Device and method for online monitoring of effluent oxidant of coagulation clarification tank

Abstract

The invention discloses a device and method for online monitoring of an oxidizing agent in effluent of a coagulation clarifier, the device comprises a sample detection pool and an electrochemical workstation, a working electrode and an auxiliary electrode are arranged in the sample detection pool, and the working electrode and the auxiliary electrode are connected with the electrochemical workstation; and the electrochemical workstation is connected with an information collection and control center through a signal amplifier. According to the method, oxidizing substances such as ferrate in the water produced by the coagulation clarification device are sampled and monitored by adopting an electrochemical method, when ferrate exists in the water, an oxidation-reduction reaction can occur on the surface of an electrode to generate potential change, and the generated electrode potential corresponds to the concentration of the ferrate in the solution, so that the concentration of the ferrate in the solution can be detected. And the concentration of the ferrate is determined by measuring the electrode potential, so that the online monitoring of the ferrate in the effluent is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and particularly relates to a device and method for on-line monitoring of oxidants in the effluent of a coagulation clarifier. Background Art

[0002] Ferrate is a green multi-functional water treatment agent with strong oxidizing property, which can be used as an oxidant, disinfectant, coagulant, etc. It has good removal effects on organic matters, suspended solids, etc. in water, and the dosage of the agent is relatively low. After coagulation and clarification treatment with ferrate, under the condition of ensuring that the effluent quality meets the standard, it is also necessary to further on-line monitor the ferrate oxidant in the effluent to avoid strong oxidizing substances such as ferrate entering subsequent treatment devices such as membrane systems with the effluent, which will cause oxidation of membrane filaments, etc., thus having an irreversible impact on the system and seriously affecting the stability of system operation.

[0003] At present, the determination of ferrate mainly adopts redox titration method and spectrophotometry. The redox titration method is based on redox reaction, using an oxidant or reductant as a titrant to directly titrate a substance with reducibility or oxidizing property, or indirectly titrate a substance that can react with an oxidant or reductant, and judging the titration end point through an indicator or potential change, so as to determine the content of the substance to be measured. The principle of spectrophotometry is based on the absorption characteristics of substances for light with a specific wavelength, and the concentration of substances in the solution is determined by measuring the absorbance.

[0004] The redox titration method has high accuracy, but it has large consumption of reagents, relatively complex operation and low sensitivity. The spectrophotometry is to measure the absorbance of a ferrate solution at 525 nm or other larger absorption wavelengths. The operation is relatively simple and can be used to analyze ferrate at a lower concentration. However, both of these two methods are not applicable to the on-line monitoring process of ferrate. Summary of the Invention

[0005] Based on the deficiencies of the prior art, the present invention provides a device and method for on-line monitoring of oxidants in the effluent of a coagulation clarifier. This method uses electrochemistry to sample and monitor oxidizing substances such as ferrate in the produced water of the coagulation clarification device. When there is ferrate in the effluent, a redox reaction will occur on the electrode surface, resulting in a potential change. The generated electrode potential has a corresponding relationship with the concentration of ferrate in the solution. By measuring the electrode potential, the concentration of ferrate is determined, so as to realize the on-line monitoring of ferrate in the effluent.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A device for on-line monitoring of oxidants in the effluent of a coagulation clarifier, comprising a sample detection cell and an electrochemical workstation. A working electrode and a counter electrode are arranged in the sample detection cell. The working electrode and the counter electrode are connected to the electrochemical workstation, and the electrochemical workstation is connected to an information collection and control center through a signal amplifier.

[0008] A further improvement of the present invention is that a sampling inlet and a sampling outlet are arranged on the sample detection cell, and the sampling inlet and the sampling outlet are communicated with the outlet pipe of the coagulation clarifier.

[0009] A further improvement of the present invention is that a first sampling valve is arranged between the sampling inlet and the outlet pipe of the coagulation clarifier, and a second sampling valve is arranged between the sampling outlet and the outlet pipe of the coagulation clarifier. The first sampling valve and the second sampling valve are one-way valves.

[0010] A further improvement of the present invention is that filter cartridges are arranged at the sampling inlet and the sampling outlet.

[0011] A further improvement of the present invention is that the slit width of the filter cartridge is 1-3 mm.

[0012] A further improvement of the present invention is that the working electrode uses a platinum electrode, and the plate area of the platinum electrode is 0.1-0.5 cm 2 ; the counter electrode uses a graphite electrode; the working electrode and the counter electrode are located at the central position of the sample detection cell.

