An orp intelligent regulation system for biochemical treatment of water quality

Abstract

This invention discloses an intelligent ORP control system for biochemical water treatment, relating to the field of micro-electric field control technology. The invention includes a wastewater tank, columns located inside the tank, and an electrode array. The wastewater tank is horizontally divided into anaerobic, anoxic, and aerobic zones; vertically, it is divided into upper and lower regions. Each column has three water sampling ports for detecting ORP and other required indicators at different depths within the tank. Differential ORP control is implemented based on the distribution of dissolved oxygen and pollutants at the bottom and top of the tank. This invention utilizes nonlinear micro-electric field control to improve the efficiency of electron gain and loss between organic molecules and O2, compensating for electrochemical factors in the biochemical reaction system that hinder pollutant degradation. This enables the degradation of pollutants by the biofilm under local electric field excitation conditions, thereby achieving precise ORP control in the three-dimensional space within the tank.

Description

Technical Field

[0001] This invention relates to the field of micro electric field control technology, and in particular to an ORP intelligent control system for water biochemical treatment. Background Technology

[0002] The biochemical reaction system in water treatment is closely related to electron transfer, with the microbial community, which plays a core role, being significantly influenced by electron transfer in its reproduction and growth. In wastewater biochemical treatment processes, oxidation-reduction potential (ORP) is a key influencing factor, showing a strong correlation with the biodegradation processes of chemical oxygen demand (COD) and biochemical oxygen demand (BOD), as well as nitrification and denitrification reactions. Taking the A2O process in wastewater treatment as an example, aerobic microorganisms grow better in environments with higher ORP values; in anoxic biological treatment, precise control of ORP values ​​is crucial for the denitrification process; and in anaerobic biological treatment, reasonable regulation of ORP values ​​is key to the efficient phosphorus release process. In the aerobic degradation stage of pollutants in wastewater biochemical treatment, organic pollutants typically act as electron donors in the electron transfer process, while oxygen (O2) is the most common electron acceptor in the biochemical reaction system. Electron donors and acceptors exhibit an interdependent relationship in the pollutant degradation process; higher ORP values ​​are more conducive to the efficient removal of pollutants.

[0003] Therefore, applying an electric field during water treatment can improve electron transfer efficiency and enhance chemical reaction and biodegradation rates. Installing electrodes within the wastewater treatment reactor can optimize the biochemical reactions at the solid-liquid interface on the anode and cathode surfaces and surrounding areas, regulating the metabolic rate and proliferation characteristics of microorganisms near the electrodes, thereby improving the degradation efficiency of organic pollutants in the biofilm-attached area. The electric field and the ORP (Organic Oxygen Response Rate) index within the reaction tank can form a coupling relationship; the suspended growth reaction system in the tank and the attached growth reaction system on the electrode surface can jointly constitute a water treatment process supported by a composite growth system. It is worth noting that using dissolved oxygen (DO) value alone as a control indicator for wastewater biological systems often results in significant deviations; while the ORP value more accurately reflects the progress stage of the biochemical reaction, effectively reducing errors in judging system operating characteristics.

[0004] Therefore, how to provide an ORP intelligent control system for water biochemical treatment to overcome the difficulties of existing technologies is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an ORP intelligent control system for water biochemical treatment, which is based on the micro electric field control with nonlinear characteristics to stimulate the tendency of organic molecules to release electrons and O2 molecules to gain electrons, thereby compensating for the negative potential factors of the O2 environment and the potential factors that are not conducive to COD degradation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An ORP intelligent control system for water biochemical treatment includes a reaction tank, a power supply module, a control module, and a parameter detection module. The reaction tank comprises a wastewater tank, a column located inside the wastewater tank, and an electrode array. The wastewater tank is divided into anaerobic, anoxic, and aerobic zones horizontally, and into upper and lower sections vertically. Each column is equipped with three water sampling ports. The parameter detection module is used to detect the ORP and other required indicators of water at different depths in the pool. The control module, connected to the parameter detection module, performs differentiated ORP regulation based on the distribution of dissolved oxygen and pollutants at the bottom and top of the pool. The power module is used to provide power to the system.

[0007] Optionally, the aerobic zone of the above system can be divided into the beginning and end of the COD treatment section, the beginning and end of the NH3-N treatment section, and the end of the NH3-N treatment section, and preset ORP values ​​can be set for the top and bottom of the pool respectively. The anoxic and anaerobic zones are further subdivided into influent and stabilization sections to address the unsuitable ORP issues brought in by sludge recirculation.

