TW201619066A - Method and apparatus for controlling Fenton system, and wastewater processing system - Google Patents

Abstract

The invention provides method and apparatus for controlling Fenton system, and a wastewater treatment system. Fe+2/H2O2 ratio optimal control, for example, can be achieved by monitoring at least a control parameter of the reaction system so as to control dosing from a low dosage. In an embodiment, the method for controlling Fenton system includes the following. Dissolved oxygen (DO) concentration of a Fenton system is monitored so as to obtain a DO concentration value (DOt). A catalyst is added to the Fenton system, in which the Fenton system includes water to be treated. When DOt is equal to 0 or smaller than a setting value A, an oxidizing agent (H2O2) is added or generated in the Fenton system; when DOt is equal to or greater than the setting value A, the addition or generation of the oxidizing agent is stopped, wherein the oxidizing agent includes at least hydrogen peroxide.

Description

Fenton reaction system control method, control device and wastewater treatment system

This application relates to the control of the Fenton reaction system, in particular to the dosing control method, control device and wastewater treatment system of the Fenton reaction system.

The Fenton wastewater treatment program is currently the most developed and advanced process for the treatment of various types of industrial/business wastewater in advanced Oxidation Processes (AOPs), such as dye/dyeing wastewater, landfill water, petrochemicals. Industrial wastewater, industrial wastewater containing benzene rings or toxic phenolic organic compounds. The Fenton program has been widely adopted for its excellent processing efficiency, low cost of pharmaceuticals, and considerable flexibility in the operation of the experiment. Although the Fenton program has the advantages of high efficiency and low operating cost, it also has a large disadvantage in application because it generates a large amount of iron sludge. These problems are directly related to the manipulation of dosing.

In the cost of the two main chemicals (Fe ^{+ 2} and H ₂ O ₂ ) of the Fenton program, H ₂ O _{2 is} about 3-10 times that of Fe ⁺² in terms of dosing amount. In addition, industrial grade H ₂ O ₂ price is about 2-3 times that of Fe ^+2. Therefore, H ₂ O _{2 is} much higher than Fe ⁺² in terms of chemical cost. Most Fenton programs use a fixed ratio of H ₂ O ₂ /Fe ⁺² to control the amount of H ₂ O ₂ added, but the best H ₂ O ₂ /Fe ⁺ required to treat wastewater of different nature. ² different dosing ratio, and the optimal range of different concentrations of H Fe ⁺² dosage of _2/2 O Fe ⁺² ratio of also different. At home and abroad, there is no research on how to determine the optimal H ₂ O ₂ /Fe ⁺² dosing ratio by automatic monitoring. Even the research and technology on how to reduce or effectively control the cost of H ₂ O ₂ dosing is relatively lacking.

Therefore, the optimal dosing ratio ([H ₂ O ₂ ]/[Fe ²⁺ ]) in the Fenton reaction must rely on the operator's experience to adjust the dosing ratio. Inappropriate dosing ratio can easily lead to treatment efficiency. Poor and increase the cost of dosing, so how to effectively control the dose to effectively use the Fenton reaction for the industry to solve the problem.

In view of this, the present application proposes a Fenton reaction system control method, a control device, and a wastewater treatment system, and controls the optimal [H ₂ O ₂ ]/[Fe ²⁺ ] dosing by monitoring the numerical changes of the control parameters in the system. ratio.

One embodiment of the present invention provides a Fenton reaction system control method comprising at least monitoring a dissolved oxygen (DO) concentration in a Fenton reaction system and obtaining a DO concentration value (DOt). A catalyst is added to the Fenton reaction system, wherein the Fenton reaction system contains water to be treated. When the DOt is equal to 0 or less than the set value A, an oxidant is added or generated in the Fenton reaction system, and when the DOt is equal to or greater than the set value A, the addition or stop of the generation of the oxidant is stopped; wherein the oxidant is at least Contains hydrogen peroxide.

An embodiment of the present invention provides a Fenton reaction control device, which at least includes: a dissolved oxygen sensing device and a local control unit. The dissolved oxygen sensing device is used to monitor the dissolved oxygen (DO) in a Fenton reaction cell to obtain a DO concentration value (DOt). a local control unit that emits a control signal C1 according to at least DOt to add or generate an oxidant in the Fenton reaction tank, wherein when DOt is equal to 0 or less than the set value A, an oxidant is added or generated in the Fenton reaction system. When DOt is equal to or greater than the set value A, the addition or stop of the generation of the oxidant is stopped.

One embodiment of the present invention provides a wastewater treatment system comprising: a Fenton reaction tank, the aforementioned Fenton reaction system control device, and a chemical liquid addition unit. The Fenton reaction tank is used to treat the water to be treated by the Fenton method. The drug solution addition unit is configured to respond to the dosing control signal to selectively add at least the oxidant to the Fenton reaction cell.

In order to make the various aspects and the aspects of the invention described above more readily apparent, the detailed description will be described in the accompanying drawings.

The following describes various embodiments of the Fenton reaction system control method, control device, and wastewater treatment system. In addition, the implementation aspect will be used to discuss the effect of the Fenton reaction system control method dominated by the control parameter dissolved oxygen (DO) on wastewater treatment.

According to the first embodiment of the present invention, the Fenton system is controlled by using the control parameter dissolved oxygen (DO) in the Fenton reaction system, and a Fenton reaction system control method is proposed. Please refer to FIG. 1, which is a flow chart of a Fenton reaction system control method according to a first embodiment of the present invention. As shown in Fig. 1, the Fenton reaction system control method includes monitoring the dissolved oxygen (DO) concentration in the Fenton reaction system and obtaining a DO concentration value (DOt) as shown in step S10. As shown in step S20, a catalyst is added to the Fenton reaction system, wherein the Fenton reaction system contains water to be treated. Next, as shown in step S25, the range of the value of DOt is determined, thereby controlling the Fenton reaction system. For example, when DOt is equal to 0 or less than the set value A (A>0), then as shown in step S30, an oxidant is added or generated in the Fenton reaction system. And each time the oxidant is added or generated (as shown in step S30), step S10 may be continued, and step S30 may be performed one or more times to make the value of the DOt of the Fenton reaction system trend or control at the set value A. Within the scope. When DOt is equal to or greater than the set value A, step S40 is performed to stop the addition or stop of generating the oxidant. Further, when the addition or stop of the generation of the oxidant is stopped (as shown in step S40), the control method may proceed to step S10 to continue monitoring the value of the DOt of the Fenton reaction system so as to be within the range of the set value A. The set value A can be set to 1.0 mg/L or more, such as 1.5 mg/L, 2.0 mg/L, but the embodiment does not limit this.

The first embodiment of the present invention utilizes dissolved oxygen (DO) in the Fenton reaction system as a control parameter of the Fenton reaction system, and is suitable for the case where the initial DOt value of the Fenton reaction system is less than the set value A. . It can extend this application to various Fenton reaction systems, at least monitor the value of DO therein, and control the dosing with a set value A using, for example, a DO controller; thus, it is possible to effectively control the dosing of the oxidant in the Fenton reaction system. The amount and the problem of excessive waste and cost increase which may be caused by the standard dosing control method can be avoided.

