ORP-based underground water organic pollution on-line monitoring system

Abstract

The invention provides an ORP-based underground water organic pollution online monitoring system, and relates to the technical field of underground water pollution intelligent management, the ORP-based underground water organic pollution online monitoring system comprises a monitoring device arranged in a target well and used for monitoring organic pollutants in the target well, and different monitoring probe combinations in the monitoring device are determined according to estimated pollutant types of the target well; and the processing device is used for analyzing the monitoring result of the monitoring device and determining the underground water organic pollution type of the target well. According to the invention, common and low-cost ORP, nitrate, oil film and water level monitoring indexes are used, correlation with the existence of organic matters is carried out based on a natural attenuation theory, the change amplitude of the indexes is monitored, a complex underground water background value is avoided, and the applicability is improved; and the nitrate consumption process is advanced and strengthened by modifying the placement position and package of the nitrate monitoring probe, so that the early warning accuracy is improved, and the method is of great significance to underground water risk management and control of enterprises.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent management of groundwater pollution and is applied to the daily groundwater environment management of enterprises. Specifically, it relates to an online monitoring system for organic pollution of groundwater based on ORP. Background Art

[0002] The results of soil and groundwater surveys show that organic pollution of groundwater is common. Especially in the petrochemical industry, due to the large reserves and strong harmfulness of the substances themselves, organic pollution of groundwater widely exists. It is difficult to repair soil and groundwater pollution. Effective pollution prevention and timely detection are the key points for enterprises to prevent and control groundwater pollution. At present, monitoring equipment for organic pollutants often needs to pump water into the analysis cabin regularly for detection, and online monitoring of pollution cannot be achieved. Moreover, the prices of currently mature online monitoring equipment on the market are relatively high, making it difficult for enterprises to purchase. A small number of equipment cannot form an effective monitoring network.

[0003] Currently, routine groundwater detection includes multiple parameters such as pH (hydrogen ion concentration), conductivity, nitrate, etc. Among them, there are many monitoring devices for five parameters (pH, temperature, DO, ORP, conductivity), and the prices range from several thousand yuan to ten thousand yuan. The overall price is lower than that of organic pollutant detection equipment and is easy to deploy at multiple points. Based on the theory of natural attenuation, most pollutants, except for some chlorinated hydrocarbons, undergo aerobic biodegradation after entering groundwater, consuming oxygen and oxides. According to research, the consumption order is nitrate, sulfate, etc., but oxygen is mostly affected. And experience shows that the DO (dissolved oxygen) probe is greatly affected by the detection environment, and the solution in the probe needs to be replaced regularly, which is difficult to maintain. In the biodegradation reaction system, ORP (oxidation-reduction potential) will continuously decrease as the reaction progresses. By monitoring the changes in ORP and the changes in nitrate, which is the second-order consumption, in the reaction system, the occurrence of natural attenuation of organic matter can be effectively judged, and rapid monitoring of pollution can be achieved.

[0004] Currently, ORP is widely used as an indicator for reaction stages, but it has not been used as an online monitoring indicator for organic matter in groundwater. Moreover, due to the extremely sensitive ORP index of groundwater, it is easily affected by daily changes such as rainfall, and the basic ORP values vary in different regions. Therefore, at present, the ORP index cannot be effectively applied to the online monitoring of organic pollution in groundwater.

[0005] In view of the problems of the prior art, the present invention provides an online monitoring system for organic pollution of groundwater based on ORP. Summary of the Invention

[0006] In view of the problems of the current existing technologies, the present invention provides an online monitoring system for organic pollution of groundwater based on ORP, and the system includes:

[0007] A monitoring device, which is arranged in a target well and is used for monitoring organic pollutants in the target well. Among them, according to the estimated pollutant types of the target well, different combinations of monitoring probes in the monitoring device are determined;

[0008] A processing device, which is used for analyzing the monitoring results of the monitoring device to determine the types of organic pollution of groundwater in the target well.

[0009] According to an embodiment of the present invention, the monitoring device includes but is not limited to: an oxidation-reduction potential monitoring probe, a water level monitoring probe, an oil film monitoring probe, and a nitrate monitoring probe.

[0010] According to an embodiment of the present invention, the installation depths of the oxidation-reduction potential monitoring probe and the water level monitoring probe are at a preset position below the lowest water level line, the installation depth of the nitrate monitoring probe is below the oxidation-reduction potential monitoring probe and the water level monitoring probe, and the installation depth of the oil film monitoring probe is at a preset position above the highest water level line.

[0011] According to an embodiment of the present invention, when the estimated pollutant types of the target well include benzene ring type pollution, the oxidation-reduction potential monitoring probe, the water level monitoring probe, and the oil film monitoring probe are used as the combination of the monitoring probes.

[0012] According to an embodiment of the present invention, when the estimated pollutant types of the target well do not include benzene ring type pollution, the oxidation-reduction potential monitoring probe, the water level monitoring probe, and the nitrate monitoring probe are used as the combination of the monitoring probes.

[0013] According to an embodiment of the present invention, a cylindrical drainage pipe formed by oil entering but water not entering the membrane is arranged above the nitrate monitoring probe, and a detection tank formed by water entering but oil not entering the membrane is arranged at the position where the nitrate monitoring probe is located.

[0014] According to an embodiment of the present invention, the system further includes: an initialization device, which is used for training the combination of monitoring probes and recording data. Among them, the training period of the oxidation-reduction potential monitoring probe is not less than a first preset period, the training periods of the oil film monitoring probe and the nitrate monitoring probe are not less than a second preset period, and the training period of the water level monitoring probe is not less than a third preset period.

[0015] According to an embodiment of the present invention, the processing device includes an index setting module, which is used for setting the monitoring indexes of each monitoring probe. Among them:

[0016] The oxidation-reduction potential monitoring probe includes a numerical change index A1 and a numerical change index A2:

[0017] A1: The value is ≥ 50% of the 5-day moving average value for 5 consecutive days;

[0018] A2: The value is within ±50% of the moving average value for 5 consecutive days;

[0019] The water level monitoring probe includes a numerical change index B1 and a numerical change index B2:

[0020] B1: The water level fluctuation > 10 cm for 2 consecutive days;

[0021] B2: The water level fluctuation ≤ 10 cm for 2 consecutive days;

[0022] The oil film monitoring probe includes a numerical change index C1 and a numerical change index C2. Among them, the index C1 and index C2 are set for the pollution of non-aqueous phase liquid containing benzene rings;

[0023] The nitrate monitoring probe includes a numerical change index D1 and a numerical change index D2:

[0024] D1: The value is ≥ 30% of the 5-day moving average value for 5 consecutive days;

[0025] D2: The value is within ±30% of the moving average value for 5 consecutive days.

