An integrated system for water treatment and nutrient recovery

Abstract

The present application relates to wastewater treatment technical field, specifically for a kind of integrated system for water treatment and nutrient recovery, comprising: wastewater collection unit collects hydrogen production process wastewater, real-time monitoring water quality and quantity and wastewater flow;Pretreatment unit removes suspended solids and coarse impurities in wastewater by grid, sedimentation tank, adjusts water quality and quantity to stable state using adjusting tank;Nutrient separation and recovery unit separates ammonia nitrogen, phosphorus, potassium nutrient salt and water by nanofiltration membrane, enriches and concentrates nutrient solution, and transports concentrated nutrient solution to organic fertilizer workshop;Advanced purification unit carries out adsorption and impurity removal and disinfection treatment to nanofiltration water;Clean water reuse unit transports up-to-standard clean water to raw material cleaning, fermentation water replenishment, equipment cleaning link, and carries out water resource reuse;Intelligent control unit real-time monitoring operating parameter of water consumption link, based on controller linkage water quality sensor and executing component, automatically optimizes and adjusts operating condition. Therefore, the problems of low utilization rate and poor running stability in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an integrated system for water treatment and nutrient recovery. Background Technology

[0002] With the rapid development of the hydrogen energy industry, the entire hydrogen production process (such as biomass fermentation hydrogen production and water electrolysis hydrogen production processes) generates a large amount of wastewater, including various types such as fermentation leachate, steam condensate, and equipment cleaning wastewater. This type of wastewater is not only complex in quality, containing nutrients such as ammonia nitrogen, phosphorus, and potassium, but also contains suspended solids, organic matter, and trace pollutants. Direct discharge would lead to water waste and environmental pollution; furthermore, the nutrients in the wastewater are not effectively recovered, resulting in low resource utilization.

[0003] However, traditional treatment methods have significant drawbacks: First, wastewater treatment and nutrient recovery are disconnected, resulting in ineffective utilization of nutrient resources and resource waste. Second, the treatment process lacks a closed-loop design, leading to low water reuse rates and an inability to meet the water requirements of hydrogen production processes. Third, membrane separation units are susceptible to fouling, and the lack of targeted cleaning and early warning mechanisms results in decreased separation efficiency and increased operating costs. Fourth, system operation relies on manual control, making it poorly adaptable to fluctuations in water quality and quantity, and difficult to ensure stable effluent quality. Therefore, there is an urgent need for an integrated system that achieves closed-loop wastewater treatment, efficient nutrient recovery, and intelligent control to address the problems of low resource utilization, poor operational stability, and low level of intelligence in existing technologies. Summary of the Invention

[0004] This application provides an integrated system for water treatment and nutrient recovery to solve problems such as low utilization rate and poor operational stability in the prior art.

[0005] The first aspect of this application provides an integrated system for water treatment and nutrient recovery, comprising: a wastewater collection unit, a pretreatment unit, a nutrient separation and recovery unit, a deep purification unit, a clean water reuse unit, and an intelligent control unit; wherein the wastewater collection unit is connected to the pretreatment unit, the pretreatment unit is connected to the nutrient separation and recovery unit, the nutrient separation and recovery unit is connected to the deep purification unit, the deep purification unit is connected to the clean water reuse unit, and the intelligent control unit is linked with each of the other units; wherein the wastewater collection unit is used to collect wastewater from the entire hydrogen production process in a classified manner and to monitor water quality, quantity, and flow rate in real time; the pretreatment unit is used to remove pollutants through a screen and a sedimentation tank... The wastewater is treated to remove suspended solids and coarse impurities. A regulating tank is used to stabilize the water quality and quantity, and control the pH value. The nutrient separation and recovery unit separates ammonia nitrogen, phosphorus, and potassium nutrients from water using a nanofiltration membrane, enriching and concentrating the nutrient solution, which is then quantitatively delivered to the organic fertilizer workshop. The deep purification unit adsorbs impurities and disinfects the nanofiltration permeate to obtain purified water that meets standards. The clean water reuse unit delivers the purified water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages for water resource reuse. The intelligent control unit monitors the operating parameters of the water-using process in real time, and automatically optimizes and adjusts operating conditions based on a PLC controller that links water quality sensors and actuators.

[0006] Preferably, the wastewater collection unit includes separate collection pipelines, an online water quality and quantity monitoring instrument, and a main collection tank. The separate collection pipelines collect fermentation leachate, steam condensate, and equipment cleaning wastewater, respectively. The online water quality and quantity monitoring instrument is used to monitor the wastewater pH, chemical oxygen demand, ammonia nitrogen, total phosphorus, total potassium concentration, and wastewater flow rate in real time. The main collection tank is used to collect wastewater and is equipped with a level sensor to automatically start and stop the drainage pump.

[0007] Preferably, the pretreatment unit includes a mechanical bar screen, an inclined tube sedimentation tank, and an equalization tank. The mechanical bar screen is used to remove large impurities such as branches and plastics from the wastewater. The inclined tube sedimentation tank uses honeycomb inclined tubes to remove suspended solids through sedimentation. The equalization tank is equipped with an automatic pH adjustment device and an online water quality monitor to monitor multiple water quality indicators in real time. The pH is adjusted to a suitable range by adding acid and alkali reagents, and the water in the tank is uniformly mixed using a stirring device to ensure a stable hydraulic retention time.

[0008] Preferably, the nutrient separation and recovery unit includes a nanofiltration membrane device, a concentrate storage tank, a metering pump, and an online chemical cleaning module. The nanofiltration membrane device uses an anti-fouling spiral wound composite membrane to separate nutrients from water. The concentrate storage tank stores the high-concentration nutrient concentrate enriched by membrane separation. The metering pump precisely controls the amount of concentrate delivered to the organic fertilizer preparation workshop, ensuring the concentrate addition ratio meets the conditioning requirements of organic fertilizer. The online chemical cleaning module uses alternating cleaning with specific chemical agents to specifically remove contaminants adhering to the membrane surface, quickly restoring membrane flux and maintaining membrane separation efficiency.

[0009] Preferably, the deep purification unit includes an activated carbon adsorption tower and an ultraviolet disinfection device. The activated carbon adsorption tower is equipped with an online regeneration device for adsorbing residual organic matter, odors, and some trace pollutants in the nanofiltration product water. After the adsorption performance of the activated carbon decreases, its adsorption capacity is restored through thermal regeneration, and the activated carbon is reused. The ultraviolet disinfection device uses low-pressure, high-intensity ultraviolet lamps to efficiently kill E. coli microorganisms in the wastewater. The surface of the lamps is cleaned regularly to obtain purified water that meets the standards.

[0010] Preferably, the clean water reuse unit includes a clean water storage tank, a constant pressure water supply device, a reuse pipeline, and a water quality safety early warning device. The clean water storage tank is used to prevent corrosion of the inner wall of the tank from contaminating the clean water and to ensure the safety of the reused water quality. The constant pressure water supply device is used to automatically adjust the water supply pressure and flow rate according to the real-time flow demand of each water usage stage. The reuse pipeline is used to accurately distribute water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages. The water quality safety early warning device is used to monitor the effluent water quality in real time; when the effluent water quality is detected to be substandard, it automatically cuts off the reuse pipeline and switches the effluent to the emergency treatment tank.

[0011] Preferably, the intelligent control unit includes a controller, a sensor network, a water quality prediction model, a membrane fouling early warning model, and a remote monitoring terminal. The controller is used to coordinate various sensors, flow regulating valves, and pump actuators to automatically adjust system operating parameters and quickly respond to changes in the operating status of each unit, ensuring that the operating parameters are within the optimal range. The sensor network is used to comprehensively collect water quality, flow rate, pressure, and liquid level operating data at each stage of wastewater collection, pretreatment, membrane separation, deep purification, and reuse. The water quality prediction model is used to predict water quality change trends and adjust operating parameters in advance. The membrane fouling early warning model, based on membrane module pressure difference, influent turbidity, and operating time parameters, predicts membrane fouling development trends, issues cleaning warnings in advance, and promptly carries out membrane cleaning. The remote monitoring terminal allows users to view system operating data in real time, receive equipment fault or water quality anomaly warnings, and remotely adjust system operating parameters for remote management and maintenance.

[0012] The second aspect of this application provides an integrated method for water treatment and nutrient recovery, comprising: acquiring wastewater from the entire hydrogen production process; treating the wastewater by real-time monitoring of its pH value, chemical oxygen demand, ammonia nitrogen, total phosphorus, total potassium concentration, and flow rate; removing coarse impurities through a mechanical screen and separating suspended solids through a honeycomb inclined tube sedimentation tank; adjusting the pH value of the water to a suitable range in an equalization tank using an automatic pH adjustment device to obtain stable wastewater; based on the stable wastewater, separating ammonia nitrogen, phosphorus, potassium nutrients, and water from the wastewater through a nanofiltration membrane, enriching and concentrating the nutrient solution; transporting the concentrated nutrient solution to an organic fertilizer preparation workshop to meet the conditioning requirements of organic fertilizer; simultaneously collecting nanofiltration permeate; performing adsorption, impurity removal, and disinfection treatment on the nanofiltration permeate to obtain purified water that meets standards; and transporting the purified water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages by adjusting the water supply pressure and flow rate through a constant pressure water supply device, while simultaneously monitoring the operating parameters of the water-using stages in real time and automatically optimizing and adjusting the operating conditions.

[0013] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement an integrated method for water treatment and nutrient recovery as described in the above embodiments.

[0014] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement an integrated method for water treatment and nutrient recovery as described in the above embodiments.

