A wastewater resource system and method

Abstract

The application discloses a wastewater resource system and method, and particularly relates to the field of wastewater treatment, which comprises online detection of wastewater entering a treatment system, acquisition of water inlet parameters representing organic matter concentration, salinity and nitrogen and phosphorus content, and determination of a resource treatment priority direction of the current wastewater based on the water inlet parameters; and selection of one of a preset anaerobic resource treatment path, an electrochemical resource treatment path and a nutrient salt recovery treatment path as a main treatment path of a current operation cycle according to the water inlet parameters. By taking an operation cycle as a basic scheduling unit, single-path selection, mutual exclusion execution and cross-cycle rotation control of different resource treatment paths based on water inlet conditions and historical operation results are implemented, so that the competition relationship of multiple resource mechanisms is constrained in the time and energy scales, internal consumption of the system is reduced, and stable recovery of wastewater resources is realized.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a wastewater resource recovery system and method. Background Technology

[0002] In the existing wastewater resource utilization technology system, in order to pursue the efficiency of multiple resource recovery per unit volume of water, engineering practice generally adopts methods such as reflux enhancement, parallel connection of multiple reaction units, multi-stage treatment and energy coupling operation, so that anaerobic gas production, electrochemical power generation and nutrient recovery can be carried out simultaneously in the same system.

[0003] Under short-term operation or single-index evaluation conditions, such systems often exhibit high local processing efficiency or single-resource recovery levels. However, during long-term continuous operation, different resource recovery pathways have fundamentally different requirements for organic substrates, ionic environment, reaction interface and energy gradient, which gradually form an inherent relationship of mutual constraint and consumption. For example, reflux enhancement is beneficial to gas yield but dilutes the driving force of electrochemical reaction. Maintaining electrochemical conditions changes the chemical balance required for mineralization and crystallization. As a result, although each processing unit maintains its own "high efficiency range", the system as a whole continues to suffer from hidden consumption such as ineffective circulation, energy loss and resource diversion.

[0004] Against this backdrop, current technologies struggle to accurately identify and avoid system-level internal friction caused by the simultaneous operation of multiple paths, ultimately revealing a core contradiction: existing wastewater resource recovery methods lack systematic constraints on the competitive relationships between multiple resource recovery mechanisms on time and energy scales, resulting in a continuous decline in overall net resource benefits as operating time increases. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a wastewater resource recovery system and method. By using the operating cycle as the basic scheduling unit, single-path selection, mutually exclusive execution, and cross-cycle rotation control are implemented for different resource recovery treatment paths based on influent conditions and historical operating results. This constrains the competitive relationship of multiple resource recovery mechanisms on both time and energy scales, reduces system-level internal friction, and achieves stable wastewater resource recovery, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wastewater resource recovery method, comprising:

[0007] S1. Perform online detection on the wastewater entering the treatment system to obtain influent parameters characterizing organic matter concentration, salinity, and nitrogen and phosphorus content, and determine the priority direction for resource utilization treatment of the current wastewater based on the influent parameters.

[0008] S2. Based on the influent parameters, select one of the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path as the main treatment path for the current operating cycle.

[0009] S3. During the operating cycle, wastewater is only supplied to the main treatment path, and control operations are implemented to suspend water intake or maintain standby for other treatment paths that are not selected, so as to avoid multiple treatment paths acting on the same wastewater at the same time.

[0010] S4. After the operation cycle ends, the influent parameters and treatment process parameters are collected again, and S2 is executed again based on the updated parameters to determine the main treatment path for the next operation cycle.

[0011] S5. By alternately executing S3 on each processing path in different operating cycles, the resource dispersion and energy loss caused by multi-path parallelism during the processing are reduced, thereby realizing the recycling of wastewater resources.

[0012] In a preferred embodiment, S1 includes:

[0013] S1-1. Perform online monitoring of the wastewater entering the treatment system to obtain parameters such as organic matter concentration, salinity, nitrogen content, and phosphorus content.

[0014] S1-2. Compare the organic matter concentration parameter and salinity parameter with the preset threshold set item by item. When condition one is met: the organic matter concentration parameter is not less than the organic matter threshold and the salinity parameter is not greater than the salinity threshold, determine the priority direction of resource utilization treatment as anaerobic resource utilization treatment.

[0015] When condition one is not met but condition two is met: the organic matter concentration parameter is not less than another preset organic matter threshold and the salinity parameter is not greater than another preset salinity threshold, the priority direction for resource recovery treatment is determined to be the electrochemical resource recovery treatment direction.

[0016] When the nitrogen content parameter and the phosphorus content parameter meet condition three: the nitrogen-phosphorus ratio is within the preset nitrogen-phosphorus ratio range, the priority direction for resource recovery treatment is determined to be the nutrient salt recovery treatment direction.

[0017] S1-3, Output the determined priority direction for resource processing.

[0018] In a preferred embodiment, S2 includes:

[0019] S2-1. At the start of the current operating cycle, for the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path and nutrient salt recovery treatment path, determine the corresponding operating parameter group for the treatment path. The operating parameter group includes at least one or more of the following: influent flow rate setting value, temperature setting value, stirring intensity setting value, electrode potential setting value or dosage setting value.

[0020] S2-2. Based on the influent parameters of the current operating cycle, select multiple historical operating cycles in the historical operating records where the influent parameters are in the same value range, and extract the resource recovery results, energy consumption results and effluent detection results of the historical operating cycles under the corresponding processing path.

[0021] S2-3. For each treatment path, based on the selected historical operating cycle, calculate the average value of the resource recovery result, the average value of the energy consumption result, and the proportion of the effluent detection result exceeding the discharge limit corresponding to the treatment path, and use the average value and the proportion of occurrence as the treatment effect calculation result of the treatment path under the current influent conditions.

[0022] S2-4. Compare the treatment effect calculation results of each treatment path, eliminate the treatment path where the proportion of effluent detection results exceeding the discharge limit is higher than the preset upper limit, and select the treatment path where the average value of resource recovery results is higher than the corresponding preset threshold and the average value of energy consumption results is lower than the corresponding preset threshold from the remaining treatment paths, and determine it as the main treatment path for the current operating cycle.

[0023] In a preferred embodiment, S2 further includes:

[0024] The anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path are all based on the existing treatment system. The treatment system includes at least an inlet main pipe, an inlet valve installed on the inlet main pipe, multiple treatment units, an outlet distribution branch, a reflux pump, and a dosing device. The multiple treatment units include an anaerobic reaction unit, an electrochemical reaction unit, and a nutrient recovery unit.