[0013] A further improvement of the present invention is that a current amplifier is arranged between the working electrode and the electrochemical workstation, and the current gain of the current amplifier is 10 8 ~10 10 times.

[0014] A further improvement of the present invention is that the scanning range of the electrochemical workstation is 0.6-1.0 V, and the scanning rate is 10-100 mV / s.

[0015] A method for on-line monitoring of oxidants in the effluent of a coagulation clarifier, comprising the following steps:

[0016] The effluent from the outlet pipe of the coagulation clarifier enters the on-line monitoring device through the first sampling valve. When the water sample contains ferrate, a redox reaction occurs on the surface of the working electrode in the sample detection cell, and current is generated on the surface of the working electrode. The current is transmitted to the electrochemical workstation after passing through the current amplifier, and then amplified by the signal amplifier and transmitted to the signal collection and control center to obtain the ferrate content.

[0017] A further improvement of the present invention is that the ferrate concentration is calculated by the following formula:

[0018]

[0019] Wherein, C is the concentration of ferrate;

[0020] V is the scanning speed;

[0021] Ip is the peak current output by the electrochemical workstation.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The present invention uses an electrochemical method to rapidly analyze and determine the concentration of ferrate. Ferrate in water has strong oxidizing properties and will undergo redox reactions on the surface of the working electrode, thereby generating a microcurrent. The microcurrent is transmitted to the electrochemical workstation, and the current signal received by the electrochemical workstation is again transmitted to the information collection and control center through a signal amplifier for numerical display, so that the content of ferrate in water can be obtained. It can realize the on-line analysis of ferrate in the effluent, with accurate measurement results, and does not require the consumption of a large amount of chemical reagents, which is simple and convenient. At the same time, a detachable electrode is used to improve the operability of electrode maintenance and replacement. The present invention can realize the on-line monitoring of ferrate in the coagulation and clarification effluent. When the concentration of ferrate exceeds the set value, the program automatically controls the reduction of the ferrate dosage to avoid the entry of oxidizing substances such as ferrate in the effluent into the subsequent membrane system, causing oxidation of the membrane filaments, etc., and having an irreversible impact on the system operation. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the oxidant on-line monitoring device;

[0025] Figure 2 is a schematic diagram of the principle of the measurement module;

[0026] Figure 3 is the calibration curve of the oxidant on-line monitoring device;

[0027] In the figure, 1 is the effluent pipe of the coagulation and clarification tank, 2 is the first sampling valve, 3 is the sample detection tank, 4 is the working electrode, 5 is the auxiliary electrode, 6 is the second sampling valve, 7 is the filter cartridge, 8 is the current amplifier, 9 is the electrochemical workstation, 10 is the signal amplifier, and 11 is the information collection and control center.

[0028] Specific implementation effects

[0029] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It 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 thus should not be construed as a limitation to the present invention.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, terms such as "install", "connect", "join", "fix", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. 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.

[0033] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0034] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. It should also be understood that the terms used in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly dictates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0035] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0036] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art can additionally design regions / layers with different shapes, sizes and relative positions according to actual requirements.

[0037] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0038] Refer to Figure 1 , an on-line monitoring device for oxidants in the effluent of a coagulation clarifier, mainly comprising an effluent pipe 1 of the coagulation clarifier, a first sampling valve 2, a sample detection cell 3, a working electrode 4, a counter electrode 5, a second sampling valve 6, a filter cartridge 7, a current amplifier 8, an electrochemical workstation 9, a signal amplifier 10, an information collection and control center 11.

[0039] Among them, the device for on-line monitoring of oxidants is arranged on a bypass of the effluent pipe 1 of the coagulation clarifier. Both ends of the sample detection cell 3 are connected to the effluent pipe 1 of the coagulation clarifier through the first sampling valve 2 and the second sampling valve 6 and their pipelines. The first sampling valve 2 and the second sampling valve 6 adopt a one-way valve structure, and the water sample after sampling and detection returns to the effluent pipe 1 of the coagulation clarifier through the second sampling valve 6.

[0040] The working electrode 4 and the counter electrode 5 are arranged in the sample detection cell 3. The working electrode 4 is connected to the WE interface of the electrochemical workstation 9 through the current amplifier 8; the counter electrode 5 is connected to the CE interface of the electrochemical workstation 9; the electrochemical workstation 9 is connected to the information collection and control center 11 through the signal amplifier 10.