According to the method described in the first embodiment, in the second embodiment of the present invention, the Fenton reaction system in which the relationship between DO and ORP changes is known, the oxidation-reduction potential in the Fenton reaction system can be utilized ( ORP) is used as another control parameter to confirm whether the addition or production of oxidant is appropriate. The Fenton reaction system control method of the second embodiment includes the steps of the first embodiment, as shown in FIG. 2, and the second embodiment may further include: monitoring the redox in the Fenton reaction system as shown in step S50. The potential (ORP) and the ORP value (ORPt). As shown in step S55, when DOt is A1, the range of the value of ORPt is further determined, thereby controlling the Fenton reaction system to decide whether to add or generate an oxidant, or to stop adding or stopping the generation of an oxidant, wherein A>A130. For example, when DOt is A1 and ORPt is less than the set value B1 corresponding to DOt being A1, then adding or generating an oxidant in the Fenton reaction system is performed as shown in step S57. And each time the oxidant is added or produced (as shown in step S30), step S10 or S50 can be continued. When DOt is A1 and ORPt is equal to or greater than the set value B1, then as shown in step S59, the addition or stop of the generation of the oxidant is stopped, wherein A>A130.

In the second embodiment, the set value B1 can be regarded as the upper limit of the ORPt corresponding to when DOt is equal to A1, so that the addition or generation of the oxidant is stopped when the ORPt reaches or exceeds the upper limit. Further, according to the first embodiment, when DOt changes from a certain initial value (for example, 0 mg/L) to a set value A (for example, 2 mg/L), for example, the value of DOt (referred to as A1) is 0, 0.1, 0.5, 1.0, 1.1, 1.5, etc., there will be a corresponding value of ORPt, for example, the expected ORPt varies from 530mV to 560mV, so with the second embodiment, the value of ORPt reaches or exceeds When the upper limit of the ORPt corresponding to the value of DOt indicates that a condition has occurred, such as a malfunction of the monitoring device or a condition of the water component to be treated contained in the Fenton reaction system or a change in the composition of the water to be treated, the second embodiment is more achievable. In the case of conditions, avoid excessive dosing or its effects and the role of warning conditions. For example, the set value B1 (ie, the upper limit) of the corresponding ORPt may be set for the value A1 of DOt (for example, A1 is equal to 0, 0.1, 0.5, 1.0, 1.1, or 1.5, etc.); or the range of variation for A1 (For example, the interval [0, 2); the interval [0, 1] and the interval (0, 2)), the set value B1 (ie, the upper limit) of the corresponding ORPt is set in the interval of the variation range.

Cover For a Fenton reaction system, the DO system has a positive relationship with the change in ORP. For the same DOt variation range, such as DOt from 0 mg/L to 2.0 mg/L, different Fenton reaction systems will produce different ORP corresponding values. Therefore, the application of the second embodiment can be extended to various Fenton reaction systems, at least the values of ORP and DO can be monitored, and the dosing can be controlled in a set value control manner by using, for example, DO and ORP controllers; thus, effective Controlling the dosage of oxidant in the Fenton reaction system, and avoiding the waste and cost of overdosing that may be caused by the standard dosing control method.

In the third embodiment of the present invention, the lower limit C1 of the ORPt corresponding to the DOt equal to A1 can be set. In the third embodiment, the Fenton reaction system control method includes, in addition to the steps of the first embodiment, as shown in FIG. 3, further comprising: monitoring the redox potential (FRP) in the Fenton reaction system as shown in step S50. And get the ORP value (ORPt). As shown in step S65, when DOt is A1, the range of the value of ORPt is further determined, thereby controlling the Fenton reaction system to decide whether to add or generate an oxidant, or to stop adding or stopping the generation of an oxidant, where A>A130. For example, when DOt is A1 and ORPt is less than the set value B1 corresponding to when DOt is A1, and ORPt is greater than or equal to the set value C1 corresponding to when DOt is A1, the addition is performed as shown in step S67. Or generating an oxidant in the Fenton reaction system. And each time the oxidant is added or produced (as shown in step S30 or step S57), step S10 or S50 may be continued. When DOt is A1 and ORPt is equal to or greater than the set value B1 or ORPt is less than the set value C1, then as shown in step S69, the addition or stop of generating the oxidant is stopped, wherein A>A130, B1>C1. Further, the setting method of the setting value C1 can be analogized by the example of the setting value B1 described above, and therefore will not be described again.

In the second embodiment or the third embodiment described above, when the value of ORPt exceeds the upper limit or falls below the lower limit, as shown in step S59 or S69, although the addition or generation of the oxidant is stopped, the Fenton reaction system is still in the reaction. In general, the DO value will be reduced accordingly. Therefore, in implementing the above embodiments, the control method can continue to perform step S10, and then continue to monitor the value of the DOt of the Fenton reaction system so that it is at the set value A. In the range.

In the foregoing second embodiment or the third embodiment, when the value of the ORPt exceeds the upper limit or falls below the lower limit, it may indicate that the reaction system or the monitoring instrument has a condition, so that the addition or generation of the oxidant is stopped. If this happens, field personnel can check to see if the reaction system is in a condition; if there is a condition, further action can be taken and waste can be avoided by continuing to add the drug. For another example, when the addition or stop of the generation of the oxidant is stopped due to the above situation, the device performing the control method may further record the situation or issue a message to notify the relevant person to pay attention or handle. However, the implementation of the present invention is not limited thereto, and various other auxiliary treatment methods can be established to allow the oxidant addition amount to be well controlled, and the Fenton reaction system can be efficiently processed.

Further, any of the above embodiments can be further monitored in combination with the dosing ratio of the oxidizing agent and the catalyst, thereby proposing a fourth embodiment of other control modes. In the fourth embodiment, the Fenton reaction system control method may further comprise the following steps: (1) monitoring the dosage of the oxidant and the catalyst. (2) when the ratio of the oxidant to the catalyst is greater than a dosing ratio, the catalyst is added to the Fenton reaction system; when the ratio of the oxidant to the catalyst is less than the dosing ratio, then An oxidant is produced in the Fenton reaction system. (3) When the ratio of the oxidizing agent to the catalyst is equal to the dosing ratio, the addition or generation of the oxidizing agent is stopped, and the addition of the catalyst is stopped. In addition, in the implementation aspect of the dosing ratio of the oxidant and the catalyst, in the actual implementation, the ratio of the oxidant and the catalyst dosing amount is equal to the dosing ratio due to the possibility of error in the monitoring or calculation of the dosing ratio. The meaning should be regarded as the ratio of the oxidant and the catalyst dosing amount equal to the dosing ratio under a tolerance (for example, 1%, 5%, etc.). Further, when the addition or stop of the generation of the oxidant is stopped, the control method may continue to proceed to step S10 to continue monitoring the value of the DOt of the Fenton reaction system so as to be within the range of the set value A.