[0026] According to an embodiment of the present invention, the processing device includes a pollution judgment module, which determines the type of groundwater organic pollution in the target well based on the monitoring results of the monitoring probe combination, where:

[0027] When the predicted pollutant type in the target well includes benzene ring pollution, the organic monitoring judgment of benzene ring-containing pollutants is as follows:

[0028] The simultaneous establishment of A1 and B2 indicates organic pollution of benzene ring-containing pollutants;

[0029] The simultaneous establishment of A1, B2, and C2 indicates that there may be a change in redox potential caused by rainfall but there is no benzene ring-containing organic pollution;

[0030] The simultaneous establishment of A2 and C2 indicates the absence of benzene ring-containing organic pollution;

[0031] The simultaneous establishment of A1, B2, and C1 indicates the existence of non-aqueous phase liquid pollution containing benzene rings.

[0032] According to an embodiment of the present invention, when the predicted pollutant type in the target well does not include benzene ring pollution, the monitoring judgment of common organic pollutants is as follows:

[0033] The simultaneous establishment of A1 and B2 indicates the existence of organic pollution;

[0034] The simultaneous establishment of A1, B1, and D1 indicates that there may be changes in redox potential and nitrate caused by rainfall, but there is no organic pollution;

[0035] The simultaneous establishment of A1, B2, and D1 indicates that there may be organic pollution.

[0036] According to another aspect of the present invention, there is also provided an online monitoring method for organic pollution in groundwater based on ORP, which is executed by the system described in any one of the above. The method includes:

[0037] Monitor the organic pollutants in the target well through the monitoring device set in the target well. Among them, according to the estimated pollutant types in the target well, determine different combinations of monitoring probes in the monitoring device;

[0038] Analyze the monitoring results of the monitoring device through the processing device to determine the types of organic pollution in the groundwater of the target well.

[0039] According to an embodiment of the present invention, the method includes:

[0040] Collect the basic data of the target well, determine whether there are benzene ring pollutants, and determine the selected combination of monitoring probes;

[0041] Determine the monitoring indicators of each monitoring probe, and arrange the monitoring probes at different monitoring depths;

[0042] When arranging the monitoring probes, modify the nitrate monitoring probe, wrap a cylindrical drainage pipe composed of oil inlet and non-membrane water inlet above, and wrap a detection tank composed of water inlet and non-membrane oil inlet below;

[0043] After the arrangement is completed, perform data accumulation machine training on the redox potential monitoring probe, oil film monitoring probe, and nitrate monitoring probe at different times, and directly import the water level monitoring probe according to the historical change data;

[0044] After the training is completed, start online monitoring. According to the data change range of the selected monitoring indicators, perform coupling analysis, and judge whether there is organic pollution according to the coupling result, and give an early warning.

[0045] According to another aspect of the present invention, there is also provided a storage medium, which includes a series of instructions for executing the method steps described in any one of the above.

[0046] The present invention provides an online monitoring system for organic pollution in groundwater based on ORP. Compared with the prior art, it has the following advantages:

[0047] The present invention uses common and low-cost ORP, nitrate, oil film, and water level monitoring indicators. Based on the theory of natural attenuation, it is correlated with the presence of organic matter, monitors the change range of the indicators, avoids complex groundwater background values, improves applicability, and advances and strengthens the nitrate consumption process by modifying the placement position and packaging of the nitrate monitoring probe, improving the early warning accuracy, which is of great significance for the groundwater risk control of enterprises. The online monitoring system of the present invention has a low cost and does not require manual analysis, and can be used as an effective means for the daily groundwater environment management of enterprises, improving the enterprise's site pollution risk control ability.

[0048] Other features and advantages of the present invention will be described in the following specification, and in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings. Brief Description of the Drawings

[0049] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0050] Figure 1 Shows the structural block diagram of an online monitoring system for groundwater organic pollution based on ORP according to an embodiment of the present invention;

[0051] Figure 2 Shows a schematic diagram of the change of ORP in the presence of organic pollution according to an embodiment of the present invention;

[0052] Figure 3 Shows a schematic diagram of the layout of nitrate monitoring probes according to an embodiment of the present invention;

[0053] Figure 4 Shows a diagram of the monitoring index settings of different monitoring probes according to an embodiment of the present invention;

[0054] Figure 5 Shows a flowchart of the steps of an online monitoring method for groundwater organic pollution based on ORP according to an embodiment of the present invention;

[0055] Figure 6 Shows a curve graph of the monitoring results for Enterprise A according to an embodiment of the present invention;

[0056] Figure 7 Shows a curve graph of the monitoring results for Enterprise B according to an embodiment of the present invention;

[0057] Figure 8 Shows a curve graph of the monitoring results for Enterprise C according to an embodiment of the present invention;

[0058] Figure 9 Shows the monitoring result curve graph for Enterprise D according to an embodiment of the present invention;

[0059] Figure 10 Shows the monitoring result curve graph for Enterprise E according to an embodiment of the present invention.

[0060] In the accompanying drawings, the same components are denoted by the same reference numerals. Additionally, the accompanying drawings are not drawn to actual scale. Detailed implementation manners

[0061] To make the objectives, technical solutions, and advantages of the present invention clearer, the following further elaborates on the embodiments of the present invention in conjunction with the accompanying drawings.

[0062] Currently, ORP is widely used as an indicator for the reaction stage, but it has not been used as an online monitoring indicator for groundwater organic matter. In the 1970s and 1980s, foreign standards used the ORP indicator as a detection standard for qualified pool disinfection. It was found that ORP is correlated with the residual chlorine content and pH in the pool and can be used as a comprehensive indicator to indicate the disinfection result (Bergendahl J.A., LSM S. Oxidation reduction potential as a measure o disinfection effectiveness for chlorination of wastewater [J]. Environ. Prog. 2005, 24(2): 214 - 222.). In wastewater treatment, there are also studies showing that ORP can represent the pretreatment effect of Fenton and play a good role in controlling the dosage of Fenton reagent (Wu H., Wang S. Impacts of operating parameters on oxidation - reduc tion potential and pretreatment efficacy in the pretreatment of printing and dyeing wastewater by Fenton process [J]. J. Hazard. Mater., 2012, 243(4)86 - 94.). There are also literatures indicating that based on the theory of natural attenuation, during the biodegradation process, oxidants such as oxygen are consumed, resulting in a decrease in groundwater ORP. Through statistical calculation, the ORP at the polluted site in the contaminated area is effectively reduced compared to the initial point. However, due to the fact that groundwater ORP is easily affected by rainfall and other factors, and the basic ORP values vary from place to place, it cannot be effectively applied to the online monitoring of groundwater organic pollution.

[0063] The prior art (CN108751281A) discloses an intelligent monitoring system for industrial park wastewater treatment. The system includes: a number of Internet of Things sensors for collecting in real time the monitoring data of corresponding process links in the wastewater treatment process and uploading them to a server; the server for processing the monitoring data from the Internet of Things sensors to obtain the real-time monitoring parameters of the corresponding process links and evaluating the monitoring parameters according to the monitoring standards to obtain an evaluation result; and a monitoring terminal for visually displaying the monitoring parameters according to the evaluation result. Implementing the present invention can centrally monitor and display the monitoring data of each process link in the industrial park wastewater treatment process, thereby realizing the intelligent and centralized supervision of the industrial park wastewater treatment process.

