Ammonia-containing wastewater turbidity removal and de-ionization integrated treatment system and dynamic regulation and control method

Abstract

The invention relates to the technical field of ammonia-containing wastewater treatment, and discloses an ammonia-containing wastewater turbidity removal and desorption integrated treatment system and a dynamic regulation and control method.The system comprises a pretreatment unit, a turbidity removal unit, a desorption unit, an agent adding unit and a dynamic regulation and control unit; the pretreatment unit is respectively connected with the turbidity removal unit, the medicament adding unit and the dynamic regulation and control unit, the turbidity removal unit is also connected with the separation subunit and the dynamic regulation and control unit, and the separation subunit is also connected with the dynamic regulation and control unit. According to the integrated treatment system for turbidity removal and desorption of ammonia-containing wastewater and the dynamic regulation and control method provided by the invention, efficient turbidity removal and desorption of ammonia-containing wastewater, precise adaptation to water quality fluctuation, optimization of medicament energy consumption and improvement of treatment stability and economical efficiency are realized through superconducting magnetic separation, multi-stage resin tanks and dynamic regulation and control; the technical problems that a traditional process is low in efficiency, high in cost and poor in adaptability are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ammonia-containing wastewater treatment, in particular to an ammonia-containing wastewater turbidity and ion removal integrated treatment system and a dynamic control method. BACKGROUND

[0002] In the field of ammonia-containing wastewater treatment, traditional turbidity removal processes such as flocculation sedimentation and plate and frame filtration have significant technical bottlenecks. Flocculation sedimentation relies on static mixing and natural sedimentation, and the formation of flocs is slow and easily disturbed by factors such as water quality pH and temperature, resulting in low treatment efficiency. Plate and frame filtration can achieve solid-liquid separation, but the filtration period is long and the moisture content of the filter residue is high, which not only increases the burden of subsequent solid waste treatment, but also has the problems of filter cloth blockage and high maintenance cost. Although ion exchange resin method can effectively remove ammonia nitrogen and complex metal ions, acid ions, the adsorption selectivity of the resin for different concentrations of ammonia nitrogen and coexisting ions is greatly different. When facing the ammonia-containing wastewater generated by multiple systems in methionine production, the traditional fixed parameter operation mode is difficult to dynamically adapt to the significant fluctuations in water quality ammonia nitrogen concentration, turbidity, and sulfate content, which can easily cause resin overload failure and frequent regeneration. In addition, the existing technology lacks a mechanism for coordinated perception and self-adaptive control of the differences in wastewater turbidity and ammonia nitrogen concentration, and cannot achieve efficient connection and parameter linkage optimization of the turbidity removal and ion removal processes, resulting in unstable overall treatment effect and serious resource waste.

[0003] At the same time, in the existing technology, the dosage of reagents depends on manual experience, which is difficult to achieve precise control, resulting in waste of reagents and high processing cost. In addition, the resin regeneration period is short and the energy consumption is large, and there is no coordinated treatment system for turbidity removal and ion removal, which cannot meet the requirements of deep treatment and environmental protection discharge of high ammonia and high turbidity industrial wastewater. SUMMARY

[0004] The present application provides an ammonia-containing wastewater turbidity and ion removal integrated treatment system and a dynamic control method, which realizes efficient turbidity and ion removal of ammonia-containing wastewater, accurately adapts to water quality fluctuations, optimizes reagent energy consumption, improves treatment stability and economy, and solves the technical problems of low efficiency, high cost, and poor adaptability of traditional processes.

[0005] The present application provides an ammonia-containing wastewater turbidity and ion removal integrated treatment system, which comprises a pretreatment unit, a turbidity removal unit, an ion removal unit, a reagent dosing unit, and a dynamic control unit. The pretreatment unit is connected to the turbidity removal unit, the reagent dosing unit, and the dynamic control unit. The turbidity removal unit is also connected to the ion removal unit and the dynamic control unit. The ion removal unit is also connected to the dynamic control unit.

[0006] The pretreatment unit comprises a wastewater inlet pump, a pH adjusting tank, and a high-efficiency flocculation reactor; the turbidity removal unit comprises a superconducting magnetic separation filter and a filter residue collection box; the ion removal unit comprises a resin tank, a positive bed tank, a negative bed tank, and a treated water tank; the reagent adding unit comprises ammonia water storage tanks, sulfuric acid storage tanks, ferrous sulfate storage tanks, PAM storage tanks, activated carbon storage tanks, and metering pumps; and the dynamic regulation unit comprises a PLC control cabinet, a pH sensor, a turbidimeter, an ammonia nitrogen online monitor, and a conductivity meter.