In the above embodiment, the manner and sequence of addition of the catalyst and the oxidant are not limited. For example, in one embodiment of the above method, wherein an oxidizing agent may be added prior to the addition of the catalyst. In still another embodiment of the above method, wherein the catalyst is added prior to the addition of the oxidant. In still another embodiment of the above method, the oxidizing agent and the catalyst may be first mixed into a mixed liquid, and then the mixed liquid is added to the Fenton reaction system.

In an embodiment of the above method, there are at least two ways of adding an oxidizing agent to the Fenton reaction system, for example, adding a dose of an oxidizing agent to the Fenton reaction system or generating a dose of an oxidizing agent in the Fenton reaction system. Therefore, in the step S30, S57 or S67, the description of adding or generating an oxidizing agent to the Fenton reaction tank is shown, however, the embodiment of the present invention is not limited thereto. For example, in the embodiment of the above method, the amount of the oxidizing agent added in the step S30, S57 or S67 (i.e., the amount of addition or the amount of production) may be the same or different. In addition, in practice, step S30, S57 or S67 may be executed multiple times, and when each step is executed again, the amount of oxidant added may be the same or different compared to the previous execution, for example, each time The amount of 10_ml of oxidant, such as oxidant, is either decreasing or increasing. In practice, when the Fenton reaction system is visible, for example, the condition of the water to be treated (for example, the amount or type of water to be treated) or other conditions related to the reaction, the amount of oxidant added or generated is appropriately set or adjusted. the amount. The water to be treated described above may be waste water or water containing organic matter or the like.

In the above method, the Fenton reaction system may be a conventional Fenton reaction system, an electrolytic reduction-Fenton reaction system, a fluidized bed-Fenton reaction system, or a photo-Fenton reaction system. However, embodiments of the present invention are not limited thereto, and any reaction system based on Fenton oxidation can be applied to the above method.

In accordance with another aspect of the present invention, an embodiment of a Fenton reaction system control apparatus for a wastewater treatment system is proposed to utilize a Fenton reaction to treat sewage or organic contaminants.

Referring to Figure 4, there is shown a schematic block diagram of a Fenton reaction system control unit 10 in accordance with a fifth embodiment of the present invention in an embodiment of the wastewater treatment system 1.

As shown in FIG. 4, the wastewater treatment system 1 includes a Fenton reaction system control device 10, a Fenton reaction tank 20, and a chemical liquid addition unit 30. For example, the Fenton reaction tank is a reaction tank for performing advanced treatment techniques of the Fenton family, such as a conventional Fenton reaction tank, an electrolytic reduction-Fenton reaction tank, a fluidized bed-Fenton reaction tank, or a photo-Fenton reaction tank, but the practice of the present invention The method is not limited to this.

In the fifth embodiment, the Fenton reaction system control device 10 includes at least a dissolved oxygen (DO) sensing device 11 and a local control unit 13. The dissolved oxygen sensing device 11 is used to monitor the dissolved oxygen (DO) in the Fenton reaction tank 20 to obtain a DO concentration value (DOt). The redox potential sensing device 12 is used to monitor the redox potential ORP in the Fenton reaction cell to obtain an ORP value (ORPt). The local control unit 13 sends a control signal SC1 according to at least DOt to add or generate an oxidant in the Fenton reaction tank, wherein when DOt is equal to 0 or less than the set value A, an oxidant is added or generated in the Fenton reaction system. When DOt is equal to or greater than the set value A, the addition or stop of the generation of the oxidant is stopped. The Fenton reaction system control device 10 of this embodiment can be used to implement the Fenton reaction system control method of the first embodiment described above.

In a fifth embodiment, the Fenton reaction system control device 10 according to the present invention, in addition to the above device, may further include an oxidation reduction potential (ORP) sensing device 12 for monitoring redox in the Fenton reaction tank. The potential ORP is obtained to obtain an ORP value (ORPt). In this case, the local control unit 13 further sends the control signal SC1 according to DOt and ORPt to add the oxidant to the Fenton reaction tank, wherein when DOt is A1 and ORPt is less than the set value corresponding to DOt being A1. At B1, the local control unit 13 sends the control signal SC1 to add or generate the oxidant in the Fenton reaction system. When DOt is A1 and ORPt is equal to or greater than the set value B1, the addition or stop of generating the oxidant is stopped. , where A>A130. The Fenton reaction system control device 10 of this embodiment can be used to implement the Fenton reaction system control method of the second embodiment described above.

In addition, in the fifth embodiment, the Fenton reaction system control device 10 according to the present invention is further configured based on the third embodiment described above: when DOt is A1, the ORPt system is smaller than the set value B1, and the ORPt system is When the value is greater than or equal to the set value C1 corresponding to when the DOt is A1, the local control unit 13 sends the control signal SC1 to add or generate the oxidant in the Fenton reaction system. When DOt is A1 and ORPt is equal to or greater than the setting. When the value B1 or ORPt is less than the set value C1, the addition or stop of the generation of the oxidant is stopped, wherein A>A130, B1>C1.

Further, the embodiment of any of the aforementioned Fenton reaction system control devices can be further configured to monitor the dosing ratio of the oxidant and the catalyst. For example, the Fenton reaction system control device is configured such that the local control unit monitors the oxidant and the dosing amount of the catalyst; when the ratio of the oxidant to the catalyst is greater than a dosing ratio, the local control unit issues a control signal SC2 to add the catalyst to the Fenton reaction system; when the ratio of the oxidant to the catalyst is less than the dosing ratio, the local control unit sends the control signal SC1 to add or generate the oxidant In the Fenton reaction system, when the ratio of the oxidizing agent to the catalyst is the dosing ratio, the addition of the oxidizing agent and the catalyst is stopped. Therefore, the local control unit 13 can be configured to control the Fenton reaction system in different ways, and thus is not limited to the above.

For example, Figure 5 shows a schematic block diagram of another embodiment of a Fenton reaction system control apparatus in accordance with a sixth embodiment of the present invention. In FIG. 5, the local control unit 13 includes, for example, a data processing device 111, a storage device 112, and a communication device 113. The data processing device 111 collects values for the control parameters of the Fenton reaction tank 20, the control parameters including at least DOt. The storage device 112 is used by the data processing device 111. The communication device 113 is configured to enable the data processing device 111 to communicate with the outside, wherein the communication device 113 transmits at least a portion of the collected values to the outside via a communication link LK. The local control unit 13 can be implemented as part of an embedded system, a computer system, a proprietary electronic device, or a control system.

