Sulfide monitoring system for drain outlet

Abstract

The invention belongs to the technical field of sulfide monitoring, and particularly discloses a sulfide monitoring system for a sewage draining exit, which is characterized in that the monitoring frequency of sulfide monitoring equipment is adjusted in different time periods by analyzing the regularity of sewage discharge in time periods and combining the corresponding relationship between the sewage discharge amount and the sewage flow rate, so that the sulfide monitoring accuracy is improved. The monitoring frequency can be improved in the time period when the flow speed of sewage is high, so that the change of sulfide concentration can be more accurately captured, the situation of data loss or underestimation caused by too high flow speed is avoided, the accuracy and reliability of monitoring data can be improved from the perspective of untimely reaction of the flow speed of the sewage to a monitoring result, and the monitoring accuracy is improved. Meanwhile, the sewage quality is monitored while sulfide monitoring is carried out at the drain outlet, the influence relation between the sewage quality and the sulfide concentration is analyzed in combination with the monitoring result, then the sulfide monitoring result is corrected according to the influence relation, and the accuracy of monitoring data can be improved from the angle of the influence of the sewage quality on the monitoring result.

Description

Technical Field

[0001] The invention belongs to the technical field of sulfide monitoring, in particular to sewage sulfide monitoring technology, and specifically discloses a sulfide monitoring system for a sewage outlet. Background Art

[0002] Sulfide is one of the common pollutants in emission sources, and its main sources include industrial wastewater, sewage treatment plants, chemical plants, etc. Large amounts of sulfide emissions may cause water and soil pollution and have serious impacts on the ecosystem. By monitoring sulfide emissions from sewage outlets, potential pollution sources can be discovered and identified in a timely manner, which helps prevent and reduce environmental pollution.

[0003] In order to provide more accurate and real-time sulfide monitoring data, the existing sulfide monitoring equipment is usually placed at the sewage outlet when conducting sulfide monitoring at the sewage outlet, in direct contact with the sewage, to reduce the impact of external interference on the monitoring results. However, this monitoring method ignores the impact of sewage flow rate and sewage water quality on the monitoring results. Specifically, when the sewage discharge volume is large, a faster sewage flow rate will be generated. When the sewage flow rate is fast, it is easy to accelerate the diffusion of sulfide around the monitoring equipment, resulting in the instantaneous change of sulfide concentration not being captured by the monitoring equipment, thereby affecting the authenticity of the monitoring results. In addition, there may be a variety of other chemical substances in the sewage, such as chlorides, nitrites, etc., which may interfere with sulfides. At the same time, the pH and turbidity of the sewage may interfere with the performance of the monitoring equipment. These will affect the accurate measurement of sulfide concentration by the monitoring equipment, resulting in distortion of sulfide monitoring data, making it difficult to provide reliable data support for the assessment of environmental pollution, resulting in incomplete or inaccurate environmental pollution assessment. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a sulfide monitoring system for sewage outlets, which analyzes the influence of sewage flow rate and sewage water quality on sulfide concentration and corrects the monitored sulfide concentration, thereby effectively making up for the shortcomings of existing sulfide monitoring methods at sewage outlets.

[0005] The object of the present invention can be achieved by the following technical scheme: A sulfide monitoring system for sewage outlets, comprising: a sewage discharge collection module, which is used to allow a user to select a historical interval, and divide each discharge day into multiple time periods according to a set time interval within the interval, thereby obtaining the sewage discharge amount in each time period on each discharge day;

[0006] The sewage discharge law analysis module is used to analyze the sewage discharge volume in different time periods on each discharge day, identify regular time periods and irregular time periods, and calculate the effective sewage discharge volume in these two time periods respectively;

[0007] A sewage flow rate acquisition module is used to determine the sewage flow rates of the regular time period and the irregular time period according to the effective sewage discharge volume in the two time periods from the corresponding relationship between the discharge volume and the sewage flow rate;

[0008] A monitoring frequency adjustment module, used to dynamically adjust the monitoring frequency of the sulfide monitoring equipment in regular and irregular time periods by comparing the sewage flow rate in these two time periods with the non-interference flow rate of the sulfide monitoring equipment;

[0009] The sewage discharge monitoring module is used to monitor the sulfide concentration and water quality indicators by using the sulfide monitoring equipment and water quality monitoring equipment arranged at the sewage discharge outlet after adjusting the monitoring frequency, and to sample the sewage at the sewage discharge outlet to obtain the sulfide concentration data;

[0010] The impact correlation analysis module is used to compare the sulfide concentration collected by the sulfide monitoring equipment with the sulfide concentration obtained by sampling during the set trial monitoring period, and compare the collected water quality indicators with the appropriate water quality indicators of the normal operation of the sulfide monitoring equipment to analyze the correlation between sewage water quality and sulfide concentration;

[0011] The monitoring correction module is used to correct the sulfide concentration collected by the sulfide monitoring equipment in the formal monitoring after the set trial monitoring period based on the correlation between the sewage water quality and the sulfide concentration.

