Device and method for monitoring incoming water quality of oil refining and chemical engineering sewage treatment plant in real time

Abstract

The invention discloses a device and method for monitoring the quality of incoming water of an oil refining and chemical engineering sewage treatment plant in real time, and relates to the technical field of sewage treatment of oil refining enterprises, and the device is characterized in that an automatic incoming water dilution system is connected with an activated sludge tank through a connecting pipeline; the activated sludge tank blower is connected with the activated sludge tank; a probe of the oxidation-reduction potential tester is placed in the activated sludge tank; the sedimentation tank is connected with the activated sludge tank through a connecting pipeline; the sludge reflux pump is connected with the activated sludge tank through a connecting pipeline, and is connected with the sedimentation tank through a connecting pipeline; the peristaltic pump is connected with the sedimentation tank through a connecting pipeline, and a one-way valve is arranged between the peristaltic pump and the sedimentation tank; and the control system is connected with the incoming water automatic dilution system, the activated sludge tank blower, the oxidation-reduction potential tester, the sludge reflux pump and the peristaltic pump. The method can monitor the water quality condition of incoming water of a refining sewage treatment plant in real time, and rapidly and effectively judge abnormal fluctuation of the incoming water quality.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment in petrochemical enterprises, and in particular to a device and method for real-time monitoring of the water quality of inflow from a petroleum refining and chemical wastewater treatment plant. Background Art

[0002] The sewage treatment plants of petrochemical enterprises receive various types of water discharged from upstream production units, such as refinery wastewater, chemical wastewater, ethylene wastewater, and rubber wastewater. The quality of the incoming water depends on the type of crude oil processed by the upstream sewage production unit and the process conditions, and is also affected by various factors such as operation, management, equipment failure, and process changes. The control of the quality of the incoming water plays an extremely important role in the long-term stable operation of each process unit of the sewage treatment plant and the final compliance of the effluent with the discharge standards. In extreme cases, under the influence of the above factors, the quality of the incoming water of the sewage treatment plant changes dramatically, and it is necessary to adjust the process flow of the subsequent sewage treatment units in a timely manner to respond. Otherwise, the subsequent sewage treatment units will suffer continuous impacts due to the sudden deterioration of the water quality, which will eventually lead to an environmental liability accident where the effluent of the sewage treatment plant does not meet the standards.

[0003] Rapidly, intuitively and effectively realizing the accurate judgment of abnormal water quality of sewage treatment plants is a technical problem that needs to be solved urgently by sewage treatment plants of refineries and chemical enterprises at this stage. At present, the water quality analysis of sewage treatment plants mainly includes the following technologies:

[0004] Laboratory water quality pollutant content analysis is currently the most widely used technical solution for sewage treatment plant water quality analysis. During the inspection, sewage treatment plant inspection technicians observe the color and smell of the incoming water and notify the detection and analysis personnel to conduct laboratory water quality pollutant content analysis after sampling on site after finding abnormalities. Then, the process parameters of each sewage treatment unit in the subsequent process are adjusted based on the analysis data. The laboratory pollutant content analysis test results are relatively accurate, but the analysis process takes a long time, which makes the adjustment and optimization of process parameters lag behind the change of water quality.

[0005] The online monitoring system for water pollution sources is also one of the most widely used technical solutions for water quality analysis of sewage treatment plants. The online monitoring system for water pollution sources is mainly composed of a pre-treatment unit, a flow monitoring unit, an automatic water quality sampling unit, an online monitoring instrument for water pollution sources, a data control unit, and corresponding building facilities. Due to the particularity of the incoming water from the sewage treatment plant of a refinery, when analyzing the incoming water quality through an online monitoring system, it is often necessary to add a sample pre-treatment unit to remove interfering substances such as floating oil impurities. Compared with general water quality analysis instruments, the online monitoring system for water pollution sources is equipped with two major features: an automatic water quality sampling unit and a data control unit. The automatic water quality sampling unit has the functions of collecting instantaneous water samples and mixed water samples, mixing and temporarily storing water samples, automatically rinsing and emptying the mixing barrel, and retaining samples; the data control unit can coordinate and uniformly operate the online monitoring system for water pollution sources, collect, store, and display monitoring data and operation logs, and upload pollution source monitoring data to the monitoring center platform. Under the control of the data control unit, after the water quality automatic sampling unit samples the water quality, it will send the instantaneous water sample to the water quality analyzer and temperature transmitter, and send the mixed water sample to the COD (Chemical Oxygen Demand), TOC (Total Organic Carbon), NH3-N (Ammonia nitrogen content index), TP (Total Phosphorus), TN (Total Nitrogen) water quality analyzer, and then transmit the water quality monitoring data to the monitoring center platform. The data control unit can generate and display the daily, monthly and annual statistical tables of the monitoring data of the online monitoring instruments of each water pollution source, so that the relevant personnel of the sewage treatment plant operation can analyze and judge the existing facilities and equipment and process flow through statistical data, and deal with the problems in time. When the online monitoring system for water pollution sources is used to analyze the influent water quality of the refinery and chemical wastewater treatment plant, due to the poor influent water quality, the monitoring results are interfered by factors such as high pollutant concentration, high turbidity, and high chroma, which affect the data accuracy. At the same time, interfering substances such as floating oil carried in the poor water quality adhere to the online monitoring, increasing the subsequent operation and maintenance costs of the online monitoring system.

[0006] The online monitoring system for water quality biological toxicity is an emerging technical solution for water quality analysis of sewage treatment plants. The online monitoring system for water quality biological toxicity mainly includes online monitoring instruments for luminous bacteria, fish, algae, fleas, etc. Different from conventional multi-parameter and characteristic pollutants that mainly target a single indicator in the national water quality standards, online biological toxicity is a comprehensive water quality evaluation indicator that can better warn of toxic substances in water bodies and more scientifically avoid the risk of major sudden water pollution incidents.