[0007] The ammonia-containing wastewater is pumped into the pH adjusting tank by the wastewater inlet pump, the pH is adjusted to 9.5 by automatically adding ammonia water or sulfuric acid through the pH sensor, and then the wastewater enters the high-efficiency flocculation reactor, ferrous sulfate, PAM, and activated carbon are added, and flocs are formed under the action of the cyclone stirring, and then the wastewater flows into the superconducting magnetic separation filter, the flocs are quickly separated by the magnetic field and the turbidity is reduced, the filtered liquid sequentially passes through the resin tank for ammonia removal, the positive bed tank for positive ion removal, and the negative bed tank for negative ion removal, and the treated water is stored in the water tank and automatically backflows when the conductivity exceeds the standard; during the whole process, the PLC control cabinet dynamically adjusts the reagent adding amount and the resin operation mode according to the real-time data of the pH sensor, the turbidimeter, the ammonia nitrogen monitor, and the conductivity meter, so as to realize the treatment of turbidity removal and ion removal.

[0008] Further, in the pretreatment unit, the wastewater inlet pump is connected to the pH adjusting tank, the pH adjusting tank is connected to the high-efficiency flocculation reactor, the reagent adding unit, and the dynamic regulation unit, and the high-efficiency flocculation reactor is connected to the turbidity removal unit and the reagent adding unit.

[0009] Further, in the pretreatment unit,

[0010] The wastewater inlet pump is used to pump the ammonia-containing wastewater from the original system into the treatment system at a preset flow rate; wherein the ammonia-containing wastewater is methionine GW system waste liquid.

[0011] The pH adjusting tank is provided with a variable frequency stirrer, the water quality is monitored in real time by the dynamic regulation unit, and the pH is adjusted to 9.5±0.5 by automatically adding 20% ammonia water or sulfuric acid.

[0012] The high-efficiency flocculation reactor is a cyclone flocculation tank connected to the reagent adding unit, and the wastewater and the reagents form a vortex under the action of the cyclone blades to accelerate the formation of flocs.

[0013] Further, in the turbidity removal unit, the high-efficiency flocculation reactor is connected to the superconducting magnetic separation filter, the superconducting magnetic separation filter is connected to the ion removal unit, the dynamic regulation unit, and the filter residue collection box, and the filter residue collection box is also connected to the ion removal unit.

[0014] Further, in the turbidity removal unit,

[0015] The superconducting magnetic separation filter adopts a 0.3T superconducting magnet, is internally filled with stainless steel magnetic medium, and when flocculated wastewater passes through a magnetic field, magnetic flocs are quickly adsorbed and separated.

[0016] The filter residue collection tank is used for collecting the filter residue generated in the filtering process, so as to reduce the water content and reduce the solid waste treatment amount, and a screw conveyor is arranged at the bottom of the filter residue collection tank and used for automatically conveying the filter residue to the filter press.

[0017] Further, in the deionization unit, the resin tank is connected with the superconducting magnetic separation filter, the filter residue collection tank, the dynamic regulation unit, and the positive bed tank, the positive bed tank is connected with the negative bed tank, and the negative bed tank is connected with the treated water tank and the dynamic regulation unit.

[0018] The resin tank is filled with macroporous weak acid resin to remove ammonium ions in the wastewater, and according to the water quality difference, a single tank is operated for first-stage wastewater and double tanks are connected in series for second-stage wastewater.

[0019] The positive bed tank is used for filling strong acid cation resin to remove sodium ions, calcium ions, magnesium ions and iron ions.

[0020] The negative bed tank is used for filling strong base anion resin to remove sulfate ions and chloride ions.

[0021] The treated water tank is used for storing treated wastewater, and an electric conductivity instrument is arranged in the treated water tank, and when the electric conductivity exceeds the standard, the wastewater is automatically returned to the resin tank for secondary treatment.

[0022] Further, in the medicament dosing unit, the ammonia water storage tank, the sulfuric acid storage tank, the ferrous sulfate storage tank, the PAM storage tank and the activated carbon storage tank are respectively connected with a metering pump, the metering pumps of the ammonia water storage tank and the sulfuric acid storage tank are connected with the pH adjusting tank, and the metering pumps of the ferrous sulfate storage tank, the PAM storage tank and the activated carbon storage tank are connected with the high-efficiency flocculation reactor.

[0023] The ammonia water storage tank, the sulfuric acid storage tank, the ferrous sulfate storage tank, the PAM storage tank and the activated carbon storage tank are respectively matched with metering pumps with electromagnetic flow meters, and the metering pumps accurately dose the medicaments into the corresponding devices according to the instructions of the dynamic regulation unit.

[0024] Further, in the dynamic regulation unit, the PLC control cabinet is connected with the pH sensor, the turbidimeter, the ammonia nitrogen online monitor and the electric conductivity instrument, the pH sensor is further connected with the pH adjusting tank, the turbidimeter is further connected with the superconducting magnetic separation filter, the ammonia nitrogen online monitor is further connected with the resin tank, and the electric conductivity instrument is further connected with the negative bed tank.