[0012] The response monitoring and early warning module is used to set the analysis cycle in formal monitoring, and then record the response time of the sulfide monitoring equipment each time it monitors the sulfide concentration within the analysis cycle, and compare it with the ideal response time of the sulfide monitoring equipment to calculate the response timeliness. At the same time, a response change curve is formed based on the response time of each sulfide concentration monitoring, and then the response change rate is extracted from the response change curve.

[0013] The response timeliness of the sulfide monitoring equipment is combined with the response change rate to calculate the response anomaly index.

[0014] The response abnormality index of the sulfide monitoring equipment in each analysis cycle is compared with the allowable response abnormality index set by the system. If the response abnormality index of the sulfide monitoring equipment in a certain analysis cycle is greater than the allowable response abnormality index, an early warning is initiated on the end date of the analysis cycle.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention analyzes the regularity of sewage discharge in time periods, and thereby adjusts the monitoring frequency of sulfide monitoring equipment in different time periods in combination with the corresponding relationship between sewage discharge volume and sewage flow rate, thereby realizing dynamic targeted adjustment of sulfide monitoring frequency. The monitoring frequency can be increased during periods of faster sewage flow rates to more accurately capture fluctuations and changes in sulfide concentrations, thereby avoiding data loss or underestimation due to excessively fast flow rates, and improving the accuracy and reliability of monitoring data from the perspective of the untimely response of sewage flow rates to monitoring results.

[0016] 2. The present invention monitors sewage water quality while monitoring sulfide at the sewage outlet, and analyzes the influence relationship between sewage water quality and sulfide concentration in combination with the monitoring results, and then corrects the sulfide monitoring results accordingly. It can improve the accuracy of monitoring data from the perspective of the impact of sewage water quality on monitoring results, which is beneficial to provide reliable data support for environmental pollution assessment.

[0017] 3. The present invention performs response monitoring while monitoring the sulfide concentration using the sulfide monitoring equipment, thereby identifying whether there is a response abnormality. When a response abnormality is identified, an early warning is issued, and the operation abnormality of the sulfide monitoring equipment can be discovered in time. Discovering these problems in time can prevent interruptions or errors in data collection and ensure the reliability and continuity of the sulfide concentration data. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the connection of each module of the system of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1As shown, the present invention proposes a sulfide monitoring system for sewage outlets, including a sewage discharge collection module, a sewage discharge law analysis module, a sewage flow rate acquisition module, a monitoring frequency adjustment module, a sewage discharge monitoring module, an impact correlation analysis module, a monitoring correction module and a response monitoring and early warning module, wherein the sewage discharge collection module is connected to the sewage discharge law analysis module, the sewage discharge law analysis module is connected to the sewage flow rate acquisition module, the sewage flow rate acquisition module is connected to the monitoring frequency adjustment module, the monitoring frequency adjustment module is connected to the sewage discharge monitoring module, the sewage discharge monitoring module is connected to the impact correlation analysis module, the impact correlation analysis module is connected to the monitoring correction module, and the monitoring frequency adjustment module is connected to the response monitoring and early warning module.

[0022] The sewage discharge collection module is used to allow the user to select a historical interval, and divide each discharge day into multiple time periods within the interval at set time intervals, thereby obtaining the sewage discharge volume of each discharge day in each time period.

[0023] It should be added that the historical interval is selected in order to extract the pollution discharge records of each discharge day within the historical interval. The selection of the historical interval is limited to the current time to avoid the extracted pollution discharge records being too old and unable to truly reflect the pollution discharge status at the current stage. In addition, the historical interval can be three months, half a year or one year to avoid the historical interval being too short, resulting in too few extracted pollution discharge records, affecting the representativeness of the analysis of the period law of sewage discharge.

