Waste liquid monitoring method and system

Abstract

The invention discloses a waste liquid monitoring method and system. The method comprises the following steps: acquiring the variation of the waste liquid storage amount on the current day, the first waste liquid generation amount on the current day and the waste liquid outflow amount on the current day; treating the variable quantity of the waste liquid storage quantity of the current day and the waste liquid outflow quantity of the current day to obtain a second waste liquid generation quantity of the current day; when the difference value between the first waste liquid generation amount and the second waste liquid generation amount is larger than a first threshold value, alarm information is generated. By utilizing the method, the problems that the measurement data is seriously distorted and the generation, storage and outflow conditions of the waste liquid cannot be truly reflected due to long-term error accumulation of the measurement data caused by abnormal operation can be avoided; besides, whether data abnormity occurs or not is determined by comparing the waste liquid output calculated in different modes, abnormity reasons of multiple dimensions can be reflected, and then the dynamic accuracy and credibility of the waste liquid monitoring data can be kept all the time.

Description

Technical Field

[0001] This invention relates to the field of automation technology, and in particular to a waste liquid monitoring method and system. Background Technology

[0002] In chemical production, there are situations where self-utilization / disposal facilities (such as incinerators) are established for the liquid hazardous waste generated during the production process. However, the following problems exist in the process of self-utilization and disposal of liquid hazardous waste: data anomalies may occur between the inflow and outflow volumes and the storage volume of waste liquid due to pipeline leaks, recording errors, etc., and existing monitoring systems cannot detect and issue timely warnings; existing monitoring methods are insufficient to automatically and comprehensively and accurately track waste liquid data from different flow directions, failing to meet the needs of refined management. Summary of the Invention

[0003] This invention provides a waste liquid monitoring method and system to address at least one deficiency in the prior art.

[0004] In a first aspect, embodiments of the present invention provide a waste liquid monitoring method, comprising:

[0005] Obtain the daily change in waste liquid storage volume, the daily first waste liquid generation volume, and the daily waste liquid outflow volume;

[0006] The change in the daily waste liquid storage volume and the daily waste liquid outflow volume are processed to obtain the daily second waste liquid generation volume;

[0007] An alarm message is generated when the difference between the first waste liquid generation and the second waste liquid generation exceeds a first threshold.

[0008] Wherein, the change in waste liquid storage volume represents the difference between the waste liquid storage volume in the storage tank at the first preset time on the current day and the waste liquid storage volume in the storage tank at the first preset time on the previous day;

[0009] The first waste liquid generation amount represents the total amount of waste liquid that flows into the storage tank from the second preset time to the first preset time on the same day;

[0010] The waste liquid outflow represents the total amount of waste liquid that flows out of the storage tank from the second preset time to the first preset time on the same day.

[0011] Optionally, the method further includes:

[0012] The amount of waste liquid transferred between the two storage tanks is obtained, and it is determined whether the amount of waste liquid transferred between the two storage tanks is greater than a second threshold. If so, a stop waste liquid transfer control command is generated and sent to the waste liquid transfer control device. The amount of waste liquid transferred between the two storage tanks represents the difference in the amount of waste liquid transferred between the two storage tanks.

[0013] Alternatively, the method may further include: acquiring a pressure measurement value of the transmission pipeline and determining whether the pressure measurement value is greater than a third threshold; if so, generating a stop transfer control command and sending it to the transfer control device.

[0014] Optionally, the method further includes: obtaining the liquid level change rate of the storage tank; calculating the transfer volume using the liquid level change rate; determining the transfer mass using the transfer volume, and determining whether the transfer mass is greater than a fourth threshold; if so, generating a stop transfer control command and sending it to the transfer control device.

[0015] Optionally, determining the canning mass using the canning volume includes:

[0016] Obtain the coefficient of thermal expansion, current temperature, preset temperature, waste liquid density at the preset temperature, and waste liquid density at the preset temperature;

[0017] Calculate the difference between the current temperature and the preset temperature to obtain the temperature difference;

[0018] The waste liquid density at the preset temperature is corrected based on the temperature difference and the coefficient of thermal expansion to obtain the waste liquid density at the current temperature.

[0019] The mass of the waste liquid is obtained by multiplying the density of the waste liquid at the current temperature by the volume of the transfer tank.

[0020] Optionally, the daily waste liquid outflow includes a first waste liquid outflow and a second waste liquid outflow; the first waste liquid outflow represents the total amount of waste liquid flowing from the storage tank into the first waste liquid treatment device from the second preset time to the first preset time on the same day; the second waste liquid outflow represents the total amount of waste liquid flowing from the storage tank into the second waste liquid treatment device from the second preset time to the first preset time on the same day.

[0021] The change in the daily waste liquid storage volume and the daily waste liquid outflow volume are processed to obtain the daily second waste liquid generation volume, including:

[0022] Calculate the difference between the first waste liquid storage volume of the current day and the second waste liquid storage volume of the previous day to obtain the current waste liquid storage volume;

[0023] The second waste liquid generation amount is obtained by weighted summing of the current waste liquid storage amount, the first waste liquid outflow amount on the same day, and the second waste liquid outflow amount on the same day.

[0024] Optionally, the change in waste liquid storage volume for the day can be obtained, including:

[0025] Obtain the liquid level and temperature measurements of the storage tank for the day; determine the waste liquid density for the day using a density-temperature curve based on the temperature measurement for the day; determine the first waste liquid storage volume based on the waste liquid density and the liquid level measurement of the storage tank for the day.

[0026] Obtain the liquid level and temperature measurements of the storage tank from the previous day; determine the waste liquid density of the previous day using the density-temperature curve based on the temperature measurement of the previous day; determine the second waste liquid storage volume based on the waste liquid density of the previous day and the liquid level measurement of the storage tank from the previous day.

[0027] Calculate the difference between the first waste liquid storage volume and the second waste liquid storage volume to obtain the change in the waste liquid storage volume on that day.

[0028] Optionally, the method further includes:

[0029] The daily amount of first waste liquid generated, the daily amount of waste liquid discharged, and the daily amount of waste liquid stored are stored in the database.

[0030] According to the storage tank number and / or the type of waste liquid, the daily first waste liquid generation, the daily waste liquid outflow, and the daily waste liquid storage are classified and summarized to form a statistical table and displayed.

[0031] Upon receiving the export instruction, the statistical table is exported.

[0032] Secondly, embodiments of the present invention also provide a waste liquid monitoring system, the waste liquid monitoring system including a controller, the controller being used to execute any of the waste liquid monitoring methods described in the embodiments of the present invention.

[0033] Optionally, the waste liquid monitoring system further includes at least two storage tanks, a number of first sensors, a number of second sensors, and a number of third sensors; all of the first sensors to the third sensors are communicatively connected to the controller.

[0034] The first sensor is disposed on at least one of the tank bodies of the liquid storage tank, the second sensor is disposed on at least one waste liquid inlet end of the liquid storage tank, and the third sensor is disposed on at least one waste liquid outlet end of the liquid storage tank;

[0035] The measurement data from the first sensor is used to determine the change in the amount of waste liquid stored, the measurement data from the second sensor is used to determine the amount of first waste liquid generated, and the measurement data from the third sensor is used to determine the amount of waste liquid discharged.

[0036] Optionally, the waste liquid monitoring system further includes a fourth sensor, which is installed on the transmission pipeline connecting the two storage tanks, and the measurement data of the fourth sensor is used to determine the amount of liquid transferred.

[0037] And / or, the waste liquid monitoring system further includes a tank-switching control device, which includes a solenoid valve or a conveying device. The solenoid valve and the conveying device are both installed on the transmission pipeline connecting the two storage tanks, and the solenoid valve and the conveying device are both communicatively connected to the controller.