[0015] Therefore, this application has the following beneficial effects: This application embodiment achieves classified collection and real-time monitoring of water quality and quantity of wastewater throughout the hydrogen production process through a wastewater collection unit, providing accurate data support for subsequent treatment; a pretreatment unit efficiently removes impurities and adjusts water quality and quantity to a stable state, laying a solid foundation for subsequent treatment; a nutrient separation and recovery unit uses an anti-fouling nanofiltration membrane to accurately separate and enrich ammonia nitrogen, phosphorus, potassium nutrients and water, realizing the resource reuse of nutrients and reducing resource waste; a deep purification unit uses activated carbon adsorption and ultraviolet disinfection in combination to obtain purified water that meets standards; a clean water reuse unit accurately allocates the qualified clean water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages, maximizing water resource conservation; and an intelligent control unit relies on a sensor network and a dual prediction model for water quality and membrane fouling to achieve automatic optimization of operating parameters, fault warning, and remote control, significantly improving the system's operational stability and intelligent operation and maintenance level. Thus, it solves the problems of low utilization rate and poor operational stability in existing technologies.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of an integrated system for water treatment and nutrient recovery provided according to an embodiment of this application; Figure 2 This is a schematic diagram of an integrated system for water treatment and nutrient recovery provided according to an embodiment of this application; Figure 3 This is a flowchart of an integrated method for water treatment and nutrient recovery according to an embodiment of this application; Figure 4 This is a schematic diagram of an integrated method for water treatment and nutrient recovery according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The following description, with reference to the accompanying drawings, illustrates an integrated system for water treatment and nutrient recovery according to an embodiment of this application. Addressing the issue of poor operational stability mentioned in the background section, this application provides an integrated system for water treatment and nutrient recovery. In this system, a wastewater collection unit enables the classified collection and real-time monitoring of wastewater from the entire hydrogen production process, providing precise data support for subsequent treatment. A pretreatment unit efficiently removes impurities and adjusts the water quality and quantity to a stable state, laying a solid foundation for subsequent treatment. A nutrient separation and recovery unit uses an anti-fouling nanofiltration membrane to precisely separate and enrich ammonia nitrogen, phosphorus, potassium nutrients, and water, achieving resource reuse of nutrients and reducing resource waste. A deep purification unit uses activated carbon adsorption combined with ultraviolet disinfection to obtain purified water that meets standards. A clean water reuse unit precisely allocates the purified water to raw material cleaning, fermentation water replenishment, and equipment cleaning stages, maximizing water resource conservation. An intelligent control unit relies on a sensor network and a dual prediction model for water quality and membrane fouling to achieve automatic optimization of operating parameters, fault warning, and remote control, significantly improving system operational stability and intelligent operation and maintenance levels. This solves the problems of low utilization and poor operational stability in existing technologies.

[0020] Figure 1 This is a schematic diagram of an integrated system for water treatment and nutrient recovery provided in an embodiment of this application.

[0021] This application provides an integrated system for water treatment and nutrient recovery, the system 10 comprising: Wastewater collection unit 100, pretreatment unit 200, nutrient separation and recovery unit 300, deep purification unit 400, clean water reuse unit 500, and intelligent control unit 600.

[0022] The wastewater collection unit 100 is used to collect wastewater from the entire hydrogen production process in a classified manner, and to monitor the water quality, quantity, and flow rate in real time. The pretreatment unit 200 is used to remove suspended solids and coarse impurities from the wastewater through a screen and sedimentation tank, and to adjust the water quality and quantity to a stable state through an equalization tank, while controlling the pH value. The nutrient separation and recovery unit 300 is used to separate ammonia nitrogen, phosphorus, potassium nutrients, and water through a nanofiltration membrane, enrich and concentrate the nutrient solution, and quantitatively deliver the concentrated nutrient solution to the organic fertilizer workshop. The deep purification unit 400 is used to adsorb impurities and disinfect the nanofiltration permeate to obtain purified water that meets the standards. The clean water reuse unit 500 is used to deliver the qualified clean water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages for water resource reuse. The intelligent control unit 600 is used to monitor the operating parameters of the water use process in real time, and to automatically optimize and adjust the operating conditions based on the PLC controller linking the water quality sensors and actuators.

[0023] It is understood that in this embodiment, the wastewater collection unit achieves classified collection and real-time monitoring of water quality and quantity throughout the hydrogen production process, providing accurate data support for subsequent treatment; the pretreatment unit efficiently removes impurities and adjusts water quality and quantity to a stable state, laying a solid foundation for subsequent treatment; the nutrient separation and recovery unit uses an anti-fouling nanofiltration membrane to accurately separate and enrich ammonia nitrogen, phosphorus, potassium nutrients and water, realizing the resource reuse of nutrients and reducing resource waste; the deep purification unit uses activated carbon adsorption and ultraviolet disinfection in combination to obtain purified water that meets standards; the clean water reuse unit accurately allocates the qualified clean water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages, maximizing water resource conservation; the intelligent control unit relies on a sensor network and a dual prediction model for water quality and membrane fouling to achieve automatic optimization of operating parameters, fault warning, and remote control, greatly improving the system's operational stability and intelligent operation and maintenance level, thereby solving the problems of low utilization rate and poor operational stability in the prior art.

[0024] In this embodiment, the wastewater collection unit 100 includes: a classified collection pipeline, an online water quality and quantity monitoring instrument, and a main collection tank.

[0025] The separate collection pipelines collect fermentation leachate, steam condensate, and equipment cleaning wastewater respectively; the online water quality and quantity monitoring instrument is used to monitor the wastewater pH value, chemical oxygen demand, ammonia nitrogen, total phosphorus, total potassium concentration, and wastewater flow rate in real time; the main collection tank is used to collect wastewater and is equipped with a liquid level sensor to automatically start and stop the drainage pump.

[0026] It is understood that the embodiments of this application achieve precise diversion and collection of hydrogen production multi-element wastewater through classified collection pipelines, avoiding the increased treatment difficulty caused by the mixing of different types of wastewater; the online water quality and quantity monitoring instrument captures key water quality indicators and flow data in real time, providing real-time basis for the operation and adjustment of subsequent units; the automatic liquid level control function of the total collection tank ensures continuous and stable wastewater collection.

[0027] For example, in a biomass hydrogen production plant, the wastewater collection unit's separate collection pipelines are connected to the leachate from the fermentation workshop (daily output 50m³). 3 ), condensate from steam boilers (daily output 30m³) 3 Wastewater from the equipment cleaning workshop (daily output 20m³) 3 The three types of wastewater are transported to the main collection tank (10m³) via their respective pipelines. 3 The online water quality and quantity monitoring instrument monitored the fermentation leachate in real time, finding COD concentrations of 3500 mg / L, ammonia nitrogen of 80 mg / L, total phosphorus of 15 mg / L, and total potassium of 25 mg / L; the steam condensate wastewater showed COD concentrations of 50 mg / L and ammonia nitrogen of 5 mg / L; and the equipment cleaning wastewater showed COD concentrations of 800 mg / L and suspended solids of 200 mg / L. Flow data was uploaded to the intelligent control unit in real time. When the total collection tank level reached 8m... 3 When the tank is 80% full, the drainage pump automatically starts to transport the wastewater to the pretreatment unit, and the liquid level drops to 2m. 3 The pump stops when the pool volume reaches 20% to ensure a continuous and uninterrupted collection process.

[0028] In this embodiment of the application, the pretreatment unit 200 includes: a mechanical bar screen, an inclined tube sedimentation tank, and an equalization tank.

[0029] Among them, mechanical bar screens are used to remove large impurities such as branches and plastics from wastewater; inclined tube sedimentation tanks use honeycomb inclined tubes to remove suspended solids through sedimentation; equalization tanks are equipped with automatic pH adjustment devices and online water quality monitors to monitor multiple water quality indicators in real time, adjust the pH to a suitable range by adding acid and alkali reagents, and use stirring devices to evenly mix the water in the tank to ensure stable hydraulic retention time.

[0030] It is understood that the embodiments of this application use mechanical bar screens and inclined tube sedimentation tanks to remove coarse impurities and suspended solids in stages, thereby reducing the risk of subsequent membrane module fouling. The automatic pH adjustment and water mixing function of the equalization tank effectively mitigates the impact of fluctuations in the quality and quantity of hydrogen production wastewater on the treatment effect, provides stable influent conditions for the nutrient separation and recovery unit, and improves membrane separation efficiency and service life.

[0031] For example, the mixed wastewater (daily treatment capacity 100m³) from a hydrogen production plant. 3 After entering the pretreatment unit, the wastewater first passes through a 5mm mechanical screen to intercept and remove large impurities such as tree branches and plastic fragments. When the pressure difference between the screen and the wastewater reaches 5kPa, a chain-type automatic sludge removal device is activated, transporting the intercepted impurities to a waste sludge collection box. The sludge removal frequency is approximately once every 2 hours. Subsequently, the wastewater enters an inclined tube sedimentation tank. Under the action of honeycomb inclined tubes with a 50mm aperture and a 60° inclination angle, suspended solids are separated by gravity sedimentation. After a hydraulic retention of 1.5 hours, the suspended solids removal rate reaches 88%, and the effluent turbidity drops to below 30 NTU. Finally, the wastewater enters the equalization tank. The online water quality monitor detects an influent pH value of 5.8. The intelligent control unit issues a command, and the pH automatic adjustment device adds 30% sulfuric acid solution to adjust the pH value to 7.2. The paddle-type agitator mixes the water in the tank evenly at a speed of 60 r / min, ensuring a hydraulic retention time of 2 hours, so that the effluent quality and quantity are stable, and the average COD concentration is controlled at around 1200 mg / L, providing high-quality influent for the subsequent nutrient separation and recovery unit.

[0032] In this embodiment, the nutrient separation and recovery unit 300 includes: a nanofiltration membrane device, a concentrate storage tank, a metering pump, and an online chemical cleaning module.

[0033] The nanofiltration membrane device uses an anti-fouling spiral wound composite membrane to separate nutrients from water; the concentrate storage tank is used to store the high-concentration nutrient concentrate enriched by membrane separation; the metering pump is used to precisely control the amount of concentrate delivered to the organic fertilizer preparation workshop, so that the concentration ratio meets the conditioning requirements of organic fertilizer; the online chemical cleaning module uses a specific chemical agent alternating cleaning method to specifically remove contaminants attached to the membrane surface, quickly restore membrane flux, and maintain membrane separation efficiency.