[0024] It is further necessary to add that, since the extraction of sewage discharge volume in the present invention is mainly for association with sewage flow rate, and the dominant factor affecting sewage flow rate is sewage discharge volume, this is because sewage discharge volume refers to the total amount of sewage discharged to the sewage outlet per unit time. Obviously, the greater the discharge volume, the more total amount of sewage flowing into the sewage outlet per unit time, which directly affects the flow rate of sewage in the pipeline or river, because the flow rate can be expressed as the volume of sewage passing through the sewage outlet per unit time divided by the cross-sectional area of ​​the sewage outlet, and the cross-sectional area of ​​the sewage outlet is relatively stable in the short term, while the change of discharge volume is the main dynamic factor. Therefore, when the discharge volume changes, the change of flow rate is often the most direct and significant, but the influence of external environmental factors on sewage flow rate is not excluded, especially rainfall will affect the flow rate of sewage, but these are usually short-term changes, under steady-state conditions, discharge volume is still the dominant factor determining sewage flow rate, in order to avoid the influence of external environmental factors on sewage flow rate, further screening out discharge days without rainfall according to the weather conditions of each discharge day in the selected historical period for analysis will be more reasonable and in line with actual use needs.

[0025] In the optimized implementation of the above scheme, since the duration of each emission day is fixed at 24 hours, the time periods divided for each emission day are consistent. In the specific division, a moment can be selected as the starting division moment, and the moment 24 hours after the starting moment is taken as the ending moment. The starting moment and the ending moment constitute a time interval. For example, the starting moment is 6:00, and the set time interval is 2 hours. The divided time periods can be 6:00-8:00, 8:00-10:00, 10:00-12:00, 12:00-14:00, 14:00-16:00, etc.

[0026] It should be understood that the shorter the set time interval is, the more time periods are obtained and the more detailed the divisions are, which can improve the time resolution. This means that changes in sewage discharge can be captured more accurately because more specific discharge data within more time segments can be obtained, thereby supporting a more detailed analysis of the regularity of sewage discharge over time periods.

[0027] In the further optimization implementation of the above scheme, after the time period division of a single discharge day is completed, the sewage discharge record of each discharge day is extracted, wherein the sewage discharge record contains the sewage discharge time period and sewage discharge volume, thereby extracting the sewage discharge volume belonging to the corresponding time period from the sewage discharge record.

[0028] The sewage discharge regularity analysis module is used to perform period regularity analysis on the sewage discharge volume in different time periods on each discharge day, identify regular time periods and irregular time periods, and calculate the effective sewage discharge volume in these two time periods respectively.

[0029] Applied to the above embodiment, the time period regularity analysis of the sewage discharge volume in different time periods on each discharge day is carried out as follows: with the date of the discharge day as the horizontal axis and the sewage discharge volume as the vertical axis, a number of points are marked in the constructed coordinate system for the sewage discharge volume on each discharge day in the same time period to form a sewage discharge volume change curve corresponding to each time period, and the change rate of the change curve is obtained, wherein the change rate can be obtained by accumulating and averaging the slopes of each point on the change curve.

[0030] Taking the reciprocal of the natural constant as the base and the absolute value of the change rate of the sewage discharge change curve corresponding to each time period as the exponent, the sewage discharge stability corresponding to each time period is calculated. The smaller the absolute value of the change rate, the greater the sewage discharge stability.

[0031] The sewage discharge stability corresponding to each time period is compared with the initial threshold of the system. For example, the initial threshold of the sewage discharge stability can be 0.8. The purpose of setting it is to assist in the division of regular sewage discharge time periods. If the sewage discharge stability corresponding to a certain time period is greater than or equal to the initial threshold of the system, it is recognized that the sewage discharge volume of this time period has regularity; otherwise, it is recognized that the sewage discharge volume of this time period has no regularity.

[0032] It should be understood that chemical plants usually arrange production and sewage discharge according to working hours, so their emissions may have obvious periodicity during the working hours. Sewage treatment plants usually adjust the operation strategy of the treatment system according to the sewage load in different time periods. This makes the sewage discharge from the sewage outlet may show a certain periodicity in the time period according to the management and regulation of the sewage treatment plant. Therefore, whether it is the sewage discharged from the chemical plant to the sewage outlet or the sewage discharged from the sewage treatment plant to the sewage outlet, it may cause periodic emissions. This periodicity causes the regularity of sewage discharge in the time period.

[0033] Further applied to the above embodiment, the effective sewage discharge volume in the two time periods is calculated as follows: the sewage discharge volume on each discharge day in the regular time period is averaged to obtain the effective sewage discharge volume corresponding to the regular time period.

[0034] Extract the change rate sign of the sewage discharge change curve corresponding to the irregular period. If the change rate sign of the sewage discharge change curve corresponding to a certain irregular period is negative, it means that the sewage discharge in the irregular period shows a downward trend. Then take the maximum sewage discharge in the sewage discharge on each discharge day of the irregular period as the effective sewage discharge corresponding to the irregular period. Otherwise, it means that the sewage discharge in the irregular period shows an upward trend. Then take the maximum sewage discharge Q of the sewage discharge on each discharge day of the irregular period. max Combined with the change rate λ of the sewage discharge change curve corresponding to the irregular period, the expression Q 有效 =Q max *(1+λ) to obtain the effective sewage discharge Q corresponding to the irregular period 有效 .