[0038] When the amount of water poured exceeds the second threshold, the controller generates a stop water pouring control command and sends it to the solenoid valve to close the solenoid valve, and / or the controller generates a stop water pouring control command and sends it to the conveying device to close the solenoid valve and stop the conveying device.

[0039] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention proposes a waste liquid monitoring method. This method acquires multiple sets of data, including changes in waste liquid storage volume, the first waste liquid generation volume, and the waste liquid outflow volume, and calculates the second waste liquid generation volume separately, comparing it with the first waste liquid generation volume. When the difference between the two exceeds a first threshold, an alarm message is generated. This avoids the problem in actual waste liquid treatment where errors in measurement data accumulate over a long period due to abnormal operations (such as pipeline leaks, illegal discharges, incorrect opening or closing of valves, etc.), causing serious distortion of the measurement data and making it unable to accurately reflect the generation, storage, and outflow of waste liquid.

[0040] In addition, by comparing the waste liquid generation calculated in different ways to determine whether there are data anomalies, it is possible to reflect the causes of anomalies in multiple dimensions. Whether it is data deviation caused by instrument failure or data anomalies caused by abnormal operation, they can be detected and dealt with in the first time. This can ensure that the waste liquid monitoring data always maintains dynamic accuracy and reliability, and provide reliable data support for enterprises' production management, environmental compliance, cost accounting, etc. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the waste liquid monitoring system provided by the present invention;

[0042] Figure 2 This is another structural schematic diagram of the waste liquid monitoring system provided by the present invention;

[0043] Figure 3 This is a schematic flowchart of the waste liquid monitoring method provided by the present invention;

[0044] Figure 4 This is another schematic diagram of the waste liquid monitoring method provided by the present invention;

[0045] Figure 5 This is another schematic diagram of the waste liquid monitoring method provided by the present invention;

[0046] Figure 6 This is another schematic diagram of the waste liquid monitoring method provided by the present invention;

[0047] Figure 7 This is another schematic diagram of the waste liquid monitoring method provided by the present invention. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] Please see Figure 1 , Figure 1 This is a schematic diagram of the waste liquid monitoring system provided by the present invention. The waste liquid monitoring system includes a controller 100 and a sensor 300. The controller 100 is connected to the tank-turning control device 200 and the sensor 300 respectively.

[0050] In this embodiment, the controller 100, the tank-switching control device 200, and the sensor 300 can be included in the liquid hazardous waste treatment system.

[0051] The liquid hazardous waste treatment system also includes storage tanks. These tanks are used to store liquid hazardous waste to ensure the continuity of subsequent treatment processes.

[0052] The tank transfer control device 200 may include equipment such as pumps, valves (e.g., solenoid valves) or pipelines, which, in conjunction with the pumps, valves or pipelines, can transport the liquid hazardous waste in the storage tank to the treatment equipment (not shown in the figure).

[0053] The treatment equipment is used to pretreat liquid hazardous waste, which may include filtration, pH adjustment, dilution, etc.

[0054] After pretreatment, the treatment equipment uses chemical reactions to convert harmful substances in the liquid hazardous waste into harmless or less harmful substances. These chemical reactions can include oxidation-reduction reactions, neutralization reactions, and precipitation reactions.

[0055] The processing equipment can also be used to separate the reaction products to obtain processed liquid products and solid or gaseous byproducts. Separation methods can include filtration, centrifugation, distillation, extraction, etc.

[0056] The treatment equipment can also be used to treat the waste gas generated during the reaction process, ensuring it meets emission standards before being released into the atmosphere. Waste gas treatment methods can include absorption, adsorption, and catalytic oxidation.

[0057] In this embodiment, the waste liquid monitoring system is used to monitor and control the storage tank in real time. In the waste liquid monitoring system, the sensor 300 is used to monitor various parameters of the storage tank, such as temperature, pressure, flow rate, liquid level, pH value, etc., and transmit these signals to the controller 100. The controller 100 automatically adjusts the operating status of related equipment according to the preset parameter values ​​and the signals fed back by the sensor, such as adjusting the valve opening, controlling the pump speed, starting or stopping the heating and cooling device, etc.

[0058] The controller 100 can also be configured with data logging and alarm functions, which can record system operation data for subsequent analysis and query. When the system malfunctions, it can promptly issue an alarm signal to notify the operator for handling.

[0059] As one possible implementation, the liquid hazardous waste treatment system may include at least two storage tanks, and the waste liquid monitoring system may include a number of first sensors, a number of second sensors, and a number of third sensors.

[0060] The first sensor is installed on the body of at least one storage tank, the second sensor is installed at least at the waste liquid inlet of one storage tank, and the third sensor is installed at least at the waste liquid outlet of one storage tank.

[0061] The measurement data from the first sensor is used to determine the change in the amount of waste liquid stored, the measurement data from the second sensor is used to determine the amount of first waste liquid generated, and the measurement data from the third sensor is used to determine the amount of waste liquid discharged.

[0062] For example, in this embodiment, the first sensor can be a level gauge, an ultrasonic sensor, etc., and the second and third sensors can be mechanical flow meters, electromagnetic flow meters, ultrasonic flow meters, etc.

[0063] Furthermore, while mechanical flow meters can record instantaneous flow, electromagnetic or ultrasonic flow meters inherently support cumulative flow recording and possess higher anti-interference capabilities and long-term stability. Electromagnetic flow meters directly output cumulative flow data by measuring the flow velocity of conductive liquids, meeting data integration requirements without additional modifications, while reducing errors caused by mechanical wear.

[0064] In this embodiment, the first to the third sensors are all communicatively connected to the controller 100. The controller 100 can be a DCS (Distributed Control System) controller with SCADA (Supervisory Control and Data Acquisition).

[0065] In this embodiment, the controller 100 is configured to record the instantaneous measurement records of the first sensor to the third sensor, as well as the cumulative measurement records over 24 hours.

[0066] In this embodiment, the flow meter itself can be used to accumulate and record flow data (e.g., using an electromagnetic flow meter or an ultrasonic flow meter), or the flow data can be accumulated and recorded by combining the controller 100 and the mechanical flow meter through software improvements.

[0067] In this embodiment, by recording the cumulative measurement data over 24 hours, the problem that most flow meters currently used by relevant enterprises use instantaneous flow recording and do not have cumulative flow recording can be solved.

[0068] refer to Figure 2 , Figure 2 This is another structural schematic diagram of the waste liquid monitoring system provided by the present invention. The liquid hazardous waste treatment system includes a storage tank A, a storage tank B and sensors. The sensors include a first sensor 11-12, a second sensor 21-22, a third sensor 31-34 and a fourth sensor 4.

[0069] In this embodiment, the second sensor 21 is used to record the flow rate at the waste liquid inlet of storage tank A, and the second sensor 22 is used to record the flow rate at the waste liquid inlet of storage tank B.

[0070] The third sensor 31 is used to record the flow rate at the first waste liquid outlet of storage tank A, and the third sensor 34 is used to record the flow rate at the second waste liquid outlet of storage tank B.

[0071] The third sensor 32 is used to record the flow rate at the third waste liquid outlet of storage tank A, and the third sensor 33 is used to record the flow rate at the fourth waste liquid outlet of storage tank B.

[0072] In this embodiment, the first waste liquid outlet and the second waste liquid outlet are connected to the outsourced transfer device; the third waste liquid outlet and the fourth waste liquid outlet are connected to the self-utilization / disposal device.

[0073] In this embodiment, the first to third sensors and the controller constitute a DCS system. The controller can use the relevant recorded data from all the sensors to create the following integrated table.

