Water quality monitoring system and method
By using a water quality monitoring system to detect the ammonia content in ammonia-containing wastewater in real time and automatically adjusting the amount of steam and reagents, the problem of long detection cycles for ammonia-containing wastewater has been solved, achieving efficient water quality monitoring and energy conservation and emission reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 宝武水务科技有限公司
- Filing Date
- 2026-02-10
- Publication Date
- 2026-05-12
AI Technical Summary
The existing ammonia-containing wastewater testing cycle is long and the timeliness is poor, resulting in a lag in the adjustment of steam volume and reagent dosage, which affects production costs and energy consumption.
A water quality monitoring system is adopted, including a detection module and a control and data processing module. The system uses detection electrodes and an automatic titration unit to monitor the free ammonia and total ammonia content in the ammonia-containing wastewater in real time, and automatically adjusts the steam and reagent dosage through the automatic titration unit and control module.
Real-time monitoring of water quality parameters shortens the adjustment cycle, reduces human error, improves detection accuracy, and lowers production costs and energy consumption.
Smart Images
Figure CN122017124A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water treatment technology, and in particular to a water quality monitoring system and method. Background Technology
[0002] The residual ammonia water produced by ammonia stripping in coking is a complex, highly toxic, and difficult-to-degrade industrial wastewater. It originates during the coking process, comprising approximately 15% of the coal charged into the furnace. Its main components are free ammonia and fixed ammonium, containing small amounts of sulfides and ammonia nitrogen compounds such as ammonia and cyanide. The ammonia nitrogen concentration can reach 3-4.5 g / L, making direct biological treatment impossible. According to environmental protection requirements, the residual ammonia water must be treated before discharge. Ammonia stripping involves distilling the residual ammonia water to reduce the NH3-N content, preparing it for subsequent biological treatment. The recovered ammonia water is then used to produce ammonium sulfate. Currently, most domestic metallurgical enterprises use direct steam stripping for ammonia. This process is mature, requires low investment, and is highly reliable. However, it consumes a large amount of steam, typically 130-140 m³ of steam per cubic meter of residual ammonia water. 3 .
[0003] At present, the steam and chemical dosages are mainly optimized and adjusted based on the laboratory's manual testing results of several key indicators of ammonia-containing wastewater. However, due to the time lag of laboratory testing, which is generally greater than 24 hours, the water quality parameters used to adjust the steam and chemical dosages have become outdated, resulting in poor or even ineffective optimization and adjustment.
[0004] To alleviate the above problems, it is urgent to develop a new water quality monitoring system and method to shorten the detection cycle, improve the timeliness of detection, and adjust the steam and reagent dosage in a timely manner, thereby reducing production costs and saving energy and reducing emissions. Summary of the Invention
[0005] The purpose of this invention is to provide a water quality monitoring system and method to solve the problems of long detection cycles and poor timeliness in existing ammonia-containing wastewater testing.
[0006] To address the aforementioned technical problems, this invention provides a water quality monitoring system for monitoring the water quality of ammonia-containing wastewater, comprising:
[0007] The detection module includes a detection electrode and an automatic titration unit. The detection electrode is configured to detect the concentration of free ammonia in the water sample to be tested and convert it into a potential signal. The automatic titration unit is configured to titrate an alkaline solution into the water sample to be tested to convert fixed ammonia into free ammonia.
[0008] The control and data processing module, electrically connected to the detection module, is configured to receive the potential signal, control the start and stop of the automatic titration unit according to the received potential signal, and calculate the total free ammonia content and total ammonia content in the ammonia-evaporized wastewater according to the potential signal and the titration amount of the alkaline solution, wherein the total ammonia content includes the total content of fixed ammonia and free ammonia.
[0009] Optionally, the control and data processing module is further configured to record the initial potential of the detection electrode and then control the automatic titration unit to start titration, and to perform first-order or second-order derivatives on the potential signal, and determine the titration endpoint based on the peak point of the first-order derivative or the abrupt change point of the second-order derivative to stop the titration.