[0007] Among the existing technical solutions for online monitoring of water quality biological toxicity, the current status of similar technologies related to the present invention is as follows:

[0008] Patent document CN102175606A discloses "a method for detecting acute biological toxicity of sewage". This method extracts and concentrates organic matter in sewage samples, eliminates interference from inorganic matter, and then uses freshwater luminous bacteria - Vibrio qinghaiensis Q67 for detection, thereby establishing a method for accurately detecting acute biological toxicity of sewage samples. The technical solution has the following technical defects: (1) The detection of acute biological toxicity of water samples with luminescent bacteria requires a relatively cumbersome pre-treatment step, mainly using a C18 solid phase extraction column to extract and concentrate the organic matter in the sample, which makes the water quality analysis process lengthy and complicated; (2) In the process of conducting biological toxicity analysis of water quality samples, in addition to the equipment required for the aforementioned pre-treatment stage, an additional luminescent bacteria detector is required, that is, the sample analysis can only be completed under the synergistic effect of multiple sets of equipment, which is not convenient for on-site promotion and application; (3) During the analysis process, expensive Qinghai Vibrio Q67 freeze-dried powder is required as the test raw material, making the application cost of the solution quite high; (4) In terms of the characteristics of refinery and chemical wastewater, the high-content, multi-component organic pollutants in refinery and chemical wastewater are further increased after extraction and concentration, which will cause the activity of the tested bacteria to be greatly reduced regardless of the fluctuation of the incoming water quality. That is, there is no good linear response relationship between the water quality fluctuation and the test result. In summary, the technical solution is not suitable for the water quality characteristics of refinery and chemical wastewater.

[0009] Patent document CN107315076A discloses "an online toxicity analysis system and its determination method and process". The technical solution includes a microbial generator, a mixing module and a respiration rate meter. The active microbial generator is used to cultivate microbial substances for measurement, which is connected to the mixing module and conveys the microbial substances for measurement to it; the mixing module is used to introduce the microbial substances for measurement from the active microbial generator and introduce sewage to form a mixed sample, which is connected to the respiration rate meter and conveys the mixed sample to it; the respiration rate meter is used to introduce the mixed sample from the mixing module and detect its toxicity. It can be applied to actual sewage treatment plants. If a poison leaks into the sewage, the sudden decrease in respiration rate will be reflected. If the respiration rate decreases rapidly, below a certain percentage, an alarm will be triggered and the corresponding action will be performed. This technical solution has the following technical defects: (1) In this technical solution, the activated sludge in the biochemical treatment unit is used as the test microorganism. Since the water quality of the biochemical treatment unit is quite different from that of the refinery wastewater treatment plant, if the activated sludge in the biochemical treatment unit has not been cultured and acclimated with the water from the refinery wastewater treatment plant, the microorganisms in the activated sludge cannot use the high-content and complex matrix components of organic pollutants in the refinery wastewater as a carbon source for normal physiological metabolism, resulting in a failure to produce a sensitive physiological response between the activity of the activated sludge and the change in the water quality of the refinery wastewater; (2) In this technical solution, the water quality is reflected by measuring the dissolved oxygen and then calculating the microbial respiration rate based on it. However, the measurement result of dissolved oxygen is affected by many uncertain factors. The influence of factors, such as water sample temperature, pH value, water disturbance, etc., and according to the description of the technical solution: "The mixing module is used to introduce the microbial substance for measurement from the active microbial generator and introduce the sewage to form a mixed sample, which is connected to the respiration rate meter and conveys the mixed sample to it, and the respiration rate meter is used to introduce the mixed sample of the mixing module and detect its toxicity", "The dissolved oxygen meter probe is used for detection close to the respiration chamber, which is connected to the dissolved oxygen analyzer for calculating the respiration rate and / or other data". It can be seen that in the process of mixing sewage and microbial substances, due to the influence of interfering factors such as water quality disturbance and uneven mixing degree, the measurement results of dissolved oxygen will fluctuate greatly, making the final test results quite different from the actual situation. Furthermore, in the comparative technical solution, "the mixing module is used to introduce the microbial substance for measurement from the active microbial generator and introduce the sewage to form a mixed sample, which is connected to the respiration rate meter and conveys the mixed sample to it, and the respiration rate meter is used to introduce the mixed sample of the mixing module and detect its toxicity", "the dissolved oxygen meter probe is used for detection close to the respiration chamber, which is connected to the dissolved oxygen analyzer for calculating the respiration rate and / or other data", that is, the respiration rate is calculated by measuring the dissolved oxygen to reflect the water quality.The measurement results of dissolved oxygen are affected by many uncertain factors, such as the temperature and pH value of water quality samples. At the same time, during the mixing process of sewage and microbial substances, the measurement results of dissolved oxygen will fluctuate greatly due to interference factors such as water quality disturbance and uneven mixing. (3) In this comparative technical solution, in the early stage of activated sludge acclimatization and commissioning, the activated sludge has not yet fully adapted to the incoming water quality. At this time, the incoming water dilution ratio is adjusted to ensure that the pollutant content in the incoming water is low to avoid impact on the activated sludge. As the adaptability of microorganisms in the activated sludge to water quality continues to increase, the incoming water dilution ratio is adjusted again to ensure that the pollutant content in the water is sufficient to provide sufficient carbon sources and other nutrients for the normal growth of microorganisms.

[0010] Timely and effective judgment of water anomalies in sewage treatment plants is an important technical problem currently faced by sewage treatment plants of petrochemical enterprises. The judgment methods in the existing background technology are either due to the long analysis process, which makes the adjustment process of process parameters lag behind the change of water quality, which is not conducive to the long-term stable compliance and low-cost operation of sewage treatment plants, or due to the high pollutant concentration, high turbidity and high chromaticity of petroleum refining and chemical wastewater itself, the instrument performance is difficult to maintain stability for a long time. Summary of the invention

[0011] The purpose of the present invention is to provide a device and method for real-time monitoring of the water quality of the inlet water of a petroleum refinery and chemical wastewater treatment plant, so as to realize rapid and effective judgment when the water quality of the inlet water of the wastewater treatment plant is abnormal. The present invention is a detection method and device for abnormal water quality of the inlet water during the actual operation of the wastewater treatment plant of a refinery and chemical enterprise. It can monitor the water quality of the inlet water of the refinery and chemical wastewater treatment plant in real time, quickly and effectively judge the abnormal fluctuation of the water quality of the inlet water, and provide technical support for the overall stable operation of the wastewater treatment plant. In order to achieve the above purpose, the present invention provides the following technical solutions:

[0012] The present invention provides a device for real-time monitoring of the water quality of an oil refinery wastewater treatment plant, the device comprising: an automatic water dilution system, an activated sludge tank, an activated sludge tank blower, an oxidation-reduction potential measuring instrument, a sedimentation tank, a sludge return pump, a one-way valve, a peristaltic pump and a control system; wherein,