[0041] Preferably, the working electrode 4 and the auxiliary electrode 5 are located at the central position of the sample detection cell 3. The water production valve and the unqualified water production valve are respectively arranged on the water production discharge pipe and the unqualified water production return pipe at the rear side of the water outlet pipe of the coagulation and clarification tank 3.

[0042] Filter cartridges 7 are arranged at both the sample inlet and the sample outlet of the sample detection cell 3. The slit width of the filter cartridge 7 is 1-3 mm, which plays a buffering role in the water flow at the inlet and outlet, and can intercept the suspended matter in the influent water to avoid interference with the probe detection.

[0043] The working electrode 4 is a platinum electrode modified with nanomaterials, and the plate area of the platinum electrode is 0.1-0.5 cm 2 .

[0044] Method for preparing a platinum electrode modified with nanomaterials by electrochemical-assisted self-assembly method: Place the platinum electrode successively in an ethanol solution with a mass concentration of 70% and deionized water, and use ultrasonic cleaning to remove surface impurities. Immerse the cleaned platinum electrode in an ethanol solution containing 20 mmol / L trimethylsilane for 1 hour to form trimethylsilane-grafted platinum, and then grow a silica nanochannel film layer on the surface of the trimethylsilane-grafted platinum by the electrochemical-assisted self-assembly method. Wash the electrode with an ethanol solution with a mass concentration of 70% to remove the unbound nanomaterials. Place the washed electrode in a muffle furnace, under nitrogen protection, anneal at 400 °C - 600 °C for 1-3 hours and then cool to obtain the platinum electrode modified with nanomaterials.

[0045] The auxiliary electrode 5 is a graphite electrode, which has better stability for long-term testing. The plate area of the graphite electrode is 2-6 cm 2 .

[0046] The working electrode 4 and the auxiliary electrode 5 are fixed on the sample detection cell 3 through gaskets, O-ring seals and nuts, which is convenient for the disassembly and maintenance of the electrodes.

[0047] On one side of the working electrode 4 connected to the electrochemical workstation 9, a current amplifier 8 is provided, which can collect and amplify the weak current signal output from the working electrode 4 in the first time. The current gain of the current amplifier 8 is 10 8 -10 10 times.

[0048] The scanning range of the electrochemical workstation 9 is 0.6-1.0 V, and the scanning rate is 10-100 mV / s.

[0049] The signal amplifier 10 can enhance the intensity and power of the signals collected by the electrochemical workstation 9, better resist interference during long-distance signal transmission, reduce information attenuation, and ensure that the signals can be stably and accurately transmitted to the information collection and control center 11.

[0050] The information collection and control center 11 can calculate the concentration of ferrate in water based on the received electrochemical signals. When the calculated concentration of ferrate is higher than the set value, the produced water is returned to the inlet side of the coagulation and clarification tank 3.

[0051] The online monitoring method for the oxidant in the effluent of the coagulation and clarification tank of the present invention includes the following steps:

[0052] The water flowing out from the outlet pipe 1 of the coagulation and clarification tank enters the online monitoring device through the first sampling valve 2. When there is a certain amount of ferrate in the water sample, a redox reaction occurs on the surface of the working electrode 4 in the sample detection cell as follows:

[0053]

[0054] The reaction on the surface of the working electrode 4 will generate a current. Since the concentration of ferrate in the water sample is relatively low, it can be connected to the electrochemical workstation 9 after passing through the current amplifier 8, and then further amplified by the signal amplifier 10 and transmitted to the signal collection and control center 11 to obtain the content of ferrate. When the concentration of ferrate in the effluent exceeds the set value, the program automatically controls to reduce the dosage of ferrate. By adjusting and reducing the dosage of ferrate, damage to the subsequent membrane system can be avoided.

[0055] Specifically, the concentration of ferrate can be calculated by the following formula. When the scanning speed is constant, the concentration of ferrate is proportional to the peak current:

[0056]

[0057] Among them, C - the concentration of ferrate;

[0058] V - the scanning speed;

[0059] Ip - the peak current output by the electrochemical workstation.

[0060] See Figure 2 , the principle of the online monitoring device for the oxidant in the effluent of the coagulation and clarification tank is as follows: The ferrate in the water has strong oxidizing properties and will undergo a redox reaction on the surface of the working electrode 4, thereby generating a microcurrent. The microcurrent is transmitted to the electrochemical workstation 9 after the action of the current amplifier 8. The current signal measured by the electrochemical workstation 9 is transmitted to the information collection and control center 11 again through the signal amplifier 10 for numerical display, and then the content of ferrate can be obtained.