[0025] Further, in the dynamic regulation unit,

[0026] The PLC control cabinet receives the data of the pH sensor, turbidimeter, ammonia nitrogen online monitor and conductivity meter in real time, and automatically generates a control instruction;

[0027] The pH sensor is installed in a pH adjusting tank, and feeds back the pH value in real time to control the opening degree of the metering pump of the ammonia water storage tank and sulfuric acid storage tank, so as to ensure the stability of the pH value of the flocculation reaction;

[0028] The turbidimeter is installed at the outlet of the filter, and is used for monitoring the turbidity and triggering the backwashing program of the filter when the turbidity exceeds the standard;

[0029] The ammonia nitrogen online monitor and conductivity meter monitor the ammonia nitrogen concentration of the water entering and leaving the resin tank and the ion content of the treated water, and automatically adjust the operation mode and backflow strategy of the resin tank; wherein the operation mode of the resin tank includes single tank and series connection.

[0030] The application also provides a dynamic control method for integrated treatment of ammonia-containing wastewater turbidity removal and ion removal, based on the integrated treatment system for ammonia-containing wastewater turbidity removal and ion removal, the method specifically comprises:

[0031] S1, the pH sensor, turbidimeter, ammonia nitrogen online monitor and conductivity meter are used to collect the water quality data of the pH adjusting tank, the outlet of the superconducting magnetic separation filter, the inlet and outlet of the resin tank and the treated water tank in real time, and the data is transmitted to the PLC control cabinet synchronously to form a real-time monitoring data stream;

[0032] S2, the PLC control cabinet triggers a hierarchical strategy according to the ammonia nitrogen monitoring data: if the ammonia nitrogen concentration is less than 1000 ppm, the resin tank is controlled to operate in single tank mode; if the ammonia nitrogen concentration is greater than or equal to 1000 ppm, the double resin tank series connection mode is automatically started, and the contact time is prolonged, and the flow rate and operation mode are switched through the electromagnetic valve at the inlet and outlet of the resin tank;

[0033] S3, when the turbidity after flocculation is greater than a first set value, the PLC control cabinet instructs to increase the dosing amount of 10% ferrous sulfate and 5% PAM, and at the same time, the rotating speed of the cyclone flocculation reactor is increased; if the turbidity after magnetic separation is greater than a second set value, the backwashing program is triggered immediately, the water inlet valve of the superconducting magnetic separation filter is closed, and the 0.5 MPa high-pressure water backwashing magnetic medium is opened, and the backwashing water is the treated and reused water to save energy consumption;

[0034] S4, the PLC control cabinet receives the turbidity, ammonia nitrogen, sulfate, pH value and wastewater flow data and calculates the reagent ratio, and outputs signals to control the opening degree of the metering pump of the ammonia water storage tank, sulfuric acid storage tank, ferrous sulfate storage tank, PAM storage tank and activated carbon storage tank; wherein in the reagent ratio, the ferrous sulfate is 0.1-1%, the PAM is ≤0.2%, and the activated carbon is 0.1-0.5%.

[0035] S5, the conductivity meter real-time monitoring water quality of the water tank after treatment, when the conductivity is greater than the third set value, the PLC control cabinet controls the backflow valve to open, and the water exceeding the standard is introduced into the positive bed tank and the negative bed tank for secondary treatment again;

[0036] S6, the PLC control cabinet periodically performs self-diagnosis on the sensor accuracy, metering pump flow and resin tank pressure, and when detecting equipment abnormalities, automatically alarms and switches to standby equipment to ensure continuous and stable operation of the regulation and control system.

[0037] The beneficial effects of the present application are:

[0038] The present application replaces traditional filtration with superconducting magnetic separation, realizes efficient and rapid turbidity removal, significantly reduces the moisture content of filter residue and reduces the amount of solid waste treatment; multi-stage resin combination and enhanced ion deep removal improve the corrosion resistance and exchange capacity of the resin; the dynamic regulation mechanism can real-time sense water quality fluctuations, accurately adapt to different ammonia nitrogen concentrations and turbidity conditions, automatically optimize reagent addition and equipment operation parameters; the whole process closed-loop control realizes integrated operation from data acquisition, intelligent decision-making to execution feedback, greatly improves the processing efficiency and stability, reduces reagent consumption and energy consumption, effectively solves the problems of poor adaptability, high cost and unstable treatment effect of traditional process, and significantly improves the economic efficiency and environmental benefits of industrial ammonia-containing wastewater treatment. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the ammonia-containing wastewater turbidity and ion removal integrated treatment system in the present application.

[0040] Figure 2 It is a flowchart of the dynamic regulation method for ammonia-containing wastewater turbidity and ion removal integrated treatment in the present application.

[0041] The implementation of the present application, functional characteristics and advantages will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0043] Ethylene glycol, boiling point 197.3°C, melting point -12.9°C, can be miscible with water in any proportion, after miscible with water, the freezing point is significantly reduced, can be used as a refrigerant, but in the long run, ethylene glycol will undergo chemical and physical changes, resulting in color change from yellow to red, and the increase of insoluble substances, resulting in reduced heat transfer efficiency, increased operating costs, and also exacerbating the corrosion of equipment. Ethylene glycol will undergo oxidation, through intermediates such as hydroxyacetaldehyde, glyoxal, hydroxyacetic acid or aldehyde acetic acid, finally generating oxalic acid, thus causing the system to be acidified and exacerbating the corrosion of the equipment; ammonia is often used to transfer energy between refrigerants and diethylene glycol, and in the long-term use process, ammonia may escape into ethylene glycol, and ammonia-containing ethylene glycol further corrodes equipment made of aluminum, iron and copper; ethylene glycol may introduce acid and alkali media in the face of different use conditions during long-term cooling, and if not treated, it will also cause corrosion of metal equipment; ethylene glycol may breed microorganisms during long-term use, plus the introduction of impurities and unknown impurities, producing insoluble impurities, suspended / emulsified in the entire ethylene glycol system, resulting in reduced heat transfer efficiency. Methionine GW faces the above problems and needs to be treated before it can be used efficiently.