[0010] Optionally, the automatic titration unit is also configured to rapidly add liquid during the initial stage of titration and reduce the titration speed near the titration endpoint to avoid over-tipping.
[0011] Optionally, the water quality monitoring system further includes:
[0012] The pretreatment module includes a pre-filtration unit and a sampling unit. The pre-filtration unit is configured to filter the ammonia-containing wastewater to remove unexpected impurities, including oil and solid particles. The sampling unit is configured to sample the filtered ammonia-containing wastewater to obtain the water sample to be tested.
[0013] Optionally, the detection electrode includes:
[0014] An ammonia-sensitive electrode is configured to detect the concentration of free ammonia in the water sample to be tested.
[0015] Optionally, the detection electrode further includes:
[0016] A cyanide ion selective electrode is configured to detect the concentration of cyanide ions in the water sample to be tested;
[0017] A pH electrode is configured as a reference electrode and is used to measure the pH value in the water sample to be tested.
[0018] Optionally, the automatic titration unit is further configured to titrate a potassium iodide standard solution into the water sample to be tested, and the control and data processing module is further configured to calculate the total cyanide content of the ammonia-containing wastewater based on the titration amount of the potassium iodide standard solution.
[0019] Optionally, the control and data processing module is configured to obtain the free ammonia concentration in the water sample to be tested based on the initial potential of the detection electrode, and calculate the total free ammonia content in the ammonia-steaming wastewater accordingly; and to calculate the total ammonia content in the water sample to be tested based on the initial potential of the detection electrode and the titration amount of the alkaline solution, and calculate the total ammonia content in the ammonia-steaming wastewater accordingly.
[0020] The present invention also provides a water quality monitoring method, employing the water quality monitoring system described in any one of the above claims, comprising:
[0021] The ammonia-containing wastewater is filtered, and the filtered ammonia-containing wastewater is sampled to obtain a water sample to be tested.
[0022] The concentration of free ammonia in the water sample to be tested is detected, and an alkaline solution is titrated into the water sample to be tested;
[0023] The total free ammonia content and total ammonia content in the ammonia-evaporized wastewater are calculated based on the concentration of free ammonia in the water sample to be tested and the titration amount of the alkaline solution.
[0024] In summary, the present invention provides a water quality monitoring system and method. The system includes: a detection module comprising a detection electrode and an automatic titration unit, wherein the detection electrode is configured to detect the concentration of free ammonia in a water sample to be tested and convert it into a potential signal; the automatic titration unit is configured to titrate an alkaline solution into the water sample to be tested to convert fixed ammonia into free ammonia; and a control and data processing module electrically connected to the detection module, configured to receive the potential signal, control the start and stop of the automatic titration unit according to the received potential signal, and calculate the total free ammonia content and total ammonia content in the ammonia-evaporized wastewater according to the potential signal and the titration amount of the alkaline solution.
[0025] Compared with the prior art, the water quality monitoring system provided by the present invention has the following beneficial effects:
[0026] Real-time monitoring of water quality parameters significantly shortens the adjustment cycle and improves detection timeliness;
[0027] The system automatically titrates for testing, reducing human error and improving testing accuracy. Attached Figure Description
[0028] Figure 1 This is a structural block diagram of a water quality monitoring system provided in an embodiment of the present invention;
[0029] Figure 2 This is a process flow diagram of the water quality monitoring system provided in an embodiment of the present invention;
[0030] Figure 3 This is a schematic flowchart of the water quality monitoring method provided in an embodiment of the present invention;
[0031] The labels in the attached figures are explained as follows:
[0032] 1-Detection module; 2-Detection electrode; 3-Preprocessing module; 4-Control and data processing module;
[0033] Those skilled in the art will understand that the accompanying drawings are provided to better understand the invention and do not constitute any limitation on the scope of the invention. Detailed Implementation
[0034] To make the objectives, advantages, and features of the present invention clearer, the water quality monitoring system and method provided by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non-precise scales, used only to facilitate and clarify the illustration of the embodiments of the present invention. Furthermore, the structures shown in the drawings are often part of the actual structure. In particular, different figures may have different emphases and sometimes use different scales. It should be understood that relative terms such as "above," "below," "top," and "bottom" shown in the drawings can be used to describe the relationships between various elements. These relative terms are intended to cover different orientations of elements other than those depicted in the drawings. For example, if the device is inverted relative to the view in the drawings, an element described as "above" another element will now be below that element. It should also be understood that, unless specifically stated or indicated, the terms "first," "second," "third," etc., in the specification are only used to distinguish the various components, elements, steps, etc., in the specification, and are not used to indicate logical or sequential relationships between the various components, elements, steps, etc.