[0034] It is understood that the nanofiltration membrane device in this application achieves efficient separation of nutrients and water through optimized membrane parameter design, providing core technical support for nutrient recovery; the storage and stirring functions of the concentrate storage tank ensure uniform concentrate concentration, facilitating subsequent resource utilization; the precise flow control of the metering pump ensures that the concentrate addition ratio meets the requirements of organic fertilizer preparation, improving the practicality of resource recovery; the targeted cleaning process of the online chemical cleaning module effectively controls membrane fouling, extends membrane life, and ensures the long-term stable operation of the membrane separation unit.

[0035] For example, pretreated stable wastewater (pH 7.0-7.5, COD 1200 mg / L, ammonia nitrogen 35 mg / L, total phosphorus 8 mg / L, total potassium 12 mg / L) enters the nutrient separation and recovery unit. The nanofiltration membrane device operates at a pressure of 1.0 MPa and a temperature of 30°C. The antifouling spiral wound composite nanofiltration membrane achieves a 92% rejection rate for ammonia nitrogen, 96% for total phosphorus, and 93% for total potassium, realizing highly efficient separation of nutrients from water. The permeate (nanofiltration permeate) enters the deep purification unit, while the retained nutrients form a concentrated solution (6-fold concentration) which is then transported to a 5m... 3 The concentrate storage tank has a continuously running agitator (30 rpm) to ensure uniform concentrate concentration (total nutrient content 12%). A variable frequency screw metering pump, with a speed of 2m³ / min, is used to meet the production needs of the organic fertilizer preparation workshop. 3 A flow rate of / h precisely delivers the concentrate to the conditioning process, ensuring the nutrient content of the organic fertilizer meets industry standards. After 15 days of operation, the membrane flux increased from the initial 80L / (m²) 2 •h) decreased to 56L / (m 2 •h) (70% of the initial value), the online chemical cleaning module automatically starts, sequentially performing alkaline washing (0.5% sodium hydroxide + 0.1% sodium hypochlorite mixed solution, circulation 60 min), water washing (30 min), acid washing (0.5% citric acid solution, circulation 40 min), and water washing (30 min). After cleaning, the membrane flux recovers to 75 L / (m²). 2 •h), with a recovery rate of 93.75%, ensuring stable membrane separation efficiency.

[0036] In this embodiment, the deep purification unit 400 includes: an activated carbon adsorption tower and an ultraviolet disinfection device.

[0037] The activated carbon adsorption tower is equipped with an online regeneration device to adsorb residual organic matter, odors and some trace pollutants in nanofiltration water. After the adsorption performance of activated carbon declines, its adsorption capacity is restored through thermal regeneration, and the activated carbon can be reused. The ultraviolet disinfection device uses low-pressure high-intensity ultraviolet lamps to efficiently kill E. coli microorganisms in wastewater. The surface of the lamps is cleaned regularly to obtain purified water that meets the standards.

[0038] It is understood that the activated carbon adsorption tower in this application embodiment is designed with high-performance activated carbon filling and thermal regeneration device to efficiently remove residual pollutants in nanofiltration permeate, while realizing the reuse of activated carbon and reducing operating costs; the ultraviolet disinfection device, with optimized lamp parameters and automatic cleaning function, achieves efficient killing of microorganisms, ensuring that the water meets the standards and providing a safety guarantee for water reuse.

[0039] For example, nanofiltration permeate (COD 80 mg / L, noticeable odor, microbial content 500 CFU / mL) enters the deep purification unit, first flowing through an activated carbon adsorption tower filled with granular activated carbon (particle size 2-4 mm, specific surface area 1100 m²). 2 The device efficiently adsorbs residual organic matter and odor substances, achieving a COD removal rate of 35%, reducing the effluent COD to 52 mg / L, and completely eliminating odors. The water then flows into a UV disinfection unit, where a low-pressure, high-intensity UV lamp with a wavelength of 254 nm and a power of 30 W generates an irradiation dose of 35 mJ / cm². 2 The ultraviolet light effectively kills microorganisms such as E. coli, achieving a sterilization rate of 99.95%, reducing the microbial content in the effluent to 0.25 CFU / mL. After 30 days of operation, the adsorption performance of activated carbon decreased, and the COD removal rate dropped to 28%. The steam thermal regeneration device was then activated, regenerating at 130℃ for 4 hours. After regeneration, the adsorption capacity of the activated carbon recovered to 95% of its initial state, allowing it to be reused up to 6 times. The automatic sludge scraping device of the ultraviolet disinfection unit automatically starts every Sunday morning to clean the dirt on the surface of the lamps, ensuring stable ultraviolet transmittance and guaranteeing continuous and reliable disinfection effects.

[0040] In this embodiment, the clean water reuse unit 500 includes: a clean water storage tank, a constant pressure water supply device, a reuse pipeline, and a water quality safety early warning device.

[0041] Among them, the clear water storage tank is used to prevent the inner wall of the tank from rusting and contaminating the clear water, and to ensure the safety of the recycled water quality; the constant pressure water supply device is used to automatically adjust the water supply pressure and flow according to the real-time flow demand of the water use process; the reuse pipeline is used to accurately allocate water volume and deliver it to the raw material cleaning, fermentation water replenishment, and equipment cleaning processes respectively; the water quality safety early warning device is used to monitor the effluent water quality in real time, and when the effluent water quality is detected to be substandard, it automatically cuts off the reuse pipeline and switches the effluent to the emergency treatment pool.

[0042] It is understood that the embodiments of this application ensure the safety of recycled water quality from the source through a clean water storage tank; the frequency conversion regulation function of the constant pressure water supply device accurately adapts to the flow and pressure requirements of each water use link, improving the efficiency of water resource utilization; the branch design and metering control of the recycled pipeline realize the precise allocation of water resources; and the real-time monitoring and emergency switching function of the water quality safety early warning device build a safety defense line for recycled water, ensuring a stable supply of qualified clean water to the hydrogen production process.

[0043] For example, the deeply purified water that meets the standards (pH 7.2, COD 52 mg / L, conductivity 80 μS / cm, microbial content 0.25 CFU / mL) enters the clean water reuse unit, and the clean water storage tank (10 m³ / mL) is made of 304 stainless steel. 3The water storage area features an anti-corrosion treatment on the inner wall to effectively prevent rust and contamination. The variable frequency centrifugal pump in the constant pressure water supply system automatically adjusts its operation according to the water demand of each stage: the raw material cleaning stage requires 30m³ of water. 3 / h, water supply pressure 0.25MPa, water requirement for fermentation replenishment stage 20m³ 3 / h, water supply pressure 0.3MPa, water consumption required for equipment cleaning 15m³ / h 3 With a water supply pressure of 0.35 MPa and a flow rate of [value missing], the pump body is precisely adapted through frequency conversion regulation, and the flow rate regulation accuracy is controlled within ±0.1 m³ / h. 3 / h. The PE-material reuse pipeline uses a branch design to deliver clean water to each stage. Flow meters record water consumption in real time, and solenoid valves open and close according to instructions from the intelligent control unit. A water quality safety early warning device continuously monitors the effluent indicators. When the microbial content is detected to be 12 CFU / mL (exceeding the standard threshold), the reuse pipeline is immediately and automatically shut off, while the emergency switching valve is opened to deliver the effluent to the emergency treatment tank. After the fault is resolved and the water quality meets the standards, the reuse pipeline is reconnected to ensure the safety of water used in the hydrogen production process.

[0044] In this embodiment, the intelligent control unit 600 includes: a controller, a sensor network, a water quality prediction model, a membrane fouling early warning model, and a remote monitoring terminal.

[0045] The system includes a controller that links various sensors, flow control valves, and pump actuators to automatically adjust system operating parameters and quickly respond to changes in the operating status of each unit, ensuring that operating parameters remain within the optimal range. A sensor network comprehensively collects water quality, flow rate, pressure, and level data from all stages of wastewater collection, pretreatment, membrane separation, deep purification, and reuse. A water quality prediction model predicts water quality trends and adjusts operating parameters in advance. A membrane fouling early warning model, based on membrane module pressure difference, influent turbidity, and operating time parameters, predicts membrane fouling trends, issues early cleaning warnings, and facilitates timely membrane cleaning. A remote monitoring terminal allows users to view system operating data in real time, receive equipment malfunction or water quality anomaly warnings, and remotely adjust system operating parameters for remote management and maintenance.

[0046] It is understood that the embodiments of this application use a controller to perform full-system automated control, a sensor network to provide comprehensive operational data support, a water quality prediction model and a membrane fouling early warning model to enable early risk prediction and parameter optimization, and a remote monitoring terminal to improve the system's ease of operation and maintenance, enabling the treatment system to operate intelligently and efficiently, and reducing the cost of manual intervention.

[0047] For example, during the operation of a closed-loop water treatment system in a hydrogen production plant, the PLC controller (S7-1500) of the intelligent control unit receives data collected in real time from the sensor network: pH 7.1, COD 1800 mg / L, and flow rate 8 m³ / L from the wastewater collection unit. 3 The pretreatment unit's inclined tube sedimentation tank effluent turbidity was 28 NTU; the nutrient separation and recovery unit's nanofiltration membrane pressure differential was 0.3 MPa, influent turbidity was 25 NTU, and operating time was 12 days; the deep purification unit's effluent COD was 55 mg / L, and microbial content was 0.5 CFU / mL. Based on these real-time data and three months of historical water quality data, a water quality prediction model using an LSTM neural network predicted that the pretreatment unit's effluent COD would rise to 1300 mg / L within the next 2 hours. The controller issued an advance instruction to increase the stirring intensity of the equalization tank (speed increased from 60 r / min to 70 r / min) and fine-tuned the pH adjustment device's dosing ratio to stabilize the subsequent water quality. The membrane fouling early warning model, using a support vector machine algorithm, analyzed the nanofiltration membrane pressure differential, influent turbidity, and operating time data, predicting that the membrane flux would decrease to 70% of its initial value after one day, and sent a cleaning early warning message to the remote monitoring terminal 24 hours in advance. After viewing the warnings through the remote monitoring platform on a computer, staff can remotely issue cleaning commands, and the system will automatically start the online chemical cleaning module. At the same time, the mobile APP pushes system operation data (such as water resource reuse rate of 86% and nutrient salt recovery rate of 91%) and equipment operation status in real time. Staff can remotely adjust the pH adjustment range at any time (such as from 6.5-7.5 to 6.8-7.8) to achieve remote and efficient management of the system.

