A formaldehyde wastewater treatment parameter adjustment system based on Fenton catalytic oxidation method and its application

Abstract

The present invention belongs to the field of environmental protection, and in particular to a formaldehyde wastewater treatment parameter allocation system based on Fenton catalytic oxidation method and its application. The system provided by the present invention includes: a hydrogen peroxide agent tank, a ferrous sulfate solution agent tank, a formaldehyde wastewater tank, a first temperature-controlled liquid material tank, a second temperature-controlled liquid material tank, a Fenton reactor, a temperature control device, a flow control device, a formaldehyde concentration online monitoring device, and a pH value online monitoring device. In the present invention, by adjusting the parameter conditions when the system is running, the real-time influence of parameter conditions such as hydrogen peroxide concentration, ferrous sulfate solution concentration, reaction pH value, reaction time, reaction temperature, etc. on the formaldehyde removal efficiency during the dynamic reaction process of Fenton catalytic oxidation method for treating formaldehyde wastewater can be studied, so as to quickly and accurately know the most suitable parameter conditions for Fenton catalytic oxidation method for treating formaldehyde wastewater, and provide technical guidance for the practical engineering application of Fenton catalytic oxidation technology.

Description

Technical Field

[0001] The invention belongs to the field of environmental protection, and in particular relates to a formaldehyde wastewater treatment parameter adjustment system based on a Fenton catalytic oxidation method and an application thereof. Background Art

[0002] Formaldehyde is a colorless gas with a strong pungent odor. It is easily soluble in water and can coagulate proteins. It is highly toxic to humans and warm-blooded animals and affects human immune function. It has been identified as a carcinogenic and teratogenic substance by the World Health Organization. Formaldehyde wastewater often contains substances such as alcohol, benzene, and phenols. When the formaldehyde concentration is low, it will inhibit the growth and reproduction of microorganisms. When the concentration is high, it will denature proteins and make it difficult for microorganisms to survive. Therefore, formaldehyde wastewater is difficult to degrade by microorganisms. At present, the treatment methods of formaldehyde wastewater are mainly chemical methods, including condensation, coagulation, oxidation, stripping and lime methods, among which oxidation methods include Fenton reagent oxidation, chlorine dioxide oxidation, wet oxidation, etc. Considering the degradation rate and harmlessness, Fenton catalytic oxidation is an effective method for removing formaldehyde wastewater, especially high-concentration formaldehyde wastewater.

[0003] Fenton's reagent is a 2 O 2 and Fe 2+ It is a strong oxidant composed of OH radicals, which mainly utilizes highly active OH radicals to oxidize and degrade organic matter in wastewater, achieving complete degradation of organic matter in a short time. However, the reaction system of Fenton reagent is very complex, and the final decomposition product is H 2 O, O 2 and Fe 3+ , a large number of particles continue to settle before and after the reaction, the transparency of the solution is not high, H 2 O 2 Concentration, FeSO 4 Concentration, pH value, reaction time and reaction temperature will affect the removal efficiency of Fenton catalytic oxidation method.

[0004] The literature "Fenton Oxidation Method for Deep Treatment of Formaldehyde Wastewater" and "Fenton Oxidation-Biological Contact Oxidation Process for Treatment of Formaldehyde and Hexamine Wastewater" both use manual methods, directly adding water samples and Fenton reagents to a temporary beaker or conical flask for reaction, letting the reaction stand after the supernatant is taken, treating the supernatant, and using spectrophotometry to determine the formaldehyde content in the water sample after adding the reagent. However, this traditional method has the following problems in systematically exploring the selection of reagent ratios for formaldehyde wastewater treatment:

[0005] 1) It is impossible to accurately study H 2 O 2 and FeSO 4The influence of concentration, pH value, reaction temperature and reaction time on removal efficiency. Chemical reaction is a dynamic process. Reagents are added to a beaker or conical flask at one time. As the reaction proceeds, the concentration, pH value and temperature of each reagent change in real time. It is impossible to accurately know the removal efficiency corresponding to a certain reagent concentration, pH value and temperature. In actual projects, the amount of reagents used directly affects the operating costs; the pH value and temperature of the reaction process have a decisive influence on the removal efficiency; the reaction time directly affects the investment cost and operating cost of the project. If the impact of each influencing factor on the efficiency cannot be accurately known, it is impossible to effectively guide the application of actual projects.