[0044] GW has four sets of systems, two sets of -10°C and two sets of -20°C, which are separate systems, and the impurities introduced during use are also different, as follows:

[0045]

[0046] The problems are as follows:

[0047] a. The color and turbidity are too high, and a heat insulation layer is formed on the wall of the heat exchange tube due to the accumulation of temperature difference, or the internal heat transfer efficiency may be poor.

[0048] b. The ions exceed the standard, and the corrosion of the pipe material during use exacerbates the problem.

[0049] c. The four sets of systems are independent, and there are differences in the treatment process, and the water introduced and the ethylene glycol lost need to be calculated and added separately.

[0050] d. The four sets of systems are independent, and continuous or intermittent treatment each has advantages and disadvantages.

[0051] For example Figure 1As shown, the present application provides a turbidity and ion removal integrated treatment system for ammonia-containing wastewater, comprising a pretreatment unit, a turbidity removal unit, a ion removal unit, a reagent adding unit, a dynamic control unit, the pretreatment unit is connected with the turbidity removal unit, the reagent adding unit and the dynamic control unit respectively, the turbidity removal unit is further connected with the ion removal unit and the dynamic control unit, and the ion removal unit is further connected with the dynamic control unit; the pretreatment unit comprises a wastewater inlet pump, a pH adjusting tank and a high-efficiency flocculation reactor, the turbidity removal unit comprises a superconducting magnetic separation filter and a filter residue collection box, the ion removal unit comprises a resin tank, a positive bed tank, a negative bed tank and a treated water tank, the reagent adding unit comprises an ammonia water storage tank, a sulfuric acid storage tank, a ferrous sulfate storage tank, a PAM storage tank, an activated carbon storage tank and a metering pump, and the dynamic control unit comprises a PLC control cabinet, a pH sensor, a turbidimeter, an ammonia nitrogen online monitor and a conductivity meter.

[0052] The treatment process of the present application is as follows:

[0053] The ammonia-containing wastewater is pumped into the pH adjusting tank through the wastewater inlet pump, the pH is adjusted to 9.5 by monitoring through the pH sensor and automatically adding ammonia water or sulfuric acid, then enters the high-efficiency flocculation reactor, ferrous sulfate, PAM and activated carbon are added, and flocs are formed under the action of cyclone stirring, then flows into the superconducting magnetic separation filter, the flocs are quickly separated by the magnetic field and the turbidity is reduced, the filtered liquid sequentially passes through the resin tank for ammonia removal, the positive bed tank for positive ion removal and the negative bed tank for negative ion removal, and the treated water is stored in the water tank and automatically backflows when the conductivity exceeds the standard; during the whole process, the PLC control cabinet dynamically adjusts the reagent adding amount and the resin operation mode according to the real-time data of the pH sensor, the turbidimeter, the ammonia nitrogen monitor and the conductivity meter, so as to realize the treatment of turbidity and ion removal.

[0054] (1) Pretreatment unit

[0055] The pretreatment unit comprises a wastewater inlet pump, a pH adjusting tank and a high-efficiency flocculation reactor, the wastewater inlet pump is connected with the pH adjusting tank, the pH adjusting tank is connected with the high-efficiency flocculation reactor, the reagent adding unit and the dynamic control unit respectively, and the high-efficiency flocculation reactor is connected with the turbidity removal unit and the reagent adding unit.

[0056] The functions of each treatment device are as follows:

[0057] Wastewater inlet pump: pump the ammonia-containing wastewater (methionine GW system wastewater) from the original system into the treatment system, the designed flow rate is 25 m 3 / h, the pipeline material is rubber-lined carbon steel to resist corrosion of the wastewater.

[0058] pH adjusting tank: carbon steel material, built-in variable frequency stirrer, real-time monitoring of water quality through pH sensor, automatic addition of 20% ammonia or sulfuric acid, pH adjustment to 9.5±0.5, creating optimal conditions for subsequent flocculation reaction.

[0059] High-efficiency flocculation reactor: cyclone flocculation tank, 45° conical bottom design, integrated ferrous sulfate, PAM, and activated carbon automatic dosing unit, wastewater and chemicals form vortex under the action of cyclone blades, accelerate flocculation, turbidity reduced to <200 NTU.

[0060] (2) Turbidity removal unit

[0061] The turbidity removal unit includes a superconducting magnetic separation filter and a filter residue collection box. The high-efficiency flocculation reactor is connected to the superconducting magnetic separation filter, which is connected to the deionization unit, dynamic control unit, and filter residue collection box. The filter residue collection box is also connected to the deionization unit.