In the sixth embodiment, the Fenton reaction system control device 10 further includes a remote control unit 50. The communication device 113 of the local control unit 13 is coupled to the remote control unit 50 via a communication link LK. The remote control unit 50 performs arithmetic processing (eg, statistics, analysis, and judgment) according to data of the plurality of control parameters to instruct the local control unit 13 to issue the dosing control signal SC1 to add the oxidant to the Fenton reaction tank 20; or to indicate the local control unit The dosing control signal SC2 is issued to add the catalyst to the Fenton reaction tank 20. In this embodiment, the remote control unit 50 shares the operation of the local control unit 13, and performs, for example, statistics, analysis, and judgment on the Fenton response in the Fenton reaction tank 13 based on the data collected at the local end, and communicates through communication. LK regulates the distal end of the Fenton reaction tank 20 to control at least the amount of oxidant added.

In addition, in the sixth embodiment, the local control unit 13 or the remote control unit 50 in the above embodiment may be further configured to control other processes related to the Fenton reaction tank 13 according to requirements, such as water to be treated. Controls into or/and in and out, such as control of catalyst addition, and other controls associated with Fenton reactions such as pH control. Furthermore, the local control unit 13 or the remote control unit 50 in the above embodiment may be further configured to control the Fenton according to the DO value, the ORP value and other one or more control parameters such as pH value and conductivity. The treatment of the reaction tank 13, such as the control of the entry or/and access of the water to be treated, is, for example, the control of the addition of the catalyst, and the control of other Fenton-related reactions such as the pH of the pH.

In addition, in other embodiments, statistical analysis may be performed on one or more control parameters, such as DO value, ORP value, pH value, or conductivity, so as to correlate analysis results and trends. The record is referenced when the local control unit 13 or the remote control unit 50 is used to process the next step of the water to be treated. For example, the statistical analysis result can be displayed on the display of the local control unit 13 or the remote control unit 50 or the terminal device 60, so that the manager can refer to and understand the processing effect or the cost of medication.

The above communication link LK is, for example, a wired or wireless or a combination of communication links or networks such as a regional network, an internet or a mobile network, or a combination thereof. In addition, in an implementation aspect, the remote control unit 50 can be more regarded as a server or replaced by a cloud computing system, whereby other terminal devices 60 connected to the network, such as a personal computer, a tablet computer, a smart phone, etc. Instant online monitoring. In another embodiment, the local control unit 13 can also be connected to the terminal device 60 through the network for online on-line monitoring. These implementations of real-time monitoring allow the wastewater treatment system to be more flexible and immediacy in monitoring the amount of dosing and the amount of water to be treated.

According to still another aspect of the present invention, the wastewater treatment system 1 of the present invention includes a Fenton reaction tank 20, a Fenton reaction system control device 10, and a chemical liquid addition unit 30. Various embodiments of the Fenton reaction system control device 10 are as described above, and are not described herein again. The Fenton reaction tank 20 is for treating a water to be treated by the Fenton method. The chemical solution adding unit 30 responds to the dosing control signal issued by the local control unit 13 to selectively add at least the oxidizing agent to the Fenton reaction tank. The processing method of the chemical solution adding unit 30 can be implemented in different manners, and is not limited to the above. For example, the chemical solution adding unit 30 is further configured to selectively add a catalyst to the Fenton reaction tank.

The drug solution addition unit 30 includes one or more dosing pumps, such as a dosing pump to control the addition of water to be treated and another dosing pump to control the addition of the oxidant. In another example, the chemical liquid addition unit 30 can be further used to control the amount of addition of the catalyst. Therefore, the chemical liquid addition unit 30 can be implemented in different manners, and thus is not limited to the above. For different implementations, the dosing control signal sent by the Fenton reaction system control device 10 can be configured to correspond to the embodiment of the drug solution adding unit 30, for example, when a dosing pump is used to control the addition of the oxidant. The dosing control signal can be configured as a switching signal; when two dosing pumps are used to separately control the water (or catalyst) and the oxidant to be treated, the dosing control signal can be configured as two switching signals. The configuration of the dosing pump can be implemented in different ways, so it is not limited to the above.

In the wastewater treatment system of the present invention, for example, the wastewater treatment system 1 may further include one or more pumps and one or more treatment tanks. A pump (e.g., a dosing pump) is used to selectively discharge the reacted liquid in the Fenton reaction tank 20; the treatment tank is used to treat the reacted liquid in the Fenton reaction tank 20. However, the wastewater treatment system of the present invention is not limited thereto. For example, the treatment tank 40 (please refer to FIG. 4) is used as a coagulation sedimentation tank to discharge the liquid after the reaction in the Fenton reaction tank to the treatment tank 40 for coagulation sedimentation treatment. The coagulation sedimentation treatment is carried out by mixing the solution of the Fenton reaction with an alkali agent (for example, calcium hydroxide or sodium hydroxide), and then coagulation and precipitation, and the calcium hydroxide (or sodium hydroxide) is adjusted to pH=7.0±0.1. . The processing method of the processing tank can be implemented in different ways, and thus is not limited to the above. Further, a pump 31 may be provided in the wastewater treatment system 1 of this embodiment to selectively discharge the reacted liquid in the Fenton reaction tank to the treatment tank 40.

Please refer to Figure 6, which shows a schematic block diagram of other embodiments of a wastewater treatment system. In FIG. 6, the wastewater treatment system includes a plurality of Fenton reaction tanks 20, and each of the Fenton reaction tanks is provided with a respective Fenton reaction system control device 10 and a chemical liquid addition unit 30, and these Fenton reaction system control devices are all connected to the remote control unit. 50 has a communication link. In this manner, the remote control unit 50 can grasp the reaction conditions of the respective Fenton reaction tanks to effectively perform wastewater treatment. [Examples]

Hereinafter, the present invention will be described by way of examples, but the invention is not limited to the examples. In addition, the evaluation of the characteristics 在 in each of the examples was carried out by the following method.

Example 1 to Example 4 were carried out using 4 different ferrous influent concentrations of 200, 300, 400 and 500 mg/L, respectively, and the residual hydrogen peroxide concentration, ferrous residual concentration and COD value in the water sample were analyzed. And chromaticity, the details will be briefly described below. "COD value"

The COD value (EPA 5220 D) was measured using a COD reagent prepared by the same modulation method as the commercially available COD reagent. Each experiment requires a COD calibration line made of potassium hydrogen phthalate (Panreac, concentration: 99.8%), and the COD calibration line also ensures the quality of the COD reagent. The COD reagent (HACH COD 20-1500 mg/L) was used for analysis. The COD reagent was added to the COD heater (CR-25) for 2 hours, and the COD water sample at 150 ° C was closed and reflux heated to obtain a spectrophotometer. The absorbance of the sample at a wavelength of 620 nm was measured, and a calibration curve was prepared to obtain a COD value by interpolation. Chroma

Chromaticity (APHA 2120 E.) is to set the spectrophotometer to the transmittance (%T) mode, scan the visible light band (400 nm-700 nm), and measure the transmittance per unit of 10 nm. The 31 values are obtained by converting the formula of the calibration line. "H ₂ O ₂ Residual Concentration"