[0035] It should be explained that taking the average sewage discharge volume corresponding to the historical discharge day in the regular period as the effective discharge volume is to utilize the typical pattern in the historical data, which can more accurately reflect the discharge situation in the period. When the sewage discharge volume shows a downward trend in the irregular period, the maximum sewage discharge volume in the historical discharge day is selected as the effective discharge volume to ensure that the situation under the most unfavorable conditions is taken into account; when the sewage discharge volume shows an upward trend, the effective discharge volume is determined by combining the historical maximum discharge volume and the upward trend, which can also more comprehensively consider possible future situations.

[0036] The sewage flow rate acquisition module is used to determine the sewage flow rates of the regular time period and the irregular time period according to the effective sewage discharge volume in the two time periods from the corresponding relationship between the discharge volume and the sewage flow rate.

[0037] In the specific implementation of the above scheme, the correspondence between the sewage discharge volume and the sewage flow rate can be established by installing a flow meter at an appropriate position of the sewage outlet, which can measure the sewage discharge volume in real time. The flow meter can be an electromagnetic flow meter, an ultrasonic flow meter or other flow measurement equipment suitable for sewage applications. A flow rate sensor or other flow rate measurement equipment is used to measure the sewage flow rate under different discharge conditions. These measurements can be carried out under actual operating conditions to obtain real discharge volume and flow rate data, thereby constructing a correspondence between sewage discharge volume and sewage flow rate. Of course, the measurement of sewage discharge volume and sewage flow rate also needs to be carried out when it is not raining to avoid the influence of the external environment on the construction of the correspondence.

[0038] The monitoring frequency adjustment module is used to dynamically adjust the monitoring frequency of the sulfide monitoring equipment in regular time periods and irregular time periods by comparing the sewage flow rate in these two time periods with the non-interference flow rate of the sulfide monitoring equipment.

[0039] It should be noted that the non-interference flow rate corresponding to the sulfide monitoring equipment refers to the maximum sewage flow rate that has no impact on sulfide monitoring, that is, the sulfide monitoring equipment can normally capture the sulfide concentration at this sewage flow rate. Due to the differences in the sensitivity of different sulfide monitoring equipment, the non-interference flow rates corresponding to different sulfide monitoring equipment are different, which can be obtained from the technical manual based on the technical specifications of the sulfide monitoring equipment.

[0040] Preferably, the monitoring frequency is dynamically adjusted as follows: the sewage flow rate in regular time periods and irregular time periods is compared with the non-interference flow rate corresponding to the sulfide monitoring equipment. If the sewage flow rate in a certain time period does not reach the non-interference flow rate, the default monitoring frequency of the sulfide monitoring equipment is used for monitoring in that time period, wherein the monitoring frequency refers to the number of times the monitoring equipment obtains data or measures per unit time. The default monitoring frequency refers to the fixed monitoring rate of the monitoring equipment under normal operation, that is, the monitoring frequency set at the time of manufacturing and performed by the monitoring equipment without special settings. The specific information can be obtained from the technical user manual. Under normal circumstances, the designer of the monitoring equipment will try to make the default monitoring frequency as low as possible while meeting the application requirements. If the sewage flow rate in a certain time period reaches the non-interference flow rate, the sewage flow rate in that time period is compared with the non-interference flow rate, and the required monitoring frequency for that time period is calculated in combination with the default monitoring frequency. The specific calculation formula is: In the formula, V represents the sewage flow rate, V0 represents the non-interference flow rate, f0 represents the default monitoring frequency, and f represents the demand monitoring frequency. From this formula, it can be seen that the higher the sewage flow rate is than the non-interference flow rate, the greater the demand monitoring frequency.

[0041] Obtain the monitoring frequency range that the sulfide monitoring equipment can achieve, and extract the upper limit monitoring frequency from it, and then compare the demand monitoring frequency of the period with the upper limit monitoring frequency. If the demand monitoring frequency of the period is less than the upper limit monitoring frequency, monitor at the demand monitoring frequency during the period; if the demand monitoring frequency of the period is higher than or equal to the upper limit monitoring frequency, monitor at the upper limit monitoring frequency during the period.