[0048] This application proposes an integrated system for water treatment and nutrient recovery. The system utilizes a wastewater collection unit to collect and classify wastewater from the entire hydrogen production process and monitor its quality and quantity in real time, providing precise data support for subsequent treatment. A pretreatment unit efficiently removes impurities and stabilizes the water quality and quantity, laying a solid foundation for subsequent treatment. A nutrient separation and recovery unit uses an anti-fouling nanofiltration membrane to precisely separate and enrich ammonia nitrogen, phosphorus, and potassium nutrients with water, enabling resource reuse of nutrients and reducing waste. A deep purification unit combines activated carbon adsorption with ultraviolet disinfection to obtain purified water that meets standards. A clean water reuse unit precisely allocates this purified water to raw material cleaning, fermentation water replenishment, and equipment cleaning processes, maximizing water conservation. An intelligent control unit, relying on a sensor network and a dual prediction model for water quality and membrane fouling, automatically optimizes operating parameters, provides fault warnings, and enables remote control, significantly improving system stability and intelligent operation and maintenance. This solves the problems of low utilization and poor operational stability in existing technologies.

[0049] The following will illustrate an integrated system for water treatment and nutrient recovery through a specific embodiment, such as... Figure 2 As shown, it includes: With a certain 500Nm 3 The application scenario is a biomass hydrogen production plant. This plant uses 30 tons of multi-source organic waste (household waste, tree pellets, and manure) per day as raw materials to produce hydrogen, and the entire process generates an average of 30m³ of fermentation leachate per day. 3 15m³ of steam condensate 3 5m³ of equipment cleaning wastewater 3 Total wastewater volume: 50m³ 3 / d, the wastewater collection and classification ratio is 60% fermentation leachate, 30% steam condensate wastewater, and 10% equipment cleaning wastewater. The wastewater is characterized by high nutrient concentrations (ammonia nitrogen 60-90 mg / L, total phosphorus 12-18 mg / L, total potassium 22-28 mg / L), large fluctuations in suspended solids (200-500 mg / L), and COD concentrations of 500-800 mg / L. Traditional open-loop treatment systems have a water resource reuse rate of only 45%, and water consumption per ton of hydrogen is as high as 18 m³ / ton. 3 Nutrients in the wastewater were not recovered, and the system relied on manual pH adjustment and membrane operating parameter control, resulting in significant fluctuations in effluent COD and a compliance rate of only 85%. To address these issues, this closed-loop integrated water treatment and nutrient recovery system was deployed. The system adopts a modular design, with each unit connected and linked via standardized flanges and 304 stainless steel pipes. The core treatment area occupies 50m². 2 Designed processing capacity 50m 3 / d, the effluent quality must meet the standards for hydrogen production process water (pH 6.0-7.0, COD ≤ 50 mg / L, suspended solids ≤ 5 mg / L, E. coli not detected).

[0050] The wastewater collection unit uses PE-material classified collection pipelines (DN80 diameter), connected to the leachate discharge outlet of the fermentation workshop, the condensate outlet of the steam boiler, and the drainage outlet of the equipment cleaning area. The pipelines are designed with a 2‰ slope to ensure gravity flow. An online water quality and quantity monitoring instrument (model WTWMulti3620) is installed on the main inlet pipe of the main collection tank, monitoring pH, COD, ammonia nitrogen, total phosphorus, total potassium concentrations, and flow rate in real time. The measurement accuracy is ±0.1pH, ±5% (COD), ±0.1mg / L (ammonia nitrogen), ±0.01mg / L (total phosphorus), ±0.1mg / L (total potassium), and ±1% (flow rate), respectively. The data is uploaded to the intelligent control unit via industrial Ethernet. The main collection tank is a reinforced concrete structure with a volume of 100m³. 3 The inner wall is treated with an anti-corrosion coating and equipped with an immersion-type liquid level sensor (measuring range 0-4m, accuracy ±0.01m) and two variable frequency centrifugal pumps (flow rate 20m³ / h). 3The pump operates at a speed of 12m / h with one pump in operation and one in standby mode. When the liquid level reaches 3.2m (80% of the tank capacity), the pump automatically starts and stops when the liquid level drops to 0.8m (20% of the tank capacity). A self-cleaning filter (model HY-XZ-80) with anti-clogging is installed at the outlet of the collection tank. The filter accuracy is 40μm. When the pressure difference between the inlet and outlet is ≥4kPa, the filter automatically backwashes (pressure 0.35MPa, duration 25s). The backwash wastewater is returned to the collection tank to avoid pipeline blockage.

[0051] The mechanical screen (model GSLY-300) of the pretreatment unit has a 5mm gap and a 300mm width. It is installed at the inlet of the pretreatment unit and equipped with a 304 stainless steel chain-type automatic slag removal device. The slag removal scraper is 5mm thick. When the pressure difference between the front and back of the screen reaches 4kPa, the slag removal device automatically starts at a speed of 0.4m / min, conveying the intercepted large impurities such as branches and plastics to a 1m depth. 3 A waste collection tank with a volume of [unspecified volume] is installed, with a cleaning cycle of approximately every 2 hours. Waste is periodically transported off-site for resource recovery and disposal. Behind the mechanical bar screen is an inclined tube sedimentation tank (2.5m × 1.8m × 2.8m), filled with PP honeycomb inclined tubes with a pore size of 50mm. The inclined tubes are inclined at a 60° angle, with an upward flow velocity of 0.4mm / s (range 0.3-0.5mm / s), a hydraulic retention time of 4 hours, and a designed suspended solids removal rate of ≥82% (≥80% standard). The effluent from the inclined tube sedimentation tank enters a regulating tank (5m × 4m × 2.5m, volume 50m³). 3 The tank is equipped with an online water quality monitor (monitoring pH, COD, and turbidity) and an automatic pH adjustment device. It also has two 300L reagent tanks, storing 30% sulfuric acid and 20% sodium hydroxide solutions respectively. These solutions are precisely added via metering pumps to adjust the pH to 6.5 (optimal range of 6.0-7.0). The tank is also equipped with a paddle-type agitator (1m diameter, 18r / min rotation speed, 15-20r / min range) to uniformly mix the water and ensure a stable hydraulic retention time of 10h (8-12h range). This results in uniform effluent quality and quantity, providing stable influent conditions for subsequent nanofiltration membrane separation.

[0052] The nanofiltration membrane unit (model NF90-4040) of the nutrient separation and recovery unit uses 10 antifouling spiral-wound polyamide composite membranes (molecular weight cutoff 200-500 Da), operating in parallel, with an effective area of ​​7.9 m² per membrane element. 2 Operating pressure: 1.2 MPa (optimal value: 1.0-1.5 MPa); operating temperature: 30℃ (optimal value: 25-35℃); ammonia nitrogen rejection rate: ≥88%; total phosphorus rejection rate: ≥81% (meeting standards of ≥85% and ≥78% respectively); divalent ion rejection rate: ≥95%; monovalent ion rejection rate: 40%-60%. The nanofiltration membrane permeate (product water) is sent to the deep purification unit, and the high-concentration nutrient concentrate retained is transported to a 20m... 3The tank is made of 304 stainless steel and equipped with a level gauge (measuring range 0-3m) and a stirring device (30r / min) to ensure uniform concentration of the concentrate (concentration ratio 6 times, total nutrient content ≥12%). A variable frequency screw metering pump (model JXM-A-3) with a flow rate adjustment range of 0.3-3m³ is installed at the tank outlet. 3 / h, according to the production plan of the organic fertilizer preparation workshop, the concentrated liquid delivery rate is precisely controlled, so that the concentrated liquid and organic fertilizer raw materials are mixed and adjusted at a mass ratio of 12% (range of 10%-15%), increasing the total nitrogen, phosphorus and potassium content of the organic fertilizer by ≥2.2 percentage points (≥2 percentage points standard). The nanofiltration membrane device is equipped with an online chemical cleaning module, including two 0.8m... 3 Cleaning solution tanks (containing 0.5% sodium hydroxide + 0.1% sodium hypochlorite alkaline cleaning solution and 0.5% citric acid pickling solution respectively), cleaning pump (flow rate 15m³ / h). 3 / h, head 18m) and valve pipelines, when the membrane flux drops to 70% of the initial value or the pressure difference exceeds 0.3MPa, the cleaning program is automatically started: alkaline cleaning solution circulation cleaning for 60min → clean water rinsing for 30min → acid cleaning solution circulation cleaning for 40min → clean water rinsing for 30min. After cleaning, the membrane flux recovery rate is ≥93%, the membrane fouling rate is reduced by 30%, and the cleaning cycle is extended to 30 days.