[0035] refer to Figure 1 As shown, this embodiment of the invention provides a water quality monitoring system for monitoring the water quality of ammonia-containing wastewater, including:
[0036] The detection module 1 includes a detection electrode 2 and an automatic titration unit. The detection electrode 2 is configured to detect the concentration of free ammonia in the water sample to be tested and convert it into a potential signal. The automatic titration unit is configured to titrate an alkaline solution into the water sample to be tested to convert fixed ammonia into free ammonia.
[0037] The control and data processing module 4 is electrically connected to the detection module 1 and is configured to receive the potential signal, control the start and stop of the automatic titration unit according to the received potential signal, and calculate the total free ammonia content and total ammonia content in the ammonia-evaporized wastewater according to the potential signal and the titration amount of the alkaline solution. The total ammonia content includes the total content of fixed ammonia and free ammonia.
[0038] The water quality testing system provided by the embodiments of the present invention can significantly shorten the adjustment cycle, improve the timeliness of testing, and the system automatically titrates for testing, reducing human error and improving testing accuracy.
[0039] The following combination Figure 2 The water quality monitoring system provided in the embodiments of the present invention will be further described.
[0040] refer to Figure 2 As shown, to prevent unexpected impurities in the ammonia-containing wastewater from affecting the water quality testing effect, as a preferred embodiment, the water quality monitoring system provided by this invention includes a pretreatment module 3. The pretreatment module 3 includes a pre-filtration unit, which is used to remove unexpected impurities from the ammonia-containing wastewater. These unexpected impurities mainly include oil molecules and solid particles. Optionally, in this embodiment, the pre-filtration unit adopts a filtration scheme combining coarse and fine filtration. The primary filtration uses coarse filtration to remove larger particles, fibers, and most of the floating oil, protecting and reducing the load on the downstream precision filter. The secondary filtration uses fine filtration to remove fine suspended solids and trace amounts of oil droplets. The primary filtration can be a scraper-type self-cleaning filter, and the secondary filtration can be a stainless steel sintered filter element. Preferably, in this embodiment, the pretreatment module 3 further includes a sampling unit, which includes a sampling probe and a sampling valve, configured to sample the filtered ammonia-containing wastewater to obtain the water sample to be tested.
[0041] It should be noted that the devices and solutions used in the pre-filtering unit and sampling unit in this embodiment do not constitute a limitation on this application, but are merely preferred examples. Other devices and solutions may also be used in some other embodiments.
[0042] In this embodiment, the detection module 1 is located inside the measurement chamber. The measurement chamber has an input channel, an output channel, and a cleaning and maintenance channel. The input channel is connected to the pretreatment module 3 via a pipeline. A pH electrode is installed inside the pipeline. This electrode is independent of the detection electrode in this embodiment and is used only to measure the pH value of the water sample to be tested. Preferably, the volume of the measurement chamber used in this embodiment is 500-550 ml. If the volume of the measurement chamber is too small, it is impossible to place a large number of detection devices inside, making it impossible to collect information such as the pH value of the water sample to be tested, resulting in inaccurate control of the titration process. Furthermore, due to the lack of information collection, the titration amount of the alkaline solution cannot be calculated. If the volume of the measurement chamber is too large, the amount of alkaline solution required for the water sample to be tested is large. Since the flow rate of the alkaline solution during titration is large, it may be impossible to accurately control the titration amount. After multiple experiments, this embodiment uses a measurement chamber with a volume of 500-550 ml, balancing both volume and measurement accuracy. The above-described method for optimizing the volume of the measuring chamber is only an example in this embodiment and does not constitute a limitation of this application.