[0025] Each processing path is defined by combining the opening state of the inlet valve, the operating state of the return pump, and the dosing state of the dosing device, and forms different fluid communication relationships with the corresponding processing unit, thus forming a preset combination of operating states that are distinct from each other.

[0026] In the anaerobic resource recovery treatment pathway, the treatment unit is an anaerobic reaction unit. The main inlet pipe is connected to the inlet of the anaerobic reaction unit, the gas production port of the anaerobic reaction unit is connected to the gas production output branch, and the outlet of the anaerobic reaction unit is connected to the effluent distribution branch. One end of the reflux pump is connected to the effluent distribution branch, and the other end is connected to the inlet of the anaerobic reaction unit, for returning a portion of the treated wastewater to the anaerobic reaction unit. The dosing device is connected to the inlet or reaction zone of the anaerobic reaction unit, for adding conditioning agents to the anaerobic reaction unit.

[0027] In the electrochemical resource recovery process, the treatment unit is an electrochemical reaction unit. The main inlet pipe is connected to the inlet of the electrochemical reaction unit, and the outlet of the electrochemical reaction unit is connected to the outlet distribution branch. The treatment system also includes an electrode control device electrically connected to the electrode port of the electrochemical reaction unit for controlling the electrode potential of the electrochemical reaction unit. One end of the reflux pump is connected to the outlet distribution branch or the reflux end of the electrochemical reaction unit, and the other end is connected to the inlet or cathode liquid reflux end of the electrochemical reaction unit to create the reflux conditions required for the electrochemical reaction.

[0028] In the nutrient recovery and treatment path, the treatment unit is a nutrient recovery unit. The main inlet pipe is connected to the nutrient recovery unit, and the nutrient recovery unit is connected to the solid-liquid separation unit. The solid-liquid separation unit is connected to the solid product branch and the filtrate branch, respectively, for outputting solid product and filtrate. The dosing device is connected to the nutrient recovery unit and is used to add a crystallization-promoting agent to the nutrient recovery unit. One end of the reflux pump is connected to the filtrate branch, and the other end is connected to the pretreatment unit or electrochemical reaction unit in the treatment system, for reflux reuse of the filtrate.

[0029] In a preferred embodiment, S3 includes:

[0030] S3-1. During the current operating cycle, the inlet valve is kept open so that wastewater is transported only through the main inlet pipe to the treatment unit corresponding to the main treatment path, and the treatment unit is operated according to the operating parameter group corresponding to the main treatment path.

[0031] S3-2. While the main processing path is being executed, the inlet valves of other processing paths that are not selected as the main processing path are controlled to be closed, or their corresponding processing units are controlled to enter a standby state to prevent wastewater from entering the other processing paths.

[0032] S3-3. During the duration of the operating cycle, the influent mutual exclusion state between the main treatment path and the other treatment paths is maintained, so that the same wastewater only acts on the treatment unit corresponding to the main treatment path, thereby avoiding multiple treatment paths acting on the same wastewater simultaneously in the same operating cycle.

[0033] In a preferred embodiment, S4 includes:

[0034] S4-1. Compare the runtime or processing volume of the current running cycle with the preset end condition. When the end condition is met, determine that the current running cycle has ended.

[0035] The preset end conditions include: the cumulative running time in the current operating cycle reaches a preset fixed running time value, or the cumulative wastewater treated by the main treatment path in the current operating cycle reaches a preset fixed treatment volume value; wherein, the cumulative running time and the cumulative treatment volume are respectively used as direct comparison benchmarks in S4-1 to determine whether the current operating cycle has ended.

[0036] S4-2. After the current operating cycle ends, re-collect the influent parameters entering the treatment system and the corresponding main treatment path processing parameters, and combine the influent parameters and processing parameters into an updated parameter set.

[0037] S4-3. Execute S2 again based on the updated parameter set to determine the main processing path for the next running cycle.

[0038] In a preferred embodiment, S5 includes:

[0039] S5-1. In multiple consecutive running cycles, S3 is executed cycle by cycle according to the main processing path determined for each running cycle.

[0040] At the end of each running cycle, the resource recovery result value and energy consumption result value corresponding to the main processing path are recorded, and the difference between the resource recovery result value and energy consumption result value and the corresponding value of the processing path in the adjacent previous running cycle is calculated. When the difference is not equal to zero, the processing path is registered as a processing path that has participated in the rotation execution.

[0041] S5-2. During any operating cycle, keep the inlet valves of other treatment paths that are not determined as the main treatment path closed or keep their corresponding treatment units in standby mode, so that wastewater only enters the treatment unit corresponding to the main treatment path.

[0042] S5-3. After multiple consecutive operating cycles, the maximum and minimum values ​​of the resource recovery result and energy consumption result values ​​corresponding to each processing path in the multiple operating cycles are calculated respectively, and the difference between the maximum and minimum values ​​is used as the resource recovery fluctuation value and energy consumption fluctuation value of the corresponding processing path.

[0043] When the resource recovery fluctuation value and energy consumption fluctuation value of each processing path do not exceed the preset allowable difference, the current processing path rotation execution order is maintained.

[0044] When the resource recovery fluctuation value or energy consumption fluctuation value of any processing path exceeds the allowable difference, the execution order or execution frequency of that processing path as the main processing path in subsequent operating cycles will be adjusted.

[0045] A wastewater resource recovery system includes an identification module, a path selection module, a mutual exclusion module, an update module, and a stabilization module;

[0046] The identification module is used to perform online detection of wastewater entering the treatment system, obtain influent parameters characterizing organic matter concentration, salinity, and nitrogen and phosphorus content, and determine the priority direction for resource utilization treatment of the current wastewater based on the influent parameters.

[0047] Based on the influent parameters, the path selection module selects one of the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path as the main treatment path for the current operating cycle.

[0048] The mutual exclusion module is used to deliver wastewater only to the main treatment path during the operating cycle, and to implement control operations to suspend water intake or maintain standby for other treatment paths that are not selected, so as to avoid multiple treatment paths acting on the same wastewater at the same time.

[0049] The update module is used to re-collect the influent parameters and treatment process parameters after the operation cycle ends, and execute S2 again based on the updated parameters to determine the main treatment path for the next operation cycle.

[0050] The stabilization module reduces resource dispersion and energy loss caused by multi-path parallelism during the processing by alternately executing S3 on each processing path in different operating cycles, thereby achieving wastewater resource recovery.

[0051] The technical effects and advantages of this invention are as follows:

[0052] This invention divides the wastewater resource recovery process into discrete operating cycles and allows only a single resource recovery path to participate in the operation within any operating cycle. This eliminates the problem of anaerobic gas production, electrochemical power generation, and nutrient recovery competing for substrates, ion environment, and energy gradients on the same time scale from the system operation level. It avoids the hidden internal friction caused by the parallel operation of multiple paths and ensures that the overall net resource benefit no longer continuously decreases with the increase of operating time.