The H ₂ O ₂ residual concentration is a yellow compound formed by reacting tetravalent titanium (using potassium oxalate titanate, manufactured by K.K., Ltd., concentration: 95%) with hydrogen peroxide under acidic conditions as shown in the reaction formula (1). The principle is to measure the absorbance of the yellow substance at a wavelength of 400 nm by a spectrophotometer, and to prepare a calibration curve by interpolation. Ti ⁺⁴ + H ₂ O ₂ + 2H ₂ O → H ₂ TiO ₄ + 4H ⁺ (Reaction formula (1)) "Fe ⁺² residual concentration"

The Fe ⁺² residual concentration is formed by using a pheniramine reagent (using 1,10-Phenanthroline, manufactured by Merck) as shown in the reaction formula (2) to form an orange-red compound with a divalent metal ion. The principle is to measure the absorbance of the red substance at a wavelength of 510 nm by a spectrophotometer, and to prepare a calibration curve by interpolation. Fe ⁺² +3phenH ⁺ →Fe(phen ₃ ) ⁺² +3H ⁺ (Reaction formula (2)) "Water to be treated"

The water to be treated WA used in the experiment provided the chromaticity value in the wastewater using the reactive dye Reactive Blue 49, and the chemical structure of the reactive dye Reactive Blue 49 was as follows (1); the COD value was provided using polyvinyl alcohol, and the simulation was carried out. The wastewater has an ADMI value of 9000 ± 300; the COD value is 1000 ± 100 mg / L. Before the experiment, the pH value suitable for the Fenton reaction was adjusted with sulfuric acid and sodium hydroxide, and the pH was adjusted to 2. (Chemical Formula (1))

In the experiment, the simulated wastewater treatment was simulated. The wastewater and the medicament were pumped into the reaction tank by a peristaltic pump. After a treatment of hydraulic retention time (HRT), the water discharged from the upper discharge port and replaced the traditional bottle with HRT. The reaction time of the experiment was maintained, and the ferrous inflow concentration in the reaction system was maintained at a certain value. The experimental design of the HRT is 60 minutes, and the algorithm is calculated as equation (1). Before the experiment, it is necessary to wait for the wastewater and the medicament to flow from the beginning to the discharge port, and then through a system stabilization period of HRT, it is possible to start sampling from the discharge port and proceed with the experimental analysis. (Calculation Formula (1)) "Embodiment 1"

The Fenton reaction system control device used in the embodiment is as shown in FIG. 7, and the Fenton reaction system control device 70 is composed of a reaction tank 71, a pH sensing device 72 (WTW SenTix® RO series), and an ORP sensing device 73 (WTW). SenTix® RO series), DO sensing device 74 (model: METTLER TOLEDO O2-sensor InPro 6050/120), control unit 75 (model: SUNTEX TRANSMITTER PC-5300, PC5100 and EC-430) and conductivity sensing device 76 (Model: SUNTEX 8-12-6). The effective volume of the reaction tank 71 is about 1.8 liters of the booster cylinder groove, the anode is a titanium-based ruthenium rod electrode, the cathode is a stainless steel cylinder mesh electrode, and the power supply 77 is applied with a current density of 6.4 mA/ Cm ² . The water inlet line at the bottom of the reaction tank 71 is connected to a pump 78, a pump 79, and a pump 80 for injecting the oxidant, the catalyst, and the water to be treated WA into the reaction tank 71, respectively. The pump uses a micro-peristaltic pump (MasterFlex Cole Parmer L/S® digitally adjustable flow pump).

First, in the Fenton reaction tank 71 shown in Fig. 7, the waste water to be treated is pumped into a continuous reaction tank, and the ferrous sulfate (manufactured by Merck, concentration: 95%) having a concentration of the reaction is continuously pumped into the reaction. The tank was controlled to have a concentration of 200 mg/L, and H ₂ O ₂ (manufactured by Panreac Co., Ltd., concentration: 33%) was continuously drawn to generate a Fenton reaction, and the DO value or ORP value in the reaction tank was continuously detected. Control the amount of H ₂ O ₂ added. At the beginning of the experiment, a set of outflow water samples were taken at intervals of 10 minutes, and a total of seven groups of water samples were taken at 0 min, 10 min, 20 min, 30 min, 40 min, 50 min and 60 min, with a pore diameter of 0.45. A mixed fiber filter membrane (∮47 mm) of μm was separately filtered to obtain impurities in the aforementioned water sample.

Next, for the run water treated by Fenton, that is, the water sample after the removal of the impurities, respectively, an alkali agent Ca(OH) ₂ (manufactured by Panreac Co., Ltd., concentration: 95%), and NaOH (manufactured by Panreac Co., Ltd., concentration: 98) %) adjust the alkalinity to pH=7.0±0.1, then carry out slow mixing for 30 minutes to form a rubber feather, and then let stand for another 30 minutes, thereby performing coagulation precipitation treatment, and then taking the upper layer clear liquid, and measuring by the above-mentioned analytical method. The COD value, the chromaticity value, the residual hydrogen peroxide concentration, and the ferrous residual concentration are obtained.

The data obtained above were plotted on the horizontal axis with the DO concentration as the horizontal axis, and the COD removal rate, the chromaticity removal rate, the residual hydrogen peroxide concentration, the ferrous residual concentration, and the H ₂ O ₂ /Fe ⁺² dosing ratio were respectively The axis is plotted against ORP, and the results are shown in Figures 8A, 9A, 10A, 11A, and 12A. <<Example 2》

A Fenton reaction system control device as shown in Fig. 7 is also used in this embodiment. Except that the concentration and the added amount of ferrous sulfate were changed to 300 mg/L, respectively, the same operation as in Example 1 was carried out, and a set of outflow water samples were taken every 10 minutes from the beginning of the experiment, respectively, taking the 0 min. A total of seven groups of water samples were prepared at 10 min, 20 min, 30 min, 40 min, 50 min and 60 min, and the impurities in the water samples were obtained by filtering the mixed fiber filter membrane (∮47 mm) of 0.45 μm.

Next, in the same manner as in Example 1, the COD value, the chromaticity value, the residual hydrogen peroxide concentration, and the ferrous residual concentration were obtained by the above-described analysis methods. The data obtained above were plotted on the horizontal axis with the DO concentration as the horizontal axis, and the COD removal rate, the chromaticity removal rate, the residual hydrogen peroxide concentration, the ferrous residual concentration, and the H ₂ O ₂ /Fe ⁺² dosing ratio were respectively The axis is plotted against the ORP, and the results are shown in Figures 8B, 9B, 10B, 11B, and 12B. Example 3

A Fenton reaction system control device as shown in Fig. 7 is also used in this embodiment. Except that the concentration and the added amount of ferrous sulfate were changed to 400 mg/L, respectively, the same operation as in Example 1 was carried out, and a set of outflow water samples were taken every 10 minutes from the beginning of the experiment, respectively, and the 0 min was taken respectively. A total of seven groups of water samples were prepared at 10 min, 20 min, 30 min, 40 min, 50 min and 60 min, and the impurities in the water samples were obtained by filtering the mixed fiber filter membrane (∮47 mm) of 0.45 μm.