[0061] The on-line monitoring device for the content of oxidant is calibrated by preparing a series of ferricate solutions with concentration gradients, and the relationship between the ferricate concentration and the output current signal intensity is obtained, so as to realize the conversion between the measurement signal and the ferricate concentration.

[0062] Referring to Figure 3 the calibration curve shown, with a scanning rate of 100 mV / s, the calculation formula for the ferricate concentration is obtained by fitting, as follows:

[0063] C = 0.058I P

[0064] where, C—the ferricate concentration;

[0065] Ip—the peak current output by the electrochemical workstation.

[0066] According to the calculated ferricate concentration, when the ferricate concentration exceeds the set value of 0.1 mg / L, the control center will feedback and adjust the ferricate dosing amount.

[0067] Example 1

[0068] A seawater desalination pretreatment unit adopts the ferricate coagulation sedimentation method. The turbidity of the raw seawater is 3 - 12 NTU, and the suspended solid content is 10 - 50 mg / L. The ferricate composite coagulant is used as the pretreatment coagulant, and the dosing amount of the ferricate composite coagulant is 2.5 mg / L. An on-line monitoring device for oxidant is installed on the outlet pipe of the coagulation sedimentation tank.

[0069] After the coagulation sedimentation tank operates stably, the on-line monitoring device for oxidant monitors the ferricate concentration in the effluent of the coagulation sedimentation tank. The results show that it is lower than the set value of 0.1 mg / L, indicating that the ferricate concentration in the produced water is low and the produced water meets the inlet water requirements of the subsequent system.

[0070] Example 2

[0071] A seawater desalination pretreatment unit adopts the ferricate coagulation sedimentation method. The turbidity of the raw seawater is 3 - 12 NTU, and the suspended solid content is 10 - 50 mg / L. The ferricate composite coagulant is used as the pretreatment coagulant, and the dosing amount of the ferricate composite coagulant is 3 mg / L. An on-line monitoring device for oxidant is installed on the outlet pipe of the coagulation sedimentation tank.

[0072] After the coagulation sedimentation tank operates stably, the on-line monitoring device for oxidant monitors the ferricate concentration in the effluent of the coagulation sedimentation tank. The results show that it is lower than the set value of 0.1 mg / L, indicating that the ferricate concentration in the produced water is low and the produced water meets the inlet water requirements of the subsequent system.

[0073] Example 3

[0074] A seawater desalination pretreatment unit adopts the ferrate coagulation sedimentation method. The turbidity of the raw seawater is 3 - 12 NTU, and the suspended solid content is 10 - 50 mg / L. A ferrate composite coagulant is used as the pretreatment coagulant, and the dosage of the ferrate composite coagulant is 2 mg / L. An on-line oxidant monitoring device is installed on the outlet pipe of the coagulation sedimentation tank.

[0075] After the coagulation sedimentation tank operates stably, the on-line oxidant monitoring device monitors the ferrate concentration in the effluent of the coagulation sedimentation tank. The results show that they are all lower than the set value of 0.1 mg / L, indicating that the ferrate concentration in the produced water is relatively low and the produced water meets the inlet water requirements of the subsequent system.

[0076] Example 4

[0077] A seawater desalination pretreatment unit adopts the ferrate coagulation sedimentation method. The turbidity of the raw seawater is 3 - 12 NTU, and the suspended solid content is 10 - 50 mg / L. A ferrate composite coagulant is used as the pretreatment coagulant, and the dosage of the ferrate composite coagulant is 3.5 mg / L. An on-line oxidant monitoring device is installed on the outlet pipe of the coagulation sedimentation tank.

[0078] After the coagulation sedimentation tank operates stably, the on-line oxidant monitoring device monitors the ferrate concentration in the effluent of the coagulation sedimentation tank. The results show that they are all lower than the set value of 0.1 mg / L, indicating that the ferrate concentration in the produced water is relatively low and the produced water meets the inlet water requirements of the subsequent system.

[0079] The present invention has the following advantages:

[0080] 1. High sensitivity and accuracy

[0081] Electrochemical detection principle:

[0082] The working electrode 4 and the auxiliary electrode 5 directly detect the concentration of the oxidant (such as ferrate) through an electrochemical reaction, avoiding the problem of interference by the solution color and turbidity in the traditional spectrophotometry.