[0006] 2) Large errors, large human interference, low automation, and low efficiency affect the accuracy and applicability of the research. The conventional research method is to conduct experiments manually, including manually adding reagents, manually terminating the experiment, and manually sampling to test the formaldehyde content. The human influence factor is large, resulting in poor repeatability of the experiment. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a formaldehyde wastewater treatment parameter adjustment system based on the Fenton catalytic oxidation method and its application. The system provided by the present invention can be used to study the real-time influence of parameter conditions such as hydrogen peroxide concentration, ferrous sulfate solution concentration, reaction pH value, reaction time, reaction temperature, etc. on the formaldehyde removal efficiency during the dynamic reaction process of treating formaldehyde wastewater by the Fenton catalytic oxidation method, so as to screen out the most suitable formaldehyde wastewater treatment parameters; the system has a high degree of automation, is convenient and fast, and has good stability and accuracy.

[0008] The present invention provides a formaldehyde wastewater treatment parameter adjustment system based on Fenton catalytic oxidation method, comprising:

[0009] Hydrogen peroxide tank, ferrous sulfate solution tank, formaldehyde wastewater tank;

[0010] A first temperature-controlled liquid material tank connected to the liquid outlet of the hydrogen peroxide tank, wherein a hydrogen peroxide tank liquid outlet metering pump is provided on the connecting pipeline;

[0011] A second temperature-controlled liquid material tank connected to the liquid outlet of the ferrous sulfate solution tank and the liquid outlet of the formaldehyde wastewater tank, respectively; a ferrous sulfate solution tank liquid outlet metering pump is provided on the connecting pipeline between the liquid outlet of the ferrous sulfate solution tank and the second temperature-controlled liquid material tank; a formaldehyde wastewater tank liquid outlet metering pump is provided on the connecting pipeline between the liquid outlet of the formaldehyde wastewater tank and the second temperature-controlled liquid material tank;

[0012] A Fenton reactor connected to the liquid outlet of the first temperature-controlled liquid tank and the liquid outlet of the second temperature-controlled liquid tank, respectively, wherein a first temperature-controlled liquid tank liquid outlet metering pump is provided on the connecting pipe between the liquid outlet of the first temperature-controlled liquid tank and the Fenton reactor, and a second temperature-controlled liquid tank liquid outlet metering pump is provided on the connecting pipe between the liquid outlet of the second temperature-controlled liquid tank and the Fenton reactor;

[0013] A temperature control device for regulating the temperature of the first temperature-controlled liquid material tank, the second temperature-controlled liquid material tank and the Fenton reactor;

[0014] A flow control device for regulating the flow of the hydrogen peroxide tank outlet metering pump, the ferrous sulfate solution tank outlet metering pump, the formaldehyde wastewater tank outlet metering pump, the first temperature-controlled liquid material tank outlet metering pump, and the second temperature-controlled liquid material tank outlet metering pump;

[0015] A formaldehyde concentration online monitoring device for monitoring the formaldehyde concentration at the liquid outlet of the formaldehyde wastewater tank and the liquid outlet of the Fenton reactor;

[0016] An online pH monitoring device for monitoring the pH value at the outlet of the formaldehyde wastewater tank and the outlet of the Fenton reactor.

[0017] Preferably, the Fenton reactor is provided with a plurality of liquid outlets along its height direction, and each liquid outlet is equipped with a valve.

[0018] Preferably, the multiple liquid outlets are arranged spirally along the height direction of the Fenton reactor.

[0019] Preferably, a waste liquid storage tank is further included, and the liquid inlet of the waste liquid storage tank is connected to the liquid outlet of the Fenton reactor.

[0020] Preferably, a stirring device is provided in the Fenton reactor.

[0021] Preferably, the Fenton reactor is provided with a scale along its height direction.

[0022] Preferably, a stirring device is provided in the first temperature-controlled liquid material tank; and a stirring device is provided in the second temperature-controlled liquid material tank.