[0008] Optionally, in the above system, the water sample sampling port is set on the outer wall of the column at a specific location. Each sampling port is equipped with an independent connecting pipe. The water sample is drawn through the connecting pipe to the detector position inside the corresponding parameter detection module at a preset time by the water sample suction pump, and the detection is carried out at the top of the pool.

[0009] Optionally, in the above system, an electrode array may be arranged in each transverse zone of the wastewater tank. The anode tip in the electrode array is a stainless steel skeleton wrapped with carbon fiber material as a microbial carrier. The carbon fiber as a microbial carrier is a nitrogen-oxygen co-doped porous carbon fiber. Microbial communities proliferate and grow on the surface of the carrier to construct biofilms corresponding to anaerobic, anoxic, and aerobic water environments, respectively. The biofilm gradually wraps the carbon fiber material and is detached and regenerated in stages under the action of pulsed current. The cathode tip has the same appearance and number as the anode tip, and is made of pure stainless steel without carbon fiber.

[0010] Optionally, in the above system, each group of anode and cathode terminals connected to the circuit mains may be equipped with an independent miniature current characteristic regulator to control the current intensity and current discontinuity frequency of each terminal anode and cathode. The current intensity is in the range of 1.0mA to 120.0mA, and the current intensity of each reaction region is set to a different threshold.

[0011] The system described above may optionally include a pulse frequency adapter, which, in conjunction with a current characteristic regulator, forms an AI-coupled pulse electric field. The system adapts to the optimal pulse frequency through preset feedforward, feedback adjustment, and autonomous learning modes. Five high-frequency strong current pulses are inserted every 30 low-frequency weak current pulse cycles to cause the non-tightly bound biofilm on the electrode surface to detach, thereby screening out stable dominant bacterial films that adapt to the electric field characteristics and biochemical reaction characteristics, and realizing the degradation of pollutants by the biofilm under local electric field excitation conditions.

[0012] The above-mentioned system, optionally, includes a control module comprising a data logic calculator and a multi-parameter intelligent controller. The data logic calculator, based on a neural network model algorithm, calculates in real time the three-dimensional regional ORP characteristics of the anaerobic, anoxic, and aerobic zones of the wastewater tank, and calculates the required aeration volume, carbon source dosage, and sludge return flow for each zone. The multi-parameter intelligent controller adjusts in real time the power of the aeration blower, the operating parameters of the carbon source dosing system, and the operating parameters of the sludge return pump to ensure that the reaction conditions within the tank match the required ORP.

[0013] As can be seen from the above technical solution, compared with the prior art, the present invention provides an ORP intelligent control system for water biochemical treatment, which has the following beneficial effects: 1) Precisely detect and regulate the ORP of each reaction zone in the biochemical reaction system, and precisely regulate the ORP of dissolved oxygen and pollutant distribution in the three-dimensional space of the pool to achieve pollutant removal based on optimized ORP conditions. 2) This invention utilizes micro-electric field modulation based on nonlinear characteristics to excite (optimize) the tendency of organic molecules to release electrons and O2 molecules to gain electrons. This compensates for the negative potential factors of the O2 environment and the potential factors unfavorable to COD degradation caused by environmental factors such as pH and water temperature. 3) This invention improves the biochemical reaction at the solid-liquid interface on and near the anode and cathode surfaces by applying electric current stimulation to the biochemical reactor for wastewater treatment. This regulates the metabolic rate and proliferation characteristics of microorganisms near the electrodes, increasing the degradation rate of organic pollutants near the attached biofilm, and achieving pollutant degradation by the biofilm under local electric field excitation. Overall, this invention is a composite process that couples a suspended growth reaction system within the tank with an attached growth reaction system on the electrode surface. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of an ORP intelligent control system for water biochemical treatment disclosed in this invention. Figure 2 This is a diagram showing the internal device layout of the wastewater tank disclosed in this invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Reference Figure 1 As shown, this invention discloses an ORP intelligent control system for water biochemical treatment, including a reaction tank, a power supply module, a control module, and a parameter detection module. The reaction tank includes a wastewater tank, a column located inside the wastewater tank, and an electrode array. The wastewater tank is divided into anaerobic, anoxic, and aerobic zones horizontally, and into upper and lower sections vertically. Each column is equipped with three water sampling ports. The parameter detection module is used to detect the ORP and other required indicators of water at different depths in the pool. The control module, connected to the parameter detection module, performs differentiated ORP regulation based on the distribution of dissolved oxygen and pollutants at the bottom and top of the pool. The power module is used to provide power to the system.