[0053] The activated carbon adsorption tower of the deep purification unit (2m×5m, 2m diameter, 5m height) is filled with columnar granular activated carbon (particle size 2-4mm, specific surface area ≥1000m²). 2 / g), filling amount 60kg / m³ 3 (50-80kg / m) 3 The activated carbon adsorption tower has a filling height of 3m, with nanofiltration permeate flowing from top to bottom through the activated carbon layer. The empty tower gas velocity is 0.6m / s (optimal value is 0.5-0.8m / s), and the hydraulic retention time is 30min. The designed COD removal rate is ≥85%, and the organic matter removal rate is ≥90%. The activated carbon adsorption tower is equipped with a hot air regeneration device, including a steam generator (evaporation rate of 30kg / h) and a condensate recovery tank. The regeneration cycle is 18 days (range of 15-20 days). During regeneration, hot air at 130℃ (range of 120-150℃) is introduced for 4 hours. After regeneration, the activated carbon adsorption performance recovery rate is ≥90%, and it can be reused ≥10 times. The regeneration condensate is returned to the total collection tank for repeated treatment. The effluent from the activated carbon adsorption tower enters a UV disinfection device (model ZWX-200). This device is equipped with six low-pressure, high-intensity UV lamps (wavelength 254nm, power 30W), arranged in a single row. The water flow velocity through the UV reaction chamber is 0.4m / s, and the irradiation dose is 35mJ / cm². 2 (30-40mJ / cm) 2(Optimal value), irradiation time 15s, designed E. coli kill rate ≥99.9%. The UV disinfection device is equipped with an automatic scraping device made of polytetrafluoroethylene, which automatically starts every Monday morning and scrapes back and forth along the surface of the lamp tube 3 times to clean the surface dirt, ensuring that the UV transmittance is stable at over 90% to ensure disinfection effect.

[0054] The clean water storage tank of the clean water reuse unit (made of 304 stainless steel, with a volume of 80m³) 3 50-100m 3 The storage tank (4m x 5m x 4m) has its inner wall passivated for corrosion protection to prevent rust from contaminating the water. A constant pressure water supply system is installed at the outlet of the storage tank, consisting of two variable frequency centrifugal pumps (one in operation and one on standby, with a flow rate of 25m³ / h). 3 It consists of a pump with a head of 25m, a pressure sensor (measuring range 0-0.6MPa, accuracy ±0.5%), and a frequency converter control cabinet. Based on the real-time flow requirements for raw material cleaning, fermentation water replenishment, and equipment cleaning, it automatically adjusts the water supply pressure (0.3-0.5MPa) and flow rate (adjustment accuracy ±0.1m) to meet these requirements. 3 / h). The reuse pipeline is made of PE material (DN70 diameter) and has 3 branch pipelines to deliver water to each water-using point. The branch pipelines are equipped with electromagnetic flow meters (measuring range 0-30m). 3 The system uses electric ball valves (with an accuracy of ±1%) to precisely allocate water according to the ratio of "40% for raw material cleaning, 50% for fermentation water replenishment, and 10% for equipment cleaning," matching the water requirements of the hydrogen production process. The clean water reuse unit is equipped with a water quality safety early warning device (model WTWIQSensorNet) to monitor effluent pH (6.0-7.0), COD (≤50mg / L), suspended solids (≤5mg / L), and microbial content in real time. When any indicator exceeds the standard, an audible and visual alarm is immediately triggered, and the electric ball valve on the reuse pipeline is automatically shut off. An emergency switching valve is then opened to deliver the effluent to a 10m... 3 The emergency treatment pool will be reconnected to the reuse pipeline after the fault is resolved and the water quality is retested and meets the standards.

[0055] The intelligent control unit uses a PLC controller (model S7-1200) as its core, communicating with sensors, pumps, valves, metering pumps, and other actuators in each unit via a PROFIBUS bus. It automatically adjusts system operating parameters with a response time of ≤5s. The sensor network covers the entire process, including a pH sensor (accuracy ±0.1pH), a COD sensor (range 0-1000mg / L, accuracy ±5%), and a flow sensor (range 0-50m). 3The system includes sensors such as pressure sensors (range 0-2MPa, accuracy ±1%), level sensors, turbidity sensors (range 0-200NTU, accuracy ±2%), and microbial sensors, with a data sampling frequency of once per minute throughout the entire process. The water quality prediction model, built on an LSTM neural network and deployed in a PLC extension module, inputs historical water quality data and real-time operating parameters to predict wastewater quality trends over the next 24 hours with an accuracy ≥90%, allowing for advance adjustments to parameters such as chemical dosage and stirring intensity. The membrane fouling early warning model uses a support vector machine algorithm, based on parameters such as membrane module pressure difference, influent turbidity, and operating time, to issue membrane cleaning warnings 24 hours in advance. The remote monitoring terminal, built on an industrial internet platform, supports access via computer web interface and Android / iOS mobile app. Users can view real-time data on treated water volume, effluent quality, nutrient recovery rate, and water reuse rate, receive equipment fault or water quality anomaly warnings, and remotely set pH adjustment ranges, start / stop cleaning programs, and adjust water supply pressure for remote system management and maintenance.

[0056] Actual operating data from three months of continuous system operation shows that the average daily treatment capacity of hydrogen production wastewater is 50m³. 3 The water reuse rate reached 92% (≥90% standard), with an average daily reuse of 46m³ of clean water. 3 The water consumption per ton of hydrogen is reduced to 2.5m³. 3 Compared to traditional systems, this reduces costs by 85% and saves 80% on fresh water costs; nutrient recovery efficiency is stable, with ammonia nitrogen recovery rate of 88% and total phosphorus recovery rate of 81%, and an average daily recovery of 1.5m³ of nutrient concentrate. 3 The system produces 20 tons of high-quality organic fertilizer, reducing the cost of organic fertilizer raw materials by 15%. The average COD of the effluent is 42 mg / L, suspended solids are 3 mg / L, and E. coli is not detected. All indicators meet the water standards for hydrogen production processes, and the effluent compliance rate is stable at 99.8%. Through intelligent control and automatic operation and maintenance, labor costs are reduced by 70%, operating energy consumption is reduced by 25% compared with traditional treatment systems, and the service life of membrane modules is extended by 35%. It achieves multiple goals of zero wastewater discharge, efficient resource recovery, and energy conservation and consumption reduction, and has significant environmental, economic and social benefits.

[0057] In summary, the embodiments of this application, through modular splicing and multi-unit collaborative operation, combined with high-precision monitoring throughout the entire process, anti-fouling nanofiltration membrane nutrient separation, deep purification through activated carbon regeneration and ultraviolet disinfection, and intelligent and precise regulation supported by PLC control and dual prediction models, achieve zero-discharge closed-loop reuse of biomass hydrogen production wastewater and efficient resource recovery of ammonia nitrogen, phosphorus, and potassium nutrients. The water resource reuse rate and nutrient recovery rate are significantly improved, and the effluent compliance rate and system operation stability are significantly enhanced. This effectively solves the pain points of traditional open-loop treatment such as high water consumption, resource waste, reliance on manual operation, and effluent fluctuations, providing efficient and feasible technical support for energy conservation, environmental protection, and resource recycling in the biomass hydrogen production industry.

[0058] Next, referring to the accompanying drawings, an integrated method for water treatment and nutrient recovery according to an embodiment of this application is described.

[0059] like Figure 3 As shown, this integrated method for water treatment and nutrient recovery includes the following steps: In step S101, wastewater from the entire hydrogen production process is obtained.

[0060] It is understood that the embodiments of this application achieve centralized management of wastewater by classifying and collecting various types of wastewater generated throughout the hydrogen production process, such as fermentation leachate, steam condensate, and equipment cleaning wastewater. This provides a foundation for subsequent treatment and resource recovery, while avoiding the increased treatment difficulty caused by mixing different types of wastewater and ensuring the stable operation of subsequent treatment units.

[0061] In step S102, the wastewater from the entire hydrogen production process is treated. The wastewater pH value, chemical oxygen demand, ammonia nitrogen, total phosphorus, total potassium concentration and flow rate are monitored in real time. Coarse impurities are removed by mechanical bar screens, suspended solids are separated by honeycomb inclined tube sedimentation tanks, and the pH value of the water is adjusted to a suitable range by an automatic pH adjustment device in the equalization tank to obtain stable wastewater.

[0062] Among them, the automatic pH adjustment device refers to an automated device used in water treatment and other processes, which uses data from online pH monitoring components to automatically adjust the dosage of acid and alkali dosing components by the control unit, thereby stabilizing the pH value of the system within a preset suitable range.

[0063] It is understood that the embodiments of this application utilize an automatic pH adjustment device to receive online pH monitoring data in real time and automatically adjust the amount of acid and alkali added. Through precise addition, the pH value of wastewater is stably controlled, and the pH value of the water is adjusted to a suitable range, providing stable influent conditions for subsequent nanofiltration membrane separation and other processes. At the same time, it solves the problems of low efficiency, large error and pH value fluctuation of manual adjustment, improves the automation and precision of wastewater pretreatment, and directly ensures the stability of the pretreated wastewater quality.

[0064] For example, in the resource utilization process of wastewater from the Texaco coal-to-hydrogen production process, an automatic pH adjustment device can capture real-time pH data of the wastewater in the MAP reaction sedimentation tank and anaerobic treatment unit. This data is then linked to the dosing system to automatically adjust the acid and alkali dosage. Precise dosing achieves stable pH control, enabling efficient removal of NH4 by the MAP precipitation method. + -N、Ca 2+ Plasma provides a suitable reaction environment, while solving the problems of delayed response from manual adjustment, waste of reagents, and instability of biochemical systems caused by pH fluctuations. It improves the automation and precision of wastewater pretreatment, directly ensuring the stable progress of subsequent biochemical treatment and deep reuse processes, and laying a solid foundation for the standard discharge and resource recovery of hydrogen production wastewater.

[0065] In step S103, based on the wastewater in a stable state, ammonia nitrogen, phosphorus, potassium nutrients and water in the wastewater are separated by nanofiltration membrane, and the concentrated nutrient solution is enriched and transported to the organic fertilizer preparation workshop to meet the conditioning requirements of organic fertilizer. At the same time, the nanofiltration permeate is collected and subjected to adsorption, impurity removal and disinfection treatment to obtain purified water that meets the standards.

[0066] Nanofiltration membranes are a type of membrane separation material that lies between ultrafiltration and reverse osmosis. They can retain small organic molecules and divalent or higher salts such as ammonia nitrogen, phosphorus, and potassium, while allowing monovalent salts and water to pass through. They are suitable for water treatment, nutrient separation and recovery, and other applications.

