A supervisory water quality monitoring device

Abstract

This utility model discloses a supervised water quality monitoring device, including a monitoring and control device, an intermittent water quality sensor, a sampling device, and several continuous water quality sensors. The continuous water quality sensors are installed at each monitoring point in the wastewater treatment system, and the output of each continuous water quality sensor is connected to the monitoring and control device, establishing a water quality monitoring network. The sampling device is installed between each monitoring point and the intermittent water quality sensor, and the output of the intermittent water quality sensor is interconnected with the monitoring and control device, establishing a water quality monitoring network. Through the above methods, this utility model can ensure the data foundation of the intelligent water system, providing real-time and reliable water quality data for intelligent control.

Description

Technical Field

[0001] This utility model relates to the field of intelligent water systems, and in particular to a supervisory water quality monitoring device. Background Technology

[0002] Water quality sensors are the core hardware foundation for the effective operation of smart water systems. Currently, water quality monitoring sensors fall into two main categories: continuous sensors, such as immersion probes for DO and pH, which can detect current water quality data in real time; and intermittent sensors, such as those using chemical methods for online detection of COD, TN, and TP. Each of these two categories of water quality sensors has its own advantages and disadvantages.

[0003] 1) Intermittent water quality sensor: It has high detection accuracy, but its operation requires continuous consumption of chemicals and consumables, resulting in high operation and maintenance costs. Its intermittent monitoring also restricts the real-time control of the intelligent water system, making it unable to respond to changes in water quality in a timely manner. This is especially true in water treatment systems with large fluctuations in water quality and short hydraulic retention times, where the adverse effects on control are particularly evident.

[0004] 2) Continuous water quality sensor: It has real-time monitoring capabilities, but it is greatly affected by the water quality environment and lacks long-term stability. Due to water quality interference, aging, corrosion, and insufficient maintenance, data drift and deviation occur. This poses a challenge to the stability and reliability of control.

[0005] In view of the shortcomings of current water quality sensors in terms of real-time performance or stability, and the difficulty in achieving both real-time performance and stability, there is an urgent need to provide a new type of supervised water quality monitoring device to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a supervisory water quality monitoring device to ensure the data foundation of the intelligent water system and provide real-time and reliable water quality data for intelligent control.

[0007] To solve the above-mentioned technical problems, the present invention provides a technical solution: a supervised water quality monitoring device, including a monitoring and control device, an intermittent water quality sensor, a sampling device, and several continuous water quality sensors;

[0008] The continuous water quality sensor is installed at each monitoring point in the wastewater treatment system, and the output of each continuous water quality sensor is connected to a monitoring and control device to establish a water quality monitoring network.

[0009] The sampling device is installed between each monitoring point and the intermittent water quality sensor. The output of the intermittent water quality sensor is connected to the monitoring and control device to establish a water quality monitoring network.

[0010] In a preferred embodiment of the present invention, the sampling device includes a sampling pump, a sampling tube, and a pretreatment water tank disposed at each monitoring point. One end of the sampling tube is connected to the sampling pump, and the other end is connected to the pretreatment water tank. The output end of the pretreatment water tank is connected to an intermittent water quality sensor.

[0011] In a preferred embodiment of this invention, the water sample prepared by the sampling device is transported to one or more intermittent water quality sensors for detection.

[0012] In a preferred embodiment of this invention, the probe of the continuous water quality sensor is inserted into the sewage at the monitoring point for detection.

[0013] In a preferred embodiment of this utility model, the continuous water quality sensor is connected to the monitoring and control device via a communication cable.

[0014] In a preferred embodiment of this utility model, the intermittent water quality sensor monitors 2-5 monitoring points.

[0015] In a preferred embodiment of this invention, the minimum monitoring cycle of the intermittent water quality sensor is not less than 0.5 hours.

[0016] In a preferred embodiment of this utility model, the water quality monitoring network and the water quality supervision network correspond one-to-one in terms of water quality monitoring indicators.

[0017] The beneficial effects of this utility model are: This utility model uses two types of water quality sensors to establish a water quality monitoring network and a supervision network respectively, and establishes a supervision-type water quality monitoring device, so that water quality monitoring has the advantages of real-time performance of continuous water quality sensors and accuracy of intermittent water quality sensors at the same time, while avoiding the disadvantages of both, and significantly reducing the operation and maintenance costs of water quality monitoring. Attached Figure Description

[0018] Figure 1 This is a structural block diagram of a preferred embodiment of the supervisory water quality monitoring device of this utility model.