[0023] Preferably, the first temperature-controlled liquid material tank is provided with a scale along its height direction; and the second temperature-controlled liquid material tank is provided with a scale along its height direction.

[0024] Preferably, the hydrogen peroxide tank is provided with a scale along its height direction; the ferrous sulfate solution tank is provided with a scale along its height direction; and the formaldehyde wastewater tank is provided with a scale along its height direction.

[0025] The present invention provides a method for adjusting formaldehyde wastewater treatment parameters based on Fenton catalytic oxidation method, comprising the following steps:

[0026] The formaldehyde wastewater is treated in the formaldehyde wastewater treatment parameter adjustment system described in the above technical solution, and the parameter conditions during the treatment are adjusted to obtain the formaldehyde removal efficiency under the corresponding parameter conditions.

[0027] Compared with the prior art, the present invention provides a formaldehyde wastewater treatment parameter adjustment system based on Fenton catalytic oxidation method and its application. The system provided by the present invention includes: a hydrogen peroxide tank, a ferrous sulfate solution tank, and a formaldehyde wastewater tank; a first temperature-controlled liquid tank connected to the liquid outlet of the hydrogen peroxide tank, and a hydrogen peroxide tank outlet metering pump is arranged on its connecting pipe; a second temperature-controlled liquid tank connected to the liquid outlet of the ferrous sulfate solution tank and the liquid outlet of the formaldehyde wastewater tank, respectively, and a ferrous sulfate solution tank outlet metering pump is arranged on the connecting pipe between the liquid outlet of the ferrous sulfate solution tank and the second temperature-controlled liquid tank, and a formaldehyde wastewater tank outlet metering pump is arranged on the connecting pipe between the liquid outlet of the formaldehyde wastewater tank and the second temperature-controlled liquid tank; a Fenton reactor connected to the liquid outlet of the first temperature-controlled liquid tank and the liquid outlet of the second temperature-controlled liquid tank, respectively, and the liquid outlet of the first temperature-controlled liquid tank is connected to the liquid outlet of the second temperature-controlled liquid tank. A first temperature-controlled liquid tank outlet metering pump is arranged on the connecting pipeline of the Fenton reactor, and a second temperature-controlled liquid tank outlet metering pump is arranged on the connecting pipeline between the liquid outlet of the second temperature-controlled liquid tank and the Fenton reactor; a temperature control device for regulating the temperature of the first temperature-controlled liquid tank, the second temperature-controlled liquid tank and the Fenton reactor; a flow control device for regulating the flow of the hydrogen peroxide tank outlet metering pump, the ferrous sulfate solution tank outlet metering pump, the formaldehyde wastewater tank outlet metering pump, the first temperature-controlled liquid tank outlet metering pump and the second temperature-controlled liquid tank outlet metering pump; a formaldehyde concentration online monitoring device for monitoring the formaldehyde concentration at the formaldehyde wastewater tank outlet and the Fenton reactor outlet; a pH value online monitoring device for monitoring the pH value at the formaldehyde wastewater tank outlet and the Fenton reactor outlet. In the present invention, by adjusting the parameter conditions during system operation, the real-time influence of parameter conditions such as hydrogen peroxide concentration, ferrous sulfate solution concentration, reaction pH value, reaction time, reaction temperature, etc. on the formaldehyde removal efficiency in the dynamic reaction process of treating formaldehyde wastewater by Fenton catalytic oxidation method can be studied, so as to quickly and accurately know the most suitable parameter conditions for treating formaldehyde wastewater by Fenton catalytic oxidation method, and provide technical guidance for the practical engineering application of Fenton catalytic oxidation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of a formaldehyde wastewater treatment parameter adjustment system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a formaldehyde wastewater treatment parameter adjustment system based on Fenton catalytic oxidation method, comprising:

[0032] Hydrogen peroxide tank, ferrous sulfate solution tank, formaldehyde wastewater tank;

[0033] A first temperature-controlled liquid material tank connected to the liquid outlet of the hydrogen peroxide tank, wherein a hydrogen peroxide tank liquid outlet metering pump is provided on the connecting pipeline;