[0062] The functions of each treatment device are as follows:

[0063] Superconducting magnetic separation filter: 0.3T superconducting magnet, internal filling of stainless steel magnetic medium. When flocculated wastewater passes through the magnetic field, magnetic flocs are quickly adsorbed and separated, improving turbidity removal efficiency, with effluent turbidity <5 NTU. The conical bottom design facilitates filter residue settling, and the backwashing device periodically removes impurities from the surface of the magnetic medium.

[0064] Filter residue collection box: collects filter residue, reduces moisture content, and reduces solid waste treatment volume. The box bottom is equipped with a screw conveyor for automatic delivery to the filter press.

[0065] (3) Deionization unit

[0066] The deionization unit includes a resin tank, a positive bed tank, a negative bed tank, and a treated water tank. The resin tank is connected to the superconducting magnetic separation filter, filter residue collection box, dynamic control unit, and positive bed tank. The positive bed tank is connected to the negative bed tank, and the negative bed tank is connected to the treated water tank and dynamic control unit.

[0067] The functions of each treatment device are as follows:

[0068] Resin tank: titanium alloy lining, filled with macroporous weak acid resin, removes ammonium ions (ammonia) in wastewater. According to water quality differences, single-tank operation for first-stage wastewater (ammonia nitrogen 520-555 ppm), double-tank series connection for second-stage wastewater (4417-4190 ppm), improving ammonia removal rate.

[0069] Positive bed tank: titanium alloy lining, filled with strong acid cation exchange resin, removes sodium ions, calcium, magnesium, iron, and other cations. Inlet water cation concentration (such as sodium ions 211-777 ppm), outlet water ≤10 ppm, improving resin exchange capacity.

[0070] Anode bed tank: titanium alloy lining, filled with strong anion resin, remove sulfate, chloride ions, etc. The water sulfate is 485-445 ppm, and the effluent is ≤50 ppm. After being connected in series with the cathode bed tank, the ion concentration of the effluent meets the boiler water standard.

[0071] Treated water tank: stores treated wastewater, with a conductivity meter inside. When the standard is exceeded, it automatically returns to the resin tank for secondary treatment, ensuring stable effluent quality.

[0072] (4) Chemical dosing unit

[0073] The chemical dosing unit includes ammonia storage tank, sulfuric acid storage tank, ferrous sulfate storage tank, PAM storage tank, activated carbon storage tank, and metering pumps. Each of the ammonia storage tank, sulfuric acid storage tank, ferrous sulfate storage tank, PAM storage tank, and activated carbon storage tank is connected to a metering pump. The metering pumps of the ammonia storage tank and sulfuric acid storage tank are connected to the pH adjustment tank, and the metering pumps of the ferrous sulfate storage tank, PAM storage tank, and activated carbon storage tank are connected to the high-efficiency flocculation reactor.

[0074] The ammonia storage tank, sulfuric acid storage tank, ferrous sulfate storage tank, PAM storage tank, and activated carbon storage tank are each equipped with a metering pump with a electromagnetic flowmeter. According to the instructions of the dynamic control unit, the corresponding equipment is accurately dosed with chemicals. For example, the second-stage high-ammonia wastewater automatically increases the activated carbon dosage by 10%, reducing the error of chemical dosing and saving costs.

[0075] (5) Dynamic control unit

[0076] The dynamic control unit includes a PLC control cabinet, a pH sensor, a turbidimeter, an ammonia nitrogen online monitor, and a conductivity meter. The PLC control cabinet is connected to the pH sensor, turbidimeter, ammonia nitrogen online monitor, and conductivity meter. The pH sensor is also connected to the pH adjustment tank, the turbidimeter is also connected to the superconducting magnetic separation filter, the ammonia nitrogen online monitor is also connected to the resin tank, and the conductivity meter is also connected to the anode bed tank.

[0077] The functions of each treatment device are as follows:

[0078] PLC control cabinet: receives real-time data from the pH sensor, turbidimeter, ammonia nitrogen online monitor, and conductivity meter, and automatically generates control instructions (such as resin flow rate and chemical dosage).

[0079] pH sensor: installed in the pH adjustment tank, with an accuracy of ±0.1, real-time feedback of pH value, ammonia storage tank, sulfuric acid storage tank metering pump opening, to ensure stable flocculation reaction pH.

[0080] Turbidimeter: installed at the outlet of the filter, monitors turbidity <5 NTU, and triggers the filter backwash program when the standard is exceeded.

[0081] Ammonia nitrogen on-line monitor, conductivity meter: monitor the ammonia nitrogen concentration of water in and out of the resin tank and the ion content of treated water, automatically adjust the operation mode (single tank / series) and reflux strategy of the resin tank.

[0082] The normal processing flow of the application: ammonia-containing wastewater→pH adjustment to 9.5→cyclone flocculation to generate flocs→ultra-conductive magnetic separation filtration (turbidity <5 NTU)→resin tank ammonia removal→cation bed tank and anion bed tank deionization→treated water tank reuse.