[0064] However, the prior art uses the ORP index to measure the reaction state of ferrous ions in industrial wastewater treatment. This process does not involve a spontaneous biodegradation process, but only the process supervision of a chemical reaction process, and does not effectively screen the sensitive and variable ORP data. Moreover, this prior art does not involve the strengthening of indicators, does not strengthen the nitrate index, and cannot be directly applied to the field of groundwater monitoring.

[0065] The prior art (CN218331536U) provides an online monitoring and feedback system for the groundwater remediation effect. It includes an online monitoring module and an automatic control module; the online monitoring module is electrically connected to the automatic control module, and the automatic control module is electrically connected to a computer in a data processing center; the online monitoring module includes an underground water flow direction and velocity meter and a water quality parameter meter; the probes of the underground water flow direction and velocity meter and the water quality parameter meter are installed in a monitoring well. This system can online detect the construction environment, conventional groundwater parameters, and characteristic pollution parameters in groundwater, and at the same time use the monitoring results as a reference basis to be real-time fed back to a remote monitoring platform or a groundwater remediation system, timely modify and adjust the groundwater remediation process parameters, which is conducive to the realization of the remediation effect and the control of costs and cycles.

[0066] However, the prior art only detects the main measurable parameters on the market, including the five groundwater parameters, the five pollution parameters, the wind direction and rainfall parameters, etc., does not conduct comprehensive data analysis, does not consider the reaction changes during the remediation process, etc., and cannot achieve monitoring and early warning, and is not suitable for the use environment of the present invention.

[0067] The prior art (CN103347820B) provides a device for treating water stored in a reservoir to remove pollutants, which has a supply line for receiving water to be treated and a bypass valve for controlling the flow of water through the supply line by allowing water to flow through a flow line in a regulated manner. The venturi valve generates a vacuum in the supply line starting from the ozone generator to add ozone to the water to be treated at a controlled rate in response to the flow rate of water through the flow line, and the generated degree of vacuum depends on the flow rate. A sensor probe measures the oxidation-reduction potential of the water and supplies hydrogen peroxide to the water at a controlled rate depending on the oxidation-reduction potential level. Ozone and hydrogen peroxide are mixed with the water in a multi-tube cyclone separator unit to allow the over-ozonation reaction of the treated water to occur, and the treated water is returned to the reservoir.

[0068] However, the prior art uses the ORP index mainly focusing on monitoring the disinfection effects of ozone and hydrogen peroxide, without discussing the correlation of the ORP index with organic substances, nor can it be used as the main index for monitoring and alarming of organic substances, which is different from the present invention. Moreover, the prior art does not involve the relationship between ORP and multiple indexes and cannot be used in the field of monitoring organic substances in groundwater, which is essentially different from the present invention.

[0069] Conventional groundwater monitoring research mainly focuses on the change of monitoring mode, and there is less research on the selection of monitoring indexes. To sum up, the demand for enterprise organic pollution control is relatively strong. Moreover, the price of the organic substance on-line monitoring system on the market is expensive, and the cost is high, which is difficult for enterprises to bear, and it is difficult to form multi-point monitoring in enterprises. While the prices of devices for parameters such as the pH and ORP of groundwater are low, and they are effective indexes for on-line monitoring. At present, there are many cases in the prior art and the actual application process that use ORP as the monitoring index for the reaction process, but there are few applications for groundwater monitoring and the ORP change caused by non-chemical reactions based on the theory of natural attenuation. And after organic pollution enters the ground, it will inevitably cause biodegradation, resulting in changes in the ORP in the system and changes in oxidants such as nitrates. However, the ORP index is sensitive and variable, and the background values vary greatly in different regions. The present invention couples ORP data with other indexes (such as oil film monitoring, water level, nitrates, etc.) for comprehensive analysis to improve the accuracy of organic pollution monitoring and solve the problems of rapid discovery of organic pollution in enterprise groundwater and risk control.

[0070] In view of the above defects of the prior art, the present invention divides the background monitoring environment into two modes according to the presence of benzene-ring-containing pollutants in organic pollution, uses three-three combinations of four indicators of ORP, oil film monitoring, water level, and nitrate, and based on the theory of natural attenuation, judges whether there is organic pollution according to the coupled analysis of several indicator data. The water level indicator effectively controls the indication of the ORP indicator, the oil film indicator effectively identifies the presence of the NAPL phase, and by setting the depth and structural changes of the nitrate monitoring probe, the microbial degradation quickly enters the nitrate consumption mode, and the pollutants are concentrated in the detection environment to strengthen the nitrate change, realizing the effective judgment of organic pollution. And before use, the equipment is machine-trained, and the threshold is not set for the indicator value itself, but the change degree of the indicator value is emphasized to set the threshold, effectively avoiding the background values of various parameters of complex groundwater and making the data meaningful. Enterprise personnel can design the threshold requirements by themselves to meet the risk management and control requirements at different sensitive positions in the enterprise. The online monitoring system provided by the present invention has low cost and does not require manual analysis, and can be used as an effective means for the daily groundwater environment management of enterprises to improve the enterprise's site pollution risk management and control ability.

[0071] Figure 1 Fig. shows a structural block diagram of an online monitoring system for organic pollution in groundwater based on ORP according to an embodiment of the present invention.

[0072] An online monitoring system for organic pollution in groundwater based on ORP includes: a monitoring device and a processing device. Among them, the monitoring device is arranged in the target well and is used to monitor the organic pollutants in the target well. Further, according to the predicted pollutant types in the target well, different monitoring probe combinations in the monitoring device are determined. The processing device is used to analyze the monitoring results of the monitoring device to determine the types of organic pollution in the groundwater of the target well.

[0073] In one embodiment, as Figure 1 shown, the monitoring device includes but is not limited to: an oxidation-reduction potential (ORP) monitoring probe, a water level monitoring probe, an oil film monitoring probe, and a nitrate monitoring probe. Specifically, in actual application, an oxidation-reduction potential monitoring probe, an oil film detection probe or a nitrate monitoring probe, and a water level monitoring probe, a total of three probes are used as a monitoring probe combination and arranged in the well to indicate the pollution situation of organic pollutants.

[0074] In view of the situation that the online monitoring equipment for organic pollution in enterprise groundwater is expensive and the direct monitoring of organic matter is difficult, based on the aerobic biodegradation of most organic pollutants after entering the groundwater, which causes changes in indirect indicators, through the common and low-cost ORP indicator, supplemented by the coupling analysis of the monitoring data of nitrate, water level, and oil film monitoring probes, the focus changes from the instantaneous changes of indicators such as ORP and nitrate to the degree of change of indicator values over time (such as Figure 2) It can effectively avoid complex background values of groundwater parameters, and multiple indicators can effectively reduce the false alarm rate of a single indicator. It replaces expensive organic matter monitoring systems and effectively realizes real-time monitoring of organic pollutants.