[0013] The incoming water automatic dilution system is connected to the activated sludge tank via a first connecting pipeline;

[0014] The activated sludge tank blower is connected to the activated sludge tank;

[0015] The probe of the oxidation-reduction potential measuring instrument is placed in the activated sludge tank;

[0016] The sedimentation tank is connected to the activated sludge tank via a second connecting pipeline;

[0017] The sludge return pump is connected to the activated sludge tank through a third connecting pipeline, and is connected to the sedimentation tank through a fourth connecting pipeline;

[0018] The peristaltic pump is connected to the sedimentation tank through a fifth connecting pipeline, and a one-way valve is provided between the peristaltic pump and the sedimentation tank;

[0019] The control system is connected with the incoming water automatic dilution system, the activated sludge pool blower, the oxidation-reduction potential measuring instrument, the sludge return pump and the peristaltic pump.

[0020] Furthermore, the automatic water dilution system is connected to the branch line of the water pipeline of the refinery sewage treatment plant through the sixth connecting pipeline; at the same time, the peristaltic pump is connected to the branch line of the water pipeline of the refinery sewage treatment plant through the seventh connecting pipeline.

[0021] Furthermore, the automatic water dilution system is used to dilute the water from the sewage treatment plant of the refinery enterprise according to the dilution ratio set by the control system;

[0022] The activated sludge pool is used to collect activated sludge from the aerobic degradation section of the sewage treatment plant of the refinery;

[0023] The activated sludge tank blower is used to aerate the activated sludge tank;

[0024] The oxidation-reduction potential measuring instrument is used to measure the oxidation-reduction potential of the activated sludge in the activated sludge tank;

[0025] The sedimentation tank is used to receive the activated sludge discharged from the activated sludge tank;

[0026] The sludge return pump is used to return the activated sludge at the bottom of the sedimentation tank to the activated sludge tank;

[0027] The third connecting pipeline and the fourth connecting pipeline are used together with the sludge return pump to introduce the activated sludge at the bottom of the sedimentation tank into the activated sludge tank;

[0028] The fifth connecting pipeline and the peristaltic pump are used together to introduce the sewage flowing out of the sedimentation tank through the one-way valve into the branch line of the water pipeline of the sewage treatment plant;

[0029] The control system is used to control the opening and closing of the incoming water automatic dilution system, the activated sludge pool blower, the redox potential measuring instrument, the sludge return pump and the peristaltic pump, as well as the parameter setting and adjustment.

[0030] The present invention also provides a method for real-time monitoring of water quality of an oil refinery wastewater treatment plant, the method comprising the following steps:

[0031] Step S1, connecting the incoming water automatic dilution system to the branch line of the sewage treatment plant's incoming water pipeline, and the control system controls the incoming water automatic dilution system to automatically dilute the incoming water of the sewage treatment plant online according to a predetermined ratio;

[0032] Step S2, placing the activated sludge from the aerobic degradation section of the biochemical treatment system of the wastewater treatment plant of the refinery enterprise into the activated sludge tank;

[0033] Step S3, passing the diluted sewage treatment plant water into the activated sludge tank, and starting the water automatic dilution system, the activated sludge tank blower, the sludge return pump and the peristaltic pump through the control system to acclimate and cultivate the activated sludge in the activated sludge tank;

[0034] Step S4, directly connecting the activated sludge tank blower to the activated sludge tank, and controlling the opening and closing of the activated sludge tank blower and parameter setting and adjustment through a control system;

[0035] Step S5, placing the probe of the oxidation-reduction potential measuring instrument in the activated sludge tank, and controlling the opening and closing of the oxidation-reduction potential measuring instrument and the setting and adjustment of parameters through a control system;

[0036] Step S6, connecting the sedimentation tank with the activated sludge tank, and controlling the opening and closing of the activated sludge return pump and parameter setting and adjustment through the control system;

[0037] Step S7, installing a one-way valve at the outlet end of the sedimentation tank, and connecting the sewage flowing out of the sedimentation tank through the one-way valve to the branch line of the water pipeline of the sewage treatment plant through the peristaltic pump and the fifth connecting pipeline;

[0038] Step S8: determining whether the oxidation-reduction potential indicated by the oxidation-reduction potential measuring instrument is within a normal threshold range.

[0039] Furthermore, the determination of whether the oxidation-reduction potential indicated by the oxidation-reduction potential measuring instrument is within a normal threshold range includes:

[0040] When the water supply to the sewage treatment plant of the refinery is normal, the activated sludge in the activated sludge pool is in good condition, and the redox potential indicated by the redox potential measuring instrument is within the normal threshold range;

[0041] When the pollutant content in the inflow water of the sewage treatment plant of the refinery exceeds the water quality control index, the growth condition of the activated sludge in the activated sludge pool is abnormal, and the oxidation-reduction potential indicated by the oxidation-reduction potential meter exceeds the normal threshold range, thereby indicating that the inflow water of the sewage treatment plant of the refinery is abnormal.

[0042] Furthermore, in step S1, the dilution ratio is 1:1 to 1:20.

[0043] Furthermore, in step S4, the air supply volume of the activated sludge tank blower is 2L / h to 16L / h, and the relative humidity range required for normal operation is 20%RH to 90%RH.

[0044] Furthermore, in step S5, the measurement range of the oxidation-reduction potential measuring instrument is -100mV to 600mV, and the relative humidity range required for normal operation is 20%RH to 90%RH.

[0045] Furthermore, in step S6, the sludge return range of the activated sludge return pump is 0.5L to 5L.

[0046] Furthermore, in step S7, the pumping flow rate of the peristaltic pump ranges from 0.1L to 5L.

[0047] Technical effects and advantages of the present invention:

[0048] (1) The present invention overcomes the influence of matrix interference of water quality samples from oil refinery and chemical wastewater treatment plants on the final test results.

[0049] (2) The present invention realizes continuous and dynamic reaction of the water quality of the sewage treatment plant of the refinery enterprise, and can quickly and intuitively judge the abnormal water quality of the sewage treatment plant. In the actual operation process, the monitoring and analysis of multiple pollutant indicators can be completed without consuming a lot of manpower and material resources.