[0034] A second temperature-controlled liquid material tank connected to the liquid outlet of the ferrous sulfate solution tank and the liquid outlet of the formaldehyde wastewater tank, respectively; a ferrous sulfate solution tank liquid outlet metering pump is provided on the connecting pipeline between the liquid outlet of the ferrous sulfate solution tank and the second temperature-controlled liquid material tank; a formaldehyde wastewater tank liquid outlet metering pump is provided on the connecting pipeline between the liquid outlet of the formaldehyde wastewater tank and the second temperature-controlled liquid material tank;

[0035] A Fenton reactor connected to the liquid outlet of the first temperature-controlled liquid tank and the liquid outlet of the second temperature-controlled liquid tank, respectively, wherein a first temperature-controlled liquid tank liquid outlet metering pump is provided on the connecting pipe between the liquid outlet of the first temperature-controlled liquid tank and the Fenton reactor, and a second temperature-controlled liquid tank liquid outlet metering pump is provided on the connecting pipe between the liquid outlet of the second temperature-controlled liquid tank and the Fenton reactor;

[0036] A temperature control device for regulating the temperature of the first temperature-controlled liquid material tank, the second temperature-controlled liquid material tank and the Fenton reactor;

[0037] A flow control device for regulating the flow of the hydrogen peroxide tank outlet metering pump, the ferrous sulfate solution tank outlet metering pump, the formaldehyde wastewater tank outlet metering pump, the first temperature-controlled liquid material tank outlet metering pump, and the second temperature-controlled liquid material tank outlet metering pump;

[0038] A formaldehyde concentration online monitoring device for monitoring the formaldehyde concentration at the liquid outlet of the formaldehyde wastewater tank and the liquid outlet of the Fenton reactor;

[0039] An online pH monitoring device for monitoring the pH value at the outlet of the formaldehyde wastewater tank and the outlet of the Fenton reactor.

[0040] See also Figure 1 , Figure 1 1-1 is a hydrogen peroxide tank, 1-2 is a ferrous sulfate solution tank, 1-3 is a formaldehyde wastewater tank, 2-1 is a first temperature-controlled liquid tank, 2-2 is a second temperature-controlled liquid tank, 3 is a Fenton reactor, 4 is a waste liquid storage tank, 5-1 is a hydrogen peroxide tank outlet metering pump, 5-2 is a ferrous sulfate solution tank outlet metering pump, 5-3 is a formaldehyde wastewater tank outlet metering pump, 5-4 is a first temperature-controlled liquid tank outlet metering pump, 5-5 is a second temperature-controlled liquid tank outlet metering pump, 6 is a temperature and flow control device, 7 is a formaldehyde concentration online monitoring device, 8 is a pH value online monitoring device, and 9 is a waste liquid discharge pipeline.

[0041] The formaldehyde wastewater treatment parameter adjustment system provided by the present invention comprises: a hydrogen peroxide agent tank (1-1), a ferrous sulfate solution agent tank (1-2), a formaldehyde wastewater tank (1-3), a first temperature-controlled liquid material tank (2-1), a second temperature-controlled liquid material tank (2-2), a Fenton reactor (3), a temperature control device, a flow control device, a formaldehyde concentration online monitoring device (7) and a pH value online monitoring device (8).

[0042] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the hydrogen peroxide tank (1-1) is used to contain hydrogen peroxide; the hydrogen peroxide tank (1-1) is preferably provided with a scale along its height direction; the hydrogen peroxide tank (1-1) is preferably provided with a sealing cover to prevent the volatilization of the contents; the material of the hydrogen peroxide tank (1-1) is preferably acid-resistant, alkali-resistant and corrosion-resistant polytetrafluoroethylene material.

[0043] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the ferrous sulfate solution tank (1-2) is used to contain the ferrous sulfate solution; the ferrous sulfate solution tank (1-2) is preferably provided with a scale along its height direction; the ferrous sulfate solution tank (1-2) is preferably provided with a sealing cover to prevent the volatilization of the contents; the material of the ferrous sulfate solution tank (1-2) is preferably acid-resistant, alkali-resistant and corrosion-resistant polytetrafluoroethylene material.