[0075] In one embodiment, the installation depths of the redox potential monitoring probe and the water level monitoring probe are at a preset position below the lowest water level line, the installation depth of the nitrate monitoring probe is below the redox potential monitoring probe and the water level monitoring probe, and the installation depth of the oil film monitoring probe is at a preset position above the highest water level line. Further, the installation depths of the redox potential monitoring probe and the water level monitoring probe are placed 1 m below the lowest water level line, and the nitrate monitoring probe is placed 2 m below the lowest water level line to ensure that the biodegradation process of the pollution can quickly pass through the oxygen (O2) consumption stage and quickly enter the nitrate consumption process. The oil film monitoring probe is located 1 m above the highest water level line to prevent the redox potential monitoring probe from being contaminated.

[0076] In one embodiment, when the estimated pollutant types in the target well include benzene ring type pollution, the redox potential monitoring probe, the water level monitoring probe, and the oil film monitoring probe are used as the monitoring probe combination. When the estimated pollutant types in the target well do not include benzene ring type pollution, the redox potential monitoring probe, the water level monitoring probe, and the nitrate monitoring probe are used as the monitoring probe combination.

[0077] Specifically, collect the basic data of the enterprise (historical water level change data, locations of risk sources, lists of raw and auxiliary materials and products, possible pollutant types, etc.), judge whether there are benzene ring type pollutants, and thus judge what kind of monitoring probe combination needs to be built. After clarifying the monitoring probe combination, select the equipment detection indicators, and then use different monitoring depths to deploy the equipment.

[0078] Figure 3 Shows a schematic diagram of the layout of the nitrate monitoring probe according to an embodiment of the present invention.

[0079] As Figure 3 shown, a cylindrical drainage pipe composed of oil inlet and non-water inlet film is arranged above the nitrate monitoring probe, and a detection tank composed of water inlet and non-oil inlet film is arranged at the position where the nitrate monitoring probe is located.

[0080] Specifically, when deploying, the nitrate monitoring probe is modified, with a cylindrical drainage pipe composed of oil inlet and non-water inlet film wrapped above it and a detection tank composed of water inlet and non-oil inlet film wrapped below it.

[0081] Further, to further strengthen the biological degradation nitrate consumption stage, the nitrate monitoring probe is additionally packaged specifically. Above the probe is a cylindrical drainage pipe composed of oil inlet and non-membrane water inlet. The position where the probe is located is a detection tank composed of water inlet and non-membrane oil inlet. Pollutants gather through the drainage pipe and flow downward into the test tank. At a depth of more than 2m with less O2, nitrate is rapidly consumed, pollutants are gathered, and the change of nitrate is strengthened.

[0082] By setting the depth and structural changes of the nitrate monitoring probe, the present invention enables the microbial degradation to quickly enter the nitrate consumption mode, concentrates pollutants in the detection environment, strengthens the change of nitrate, effectively improves the effectiveness of the equipment, and ensures timely and reasonable early warning during the implementation process.

[0083] In one embodiment, an online monitoring system for organic pollution in ORP groundwater further includes: an initialization device, which is used to train the monitoring probe combination and record data. Among them, the training period of the oxidation-reduction potential monitoring probe is not less than the first preset period, the training period of the oil film monitoring probe and the nitrate monitoring probe is not less than the second preset period, and the training period of the water level monitoring probe is not less than the third preset period. Specifically, after the monitoring probes in the target well are installed, equipment initialization is required, and values are recorded for training. The training period of the oxidation-reduction potential monitoring probe is more than 1 month, the training period of the oil film monitoring probe / nitrate monitoring probe is more than 1 day, and the training period of the water level monitoring probe is more than 1 month. Considering the influence of wet, normal, and dry water periods, historical data input of the water level monitoring probe is supported.

[0084] Figure 4 Shows the monitoring index setting diagram of different monitoring probes according to an embodiment of the present invention.

[0085] In one embodiment, as Figure 1 shown, the processing device includes an index setting module, which is used to set the monitoring indexes of each monitoring probe. Specifically, the oil film monitoring probe monitors the NAPL-phase pollution containing benzene rings, uses ultraviolet fluorescence non-contact reaction, sets a threshold, and alarms when the threshold is exceeded. The oxidation-reduction potential monitoring probe and the nitrate monitoring probe mainly combine the detection value change rules, set the trend change range, and alarm when the change range is exceeded. The water level data of the water level monitoring probe is used as the analysis basis for other data.

[0086] Specifically, as Figure 4 shown, the oxidation-reduction potential monitoring probe includes a numerical change index A1 and a numerical change index A2, the water level monitoring probe includes a numerical change index B1 and a numerical change index B2, the oil film monitoring probe includes a numerical change index C1 and a numerical change index C2, and the nitrate monitoring probe includes a numerical change index D1 and a numerical change index D2.

[0087] Further, in the redox potential monitoring probe, A1: the value is ≥ 50% of the 5-day moving average value for 5 consecutive days; A2: the value is within ±50% of the moving average value for 5 consecutive days.

[0088] Further, in the water level monitoring probe, B1: the water level fluctuation > 10 cm for 2 consecutive days; B2: the water level fluctuation ≤ 10 cm for 2 consecutive days.

[0089] Further, in the oil film monitoring probe, indices C1 and C2 are set for the pollution of non-aqueous phase liquids containing benzene rings. Specifically, when the value detected by the oil film monitoring probe exceeds the set threshold, it indicates that index C1 is satisfied; when it does not exceed the set threshold, it indicates that index C2 is satisfied.

[0090] Further, in the nitrate monitoring probe, D1: the value is ≥ 30% of the 5-day moving average value for 5 consecutive days; D2: the value is within ±30% of the moving average value for 5 consecutive days.

[0091] In one embodiment, as Figure 1 shown, the processing device includes a pollution judgment module, which determines the type of organic pollution in the groundwater of the target well based on the monitoring results of the monitoring probe combination. Specifically, the monitoring results of the monitoring probe combination composed of three monitoring probes simultaneously enter the pollution judgment module, which is divided into organic monitoring judgment for pollutants containing benzene rings and common organic pollutant monitoring judgment. Data coupling is performed separately within different monitoring judgments to analyze organic pollution. Further, threshold settings are made for the numerical change ranges of the ORP index and the nitrate index, and index judgments are made based on the change ranges.

[0092] In one embodiment, when the estimated pollutant types in the target well include benzene ring pollution, the organic monitoring judgment for pollutants containing benzene rings is as follows:

[0093] The simultaneous establishment of A1 and B2 indicates organic pollution by pollutants containing benzene rings;

[0094] The simultaneous establishment of A1, B2, and C2 indicates that there may be a change in the redox potential caused by rainfall but no organic pollution by pollutants containing benzene rings;

[0095] The simultaneous establishment of A2 and C2 indicates no organic pollution by pollutants containing benzene rings;

[0096] The simultaneous establishment of A1, B2, and C1 indicates the presence of non-aqueous phase liquid phase pollution by pollutants containing benzene rings.