[0050] (3) The present invention uses the redox potential of activated sludge after domestication and cultivation to characterize the abnormality of incoming water. Compared with the single pollutant type and content information, it can comprehensively reflect the water quality characteristics of incoming water.

[0051] (4) The main structure of the device of the present invention is highly maintainable and reliable.

[0052] (5) Different from the traditional monitoring and analysis methods, the detection device and method of the present invention can quickly respond to the abnormal conditions of the incoming water quality in a short time, so that the sewage treatment plant can take corresponding treatment measures in time to deal with the abnormal conditions of the incoming water, and avoid the impact of abnormal incoming water on the various process units of the sewage treatment plant due to the lag of treatment measures.

[0053] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1This is a structural diagram of a device for real-time monitoring of the water quality of an inflowing water from a refinery and chemical wastewater treatment plant according to the present invention;

[0055] Figure 2 A flow chart of a method for real-time monitoring of water quality of an oil refinery wastewater treatment plant according to the present invention;

[0056] In the figure, 1. automatic incoming water dilution system; 2. activated sludge tank; 3. activated sludge tank blower; 4. redox potential measuring instrument; 5. sedimentation tank; 6. sludge return pump; 71. first connecting pipeline; 72. second connecting pipeline; 73. third connecting pipeline; 74. fourth connecting pipeline; 75. fifth connecting pipeline; 76. sixth connecting pipeline; 77. seventh connecting pipeline; 8. one-way valve; 9. peristaltic pump; 10. control system. DETAILED DESCRIPTION

[0057] 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.

[0058] In order to solve the deficiencies of the prior art, the present invention discloses a device for real-time monitoring of the water quality of an oil refinery and chemical wastewater treatment plant. Figure 1 The structure diagram of the device for real-time monitoring of the water quality of the oil refinery wastewater treatment plant of the present invention is as follows: Figure 1 As shown, the device comprises:

[0059] An automatic water dilution system 1, an activated sludge tank 2, an activated sludge tank blower 3, an oxidation-reduction potential meter 4, a sedimentation tank 5, a sludge return pump 6, a one-way valve 8, a peristaltic pump 9 and a control system 10. The automatic water dilution system 1 is connected to the branch line of the water pipeline of the sewage treatment plant of the refinery through the sixth connecting pipeline 76; the activated sludge tank 2 is connected to the automatic water dilution system 1 through the first connecting pipeline 71; the activated sludge tank blower 3 is directly connected to the activated sludge tank 2; the probe of the oxidation-reduction potential meter 4 is placed in the activated sludge tank 2; the sedimentation tank 5 is connected to the activated sludge tank 2 through the second connecting pipeline 72; the sludge return pump 6 is connected to the activated sludge tank 2 through the third connecting pipeline 73. ; At the same time, the sludge return pump 6 is connected to the sedimentation tank 5 through the fourth connecting pipeline 74, and the fourth connecting pipeline 74 is partially placed in the sedimentation tank 5; a one-way valve 8 is installed at the outlet end of the sedimentation tank 5, and the peristaltic pump 9 and the fifth connecting pipeline 75 connect the sewage flowing out of the sedimentation tank 5 through the one-way valve 8 to the branch line of the sewage treatment plant's inlet water pipeline through the seventh connecting pipeline 77; the control system 10 is connected to the automatic inlet water dilution system 1, the activated sludge tank blower 3, the redox potential measuring instrument 4, the sludge return pump 6 and the peristaltic pump 9.

[0060] Furthermore, the automatic water dilution system 1 is used to dilute the incoming water from the refinery sewage treatment plant according to the dilution ratio set by the control system 10; the activated sludge tank 2 is used to gather the activated sludge in the aerobic degradation section of the refinery sewage treatment plant as an experimental object for judging whether the incoming water from the refinery sewage treatment plant is abnormal; the activated sludge tank blower 3 is used to aerate the activated sludge tank 2 to ensure the dissolved oxygen content required for the normal growth of the activated sludge in the activated sludge tank 2; the redox potential measuring instrument 4 is used to measure the redox potential of the activated sludge in the activated sludge tank 2, so as to comprehensively judge whether the incoming water from the refinery sewage treatment plant is abnormal; the sedimentation tank 5 is used to receive the activated sludge The activated sludge discharged from the sludge tank 2 ensures that the activated sludge concentration in the activated sludge tank 2 is maintained within an appropriate range; the sludge return pump 6 is used to return the activated sludge at the bottom of the sedimentation tank 5 to the activated sludge tank 2; the third connecting pipeline 73 and the fourth connecting pipeline 74 cooperate with the sludge return pump 6 to introduce the activated sludge at the bottom of the sedimentation tank 5 into the activated sludge tank 2; the fifth connecting pipeline 75 cooperates with the peristaltic pump 9 to introduce the sewage flowing out of the sedimentation tank 5 through the one-way valve 8 into the branch line of the sewage treatment plant's inlet water pipeline; the control system 10 controls the opening and closing of the inlet water automatic dilution system 1, the activated sludge tank blower 3, the redox potential meter 4, the sludge return pump 6 and the peristaltic pump 9, as well as the parameter setting and adjustment.

[0061] The present invention also discloses a method for real-time monitoring of the water quality of the oil refinery sewage treatment plant. Figure 2 The flowchart of the method for real-time monitoring of water quality of a refinery wastewater treatment plant of the present invention is as follows: Figure 2 As shown, the method comprises the following steps:

[0062] Step S1, connecting the incoming water automatic dilution system 1 to the branch line of the incoming water pipeline of the sewage treatment plant, and the control system 10 controls the incoming water automatic dilution system 1 to automatically dilute the incoming water of the sewage treatment plant online according to a predetermined ratio;

[0063] Preferably, the dilution ratio is between 1:1 and 1:20.

[0064] Step S2, placing the activated sludge from the aerobic degradation section of the biochemical treatment system of the wastewater treatment plant of the refinery enterprise into the activated sludge pool 2;

[0065] Step S3, diluting the water from the sewage treatment plant of the refinery enterprise according to a predetermined ratio and then passing it into the activated sludge pool 2, while starting the water automatic dilution system 1, the activated sludge pool blower 3, the sludge return pump 6 and the peristaltic pump 9 through the control system 10 to acclimate and cultivate the activated sludge in the activated sludge pool 2 so that the activated sludge can adapt to the growth environment of the water quality of the sewage treatment plant of the refinery enterprise;

[0066] Preferably, during the acclimation and cultivation of the activated sludge in the activated sludge pool 2, the sewage treatment plant water under normal operating conditions of the refinery can be collected and introduced into the automatic water dilution system to avoid the activated sludge being poisoned and ineffective due to abnormal sewage treatment plant water during this period.