Next, in the same manner as in Example 1, the COD value, the chromaticity value, the residual hydrogen peroxide concentration, and the ferrous residual concentration were obtained by the above-described analysis methods. The data obtained above were plotted on the horizontal axis with the DO concentration as the horizontal axis, and the COD removal rate, the chromaticity removal rate, the residual hydrogen peroxide concentration, the ferrous residual concentration, and the H ₂ O ₂ /Fe ⁺² dosing ratio were respectively The axis is plotted against ORP, and the results are shown in Figures 8C, 9C, 10C, 11C, and 12C. Example 4

A Fenton reaction system control device as shown in Fig. 7 is also used in this embodiment. Except that the concentration and the added amount of ferrous sulfate were changed to 500 mg/L, respectively, the same operation as in Example 1 was carried out, and a set of outflow water samples were taken every 10 minutes from the start of the experiment, respectively, taking the 0 min. A total of seven groups of water samples were prepared at 10 min, 20 min, 30 min, 40 min, 50 min and 60 min, and the impurities in the water samples were obtained by filtering the mixed fiber filter membrane (∮47 mm) of 0.45 μm.

Next, in the same manner as in Example 1, the COD value, the chromaticity value, the residual hydrogen peroxide concentration, and the ferrous residual concentration were obtained by the above-described analysis methods. The data obtained above were plotted on the horizontal axis with the DO concentration as the horizontal axis, and the COD removal rate, the chromaticity removal rate, the residual hydrogen peroxide concentration, the ferrous residual concentration, and the H ₂ O ₂ /Fe ⁺² dosing ratio were respectively The axis is plotted against ORP, and the results are shown in Figures 8D, 9D, 10D, 11D, and 12D.

"Experimental Results" The above-mentioned Embodiments 1 to 4 are at least monitoring the values of pH value, ORP value, DO value and conductivity in the system, wherein the value of DO value is used as a control basis to explore the optimal control point. The control unit 75 actuates the medicine and automatically adjusts the dosing ratio. When the DO sensing device 74 senses a DO value of ₂ , 6, 20, 40 mg/L, the dosing amount of H ₂ O ₂ is controlled. In addition, when the DO value is less than 2 mg/L, since the monitoring of the low DO value is liable to cause an error, the control of the DO value is unstable, and it is not easy to effectively monitor. Therefore, when DO=0 mg/L, the relative ORP value is used as the control point. The experimental results of the Fenton reaction were carried out under the operating conditions of Examples 1 to 4 by taking the DO value and the ORP value as control values as follows. "Fig. 8A to Fig. 8D, Fig. 9A to Fig. 9D"

8A to 8D and 9A to 9D are graphs showing changes in COD removal rate and chromaticity removal rate of Embodiments 1 to 4 of the present invention, respectively, wherein solid lines and broken lines respectively indicate the use of NaOH, Ca (OH). ₂ The COD removal rate and the chromaticity removal rate were analyzed after coagulation precipitation. From Fig. 8A to Fig. 8D, Fig. 9A to Fig. 9D, it is apparent that in the Fenton program reaction system, when DO is equal to 0 mg/L, the Fenton program has a significant decrease in COD and chromaticity removal rate; When the value is equal to 2 mg/L, the COD and chromaticity removal rate reach a high point; and when the DO value is greater than 2 mg/L, the COD and chromaticity removal rates are only slightly increased. For example, when DO becomes 6, 20, and 40 mg/L, even if more H ₂ O _{2 is} added, there is no significant improvement effect; in other words, although the H ₂ O ₂ /Fe ⁺² dosing ratio is increased, COD and The removal rate of chromaticity is significantly improved.

Secondly, in order to reduce the influence of the increase of the chromaticity of the discharged water caused by the large amount of ferric ions formed after the Fenton reaction, an alkali agent such as Ca(OH) ₂ is added to the drainage after the Fenton oxidation reaction to adjust the pH. Neutral and coagulation precipitation. From the COD and the chromaticity removal rate shown in FIGS. 8A to 8D and 9A to 9D, it was confirmed that the use of Ca(OH) ₂ is more excellent than the use of NaOH. "Fig. 10A to Fig. 10D, Fig. 11A to Fig. 11D"

10A to 10D and 11A to 11D are graphs showing changes in residual concentration of hydrogen peroxide and ferrous iron according to Examples 1 to 4 of the present invention, and Figs. 11A to 11D, respectively. From Fig. 10A to Fig. 10D, Fig. 11A to Fig. 11D, it can be confirmed that in the reaction system of the Fenton program, when DO is equal to 0 mg/L, the residual Fe ⁺² concentration can be found to reach a high point, but the H ₂ O ₂ concentration is maintained. At a low value; when the DO value is equal to 2 mg/L, the Fe ^{+ 2} concentration and the H ₂ O ₂ concentration remaining in the reaction system are relatively low in the ideal range; and when DO is greater than 2 mg/L, for example, When the ratios were 6, 20, and 40 mg/L, the residual Fe ^{+ 2} concentration rapidly decreased, but the residual H ₂ O ₂ concentration rapidly increased. "Figure 12A to 12D"

12A to 12D are graphs showing changes in the H ₂ O ₂ /Fe ⁺² dosing ratio of Examples 1 to 4 of the present invention. From Fig. 12A to Fig. 12D, it can be confirmed that in the reaction system of the Fenton program, when DO is equal to 0 mg/L, the H ₂ O ₂ /Fe ⁺² dosing ratio drops rapidly, indicating that the amount of H ₂ O ₂ added is insufficient; When the DO ratio is greater than 0 mg/L, the H ₂ O ₂ /Fe ⁺² dosing ratio gradually increases to a value of 2 mg/L, and the H ₂ O ₂ /Fe ⁺² dosing ratio gradually becomes a stable value; when DO is greater than 2 At mg/L, for example, at 6, 20, and 40 mg/L, the H ₂ O ₂ /Fe ⁺² dosing ratio is getting higher and higher, indicating that the amount of H ₂ O ₂ added has been excessive.

In addition, Table 1 is an experimental result obtained by arranging the experimental results of FIGS. 8A to 8D, 9A to 9D, 10A to 10D, 11A to 11D, and 12A to 12D, and is different in each embodiment. best H ₂ O ₂ / Fe ⁺² ratio medicated dosage of Fe ^+2, relative to the H ₂ O ₂ dosage, the DO value of the optimal H ₂ O ₂ / Fe ⁺² ratio dosing ( Mg/L) and corresponding ORP values and other parameters. 【Table 1】

As shown in Table 1, it is understood that the optimum H ₂ O ₂ /Fe ⁺² dosing ratio in each of the examples does not become a fixed value, but varies depending on the Fe ⁺² dosing amount, for example, The optimum H ₂ O ₂ /Fe ⁺² dosing ratios of Example 1, Example 2, Example 3, and Example 4 were 9.18, 6.46, 4.45, and 4.02, respectively.