[0053] This invention filters historical operating cycles based on the range of influent parameters and quantitatively compares the resource recovery results, energy consumption results, and effluent compliance of different treatment paths under the same water quality conditions. This ensures that the selection of treatment paths is based on real operating results rather than theoretical assumptions or single-index optimization, thereby improving the reliability and engineering applicability of treatment path decisions under long-term operating conditions.

[0054] This invention introduces a pre-elimination mechanism based on the proportion of effluent exceeding standards during the treatment path selection process. By making effluent compliance a prerequisite constraint for the selection of treatment paths, the determination of the main treatment path not only considers the resource recovery level and energy consumption level, but also controls potential effluent risks simultaneously, thus avoiding the introduction of systemic environmental risks in pursuit of resource efficiency.

[0055] This invention records, calculates differences, and analyzes fluctuations in the execution results of processing paths across multiple operating cycles. Based on this, it restricts the continuous selection of processing paths or adjusts their execution order, enabling the system to suppress performance fluctuations caused by a single path occupying processing resources for a long time in the time dimension, and achieve long-term stable control of resource recovery effect and energy consumption level.

[0056] This invention constructs different resource recovery paths as a combination of preset operating states within the same processing system, rather than adding independent processing structures. This allows the switching of processing paths to rely solely on the combined control of operating states such as valves, reflux, and chemical dosing. Without increasing system complexity, it enables the orderly invocation of multiple resource recovery mechanisms, thereby improving the overall feasibility and maintainability of the system. Attached Figure Description

[0057] Figure 1 This is a flowchart of the method steps of the present invention.

[0058] Figure 2 This is a schematic diagram of the system modules of the present invention. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] Refer to the instruction manual appendix Figure 1-2 An embodiment of the present invention provides a wastewater resource recovery method, comprising:

[0061] S1. Perform online detection on the wastewater entering the treatment system to obtain influent parameters characterizing organic matter concentration, salinity, and nitrogen and phosphorus content, and determine the priority direction for resource utilization treatment of the current wastewater based on the influent parameters.

[0062] S2. Based on the influent parameters, select one of the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path as the main treatment path for the current operating cycle.

[0063] S3. During the operating cycle, wastewater is only supplied to the main treatment path, and control operations are implemented to suspend water intake or maintain standby for other treatment paths that are not selected, so as to avoid multiple treatment paths acting on the same wastewater at the same time.

[0064] S4. After the operation cycle ends, the influent parameters and treatment process parameters are collected again, and S2 is executed again based on the updated parameters to determine the main treatment path for the next operation cycle.

[0065] S5. By alternately executing S3 on each treatment path in different operating cycles, the resource dispersion and energy loss caused by multi-path parallelism during the treatment process are reduced, and stable recovery of wastewater resources is achieved.

[0066] S1 includes:

[0067] S1-1. Perform online monitoring of the wastewater entering the treatment system to obtain parameters such as organic matter concentration, salinity, nitrogen content, and phosphorus content.

[0068] S1-2. Compare the organic matter concentration parameter and salinity parameter with the preset threshold set item by item. When condition one is met: the organic matter concentration parameter is not less than the organic matter threshold and the salinity parameter is not greater than the salinity threshold, determine the priority direction of resource utilization treatment as anaerobic resource utilization treatment.

[0069] When condition one is not met but condition two is met: the organic matter concentration parameter is not less than another preset organic matter threshold and the salinity parameter is not greater than another preset salinity threshold, the priority direction for resource recovery treatment is determined to be the electrochemical resource recovery treatment direction.

[0070] When the nitrogen content parameter and the phosphorus content parameter meet condition three: the nitrogen-phosphorus ratio is within the preset nitrogen-phosphorus ratio range, the priority direction for resource recovery treatment is determined to be the nutrient salt recovery treatment direction.

[0071] S1-3, Output the determined priority direction for resource processing;

[0072] It should be noted that the organic matter threshold and salinity threshold in Condition 1 are determined as follows: the organic matter threshold is the lowest influent organic matter concentration that can maintain continuous gas production without acidification and instability under the designed operating temperature and residence time conditions of the anaerobic reaction unit in the system; the salinity threshold is the highest measured influent salinity value that corresponds to the same anaerobic reaction unit without a significant decrease in gas production rate during long-term operation. The two serve as fixed comparison benchmarks for determining whether wastewater meets the conditions for direct entry into anaerobic resource utilization treatment.

[0073] The organic matter threshold and salinity threshold in Condition 2 are determined as follows: the organic matter threshold is the lowest influent organic matter concentration required by the electrochemical resource recovery unit under stable output current conditions; the salinity threshold is the highest influent salinity that does not cause abnormal electrode polarization or significant reduction in reaction efficiency in the electrochemical treatment unit, which is used to determine whether the wastewater is suitable to enter the electrochemical resource recovery path.

[0074] Furthermore, the organic matter threshold in condition two is lower than that in condition one, and the salinity threshold in condition two is not higher than that in condition one. This is because anaerobic resource recovery is more sensitive to the continuity of organic matter concentration and salinity inhibition. When the influent organic matter concentration is insufficient or the salinity is close to the inhibition range, the anaerobic reaction is prone to acidification or gas production instability. In contrast, electrochemical resource recovery has a lower minimum requirement for organic matter concentration, but it still needs to control the salinity level to avoid aggravated electrode polarization. Therefore, by lowering the organic matter threshold corresponding to electrochemical treatment and not raising the salinity threshold, the system can sequentially switch to the electrochemical treatment path when the influent conditions are no longer suitable for anaerobic treatment. This avoids conflict in treatment direction determination caused by the same influent state simultaneously meeting multiple treatment conditions.

[0075] Additionally, it should be noted in S1-1 that: wastewater entering the treatment system is introduced to a fixed online detection location at the inlet main pipe and diverted to multiple detection channels at the same sampling time to ensure the comparability of detection results; for the organic matter concentration parameter, the obtained chemical oxygen demand (COD) or total organic carbon (TOC) values ​​are used as organic matter concentration parameters reflecting the overall level of oxidizable organic matter in the wastewater by performing online chemical oxygen demand (COD) or online total organic carbon (TOC) measurements on the sampled wastewater; for the salinity parameter, the salinity value is obtained by measuring the conductivity of the same sampled wastewater and converting it according to the correspondence between conductivity and dissolved inorganic salt concentration, or by directly measuring the dissolved... The content of soluble solids is used as a salinity parameter to characterize the total content of inorganic salts in wastewater. For nitrogen content parameters, ammonia nitrogen, nitrate nitrogen, and nitrite nitrogen in the sampled wastewater are measured online, and the concentration values ​​of each nitrogen form are combined and calculated according to a unified unit of measurement to obtain a nitrogen content parameter characterizing the total amount of migrateable nitrogen in the wastewater. For phosphorus content parameters, total phosphorus or orthophosphate is measured in the sampled wastewater, and the measured phosphorus concentration value is used as a phosphorus content parameter to characterize the level of recoverable or controllable phosphorus in the wastewater. All the above parameters are obtained based on the same sampled wastewater and are output in the form of detected values.