[0042] It should be noted that the monitoring frequency range that the monitoring device can achieve depends on the type of device. When the type of monitoring device is low frequency, the monitoring frequency range that can be achieved is usually between several times and dozens of times per second. When the type is medium frequency, the monitoring frequency range that can be achieved is usually between dozens of times and hundreds of times per second. The specific information can be obtained from the instructions for use of the monitoring device.

[0043] The present invention performs sulfide monitoring by maintaining a default monitoring frequency during a period when the sewage flow rate reaches a non-interference flow rate, and increases the monitoring frequency during a period when the sewage flow rate reaches a non-interference flow rate, thereby realizing dynamic monitoring of sulfides based on the sewage flow rate. This can reduce energy consumption while meeting monitoring needs, extend the service life of monitoring equipment, reduce maintenance and replacement costs, and thus reduce operating costs.

[0044] The sewage discharge monitoring module is used to monitor sulfide concentration and water quality indicators using sulfide monitoring equipment and water quality monitoring equipment installed at the sewage outlet after adjusting the monitoring frequency, wherein the water quality indicators include but are not limited to pH, turbidity, chloride concentration, and sewage sampling is performed at the sewage outlet to obtain sulfide concentration data.

[0045] It should be added that the sulfide concentration obtained by sampling sewage at the sewage outlet is the sulfide concentration obtained by extracting sewage samples from the sewage outlet and separating and analyzing them in the laboratory. This monitoring can avoid the influence of sewage quality on the monitoring results and provide accurate sulfide concentration, thereby providing a real and reliable reference concentration for the subsequent analysis of the relationship between sewage quality and sulfide concentration.

[0046] The impact correlation analysis module is used to compare the sulfide concentration collected by the sulfide monitoring equipment with the sulfide concentration obtained by sampling during the set trial monitoring period, and at the same time compare the collected water quality indicators with the appropriate water quality indicators for the normal operation of the sulfide monitoring equipment, thereby analyzing the correlation between sewage water quality and sulfide concentration.

[0047] It should be noted that the appropriate water quality indicators for the normal operation of sulfide monitoring equipment refer to water quality indicators that do not affect the normal monitoring of sulfide. They are determined by the manufacturing process of the sulfide monitoring equipment and can be obtained from the instructions for use of the sulfide monitoring equipment.

[0048] Furthermore, the correlation between sewage quality and sulfide concentration is analyzed as follows: the sulfide concentration collected by the sulfide monitoring equipment at each moment during the trial monitoring period is compared with the sulfide concentration obtained by sampling to obtain the sulfide concentration comparison difference at each moment.

[0049] The water quality indicators collected at each time during the trial monitoring period are compared with the appropriate water quality indicators for normal operation of the sulfide monitoring equipment to obtain the comparative differences of various water quality indicators at each time.

[0050] The absolute value of the sulfide concentration contrast difference at each moment forms a sulfide contrast change curve in a two-dimensional coordinate system with time as the horizontal axis and the absolute value of the sulfide concentration contrast difference as the vertical axis. Similarly, the absolute value of the water quality index contrast difference at each moment forms a water quality index contrast change curve in a two-dimensional coordinate system with time as the horizontal axis and the absolute value of the water quality index contrast difference as the vertical axis.

[0051] The sulfide concentration comparison change curve is mapped with the points on each water quality index comparison change curve. Since the sulfide concentration comparison change curve and the water quality index comparison change curve are formed based on the same horizontal axis, point mapping can be performed through the horizontal axis to obtain several point groups consisting of the sulfide concentration comparison change curve and the water quality index comparison change curve.

[0052] Get the slope of each point on the change curve respectively, and then import the slope difference between two points in each point group into the formula Calculate the correlation between sulfide concentration and water quality index CN, where Δk i It represents the slope difference between two points in the i-th point group, i represents the point group number formed by the sulfide concentration comparison curve and the water quality index comparison curve, i=1,2,......,n, n represents the number of point groups, and e represents a natural constant.

[0053] From the above correlation formula, we can see that the smaller the difference in slopes between two points in a certain point group on the change curve, the more consistent the slope changes of the two points, that is, when one change curve fluctuates at this point, the other change curve follows the fluctuation at this point, indicating that the two curves fluctuate synchronously at this point. In other words, they may have some degree of correlation.

[0054] In a further innovation of the above solution, in order to comprehensively determine the relationship between the curves, the correlation coefficient can be used to further determine the relationship between the curves. The correlation coefficient can provide a more accurate measure to describe the degree of linear correlation between the two curves.