[0097] In one embodiment, when the estimated pollutant types in the target well do not include benzene ring pollution, the common organic pollutant monitoring judgment is as follows:

[0098] The simultaneous establishment of A1 and B2 indicates the presence of organic pollution;

[0099] The simultaneous establishment of A1, B1, and D1 indicates that there may be changes in redox potential and nitrate caused by rainfall, but there is no organic pollution.

[0100] The simultaneous establishment of A1, B2, and D1 indicates that there may be organic pollution.

[0101] The present invention can perform coupled analysis based on the changes of four parameters, namely ORP, nitrate, oil film, and water level, and is associated with organic pollution based on biological aerobic degradation to achieve real-time early warning of organic pollution.

[0102] It should be noted that in actual applications, enterprises can set thresholds according to their own management requirements to improve the alarm requirements, but they cannot be lower than the above alarm requirements. For example, in areas such as the factory boundary, the threshold range is reduced to improve the alarm sensitivity.

[0103] Enterprises currently still take regular groundwater sampling and testing for groundwater pollution, with an interval of more than half a year. However, groundwater pollution is difficult to detect, and this mode will lead to a lag in pollution discovery. The pollution spreads downstream with the groundwater, and there is even a risk of going out of the factory boundary. Once it goes out of the factory boundary, it may cause social and environmental events with a bad impact. Therefore, it is very important to conduct regular real-time monitoring of groundwater quality. Currently, there are few devices on the market for directly monitoring organic pollution, and the price is over several hundred thousand yuan. The high price is a heavy burden for enterprises, and the installation of single points cannot realize the construction of a monitoring network. The present invention uses common and low-cost monitoring indicators such as ORP, nitrate, oil film, and water level, is associated with the presence of organic matter based on the theory of natural attenuation, monitors the change range of indicators, avoids complex groundwater background values, improves applicability, and advances and strengthens the nitrate consumption process by modifying the placement position and packaging of nitrate to improve the early warning accuracy, which is of great significance for the groundwater risk control of enterprises.

[0104] Figure 5 It shows a step flowchart of an online monitoring method for organic pollution in groundwater based on ORP according to an embodiment of the present invention.

[0105] According to another aspect of the present invention, an online monitoring method for organic pollution in groundwater based on ORP is also provided, which is executed by an online monitoring system for organic pollution in groundwater based on ORP.

[0106] As Figure 5 shown, in step S501, the organic pollutants in the target well are monitored through a monitoring device arranged in the target well, wherein different combinations of monitoring probes in the monitoring device are determined according to the estimated pollutant types in the target well.

[0107] As Figure 5As shown, in step S502, the processing device analyzes the monitoring results of the monitoring device to determine the types of organic pollution in the groundwater of the target well.

[0108] An online monitoring method for organic pollution in groundwater based on ORP provided by the present invention has an overall process including: probe combination determination, equipment installation, machine training, monitoring, data analysis, and alarm feedback. Based on the natural attenuation process of organic matter entering groundwater, routine parameter monitoring with ORP as the main probe is carried out to achieve low-cost monitoring of organic pollutants.

[0109] Specifically, an online monitoring method for organic pollution in groundwater based on ORP includes:

[0110] Probe combination determination step: Collect the basic data of the target well (historical water level change data, location of risk sources, list of raw materials, auxiliary materials and products, possible pollutant types, etc.), and judge whether there are benzene ring pollutants to determine the selected monitoring probe combination.

[0111] Specifically, when the estimated pollutant types of the target well include benzene ring pollution, an oxidation-reduction potential monitoring probe, a water level monitoring probe, and an oil film monitoring probe are used as the monitoring probe combination. When the estimated pollutant types of the target well do not include benzene ring pollution, an oxidation-reduction potential monitoring probe, a water level monitoring probe, and a nitrate monitoring probe are used as the monitoring probe combination.

[0112] Equipment installation step: Determine the monitoring indicators of each monitoring probe, and arrange the monitoring probes at different monitoring depths.

[0113] Specifically, the oxidation-reduction potential monitoring probe includes numerical change index A1 and numerical change index A2, the water level monitoring probe includes numerical change index B1 and numerical change index B2, the oil film monitoring probe includes numerical change index C1 and numerical change index C2, and the nitrate monitoring probe includes numerical change index D1 and numerical change index D2.

[0114] Specifically, the installation depths of the oxidation-reduction potential monitoring probe and the water level monitoring probe are at a preset position below the lowest water level line, the installation depth of the nitrate monitoring probe is below the oxidation-reduction potential monitoring probe and the water level monitoring probe, and the installation depth of the oil film monitoring probe is at a preset position above the highest water level line.

[0115] Equipment installation step: When arranging the monitoring probes, transform the nitrate monitoring probe, wrap a cylindrical drainage tube composed of oil entering but water not entering the membrane above it, and wrap a detection tank composed of water entering but oil not entering the membrane below it.

[0116] Specifically, to further strengthen the biodegradation nitrate consumption stage, the nitrate monitoring probe is additionally packaged specifically. Above the probe is a cylindrical drainage pipe composed of oil inlet and non-membrane water inlet. The position where the probe is located is a detection tank composed of water inlet and non-membrane oil inlet. Pollutants gather through the drainage pipe and flow downward into the test tank. At a depth of more than 2m with less O2, nitrate is rapidly consumed, pollutants are gathered, and the change of nitrate is strengthened.

[0117] Machine training steps: After the layout is completed, data accumulation machine training is carried out on the redox potential monitoring probe, oil film monitoring probe, and nitrate monitoring probe at different times, and the water level monitoring probe is directly imported according to historical change data.

[0118] Specifically, the monitoring probe combination is trained and data is recorded. Among them, the training period of the redox potential monitoring probe is not less than the first preset period, the training periods of the oil film monitoring probe and the nitrate monitoring probe are not less than the second preset period, and the training period of the water level monitoring probe is not less than the third preset period.

[0119] Monitoring and alarm feedback steps: After the training is completed, online monitoring is started. According to the data change range of the selected monitoring indicators, coupling analysis is carried out, and whether there is organic pollution is judged according to the coupling result, and early warning is carried out.

[0120] Specifically, when the predicted pollutant types of the target well include benzene ring pollutants, the organic monitoring of benzene ring-containing pollutants is as follows:

[0121] The simultaneous establishment of A1 and B2 indicates organic pollution of benzene ring-containing pollutants;

[0122] The simultaneous establishment of A1, B2, and C2 indicates that there may be a change in redox potential caused by rainfall but no benzene ring organic pollution;

[0123] The simultaneous establishment of A2 and C2 indicates the absence of benzene ring organic pollution;

[0124] The simultaneous establishment of A1, B2, and C1 indicates the presence of benzene ring non-aqueous phase liquid phase pollution.