[0074]

[0075] In the table above, the first waste liquid generation (i.e., daily generation) refers to the actual amount of waste liquid entering the tank from 00:00:00 to 23:59:59 (sourced from the sum of data from the second sensor 21 and the second sensor 22). Specifically, in this scheme, the cumulative flow data of the second sensors 21 and 22 from 00:00:00 to 23:59:59 daily are calculated to determine the first waste liquid generation, denoted as F1.

[0076] The waste liquid storage volume (i.e., daily tank inventory) refers to the storage volume in the hazardous waste storage tank as of 23:59:59 (sourced from the sum of data from the first sensor 11 and the first sensor 12). Specifically, the first waste liquid storage volume for the day is obtained and stored using the data from level gauges 51 and 52 as of 23:59:59; the waste liquid storage volume of the previous day as of 23:59:59 is retrieved from the memory as the second waste liquid storage volume.

[0077] The first waste liquid outflow (i.e., daily self-utilization / disposal volume) refers to the self-utilization / disposal volume of hazardous waste from 00:00:00 to 23:59:59 (sourced from the sum of data from the third sensor 32 and the third sensor 33). Specifically, the first waste liquid outflow is obtained using the cumulative flow data from the third sensor 32 and the third sensor 33 from 00:00:00 to 23:59:59 daily.

[0078] The second wastewater outflow (i.e., daily outsourced transfer volume) refers to the outsourced transfer volume of hazardous waste to the outside of the plant boundary from 00:00:00 to 23:59:59 (sourced from the sum of data from the third sensor 31 and the third sensor 34). Specifically, the second wastewater outflow volume is obtained using the cumulative flow data from the third sensor 31 and the third sensor 34 from 00:00:00 to 23:59:59 daily.

[0079] In this embodiment, the sensors and controller are configured to record cumulative measurement data over 24 hours, and all liquid level and flow data are integrated into the DCS / SCADA system to achieve automatic data acquisition and integration. This system avoids the problem in existing technologies where flow meters only record instantaneous flow, leading to inaccurate daily total flow statistics.

[0080] The integrated table improves regulatory compliance and management efficiency, addressing the issue that existing technologies, due to incomplete data recording, struggle to meet the stringent regulatory requirements of environmental protection departments. Through fully automated recording and integration, key data such as daily generation, disposal, and outsourced transfer volumes are ensured to be real-time verifiable and tamper-proof. The integrated table can also include an "annual cumulative generation" feature, automatically generated from daily generation data, which can be directly used in annual reports, avoiding errors from manual aggregation.

[0081] This implementation, through systematic improvements to the technical solution, addresses issues such as fragmented data recording, high reliance on manual intervention, and significant error risks inherent in existing technologies. It not only enhances data accuracy and operational security but also provides comprehensive technical support for efficient enterprise management, compliant operations, and risk control through the integration of automation and intelligence.

[0082] In existing technologies, the outsourced transfer volume and the amount of water transferred rely on manual recording or estimation, which are easily affected by operational errors. In this embodiment, the cumulative data from sensors 11 and 12 can be directly used to calculate the daily output, avoiding the tediousness and errors of manually recording instantaneous flow rates. The addition of sensors 21 and 22 enables fully automated measurement of the outsourced transfer volume throughout the entire process.

[0083] In this embodiment, a DCS / SCADA system is used to automatically generate an integrated table, summarizing key data such as the amount of waste entering, the amount of waste in each tank, and the amount of waste disposed of in real time. This solves the problem of data isolation in existing technologies, improves the completeness and timeliness of data recording, and provides a reliable basis for enterprise production analysis and regulatory department verification. It enables enterprises to clearly distinguish between normal operations and emergency adjustments, further enhancing regulatory transparency. This embodiment also improves the current recording method for multiple liquid hazardous waste storage tanks with their own utilization / disposal facilities. The technology in this embodiment accurately reflects the enterprise's production status, which is more conducive to the enterprise's production data analysis and supply management.

[0084] In this embodiment, the integrated table is automatically generated by the DCS / SCADA system, which can solve the problem that data such as liquid level and flow rate are displayed locally in isolation and not connected to the DCS / SCADA system, thus avoiding the problem of relying on manual recording and difficulty in data integration.

[0085] As one feasible solution, a blockchain node can be added outside the DCS / SCADA system to encrypt and store daily key data (such as generation and disposal volumes) on the blockchain. The immutability of blockchain ensures data authenticity, replacing the compliance verification function of traditional verification formulas, and is particularly suitable for scenarios with high regulatory requirements.

[0086] In one possible implementation, the controller can be replaced by a PLC (Programmable Logic Controller) and edge computing devices, which can integrate data based on the PLC and edge computing devices and reduce dependence on large DCS systems.

[0087] In this embodiment, an edge computing device (such as an industrial-grade edge computing gateway) can be deployed on-site at the waste liquid monitoring system. The edge computing device is connected to the PLC via Ethernet or other communication methods. After receiving the raw monitoring data from the PLC, the edge computing device processes and analyzes the data in real time (e.g., calculating the amount of waste liquid generated, the change in the amount of waste liquid stored, the rate of change in liquid level, etc.).

[0088] Edge computing devices aggregate processed and analyzed data and upload the aggregated data to cloud servers or enterprise data centers.

[0089] In this embodiment, the edge computing device can be configured to send control commands directly to the PLC based on data analysis results and a preset control strategy, thereby achieving coordinated control of the waste liquid monitoring system.

[0090] In one possible implementation, an IoT module and a cloud platform can be used to replace the DCS controller. Each sensor is configured to connect to the IoT module, and the IoT module is configured to connect to the cloud platform.

[0091] In this embodiment, the cloud platform receives flow meter and level meter data sent by the IoT module. The received data is then stored in a suitable storage medium (such as a time-series database suitable for storing sensor data with time-series characteristics) for easy subsequent querying and analysis.

[0092] The cloud platform integrates with the Internet of Things (IoT) module, uploading flow meter and level gauge data to the cloud platform (such as AWS IoT or Alibaba Cloud) via IoT modules (e.g., LoRa, NB-IoT). The cloud-based data processing service automatically generates an integrated table. This solution supports remote monitoring and multi-terminal access, while leveraging the elastic resources of cloud computing to handle data spikes.

[0093] Configure the cloud platform to extract key information from stored data (such as changes in waste liquid storage volume, first waste liquid generation volume, waste liquid outflow volume, etc.) and automatically generate an integrated table according to a preset table template. It can be configured to use database query statements (such as SQL) or data analysis tools (such as Python's Pandas library) for data extraction and table generation.

[0094] As one feasible solution, miniature data acquisition units (DAUs) can be used to replace sensors and controllers. Specifically, each storage tank can be configured with an independent miniature data acquisition unit (DAU). Each DAU integrates a flow meter, a level gauge, and a local processor, independently calculating data such as the daily production volume of that storage tank, and finally aggregating the data to a central server via wireless communication. This solution reduces system coupling and facilitates modular expansion, but the issue of data synchronization and consistency needs to be addressed.

[0095] Reference Figure 1 and Figure 2 Based on any of the aforementioned schemes, in one possible implementation scheme, the waste liquid monitoring system further includes a fourth sensor 4, which is installed on the transmission pipeline connecting the two storage tanks A and B. The measurement data of the fourth sensor 4 is used to determine the amount of liquid transferred.

[0096] In this embodiment, the waste liquid monitoring system also includes a tank-switching control device, which includes a solenoid valve or a conveying device. Both the solenoid valve and the conveying device are installed on the transmission pipeline connecting the two storage tanks, and both the solenoid valve and the conveying device are communicatively connected to the controller.