[0044] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the formaldehyde wastewater tank (1-3) is used to contain formaldehyde wastewater; the formaldehyde wastewater tank (1-3) is preferably provided with a scale along its height direction; the formaldehyde wastewater tank (1-3) is preferably provided with a sealing cover to prevent the volatilization of the contents; the material of the formaldehyde wastewater tank (1-3) is preferably acid-resistant, alkali-resistant and corrosion-resistant polytetrafluoroethylene material.

[0045] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the liquid inlet of the first temperature-controlled liquid material tank (2-1) is connected to the liquid outlet of the hydrogen peroxide agent tank (1-1), and a hydrogen peroxide agent tank (1-1) liquid outlet metering pump (5-1) is provided on the connecting pipe. In the present invention, the first temperature-controlled liquid material tank (2-1) has heating and heat preservation functions, which is used to preheat the hydrogen peroxide, thereby reducing the temperature fluctuation caused by the subsequent entry of the hydrogen peroxide into the Fenton reactor (3), and then accurately studying the effect of the reaction temperature on the formaldehyde removal efficiency. In the present invention, a stirring device is preferably provided in the first temperature-controlled liquid material tank (2-1); the material of the first temperature-controlled liquid material tank (2-1) is preferably acid-resistant, alkali-resistant, and corrosion-resistant polytetrafluoroethylene material.

[0046] In the formaldehyde wastewater treatment parameter allocation system provided by the present invention, the liquid inlet of the second temperature-controlled liquid material tank (2-2) is connected with the liquid outlet of the ferrous sulfate solution medicine tank (1-2) and the liquid outlet of the formaldehyde wastewater tank (1-3) respectively, wherein, the connecting pipeline between the second temperature-controlled liquid material tank (2-2) and the ferrous sulfate solution medicine tank (1-2) is provided with a ferrous sulfate solution medicine tank liquid outlet metering pump (5-2), and the connecting pipeline between the second temperature-controlled liquid material tank (2-2) and the formaldehyde wastewater tank (1-3) is provided with a formaldehyde wastewater tank liquid outlet metering pump (5-3). In the present invention, the second temperature-controlled liquid material tank (2-2) has heating and heat preservation functions, and is used for premixing and preheating ferrous sulfate solution and formaldehyde wastewater. By preheating, the temperature fluctuation caused by the subsequent entry of the mixed solution of ferrous sulfate solution and formaldehyde wastewater into the Fenton reactor (3) can be reduced, and then the influence of the reaction temperature on the formaldehyde removal efficiency can be accurately studied. In the present invention, a stirring device is preferably provided in the second temperature-controlled liquid material tank (2-2); the material of the second temperature-controlled liquid material tank (2-2) is preferably acid-resistant, alkali-resistant and corrosion-resistant polytetrafluoroethylene material.

[0047] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the Fenton reactor (3) is used as a reactor for reacting formaldehyde wastewater with FeSO 4 and H 2 O 2The place of reaction has heating and heat preservation functions, and its liquid inlet is respectively connected with the liquid outlet of the first temperature-controlled liquid material tank (2-1) and the liquid outlet of the second temperature-controlled liquid material tank (2-2), wherein the connecting pipeline between the Fenton reactor (3) and the first temperature-controlled liquid material tank (2-1) is provided with a first temperature-controlled liquid material tank liquid outlet metering pump (5-4), and the connecting pipeline between the Fenton reactor (3) and the second temperature-controlled liquid material tank (2-2) is provided with a second temperature-controlled liquid material tank liquid outlet metering pump (5-5). In the present invention, the Fenton reactor (3) is preferably provided with a plurality of liquid outlets along its height direction, and each liquid outlet is equipped with a valve; since the time required for the liquid level to reach the liquid outlets at different positions during the reaction is different, that is, the reaction time is different, the reaction time can be controlled by controlling the opening and closing of the valves of the liquid outlets at different positions, thereby studying the influence of different reaction times on the formaldehyde removal efficiency. In the present invention, the plurality of liquid outlets on the Fenton reactor (3) are preferably arranged in a spiral along the height direction of the Fenton reactor (3); such a design can avoid interference between valves during operation, facilitate operation, and help to discharge the liquid in a timely manner. In the present invention, a stirring device is preferably provided in the Fenton reactor (3); the material of the Fenton reactor (3) is preferably acid-resistant, alkali-resistant, and corrosion-resistant polytetrafluoroethylene material.