[0083] Dynamic control trigger scenario: when the second-stage GW1 wastewater (ammonia nitrogen 4417 ppm) enters the system, the PLC detects that the ammonia nitrogen is >1000 ppm, automatically starts the double-resin-tank series operation, and increases the 10% activated carbon dosage in the flocculation stage to improve the ammonia nitrogen removal rate, and the effluent ammonia nitrogen is ≤10 ppm.

[0084] Intelligent reagent dosing: the PLC control cabinet uses a 3-layer BP neural network (node number 10-8-5) to predict the reagent dosage based on real-time turbidity and ammonia nitrogen data, the training data comes from the historical treatment data of four sets of wastewater of the methionine GW system (sample size 500 groups), the error back propagation algorithm optimizes the weight, and the reagent dosage prediction error is <5%; the optimal ferrous sulfate dosage (0.1-1%) is calculated, and the precise dosage is added through the metering pump to reduce reagent waste. Through the collaborative connection and dynamic control of each unit device, the application realizes efficient treatment of ammonia-containing wastewater turbidity and deionization, especially for high ammonia and high turbidity wastewater of the methionine GW system, improves the treatment efficiency, reduces the energy consumption, and realizes the resource utilization of industrial wastewater.

[0085] As shown in Figure 2 The application also provides a dynamic control method for ammonia-containing wastewater turbidity and deionization integrated treatment, based on the ammonia-containing wastewater turbidity and deionization integrated treatment system as described above, the method specifically comprises:

[0086] S1, real-time water quality data acquisition and transmission

[0087] Through the pH sensor (accuracy ±0.1), turbidity meter, ammonia nitrogen on-line monitor and conductivity meter, the water quality data of the pH adjustment tank, the ultra-conductive magnetic separation filter outlet, the resin tank inlet and outlet and the treated water tank are collected in real time, and are transmitted to the PLC control cabinet synchronously to form real-time monitoring data flow, and the sampling frequency is 10 Hz, which provides a data basis for dynamic control.

[0088] S2, ammonia nitrogen concentration grading control execution

[0089] PLC triggers the hierarchical strategy according to the ammonia nitrogen monitoring data: if the ammonia nitrogen concentration <1000 ppm (first-stage wastewater), control the resin tank to run single tank, flow rate 15 m / h; if ≥1000 ppm (second-stage wastewater), automatically start the double resin tank series mode, flow rate reduced to 12 m / h, and prolong the contact time, through the resin tank inlet and outlet electromagnetic valve to realize the switching of flow rate and operation mode.

[0090] S3, turbidity dynamic adaptation and backwashing control

[0091] When the flocculation turbidity >300 NTU, the PLC instruction increases 10% ferrous sulfate and 5% PAM dosage, and at the same time, the cyclone flocculation reactor speed is increased; if the magnetic separation turbidity >5 NTU, the backwashing program is triggered immediately, the filter water inlet valve is closed, and the 0.5 MPa high-pressure water backwashing magnetic medium is opened for 5 minutes, and the backwashing water uses the treated and reused water to save energy consumption.

[0092] S4, neural network model intelligent reagent dosing

[0093] The PLC built-in neural network model receives turbidity, ammonia nitrogen, sulfate, pH value and wastewater flow data, calculates the optimal reagent ratio (ferrous sulfate 0.1-1%, PAM ≤0.2%, activated carbon 0.1-0.5%) through 3-layer BP neural network, and outputs the signal to control the opening degree of the metering pump of the ammonia water storage tank, the sulfuric acid storage tank, the ferrous sulfate storage tank, the PAM storage tank and the activated carbon storage tank.

[0094] S5, treated water quality closed-loop verification and backflow

[0095] The conductivity meter monitors the treated water tank water quality in real time, when the conductivity >10 μS / cm, the PLC controls the backflow valve to open, and the over-standard water is re-directed to the anode bed tank and the cathode bed tank for secondary treatment; at the same time, according to the backflow data, the neural network model parameters are automatically corrected, forming a monitoring-treatment-verification-optimization closed-loop control system.

[0096] S6, system operation state self-diagnosis and maintenance

[0097] The PLC regularly performs self-diagnosis on the sensor accuracy (such as pH sensor calibration), metering pump flow (electromagnetic flowmeter error) and resin tank pressure, when detecting equipment abnormalities (such as magnetic separation filter pressure difference >0.1 MPa), automatically alarms and switches to the standby equipment, to ensure the continuous and stable operation of the control system.

[0098] The application replaces traditional filtration by superconducting magnetic separation, realizes efficient and rapid turbidity removal, significantly reduces the moisture content of filter residue and reduces the amount of solid waste treatment; multi-stage resin combination and enhanced ion deep removal improve the corrosion resistance and exchange capacity of the resin; the dynamic regulation mechanism can sense water quality fluctuations in real time, accurately adapt to different ammonia nitrogen concentrations and turbidity conditions, automatically optimize reagent addition and equipment operating parameters; the whole process closed-loop control realizes integrated operation from data acquisition, intelligent decision-making to execution feedback, greatly improves the processing efficiency and stability, reduces reagent consumption and energy consumption, effectively solves the problems of poor adaptability, high cost and unstable treatment effect of traditional process, and significantly improves the economic efficiency and environmental protection benefit of industrial ammonia-containing wastewater treatment.