[0097] In existing technologies, the volume of wastewater transferred and outsourced for processing relies on manual estimation, which is prone to large errors and lacks traceability. In this embodiment, by designing a third and fourth sensor and integrating them with a controller to form a DCS system, the addition of hardware and automated control eliminates human intervention, improves data accuracy and operational safety, and solves the problems of relying on manual recording of wastewater data heading outside the plant boundary and manual calculation of wastewater transfer data. Simultaneously, automated recording of wastewater transfer data eliminates recording errors caused by the transfer operation, avoiding penalties from environmental authorities.

[0098] In this embodiment, the solenoid valve and the conveying device can be designed with electrical or mechanical linkage. In the control circuit, the auxiliary contact of the solenoid valve is connected in series with the control circuit of the conveying device. When the solenoid valve is closed, the auxiliary contact is opened, cutting off the power supply to the conveying device and stopping it; or, through PLC program logic, while controlling the solenoid valve to close, a command is sent to stop the conveying device.

[0099] In this embodiment, the fourth sensor is dedicated to monitoring the flow rate during the tank transfer operation. Combined with the linkage design (linked with solenoid valves, pumps, etc.), it can avoid safety risks caused by errors in liquid level difference calculation or exceeding operational limits.

[0100] Accordingly, in this embodiment, when the amount of water poured exceeds the second threshold, the controller generates a stop-pour control command and sends it to the solenoid valve, causing the solenoid valve to close. Alternatively, the controller can be configured to generate a stop-pour control command and send it to the conveying device, causing the solenoid valve to close and stopping the conveying device.

[0101] refer to Figure 2 In this embodiment, the fourth sensor 4 can be a flow meter. The fourth sensor 4 records the flow rate when the liquid level of either storage tank A or storage tank B is too high, and the tank is transferred.

[0102] In this embodiment, the fourth sensor 4 also forms a DCS system with the controller, and the controller can use the relevant recorded data of the fourth sensor 4 to integrate the daily tank emptying volume data.

[0103] In this embodiment, an integrated table can be used to independently record and store the amount of tank transfer (as shown in the table below), enabling enterprises to clearly distinguish between normal operations and emergency adjustments, and further improving regulatory transparency.

[0104]

[0105] In this embodiment, the purpose of setting up the fourth sensor 4 is to ensure that the calculation of the tank transfer volume based solely on the tank level difference is susceptible to factors such as liquid level gauge measurement error, medium density fluctuation caused by temperature changes, and actual volume deviation caused by sediment at the bottom of the tank, resulting in inaccurate data; and to ensure that the data of key operation processes are traceable to avoid penalties.

[0106] In this embodiment, the conveying device can be a pump, configured with a fourth sensor 4 for interlocking control with the solenoid valve and pump. When the amount of water transferred exceeds a second threshold, the pump is stopped or the solenoid valve is closed. This interlocking control prevents excessive water transfer from causing overpressure in the transfer pipeline or pump overload.

[0107] In this embodiment, a fourth sensor is used to directly monitor the actual flow rate during the tank transfer operation, avoiding errors caused by medium density fluctuations or tank sediments when calculating based on liquid level differences in traditional methods. Simultaneously, the fourth sensor is interlocked with the solenoid valve and pump for control, automatically stopping the pump when the flow rate exceeds the limit, preventing pipeline overpressure or equipment overload and improving safety.

[0108] Building upon the beneficial effects of the aforementioned solutions, this embodiment adds flow meters to key nodes (waste liquid inlet, waste liquid outlet, and transfer pipeline) of multiple storage tanks, and improves the function of the flow meters to simultaneously record instantaneous flow and 24-hour cumulative flow. All flow meter and level gauge data are connected to the DCS / SCADA system in real time, achieving fully automated data acquisition and integration. This solves the problems of existing technologies that rely on manual recording of instantaneous flow, resulting in isolated and error-prone data.

[0109] This embodiment uses a third sensor to monitor the outsourced transfer volume, replacing manual recording; a fourth sensor is used specifically for monitoring the flow rate during tank transfer operations, combined with interlocking control (linked with solenoid valves and pumps) to avoid safety risks caused by errors in liquid level difference calculations or exceeding operational limits. This addresses the problems of existing technologies where tank transfer and outsourced transfer volumes rely on manual estimation, resulting in large errors and lack of traceability.

[0110] refer to Figure 3 , Figure 3 This is a schematic flowchart of the waste liquid monitoring method provided by the present invention, which includes:

[0111] S101. Obtain the daily change in waste liquid storage volume, the daily first waste liquid generation volume, and the daily waste liquid outflow volume.

[0112] In this solution, the waste liquid monitoring method is applicable to scenarios involving the treatment of liquid hazardous waste (waste liquid). Based on any of the aforementioned solutions, a controller can be configured to execute any of the waste liquid monitoring methods described in this embodiment.

[0113] In this embodiment, the change in waste liquid storage volume represents the difference between the waste liquid storage volume in the storage tank at the first preset time on the current day and the waste liquid storage volume in the storage tank at the first preset time on the previous day. The first preset time can be set according to needs, for example, the first preset time can be 00:00:00.

[0114] For example, in this embodiment, the amount of waste liquid stored can be determined by the measurement value of the level gauge, and then the change in the amount of waste liquid stored can be determined. For example, at the first preset time of each day (such as 00:00:00), the liquid level height value displayed by the level gauge is recorded; the liquid level height value recorded on the current day is subtracted from the liquid level height value at the same time on the previous day to obtain the change in liquid level; then, based on the cross-sectional area of ​​the storage tank and the change in liquid level, the change in the amount of waste liquid stored is calculated.

[0115] Alternatively, the waste liquid storage volume can be determined by the flow meter's measurements, and thus the change in waste liquid storage volume can be determined. For example, starting from the first preset time of each day and ending at the same time the next day, the inlet and outlet flow rate data measured by the flow meter can be recorded. For the inlet flow rate, the inlet flow rate over this period is integrated to obtain the inlet volume; for the outlet flow rate, the same integration is performed to obtain the outlet volume. The change is the difference between the inlet and outlet volumes.

[0116] Alternatively, for scenarios where the waste liquid is a corrosive medium or where contact instruments cannot be installed, a high-definition camera can be installed on the top of the storage tank to monitor changes in liquid level using image recognition technology (such as tracking with reflective markings on the liquid surface). Combined with the parameters of the storage tank, the amount of waste liquid stored can be calculated, thereby determining the amount of change in the amount of waste liquid stored.

[0117] Understandably, when there are multiple storage tanks, the waste liquid storage capacity is the sum of the waste liquid storage capacity of all storage tanks.

[0118] In this embodiment, the first waste liquid generation amount represents the total amount of waste liquid that flows into the storage tank from the second preset time to the first preset time on the same day. The time interval between the second preset time and the first preset time is 24 hours. For example, if the first preset time is 00:00:00, then the second preset time can be 23:59:59.

[0119] For example, in this embodiment, the first waste liquid generation amount can be determined by the measurement value of the flow meter. For instance, from the second preset time to the first preset time of the day, the inlet flow rate data measured by the flow meter is recorded, and the inlet flow rate during this period is integrated to obtain the first waste liquid generation amount.

[0120] Understandably, when there are multiple storage tanks, the first waste liquid generation amount represents the total amount of waste liquid flowing into all storage tanks.

[0121] In this embodiment, the waste liquid outflow volume represents the total amount of waste liquid flowing out of the storage tank from the second preset time to the first preset time on the same day.