[0067] It is understood that the embodiments of this application utilize nanofiltration membranes, based on the unique separation performance between ultrafiltration and reverse osmosis, to precisely retain ammonia nitrogen, phosphorus, potassium nutrients and small molecule organic matter in stable wastewater, efficiently enrich concentrated nutrient solution that meets the conditioning requirements of organic fertilizer, and simultaneously collect low-pollution pure nanofiltration permeate, providing high-quality influent conditions for subsequent adsorption and disinfection treatment, ensuring a stable output of compliant clean water, effectively solving the pain points of insufficient nutrient recovery and low water resource utilization in traditional hydrogen production wastewater treatment, and continuously improving the efficiency of resource recovery and the reliability of reclaimed water quality.

[0068] In step S104, qualified clean water is delivered to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages. The water supply pressure and flow rate are adjusted by a constant pressure water supply device. At the same time, the operating parameters of the water use stages are monitored in real time, and the operating conditions are automatically optimized and adjusted.

[0069] Among them, constant pressure water supply device refers to equipment that automatically adjusts water supply pressure and flow rate to maintain constant pressure and ensure stable water supply in water use scenarios such as hydrogen production process reuse and water treatment through pressure monitoring and frequency conversion control or pump group coordinated regulation.

[0070] It is understood that the embodiments of this application utilize a constant pressure water supply device, which, through pressure monitoring and frequency conversion control (or pump group coordinated regulation), provides precise pressure and flow regulation capabilities. This not only ensures the stable delivery of qualified clean water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages, but also adapts to water demand in real time to maintain a constant water supply pressure. This provides reliable flow and pressure data support for the automatic optimization and adjustment of operating parameters based on water usage stages. At the same time, when water load fluctuates, the device's dynamic regulation capability provides efficient adaptation and guarantee for precise water allocation and balanced water use. This effectively solves the problems of large fluctuations in traditional water supply pressure, uneven flow distribution, and lag in manual adjustment, which lead to unstable process water use and water waste.

[0071] For example, at a certain 500 Nm 3 In the wastewater closed-loop treatment project of the / h water electrolysis hydrogen production plant, the treated water that meets the standards is temporarily stored in a clean water storage tank. Then, a constant pressure water supply device integrating a variable frequency centrifugal pump, pressure transmitter, and intelligent variable frequency controller is used to precisely respond to the differentiated water needs of multiple stages of the hydrogen production process, specifically addressing the 25m³ raw material cleaning stage. 3 Water parameters of / h and 0.25MPa, 15m of cooling water replenishment for electrolytic cell. 3 The pressure and flow requirements are 0.35 MPa / h, and the equipment cleaning and reuse process requires 10m. 3 With an adaptation standard of 0.3MPa / h, the device dynamically adjusts the pump operating frequency (range 20-50Hz) by collecting real-time pressure and flow data from each pipeline, achieving millisecond-level response and precise matching of water supply parameters; when the flow rate drops to 14m³ / h due to pipeline pressure fluctuations in the electrolytic cell cooling water replenishment stage... 3 When the flow rate reaches a certain value per hour, the pressure transmitter immediately feeds back the data, and the frequency converter quickly adjusts the pump output power, restoring the flow rate to the set value within 10 seconds. This effectively avoids interruptions in process water supply or unstable water quality caused by pressure fluctuations. At the same time, the constant pressure output characteristic of the device eliminates the uneven flow distribution and water waste that occur in traditional water supply modes. Combined with the linkage mechanism of the intelligent control unit, it ensures that the water reuse rate remains stable at over 80%, providing reliable water supply support for the continuous and efficient operation of the hydrogen production process, the stable heat dissipation of the electrolyzer cooling system, and the cleanliness requirements for equipment cleaning. This significantly improves the operational efficiency of the entire closed-loop water treatment system and the energy-saving and consumption-reducing level of the hydrogen production plant.

[0072] According to the embodiments of this application, an integrated method for water treatment and nutrient recovery is proposed. The wastewater collection unit enables the classified collection and real-time monitoring of wastewater from the entire hydrogen production process, providing precise data support for subsequent treatment. The pretreatment unit efficiently removes impurities and adjusts the water quality and quantity to a stable state, laying a solid foundation for subsequent treatment. The nutrient separation and recovery unit uses an anti-fouling nanofiltration membrane to precisely separate and enrich ammonia nitrogen, phosphorus, potassium nutrients, and water, achieving resource reuse of nutrients and reducing resource waste. The deep purification unit uses activated carbon adsorption combined with ultraviolet disinfection to obtain purified water that meets standards. The clean water reuse unit precisely allocates the purified water to raw material cleaning, fermentation water replenishment, and equipment cleaning stages, maximizing water resource conservation. The intelligent control unit relies on a sensor network and a dual prediction model for water quality and membrane fouling to achieve automatic optimization of operating parameters, fault warning, and remote control, significantly improving system operational stability and intelligent operation and maintenance levels. This solves the problems of low utilization rate and poor operational stability in existing technologies.

[0073] The following will illustrate an integrated method for water treatment and nutrient recovery through a specific embodiment, such as... Figure 4 As shown, it includes: With a certain 500Nm 3 The wastewater treatment and resource recycling project of the / h biomass hydrogen production plant serves as an application scenario. This plant uses a daily processing capacity of 30 tons of multi-source organic waste (a mixture of municipal solid waste, tree pellets, and manure in a 4:3:3 ratio) as raw material to produce hydrogen through an anaerobic fermentation process. The entire process generates an average of 30m³ of fermentation leachate per day. 3 15m³ of steam condensate 3 5m³ of equipment cleaning wastewater 3 Total wastewater volume: 50m³ 3 / d. The wastewater is characterized by high nutrient concentration, large fluctuations in suspended solids, and uneven organic matter content. The main pollutant indicators are: suspended solids 200-500 mg / L, COD 500-800 mg / L, ammonia nitrogen 60-90 mg / L, total phosphorus 12-18 mg / L, total potassium 22-28 mg / L, and pH 6.5-7.5. The project aims to achieve closed-loop wastewater treatment, with a water resource reuse rate ≥90%, ammonia nitrogen recovery rate ≥85%, and total phosphorus recovery rate ≥78%. The effluent should meet the requirements of pH 6.0-7.0, COD ≤50 mg / L, suspended solids ≤5 mg / L, and E. coli not detected. At the same time, it aims to reduce the consumption of fresh water in the hydrogen production process and the cost of organic fertilizer raw materials.

[0074] First, the wastewater collection system is activated, using three sets of PE material classified collection pipelines (DN80 diameter, 10mm wall thickness, with a 2‰ slope to ensure gravity flow). These pipelines are connected to the leachate discharge outlet of the fermentation workshop, the condensate outlet of the steam boiler, and the drain outlet of the equipment cleaning area, respectively. The wastewater is transported to a 15m high-temperature storage area in a ratio of 60% fermentation leachate, 30% steam condensate wastewater, and 10% equipment cleaning wastewater. 3 A reinforced concrete main collection tank (with an epoxy resin anti-corrosion coating on the inner wall, dimensions 3m × 2.5m × 2m). A self-cleaning filter (model HY-XZ-80, filtration accuracy 40μm) is installed at the collection tank outlet. When the inlet-outlet pressure difference ≥ 4kPa, an automatic backwashing procedure is initiated (backwashing pressure 0.35MPa, duration 25s, backwash wastewater returns to the collection tank) to prevent pipe blockage. An online water quality and quantity monitoring instrument (model WTWMulti3620) is installed on the main inlet pipe of the main collection tank to monitor three wastewater parameters in real time: fermentation leachate pH 6.8, COD 720mg / L, ammonia nitrogen 82mg / L, total phosphorus 16mg / L, total potassium 26mg / L, suspended solids 420mg / L, flow rate 1.25m³ / h. 3 / h; Steam condensate residue pH 7.1, COD 120 mg / L, ammonia nitrogen 65 mg / L, total phosphorus 13 mg / L, total potassium 23 mg / L, suspended solids 80 mg / L, flow rate 0.625 m³ / h. 3 / h; Equipment cleaning wastewater pH 7.3, COD 280mg / L, ammonia nitrogen 70mg / L, total phosphorus 14mg / L, total potassium 25mg / L, suspended solids 150mg / L, flow rate 0.208m³ / h. 3 The monitoring data is uploaded to the intelligent control unit in real time via Profibus industrial Ethernet at a sampling frequency of 1 time per minute. The measurement accuracies are ±0.1 pH, ±5% (COD), ±0.1 mg / L (ammonia nitrogen), ±0.01 mg / L (total phosphorus), ±0.1 mg / L (total potassium), and ±1% (flow rate). When the submersible level sensor (measuring range 0-4m, accuracy ±0.01m) in the total collection tank detects a liquid level of 3.2m (tank volume 80%), two variable frequency centrifugal pumps (model ISG50-160, flow rate 20m³ / h) are activated. 3 The pump automatically starts (with a capacity of 12m and one pump in operation and one in standby) and smoothly transports the mixed wastewater to the pretreatment unit. When the liquid level drops to 0.8m (20% of the tank volume), the pump stops operating to ensure a continuous and stable collection process.