[0055] The monitoring correction module is used to correct the sulfide concentration collected by the sulfide monitoring equipment in the formal monitoring after the set trial monitoring period based on the correlation between the sewage water quality and the sulfide concentration. The specific correction is implemented as follows: effective water quality indicators are screened out from the correlation between the sulfide concentration and various water quality indicators. The specific screening process is: comparing the correlation between the sulfide concentration and various water quality indicators with the correlation threshold set by the system. Exemplarily, the correlation threshold is 90%, and water quality indicators that reach the correlation threshold are screened out as effective water quality indicators.

[0056] A two-dimensional coordinate system is constructed with the contrast difference of effective water quality indicators as the horizontal axis and the contrast difference of sulfide concentration as the vertical axis. According to the contrast difference of sulfide concentration and the contrast difference of effective water quality indicators corresponding to each moment, an influence curve of sulfide concentration and effective water quality indicators is formed in the constructed two-dimensional coordinate system.

[0057] In the formal monitoring after the set trial monitoring period, water quality monitoring equipment is used to monitor the effective water quality indicators of the sewage outlet, and compared with the appropriate effective water quality indicators of the normal operation of the sulfide monitoring equipment to obtain the effective water quality indicator contrast difference, and then the sulfide concentration contrast difference corresponding to the effective water quality indicator contrast difference is extracted from the influence curve of sulfide concentration and effective water quality indicators.

[0058] The actual sulfide concentration is obtained by adding the sulfide concentration collected by the sulfide monitoring equipment to the sulfide concentration contrast difference corresponding to the effective water quality index contrast difference, thereby realizing the monitoring correction of sulfide.

[0059] The response monitoring and early warning module is used to set the analysis cycle in the formal monitoring. For example, the analysis cycle can be analyzed on a monthly basis, and then the response time of the sulfide monitoring equipment each time it monitors the sulfide concentration is recorded within the analysis cycle, where the response time refers to the time required from the sulfide monitoring equipment sensing the change in sulfide concentration to outputting the corresponding data, and the response time is calculated by comparing it with the ideal response time of the sulfide monitoring equipment. The specific calculation is At the same time, a response change curve is formed according to the response time of each sulfide concentration monitoring, and then the response change rate is extracted from the response change curve. The response change curve takes the monitoring time of each sulfide concentration monitoring as the horizontal axis and the response time of each sulfide concentration monitoring as the vertical axis, thereby forming a response change curve. The response change rate can be obtained by referring to the change rate of the sewage discharge change curve. The larger the response change rate, the greater the fluctuation of the response time.

[0060] It is important to understand that the ideal response time of sulfide monitoring equipment is the fastest response time that the monitoring equipment can achieve under ideal conditions. The ideal response time is a technical limit value, which represents the shortest time required for the monitoring equipment to output relevant data after detecting input changes. It depends on the design, technical specifications and internal working principles of the monitoring equipment. Manufacturers usually clearly list the ideal response time in the technical specification sheet of the product.

[0061] The response timeliness of the sulfide monitoring equipment is combined with the response change rate to calculate the response abnormality index. The specific calculation is to calculate the average of the response timeliness obtained by each monitoring of the sulfide concentration, and combine it with the response change rate through the expression

[0062] The response anomaly index of each analysis cycle is obtained, where U represents a set constant, and U>1. For example, U=4. From the formula, it can be seen that the smaller the response timeliness, the greater the response change rate when the response change rate is positive, and the greater the response anomaly index, since the response change rate can be positive or negative. When the response change rate is negative, the greater the response change rate, the smaller the response anomaly index.

[0063] The response abnormality index of the sulfide monitoring equipment in each analysis cycle is compared with the allowable response abnormality index set by the system. For example, the allowable response abnormality index can be 0.3. If the response abnormality index of the sulfide monitoring equipment in a certain analysis cycle is greater than the allowable response abnormality index, an early warning is initiated on the end date of the analysis cycle.

[0064] It is important to know that with the continuous use of sulfide monitoring equipment, its performance will decay, making its response time less and less than the ideal response time. In addition, when the sewage discharge volume shows an upward trend during irregular periods, the sewage flow rate is fast, which makes the response untimely and causes the original adjusted monitoring frequency to be difficult to meet the monitoring needs. At this time, the use of response monitoring can provide a remedy for this situation, and then promptly identify the monitoring anomalies of the sulfide monitoring equipment, providing a time guarantee for subsequent processing or replacement of more sensitive sulfide monitoring equipment.