[0019] The components in the attached diagram are labeled as follows: 1. Wastewater treatment system, 2. Continuous water quality sensor, 3. Communication cable, 4. Sampling pump, 5. Sampling tube, 6. Liquid level line. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0021] Please see Figure 1 The embodiments of this utility model include:

[0022] A supervised water quality monitoring device includes a monitoring and control device, an intermittent water quality sensor, a sampling device, and several continuous water quality sensors 2.

[0023] The continuous water quality sensor 2 is installed at each monitoring point of the wastewater treatment system 1. The output of each continuous water quality sensor 2 is connected to the monitoring and control device through a communication cable 3 to establish a water quality monitoring network. The sampling device is installed between each monitoring point and the intermittent water quality sensor. The output of the intermittent water quality sensor is connected to the monitoring and control device to establish a water quality supervision network.

[0024] The sampling device includes a sampling pump 4, a sampling tube 5, and a pretreatment water tank at each monitoring point. One end of the sampling tube 5 is connected to the sampling pump 4, and the other end is connected to the pretreatment water tank. The output end of the pretreatment water tank is connected to an intermittent water quality sensor. Each monitoring point in the monitoring network is equipped with one sampling device. Water samples prepared by each sampling device can be transported to one or more intermittent water quality sensors for testing. Preferably, one intermittent water quality sensor monitors 2-5 monitoring points. The sampling device of the continuous water quality sensor 2 operates continuously, while the sampling device of the intermittent water quality sensor operates intermittently. Both can share a single sampling device at the same monitoring point. The pretreatment water tank pretreats the water samples through sedimentation, media filtration, or a combination of both.

[0025] The water quality monitoring network and the water quality supervision network are one-to-one correspondences in terms of water quality monitoring indicators. For example, the monitoring points for COD in water quality correspond to the water quality monitoring of continuous COD sensors and the monitoring and supervision of intermittent COD sensors.

[0026] The continuous water quality sensor 2 monitors water quality continuously using methods such as spectroscopy or electrode methods, providing continuous and real-time water quality data to the intelligent water system to meet the real-time control requirements.

[0027] Furthermore, the continuous water quality sensor 2 performs on-site detection at the water quality monitoring point. During on-site detection, depending on the water quality environment, the water sample can be processed on-site by a sampling device before detection, or the sensor probe can be directly inserted below the sewage level line 6 at the monitoring point for detection.

[0028] The intermittent water quality sensor performs intermittent detection through methods such as chemical detection, providing a monitoring function to the water quality monitoring network to ensure the reliability and stability of water quality monitoring data.

[0029] Furthermore, the minimum monitoring cycle of the intermittent water quality sensor is no less than 0.5 hours. The operating conditions of the intermittent water quality sensor are determined by the monitoring and control system based on data analysis.

[0030] The monitoring and control system consists of a control program and communication hardware and software. It processes and analyzes the monitoring data from the continuous water quality sensor 2 and the intermittent water quality sensor, providing the water quality monitoring system with functions such as deviation monitoring, deviation compensation, replacement, calibration, and early warning. Specifically:

[0031] The deviation monitoring function refers to the periodic sampling and monitoring by the intermittent water quality sensor, which compares and analyzes the monitoring data with that of the continuous water quality sensor 2 to track the changes in the detection deviation between the continuous water quality sensor 2 and the intermittent water quality sensor.

[0032] The aforementioned deviation compensation function refers to the process of correcting the monitoring data by analyzing the data when a systematic drift or deviation is detected in the data from the continuous water quality sensor 2.

[0033] The backup function refers to the activation of the intermittent water quality sensor when abnormal or erroneous data is detected in the continuous water quality sensor 2, temporarily replacing the continuous water quality sensor 2 for water quality monitoring.

[0034] The calibration function refers to calibrating the continuous water quality sensor 2 using the detection data from the intermittent water quality sensor.

[0035] The warning function includes warnings of deviation changes in the water quality continuous sensor 2 and warnings of abnormal data.