[0076] S2 includes:

[0077] S2-1. At the start of the current operating cycle, for the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path and nutrient salt recovery treatment path, determine the corresponding operating parameter group for the treatment path. The operating parameter group includes at least one or more of the following: influent flow rate setting value, temperature setting value, stirring intensity setting value, electrode potential setting value or dosage setting value.

[0078] S2-2. Based on the influent parameters of the current operating cycle, select multiple historical operating cycles in the historical operating records where the influent parameters are in the same value range, and extract the resource recovery results, energy consumption results and effluent detection results of the historical operating cycles under the corresponding processing path.

[0079] S2-3. For each treatment path, based on the selected historical operating cycle, calculate the average value of the resource recovery result, the average value of the energy consumption result, and the proportion of the effluent detection result exceeding the discharge limit corresponding to the treatment path, and use the average value and the proportion of occurrence as the treatment effect calculation result of the treatment path under the current influent conditions.

[0080] S2-4. Compare the treatment effect calculation results of each treatment path, eliminate the treatment path where the proportion of effluent detection results exceeding the discharge limit is higher than the preset upper limit, and select the treatment path where the average value of resource recovery results is higher than the corresponding preset threshold and the average value of energy consumption results is lower than the corresponding preset threshold from the remaining treatment paths, and determine it as the main treatment path of the current operating cycle.

[0081] Regarding S2-1, it should be noted that at the start of the current operating cycle, corresponding sets of operating parameters are set for the anaerobic resource recovery treatment path, the electrochemical resource recovery treatment path, and the nutrient recovery treatment path, ensuring that each treatment path is in a definite state ready for direct operation when selected. Specifically, the influent flow rate setting limits the volume of wastewater entering the corresponding treatment unit per unit time, the temperature setting constrains the reaction environment within the reaction unit, the stirring intensity setting adjusts the mass transfer conditions, the electrode potential setting controls the driving force of the electrochemical reaction, and the dosage setting controls the addition level of the required chemical substances for the reaction. By pre-determining these operating parameters at the path level, it is ensured that subsequent comparisons of different treatment paths are based on clear and independent operating conditions.

[0082] Regarding S2-2, it should be noted that: after obtaining the influent parameters for the current operating cycle, historical operating cycles with influent parameters falling within the same value range are selected from historical operating records to ensure comparability between the selected historical operating cycles and the current operating cycle in terms of influent water quality conditions. The value ranges are divided based on organic matter concentration, salinity, nitrogen content, and phosphorus content parameters, ensuring that the selection of historical operating cycles does not rely on subjective judgment but is based on the objective condition that parameter values ​​fall within the same range. On this basis, the resource recovery results, energy consumption results, and effluent detection results generated under the corresponding treatment path for each historical operating cycle are extracted, providing a unified data foundation for subsequent quantitative calculations of the treatment effects of different treatment paths.

[0083] Regarding S2-3, it should be noted that: for each treatment path, the average resource recovery result under the same influent conditions is obtained by summing the corresponding resource recovery results from multiple selected historical operating cycles and dividing by the sample size; the average energy consumption result is obtained by performing the same calculation process on the energy consumption result; simultaneously, the proportion of effluent detection results exceeding the emission limit is obtained by counting the number of times the emission limit is exceeded in the effluent detection results and calculating the ratio with the total number of historical operating cycles; the above average values ​​and proportions quantitatively characterize the overall treatment effect of the treatment path under the current influent conditions from three aspects: resource acquisition, energy consumption, and effluent compliance.

[0084] Regarding S2-4, it should be noted that after obtaining the treatment effect calculation results for each treatment path, the treatment path with an excess of the effluent detection result exceeding the discharge limit is first eliminated by comparing the proportion of occurrences. This avoids selecting a treatment path that poses a significant risk to effluent under the current influent conditions. Among the remaining treatment paths, the average resource recovery result is compared with the corresponding resource recovery threshold, and the average energy consumption result is compared with the corresponding energy consumption threshold. Only the treatment path that simultaneously meets the requirements of high resource recovery and low energy consumption is determined as the main treatment path for the current operating cycle. Through the above step-by-step comparison process, the determination of the main treatment path is based on clear numerical judgment, rather than experience or subjective selection.

[0085] S2 also includes:

[0086] The anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path are all based on the existing treatment system. The treatment system includes at least an inlet main pipe, an inlet valve installed on the inlet main pipe, multiple treatment units, an outlet distribution branch, a reflux pump, and a dosing device. The multiple treatment units include an anaerobic reaction unit, an electrochemical reaction unit, and a nutrient recovery unit.

[0087] Each treatment path is defined by combining the opening state of the inlet valve, the operating state of the reflux pump, and the dosing state of the dosing device, and forms different fluid communication relationships with the corresponding treatment unit, thus constituting a preset combination of operating states that are distinct from each other. Here, the treatment unit refers to the functional module that undertakes specific resource recovery reaction functions in the same treatment system, which specifically includes an anaerobic reaction unit, an electrochemical reaction unit, and a nutrient recovery unit, used to realize anaerobic conversion, electrochemical conversion, and nutrient recovery, respectively. In different treatment paths, the treatment unit, as the actual reaction object of the wastewater, forms different fluid communication relationships with the inlet main pipe, the effluent distribution branch, and the reflux pump, thereby distinguishing each resource recovery treatment path.

[0088] It should be noted that the anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path are not new independent treatment structures, but are formed by pre-combining the operating states of existing components in the same existing treatment system. In the treatment system, the main inlet pipe is used to uniformly introduce the wastewater to be treated, the inlet valve is used to control whether the wastewater enters the treatment system, multiple treatment units undertake different types of resource recovery reaction functions, the effluent distribution branch is used to output the treated wastewater, the return pump is used to return part of the treated wastewater to the designated treatment unit, and the dosing device is used to add the chemical substances required for the reaction to the treatment unit.