[0075] After entering the pretreatment unit, the mixed wastewater first flows through a 5mm gap mechanical screen (model GSLY-300, 300mm wide, made of 304 stainless steel) to remove coarse impurities such as branches, plastic fragments, and fibers. When the differential pressure sensor before and after the screen detects a pressure difference of 4kPa, the chain-type automatic slag removal device (5mm thick slag scraper, made of 304 stainless steel) automatically starts at a speed of 0.4m / min, conveying the intercepted waste slag to a 1m... 3 The waste residue collection tank has a cleaning cycle of approximately every 2 hours. The collected waste residue is periodically transported off-site for resource-based incineration. Subsequently, the wastewater enters an inclined tube sedimentation tank (dimensions 2.5m × 1.8m × 2.8m, effective volume 12.6m³). 3 The sedimentation tank is filled with PP honeycomb inclined tubes with a pore size of 50mm and an inclination angle of 60°. The upward flow velocity is 0.4mm / s, and the hydraulic retention time is 4 hours. Suspended solids are efficiently separated through gravity sedimentation. Monitoring showed that the suspended solids in the effluent decreased to 76mg / L, achieving a removal rate of 82%. The supernatant from the sedimentation tank flows into a 22.5m... 3 The equalization tank (3m × 2.5m × 3m) is equipped with an online water quality monitor that continuously monitors the influent pH (6.9), COD (450mg / L), and turbidity (120NTU). Based on the monitoring data, the intelligent control unit issues commands, and the automatic pH adjustment device (equipped with two 300L PE reagent tanks, storing 30% sulfuric acid and 20% sodium hydroxide solutions respectively) precisely adds 30% sulfuric acid solution at a rate of approximately 1.2L / h via a metering pump (flow rate adjustable from 0-50L / h, accuracy ±1%). The pH of the wastewater in the tank was precisely adjusted to 6.5. At the same time, a paddle-type agitator (1m diameter, fiberglass, 18r / min speed) was started to uniformly mix the water in the tank, avoid uneven concentration in some areas, and ensure that the hydraulic retention time was kept stable at 10h. The final result was pre-treated effluent with stable water quality, with the following parameters: pH 6.5±0.2, COD 430mg / L, suspended solids 70mg / L, ammonia nitrogen 75mg / L, and total phosphorus 14.5mg / L. This provides excellent influent conditions for subsequent nanofiltration membrane separation.

[0076] The pretreated effluent is then pumped by a high-pressure pump (model CDL8-12, head 150m, flow rate 8m³ / h). 3 After being pressurized to 1.2 MPa (per hour), the solution is pumped into the nutrient separation and recovery unit. This unit's nanofiltration membrane unit (model NF90-4040) uses four antifouling spiral-wound polyamide composite membranes (membrane fibers with a molecular weight cutoff of 200-500 Da, and an effective area of ​​7.9 m² per membrane element). 2The system is divided into two groups operating in parallel, operating under optimal process conditions of 30℃ and influent pH 6.5. The nanofiltration membrane has a rejection rate of ≥95% for divalent ions and 40%-60% for monovalent ions, with a rejection rate of 88% for ammonia nitrogen, 81% for total phosphorus, and 90% for total potassium, efficiently separating nutrients from water. The retained high-concentration nutrients form a concentrated solution (concentration factor 6 times, total nutrient content 12%, including 66 mg / L ammonia nitrogen, 11.7 mg / L total phosphorus, and 22.5 mg / L total potassium), which is transported to a 5m depth via 304 stainless steel pipeline. 3 A concentrated liquid storage tank (made of 304 stainless steel, dimensions 2m × 1.6m, equipped with a level gauge (measuring range 0-3m) and a stirring device (speed 30r / min) to ensure uniform concentration of the concentrated liquid). The concentrate is then metered by a variable frequency screw metering pump (model JXM-A-3, flow rate adjustable range 0.3-3m). 3 / h, accuracy ±0.5%) based on 1.2m 3 The flow rate is precisely delivered according to the production plan of the organic fertilizer preparation workshop, and mixed and conditioned with organic fertilizer raw materials at a mass ratio of 12%, which can increase the total nitrogen, phosphorus and potassium content of organic fertilizer by 2.2 percentage points. Nanofiltration permeate (COD 68 mg / L, suspended solids 8 mg / L, ammonia nitrogen 9.8 mg / L, total phosphorus 2.8 mg / L, pH 6.4) enters the deep purification unit, first flowing through an activated carbon adsorption tower (1.8m × 1.8m × 4.5m, made of carbon steel lined with rubber). The tower is filled with columnar granular activated carbon (particle size 2-4mm, specific surface area ≥1000m²). 2 / g, filling amount 60kg / m³ 3 Nanofiltration permeate flows from top to bottom through an activated carbon layer with an empty tower gas velocity of 0.6 m / s and a hydraulic retention time of 30 min. This process efficiently adsorbs residual organic matter, odors, and some trace pollutants. Monitoring showed that the effluent COD decreased to 42 mg / L, and the organic matter removal rate reached 90%. The permeate then enters a UV disinfection unit (model ZWX-200), equipped with six low-pressure, high-intensity UV lamps (wavelength 254 nm, power 30 W, arranged in a single row). The water flow velocity through the UV reaction chamber is 0.4 m / s, and the irradiation dose is 35 mJ / cm². 2 The irradiation time is 15 seconds, which effectively kills microorganisms such as E. coli. At the same time, the device is equipped with an automatic sludge scraping device made of polytetrafluoroethylene, which automatically starts every Monday morning and scrapes the surface of the lamp tube three times to clean the surface dirt, ensuring that the ultraviolet light transmittance is stable at over 90%, and finally obtaining clean water with pH 6.2-6.8, COD≤45mg / L, suspended solids≤3mg / L, and no detected E. coli.

[0077] Standard clean water is stored at 8m 3Stainless steel clean water storage tank (material: 304 stainless steel, dimensions: 2m×2m×2m, inner wall passivated for corrosion prevention to prevent rust and water contamination). A constant pressure water supply device is installed at the tank outlet, consisting of two variable frequency centrifugal pumps (model ISG65-125, one in operation and one on standby, flow rate 25m³ / h). 3 It consists of a pump with a head of 25m, a pressure sensor (measuring range 0-0.6MPa, accuracy ±0.5%), and a frequency converter control cabinet. Based on the real-time flow requirements of each water-using stage in the hydrogen production process, it automatically adjusts the water supply pressure (0.3-0.5MPa) and flow rate (adjustment accuracy ±0.1m) to meet the specific water usage requirements. 3 / h). The reuse pipeline is made of PE material (DN70 diameter, pressure rating 1.0MPa), and is equipped with 3 branch pipelines to deliver water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages respectively. Each branch pipeline is equipped with an electromagnetic flow meter (measuring range 0-30m). 3 / h (accuracy ±1%) and electric ball valves are used to precisely allocate water according to the ratio of "40% for raw material cleaning, 50% for fermentation water replenishment, and 10% for equipment cleaning," with the raw material cleaning stage requiring 0.833m³ of water. 3 / h, water supply pressure 0.3MPa, water requirement for fermentation replenishment stage 1.042m³ 3 / h, water supply pressure 0.4MPa, water requirement for equipment cleaning and reuse 0.208m³ / h. 3 The water supply pressure is 0.5 MPa per hour. The clean water reuse unit is also equipped with a water quality safety early warning device (model WTWIQSensorNet) to monitor the pH, COD, suspended solids, and microbial content of the effluent in real time. If any indicator exceeds the standard, an audible and visual alarm will be triggered immediately, and the electric ball valve of the reuse pipeline will be automatically shut off, while the emergency switching valve will be opened to deliver the effluent to a 10m... 3 The emergency treatment pool will be reconnected to the reuse pipeline after the fault is resolved and the water quality is retested and meets the standards.

[0078] The intelligent control unit is based on a PLC controller (model S7-1200, equipped with AI / AO expansion module SM1234). It communicates with sensors, pumps, valves, metering pumps, and other actuators in each unit via a PROFIBUS bus, automatically adjusting system operating parameters with a system response time ≤5s. The sensor network covers the entire process, including a pH sensor (accuracy ±0.1pH), a COD sensor (range 0-1000mg / L, accuracy ±5%), and a flow sensor (range 0-50m). 3The system includes sensors such as a flow rate sensor (0-2MPa, accuracy ±1%), a pressure sensor (0-2MPa, accuracy ±0.5%), a level sensor, a turbidity sensor (0-200NTU, accuracy ±2%), and a microbial sensor. All data is collected in real-time and stored on a local server. The water quality prediction model is built on an LSTM neural network, implemented using Python programming and deployed on a PLC extension module. Inputting nearly 30 days of historical water quality data and real-time operating parameters (flow rate, pH, COD), it predicts the wastewater quality trend for the next 24 hours with an accuracy ≥90%. When the predicted influent COD is expected to rise to 550mg / L, the nanofiltration membrane operating pressure is adjusted to 1.3MPa in advance to ensure stable product water quality. The membrane fouling early warning model employs a support vector machine algorithm, built upon parameters such as membrane module differential pressure, influent turbidity, and operating time. It issues a membrane cleaning warning 24 hours in advance. After 15 days of system operation, when the membrane module differential pressure rises to 0.28 MPa, the model predicts that membrane flux will decrease to 70% of its initial value, immediately initiating an online chemical cleaning procedure: first, 60 minutes of cyclic cleaning with a mixed alkaline solution of 0.5% sodium hydroxide and 0.1% sodium hypochlorite, followed by 30 minutes of rinsing with clean water; then, 40 minutes of cyclic cleaning with a 0.5% citric acid solution; and finally, 30 minutes of rinsing with clean water. The membrane flux recovery rate after cleaning reaches 93%. The remote monitoring terminal is built on an industrial internet platform, supporting access via a computer web interface (accessible through a Chrome browser) and an Android / iOS mobile app. Users can view real-time data such as treated water volume, effluent quality, nutrient recovery rate, and water reuse rate, receive equipment fault or water quality anomaly warnings, and remotely set pH adjustment ranges, start / stop cleaning programs, and adjust water supply pressure, enabling remote system management and maintenance.