[0122] For example, in this embodiment, a storage tank can be configured with multiple waste liquid outlets, and different waste liquid outlets correspond to different waste liquid treatment areas. In this case, the total amount of waste liquid at each waste liquid outlet is obtained separately for different waste liquid treatment areas.

[0123] In this embodiment, the purpose of obtaining the total amount of waste liquid at each waste liquid outlet is as follows: Clearly defining the total amount of waste liquid flowing into different waste liquid treatment areas helps enterprises conduct cost accounting. Enterprises can calculate the resource consumption during hazardous waste treatment, such as energy and reagent costs, based on the treatment volume corresponding to different waste liquid treatment methods. Furthermore, clearly defining the total amount of waste liquid flowing into different waste liquid treatment areas helps enterprises ensure that their hazardous waste treatment practices comply with relevant environmental regulations and standards, avoiding environmental risks and legal liabilities due to improper hazardous waste treatment.

[0124] Understandably, when there are multiple storage tanks, different storage tanks are equipped with the same type of waste liquid outlet. The total amount of waste liquid corresponding to this waste liquid outlet is the total amount of waste liquid flowing out of the same type of waste liquid outlet of all storage tanks.

[0125] In this embodiment, for the total amount of waste liquid at the outlet of a certain type of waste liquid, the corresponding total amount of waste liquid can be determined by the measurement value of the flow meter. From the second preset time of the day to the first preset time, the liquid flow rate data measured by the flow meter is recorded, and the liquid flow rate during this period is integrated to obtain the total amount of waste liquid corresponding to the outlet of the waste liquid.

[0126] For example, in this embodiment, the method of using a flow meter to record the inflow and outflow flow data is not limited. The flow meter itself can be used to accumulate and record the flow data, or the flow data can be accumulated and recorded by combining the controller with software improvements.

[0127] Furthermore, when using software improvements to accumulate and record flow data, a cumulative flow algorithm can be programmed into the flow meter's control chip or controller. The cumulative flow is calculated in real time based on the signal output by the flow meter (such as a pulse signal or analog signal). For flow meters with pulse signal output, the instantaneous flow can be calculated based on the pulse frequency and flow coefficient, and then the cumulative flow is obtained by integrating the instantaneous flow.

[0128] In this embodiment, the flow meter can be an electromagnetic flow meter or an ultrasonic flow meter. These types of flow meters support cumulative flow recording and have higher anti-interference capabilities and long-term stability. For example, an electromagnetic flow meter directly outputs cumulative flow data by measuring the flow velocity of the conductive liquid, meeting data integration requirements without additional modifications, while reducing errors caused by mechanical wear.

[0129] In this embodiment, if a flow meter cannot be added due to cost or installation limitations, flow data can be indirectly obtained through a pipeline pressure sensor combined with a flow velocity calculation model. For example, the instantaneous flow rate can be calculated based on the pipeline diameter, liquid density, and pressure difference, using Bernoulli's equation, and the cumulative flow rate value can be generated through integration.

[0130] S102. Process the changes in the daily waste liquid storage volume and the daily waste liquid outflow volume to obtain the daily second waste liquid generation volume.

[0131] The second waste liquid generation amount is obtained by summing the change in the daily waste liquid storage amount with the daily waste liquid outflow amount.

[0132] Alternatively, a data processing model (such as a time series analysis model or a machine learning model) can be used. The input to this model is the daily change in waste liquid storage and the daily waste liquid outflow; the output is the second waste liquid generation, which can be a predicted value. Understandably, the training and specific algorithms of this data processing model are similar to those in existing technologies and will not be elaborated upon here. This method can identify potential anomalies (such as instrument drift or human tampering) and enhance data reliability.

[0133] S103. When the difference between the first waste liquid generation and the second waste liquid generation is greater than the first threshold, an alarm message is generated.

[0134] The first and second waste liquid generation amounts are calculated using different methods. If the difference between the first and second waste liquid generation amounts is too large, it may be due to errors in the sensor during data acquisition (such as flow meter failure, sensor malfunction, data transmission errors, etc.) or abnormal waste liquid inflow or outflow in the system (such as pipeline leaks, illegal discharges, etc.).

[0135] By setting a first threshold for judgment, these potential problems can be detected in a timely manner, ensuring the accuracy of waste liquid monitoring data and the stable operation of the entire waste liquid treatment system.

[0136] For example, in this embodiment, the alarm information can be configured to indicate the name or location of a specific sensor that may be malfunctioning, or to indicate a leak or illegal discharge of waste liquid. The alarm information can be text, which can be sent to the user's bound terminal device; or, the alarm information can be voice, which can be played through a speaker to alert on-site personnel.

[0137] This embodiment proposes a waste liquid monitoring method. This method acquires multiple sets of data, including changes in waste liquid storage volume, the first waste liquid generation volume, and the waste liquid outflow volume, and calculates the second waste liquid generation volume separately, comparing it with the first waste liquid generation volume. When the difference between the two exceeds a first threshold, an alarm is generated. This avoids the long-term accumulation of measurement data errors caused by abnormal operations (such as pipeline leaks, illegal discharges, incorrect valve opening or closing, etc.) during actual waste liquid treatment, which can lead to severely distorted measurement data that fails to accurately reflect the generation, storage, and outflow of waste liquid. This technology uses real-time logic verification to promptly detect instrument malfunctions or operational anomalies, ensuring the dynamic accuracy of the data.

[0138] In addition, by comparing the waste liquid generation calculated in different ways to determine whether there are data anomalies, it is possible to reflect the causes of anomalies in multiple dimensions. Whether it is data deviation caused by instrument failure or data anomalies caused by abnormal operation, they can be detected and dealt with in the first time. This can ensure that the waste liquid monitoring data always maintains dynamic accuracy and reliability, and provide reliable data support for enterprises' production management, environmental compliance, cost accounting, etc.

[0139] refer to Figure 4 , Figure 4 This is another schematic flowchart of the waste liquid monitoring method provided by the present invention, which includes:

[0140] S201. Obtain the daily change in waste liquid storage volume, the daily first waste liquid generation volume, and the daily waste liquid outflow volume.

[0141] S202. Process the changes in the daily waste liquid storage volume and the daily waste liquid outflow volume to obtain the daily second waste liquid generation volume.

[0142] S203. When the difference between the first waste liquid generation and the second waste liquid generation is greater than the first threshold, an alarm message is generated.

[0143] S201-S203 are the same as S101-S103 in the above embodiments, and will not be described again here.

[0144] S204. Obtain the amount of water poured out and determine whether the amount of water poured out is greater than the second threshold.

[0145] Transferring waste liquid from one storage tank to another is a process of transferring waste liquid between two storage tanks. The transfer volume represents the difference in volume between the two tanks as the waste liquid flows. The transfer volume can be obtained through direct measurement or calculated by estimation.

[0146] In one embodiment, the amount of water to be transferred can be estimated using the power-flow curve and operating time of the variable frequency pump, and this amount is stored as key data in a memory connected to the controller. Specifically, the real-time power of the variable frequency pump during operation is obtained; then, based on the power-flow relationship, the real-time flow rate corresponding to the power is calculated; and finally, the flow rate is integrated over the operating time to obtain the estimated value of the amount of water to be transferred.

[0147] Furthermore, before practical application, the power-flow curve of the variable frequency pump is established through calibration experiments or based on the pump's technical specifications.

[0148] Estimating the amount of water transferred by using the pump's power curve and operating time has some error compared to directly measuring the amount of water transferred, but it can meet basic regulatory requirements.

[0149] S205. If the amount of water transferred exceeds the second threshold, a stop water transfer control command is generated and sent to the water transfer control device.