[0099] It should be noted that in this document, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, device, article or method including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such a process, device, article or method. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0100] The above description is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. An integrated treatment system for deturbidity and deionization of ammonia-containing wastewater, characterized in that: It includes a pretreatment unit, a deturbidity unit, a separation unit, a drug dosing unit, and a dynamic control unit. The pretreatment unit is connected to the deturbidity unit, the drug dosing unit, and the dynamic control unit respectively. The deturbidity unit is also connected to the separation unit and the dynamic control unit. The separation unit is also connected to the dynamic control unit. The pretreatment unit includes a wastewater inlet pump, a pH adjustment tank, and a high-efficiency flocculation reactor; the deturbidity unit includes a superconducting magnetic separation filter and a filter residue collection box; the deionization unit includes a resin tank, a cationic bed tank, a cationic bed tank, and a treated water tank; the reagent dosing unit includes an ammonia storage tank, a sulfuric acid storage tank, a ferrous sulfate storage tank, a PAM storage tank, an activated carbon storage tank, and a metering pump; the dynamic control unit includes a PLC control cabinet, a pH sensor, a turbidity meter, an ammonia nitrogen online monitor, and a conductivity meter; The ammonia-containing wastewater is sent into the pH adjustment tank through the wastewater inlet pump, monitored by the pH sensor and automatically added with ammonia water or sulfuric acid to adjust the pH to 9.5, and then enters the high-efficiency flocculation reactor, where ferrous sulfate, PAM and activated carbon are added to form flocs under cyclonic stirring, and then flows into the superconducting magnetic separation filter, where the magnetic field is used to quickly separate the flocs and reduce turbidity. The filtered liquid passes through the resin tank for deammoniation, the cation bed tank for decationization, and the anion bed tank for deanionization in turn. The treated water is stored in the water tank and automatically refluxes when the conductivity exceeds the standard. During the whole process, the PLC control cabinet dynamically adjusts the dosage of the reagent and the resin operation mode according to the real-time data of the pH sensor, turbidity meter, ammonia nitrogen monitor and conductivity meter to achieve deturbidity and deionization treatment.

2. The integrated treatment system for deturbidity and deionization of ammonia-containing wastewater according to claim 1, characterized in that: In the pretreatment unit, the wastewater inlet pump is connected to the pH adjustment tank, the pH adjustment tank is respectively connected to the high-efficiency flocculation reactor, the drug dosing unit, and the dynamic control unit, and the high-efficiency flocculation reactor is respectively connected to the deturbidity unit and the drug dosing unit.

3. The integrated deturbidity and deionization treatment system for ammonia-containing wastewater according to claim 2, characterized in that: In the pre-processing unit, The wastewater inlet pump is used to pump ammonia-containing wastewater from the original system into the treatment system at a preset flow rate; wherein the ammonia-containing wastewater is the waste liquid of the methionine GW system; The pH adjustment tank is equipped with a variable frequency stirrer, which monitors the water quality in real time through the dynamic control unit and automatically adds 20% ammonia water or sulfuric acid to adjust the pH to 9.5±0.5; The high-efficiency flocculation reactor is a cyclone flocculation tank connected to a reagent dosing unit. The wastewater and the reagent form a vortex under the action of cyclone blades, thereby accelerating the formation of flocs.

4. The integrated deturbidity and deionization treatment system for ammonia-containing wastewater according to claim 3, characterized in that: In the deturbidity unit, the high-efficiency flocculation reactor is connected to the superconducting magnetic separation filter, the superconducting magnetic separation filter is respectively connected to the deionization unit, the dynamic control unit, and the filter residue collection box, and the filter residue collection box is also connected to the deionization unit.

5. The integrated deturbidity and deionization treatment system for ammonia-containing wastewater according to claim 4, characterized in that: In the deturbidity unit, The superconducting magnetic separation filter uses a 0.3T superconducting magnet and is filled with stainless steel wool magnetic media. When the flocculated wastewater passes through the magnetic field, the magnetic flocs are quickly adsorbed and separated. The filter residue collecting box is used to collect floccules produced by filtration to reduce the moisture content and reduce the amount of solid waste treatment. A screw conveyor is provided at the bottom of the filter residue collecting box for automatically conveying it to the filter press.

6. The integrated deturbidity and deionization treatment system for ammonia-containing wastewater according to claim 5, characterized in that: In the deionization unit, the resin tank is connected to the superconducting magnetic separation filter, the filter residue collection box, the dynamic control unit, and the cation bed tank, the cation bed tank is connected to the anion bed tank, and the anion bed tank is respectively connected to the treated water tank and the dynamic control unit; The resin tank is filled with macroporous weak acid resin to remove ammonium ions from the wastewater. According to the difference in water quality, the first-phase wastewater is operated in a single tank, and the second-phase wastewater is operated in two tanks in series; The cationic bed tank is used to fill with strong acidic cationic resin to remove sodium ions, calcium, magnesium and iron; The anion bed tank is used to fill with strong alkaline anion resin to remove sulfate and chloride ions; The treated water tank is used to store treated wastewater and is equipped with a conductivity meter. When the conductivity exceeds the standard, the wastewater is automatically returned to the resin tank for secondary treatment.