[0079] Actual operating data from three months of continuous system operation shows that the average daily treatment capacity of hydrogen production wastewater is 50m³. 3 The water reuse rate reached 92%, with an average daily reuse rate of 46 cubic meters of clean water. 3 The water consumption per ton of hydrogen is reduced from 18m³ in traditional systems. 3 Reduced to 2.5m 3 Compared to traditional systems, this reduces costs by 85% and saves 80% on fresh water costs; nutrient recovery efficiency is stable, with ammonia nitrogen recovery rate of 88% and total phosphorus recovery rate of 81%, and an average daily recovery of 1.5m³ of nutrient concentrate. 3The system produces 20 tons of high-quality organic fertilizer, reducing the cost of organic fertilizer raw materials by 15%. The effluent has an average COD of 42 mg / L, suspended solids of 3 mg / L, and pH of around 6.5. E. coli was not detected, and all indicators meet the requirements for reuse. Through intelligent control and automatic operation and maintenance, labor costs are reduced by 70%, and operating energy consumption is reduced by 25% compared to traditional treatment systems. The membrane module cleaning cycle is extended to 30 days, and the service life is extended by 35%. After regeneration of activated carbon with 130℃ hot air (regeneration cycle of 18 days, regeneration time of 4 hours), the adsorption performance recovery rate is ≥90%, and it can be reused ≥10 times. This system achieves multiple goals of zero wastewater discharge, efficient resource recovery, and energy conservation and consumption reduction, and has significant environmental, economic, and social benefits.

[0080] In summary, this application embodiment achieves precise control and real-time acquisition of multi-dimensional water quality and flow data for the entire hydrogen production wastewater process by constructing an integrated wastewater collection system that combines classified collection and online monitoring. The pretreatment process, combining mechanical bar screens, inclined tube sedimentation tanks, and automatic pH adjustment devices, achieves stable optimization of water quality and quantity. Further deep purification, using a nanofiltration membrane separation and recovery unit combined with activated carbon adsorption and ultraviolet disinfection, achieves efficient nutrient recovery and deep water purification. The precise water distribution from a constant pressure water supply device and the model-based early warning and dynamic parameter adjustment from an intelligent control unit effectively ensure the closed-loop treatment of hydrogen production wastewater and the goal of nutrient resource utilization. The effluent pH, COD, suspended solids, and microbial indicators fully meet reuse requirements, significantly improving water resource recycling rate and nutrient resource utilization level.

[0081] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 501, the processor 502, and the computer program stored on the memory 501 and capable of running on the processor 502.

[0082] When the processor 502 executes the program, it implements an integrated method for water treatment and nutrient recovery provided in the above embodiments.

[0083] Furthermore, electronic devices also include: Communication interface 503 is used for communication between memory 501 and processor 502.

[0084] The memory 501 is used to store computer programs that can run on the processor 502.

[0085] The memory 501 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0086] If the memory 501, processor 502, and communication interface 503 are implemented independently, then the communication interface 503, memory 501, and processor 502 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0087] Optionally, in a specific implementation, if the memory 501, processor 502, and communication interface 503 are integrated on a single chip, then the memory 501, processor 502, and communication interface 503 can communicate with each other through an internal interface.

[0088] The processor 502 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of this application.

[0089] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described integrated method for water treatment and nutrient recovery.

[0090] In the description of this specification, the references to "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0093] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0094] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware, and the program can be stored in a computer-readable storage medium. When executed, the program includes one or a combination of the steps of the method embodiments.

[0095] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An integrated system for water treatment and nutrient recovery, characterized in that, include: The system comprises a wastewater collection unit, a pretreatment unit, a nutrient separation and recovery unit, a deep purification unit, a clean water reuse unit, and an intelligent control unit. The wastewater collection unit is connected to the pretreatment unit, which is connected to the nutrient separation and recovery unit, which is connected to the deep purification unit, which is connected to the clean water reuse unit. The intelligent control unit operates in conjunction with each of the other units. The wastewater collection unit is used to collect wastewater from the entire hydrogen production process in a classified manner and to monitor water quality, quantity and flow rate in real time. The pretreatment unit is used to remove suspended solids and coarse impurities from wastewater through a screen and sedimentation tank, adjust the water quality and quantity to a stable state through an equalization tank, and control the pH value. The nutrient separation and recovery unit is used to separate ammonia nitrogen, phosphorus, potassium nutrients and water through nanofiltration membrane, enrich concentrated nutrient solution, and quantitatively deliver the concentrated nutrient solution to the organic fertilizer workshop. The deep purification unit is used to adsorb impurities and disinfect nanofiltration permeate to obtain purified water that meets the standards. The clean water reuse unit is used to transport the qualified clean water to the raw material cleaning, fermentation water replenishment and equipment cleaning stages for water resource reuse. The intelligent control unit is used to monitor the operating parameters of the water use process in real time, and automatically optimizes and adjusts the operating conditions based on the linkage between the PLC controller, water quality sensor and actuator.

2. The integrated system for water treatment and nutrient recovery according to claim 1, characterized in that, The wastewater collection unit includes separate collection pipelines, an online water quality and quantity monitoring instrument, and a main collection tank. The separate collection pipelines collect fermentation leachate, steam condensate, and equipment cleaning wastewater, respectively. The online water quality and quantity monitoring instrument is used to monitor the wastewater pH, chemical oxygen demand, ammonia nitrogen, total phosphorus, total potassium concentration, and wastewater flow rate in real time. The main collection tank is used to collect wastewater and is equipped with a level sensor to automatically start and stop the drainage pump.

3. The integrated system for water treatment and nutrient recovery according to claim 1, characterized in that, The pretreatment unit includes a mechanical bar screen, an inclined tube sedimentation tank, and an equalization tank. The mechanical bar screen is used to remove large impurities such as branches and plastics from the wastewater. The inclined tube sedimentation tank uses honeycomb inclined tubes to remove suspended solids through sedimentation. The equalization tank is equipped with an automatic pH adjustment device and an online water quality monitor to monitor multiple water quality indicators in real time. The pH is adjusted to a suitable range by adding acid and alkali reagents, and the water in the tank is uniformly mixed using a stirring device to ensure a stable hydraulic retention time.

4. The integrated system for water treatment and nutrient recovery according to claim 1, characterized in that, The nutrient separation and recovery unit includes a nanofiltration membrane device, a concentrate storage tank, a metering pump, and an online chemical cleaning module. The nanofiltration membrane device uses an anti-fouling spiral-wound composite membrane to separate nutrients from water. The concentrate storage tank stores the high-concentration nutrient concentrate enriched by membrane separation. The metering pump precisely controls the amount of concentrate delivered to the organic fertilizer preparation workshop, ensuring the concentrate addition ratio meets the conditioning requirements of organic fertilizer. The online chemical cleaning module uses alternating cleaning with specific chemical agents to specifically remove contaminants adhering to the membrane surface, quickly restoring membrane flux and maintaining membrane separation efficiency.

5. The integrated system for water treatment and nutrient recovery according to claim 1, characterized in that, The deep purification unit includes an activated carbon adsorption tower and an ultraviolet disinfection device. The activated carbon adsorption tower is equipped with an online regeneration device to adsorb residual organic matter, odors, and some trace pollutants in the nanofiltration product water. After the adsorption performance of the activated carbon decreases, its adsorption capacity is restored through thermal regeneration, and the activated carbon can be reused. The ultraviolet disinfection device uses low-pressure, high-intensity ultraviolet lamps to efficiently kill E. coli microorganisms in the wastewater. The surface of the lamps is cleaned regularly to obtain purified water that meets the standards.

6. The integrated system for water treatment and nutrient recovery according to claim 1, characterized in that, The clean water reuse unit includes a clean water storage tank, a constant pressure water supply device, a reuse pipeline, and a water quality safety early warning device. The clean water storage tank prevents corrosion of the inner wall of the tank from contaminating the clean water, ensuring the safety of the reused water quality. The constant pressure water supply device automatically adjusts the water supply pressure and flow rate according to the real-time flow demand of each water usage stage. The reuse pipeline precisely distributes water to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages. The water quality safety early warning device monitors the effluent water quality in real time; when the effluent water quality is detected to be substandard, it automatically cuts off the reuse pipeline and switches the effluent to the emergency treatment tank.

7. The integrated system for water treatment and nutrient recovery according to claim 1, characterized in that, The intelligent control unit includes a controller, a sensor network, a water quality prediction model, a membrane fouling early warning model, and a remote monitoring terminal. The controller is used to coordinate various sensors, flow control valves, and pump actuators to automatically adjust system operating parameters and quickly respond to changes in the operating status of each unit, ensuring that operating parameters are within the optimal range. The sensor network comprehensively collects water quality, flow rate, pressure, and liquid level operating data at each stage of wastewater collection, pretreatment, membrane separation, deep purification, and reuse. The water quality prediction model predicts water quality change trends and adjusts operating parameters in advance. The membrane fouling early warning model predicts membrane fouling trends based on membrane module pressure difference, influent turbidity, and operating time parameters, issuing early cleaning warnings and promptly carrying out membrane cleaning. The remote monitoring terminal allows users to view system operating data in real time, receive equipment fault or water quality anomaly warnings, and remotely adjust system operating parameters for remote management and maintenance.

8. An integrated method for water treatment and nutrient recovery, characterized in that, include: Obtain wastewater from the entire hydrogen production process; The wastewater from the entire hydrogen production process is treated by real-time monitoring of wastewater pH, chemical oxygen demand, ammonia nitrogen, total phosphorus, total potassium concentration and flow rate. Large impurities are removed by mechanical bar screens, suspended solids are separated by honeycomb inclined tube sedimentation tanks, and the pH value of the water is adjusted to a suitable range in the equalization tank by an automatic pH adjustment device to obtain stable wastewater. Based on the wastewater in the stable state, ammonia nitrogen, phosphorus, potassium nutrients and water in the wastewater are separated by nanofiltration membrane, and concentrated nutrient solution is enriched and transported to the organic fertilizer preparation workshop to meet the conditioning requirements of organic fertilizer. At the same time, nanofiltration permeate is collected and subjected to adsorption, impurity removal and disinfection treatment to obtain purified water that meets the standards. The qualified clean water is delivered to the raw material cleaning, fermentation water replenishment, and equipment cleaning stages. The water supply pressure and flow rate are regulated by a constant pressure water supply device. At the same time, the operating parameters of the water use stages are monitored in real time, and the operating conditions are automatically optimized and adjusted.

9. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, the processor executing the program to implement the integrated method for water treatment and nutrient recovery as described in claim 8.

10. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When a computer program or instruction is executed, it implements the integrated method for water treatment and nutrient recovery as claimed in claim 8.

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