[0089] Based on this, by separately limiting the opening or closing state of the inlet valve, the running or stopping state of the reflux pump, and the dosing or stopping state of the dosing device, and by ensuring that the wastewater only forms a specific fluid communication relationship with the corresponding treatment unit, the same treatment system is divided into distinct anaerobic resource recovery treatment paths, electrochemical resource recovery treatment paths, and nutrient recovery treatment paths at the operational level, so that different treatment paths can be selectively called and operated independently without changing the system structure.

[0090] In the anaerobic resource recovery treatment pathway, the treatment unit is an anaerobic reaction unit. The main inlet pipe is connected to the inlet of the anaerobic reaction unit, the gas production port of the anaerobic reaction unit is connected to the gas production output branch, and the outlet of the anaerobic reaction unit is connected to the effluent distribution branch. One end of the reflux pump is connected to the effluent distribution branch, and the other end is connected to the inlet of the anaerobic reaction unit, for returning a portion of the treated wastewater to the anaerobic reaction unit. The dosing device is connected to the inlet or reaction zone of the anaerobic reaction unit, for adding conditioning agents to the anaerobic reaction unit.

[0091] In the electrochemical resource recovery process, the treatment unit is an electrochemical reaction unit. The main inlet pipe is connected to the inlet of the electrochemical reaction unit, and the outlet of the electrochemical reaction unit is connected to the outlet distribution branch. The treatment system also includes an electrode control device electrically connected to the electrode port of the electrochemical reaction unit for controlling the electrode potential of the electrochemical reaction unit. One end of the reflux pump is connected to the outlet distribution branch or the reflux end of the electrochemical reaction unit, and the other end is connected to the inlet or cathode liquid reflux end of the electrochemical reaction unit to create the reflux conditions required for the electrochemical reaction.

[0092] In the nutrient recovery and treatment path, the treatment unit is a nutrient recovery unit. The main inlet pipe is connected to the nutrient recovery unit, and the nutrient recovery unit is connected to the solid-liquid separation unit. The solid-liquid separation unit is connected to the solid product branch and the filtrate branch, respectively, for outputting solid product and filtrate. The dosing device is connected to the nutrient recovery unit for adding a crystallization-promoting agent to the nutrient recovery unit. One end of the reflux pump is connected to the filtrate branch, and the other end is connected to the pretreatment unit or electrochemical reaction unit in the treatment system for reflux reuse of the filtrate.

[0093] In the anaerobic resource recovery treatment pathway, wastewater enters directly into the inlet of the anaerobic reactor unit via the main inlet pipe, ensuring that the wastewater participates solely in the anaerobic reaction process. The gas production port of the anaerobic reactor unit is connected to the gas production output branch to separately export the gas generated during the reaction, while the effluent port of the anaerobic reactor unit is connected to the effluent distribution branch to output the treated wastewater. A reflux pump connects one end to the effluent distribution branch and the other end to the inlet of the anaerobic reactor unit, allowing some of the treated wastewater to be recirculated and mixed with the newly entering wastewater to stabilize the reaction load. A dosing device is connected to the inlet or reaction zone of the anaerobic reactor unit to add regulating agents at the start of the reaction or during operation, thereby ensuring that the anaerobic reaction continues under the set conditions.

[0094] In the electrochemical resource recovery treatment pathway, wastewater enters the inlet of the electrochemical reaction unit through the main inlet pipe, where it undergoes an electrochemical reaction under the action of electrodes. The outlet of the electrochemical reaction unit is connected to the effluent distribution branch to discharge the wastewater after the reaction. The electrode control device is electrically connected to the electrode port of the electrochemical reaction unit, and its function is to adjust the electrode potential, thereby controlling the driving force and reaction intensity of the electrochemical reaction. The reflux pump is connected to the effluent distribution branch or the reflux end of the electrochemical reaction unit, and further connected to the inlet or catholyte reflux end of the electrochemical reaction unit, so that the treated liquid or catholyte forms a reflux to maintain the ionic and mass transfer conditions required for the reaction.

[0095] In the nutrient recovery process, wastewater enters the nutrient recovery unit through the main inlet pipe, where nitrogen and phosphorus in the wastewater undergo a recovery reaction. The nutrient recovery unit is connected to the solid-liquid separation unit to further separate the reacted mixture. The solid-liquid separation unit outputs solid products through a solid product branch and filtrate through a filtrate branch, structurally separating the recovered products from the liquid phase water. A dosing device is connected to the nutrient recovery unit to add agents that promote crystallization, ensuring the nutrient recovery reaction proceeds. A return pump connects one end to the filtrate branch and the other end to the pretreatment unit or electrochemical reaction unit, returning the filtrate to the system for reuse, thereby reducing water loss and improving overall resource utilization efficiency.

[0096] S3 includes:

[0097] S3-1. During the current operating cycle, the inlet valve is kept open so that wastewater is transported only through the main inlet pipe to the treatment unit corresponding to the main treatment path, and the treatment unit is operated according to the operating parameter group corresponding to the main treatment path.

[0098] S3-2. While the main processing path is being executed, the inlet valves of other processing paths that are not selected as the main processing path are controlled to be closed, or their corresponding processing units are controlled to enter a standby state to prevent wastewater from entering the other processing paths.

[0099] S3-3. During the duration of the operating cycle, the influent mutual exclusion state between the main treatment path and the other treatment paths is maintained, so that the same wastewater only acts on the treatment unit corresponding to the main treatment path, thereby avoiding multiple treatment paths acting on the same wastewater in the same operating cycle.

[0100] For S3-1, it should be noted that: within the current operating cycle, by controlling the inlet valve to be open, the wastewater entering the treatment system forms a unique transport path along the main inlet pipe and directly enters the treatment unit corresponding to the main treatment path, thereby physically defining the wastewater treatment target; at the same time, based on the operating parameter group determined in the aforementioned steps for the main treatment path, one or more control operations are performed on the treatment unit, such as inlet flow rate adjustment, temperature adjustment, stirring intensity adjustment, electrode potential adjustment, or chemical dosage adjustment, so that the treatment unit maintains an operating state that matches the main treatment path throughout the entire operating cycle;

[0101] Regarding S3-2, it should be noted that while the main treatment path is in operation, inlet water restrictions or operation restrictions are implemented on other treatment paths that are not selected as the main treatment path. Specifically, by closing the inlet valves corresponding to the other treatment paths, wastewater inflow can be cut off at the pipeline level; or, by switching the treatment units corresponding to the other treatment paths to standby mode, they do not receive inlet water or perform resource recovery reactions during the operating cycle, thereby ensuring that the other treatment paths do not participate in wastewater treatment during the current operating cycle.