[0083] Signal amplification and processing:

[0084] The electrochemical workstation 9 combined with the signal amplifier 10 can significantly improve the intensity and stability of the detection signal, ensuring the accurate measurement of low-concentration oxidants.

[0085] 2. Real-time on-line monitoring ability

[0086] The device can collect the data in the sample detection pool 3 in real time and realize 24-hour uninterrupted monitoring through the information collection and control center 11, and promptly discover water quality anomalies.

[0087] Electrochemical detection does not require complex pretreatment steps and has a short response time.

[0088] 3. Strong anti-interference ability

[0089] Electrochemical detection does not rely on the light absorption of a specific wavelength, avoiding the interference of sample turbidity, color or coexisting substances on the measurement in spectrophotometry.

[0090] It is applicable to the effluent of coagulation clarifiers containing suspended solids, organic matter or high turbidity, ensuring the reliability of monitoring results.

[0091] Compared with redox titration, it does not require a large amount of chemical reagents, reducing the operating cost and the risk of secondary pollution.

[0092] The above is only an illustration of the best embodiment of the present invention, but it should not be construed as a limitation on the claims. The present invention is not limited to the above embodiments, and its specific structure allows changes. Any changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

[0093] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. An apparatus for on-line monitoring of oxidants in the effluent of a coagulation clarifier, characterized in that, It includes a sample detection cell (3) and an electrochemical workstation (9). A working electrode (4) and a counter electrode (5) are arranged in the sample detection cell (3). The working electrode (4) and the counter electrode (5) are connected to the electrochemical workstation (9), and the electrochemical workstation (9) is connected to an information collection and control center (11) via a signal amplifier (10).

2. The device for online monitoring of the oxidant in the effluent of the coagulation clarifier according to claim 1, characterized in that, The sample detection cell (3) is provided with a sample inlet and a sample outlet, and the sample inlet and the sample outlet are communicated with the outlet pipe (1) of the coagulation and clarification tank.

3. The device for online monitoring of oxidant in the effluent of a coagulation clarifier according to claim 2, wherein A first sampling valve (2) is arranged between the sample inlet and the outlet pipe (1) of the coagulation and clarification tank, and a second sampling valve (6) is arranged between the sample outlet and the outlet pipe (1) of the coagulation and clarification tank. The first sampling valve (2) and the second sampling valve (6) are one-way valves.

4. The device for on-line monitoring of oxidant in the effluent of a coagulation clarifier according to claim 1, characterized in that, The sample inlet and the sample outlet are provided with a filter cartridge (7).

5. The device for on-line monitoring of the oxidant in the effluent of the coagulation clarifier according to claim 4, characterized in that, The gap width of the filter cartridge (7) is 1 - 3 mm.

6. The device for on-line monitoring of oxidant in the effluent of a coagulation clarifier according to claim 1, characterized in that The working electrode (4) is a platinum electrode, and the plate area of the platinum electrode is 0.1 to 0.5 cm 2 ; the auxiliary electrode (5) is a graphite electrode; the working electrode (4) and the auxiliary electrode (5) are located at the central position of the sample detection cell (3).

7. The device for on-line monitoring of the oxidant in the effluent of the coagulation clarifier according to claim 1, wherein A current amplifier (8) is provided between the working electrode (4) and the electrochemical workstation (9), and the current gain of the current amplifier (8) is 10 8 to 10 10 times.

8. The device for on-line monitoring of oxidant in the effluent of a coagulation clarifier according to claim 1, characterized in that, The scanning range of the electrochemical workstation (9) is 0.6 - 1.0 V, and the scanning rate is 10 - 100 mV / s.

9. A method for on-line monitoring of oxidants in the effluent of a coagulation clarifier for the device according to any one of claims 1-8, characterized in that, It includes the following steps: The water discharged from the outlet pipe (1) of the coagulation and clarification tank enters the on-line monitoring device through the first sampling valve (2). When the water sample contains ferrate, the ferrate undergoes an oxidation-reduction reaction on the surface of the working electrode (4) in the sample detection cell (3). A current is generated on the surface of the working electrode (4), and the current is transmitted to the electrochemical workstation (9) after passing through the current amplifier (8), and then is amplified by the signal amplifier (10) and transmitted to the signal collection and control center (11) to obtain the ferrate content.

10. The method for on-line monitoring of the oxidant in the effluent of the coagulation clarifier according to claim 9, characterized in that, The ferrate concentration is calculated by the following formula: Where, C - ferrate concentration; V - scanning speed; Ip - peak current output by the electrochemical workstation.

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