[0125] Specifically, when the predicted pollutant types of the target well do not include benzene ring pollutants, the monitoring of common organic pollutants is as follows:

[0126] The simultaneous establishment of A1 and B2 indicates the presence of organic pollution;

[0127] The simultaneous establishment of A1, B1, and D1 indicates that there may be changes in redox potential and nitrate caused by rainfall but no organic pollution;

[0128] The simultaneous establishment of A1, B2, and D1 indicates that there may be organic pollution.

[0129] The groundwater pollution risk in petroleum and petrochemical sites is high. According to the previous pollution investigation results, organic pollution in groundwater is relatively common. Combining with the requirements of environmental protection policies, if the standard is exceeded, pollution remediation must be carried out. The cost of site remediation is high and the difficulty is great. Discovering and controlling before the pollution spreads widely is the key to solving groundwater pollution. The present invention can realize the monitoring and early warning of organic matter by coupling analysis of conventional indicators with lower costs instead of expensive organic matter monitoring equipment. The installation cost for enterprises is low, and it is also easy to carry out multi-point monitoring to form a monitoring network, effectively monitoring the groundwater environment in the site, which is of great significance for the environmental protection management of enterprises.

[0130] An on-line monitoring system for groundwater organic pollution based on ORP provided by the present invention can also cooperate with a computer-readable storage medium. A computer program is stored on the storage medium, and the computer program is executed to run an on-line monitoring method for groundwater organic pollution based on ORP. The computer program can run computer instructions, and the computer instructions include computer program codes. The computer program codes can be in the form of source code, object code form, executable file or some intermediate forms, etc.

[0131] The computer-readable storage medium can include: any entity or device capable of carrying computer program codes, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0132] It should be noted that the content included in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice within the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0133] In one embodiment, for enterprise A, an on-line monitoring system and method for groundwater organic pollution based on ORP provided by the present invention are used for groundwater organic pollution monitoring.

[0134] First, collect the basic data of Enterprise A (historical water level change data, locations of risk sources, lists of raw and auxiliary materials and products, possible pollutant types, etc.). It is found that there are a large number of benzene series substances in the raw and auxiliary materials. Therefore, an organic monitoring system for pollutants containing benzene rings is used, and a combination of monitoring probes for ORP, oil film, and water level is selected. After determination, the equipment is arranged at different monitoring depths. During the arrangement, the installation depths of the ORP and water level probes are set at 1.5 m below the lowest water level line, and the oil film probe is placed 1.5 m above the highest water level line. There is a key protection area at the eastern factory boundary of the enterprise. Therefore, it is planned to place the equipment at the edge of the factory boundary. Due to the sensitive location, the index thresholds are set as follows: ORP: A1: The value for 5 consecutive days ≥ 30% of the 5-day moving average value; A2: The value for 5 consecutive days is within ±30% of the moving average value; Water level: B1: The water level fluctuation for 2 consecutive days > 12 cm; B2: The water level fluctuation for 2 consecutive days ≤ 12 cm; The threshold value of the oil film index is directly set to 1200 response value according to the empirical values of local experimental tests. After the arrangement, data accumulation of the equipment probes at different times is carried out, that is, machine training. The ORP probe accumulates data for one week, and the ORP training cycle is more than 2 months. The oil film probe accumulates data for 2 days, and the water level is directly imported according to the historical change data. The imported information includes the average water level of each month. After the training time, online monitoring begins, and the monitoring records are as Figure 6 shown. It is found that during the period from 4d to 9d, the decline rate of ORP reaches (120 - 52) / 120 > 30%, and the water level change does not exceed 12 cm, and the oil film response value changes significantly. It indicates that there may be dissolved-phase organic matter, and an alarm is sent to the enterprise.

[0135] In one embodiment, for Enterprise B, an online monitoring system and method for organic pollution in groundwater based on ORP provided by the present invention are used to monitor the organic pollution in groundwater.

[0136] First, collect the basic data of Enterprise B (historical water level change data, locations of risk sources, lists of raw materials, auxiliary materials and products, possible pollutant types, etc.). It is found that there are no benzene ring pollutants in the raw materials. Therefore, an organic monitoring system without benzene ring pollutants is used, and a combination of monitoring probes for ORP, nitrate, and water level is selected. After determination, the equipment is arranged at different monitoring depths. During the arrangement, the installation depths of the ORP and water level probes are set at 1.6 m below the lowest water level line, and the nitrate probe is placed 2.5 m below the lowest water level line. There is a key risk device in the west of the enterprise, so it is planned to place the equipment at the downstream edge of the device. Due to the sensitive location, the index thresholds are set as follows: ORP: A1: The value for 5 consecutive days ≥ 35% of the 5-day moving average value; A2: The value for 5 consecutive days is within ±35% of the moving average value; Water level: B1: The water level fluctuation for 2 consecutive days > 10 cm; B2: The water level fluctuation for 2 consecutive days ≤ 10 cm; Nitrate: D1: The value for 5 consecutive days ≥ 30% of the 5-day moving average value; D2: The value for 5 consecutive days is within ±30% of the moving average value. After the arrangement, data accumulation for different times is carried out on the equipment probes, that is, machine training. The ORP probe is trained for one week, the training cycle for ORP and nitrate is more than 2 months, and the water level is directly imported according to the historical change data. The imported information includes the average water level of each month. After the training time, online monitoring is started, and the monitoring records are as Figure 7 shown. It is found that during the period from 4d to 9d, the decline rate of ORP reaches (130 - 55) / 120 > 35%, and the water level change does not exceed 10 cm. The decline rate of nitrate is (12.4 - 6.2) / 12.4 > 30%. This indicates that there may be dissolved-phase organic matter present, and an alarm is sent to the enterprise.

[0137] In one embodiment, for Enterprise C, an online monitoring system and method for organic pollution in groundwater based on ORP provided by the present invention are used to monitor organic pollution in groundwater.

[0138] First, collect the basic data of enterprise C (historical water level change data, locations of risk sources, lists of raw materials, auxiliary materials and products, possible pollutant types, etc.). It is found that there are a large number of benzene series in the raw materials. Therefore, an organic monitoring system for pollutants containing benzene rings is used, and a combination of monitoring probes for ORP, oil film, and water level is selected. After determination, the equipment is arranged at different monitoring depths. During the arrangement, the installation depths of the ORP and water level probes are set at 2 m below the lowest water level line, and the oil film probe is placed 1.5 m above the highest water level line. There are no key protection areas around the enterprise, so it is planned to place the equipment in the downstream direction of the groundwater in the factory. The index thresholds are set respectively as follows: ORP: A1: The value for 5 consecutive days ≥ 45% of the moving average value every 5 days; A2: The value for 5 consecutive days is within ±45% of the moving average value; Water level: B1: The water level fluctuation for 2 consecutive days > 10 cm; B2: The water level fluctuation for 2 consecutive days ≤ 10 cm; The threshold value of the oil film index is directly set according to the empirical value of local experimental tests to be 1800 response values. After the arrangement, data accumulation for different times is carried out on the equipment probes, that is, machine training. The ORP probe accumulates data for one week, the ORP training cycle is more than 1 month, the oil film probe is for 1 day, and the water level is directly imported according to the historical change data. The imported information includes the average water level of each month. After the training time, online monitoring is started, and the monitoring records are as Figure 8 shown. It is found that on the 9th day, the oil film response value changes significantly and exceeds the response threshold of 1800. At this time, without waiting for the changes in ORP and water level, it can be judged that there may be dissolved-phase benzene ring-containing organic matter NAPL (non-aqueous phase liquid) phase present, and an alarm is sent to the enterprise.