[0043] To reduce the influence of other ions in the water sample and water turbidity during water quality testing, as a preferred embodiment of the present invention, the ammonia-sensitive electrode method is used as the basic method of the water quality monitoring system, for example, referring to... Figure 2 As shown, the detection electrode 2 includes an ammonia-sensitive electrode, which is configured to detect the ammonia concentration, i.e., the concentration of free ammonia in the water sample to be tested. Preferably, in this embodiment of the invention, the cyanide ion measurement can be performed using an anti-interference ion electrode selection method, as shown in the reference. Figure 2 As shown, the detection electrode 2 further includes a cyanide ion selective electrode and a pH electrode. When measuring free ammonia concentration and total ammonia concentration, the pH electrode is configured to detect the pH value in the water sample to determine the concentrations of NH3 and NH4 in the water sample. + The equilibrium state is used to control the titration process; when measuring the cyanide ion concentration, the cyanide ion selective electrode is configured as an indicator electrode to detect the concentration of cyanide ions in the water sample to be tested, and the pH electrode is also configured as a reference electrode to provide a constant reference potential signal. Together with the cyanide ion selective electrode and the water sample to be tested, they form a measuring cell. The content of cyanide ions in the water sample to be tested is analyzed by the potential signals of the indicator electrode and the reference electrode.
[0044] refer to Figure 1 and Figure 2 As shown, the detection module 1 in this embodiment further includes an automatic titration unit. The automatic titration unit can use a high-precision stepper motor to drive a piston pump / syringe pump, achieving a titration accuracy of 0.1 μL. The automatic titration unit can titrate an alkaline solution into the water sample to fix ammonia (NH4+).+ The alkaline solution is converted into free ammonia (NH3) through sodium hydroxide solution, i.e., through the hydroxide ions (OH-) in the sodium hydroxide solution. - ) to test the NH4 in the water sample + The NH3 is converted into H2O and NH3. NH3 can pass through the permeation membrane of the ammonia-sensitive electrode and enter the electrode, generating an electrode voltage and forming a potential signal. Furthermore, in this embodiment, the test module can control the pH of the water sample to be tested to be >11 during titration, thereby removing most of the NH4+ from the water sample. + The cyanide ion concentration is converted to NH3, reducing measurement errors. Preferably, the automatic titration unit can also titrate potassium iodide standard solution into the water sample to be tested. By titrating the potassium iodide standard solution, the concentration of cyanide ions in the water sample to be tested is changed. The cyanide ion selective electrode senses the change in the concentration of cyanide ions, and the corresponding potential signal also changes accordingly. The concentration of cyanide ions can be measured by combining the reference potential signal provided by the pH electrode.
[0045] To promote a complete reaction, a magnetic stirring rod is installed in the measuring chamber. During the titration process, the magnetic stirring rod stirs the water sample to break up the liquid stratification, so that the ions to be detected in the water sample can fully contact the titration solution and promote the reaction.
[0046] It should be noted that the devices and reagents used in the automatic titration unit described in the embodiments of the present invention do not constitute a limitation on this application, but are merely preferred examples. In some other embodiments, other devices and reagents may also be selected.
[0047] refer to Figures 1-2 As shown, the water quality monitoring system provided by the present invention further includes a control and data processing module 4, which is configured to receive the potential signal, control the start and stop of the automatic titration unit according to the received potential signal, and calculate the total free ammonia content, total ammonia content and total cyanide content in the ammonia-eating wastewater according to the potential signal and the titration amount of the alkaline solution and potassium iodide standard solution.