[0067] Step S4, the activated sludge tank blower 3 performs proper aeration for the activated sludge tank 2 to ensure that the activated sludge has sufficient dissolved oxygen content for normal growth and reproduction; the activated sludge tank blower 3 is turned on and off and its parameters are set and adjusted by the control system 10;

[0068] Preferably, the air supply volume of the activated sludge tank blower 3 is 2L / h to 16L / h, and the relative humidity range required for normal operation is 20%RH to 90%RH.

[0069] Step S5, placing the probe of the oxidation-reduction potential measuring instrument 4 in the activated sludge tank 2, and continuously and dynamically monitoring the oxidation-reduction potential of the activated sludge in the activated sludge tank 2 to characterize the growth status of the activated sludge, thereby reflecting whether the water in the sewage treatment plant of the refinery enterprise is abnormal, and the control system 10 controls the opening and closing of the oxidation-reduction potential meter 4 and the setting and adjustment of parameters;

[0070] Preferably, the measurement range of the oxidation-reduction potential measuring instrument 4 is -100 mV to 600 mV, and the relative humidity range required for normal operation is 20% RH to 90% RH.

[0071] Step S6, connecting the sedimentation tank 5 with the activated sludge tank 2 to receive the activated sludge discharged from the activated sludge tank 2, and returning the activated sludge at the bottom of the sedimentation tank 5 to the activated sludge tank 2 through the sludge return pump 6 and the fourth connecting pipeline 74, to ensure that the activated sludge concentration in the activated sludge tank 2 is maintained within an appropriate range; the control system 10 controls the opening and closing of the activated sludge return pump 6 and the parameter setting and adjustment;

[0072] Preferably, an uncovered box made of polymethyl methacrylate is selected as the activated sludge tank 2 and the sedimentation tank 5, and the inside of the box is marked with volume scale lines.

[0073] Preferably, the sludge return range of the activated sludge return pump 6 is between 0.5L and 5L.

[0074] Step S7, installing a one-way valve 8 at the outlet end of the sedimentation tank, connecting the sewage flowing out of the sedimentation tank 5 through the one-way valve 8 to the branch line of the water pipeline of the sewage treatment plant through the peristaltic pump 9 and the fifth connecting pipeline 75, to ensure that the water volume in the activated sludge tank 2 remains stable;

[0075] Preferably, the pumping flow rate of the peristaltic pump 9 is in the range of 0.1L to 5L.

[0076] Step S8: determining whether the oxidation-reduction potential indicated by the oxidation-reduction potential measuring instrument 4 is within a normal threshold range:

[0077] When the water supply to the sewage treatment plant of the refinery is normal, the activated sludge in the activated sludge pool 2 grows well, and the oxidation-reduction potential indicated by the oxidation-reduction potential measuring instrument 4 is within the normal threshold range;

[0078] When the pollutant content in the inlet water of the sewage treatment plant of the refinery exceeds the water quality control index, the growth condition of the activated sludge in the activated sludge pool 2 is abnormal, and the oxidation-reduction potential indicated by the oxidation-reduction potential measuring instrument 4 exceeds the normal threshold range, thereby indicating that the inlet water of the sewage treatment plant of the refinery is abnormal.

[0079] Therefore, the present application is a device for judging abnormal incoming water in a sewage treatment plant of a refinery enterprise, including an automatic incoming water dilution system 1, an activated sludge tank 2, an activated sludge tank blower 3, an oxidation-reduction potential meter 4, a sedimentation tank 5, a sludge return pump 6, a one-way valve 8, a peristaltic pump 9 and a control system 10, wherein the automatic incoming water dilution system 1 is connected to a branch line of the incoming water pipeline of the sewage treatment plant; the automatic incoming water dilution system 1 automatically dilutes the incoming water of the sewage treatment plant online according to a predetermined ratio; the activated sludge in the aerobic degradation section of the biochemical treatment system of the sewage treatment plant of the refinery enterprise is placed in the activated sludge tank 2; the incoming water of the sewage treatment plant of the refinery enterprise is diluted according to a certain ratio and used to domesticate and cultivate the activated sludge in the activated sludge tank 2; the activated sludge tank blower 3 performs appropriate aeration for the activated sludge tank 2, and the oxidation-reduction potential meter 4 continuously and dynamically monitors the redox potential of the activated sludge in the activated sludge tank 2 to indicate the activated sludge in the activated sludge tank 2. The growth status of the activated sludge and whether the inflow of the sewage treatment plant of the refinery enterprise is abnormal. The sedimentation tank 5 is connected to the activated sludge tank 2 to receive the activated sludge discharged from the activated sludge tank 2, and a one-way valve 8 is installed at the outlet end to ensure that the overall water flow direction of the device is consistent. The sludge return pump 6 is connected to the sedimentation tank 5 and the activated sludge tank 2 at the same time, and is used to return the activated sludge at the bottom of the sedimentation tank 5 to the activated sludge tank 2 to ensure that the concentration of activated sludge in the activated sludge tank 2 is maintained in an appropriate range. The peristaltic pump 9 is used to introduce the sewage flowing out of the sedimentation tank 5 through the one-way valve 8 into the branch line of the inflow pipeline of the sewage treatment plant to ensure that the overall water volume of the device is stable. The control system 10 controls the opening and closing of the inflow automatic dilution system 1, the activated sludge tank blower 3, the redox potential measuring instrument 4, the sludge return pump 6, and the peristaltic pump 9, as well as the parameter setting and adjustment, so that the judgment of the abnormal water quality of the sewage treatment plant can be realized quickly and intuitively.

[0080] Optionally, the incoming water automatic dilution system 1 in the embodiment of the present application can dilute the incoming water from the enterprise sewage treatment plant according to the dilution ratio set by the control system 10. Since the quality of the incoming water from the sewage treatment plant of the refinery enterprise is in dynamic fluctuation, when the content of pollutants and related toxic substances exceeds the range that the activated sludge can bear, it will cause the activated sludge to die and fail. In the actual application process, according to the quality of the incoming water from the sewage treatment plant of the refinery enterprise on that day, the automatic dilution ratio set in the control system 10 is adjusted. By diluting the incoming water, it can be ensured that the pollutants and related toxic substances in the incoming water will not seriously impact the activated sludge in the subsequent activated sludge pool 2, avoiding sludge failure, thereby ensuring that the device in the present invention can operate stably for a long time.