[0102] Regarding S3-3, it should be noted that during the continuous operation cycle, by maintaining the main treatment path's inlet channel open and simultaneously keeping other treatment path inlets closed or their treatment units in standby mode, a stable inlet mutual exclusion relationship is formed during system operation. This ensures that wastewater entering the treatment system within the same operation cycle can only act on the treatment unit corresponding to the main treatment path. This mutual exclusion relationship prevents multiple treatment paths from simultaneously treating the same wastewater within the same operation cycle, thereby ensuring the controllability of the operation process and the concentration of resource utilization.

[0103] S4 includes:

[0104] S4-1. Compare the runtime or processing volume of the current running cycle with the preset end condition. When the end condition is met, determine that the current running cycle has ended.

[0105] The preset end conditions include: the cumulative running time in the current operating cycle reaches a preset fixed running time value, or the cumulative wastewater treated by the main treatment path in the current operating cycle reaches a preset fixed treatment volume value; wherein, the cumulative running time and the cumulative treatment volume are respectively used as direct comparison benchmarks in S4-1 to determine whether the current operating cycle has ended.

[0106] S4-2. After the current operating cycle ends, re-collect the influent parameters entering the treatment system and the corresponding main treatment path processing parameters, and combine the influent parameters and processing parameters into an updated parameter set.

[0107] S4-3. Execute S2 again based on the updated parameter set to determine the main processing path for the next running cycle;

[0108] For S4-1, it should be noted that: within the current operating cycle, the system continuously accumulates the operating time and the amount of wastewater treated through the main processing path, and directly compares the accumulated operating time value with a preset fixed operating time value, or directly compares the accumulated treatment volume value with a preset fixed treatment volume value; when either accumulated value reaches the corresponding fixed value, the determination of the end of the operating cycle is triggered, so that the termination of the operating cycle is based on clear quantitative conditions.

[0109] For S4-2, it should be noted that after determining the end of the current operating cycle, the system does not use the parameters from the previous cycle. Instead, it re-performs online monitoring of the wastewater entering the treatment system to obtain influent parameters reflecting the new influent water quality status. At the same time, it collects the operating status of the treatment units corresponding to the main treatment path in the previous operating cycle to obtain treatment process parameters, such as flow rate, temperature, electrode potential, or dosage. By unifying and aggregating the above influent parameters and treatment process parameters, an updated parameter set is formed for subsequent calculations, thereby avoiding the selection of treatment paths based on outdated or incomplete data.

[0110] Regarding S4-3, it should be noted that after the updated parameter set is formed, the system uses this updated parameter set as the new input condition and executes S2 again to recalculate and compare the processing effect of each processing path under the current water intake conditions and the latest operating state. In this way, the main processing path of the next operating cycle is not simply carried over from the previous cycle, but is re-determined based on the latest parameters, thereby achieving the matching between the processing path selection and the actual operating conditions during continuous operation.

[0111] S5 includes:

[0112] S5-1. In multiple consecutive running cycles, S3 is executed cycle by cycle according to the main processing path determined for each running cycle.

[0113] At the end of each running cycle, the resource recovery result value and energy consumption result value corresponding to the main processing path are recorded, and the difference between the resource recovery result value and energy consumption result value and the corresponding value of the processing path in the adjacent previous running cycle is calculated. When the difference is not equal to zero, the processing path is registered as a processing path that has participated in the rotation execution, which is used to restrict it from being determined as the main processing path again in the adjacent subsequent running cycle.

[0114] S5-2. During any operating cycle, keep the inlet valves of other treatment paths that are not determined as the main treatment path closed or keep their corresponding treatment units in standby mode, so that wastewater only enters the treatment unit corresponding to the main treatment path, thereby avoiding multiple treatment paths from treating the same wastewater at the same time in the same operating cycle.

[0115] S5-3. After multiple consecutive operating cycles, the maximum and minimum values ​​of the resource recovery result and energy consumption result values ​​corresponding to each processing path in the multiple operating cycles are calculated respectively, and the difference between the maximum and minimum values ​​is used as the resource recovery fluctuation value and energy consumption fluctuation value of the corresponding processing path.

[0116] When the resource recovery fluctuation value and energy consumption fluctuation value of each processing path do not exceed the preset allowable difference, the current processing path rotation execution order is maintained.

[0117] When the resource recovery fluctuation value or energy consumption fluctuation value of any processing path exceeds the allowable difference, the execution order or execution frequency of that processing path as the main processing path in subsequent operating cycles shall be adjusted.

[0118] Regarding S5-1, it should be noted that: in multiple continuous operation cycles of the system, each operation cycle first executes S3 according to the main processing path determined in that cycle; at the end of the operation cycle, the system records the actual resource recovery result value and energy consumption result value generated by the main processing path, and calculates the difference between the above values ​​and the corresponding values ​​recorded by the processing path in the adjacent previous operation cycle; when any difference is not zero, it indicates that the processing performance of the processing path has changed in the adjacent operation cycle, and the processing path is marked as a processing path that has participated in the rotation execution, so that it is selected as the main processing path again in the path determination process of the adjacent subsequent operation cycle, and the restriction conditions are imposed to avoid the same path continuously occupying processing resources in adjacent cycles;

[0119] Regarding S5-2, it should be noted that: within any operating cycle, once a certain treatment path is determined to be the main treatment path, the system controls the inlet valves of the other treatment paths to be closed, or switches their corresponding treatment units to standby mode, so that the wastewater entering the treatment system can only enter the treatment unit corresponding to the main treatment path within that operating cycle; in this way, the access of non-main treatment paths to wastewater is blocked at both the pipeline and equipment operation levels, thereby ensuring that there are no multiple treatment paths simultaneously treating the same wastewater within a single operating cycle;

[0120] Regarding S5-3, it should be noted that after multiple consecutive operating cycles, the system summarizes the resource recovery result values ​​and energy consumption result values ​​corresponding to each processing path within those multiple operating cycles. For each processing path, the maximum and minimum values ​​are calculated independently, and the difference between the two is used as the resource recovery fluctuation value and energy consumption fluctuation value for that processing path, respectively. When the resource recovery fluctuation value and energy consumption fluctuation value of each processing path do not exceed the pre-set allowable difference, it indicates that the processing effect under the current rotation execution order remains within an acceptable range, and the system continues to use the existing processing path rotation order. Conversely, when the resource recovery fluctuation value or energy consumption fluctuation value of any processing path exceeds the allowable difference, the system adjusts the execution order or execution frequency of that processing path as the main processing path in subsequent operating cycles, so that the cross-cycle operating results return to a stable range, thereby suppressing abnormal fluctuations in resource recovery and energy consumption over time.