[0048] Preferably, the control and data processing module 4 receives and stores the initial potential of the detection electrode 2, and then controls the automatic titration unit to perform titration. During the titration process, the detection electrode 2 detects a change in the concentration of a specific substance, causing a continuous change in the potential signal. Each time a certain amount of titrant is titrated, the control and data processing module 4 records the potential signal generated by the detection electrode. A titration curve is obtained by comparing the recorded potential signals with the volume of the titrant solution. The first or second derivative of the titration curve is calculated, and the titration endpoint is determined and the titration is stopped by identifying the peak point of the first derivative or the abrupt change point of the second derivative. The control and data processing module 4 obtains the free ammonia concentration from the initial potential of the ammonia-sensitive electrode. Combined with the volume of the water sample to be tested, the total free ammonia content in the water sample can be calculated. Furthermore, combined with the volume relationship between the water sample to be tested and the ammonia-containing wastewater, the total free ammonia content in the ammonia-containing wastewater can be calculated. The calculation of the total ammonia content also requires consideration of the titration amount of the alkaline solution. The titration amount and concentration of the alkaline solution are used to determine the OH- content. - The consumption amount is used to determine the fixed ammonia, i.e., NH4. + The total ammonia content in the water sample to be tested can be obtained by combining the initial potential with the content of potassium iodide. Then, the total ammonia content in the ammonia-containing wastewater can be calculated. Referring to the above method, the total cyanide content can be calculated by combining the titration amount and concentration of the potassium iodide standard solution with the volume relationship between the water sample to be tested and the ammonia-containing wastewater.
[0049] It should be noted that the potential signal of the detection electrode 2 and the concentration of substances in the water sample to be tested are not simply linearly related. Specifically, when the volume of the water sample to be tested is too large or the ion concentration is high, the potential signal and the concentration of substances cannot be interpreted linearly. In this embodiment, the relationship between the potential signal generated by the ammonia-sensitive electrode and the concentration of ammonium ions in the water sample to be tested is called the working curve of the ammonia-sensitive electrode method. To expand the measurement range and obtain more accurate detection data, preferably, in this embodiment, ammonia standard solutions of 20, 50, 100, 200, and 500 mg / L are used, and the potential signal corresponding to each ammonia standard solution is measured. Then, curve fitting is performed using Matlab, and the free ammonia content and total ammonia content in the ammonia-containing wastewater are calculated using the working curve of the ammonia-sensitive electrode method obtained after fitting. The above optimization method of the working curve of the ammonia-sensitive electrode method is only an example in this embodiment and does not constitute a limitation of this application.
[0050] Preferably, the automatic titration unit in this embodiment supports a dynamic titration mode to improve work efficiency and titration accuracy. The dynamic titration mode is configured as follows: in the initial stage of titration, the automatic titration unit rapidly adds liquid to the water sample to be tested, thereby accelerating the reaction and shortening the detection cycle; and when approaching the titration endpoint, the titration speed is reduced to avoid over-tipping and resulting detection errors.
[0051] After the measurement is completed, the water quality monitoring system discharges the water sample to be tested from the measurement chamber through the output channel, and rinses the inside of the measurement chamber through the cleaning and maintenance channel. After cleaning, the subsequent testing of ammonia-containing wastewater can be carried out.
[0052] As an example, the water quality monitoring system described in this embodiment is also equipped with a video monitoring module. The video captures the overall operating status of the equipment in real time and transmits it to a designated client via a 5G network, providing technical support for unmanned inspections by operators.
[0053] refer to Figure 3 As shown in the figure, this embodiment of the invention also provides a water quality monitoring method, which uses the water quality monitoring system provided in this embodiment and includes the following steps:
[0054] S1, the ammonia-containing wastewater is filtered, and the filtered ammonia-containing wastewater is sampled to obtain a water sample to be tested;
[0055] S2, detect the concentration of free ammonia in the water sample to be tested, and titrate an alkaline solution into the water sample to be tested;
[0056] S3, calculate the total free ammonia content and total ammonia content in the ammonia-evaporized wastewater based on the concentration of free ammonia in the water sample to be tested and the titration amount of the alkaline solution.