[0018] Furthermore, the aerobic zone is divided into the beginning and end of the COD treatment section, the beginning and end of the NH3-N treatment section, and the end of the NH3-N treatment section, with preset ORP values ​​set for the top and bottom of the pool respectively. The anoxic and anaerobic zones are further subdivided into influent and stabilization sections to address the unsuitable ORP issues brought in by sludge recirculation.

[0019] Specifically, at the beginning of the COD treatment section in the aerobic tank, ORP is set at the bottom of the tank at 0-30mV, preferably 10mV, and at the top of the tank at 10-50mV, preferably 20mV. At the end of the COD treatment section in the aerobic tank, ORP is set at the bottom of the tank at 50-120mV, preferably 50mV, and at the top of the tank at 70-150mV, preferably 70mV. In the aerobic tank, the bottom of the NH3-N treatment section, i.e. the first end of the nitrification reaction, is set with ORP of 130-220mV, preferably 130mV, and the top of the tank is set with ORP of 150-250mV, preferably 150mV. The aerobic tank has an ORP of 300-360 mV, preferably 300 mV, at the bottom of the end tank of the NH3-N treatment section, and an ORP of 380-400 mV, preferably 380 mV, at the top of the tank. The bottom of the anoxic tank, i.e. the first end of the denitrification reaction, is set with ORP of 50-10 mV, preferably 50 mV, and the top of the tank is set with ORP of 40-0 mV, preferably 5 mV. The bottom of the anoxic tank denitrification reaction terminal tank is set with ORP = -20 to -45 mV, preferably -20 mV, and the top of the tank is set with ORP = -40 to -50 mV, preferably -40 mV. The bottom of the anaerobic tank, i.e. the biological phosphorus release reaction tank, is set with ORP = -80 to -100 mV, preferably -80 mV, and the top of the tank is set with ORP = -100 to -120 mV, preferably -100 mV. The bottom of the anaerobic biological phosphorus release terminal reaction tank is set with ORP = -235 to -250 mV, preferably -235 mV, and the top of the tank is set with ORP = -230 to -240 mV, preferably -230 mV.

[0020] Furthermore, the water sample sampling port is set on the outer wall of the column at a specific location. Each sampling port is equipped with an independent connecting pipe. The water sample is drawn through the connecting pipe to the detector position inside the corresponding parameter detection module at a preset time by the water sample suction pump, and the detection is carried out at the top of the pool.

[0021] Furthermore, the parameter detection module includes an ORP detector, a COD detector, an NH3-N detector, an auxiliary multi-parameter detector, and a DO detector. The ORP detector, COD detector, NH3-N detector, and auxiliary multi-parameter detector are directly connected to the water sample sampling port through connecting pipes, while the DO detector is placed inside the wastewater tank for direct detection.

[0022] Furthermore, refer to Figure 2 As shown, electrode arrays are arranged in each biochemical reaction tank. The electric field and the biofilm on the electrode surface improve the reaction effect at the solid-liquid interface near the electrode, thereby increasing the metabolic rate of microorganisms near the electrode. The anode tip in the electrode array has a rectangular cross-sectional shape and is composed of a stainless steel skeleton wrapped with activated carbon fiber material. The stainless steel skeleton here is made of 304 stainless steel, and the activated carbon fiber is a nitrogen-oxygen co-doped porous carbon fiber, which becomes a hydrophilic carrier that facilitates the formation of biofilm.

[0023] After a period of normal operation, microbial communities proliferate and grow on the carrier surface, constructing biofilms corresponding to aerobic, anoxic, and anaerobic aquatic environments, respectively. The biofilms gradually encapsulate the carbon fiber material and undergo phased detachment and regeneration under the action of pulsed current. This achieves the degradation of pollutants by the biofilm under local electric field excitation conditions.

[0024] Microbial communities multiply on the anode surface and use organic compounds for respiration, thereby producing electrons and protons. These electrons flow to the cathode through an external circuit. The O2 generated by respiration undergoes a two-electron reduction reaction at the cathode, creating an aeration vortex morphology and a coupling-promoting effect with the cathode electron transfer interface.

[0025] In biological treatment processes, an appropriate ORP value can promote the growth of microorganisms, accelerate the establishment of dominant bacterial communities, and promote the stabilization of the community properties.

[0026] Furthermore, the cathode tip has the same appearance and number as the anode tip, and both have a rectangular cross-section. They are made of 316L stainless steel and are not wrapped with carbon fiber.

[0027] Furthermore, the electrode array is powered by a DC power supply, with the current intensity controlled within the range of 1.0mA to 120.0mA, and the current intensity of each reaction region is set to a different threshold.