[0150] For example, in this embodiment, a solenoid valve or a conveying device (such as a pump) can be installed on the transmission pipeline to control the transfer of the solenoid valve or the pump, and a controller is configured to control the start and stop of the solenoid valve or the pump.

[0151] When the amount of water transferred exceeds the second threshold, problems such as pipeline overpressure and pump overload may occur. At this time, the water transfer control equipment closes the solenoid valve and stops the pump by stopping the water transfer control command to prevent pipeline overpressure or pump overload.

[0152] In this embodiment, if the transfer volume suddenly drops, falls below the minimum safety value, or abnormally returns to zero, a stop transfer control command is also generated. At this time, the transfer control equipment closes the solenoid valve and stops the pump through the stop transfer control command to avoid equipment failure or safety hazards caused by abnormal flow, and ensures that the transfer process is carried out safely and stably.

[0153] For example, in this embodiment, a flow meter can be installed on the pipeline for transferring the can, and the measured value of the flow meter represents the amount of can being transferred.

[0154] For example, in this embodiment, a reasonable second threshold can be set after comprehensive evaluation based on the pressure-bearing capacity of the transfer pipeline, the rated operating parameters of the pump, and actual production needs. The second threshold is used to ensure that the pipeline pressure is within a safe range.

[0155] For example, in this embodiment, the normal flow range [Qmin, Qmax] can be set based on the flow fluctuation range during normal tank emptying operations. Here, Qmin can be used as the minimum safe value, and Qmax can be used as the maximum safe value.

[0156] In this embodiment, the amount of water poured into the container is stored as key data to ensure "traceability of key operation process data" and avoid penalties.

[0157] refer to Figure 5 , Figure 5 This is another schematic flowchart of the waste liquid monitoring method provided by the present invention, which includes:

[0158] S301. Obtain the daily change in waste liquid storage volume, the daily first waste liquid generation volume, and the daily waste liquid outflow volume.

[0159] S302. Process the changes in the daily waste liquid storage volume and the daily waste liquid outflow volume to obtain the daily second waste liquid generation volume.

[0160] S303. When the difference between the first waste liquid generation and the second waste liquid generation is greater than the first threshold, an alarm message is generated.

[0161] S301-S303 are the same as S101-S103 in the above embodiments, and will not be described again here.

[0162] S304. Obtain the pressure measurement value of the transmission pipeline and determine whether the pressure measurement value is greater than the third threshold.

[0163] In this embodiment, a pressure sensor and a variable frequency pump can be installed in the transmission pipeline, both of which are connected to the controller. By installing a pressure sensor on the transmission pipeline, pressure measurements can be obtained in real time, enabling continuous monitoring of whether the pressure measurement value is too high (i.e., whether it exceeds a third threshold). The third threshold can be set according to the specific application scenario.

[0164] S305. If the pressure measurement value is greater than the third threshold, a stop tank transfer control command is generated and sent to the tank transfer control device.

[0165] When the pressure measurement value exceeds the third threshold, it indicates that the pressure inside the transfer pipeline is too high, which may lead to risks such as pipeline rupture and leakage. At this time, the controller generates a stop transfer control command and sends it to the transfer control equipment to control the variable frequency pump to automatically reduce speed or stop, so as to avoid dangerous situations.

[0166] refer to Figure 6 , Figure 6 This is another schematic flowchart of the waste liquid monitoring method provided by the present invention, which further includes:

[0167] S401. Obtain the daily change in waste liquid storage volume, the daily first waste liquid generation volume, and the daily waste liquid outflow volume.

[0168] S402. Process the changes in the daily waste liquid storage volume and the daily waste liquid outflow volume to obtain the daily second waste liquid generation volume.

[0169] S403. When the difference between the first waste liquid generation and the second waste liquid generation is greater than the first threshold, an alarm message is generated.

[0170] S401-S403 are the same as S101-S103 in the above embodiments, and will not be described again here.

[0171] S404. Obtain the liquid level change rate of the storage tank; calculate the transfer volume using the liquid level change rate.

[0172] For example, a level gauge can be configured on the storage tank to obtain the recorded liquid level height value. By calculating the difference between the liquid level heights at two adjacent time points and dividing by the time interval, the rate of change of liquid level within that time period can be obtained.

[0173] For example, in this embodiment, if the shape of the storage tank is regular, the cross-sectional area of ​​the storage tank can be determined, and the tank volume can be determined by the following formula:

[0174] V=S×τ×T

[0175] In the formula, V represents the volume of the transfer tank, S represents the cross-sectional area, τ represents the rate of change of liquid level, and T represents the transfer time.

[0176] For example, in this embodiment, if the shape of the storage tank is irregular, the volume of the tank can be determined by using a pre-established three-dimensional model of the storage tank. When using the three-dimensional model, the liquid level height value is input to obtain the corresponding storage volume. The volume of the tank can be obtained by calculating the difference in storage volume corresponding to the liquid level height before and after the tank is poured.

[0177] S405. Determine the decanting mass using the decanting volume, and determine whether the decanting mass is greater than the fourth threshold.

[0178] The transfer mass is the product of the transfer volume and the current waste liquid density, where the waste liquid density can be a preset fixed value. Historical transfer operation data can be collected, including transfer volume, treatment effect, and equipment operating status. By analyzing this data, a reasonable upper limit for the transfer mass can be determined while ensuring the safe and stable operation of the entire system. This upper limit will be used as a reference for the fourth threshold.

[0179] As one possible implementation method, determining the decanting mass using the decanting volume includes:

[0180] S4051, Obtain the coefficient of thermal expansion, current temperature, preset temperature, waste liquid density at the preset temperature, and waste liquid density at the preset temperature.

[0181] A temperature sensor can be installed on the storage tank to determine the current temperature of the waste liquid.

[0182] The preset temperature can be determined according to process requirements or through calibration tests and simulation tests.

[0183] The coefficient of thermal expansion for the composition of waste liquid can usually be obtained from relevant literature, material handbooks, or through experimental measurement.

[0184] S4052. Calculate the difference between the current temperature and the preset temperature to obtain the temperature difference.

[0185] S4053. Based on the temperature difference and the coefficient of thermal expansion, the density of the waste liquid at the preset temperature is corrected to obtain the density of the waste liquid at the current temperature.

[0186] After determining the coefficient of thermal expansion, the temperature difference (i.e., the difference between the current temperature and the preset temperature), and the waste liquid density corresponding to the preset temperature, the corrected waste liquid density (i.e., the waste liquid density at the preset temperature) can be calculated using the principle of thermal expansion.

[0187] Furthermore, as one possible implementation method, the density of the waste liquid at the current temperature can be calculated using the following formula:

[0188] ρ a =ρ0×(1-α(T-T0)) (1)

[0189] In the formula, ρ0 represents the density of the waste liquid at the preset temperature, T represents the current temperature, T0 represents the preset temperature, and α represents the coefficient of thermal expansion.

[0190] S4054. Calculate the product of the waste liquid density at the current temperature and the volume of the empty tank to obtain the empty tank mass.

[0191] The volume V of the transfer tank is calculated using the following formula:

[0192] V=∫G s |h l| (2)

[0193] In the formula, G s h represents the cross-sectional area of ​​the liquid storage tank. l This indicates the rate of change of liquid level.

[0194] The mass m of the can being poured is calculated using the following formula:

[0195] m=V×ρ a (3)

[0196] This embodiment dynamically corrects the density of the waste liquid based on temperature, making the calculation of the transfer mass more consistent with the actual situation. This provides reliable data support for the precise control of the transfer operation, the planning of subsequent waste liquid treatment processes, and cost accounting, avoiding the loss of control over the transfer volume due to density errors, ensuring the safety and stability of the transfer process, and improving the operating efficiency of the waste liquid treatment system.