[0081] Optionally, the activated sludge tank 2 in the embodiment of the present application is used as an experimental object to judge whether the water from the sewage treatment plant of the refinery is abnormal. A large amount of activated sludge from the aerobic degradation section of the biochemical treatment system of the sewage treatment plant of the refinery is gathered in the activated sludge tank 2. The activated sludge tank 2 is the core process unit of the sewage treatment system. It realizes the degradation and treatment of pollutants through the decomposition of microorganisms, and the organic matter in the sewage also provides a carbon source for the growth and reproduction of the activated sludge. Based on this, the growth state of the activated sludge is related to the content of pollutants in the sewage. The water quality of the sewage can be characterized by the relevant growth state indicators of the activated sludge in the activated sludge tank 2.

[0082] Optionally, the activated sludge tank blower 3 in the embodiment of the present application is a variable frequency blower, which continuously and automatically aerates the activated sludge tank 2 to ensure the dissolved oxygen content required for the normal growth of the activated sludge in the activated sludge tank 2.

[0083] Optionally, the redox potential meter 4 in the present invention is an automatic continuous online monitoring device, and its monitoring probe is placed in the activated sludge tank 2. The redox potential value of the activated sludge tank 2 is continuously and dynamically monitored according to the concentration of organic pollutants in the activated sludge tank 2, and then it is determined whether the water inlet of the sewage treatment plant of the refinery is abnormal.

[0084] Optionally, the sedimentation tank 5 in the present invention is connected to the activated sludge tank 2, and is used to receive the activated sludge discharged from the activated sludge tank 2. During the operation of the device of the present invention, the activated sludge in the activated sludge tank 2 will be continuously lost with the disturbance of the water flow, so that the amount of activated sludge in the activated sludge tank 2 is continuously reduced, causing the device to fail. The sedimentation tank 5 can collect the activated sludge flowing out of the activated sludge tank 2 for reuse.

[0085] Optionally, the sludge return pump 6 in the present invention returns the activated sludge collected in the sedimentation tank 5 to the activated sludge tank 2 through the synergistic effect of the third connecting pipeline 73 and the fourth connecting pipeline 74, ensuring that the activated sludge concentration in the activated sludge tank 2 is maintained within an appropriate range.

[0086] Optionally, the one-way valve 8 in the present invention is installed at the outlet end of the sedimentation tank 5 to ensure that the sewage in the sedimentation tank 5 can only flow out of the sedimentation tank 5, and the sewage from the branch line of the sewage treatment plant's water pipeline cannot flow into the sedimentation tank 5, thereby preventing the sewage from the branch line of the sewage treatment plant's water pipeline from interfering with the normal operation of the sedimentation tank 5, thereby making the overall water flow direction of the device in the present invention consistent.

[0087] Optionally, the peristaltic pump 9 in the present invention is installed between the one-way valve and the branch line of the water pipeline of the sewage treatment plant, and is used to introduce the sewage in the sedimentation tank 5 into the branch line of the water pipeline of the sewage treatment plant to ensure the overall water volume of the device is stable.

[0088] Optionally, the control system 10 in the present invention controls the opening and closing of the automatic water dilution system 1, the activated sludge tank blower 3, the redox potential meter 4, the sludge return pump 6, and the peristaltic pump 9, as well as the parameter setting and adjustment to ensure the overall smooth operation of the device.

[0089] Example:

[0090] An exemplary embodiment of the present invention discloses a method for real-time monitoring of water quality of a refinery wastewater treatment plant, the method comprising the following steps:

[0091] Step S1, connecting the automatic water dilution system to the branch line of the sewage treatment plant's water pipeline, and the control system starts the automatic water dilution system to ensure that the automatic water dilution system can dilute the sewage treatment plant's water in a ratio of 1:1 to 1:20.

[0092] Step S2, taking an appropriate amount of activated sludge from the aerobic degradation section of the biochemical treatment system of the sewage treatment plant of the refinery enterprise, and placing it in the activated sludge pool.

[0093] Step S3, passing the diluted sewage treatment plant water into the activated sludge tank, and at the same time starting the automatic water dilution system, the activated sludge tank blower, the sludge return pump and the peristaltic pump through the control system to domesticate and cultivate the activated sludge in the activated sludge tank so that the activated sludge can adapt to the growth environment of the water quality of the sewage treatment plant of the refinery enterprise.

[0094] Step S4, turning on the activated sludge pool blower through the control system, setting the air supply volume of the activated sludge pool blower to 2L / h-16L / h, and the relative humidity range required for normal operation to be 20%RH-90%RH.

[0095] Step S5, placing the probe of the oxidation-reduction potential meter in the activated sludge tank, and turning on the oxidation-reduction potential meter through the control system, the measuring range of the oxidation-reduction potential meter is -100mV to 600mV, and the relative humidity range required for normal operation is 20%RH to 90%RH.

[0096] Step S6, after all the processes in steps S1 to S4 have been running stably for 0.5h, the sludge return pump is turned on by the control system, and the sludge return range of the activated sludge return pump is set to 0.5L to 5L, and the activated sludge in the sedimentation tank is returned to the activated sludge tank. The sludge return pump automatically stops after running for 10min and starts running again after 0.5h, and the cycle is repeated.

[0097] Optionally, in step S6, the time interval between automatic start and automatic stop of the sludge return pump may be adjusted according to the actual operation of the device.

[0098] Step S7, when the activated sludge pump in step S6 stops running for 3 minutes, the peristaltic pump is started through the control system, and the pumping flow rate of the peristaltic pump is set to 0.1L~5L, and the sewage in the sedimentation tank is introduced into the branch line of the sewage treatment plant water pipeline to ensure the overall water volume of the device is stable, and it stops automatically after 15 minutes.

[0099] Optionally, in step S7, the time interval between automatic start and automatic stop of the peristaltic pump may be adjusted according to the actual operation of the device.