[0036] Taking the COD monitoring of a wastewater treatment plant throughout its entire process as an example. (See below.) Figure 1 As shown, monitoring points are set up at the end of the pretreatment stage, the end of the biological aeration tank, and the end of the advanced treatment process in the wastewater treatment flow, totaling three monitoring points. At each of these monitoring points, one water quality COD spectrometer (continuous water quality sensor) is installed to achieve real-time monitoring of water COD. Simultaneously, at each of these monitoring points, one sampling pump (submersible pump, 3-4 m³ / h) is installed. Water samples extracted by each pump are processed in a pretreatment tank (shared by all three monitoring points) before being sent to a water quality COD chemical method analyzer (intermittent water quality sensor) for measurement. The monitoring and control device is equipped with central control software that, through network connectivity, acquires monitoring data from the COD spectrometer and the COD chemical method analyzer, processes the data, and issues operating commands to the monitoring and control device.

[0037] The monitoring and control system is set to take samples and monitor each monitoring point every 5 days using a chemical COD analyzer. The monitoring results are then compared with the data from a COD spectrometer at the same time. The deviation is analyzed; if the deviation is within a reasonable range, the data at that monitoring point is normal. If the deviation increases or decreases, deviation compensation is activated to correct the COD spectrometer's monitoring data, or the calibration function is activated to calibrate the COD spectrometer so that its monitoring data returns to normal values.

[0038] When abnormal fluctuations are detected in the COD spectrometer monitoring data, an early warning signal is sent, and the COD chemical method analyzer is activated to verify the data fluctuations. If the verification result is true, it indicates that the data fluctuations are real, and a water quality impact warning is further sent. If the verification result is false, it indicates that the data fluctuations are spurious, and an instrument maintenance warning is further sent.

[0039] The supervisory water quality monitoring device of this invention achieves real-time COD monitoring while ensuring the accuracy and reliability of COD monitoring data. It also saves on reagent consumption and maintenance costs. Traditional online COD detection using chemical methods requires one instrument to monitor once per hour, 24 times per day, and three instruments for 5 days, totaling 360 monitoring times. In this embodiment, one online COD detector monitors three monitoring points once every 5 days, resulting in a total of 3 deviation monitoring times. Adding the 15 anomaly verification monitoring times (conservatively estimated at once per monitoring point per day), the total number of monitoring times is 18. This estimates a 95% saving on reagents. Even if traditional online COD detection were performed every 2 hours, a 90% saving on reagents would still be achieved.

[0040] This embodiment only takes COD monitoring as an example. For other water quality monitoring indicators (such as ammonia nitrogen), the monitoring network and supervision network can also be designed and arranged according to the supervisory water quality monitoring device of this utility model. Then, through data analysis and preprocessing of the monitoring and control device, the real-time performance, reliability and accuracy of water quality monitoring can be achieved.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A supervisory water quality monitoring device, characterized in that, Includes monitoring and control devices, intermittent water quality sensors, sampling devices, and several continuous water quality sensors; The continuous water quality sensor is installed at each monitoring point in the wastewater treatment system, and the output of each continuous water quality sensor is connected to a monitoring and control device to establish a water quality monitoring network. The sampling device is installed between each monitoring point and the intermittent water quality sensor. The output of the intermittent water quality sensor is connected to the monitoring and control device to establish a water quality monitoring network.

2. The supervised water quality monitoring device according to claim 1, characterized in that, The sampling device includes a sampling pump, a sampling tube, and a pretreatment water tank installed at each monitoring point. One end of the sampling tube is connected to the sampling pump, and the other end is connected to the pretreatment water tank. The output end of the pretreatment water tank is connected to an intermittent water quality sensor.

3. The supervised water quality monitoring device according to claim 1, characterized in that, The water sample prepared by the sampling device is transported to one or more intermittent water quality sensors for detection.

4. The supervised water quality monitoring device according to claim 1, characterized in that, The probe of the continuous water quality sensor is inserted into the sewage at the monitoring point for detection.

5. The supervised water quality monitoring device according to claim 1, characterized in that, The continuous water quality sensor is connected to the monitoring and control device via a communication cable.

6. The supervised water quality monitoring device according to claim 1, characterized in that, The intermittent water quality sensor monitors 2-5 monitoring points.

7. The supervised water quality monitoring device according to claim 1, characterized in that, The minimum monitoring cycle of the intermittent water quality sensor is no less than 0.5 hours.

8. The supervised water quality monitoring device according to claim 1, characterized in that, The water quality monitoring network and the water quality supervision network are in one-to-one correspondence in terms of water quality monitoring indicators.

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