[0197] S406. If the water transfer quality exceeds the fourth threshold, a stop water transfer control command is generated and sent to the water transfer control device.

[0198] In this embodiment, the volume and mass of the liquid being transferred are calculated by real-time monitoring of the liquid level change rate of the storage tank and compared with a threshold value. This effectively prevents safety accidents such as overflow or rupture of the storage tank due to excessive transfer volume, ensuring the safety of personnel and equipment. Simultaneously, it avoids situations such as pipeline overpressure and pump overload, extending the service life of the equipment and reducing maintenance costs and production downtime caused by equipment failure.

[0199] refer to Figure 7 , Figure 7 This is a schematic flowchart of the waste liquid monitoring method provided by the present invention, which includes:

[0200] S501. Obtain the daily change in waste liquid storage volume, the daily first waste liquid generation volume, and the daily waste liquid outflow volume.

[0201] The following method can be used to obtain the change in the daily waste liquid storage volume:

[0202] S5011. Obtain the liquid level measurement and temperature measurement of the storage tank for the day; determine the waste liquid density for the day using the density-temperature curve based on the temperature measurement for the day; determine the first waste liquid storage volume based on the waste liquid density for the day and the liquid level measurement of the storage tank for the day.

[0203] The tank volume can be dynamically calibrated by combining level gauge data with temperature sensor data to compensate for level measurement errors caused by changes in medium density or sediment.

[0204] S5012. Obtain the liquid level and temperature measurements of the storage tank from the previous day; determine the waste liquid density of the previous day using a density-temperature curve based on the temperature measurement of the previous day; determine the second waste liquid storage volume based on the waste liquid density of the previous day and the liquid level measurement of the storage tank from the previous day.

[0205] The liquid level and temperature measurements of the storage tank for the current day and the previous day were obtained respectively. The liquid level measurement was used to determine the height of the waste liquid in the storage tank, while the temperature measurement was used to subsequently determine the density of the waste liquid.

[0206] The density of the waste liquid is determined using a density-temperature curve based on temperature measurements taken on the current day and the previous day. This density-temperature curve is pre-calibrated, allowing for accurate determination of the waste liquid density at a known temperature.

[0207] S5013. Calculate the difference between the first waste liquid storage volume and the second waste liquid storage volume to obtain the change in waste liquid storage volume on that day.

[0208] This embodiment introduces temperature measurement and the corresponding density-temperature curve. The waste liquid density is determined based on the real-time temperature measurement, and then the waste liquid storage volume is calculated by combining this with the liquid level measurement. This compensates for liquid level measurement errors caused by changes in medium density or sediment. Traditional liquid level gauges have limited accuracy under complex operating conditions. This embodiment improves the accuracy of tank storage volume calculation through dynamic calibration, making it particularly suitable for scenarios with fluctuating medium properties.

[0209] In this embodiment, the daily waste liquid outflow includes a first waste liquid outflow and a second waste liquid outflow. The first waste liquid outflow represents the total amount of waste liquid flowing from the storage tank into the first waste liquid treatment device from the second preset time to the first preset time on the same day. The second waste liquid outflow represents the total amount of waste liquid flowing from the storage tank into the second waste liquid treatment device from the second preset time to the first preset time on the same day.

[0210] Furthermore, the first wastewater treatment device is designated as a self-utilization / disposal device, and the second wastewater treatment device is designated as an outsourced transfer device. The self-utilization / disposal device refers to the enterprise or unit constructing its own wastewater treatment facilities to treat its own generated wastewater; the outsourced transfer device is used to entrust the wastewater to a qualified third-party organization for treatment.

[0211] In this embodiment, by monitoring the two outflow rates separately, enterprises can clearly understand the scale of waste liquid treated by themselves and outsourced treatment, providing accurate data support for cost accounting, resource allocation, and compliance management.

[0212] In this embodiment, a flow meter can be installed on the pipeline connecting the storage tank and the first waste liquid treatment device to measure the flow rate at the waste liquid outlet of the first waste liquid treatment device; a flow meter can also be installed on the pipeline connecting the storage tank and the second waste liquid treatment device to monitor the flow rate at the waste liquid outlet of the second waste liquid treatment device.

[0213] In this embodiment, the first waste liquid outflow and the second waste liquid outflow are calculated based on the flow data recorded by the two flow meters during the period from the second preset time to the first preset time.

[0214] S502. Calculate the difference between the first waste liquid storage volume of the day and the second waste liquid storage volume of the previous day to obtain the current waste liquid storage volume.

[0215] S503. The current waste liquid storage volume, the daily first waste liquid outflow volume, and the daily second waste liquid outflow volume are weighted and summed to obtain the second waste liquid generation volume.

[0216] In this embodiment, the amount of the second waste liquid generated on the day is calculated by combining the changes in the storage capacity of the storage tank and the flow data of different outflow paths (the outflow volume of the first waste liquid and the outflow volume of the second waste liquid) through a weighted summation method.

[0217] In this embodiment, different weights are assigned to different data points for the first and second waste liquid outflow volumes, highlighting the impact of key data on the final result. This can provide more reliable data references for subsequent waste liquid treatment decisions, resource allocation, and compliance management.

[0218] For example, in this embodiment, weights can be assigned to the current waste liquid storage volume, the first waste liquid outflow volume of the day, and the second waste liquid outflow volume of the day, based on actual production experience, the importance of different waste liquid outflow paths, and the degree of influence on the final result.

[0219] Furthermore, as one possible implementation, the change in the daily waste liquid storage volume and the daily waste liquid outflow volume are processed to obtain the daily second waste liquid generation volume, which is determined using the following formula:

[0220] F2 = C1 - C2 + S1 + S2

[0221] In the formula, F2 represents the amount of the second waste liquid generated, C1 represents the amount of the first waste liquid stored on the current day, C2 represents the amount of the second waste liquid stored on the previous day, S1 represents the amount of the first waste liquid outflowed on the current day, and S2 represents the amount of the second waste liquid outflowed on the current day.

[0222] In this embodiment, a flow meter is installed at the waste liquid inlet of the storage tank to calculate the cumulative flow data of the flow meter from 00:00:00 to 23:59:59 every day, and to calculate the first waste liquid generation.

[0223] A level gauge is installed on the storage tank. The first waste liquid storage volume for the day is obtained and stored using the level gauge data up to 23:59:59. The waste liquid storage volume up to 23:59:59 of the previous day is retrieved from the memory and used as the second waste liquid storage volume.

[0224] The outflow rate of the first waste liquid is obtained by using the flow data of the flow meter used in conjunction with the first waste liquid treatment device from 00:00:00 to 23:59:59 every day.

[0225] The outflow rate of the second waste liquid is obtained by using the flow data of the flow meter used in conjunction with the second waste liquid treatment device from 00:00:00 to 23:59:59 every day.

[0226] S504. Determine whether the amount of the first waste liquid generated is the same as the amount of the second waste liquid generated.

[0227] S505. If the amount of the first waste liquid generated is different from the amount of the second waste liquid generated, an alarm message will be generated.

[0228] When the amount of the first waste liquid generated differs from the amount of the second waste liquid generated, the controller generates an alarm message to prompt manual verification. This helps to quickly locate the problem, improve the efficiency and safety of waste liquid monitoring and management, and reduce environmental risks and management loopholes caused by data errors or abnormal situations.

[0229] By comparing and verifying the first and second waste liquid generation volumes, the reliability and verifiability of the data are increased. On the one hand, the first waste liquid generation volume, directly calculated based on the flow meter, can quickly reflect the flow rate of waste liquid generation; on the other hand, the second waste liquid generation volume, calculated based on material balance, provides an overall view of waste liquid storage and flow direction changes. The two complement and verify each other.