[0100] Step S8: After all the processes in steps S1 to S7 have been running stably for 24 hours, the redox potential value of the refining enterprise under normal working conditions, that is, the normal water supply of the sewage treatment plant, is continuously read, and the redox potential value threshold range of the activated sludge tank under normal working conditions is determined accordingly. Among them, the redox potential value during the operation of the sludge return pump can be ignored. Finally, if the read redox potential value exceeds the threshold range in step S8, it indicates that the water supply of the sewage treatment plant is abnormal at this time, indicating that the pollutant content in the water supply exceeds the water quality control value.

[0101] This application realizes the cultivation and domestication of activated sludge in an activated sludge pool by turning on the automatic dilution system of incoming water, the blower of the activated sludge pool, the sludge return pump and the peristaltic pump through the control system. During the cultivation and domestication process, attention should be paid to observing the state of the activated sludge. When abnormal conditions such as sludge swelling, deterioration, and stench occur, the activated sludge should be replaced in time. After the activated sludge is successfully domesticated, the redox potential meter is turned on by the control system to continuously read the redox potential value under normal operating conditions of the refinery, that is, the normal operating conditions of the incoming water of the sewage treatment plant, and the redox potential value threshold range of the activated sludge pool under normal operating conditions is determined accordingly. Among them, the redox potential value during the operation of the sludge return pump can be ignored. During the operation of the device, when the redox potential value exceeds the normal threshold range, it indicates that the pollutant content in the incoming water exceeds the water quality control value.

[0102] By using the detection device and method for abnormal incoming water of the sewage treatment plant of a refinery enterprise provided in the embodiment of the present application, it is possible to quickly and intuitively determine the abnormal water quality of the incoming water of the sewage treatment plant. In the actual operation process, there is no need to consume a lot of manpower and material resources to complete the monitoring and analysis of multiple pollutant indicators. Different from the traditional monitoring and analysis method, the detection device and method in the present invention can quickly respond to the abnormal situation of the incoming water quality in a short time, so that the sewage treatment plant can take corresponding treatment measures in time to deal with the abnormal incoming water situation, avoid the impact of abnormal incoming water on various process units of the sewage treatment plant due to the lag of treatment measures, and can effectively save the operating cost of the sewage treatment plant without treatment, and has the advantages of simple operation and significant cost control effect.

[0103] In summary, the device and method of the present invention have the following advantages:

[0104] (1) The sample pretreatment process of the present invention is relatively simple, and there is no need to extract and concentrate the sample by means of C18 solid phase extraction cartridges, thereby simplifying the water quality analysis process;

[0105] (2) The related devices and methods involved can independently complete the monitoring of the water quality of refinery and chemical wastewater without the need for a luminescent bacteria detector, which is more conducive to on-site application and promotion;

[0106] (3) Different from using expensive Vibrio qinghaiensis Q67 as the test organism, the present invention uses activated sludge from a biochemical treatment unit as the test organism, which greatly reduces the production and application costs;

[0107] (4) Since the organic matter content in the refinery wastewater is relatively high, the organic matter content in the wastewater sample is further increased after extraction and concentration. No matter how the water quality fluctuates, the activity of the tested bacteria will be greatly reduced, that is, there is no good linear response relationship between the water quality fluctuation and the test result. The activated sludge in the present invention is taken from the biochemical treatment unit of the sewage treatment plant, and is cultivated and domesticated with the water from the refinery wastewater treatment plant for the judgment and monitoring of water anomalies. At this time, the composition of the dominant strains in the activated sludge has changed significantly compared with the microbial colony structure of the activated sludge in the original biochemical treatment unit. The activated sludge domesticated with the water from the refinery wastewater treatment plant is more sensitive to the physiological response of the refinery wastewater, and can better adapt to the characteristics of the refinery wastewater with high organic matter content and complex matrix components;

[0108] (5) In the present invention, the redox potential is used to characterize the degree to which the activated sludge is affected by the water quality. The redox potential is the difference between the redox potential of the indicator electrode and the redox potential of the comparison electrode in the activated sludge tank. It is a comprehensive indicator that can indicate the redox state of the entire system. There are a variety of variable ions and dissolved oxygen in the refinery wastewater, that is, a plurality of redox pairs. The important redox reactions in the sewage treatment system include the biodegradation of organic pollutants such as carbon, nitrogen, and phosphorus, the hydrolysis and acidification of organic matter, and nitrification and denitrification reactions. The higher the redox potential, the lower the concentration of organic pollutants in the wastewater treatment system, and the stronger the oxidizing property; the lower the redox potential, the higher the content of reducing substances or organic pollutants in the wastewater treatment system, and the stronger the reducing property. The redox potential (ORP), as a variable to measure the redox capacity, is greatly affected by the water quality in sewage treatment. There are also great differences in the influent water quality of different sewage treatment plants. Therefore, each sewage treatment plant has its own specific ORP at a specific stage of the biological reaction process of the sewage treatment process. Therefore, compared with other characterization indicators, redox potential is more sensitive to changes in sewage quality and its characterization is more comprehensive.

[0109] (6) The water quality monitoring device of the present invention includes a water dilution system. In the early stage of activated sludge acclimation and cultivation and commissioning, the activated sludge has not yet fully adapted to the water quality of the incoming water. At this time, the incoming water dilution ratio is adjusted to ensure that the pollutant content in the incoming water is low to avoid impact on the activated sludge. As the adaptability of the microorganisms in the activated sludge to the water quality continues to increase, the incoming water dilution ratio is adjusted again to ensure that the pollutant content in the water is sufficient to provide sufficient carbon sources and other nutrients for the normal growth of the microorganisms. The incoming water dilution system ensures that the device of the present invention runs more smoothly to achieve the expected effect.

[0110] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for real-time monitoring of water quality of a refinery wastewater treatment plant, characterized in that: The device comprises: an automatic water dilution system (1), an activated sludge tank (2), an activated sludge tank blower (3), an oxidation-reduction potential measuring instrument (4), a sedimentation tank (5), a sludge return pump (6), a one-way valve (8), a peristaltic pump (9) and a control system (10); wherein: The automatic water dilution system (1) is connected to the activated sludge tank (2) via a first connecting pipeline (71); The activated sludge tank blower (3) is connected to the activated sludge tank (2); The probe of the oxidation-reduction potential measuring instrument (4) is placed in the activated sludge tank (2); The sedimentation tank (5) is connected to the activated sludge tank (2) via a second connecting pipeline (72); The sludge return pump (6) is connected to the activated sludge tank (2) via a third connecting pipeline (73), and is connected to the sedimentation tank (5) via a fourth connecting pipeline (74); The peristaltic pump (9) is connected to the sedimentation tank (5) via a fifth connecting pipeline (75), and a one-way valve (8) is provided between the peristaltic pump (9) and the sedimentation tank (5); The control system (10) is connected to the automatic water dilution system (1), the activated sludge pool blower (3), the oxidation-reduction potential measuring instrument (4), the sludge return pump (6) and the peristaltic pump (9).