[0121] A wastewater resource recovery system includes an identification module, a path selection module, a mutual exclusion module, an update module, and a stabilization module;

[0122] The identification module is used to perform online detection of wastewater entering the treatment system, obtain influent parameters characterizing organic matter concentration, salinity, and nitrogen and phosphorus content, and determine the priority direction for resource utilization treatment of the current wastewater based on the influent parameters.

[0123] Based on the influent parameters, the path selection module selects one of the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path as the main treatment path for the current operating cycle.

[0124] The mutual exclusion module is used to deliver wastewater only to the main treatment path during the operating cycle, and to implement control operations to suspend water intake or maintain standby for other treatment paths that are not selected, so as to avoid multiple treatment paths acting on the same wastewater at the same time.

[0125] The update module is used to re-collect the influent parameters and treatment process parameters after the operation cycle ends, and execute S2 again based on the updated parameters to determine the main treatment path for the next operation cycle.

[0126] The stabilization module reduces resource dispersion and energy loss caused by multi-path parallelism during the processing by alternately executing S3 on each processing path in different operating cycles, thereby achieving stable recovery of wastewater resources.

[0127] Working principle: The wastewater resource utilization method of the present invention can be understood as an operation mode of "judging by period and switching by result": First, when the wastewater enters the treatment system, the wastewater sampled at the same time is detected online to obtain the organic matter concentration parameter reflecting the amount of organic matter, the salinity parameter reflecting the salinity level, and the nitrogen content parameter and phosphorus content parameter reflecting the nitrogen and phosphorus content. Based on this, it is first determined whether the batch of wastewater is more suitable for gas production, power generation or nutrient recovery under the current state.

[0128] Based on this, three switchable operating modes are pre-established in the same set of treatment equipment: anaerobic resource utilization treatment path, electrochemical resource utilization treatment path, and nutrient recovery treatment path. Each treatment path corresponds to a specific treatment unit and operating parameters.

[0129] At the beginning of each operating cycle, instead of directly selecting a treatment path based on experience, the current influent parameters are compared with historical operating records to identify the resource recovery effect, energy consumption level, and effluent compliance of each treatment path in historical operating cycles with similar water quality conditions. Based on this, it is calculated which treatment path is relatively more advantageous and less risky under the current influent conditions, thereby determining the main treatment path for that operating cycle.

[0130] During the operating cycle, only wastewater is allowed to enter this main treatment path. Other treatment paths either do not accept water or remain in standby mode to avoid the same batch of wastewater being processed by multiple treatment paths at the same time, which would cause energy dispersion or operational interference.

[0131] When the current operating cycle reaches the preset running time or processing volume, the system ends the operation of the cycle, re-detects the new water inflow situation, and combines the results of the previous cycle to determine the main processing path to be used in the next cycle.

[0132] During continuous operation, the resource recovery and energy consumption changes of each treatment path are compared over multiple operating cycles. If it is found that the continuous operation of a certain treatment path leads to increased fluctuations in effect or abnormal energy consumption, its usage frequency in subsequent cycles is automatically reduced or its execution order is adjusted, so that different treatment paths are rotated in an orderly manner over time, thereby maintaining the stability of the wastewater resource recovery process even when the influent conditions are constantly changing.

[0133] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater resource recovery method, characterized in that, include: S1. Perform online detection on the wastewater entering the treatment system to obtain influent parameters characterizing organic matter concentration, salinity, and nitrogen and phosphorus content, and determine the priority direction for resource utilization treatment of the current wastewater based on the influent parameters. S2. Based on the influent parameters, select one of the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path as the main treatment path for the current operating cycle. S2 includes: S2-1. At the start of the current operating cycle, for the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path and nutrient salt recovery treatment path, determine the corresponding operating parameter group for the treatment path. The operating parameter group includes at least one or more of the following: influent flow rate setting value, temperature setting value, stirring intensity setting value, electrode potential setting value or dosage setting value. S2-2. Based on the influent parameters of the current operating cycle, select multiple historical operating cycles in the historical operating records where the influent parameters are in the same value range, and extract the resource recovery results, energy consumption results and effluent detection results of the historical operating cycles under the corresponding processing path. S2-3. For each treatment path, based on the selected historical operating cycle, calculate the average value of the resource recovery result, the average value of the energy consumption result, and the proportion of the effluent detection result exceeding the discharge limit corresponding to the treatment path, and use the average value and the proportion of occurrence as the treatment effect calculation result of the treatment path under the current influent conditions. S2-4. Compare the treatment effect calculation results of each treatment path, eliminate the treatment path where the proportion of effluent detection results exceeding the discharge limit is higher than the preset upper limit, and select the treatment path where the average value of resource recovery results is higher than the corresponding preset threshold and the average value of energy consumption results is lower than the corresponding preset threshold from the remaining treatment paths, and determine it as the main treatment path of the current operating cycle. S3. During the operating cycle, wastewater is only supplied to the main treatment path, and control operations are implemented to suspend water intake or maintain standby for other treatment paths that are not selected, so as to avoid multiple treatment paths acting on the same wastewater at the same time. S3 includes: S3-1. During the current operating cycle, the inlet valve is kept open so that wastewater is transported only through the main inlet pipe to the treatment unit corresponding to the main treatment path, and the treatment unit is operated according to the operating parameter group corresponding to the main treatment path. S3-2. While the main processing path is being executed, the inlet valves of other processing paths that are not selected as the main processing path are controlled to be closed, or their corresponding processing units are controlled to enter a standby state to prevent wastewater from entering the other processing paths. S3-3. During the duration of the operating cycle, the influent mutual exclusion state between the main treatment path and the other treatment paths is maintained, so that the same wastewater only acts on the treatment unit corresponding to the main treatment path, thereby avoiding multiple treatment paths acting on the same wastewater in the same operating cycle. S4. After the operation cycle ends, the influent parameters and treatment process parameters are collected again, and S2 is executed again based on the updated parameters to determine the main treatment path for the next operation cycle. S5. By alternately executing S3 on each processing path in different operating cycles, the resource dispersion and energy loss caused by multi-path parallelism during the processing are reduced, thereby realizing the recycling of wastewater resources. S5 includes: S5-1. In multiple consecutive running cycles, S3 is executed cycle by cycle according to the main processing path determined for each running cycle. At the end of each running cycle, the resource recovery result value and energy consumption result value corresponding to the main processing path are recorded, and the difference between the resource recovery result value and energy consumption result value and the corresponding value of the main processing path in the adjacent previous running cycle is calculated. When the difference is not equal to zero, the main processing path is registered as a processing path that has participated in the rotation execution. S5-2. During any operating cycle, keep the inlet valves of other treatment paths that are not determined as the main treatment path closed or keep their corresponding treatment units in standby mode, so that wastewater only enters the treatment unit corresponding to the main treatment path. S5-3. After multiple consecutive operating cycles, the maximum and minimum values ​​of the resource recovery result and energy consumption result values ​​corresponding to each processing path in the multiple operating cycles are calculated respectively, and the difference between the maximum and minimum values ​​is used as the resource recovery fluctuation value and energy consumption fluctuation value of the corresponding processing path. When the resource recovery fluctuation value and energy consumption fluctuation value of each processing path do not exceed the preset allowable difference, the current processing path rotation execution order is maintained. When the resource recovery fluctuation value or energy consumption fluctuation value of any processing path exceeds the allowable difference, the execution order or execution frequency of any processing path as the main processing path in the subsequent operating cycle shall be adjusted.