[0230] Based on any of the aforementioned schemes, in one possible implementation scheme, the monitoring method further includes: storing the daily first waste liquid generation volume, the daily waste liquid outflow volume, and the daily waste liquid storage volume in a database.

[0231] Based on the storage tank number and / or waste liquid type, the daily first waste liquid generation, daily waste liquid outflow, and daily waste liquid storage volume are categorized and summarized into a statistical table, which is then displayed. Upon receiving an export command, the statistical table is exported.

[0232] In this embodiment, the database can be a relational database (MySQL, Oracle, SQL Server, etc.) or a non-relational database (MongoDB, etc.).

[0233] When configuring the database, create corresponding tables to store the daily first waste liquid generation, waste liquid outflow, and waste liquid storage volume. Ensure that the tables are linked through appropriate fields (such as date, storage tank number, waste liquid type, etc.) to facilitate data querying and analysis.

[0234] In this embodiment, the database query statement is configured to enable the database to support operations such as grouping, summing, and averaging of data according to actual needs (by the storage tank number, waste liquid type, etc.).

[0235] In this embodiment, the query results can be exported to common file formats such as CSV and Excel using the database's built-in export tool or by writing program code.

[0236] In this embodiment, the use of a database to achieve systematic integration of monitoring data can improve management efficiency and meet the need for rapid generation of regulatory reports.

[0237] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for monitoring waste liquid, characterized in that, include: Obtain the daily change in waste liquid storage volume, the daily first waste liquid generation volume, and the daily waste liquid outflow volume; The change in the daily waste liquid storage volume and the daily waste liquid outflow volume are processed to obtain the daily second waste liquid generation volume; An alarm message is generated when the difference between the first waste liquid generation and the second waste liquid generation exceeds a first threshold. Wherein, the change in waste liquid storage volume represents the difference between the waste liquid storage volume in the storage tank at the first preset time on the current day and the waste liquid storage volume in the storage tank at the first preset time on the previous day; The first waste liquid generation amount represents the total amount of waste liquid that flows into the storage tank from the second preset time to the first preset time on the same day; The waste liquid outflow represents the total amount of waste liquid that flows out of the storage tank from the second preset time to the first preset time on the same day.

2. The waste liquid monitoring method as described in claim 1, characterized in that, The method further includes: The amount of waste liquid transferred between the two storage tanks is obtained, and it is determined whether the amount of waste liquid transferred between the two storage tanks is greater than a second threshold. If so, a stop waste liquid transfer control command is generated and sent to the waste liquid transfer control device. The amount of waste liquid transferred between the two storage tanks represents the difference in the amount of waste liquid transferred between the two storage tanks. Alternatively, the method may further include: acquiring a pressure measurement value of the transmission pipeline and determining whether the pressure measurement value is greater than a third threshold; if so, generating a stop transfer control command and sending it to the transfer control device.

3. The waste liquid monitoring method as described in claim 1, characterized in that, The method further includes: obtaining the liquid level change rate of the storage tank; calculating the transfer volume using the liquid level change rate; determining the transfer mass using the transfer volume, and determining whether the transfer mass is greater than a fourth threshold; if so, generating a stop transfer control command and sending it to the transfer control device.

4. The waste liquid monitoring method as described in claim 3, characterized in that, The method of determining the canning mass using the canning volume includes: Obtain the coefficient of thermal expansion, current temperature, preset temperature, waste liquid density at the preset temperature, and waste liquid density at the preset temperature; Calculate the difference between the current temperature and the preset temperature to obtain the temperature difference; The waste liquid density at the preset temperature is corrected based on the temperature difference and the coefficient of thermal expansion to obtain the waste liquid density at the current temperature. The mass of the waste liquid is obtained by multiplying the density of the waste liquid at the current temperature by the volume of the transfer tank.

5. The waste liquid monitoring method as described in claim 1, characterized in that, The daily waste liquid outflow includes a first waste liquid outflow and a second waste liquid outflow; the first waste liquid outflow represents the total amount of waste liquid flowing from the storage tank into the first waste liquid treatment device from the second preset time to the first preset time on the same day; the second waste liquid outflow represents the total amount of waste liquid flowing from the storage tank into the second waste liquid treatment device from the second preset time to the first preset time on the same day. The change in the daily waste liquid storage volume and the daily waste liquid outflow volume are processed to obtain the daily second waste liquid generation volume, including: Calculate the difference between the first waste liquid storage volume of the current day and the second waste liquid storage volume of the previous day to obtain the current waste liquid storage volume; The second waste liquid generation amount is obtained by weighted summing of the current waste liquid storage amount, the first waste liquid outflow amount on the same day, and the second waste liquid outflow amount on the same day.

6. The waste liquid monitoring method as described in claim 1, characterized in that, The changes in waste liquid storage volume on that day include: Obtain the liquid level and temperature measurements of the storage tank for the day; determine the waste liquid density for the day using a density-temperature curve based on the temperature measurement for the day; determine the first waste liquid storage volume based on the waste liquid density and the liquid level measurement of the storage tank for the day. Obtain the liquid level and temperature measurements of the storage tank from the previous day; determine the waste liquid density of the previous day using the density-temperature curve based on the temperature measurement of the previous day; determine the second waste liquid storage volume based on the waste liquid density of the previous day and the liquid level measurement of the storage tank from the previous day. Calculate the difference between the first waste liquid storage volume and the second waste liquid storage volume to obtain the change in the waste liquid storage volume on that day.

7. The waste liquid monitoring method according to any one of claims 1 to 6, characterized in that, The method further includes: The daily amount of first waste liquid generated, the daily amount of waste liquid discharged, and the daily amount of waste liquid stored are stored in the database. According to the storage tank number and / or the type of waste liquid, the daily first waste liquid generation, the daily waste liquid outflow, and the daily waste liquid storage are classified and summarized to form a statistical table and displayed. Upon receiving the export instruction, the statistical table is exported.

8. A waste liquid monitoring system, characterized in that, The waste liquid monitoring system includes a controller for performing the waste liquid monitoring method according to any one of claims 1 to 7.

9. The waste liquid monitoring system as described in claim 8, characterized in that, The waste liquid monitoring system also includes at least two storage tanks, several first sensors, several second sensors, and several third sensors; all three sensors are communicatively connected to the controller. The first sensor is disposed on at least one of the tank bodies of the liquid storage tank, the second sensor is disposed on at least one waste liquid inlet end of the liquid storage tank, and the third sensor is disposed on at least one waste liquid outlet end of the liquid storage tank; The measurement data from the first sensor is used to determine the change in the amount of waste liquid stored, the measurement data from the second sensor is used to determine the amount of first waste liquid generated, and the measurement data from the third sensor is used to determine the amount of waste liquid discharged.

10. The waste liquid monitoring system as described in claim 9, characterized in that, The waste liquid monitoring system also includes a fourth sensor, which is installed on the transmission pipeline connecting the two storage tanks. The measurement data of the fourth sensor is used to determine the amount of liquid transferred. And / or, the waste liquid monitoring system further includes a tank-switching control device, which includes a solenoid valve or a conveying device. The solenoid valve and the conveying device are both installed on the transmission pipeline connecting the two storage tanks, and the solenoid valve and the conveying device are both communicatively connected to the controller. When the amount of water poured exceeds the second threshold, the controller generates a stop water pouring control command and sends it to the solenoid valve to close the solenoid valve, and / or the controller generates a stop water pouring control command and sends it to the conveying device to close the solenoid valve and stop the conveying device.

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