[0065] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A sulfide monitoring system for a sewage outlet, characterized in that ,include: The sewage discharge collection module is used to allow the user to select a historical interval and divide each discharge day into multiple time periods within the interval according to the set time interval, thereby obtaining the sewage discharge volume of each discharge day in each time period; The sewage discharge law analysis module is used to analyze the sewage discharge volume in different time periods on each discharge day, identify regular time periods and irregular time periods, and calculate the effective sewage discharge volume in these two time periods respectively; A sewage flow rate acquisition module is used to determine the sewage flow rates of the regular time period and the irregular time period according to the effective sewage discharge volume in the two time periods from the corresponding relationship between the discharge volume and the sewage flow rate; A monitoring frequency adjustment module, used to dynamically adjust the monitoring frequency of the sulfide monitoring equipment in regular and irregular time periods by comparing the sewage flow rate in these two time periods with the non-interference flow rate of the sulfide monitoring equipment; The sewage discharge monitoring module is used to monitor the sulfide concentration and water quality indicators by using the sulfide monitoring equipment and water quality monitoring equipment arranged at the sewage discharge outlet after adjusting the monitoring frequency, and to sample the sewage at the sewage discharge outlet to obtain the sulfide concentration data; The impact correlation analysis module is used to compare the sulfide concentration collected by the sulfide monitoring equipment with the sulfide concentration obtained by sampling during the set trial monitoring period, and compare the collected water quality indicators with the appropriate water quality indicators of the normal operation of the sulfide monitoring equipment to analyze the correlation between sewage water quality and sulfide concentration; The monitoring correction module is used to correct the sulfide concentration collected by the sulfide monitoring equipment in the formal monitoring after the set trial monitoring period based on the correlation between the sewage water quality and the sulfide concentration.

2. A sulfide monitoring system for a sewage outlet as claimed in claim 1, characterized in that: The process of analyzing the time period regularity of sewage discharge in different time periods on each discharge day is as follows: With the date of the discharge day as the horizontal axis and the sewage discharge volume as the vertical axis, a number of points are marked in the constructed coordinate system for the sewage discharge volume on each discharge day in the same period, to form a sewage discharge volume change curve corresponding to each period, and obtain the change rate of the change curve; The stability of sewage discharge corresponding to each period is calculated by taking the reciprocal of the natural constant as the base and the absolute value of the change rate of the sewage discharge change curve corresponding to each period as the exponent; The sewage discharge stability corresponding to each time period is compared with the initial threshold of the system. If the sewage discharge stability corresponding to a certain time period is greater than or equal to the initial threshold of the system, it is recognized that the sewage discharge volume of this time period has regularity; otherwise, it is recognized that the sewage discharge volume of this time period has no regularity.

3. A sulfide monitoring system for a sewage outlet as claimed in claim 2, characterized in that: The regular time periods and irregular time periods are identified as follows: The time period during which the sewage discharge volume has regularity is identified as a regular time period, and the time period during which the sewage discharge volume has no regularity is identified as an irregular time period.

4. A sulfide monitoring system for a sewage outlet as claimed in claim 2, characterized in that: The calculation process of the effective sewage discharge in these two periods is as follows: Take the average of the sewage discharge volume on each discharge day during the regular period to obtain the effective sewage discharge volume corresponding to the regular period; Extract the change rate sign of the sewage discharge change curve corresponding to the irregular period. If the change rate sign of the sewage discharge change curve corresponding to a certain irregular period is negative, then the maximum sewage discharge of the irregular period in each discharge day is taken as the effective sewage discharge corresponding to the irregular period. Otherwise, the maximum sewage discharge of the irregular period in each discharge day is taken as the effective sewage discharge corresponding to the irregular period. max Combined with the change rate λ of the sewage discharge change curve corresponding to the irregular period, the expression Q 有效 =Q max *(1+λ) to obtain the effective sewage discharge Q corresponding to the irregular period 有效 .

5. A sulfide monitoring system for a sewage outlet as claimed in claim 1, characterized in that: The dynamic adjustment of the monitoring frequency of the sulfide monitoring equipment during these two time periods is implemented as follows: The sewage flow rate in regular and irregular time periods is compared with the non-interference flow rate corresponding to the sulfide monitoring equipment. If the sewage flow rate in a certain period does not reach the non-interference flow rate, the default monitoring frequency of the sulfide monitoring equipment is used for monitoring in that period. If the sewage flow rate in a certain period reaches the non-interference flow rate, the sewage flow rate in that period is compared with the non-interference flow rate, and the required monitoring frequency of that period is calculated in combination with the default monitoring frequency. The specific calculation formula is: Where V represents the sewage flow rate, V0 represents the non-interference flow rate, f0 represents the default monitoring frequency, and f represents the demand monitoring frequency; Obtain the monitoring frequency range that the sulfide monitoring equipment can achieve, and extract the upper limit monitoring frequency from it, and then compare the demand monitoring frequency of the period with the upper limit monitoring frequency. If the demand monitoring frequency of the period is less than the upper limit monitoring frequency, monitor at the demand monitoring frequency during the period; if the demand monitoring frequency of the period is higher than or equal to the upper limit monitoring frequency, monitor at the upper limit monitoring frequency during the period.

