretreats the filtered leachate and then transports the leachate to the deep treatment integrated skid-mounted module. S4, the deep processing integrated skid-mounted module purifies the leachate to obtain recycled water; S5, the graded water supply module analyzes the water quality of the recycled water and, based on the analysis results, delivers the recycled water to the corresponding grade of recycled water tank or returns the recycled water to the deep treatment integrated skid-mounted module for further treatment.

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