2. A device for real-time monitoring of water quality of a refinery wastewater treatment plant according to claim 1, characterized in that: The automatic water dilution system (1) is connected to a branch line of the water supply pipeline of the sewage treatment plant of the refinery through a sixth connecting pipeline (76); at the same time, the peristaltic pump (9) is connected to a branch line of the water supply pipeline of the sewage treatment plant of the refinery through a seventh connecting pipeline (77).

3. A device for real-time monitoring of water quality of a refinery wastewater treatment plant according to claim 1 or 2, characterized in that: The automatic water dilution system (1) is used to dilute the water from the sewage treatment plant of a refinery enterprise according to the dilution ratio set by the control system (10); The activated sludge pool (2) is used to collect activated sludge from the aerobic degradation section of the sewage treatment plant of the refinery; The activated sludge tank blower (3) is used to aerate the activated sludge tank (2); The oxidation-reduction potential measuring instrument (4) is used to measure the oxidation-reduction potential of the activated sludge in the activated sludge tank (2); The sedimentation tank (5) is used to receive the activated sludge discharged from the activated sludge tank (2); The sludge return pump (6) is used to return the activated sludge at the bottom of the sedimentation tank (5) to the activated sludge tank (2); The third connecting pipeline (73) and the fourth connecting pipeline (74) are used together with the sludge return pump (6) to introduce the activated sludge at the bottom of the sedimentation tank (5) into the activated sludge tank (2); The fifth connecting pipeline (75) and the peristaltic pump (9) are used together to introduce the sewage flowing out of the sedimentation tank (5) through the one-way valve (8) into the branch line of the water pipeline of the sewage treatment plant; The control system (10) is used to control the opening and closing of the incoming water automatic dilution system (1), the activated sludge tank blower (3), the oxidation-reduction potential measuring instrument (4), the sludge return pump (6) and the peristaltic pump (9), as well as the parameter setting and adjustment.

4. A method for real-time monitoring of the water quality of a refinery wastewater treatment plant, the method using the device according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: Step S1, connecting the incoming water automatic dilution system (1) to the branch line of the incoming water pipeline of the sewage treatment plant, and the control system (10) controls the incoming water automatic dilution system (1) to automatically dilute the incoming water of the sewage treatment plant online according to a predetermined ratio; Step S2, placing the activated sludge from the aerobic degradation section of the biochemical treatment system of the wastewater treatment plant of the refinery enterprise into the activated sludge tank (2); Step S3, passing the diluted sewage treatment plant water into the activated sludge tank (2), and starting the water automatic dilution system (1), the activated sludge tank blower (3), the sludge return pump (6) and the peristaltic pump (9) through the control system (10) to acclimate and cultivate the activated sludge in the activated sludge tank (2); Step S4, directly connecting the activated sludge tank blower (3) to the activated sludge tank (2), and controlling the opening and closing of the activated sludge tank blower (3) and parameter setting and adjustment through a control system (10); Step S5, placing the probe of the oxidation-reduction potential measuring instrument (4) in the activated sludge tank (2), and controlling the opening and closing of the oxidation-reduction potential measuring instrument (4) and parameter setting and adjustment through the control system (10); Step S6, connecting the sedimentation tank (5) to the activated sludge tank (2), and controlling the opening and closing of the activated sludge return pump (6) and parameter setting and adjustment through the control system (10); Step S7, installing a one-way valve (8) at the outlet end of the sedimentation tank, and connecting the sewage flowing out of the sedimentation tank (5) through the one-way valve (8) to the branch line of the water pipeline of the sewage treatment plant through the peristaltic pump (9) and the fifth connecting pipeline (75); Step S8, determining whether the oxidation-reduction potential indicated by the oxidation-reduction potential measuring instrument (4) is within a normal threshold range.

5. A method for real-time monitoring of water quality of a refinery wastewater treatment plant according to claim 4, characterized in that: The determining whether the oxidation-reduction potential indicated by the oxidation-reduction potential measuring instrument (4) is within a normal threshold range comprises: When the water supply to the sewage treatment plant of the refinery is normal, the activated sludge in the activated sludge tank (2) is in good condition, and the redox potential indicated by the redox potential measuring instrument (4) is within the normal threshold range; When the pollutant content in the inflow water of the sewage treatment plant of the refinery exceeds the inflow water quality control index, the growth condition of the activated sludge in the activated sludge tank (2) is abnormal, and the oxidation-reduction potential indicated by the oxidation-reduction potential measuring instrument (4) exceeds the normal threshold range, thereby indicating that the inflow water of the sewage treatment plant of the refinery is abnormal.

6. A method for real-time monitoring of water quality of a refinery wastewater treatment plant according to claim 4 or 5, characterized in that: In the step S1, the dilution ratio is 1:1 to 1:

20.

7. A method for real-time monitoring of water quality of a refinery wastewater treatment plant according to claim 4 or 5, characterized in that: In the step S4, the air supply volume of the activated sludge tank blower (3) is 2L / h to 16L / h, and the relative humidity required for normal operation is in the range of 20%RH to 90%RH.

8. A method for real-time monitoring of water quality of a refinery wastewater treatment plant according to claim 4 or 5, characterized in that: In the step S5, the measurement range of the oxidation-reduction potential measuring instrument (4) is -100mV to 600mV, and the relative humidity range required for normal operation is 20%RH to 90%RH.

9. A method for real-time monitoring of water quality of a refinery wastewater treatment plant according to claim 4 or 5, characterized in that: In step S6, the sludge return range of the activated sludge return pump (6) is 0.5L to 5L.

10. A method for real-time monitoring of water quality of a refinery wastewater treatment plant according to claim 4 or 5, characterized in that: In step S7, the pumping flow rate of the peristaltic pump (9) ranges from 0.1L to 5L.

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