7. The integrated treatment system for deturbidity and deionization of ammonia-containing wastewater according to claim 6, characterized in that: In the reagent dosing unit, the ammonia water storage tank, sulfuric acid storage tank, ferrous sulfate storage tank, PAM storage tank, and activated carbon storage tank are respectively connected to a metering pump, the metering pumps of the ammonia water storage tank and sulfuric acid storage tank are all connected to the pH adjustment tank, and the metering pumps of the ferrous sulfate storage tank, PAM storage tank, and activated carbon storage tank are all connected to the high-efficiency flocculation reactor; The ammonia storage tank, sulfuric acid storage tank, ferrous sulfate storage tank, PAM storage tank, and activated carbon storage tank are respectively equipped with metering pumps with electromagnetic flow meters, and the reagents are accurately added to the corresponding equipment according to the instructions of the dynamic control unit.

8. The integrated deturbidity and deionization treatment system for ammonia-containing wastewater according to claim 7, characterized in that: In the dynamic control unit, the PLC control cabinet is respectively connected to the pH sensor, turbidity meter, ammonia nitrogen online monitor, and conductivity meter; the pH sensor is also connected to the pH adjustment tank; the turbidity meter is also connected to the superconducting magnetic separation filter; the ammonia nitrogen online monitor is also connected to the resin tank; and the conductivity meter is also connected to the anion bed tank.

9. The integrated deturbidity and deionization treatment system for ammonia-containing wastewater according to claim 8, characterized in that: In the dynamic control unit, The PLC control cabinet receives data from the pH sensor, turbidity meter, ammonia nitrogen online monitor, and conductivity meter in real time, and automatically generates control instructions; The pH sensor is installed in the pH adjustment tank to provide real-time feedback of the pH value to control the opening of the metering pumps of the ammonia storage tank and the sulfuric acid storage tank to ensure the pH stability of the flocculation reaction; The turbidity meter is installed at the filter outlet to monitor turbidity and trigger the filter backwash procedure when the turbidity exceeds the standard; The ammonia nitrogen online monitor and conductivity meter monitor the ammonia nitrogen concentration of the resin tank inlet and outlet water and the ion content of the treated water, and automatically adjust the resin tank operation mode and reflux strategy; wherein, the resin tank operation mode includes single tank and series connection.

10. A dynamic control method for integrated treatment of turbidity removal and deionization of ammonia-containing wastewater, characterized in that: Based on the integrated treatment system for deturbidity and deionization of ammonia-containing wastewater according to any one of claims 1 to 9, the method specifically comprises: S1. Using the pH sensor, turbidity meter, ammonia nitrogen online monitor, and conductivity meter, water quality data from the pH adjustment tank, superconducting magnetic separation filter outlet, resin tank inlet and outlet, and treated water tank are collected in real time and synchronously transmitted to the PLC control cabinet to form a real-time monitoring data stream; S2. The PLC control cabinet triggers a classification strategy based on the ammonia nitrogen monitoring data: if the ammonia nitrogen concentration is less than 1000 ppm, the resin tank is controlled to operate alone; if the ammonia nitrogen concentration is ≥1000 ppm, the dual resin tank series mode is automatically started, the contact time is extended, and the flow rate and operation mode are switched through the resin tank inlet and outlet solenoid valves; S3. When the turbidity after flocculation is greater than a first set value, the PLC control cabinet instructs to increase the dosage of 10% ferrous sulfate and 5% PAM, and at the same time increases the speed of the cyclone flocculation reactor; if the turbidity after magnetic separation is greater than a second set value, the backwash program is immediately triggered, the water inlet valve of the superconducting magnetic separation filter is closed, and 0.5 MPa high-pressure water is opened to backwash the magnetic medium, and the backwash water is treated recycled water to save energy; S4, the PLC control cabinet receives turbidity, ammonia nitrogen, sulfate, pH value and wastewater flow data and calculates the reagent ratio, and outputs signals to control the metering pump openings of the ammonia storage tank, sulfuric acid storage tank, ferrous sulfate storage tank, PAM storage tank, and activated carbon storage tank respectively; wherein, in the reagent ratio, ferrous sulfate 0.1-1%, PAM ≤ 0.2%, and activated carbon 0.1-0.5%; S5. The conductivity meter monitors the water quality of the treated water tank in real time. When the conductivity is greater than a third set value, the PLC control cabinet controls the reflux valve to open, and the excess water is re-directed into the cation bed tank and the anion bed tank for secondary treatment; S6. The PLC control cabinet regularly performs self-diagnosis on the sensor accuracy, metering pump flow and resin tank pressure. When an equipment abnormality is detected, it automatically alarms and switches to the backup equipment to ensure continuous and stable operation of the control system.

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