6. A sulfide monitoring system for a sewage outlet as claimed in claim 1, characterized in that: The correlation between the sewage quality and the sulfide concentration is analyzed as follows: Compare the sulfide concentration collected by the sulfide monitoring equipment at each time during the trial monitoring period with the sulfide concentration obtained by sampling to obtain the sulfide concentration comparison difference at each time; Compare the water quality indicators collected at each time during the trial monitoring period with the appropriate water quality indicators for normal operation of the sulfide monitoring equipment to obtain the comparative differences of various water quality indicators at each time; The absolute value of the sulfide concentration contrast difference at each moment forms a sulfide contrast change curve in a two-dimensional coordinate system with time as the horizontal axis and the absolute value of the sulfide concentration contrast difference as the vertical axis. Similarly, the absolute value of the water quality index contrast difference at each moment forms a water quality index contrast change curve in a two-dimensional coordinate system with time as the horizontal axis and the absolute value of the water quality index contrast difference as the vertical axis. The sulfide concentration comparison change curve is mapped with the points on the water quality index comparison change curve respectively, so as to obtain a plurality of point groups consisting of the sulfide concentration comparison change curve and the water quality index comparison change curve; Get the slope of each point on the change curve respectively, and then import the slope difference between two points in each point group into the formula Calculate the correlation between sulfide concentration and water quality index CN, where Δk i It represents the slope difference between two points in the i-th point group, i represents the point group number formed by the sulfide concentration comparison curve and the water quality index comparison curve, i=1,2,......,n, n represents the number of point groups, and e represents a natural constant.

7. A sulfide monitoring system for a sewage outlet as claimed in claim 6, characterized in that: The correction of the sulfide concentration collected by the sulfide monitoring equipment in the formal monitoring after the set trial monitoring period is implemented as follows: Screen out effective water quality indicators from the correlation between sulfide concentration and various water quality indicators; A two-dimensional coordinate system is constructed with the effective water quality index contrast difference as the horizontal axis and the sulfide concentration contrast difference as the vertical axis, and an influence curve of sulfide concentration and effective water quality index is formed in the constructed two-dimensional coordinate system according to the sulfide concentration contrast difference and the effective water quality index contrast difference corresponding to each moment; In the formal monitoring after the set trial monitoring period, the effective water quality index of the sewage outlet is monitored by water quality monitoring equipment, and compared with the appropriate effective water quality index of the normal operation of the sulfide monitoring equipment to obtain the effective water quality index contrast difference, and then the sulfide concentration contrast difference corresponding to the effective water quality index contrast difference is extracted from the influence curve of sulfide concentration and effective water quality index; The sulfide concentration collected by the sulfide monitoring equipment is corrected by combining the sulfide concentration contrast difference corresponding to the effective water quality index contrast difference.

8. A sulfide monitoring system for a sewage outlet as claimed in claim 7, characterized in that: The effective water quality index screening method is: compare the correlation between sulfide concentration and various water quality indexes with the correlation threshold set by the system, and screen out water quality indexes that reach the correlation threshold as effective water quality indexes.

9. A sulfide monitoring system for a sewage outlet as claimed in claim 1, characterized in that: It also includes a response monitoring and early warning module, which is used to set an analysis cycle in formal monitoring, and then record the response time of the sulfide monitoring equipment each time it monitors the sulfide concentration within the analysis cycle, and compare it with the ideal response time of the sulfide monitoring equipment to calculate the response timeliness, and at the same time form a response change curve based on the response time of each monitoring of the sulfide concentration, and then extract the response change trend from the response change curve; The response timeliness of the sulfide monitoring equipment is combined with the response change trend to calculate the response anomaly index; The response abnormality index of the sulfide monitoring equipment in each analysis cycle is compared with the allowable response abnormality index set by the system. If the response abnormality index of the sulfide monitoring equipment in a certain analysis cycle is greater than the allowable response abnormality index, an early warning is initiated on the end date of the analysis cycle.

10. A sulfide monitoring system for a sewage outlet as claimed in claim 9, characterized in that: The response change curve is formed as follows: The monitoring time of each sulfide concentration monitoring is taken as the horizontal axis, and the response time of each sulfide concentration monitoring is taken as the vertical axis, thereby forming a response change curve.

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