2. The wastewater resource recovery method according to claim 1, characterized in that: S1 includes: S1-1. Perform online monitoring of the wastewater entering the treatment system to obtain parameters such as organic matter concentration, salinity, nitrogen content, and phosphorus content. S1-2. Compare the organic matter concentration parameter and salinity parameter with the preset threshold set item by item. When condition one is met: the organic matter concentration parameter is not less than the organic matter threshold and the salinity parameter is not greater than the salinity threshold, determine the priority direction of resource utilization treatment as anaerobic resource utilization treatment. When condition one is not met but condition two is met: the organic matter concentration parameter is not less than another preset organic matter threshold and the salinity parameter is not greater than another preset salinity threshold, the priority direction for resource recovery treatment is determined to be the electrochemical resource recovery treatment direction. When the nitrogen content parameter and the phosphorus content parameter meet condition three: the nitrogen-phosphorus ratio is within the preset nitrogen-phosphorus ratio range, the priority direction for resource recovery treatment is determined to be the nutrient salt recovery treatment direction. S1-3, Output the determined priority direction for resource processing.

3. The wastewater resource recovery method according to claim 2, characterized in that: S2 also includes: The anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path are all based on the existing treatment system. The treatment system includes at least an inlet main pipe, an inlet valve installed on the inlet main pipe, multiple treatment units, an outlet distribution branch, a reflux pump, and a dosing device. The multiple treatment units include an anaerobic reaction unit, an electrochemical reaction unit, and a nutrient recovery unit. Each processing path is defined by combining the opening state of the inlet valve, the operating state of the return pump, and the dosing state of the dosing device, and forms different fluid communication relationships with the corresponding processing unit, thus forming a preset combination of operating states that are distinct from each other. In the anaerobic resource recovery treatment pathway, the treatment unit is an anaerobic reaction unit. The main inlet pipe is connected to the inlet of the anaerobic reaction unit, the gas production port of the anaerobic reaction unit is connected to the gas production output branch, and the outlet of the anaerobic reaction unit is connected to the effluent distribution branch. One end of the reflux pump is connected to the effluent distribution branch, and the other end is connected to the inlet of the anaerobic reaction unit, for returning a portion of the treated wastewater to the anaerobic reaction unit. The dosing device is connected to the inlet or reaction zone of the anaerobic reaction unit, for adding conditioning agents to the anaerobic reaction unit. In the electrochemical resource recovery process, the treatment unit is an electrochemical reaction unit. The main inlet pipe is connected to the inlet of the electrochemical reaction unit, and the outlet of the electrochemical reaction unit is connected to the outlet distribution branch. The treatment system also includes an electrode control device electrically connected to the electrode port of the electrochemical reaction unit for controlling the electrode potential of the electrochemical reaction unit. One end of the reflux pump is connected to the outlet distribution branch or the reflux end of the electrochemical reaction unit, and the other end is connected to the inlet or cathode liquid reflux end of the electrochemical reaction unit to create the reflux conditions required for the electrochemical reaction. In the nutrient recovery and treatment path, the treatment unit is a nutrient recovery unit. The main inlet pipe is connected to the nutrient recovery unit, and the nutrient recovery unit is connected to the solid-liquid separation unit. The solid-liquid separation unit is connected to the solid product branch and the filtrate branch, respectively, for outputting solid product and filtrate. The dosing device is connected to the nutrient recovery unit and is used to add a crystallization-promoting agent to the nutrient recovery unit. One end of the reflux pump is connected to the filtrate branch, and the other end is connected to the pretreatment unit or electrochemical reaction unit in the treatment system, for reflux reuse of the filtrate.

4. The wastewater resource recovery method according to claim 3, characterized in that: S4 includes: S4-1. Compare the runtime or processing volume of the current running cycle with the preset end condition. When the end condition is met, determine that the current running cycle has ended. The preset termination conditions include: the cumulative running time in the current operating cycle reaches a preset fixed running time value, or the cumulative wastewater treated by the main treatment path in the current operating cycle reaches a preset fixed treatment volume value; wherein, the cumulative running time and cumulative treatment volume are respectively used as direct comparison benchmarks in S4-1 to determine whether the current operating cycle has ended. S4-2. After the current operating cycle ends, re-collect the influent parameters entering the treatment system and the corresponding main treatment path processing parameters, and combine the influent parameters and processing parameters to form an updated parameter set. S4-3. Execute S2 again based on the updated parameter set to determine the main processing path for the next running cycle.

5. A wastewater resource recovery system for implementing the wastewater resource recovery method according to any one of claims 1-4, the system comprising an identification module, a path selection module, a mutual exclusion module, an update module, and a stabilization module, characterized in that: The identification module is used to perform online detection of wastewater entering the treatment system, obtain influent parameters characterizing organic matter concentration, salinity, and nitrogen and phosphorus content, and determine the priority direction for resource utilization treatment of the current wastewater based on the influent parameters. Based on the influent parameters, the path selection module selects one of the preset anaerobic resource recovery treatment path, electrochemical resource recovery treatment path, and nutrient recovery treatment path as the main treatment path for the current operating cycle. The mutual exclusion module is used to deliver wastewater only to the main treatment path during the operating cycle, and to implement control operations to suspend water intake or maintain standby for other treatment paths that are not selected, so as to avoid multiple treatment paths acting on the same wastewater at the same time. The update module is used to re-collect the influent parameters and treatment process parameters after the operation cycle ends, and execute S2 again based on the updated parameters to determine the main treatment path for the next operation cycle. The stabilization module reduces resource dispersion and energy loss caused by multi-path parallelism during the processing by alternately executing S3 on each processing path in different operating cycles, thereby achieving wastewater resource recovery.

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