[0057] In summary, this invention provides a water quality testing system and method. The system includes: a detection module comprising a detection electrode and an automatic titration unit. The detection electrode is configured to detect the concentration of free ammonia in a water sample and convert it into a potential signal. The automatic titration unit is configured to titrate an alkaline solution into the water sample to convert fixed ammonia into free ammonia. A control and data processing module is electrically connected to the detection module and configured to receive the potential signal, control the start and stop of the automatic titration unit based on the received potential signal, and calculate the total free ammonia content and total ammonia content in the ammonia-containing wastewater based on the potential signal and the titration amount of the alkaline solution. This system provides real-time water quality monitoring, solving the problems of long testing cycles and poor timeliness in existing ammonia-containing wastewater testing methods. Furthermore, automation reduces human error and improves detection accuracy.
[0058] It should be noted that the above description is only a description of the preferred embodiment of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present invention.
Claims
1. A water quality monitoring system for monitoring the water quality of ammonia-containing wastewater, characterized in that, include: The detection module includes a detection electrode and an automatic titration unit. The detection electrode is configured to detect the concentration of free ammonia in the water sample to be tested and convert it into a potential signal. The automatic titration unit is configured to titrate an alkaline solution into the water sample to be tested to convert fixed ammonia into free ammonia. The control and data processing module, electrically connected to the detection module, is configured to receive the potential signal, control the start and stop of the automatic titration unit according to the received potential signal, and calculate the total free ammonia content and total ammonia content in the ammonia-evaporized wastewater according to the potential signal and the titration amount of the alkaline solution, wherein the total ammonia content includes the total content of fixed ammonia and free ammonia.
2. The water quality monitoring system according to claim 1, characterized in that, The control and data processing module is also configured to record the initial potential of the detection electrode and then control the automatic titration unit to start titration, and to perform first-order or second-order differentiation on the potential signal, and determine the titration endpoint based on the peak point of the first-order differentiation or the abrupt change point of the second-order differentiation to stop titration.
3. The water quality monitoring system according to claim 1, characterized in that, The automatic titration unit is also configured to rapidly add liquid during the initial stage of titration and reduce the titration speed near the titration endpoint to avoid over-tipping.
4. The water quality monitoring system according to claim 1, characterized in that, The water quality monitoring system also includes: The pretreatment module includes a pre-filtration unit and a sampling unit. The pre-filtration unit is configured to filter the ammonia-containing wastewater to remove unexpected impurities, including oil and solid particles. The sampling unit is configured to sample the filtered ammonia-containing wastewater to obtain the water sample to be tested.
5. The water quality monitoring system according to claim 1, characterized in that, The detection electrode includes: An ammonia-sensitive electrode is configured to detect the concentration of free ammonia in the water sample to be tested.
6. The water quality monitoring system according to claim 1, characterized in that, The detection electrode further includes: A cyanide ion selective electrode is configured to detect the concentration of cyanide ions in the water sample to be tested; A pH electrode is configured as a reference electrode and is used to measure the pH value in the water sample to be tested.
7. The water quality monitoring system according to claim 6, characterized in that, The automatic titration unit is further configured to titrate a potassium iodide standard solution into the water sample to be tested, and the control and data processing module is further configured to calculate the total cyanide content of the ammonia-containing wastewater based on the titration amount of the potassium iodide standard solution.
8. The water quality monitoring system according to claim 1, characterized in that, The control and data processing module is configured to obtain the free ammonia concentration in the water sample to be tested based on the initial potential of the detection electrode, and calculate the total free ammonia content in the ammonia-evaporized wastewater accordingly; and to calculate the total ammonia content in the water sample to be tested based on the initial potential of the detection electrode and the titration amount of the alkaline solution, and calculate the total ammonia content in the ammonia-evaporized wastewater accordingly.
9. A water quality monitoring method, employing the water quality monitoring system according to any one of claims 1 to 8, characterized in that, include: The ammonia-containing wastewater is filtered, and the filtered ammonia-containing wastewater is sampled to obtain a water sample to be tested. The concentration of free ammonia in the water sample to be tested is detected, and an alkaline solution is titrated into the water sample to be tested; The total free ammonia content and total ammonia content in the ammonia-evaporized wastewater are calculated based on the concentration of free ammonia in the water sample to be tested and the titration amount of the alkaline solution.