[0048] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the temperature control device is used to control the temperature of the first temperature-controlled liquid material tank (2-1), the second temperature-controlled liquid material tank (2-2) and the Fenton reactor (3). In the present invention, by using the temperature control device, the influence of different reaction temperatures on the formaldehyde removal efficiency can be studied.

[0049] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the flow control device is used to control the flow of the liquid metering pump (5-1) of the hydrogen peroxide agent tank (1-1), the liquid metering pump (5-2) of the ferrous sulfate solution agent tank (1-2), the liquid metering pump (5-3) of the formaldehyde wastewater tank (1-3), the liquid metering pump (5-4) of the first temperature-controlled liquid material tank (2-1) and the liquid metering pump (5-5) of the second temperature-controlled liquid material tank (2-2). In the present invention, by using the flow control device, the influence of different agent ratios and dosages on the formaldehyde removal efficiency can be studied.

[0050] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the temperature control device and the flow control device are preferably integrated together, that is, Figure 1 The temperature and flow control device (6) shown.

[0051] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the formaldehyde concentration online monitoring device (7) is used to monitor the formaldehyde concentration at the liquid outlet of the formaldehyde wastewater tank (1-3) and the liquid outlet of the Fenton reactor (3), so as to calculate the formaldehyde removal efficiency. In the present invention, the formaldehyde detection method adopted by the formaldehyde concentration online monitoring device (7) is preferably ultraviolet spectrophotometry.

[0052] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the pH value online monitoring device (8) is used to monitor the pH value of the liquid outlet of the formaldehyde wastewater tank (1-3) and the liquid outlet of the Fenton reactor (3), so as to study the influence of different reaction pH values ​​on the formaldehyde removal efficiency.

[0053] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, it is preferred to further include a waste liquid storage tank (4), the liquid inlet of the waste liquid storage tank (4) is connected to the liquid outlet of the Fenton reactor (3), and is used to hold the liquid after the Fenton reaction, and then uniformly treat and discharge it to avoid polluting the environment. In the present invention, the liquid outlet of the waste liquid storage tank (4) is preferably connected to a waste liquid discharge pipeline (9); in the present invention, the material of the waste liquid storage tank (4) is preferably acid-resistant, alkali-resistant, and corrosion-resistant polytetrafluoroethylene material.

[0054] In the formaldehyde wastewater treatment parameter adjustment system provided by the present invention, the connecting pipelines between the various devices and equipment are preferably acid-resistant, alkali-resistant and corrosion-resistant polytetrafluoroethylene pipes.

[0055] The present invention also provides a method for adjusting formaldehyde wastewater treatment parameters based on the Fenton catalytic oxidation method, comprising the following steps:

[0056] The formaldehyde wastewater is treated in the formaldehyde wastewater treatment parameter adjustment system described in the above technical solution, and the parameter conditions during the treatment are adjusted to obtain the formaldehyde removal efficiency under the corresponding parameter conditions.

[0057] The technical solution provided by the present invention can study the real-time effects of parameters such as hydrogen peroxide concentration, ferrous sulfate solution concentration, reaction pH value, reaction time, reaction temperature, etc. on the formaldehyde removal efficiency during the dynamic reaction process of treating formaldehyde wastewater by the Fenton catalytic oxidation method, so as to quickly and accurately know the most suitable parameters for treating formaldehyde wastewater by the Fenton catalytic oxidation method, and provide guidance for the practical engineering application of the Fenton catalytic oxidation technology. More specifically, the technical solution provided by the present invention has the following advantages:

[0058] 1) The effect of different reagents on formaldehyde removal efficiency can be studied by adjusting the concentration and flow rate of the raw materials;

[0059] 2) The influence of different temperatures on formaldehyde removal efficiency can be studied by adjusting the temperature of the liquid tank and the reactor;

[0060] 3) The effect of different reaction times on formaldehyde removal efficiency can be studied by adjusting the residence time of the material in the reactor.