[0028] The initial low-frequency weak current intensity is assigned to 1.0mA~10.0mA.

[0029] The initial current intensity at the bottom of the aerobic tank is set to 3.0 mA, and at the top of the tank it is set to 1.0 mA. The initial current intensity at the bottom of the anoxic pool was set to 10.0 mA, and at the top of the pool it was set to 5.0 mA. The initial current intensity at the bottom of the anaerobic tank is set to 6.0 mA, and the current intensity at the top of the tank is set to 3.0 mA.

[0030] The initial high-frequency high-current intensity is assigned to 60.0mA~120.0mA.

[0031] The initial current intensity at the bottom of the aerobic tank is set to 75.0 mA, and at the top of the tank it is set to 60.0 mA. The initial current intensity at the bottom of the anoxic pool was set to 120.0 mA, and at the top of the pool it was set to 110.0 mA. The initial current intensity at the bottom of the anaerobic tank was set to 90.0 mA, and the current intensity at the top of the tank was set to 85.0 mA.

[0032] Furthermore, at the connection points between each group of anode and cathode terminals and the main circuit line, each group is equipped with an independent miniature current characteristic regulator to control the current intensity and current discontinuity frequency of each terminal anode and cathode. The current intensity is in the range of 1.0mA to 120.0mA, and the current intensity of each reaction region is set to a different threshold.

[0033] Furthermore, it also includes a pulse frequency adapter, which, combined with a current characteristic regulator, forms an AI-coupled pulse electric field. Through preset feedforward, feedback adjustment, and autonomous learning modes, it adapts to the optimal pulse frequency. Every 30 low-frequency weak current pulse cycles, 5 high-frequency strong current pulses are inserted to cause the non-tightly bound biofilm on the electrode surface to detach, and to screen out stable dominant bacterial films that adapt to the electric field characteristics and biochemical reaction characteristics, thereby realizing the degradation of pollutants by the biofilm under local electric field excitation conditions.

[0034] The frequency characteristics of the pulse frequency adapter are as follows: the duration of each low-frequency pulse is 2.1 seconds, and the interval is 10 seconds. The duration of each high-frequency pulse is 0.01 seconds, and the interval is 0.1 seconds. Based on preset values, the current frequencies of the aerobic, anoxic, and anaerobic tanks are coupled with the effluent indicators of each tank for error correction. Through real-time adjustments using a neural network model algorithm, electric field parameter characteristics adapted to the current water quality indicators are gradually formed.

[0035] Furthermore, the control module includes a data logic calculator and a multi-parameter intelligent controller. The data logic calculator, based on a neural network model algorithm, calculates the three-dimensional regional ORP characteristics of the anaerobic, anoxic, and aerobic zones in the wastewater tank in real time, and calculates the required aeration volume, carbon source dosage, and sludge return flow for each zone. The multi-parameter intelligent controller adjusts the aeration fan power, carbon source dosing system operating parameters, and sludge return pump operating parameters in real time to ensure that the reaction conditions in the tank match the required ORP.

[0036] Specifically, during the startup phase of the biochemical reaction system, first, based on the entry into A... 2 The basic preset value of ORP is input into the system control module by taking the influent water quality index data of the O process structure and the basic hydraulic data of the pool itself.

[0037] During the commissioning phase, the automatic control system was used to adjust the start-up, shutdown, and variable frequency speed control of equipment related to aeration volume, carbon source dosage, and sludge return flow online. The results were compared with the ORP values ​​for each monitoring period to serve as the basis for adjusting the parameters of each device in the next period. Simultaneously, the "dataset" generated in this phase was used as the training base for the intelligent system's machine learning. Through machine learning-based program control, using ORP variables in aerobic, anoxic, and anaerobic reaction zones as core data, a mathematical model algorithm is constructed. Based on this, the electric field parameters required for the anode and cathode positions set on each column are adjusted in real time to achieve an optimized pulse oscillation electric field. The electric field strength and frequency required for the reactor to degrade organic pollutants are adjusted in real time, ultimately forming a biochemical reaction system under electric field-assisted conditions.

[0038] Furthermore, the core algorithm of the feedback control system is based on the machine learning principle of LSTM (Long Short-Term Memory Neural Network), targeting A 2 The time-series characteristics of the anaerobic, anoxic, and aerobic zones in the O process are analyzed through machine autonomous learning using historical and field data from the tank, enabling the control system program to adapt to the specific conditions of the A process. 2 The mathematical model of the O-pool system enables a highly efficient pollutant degradation system based on ORP control indicators.