Furthermore, in the case of the optimum H ₂ O ₂ /Fe ⁺² dosing ratio and good treatment efficiency, most suitable DO values fall in the range of 0 or more to 2 mg/L. In addition, in this case, as shown in FIGS. 8A to 8D and 9A to 9D, the COD removal rate and the chromaticity removal rate are also good, and it can be confirmed that when H ₂ O ₂ /Fe ^{+2 is} effectively controlled. When the ratio is compared, the effect of treating wastewater can be effectively achieved.

Therefore, it can be confirmed from the above experimental results that: (1) When the target water (for example, water to be treated WA) is treated by the Fenton reaction system, the monitoring value of DOt is set to be in the range of 0 or more to 2 mg/L. (ie, the set value A is 2 mg/L), the amount of H ₂ O ₂ added can be well controlled (ie, the optimum H ₂ O ₂ /Fe ⁺² dosing ratio), and Fenton can be completed efficiently. Treatment of the reaction system. However, the user may change the value of the set value A as needed, for example, it may be to set the monitored value of DOt to a range of 3 mg/L (ie, the set value A is 3 mg/ L), even values above 3 mg/L, such as 6 mg/L, 10 mg/L, etc. (2) When the Fenton reaction system is used to treat the target water (for example, the water to be treated WA), in addition to the above (1), the monitored value of DOt is set in the range of 0 or more to 2 mg/L (that is, the set value A). In addition to 2 mg/L, it is also possible to additionally detect the initial DOt value in the system (for example, when the DOt value is 0 mg/L, ie, A1 = 0 mg/L) or from the initial value to the set value A. The DOt value in (for example, the value of DOt (ie, A1) is 0, 0.1, 0.5, 1.0, 1.1, 1.5 mg/L, etc.), and the ORPt value corresponding to the same case (for example, ORPt is X), when X If it is less than the set value B1 (ie, the upper limit of the corresponding corresponding ORPt value, for example, B1=545 mV), H ₂ O ₂ is continuously added, and when X is greater than the set value B1, the auxiliary processing mode can be entered (eg, stop adding H) ₂ O ₂ ), so that the Fenton reaction system treatment can be completed efficiently. The value of B1 can be obtained by referring to Table 1. (3) In addition, for the detection of ORPt, in addition to the above-mentioned (2) set value B1 as the upper limit of ORPt, the lower limit of ORPt (ie, set value C1) can be set according to Table 1, when X is greater than the setting When the value C1 (for example, C1=520 mV), H ₂ O ₂ is continuously added. When X is less than the set value C1, the auxiliary processing mode can be entered (for example, H ₂ O _{2 is} stopped), so that the efficiency can be obtained efficiently. Complete Fenton reaction system processing. The value of C1 can be obtained by referring to Table 1. (4) In addition, in addition to applying the Fenton reaction system to treat the target water (for example, the water to be treated WA) as in the above (1), (2) or (3), the H ₂ in the system may be additionally detected. O ₂ /Fe ⁺² dosing ratio (for example, the detected dosing ratio is represented by Y), when Y is greater than the target dosing ratio (for example, 4.45, please refer to Table 1), Fe ^{+2 is} added to the Fenton reaction. Within the system. When Y is less than the target dosing ratio, H ₂ O _{2 is added} to the Fenton reaction system. When Y is equal to the target dosing ratio, the addition of the oxidant and the catalyst is stopped. In this way, the addition amount of H ₂ O ₂ can be well controlled (i.e., the optimum H ₂ O ₂ /Fe ⁺² dosing ratio), and the treatment of the Fenton reaction system can be performed efficiently. However, the user can change the target dosing ratio according to actual needs. For example, it may be that the target dosing ratio is set to a value of 6.46, 9.18, and the like.

In addition, in practice, due to the inevitable error in instrument monitoring or calculation, it can be regarded as a tolerance (for example, 1%) when the above-mentioned upper or lower limit or the target dosing amount is used to judge certain conditions. , 5%, etc.) Whether the condition is met.

Further, the results of the above Examples 1-4 can be further extended to various waters to be treated. For example, for some water to be treated, the parameters as in Table 1 can be found in accordance with Examples 1-4, thereby treating the water to be treated with any of the foregoing embodiments. However, the implementation of the present invention is not limited thereto.

In summary, for a certain water to be treated, by monitoring the DO value at least for the desired set value A, it is possible to obtain an individual optimum H ₂ O ₂ dosing amount or H under the specific conditions. ₂ O ₂ /Fe ⁺² dosing ratio. In addition, when the ORP value can be monitored, or the H ₂ O ₂ /Fe ⁺² dosing ratio, the Fe ⁺² concentration, and the residual H ₂ O ₂ concentration can be further monitored, thereby obtaining the conditions under the conditions. Individual optimum H ₂ O ₂ dosing or H ₂ O ₂ /Fe ⁺² dosing ratio.

However, the above is only an embodiment of the present invention, but the scope of the present invention is of course not limited thereto. It should be understood by those skilled in the art that the present invention can be easily modified and modified without departing from the spirit and scope of the invention. Within the scope. In addition, any of the embodiments or the claims of the present invention are not required to include all of the objects or advantages or features disclosed in the specification. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

1‧‧‧Waste treatment system
10‧‧‧Fenton Reaction System Control Unit
11‧‧‧Dissolved oxygen sensing device
12‧‧‧Oxidation reduction potential sensing device
13‧‧‧Local Control Unit
20‧‧‧Fenton reaction tank
30‧‧‧Drug Addition Unit
31‧‧‧ pump
40‧‧‧Processing tank
50‧‧‧Remote control unit
60‧‧‧ Terminal devices
70‧‧‧Fenton Reaction System Control Unit
71‧‧‧Reaction tank
72‧‧‧pH sensing device
73‧‧‧ORP sensing device
74‧‧‧DO sensing device
75‧‧‧Control unit
76‧‧‧Conductivity sensing device
77‧‧‧Power supply
78‧‧‧Oxidant pump
79‧‧‧ catalyst pump
80‧‧‧pending water pump
111‧‧‧Data processing device
112‧‧‧Storage device
113‧‧‧Communication device
SC1, SC2‧‧‧ Dosing control signals
LK‧‧‧Communication Link
S10, S20, S25‧‧‧ steps
S30, S40, S50‧‧‧ steps
S55, S57, S59‧‧‧ steps
S65, S67, S69‧ ‧ steps

1 shows a flow chart of a Fenton reaction system control method in accordance with an embodiment of the present invention. 2 is a flow chart showing a method of controlling a Fenton reaction system in accordance with another embodiment of the present invention. 3 is a flow chart showing a method of controlling a Fenton reaction system in accordance with another embodiment of the present invention. 4 is a schematic block diagram showing the use of a Fenton reaction system control apparatus in accordance with an embodiment of the present invention in a wastewater treatment system. Figure 5 is a schematic block diagram showing another embodiment of the Fenton reaction system control apparatus in accordance with the present invention. Figure 6 shows a schematic block diagram of other embodiments of a wastewater treatment system. Fig. 7 is a view showing an embodiment in which the Fenton reaction system control apparatus according to the present invention is used to carry out an experiment. 8A to 8D are graphs showing changes in COD removal rate of Examples 1 to 4 of the present invention. 9A to 9D are graphs showing changes in chromaticity removal rate of Embodiments 1 to 4 of the present invention. 10A to 10D are graphs showing changes in residual hydrogen peroxide concentration in Examples 1 to 4 of the present invention. 11A to 11D are graphs showing changes in ferrous residual concentration of Examples 1 to 4 of the present invention. 12A to 12D are graphs showing changes in the H2O2/Fe ⁺² dosing ratio of Examples 1 to 4 of the present invention.