[0061] 4) It has a high degree of automation, is convenient and fast, has good repeatability and reliability, and can quickly determine the appropriate formaldehyde wastewater treatment parameter conditions.

[0062] For the purpose of greater clarity, the invention is described in detail through the following examples.

[0063] Example 1

[0064] like Figure 1 As shown, this embodiment provides a formaldehyde wastewater treatment parameter adjustment system, comprising: a hydrogen peroxide tank (1-1), a ferrous sulfate solution tank (1-2), a formaldehyde wastewater tank (1-3), a first temperature-controlled liquid tank (2-1), a second temperature-controlled liquid tank (2-2), a Fenton reactor (3), a waste liquid storage tank (4), a hydrogen peroxide tank outlet metering pump (5-1), a ferrous sulfate solution tank outlet metering pump (5-2), a formaldehyde wastewater tank outlet metering pump (5-3), a first temperature-controlled liquid tank outlet metering pump (5-4), a second temperature-controlled liquid tank outlet metering pump (5-5), a temperature and flow control device (6), a formaldehyde concentration online monitoring device (7), a pH value online monitoring device (8) and a waste liquid discharge pipeline (9). The specific structure, material selection and connection relationship of each device and equipment have been introduced above and will not be repeated here.

[0065] The system provided in this embodiment can be used to study the process of treating formaldehyde wastewater by Fenton catalytic oxidation. 2 O 2 and FeSO 4 The dosage, pH value, reaction time, reaction temperature and other factors affect the formaldehyde removal efficiency, and the optimal parameter conditions are determined. The specific steps are as follows:

[0066] Prepare a certain concentration of H 2 O 2 Solution and FeSO 4The solutions are respectively loaded into a hydrogen peroxide tank (1-1) and a ferrous sulfate solution tank (1-2), and the formaldehyde wastewater to be treated is loaded into a formaldehyde wastewater tank (1-3); a valve at a certain height of a Fenton reactor (3) is opened, and other valves at the liquid outlets of the Fenton reactor (3) are closed; the temperatures of the first temperature-controlled liquid tank (2-1), the second temperature-controlled liquid tank (2-2) and the Fenton reactor (3) are set, and the temperature control unit of the temperature and flow control device (6) is turned on; the formaldehyde concentration online monitoring device (7) and the pH value online monitoring device (8) are turned on; the stirring devices of the first temperature-controlled liquid tank (2-1), the second temperature-controlled liquid tank (2-2) and the Fenton reactor (3) are turned on; the flow rates of the metering pumps (5-1) to (5-5) are respectively set through the flow control unit of the temperature and flow control device (6), and the Fenton reaction begins; during the reaction, a certain flow rate of FeSO 4 The solution and formaldehyde wastewater enter the second temperature-controlled liquid material tank (2-2), are stirred evenly by the stirring device, and then flow into the Fenton reactor (3); the H in the hydrogen peroxide reagent tank (1-1) 2 O 2 The solution also flows through the first temperature-controlled liquid tank (2-1) at a certain flow rate and then enters the Fenton reactor (3), where it reacts with FeSO 4 and CH 2 O reaction, when the reaction time is a certain period, the liquid level in the Fenton reactor (3) reaches an overflow liquid level at a certain height, and the waste liquid after the reaction overflows into the waste liquid storage tank (4) through the liquid outlet at the corresponding height, and at the same time, the formaldehyde concentration at the liquid outlet of the formaldehyde wastewater tank (1-3) and the liquid outlet of the Fenton reactor (3) is monitored in real time by a formaldehyde concentration online monitoring device (7), and the formaldehyde removal efficiency is calculated;