[0039] In one specific embodiment, an electrode array is deployed within the reaction tank, and a domesticated microbial community is enriched on the anode surface. An AI-coupled pulsed electric field is constructed in collaboration with a pulse frequency adapter and a current characteristic regulator to directionally regulate and optimize the microbial community, forming a microbial film with satisfactory performance. The microbial film proliferates on the anode surface and undergoes respiratory metabolism using organic compounds as substrates, producing electrons and protons. Electrons migrate to the cathode via an external circuit, and the O2 produced by respiration undergoes a two-electron reduction reaction at the cathode, thereby compensating for potential deviations that are detrimental to COD degradation caused by environmental factors such as pH and water temperature. Simultaneously, the system operating parameters are optimized in real time using a neural network model algorithm to achieve precise ORP control in the three-dimensional space within the reaction tank.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ORP intelligent control system for water biochemical treatment, characterized in that, It includes a reaction tank, a power supply module, a control module, and a parameter detection module. The reaction tank includes a wastewater tank, a column located inside the wastewater tank, and an electrode array. The wastewater tank is divided into anaerobic, anoxic, and aerobic zones horizontally, and into upper and lower sections vertically. Each column is equipped with three water sampling ports. The parameter detection module is used to detect the ORP and other required indicators of water at different depths in the pool. The control module, connected to the parameter detection module, performs differentiated ORP regulation based on the distribution of dissolved oxygen and pollutants at the bottom and top of the pool. The power module is used to provide power to the system.

2. The ORP intelligent control system for water biochemical treatment according to claim 1, characterized in that, The aerobic zone is divided into the beginning and end of the COD treatment section, the beginning and end of the NH3-N treatment section, and the end of the NH3-N treatment section, with preset ORP values ​​set for the top and bottom of the pool respectively. The anoxic and anaerobic zones are further subdivided into influent and stabilization sections to address the unsuitable ORP issues brought in by sludge recirculation.

3. The ORP intelligent control system for water biochemical treatment according to claim 1, characterized in that, The water sampling port is located on the outer wall of the column at a specific position. Each sampling port is equipped with an independent connecting pipe. The water sample is drawn through the connecting pipe to the detector position inside the corresponding parameter detection module at a preset time by the water sample suction pump, and the detection is carried out at the top of the pool.

4. The ORP intelligent control system for water biochemical treatment according to claim 1, characterized in that, Electrode arrays are arranged in each horizontal zone of the sewage tank. The anode tip in the electrode array is a stainless steel skeleton wrapped with carbon fiber material as a microbial carrier. The carbon fiber as a microbial carrier is a nitrogen-oxygen co-doped porous carbon fiber. Microbial communities proliferate and grow on the surface of the carrier to construct biofilms corresponding to anaerobic, anoxic, and aerobic water environments, respectively. The biofilm gradually wraps the carbon fiber material and is detached and regenerated in stages under the action of pulsed current. The cathode tip has the same appearance and number as the anode tip, and is made of pure stainless steel without carbon fiber.

5. The ORP intelligent control system for water biochemical treatment according to claim 4, characterized in that, The electrode array is powered by a DC power supply. At the connection points between each group of anode and cathode terminals and the main circuit line, each group is equipped with an independent miniature current characteristic regulator to control the current intensity and current discontinuity frequency at each terminal anode and cathode. The current intensity is in the range of 1.0mA to 120.0mA, and the current intensity of each reaction region is set to a different threshold.

6. The ORP intelligent control system for water biochemical treatment according to claim 5, characterized in that, It also includes a pulse frequency adapter, which, combined with a current characteristic regulator, forms an AI-coupled pulse electric field. The optimal pulse frequency is adapted through preset feedforward, feedback adjustment, and autonomous learning modes. Five high-frequency strong current pulses are inserted every 30 low-frequency weak current pulse cycles to cause the non-tightly bound biofilm on the electrode surface to detach, and to screen out stable dominant bacterial films that adapt to the electric field characteristics and biochemical reaction characteristics, thereby achieving the degradation of pollutants by the biofilm under local electric field excitation conditions.

7. The ORP intelligent control system for water biochemical treatment according to claim 1, characterized in that, The control module includes a data logic calculator and a multi-parameter intelligent controller. The data logic calculator, based on a neural network model algorithm, calculates the three-dimensional ORP characteristics of the anaerobic, anoxic, and aerobic zones in the wastewater tank in real time, and calculates the required aeration volume, carbon source dosage, and sludge return flow for each zone. The multi-parameter intelligent controller adjusts the aeration fan power, carbon source dosing system operating parameters, and sludge return pump operating parameters in real time to match the reaction conditions in the tank with the required ORP.

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