[0139] In one embodiment, for enterprise D, a method for online monitoring of groundwater organic pollution using an ORP-based groundwater organic pollution online monitoring system provided by the present invention is adopted for groundwater organic pollution monitoring.

[0140] First, collect the basic data of Enterprise D (historical water level change data, locations of risk sources, lists of raw and auxiliary materials and products, possible pollutant types, etc.). It is found that there are no benzene ring pollutants in the raw and auxiliary materials. Therefore, an organic monitoring system without benzene ring pollutants is used, and a combination of monitoring probes for ORP, nitrate, and water level is selected. After determination, the equipment is arranged at different monitoring depths. During the arrangement, the installation depths of the ORP and water level probes are set at 1.8 m below the lowest water level line, and the nitrate probe is placed 3 m below the lowest water level line. There are key risk receptors in the west of the enterprise, so it is planned to place the equipment at the west factory boundary. Due to the sensitive location, the index thresholds are set as follows: ORP: A1: The value for 5 consecutive days ≥ 32% of the 5-day moving average value; A2: The value for 5 consecutive days is within ±32% of the moving average value; Water level: B1: The water level fluctuation for 2 consecutive days > 10 cm; B2: The water level fluctuation for 2 consecutive days ≤ 10 cm; Nitrate: D1: The value for 5 consecutive days ≥ 25% of the 5-day moving average value; D2: The value for 5 consecutive days is within ±25% of the moving average value. After the arrangement, data accumulation for different times is carried out on the equipment probes, that is, machine training. The ORP probe is trained for one week, the training cycle for ORP and nitrate is more than 1.5 months, and for the water level, since there is no historical change data, it is trained for 6 months. After the training time, online monitoring begins, and the monitoring records are as Figure 9 shown. It is found that during the period from 4d to 9d, the decline rate of ORP reaches (330 - 155) / 330 > 32%, and the decline rate of nitrate reaches (7.8 - 2.4) / 7.8 > 25%. However, the water level change exceeds 10 cm, indicating that factors such as possible rainfall may affect the ORP and nitrate indicators. Therefore, no alarm is issued to the enterprise.

[0141] In one embodiment, for Enterprise E, an online monitoring system and method for organic pollution in groundwater based on ORP provided by the present invention are used to monitor organic pollution in groundwater.

[0142] First, collect the basic data of enterprise E (historical water level change data, locations of risk sources, lists of raw materials, auxiliary materials and products, possible pollutant types, etc.). It is found that there are a large number of benzene series substances in the raw materials. Therefore, an organic monitoring system for benzene ring-containing pollutants is used, and a combination of monitoring probes for ORP, oil film, and water level is selected. After determination, the equipment is arranged at different monitoring depths. When arranging, the installation depths of the ORP and water level probes are set at 1.4 m below the lowest water level line, and the oil film probe is placed 1.5 m above the highest water level line. There are no key protection areas around the enterprise, so it is planned to place the equipment in the downstream direction of the groundwater in the factory. The index thresholds are set as follows: ORP: A1: The value for 5 consecutive days ≥ 50% of the 5-day moving average value; A2: The value for 5 consecutive days is within ±50% of the moving average value. Water level: B1: The water level fluctuation for 2 consecutive days > 10 cm; B2: The water level fluctuation for 2 consecutive days ≤ 10 cm. The threshold value of the oil film index is directly set to 1300 response value according to the empirical values of local experimental tests. After arrangement, data accumulation for different times is carried out on the equipment probes, that is, machine training. The ORP probe accumulates data for one week, and the ORP training cycle is more than 3 months. The oil film probe accumulates data for 1 day, and the water level is directly imported according to the historical change data. The imported information includes the average water level of each month. After the training time, online monitoring starts, and the monitoring records are as Figure 10 shown. It is found that during the period from 4d to 9d, the decline rate of ORP reaches (220 - 58) / 220 > 50%, the oil film response value has no obvious change, but the water level change exceeds 12 cm, indicating that there may be reasons such as rainfall affecting the ORP index. Therefore, no alarm is issued to the enterprise.

[0143] The present invention is proposed for the monitoring and early warning requirements of groundwater organic pollution that enterprises are concerned about. Aiming at the problem that the current real-time monitoring equipment for organic pollution is expensive, common low-cost indicators such as ORP, nitrate, oil film, and water level are used for data coupling analysis. The change of some indicators is strengthened through the design of probe depth and the change of collection methods. Based on the natural attenuation theory, the change range of the indicator values rather than the values themselves is associated with organic pollution, avoiding the background values of complex site index adoption numbers, and realizing the effective monitoring and early warning of organic pollution. It can effectively solve the problem that it is difficult for enterprises to detect and control site pollution, and the low-cost monitoring equipment can effectively improve the layout of the monitoring network by enterprises, and effectively enhance the groundwater risk control ability of enterprises.

[0144] In summary, the present invention provides an online monitoring system for groundwater organic pollution based on ORP. Compared with the prior art, it has the following advantages:

[0145] The present invention uses common and low-cost ORP, nitrate, oil film, and water level monitoring indicators. Based on the theory of natural attenuation, it correlates with the presence of organic matter, monitors the change range of the indicators, avoids complex groundwater background values, improves applicability, and advances and strengthens the nitrate consumption process by modifying the placement position and packaging of the nitrate monitoring probe, thereby improving the warning accuracy. This is of great significance for the groundwater risk control of enterprises. The on-line monitoring system of the present invention has a low cost and does not require manual analysis, and can be used as an effective means for the daily groundwater environment management of enterprises, improving the enterprise's ability to control the pollution risk of the site.

[0146] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not imply limitation.

[0147] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0148] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0149] Certain terms are used throughout this application to refer to particular system components. As those skilled in the art will recognize, the same components may typically be referred to by different names, and thus this application does not intend to distinguish between components that differ only in name and not in function. In this application, the terms “comprise,” “include,” and “have” are used in an open-ended fashion and should thus be interpreted to mean “including but not limited to...” Additionally, the terms “substantially,” “essentially,” or “approximately” as may be used herein refer to the industry-accepted tolerances for the corresponding terms. The term “coupled” as may be used herein includes direct coupling and indirect coupling via additional components, elements, circuits, or modules, where for indirect coupling, the intervening components, elements, circuits, or modules do not change the information of the signal but may adjust its current level, voltage level, and / or power level. Inferred coupling (e.g., where one element is inferred to be coupled to another element) includes direct and indirect coupling between two elements in the same manner as “coupled.”