[0067] In the above steps provided in this embodiment, by preparing different concentrations of H 2 O 2 Solution, FeSO 4 By adjusting the liquid flow rates of the hydrogen peroxide solution tank (1-1), the ferrous sulfate solution tank (1-2) and the formaldehyde wastewater tank (1-3), the influence of different reagent ratios on the formaldehyde wastewater removal efficiency can be studied; by adjusting the temperatures of the first temperature-controlled liquid material tank (2-1), the second temperature-controlled liquid material tank (2-2) and the Fenton reactor (3), the influence of different reaction temperatures on the formaldehyde wastewater removal efficiency can be studied; by adjusting the height of the liquid outlet of the Fenton reactor (3), the influence of different reaction times on the formaldehyde wastewater removal efficiency can be studied; by real-time monitoring of the pH value, the formaldehyde wastewater removal efficiency at different pH values ​​can be determined; and by adjusting the above parameters, the most suitable reagent ratio, pH value, reaction temperature and reaction time in the process of treating formaldehyde wastewater by the Fenton catalytic oxidation method can be quickly and accurately obtained.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for adjusting formaldehyde wastewater treatment parameters based on Fenton catalytic oxidation method, characterized in that: The following steps are involved: Treating the formaldehyde wastewater in a formaldehyde wastewater treatment parameter adjustment system, adjusting the parameter conditions during treatment, and obtaining the formaldehyde removal efficiency under the corresponding parameter conditions; The formaldehyde wastewater treatment parameter adjustment system comprises: A hydrogen peroxide tank, a ferrous sulfate solution tank, and a formaldehyde wastewater tank; the hydrogen peroxide tank is provided with a scale along its height direction; the ferrous sulfate solution tank is provided with a scale along its height direction; the formaldehyde wastewater tank is provided with a scale along its height direction; A first temperature-controlled liquid material tank connected to the liquid outlet of the hydrogen peroxide tank, wherein a hydrogen peroxide tank outlet metering pump is provided on the connecting pipeline; a stirring device is provided in the first temperature-controlled liquid material tank; and a scale is provided along the height direction of the first temperature-controlled liquid material tank; A second temperature-controlled liquid material tank is connected to the liquid outlet of the ferrous sulfate solution tank and the liquid outlet of the formaldehyde wastewater tank respectively, a ferrous sulfate solution tank liquid outlet metering pump is provided on the connecting pipeline between the liquid outlet of the ferrous sulfate solution tank and the second temperature-controlled liquid material tank, and a formaldehyde wastewater tank liquid outlet metering pump is provided on the connecting pipeline between the liquid outlet of the formaldehyde wastewater tank and the second temperature-controlled liquid material tank; a stirring device is provided in the second temperature-controlled liquid material tank; and a scale is provided along the height direction of the second temperature-controlled liquid material tank; A Fenton reactor connected to the liquid outlet of the first temperature-controlled liquid tank and the liquid outlet of the second temperature-controlled liquid tank, respectively; a first temperature-controlled liquid tank liquid outlet metering pump is provided on the connecting pipeline between the liquid outlet of the first temperature-controlled liquid tank and the Fenton reactor, and a second temperature-controlled liquid tank liquid outlet metering pump is provided on the connecting pipeline between the liquid outlet of the second temperature-controlled liquid tank and the Fenton reactor; a stirring device is provided in the Fenton reactor; a scale is provided along the height direction of the Fenton reactor; a plurality of liquid outlets are provided along the height direction of the Fenton reactor, and the plurality of liquid outlets are spirally arranged along the height direction of the Fenton reactor, and each liquid outlet is provided with a valve; A temperature control device for regulating the temperature of the first temperature-controlled liquid material tank, the second temperature-controlled liquid material tank and the Fenton reactor; A flow control device for regulating the flow of the hydrogen peroxide tank outlet metering pump, the ferrous sulfate solution tank outlet metering pump, the formaldehyde wastewater tank outlet metering pump, the first temperature-controlled liquid material tank outlet metering pump, and the second temperature-controlled liquid material tank outlet metering pump; A formaldehyde concentration online monitoring device for monitoring the formaldehyde concentration at the liquid outlet of the formaldehyde wastewater tank and the liquid outlet of the Fenton reactor; An online pH monitoring device for monitoring the pH value at the outlet of the formaldehyde wastewater tank and the outlet of the Fenton reactor.

2. The method for adjusting formaldehyde wastewater treatment parameters according to claim 1, characterized in that: It also includes a waste liquid storage tank, the liquid inlet of which is connected to the liquid outlet of the Fenton reactor.

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