S10, S20, S25, S30, S40‧‧‧ steps

Claims (15)

A Fenton reaction system control method comprising: monitoring a dissolved oxygen (DO) concentration in a Fenton reaction system and obtaining a DO concentration value (DOt); adding a catalyst to the Fenton reaction system, wherein the Fenton reaction The system contains water to be treated; when the DOt is equal to 0 or less than the set value A, an oxidant is added or generated in the Fenton reaction system; when the DOt is equal to or greater than the set value A, the addition or stop of the generation is stopped. An oxidizing agent; wherein the oxidizing agent comprises at least hydrogen peroxide, the set value A is greater than 0, and the initial value of the DOt is less than A. The method of claim 1, wherein the set value A is 1.0 mg/L or more. The method of claim 1, further comprising: monitoring an oxidation-reduction potential (ORP) in the Fenton reaction system and obtaining an ORP value (ORPt); and when the DOt is A1 and the ORPt system is less than the DOt is A1 When the set value B1 corresponding to the time is set, the oxidant is added or generated in the Fenton reaction system; when the DOt is A1 and the ORPt is equal to or greater than the set value B1, the addition or stop of generating the oxidant is stopped, wherein A>A130. The method of claim 1, further comprising: monitoring an oxidation-reduction potential (ORP) in the Fenton reaction system and obtaining an ORP value (ORPt); and when the DOt is A1, the ORPt is less than the DOt is A1 When the corresponding set value B1 and the ORPt is greater than or equal to the set value C1 corresponding to the DOt being A1, the oxidant is added or generated in the Fenton reaction system; when the DOt is A1 and the ORPt When it is equal to or greater than the set value B1 or the ORPt is less than the set value C1, the addition or stop of generating the oxidant is stopped, wherein A>A130, B1>C1. The method of claim 1, further comprising: monitoring the oxidizing agent and the dosing amount of the catalyst; and adding the catalyst to the Fenton when the ratio of the oxidizing agent to the catalyst is greater than a dosing ratio; In the reaction system; when the ratio of the oxidant to the catalyst is less than the dosing ratio, the oxidant is added or produced in the Fenton reaction system; and when the ratio of the oxidant to the catalyst is equal to At the dosing ratio, the addition or stop of the generation of the oxidant is stopped, and the addition of the catalyst is stopped. The method of claim 1, wherein the catalyst is ferrous iron. The method of any one of claims 1 to 6, wherein the Fenton reaction system is a conventional Fenton reaction system, an electrolytic reduction-Fenton reaction system, a fluidized bed-Fenton reaction system, or a photo-Fenton reaction system. A Fenton reaction system control device comprising: a dissolved oxygen sensing device for monitoring the dissolved oxygen (DO) in a Fenton reaction tank to obtain a DO concentration value (DOt); and a local control a unit that emits a control signal C1 according to at least DOt to add or generate an oxidant in the Fenton reaction tank, wherein when DOt is equal to 0 or less than the set value A, an oxidant is added or generated in the Fenton reaction system, when DOt is When it is equal to or greater than the set value A, the addition or stop of generating the oxidant is stopped, the set value A is greater than 0, and the initial value of the DOt is less than A. The control device of claim 8, further comprising: a redox potential sensing device for monitoring an oxidation-reduction potential ORP in the Fenton reaction tank to obtain an ORP value (ORPt); wherein the local control unit is further based The control signal SC1 is sent by the DOt and the ORPt to add the oxidant to the Fenton reaction tank. When the DOt is A1 and the ORPt is less than the set value B1 corresponding to the DOt being A1, the local control unit sends the control signal SC1. To add or generate the oxidant in the Fenton reaction system, when DOt is A1 and ORPt is equal to or greater than the set value B1, then the local control unit stops adding or stops producing the oxidant, wherein A>A130. The control device of claim 8, further comprising: a redox potential sensing device for monitoring an oxidation-reduction potential ORP in the Fenton reaction tank to obtain an ORP value (ORPt); wherein the local control unit is further based DOt and ORPt send the control signal SC1 to add the oxidant to the Fenton reaction tank, wherein when DOt is A1, ORPt is less than DOt is A1 corresponding set value B1, and ORPt is greater than or equal to DOt is A1 When the set value C1 corresponding to the time, the local control unit sends the control signal SC1 to add or generate the oxidant in the Fenton reaction system; when DOt is A1 and ORPt is equal to or greater than the set value B1 or ORPt is less than When the value C1 is set, the local control unit stops adding or stopping the generation of the oxidant, where A>A130, B1>C1. The control device of claim 8, wherein the local control unit monitors the oxidant and the dosing amount of the catalyst; and when the ratio of the oxidant to the catalyst is greater than a dosing ratio, the local control unit Sending a control signal SC2 to add the catalyst to the Fenton reaction system; when the ratio of the oxidant to the catalyst is less than the dosing ratio, the local control unit sends the control signal SC1 to add or generate the oxidant In the Fenton reaction system; when the ratio of the oxidant to the catalyst is the dosing ratio, the local control unit stops adding or stopping the production of the oxidant, and stops adding the catalyst. The control device of claim 8, wherein the local control unit comprises: a data processing device that collects a plurality of values relating to control parameters of the Fenton reaction tank, the plurality of control parameters including at least DOt; a storage device, For communication with the data processing device; and a communication device for communicating the data processing device with the outside, wherein the communication device transmits the at least partially collected value to the outside via a communication link. The control device of claim 12, further comprising: a remote control unit that instructs the local control unit to emit at least the control signal SC1 to add the oxidant to the Fenton reaction tank according to the plurality of control parameters. The control device of claim 8, wherein the Fenton reaction tank is a conventional Fenton reaction tank, an electrolytic reduction-Fenton reaction tank, a fluidized bed-Fenton reaction tank, or a light-Fenton reaction tank. A wastewater treatment system comprising: a Fenton reaction tank for treating water to be treated by a Fenton method; a Fenton reaction system control device as claimed in any one of claims 14 to 23; The unit is added and the dosing control signal is returned to selectively add at least the oxidant to the Fenton reaction tank.