[0150] As used herein, the phrase “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase “one embodiment” or “an embodiment” throughout the specification are not necessarily all referring to the same embodiment.

[0151] Embodiments of the present invention are provided by way of example and description, and are not exhaustive or limiting of the invention to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application, and to enable one of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0152] Although the embodiments disclosed in the present invention are as above, the content described is only an embodiment adopted for the convenience of understanding the present invention and is not intended to limit the present invention. Any person skilled in the art within the technical field to which the present invention pertains may make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. An online monitoring system for organic pollution in groundwater based on ORP, characterized in that, The system includes: A monitoring device, which is arranged in the target well and used to monitor the organic pollutants in the target well. Among them, according to the estimated pollutant types of the target well, different combinations of monitoring probes in the monitoring device are determined; A processing device, which is used to analyze the monitoring results of the monitoring device and determine the types of organic pollution in the groundwater of the target well.

2. The on-line monitoring system for organic pollution of groundwater based on ORP according to claim 1, characterized in that, The monitoring device includes but is not limited to: a redox potential monitoring probe, a water level monitoring probe, an oil film monitoring probe, and a nitrate monitoring probe.

3. The on-line monitoring system for organic pollution of groundwater based on ORP according to claim 2, characterized in that, The installation depths of the redox potential monitoring probe and the water level monitoring probe are at a preset position below the lowest water level line. The installation depth of the nitrate monitoring probe is below the redox potential monitoring probe and the water level monitoring probe. The installation depth of the oil film monitoring probe is at a preset position above the highest water level line.

4. An on-line monitoring system for organic pollution of groundwater based on ORP as claimed in claim 2 or 3, characterized in that, When the estimated pollutant types of the target well include benzene ring type pollution, the redox potential monitoring probe, the water level monitoring probe, and the oil film monitoring probe are used as the monitoring probe combination.

5. The on-line monitoring system for organic pollution of groundwater based on ORP according to claim 4, characterized in that, When the estimated pollutant types of the target well do not include benzene ring type pollution, the redox potential monitoring probe, the water level monitoring probe, and the nitrate monitoring probe are used as the monitoring probe combination.

6. An on-line monitoring system for organic pollution of groundwater based on ORP as claimed in any one of claims 2 to 5, characterized in that, A cylindrical drainage pipe composed of oil inlet and non-water inlet membrane is arranged above the nitrate monitoring probe, and a detection tank composed of water inlet and non-oil inlet membrane is arranged at the position where the nitrate monitoring probe is located.

7. An on-line monitoring system for organic pollution of groundwater based on ORP as described in any one of claims 2-6, characterized in that, The system also includes: an initialization device, which is used to train the monitoring probe combination and record data. Among them, the training period of the redox potential monitoring probe is not less than the first preset period, the training periods of the oil film monitoring probe and the nitrate monitoring probe are not less than the second preset period, and the training period of the water level monitoring probe is not less than the third preset period.

8. An on-line monitoring system for organic pollution of groundwater based on ORP according to any one of claims 5-7, characterized in that, The processing device includes an index setting module, which is used to set the monitoring indexes of each monitoring probe, where: The redox potential monitoring probe includes a numerical change index A1 and a numerical change index A2: A1: The value for 5 consecutive days ≥ 50% of the 5-day moving average value; A2: The value for 5 consecutive days is within ±50% of the moving average value; The water level monitoring probe includes a numerical change index B1 and a numerical change index B2: B1: The water level fluctuation for 2 consecutive days > 10 cm; B2: The water level fluctuation for 2 consecutive days ≤ 10 cm; The oil film monitoring probe includes a numerical change index C1 and a numerical change index C2, where the index C1 and index C2 are set for the non-aqueous phase liquid phase pollution containing benzene rings; The nitrate monitoring probe includes a numerical change index D1 and a numerical change index D2: D1: The value for 5 consecutive days ≥ 30% of the 5-day moving average value; D2: The value for 5 consecutive days is within ±30% of the moving average value.

9. The on-line monitoring system for organic pollution of groundwater based on ORP according to claim 8, characterized in that, The processing device includes a pollution judgment module, which determines the types of organic pollution in the groundwater of the target well based on the monitoring results of the monitoring probe combination, where: When the estimated pollutant types of the target well include benzene ring type pollution, the organic monitoring judgment of benzene ring-containing pollutants is as follows: The simultaneous establishment of A1 and B2 indicates organic pollution of benzene ring-containing pollutants; The simultaneous establishment of A1, B2, and C2 indicates that there may be a change in redox potential caused by rainfall but there is no benzene ring-containing organic pollution; The simultaneous establishment of A2 and C2 indicates the absence of organic pollution containing benzene rings; The simultaneous establishment of A1, B2, and C1 indicates the presence of non-aqueous phase liquid pollution containing benzene rings.

10. An on-line monitoring system for organic pollution in groundwater based on ORP as claimed in claim 8 or 9, characterized in that, When the predicted pollutant types in the target well do not include benzene ring pollution, the monitoring and judgment of common organic pollutants are as follows: The simultaneous establishment of A1 and B2 indicates the presence of organic pollution; The simultaneous establishment of A1, B1, and D1 indicates the possible changes in redox potential and nitrate caused by rainfall but the absence of organic pollution; The simultaneous establishment of A1, B2, and D1 indicates the possible presence of organic pollution.

11. An online monitoring method for organic pollution in groundwater based on ORP, characterized in that, Executed by the system according to any one of claims 1-10, the method includes: Monitoring the organic pollutants in the target well through the monitoring device arranged in the target well, wherein, according to the predicted pollutant types in the target well, different combinations of monitoring probes in the monitoring device are determined; Analyzing the monitoring results of the monitoring device by the processing device to determine the types of groundwater organic pollution in the target well.

12. The on-line monitoring method for organic pollution of groundwater based on ORP as claimed in claim 11, wherein The method includes: Collecting the basic data of the target well, judging whether there are benzene ring pollutants to determine the selected combination of monitoring probes; Determining the monitoring indicators of each monitoring probe and arranging the monitoring probes at different monitoring depths; When arranging the monitoring probes, modifying the nitrate monitoring probe, wrapping a cylindrical drainage pipe composed of oil entering but water not entering the membrane above, and a detection tank composed of water entering but oil not entering the membrane below; After the arrangement is completed, perform data accumulation machine training on the redox potential monitoring probe, oil film monitoring probe, and nitrate monitoring probe at different times, and directly import the water level monitoring probe according to the historical change data; After the training is completed, start online monitoring, perform coupling analysis according to the data change range of the selected monitoring indicators, judge whether there is organic pollution according to the coupling result, and issue a warning.

13. A storage medium, characterized in that, It includes a series of instructions for executing the method steps according to any one of claims 11-12.

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