CN117105393A - Waste water treatment device based on photoelectric biological Fenton reaction - Google Patents

Abstract

The present invention provides a wastewater processor based on the photoelectric bio-Fenton reaction, which can generate electricity in situ through electricity-producing microorganisms, reducing dependence on external power sources. While improving conversion efficiency, it can meet the needs of wastewater treatment in multiple scenarios. The immobilized microalgae in the cathode chamber provide free radical oxygen under photosynthesis, promote catalytic reactions and replace the aerator; the pH of the wastewater can be automatically adjusted through the settings of the control unit and drug delivery device, as well as the resistance of the cathode and anode. size, improving wastewater treatment efficiency. Through the application of biology in the electrochemical system, it replaces the use of external energy and instruments, and is environmentally friendly. At the same time, Fe ²⁺ produced during the wastewater treatment process is reduced to Fe ³⁺ in the reaction, and Fe ³⁺ is used in the Fenton reaction Acting as a catalyst for recycling, reducing the generation of iron sludge; the reduction of iron sludge and the recycling of iron ions not only improve the efficiency of the Fenton reaction, but also reduce the need for new iron ions and the consumption of medicines.

Description

A wastewater treatment device based on photoelectric bio-Fenton reaction

Technical field

The present invention relates to the technical field of wastewater treatment devices, and specifically to a wastewater treatment device based on photoelectric bio-Fenton reaction.

Background technique

Oseltamivir is the most commonly used antiviral drug and is widely used in the treatment of influenza A and B. Due to the large-scale use of drugs containing oseltamivir, the concentration of oseltamivir in wastewater has greatly increased. At the same time, oseltamivir can also enter drinking water sources through water circulation, posing potential risks to human health.

Traditional organic wastewater treatment technologies mostly use ordinary air flotation, adsorption, filtration, ozone oxidation, chlorination, micro-electrolysis and other methods. Oseltamivir belongs to a type of organic matter that is difficult to degrade, and the treatment efficiency of these processes is generally low. . Although the existing Fenton reactor can improve treatment efficiency, it has the following shortcomings:

1. Additional power supply and equipment are required to operate the entire reactor, such as aerators, etc.;

2. Iron sludge is continuously generated during the reaction, which greatly reduces the efficiency of the Fenton reaction;

3. The pH value in wastewater cannot be automatically adjusted to improve the efficiency of wastewater treatment.

Contents of the invention

In view of this, the object of the present invention is to provide a wastewater treatment device based on photoelectric bio-Fenton reaction.

The present invention adopts the following solutions:

This application provides a wastewater treatment device based on the photoelectric bio-Fenton reaction, which includes an anode chamber and a cathode chamber, as well as a regulating pool, a control unit and a drug delivery device;

The control unit is used to adjust the resistance of the cathode and anode in the cathode chamber and the anode chamber, and to control the drug delivery device to release drugs into the adjustment pool and the cathode chamber; the adjustment pool is configured as : One-way transportation of waste water to the cathode chamber;

The anode chamber and the cathode chamber are separated by a proton exchange membrane; a carbon brush is used as an anode in the anode chamber, and electricity-producing microorganisms are placed in the anode chamber; graphite rods are used in the cathode chamber as an anode. The cathode, and the surface of the graphite rod is coated with a uniformly stirred mixture of magnetic iron-based composite photocatalyst and conductive glue; immobilized microalgae is placed in the cathode chamber; the anode and the cathode are connected by wires.

Further, the magnetic iron-based composite photocatalyst is composited by a hydrothermal method from magnetic ferroferric oxide, nitrogen-doped titanium dioxide and reduced graphene oxide.

Further, the anode chamber is a sealed chamber.

Further, the drug delivery device stores Na2S2O3, H2SO4 and FeSO4.

Further, a stirrer and a pH meter electrically connected to the control unit are also provided in the regulating tank.

Furthermore, a metering pump electrically connected to the control unit is also provided in the regulating tank.

Further, a valve switch electrically connected to the control unit is provided between the conditioning tank and the cathode chamber, and a one-way valve is provided downstream of the valve switch.

Further, a height difference is formed between the regulating tank and the connecting channel, and the valve switch is placed at the bottom of the regulating tank.

By adopting the above technical solutions, the present invention can achieve the following technical effects:

1. The device can generate electricity in situ through electricity-producing microorganisms, reducing dependence on external power sources. While improving conversion efficiency, it can meet the needs of wastewater treatment in multiple scenarios.

2. The device can automatically adjust the pH of the wastewater through the settings of the control unit and the drug delivery device, as well as adjust the resistance of the cathode and anode, thereby improving the efficiency of wastewater treatment.

3. The device is environmentally friendly. Fe2+ produced during the wastewater treatment process is reduced to Fe3+ in the reaction, and Fe3+ acts as a catalyst in the Fenton reaction for recycling, while reducing the generation of iron sludge.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a wastewater treatment device based on photoelectric bio-Fenton reaction according to an embodiment of the present invention;

Figure 2 is a schematic cross-sectional structural diagram of a wastewater treatment device based on photoelectric bio-Fenton reaction according to an embodiment of the present invention.

Icon: Cathode chamber 1, anode chamber 2, regulating tank 3, control unit 4, drug delivery device 5, cathode 6, anode 7, proton exchange membrane 8, pH meter 9, valve switch 10, stirrer 11.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Accordingly, the following detailed description of embodiments of the invention provided in the appended drawings is not intended to limit the scope of the claimed invention, but rather to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Example

As shown in FIGS. 1 and 2 , this embodiment provides a wastewater treatment device based on the photoelectric bio-Fenton reaction, which includes an anode chamber 2 and a cathode chamber 1 , a regulating pool 3 , a control unit 4 and a drug delivery device. 5;

The control unit 4 is used to adjust the resistance of the cathode 6 and the anode 7 in the cathode chamber 1 and the anode chamber 2, and to control the medicine delivery device 5 to deliver medicine into the adjustment pool 3 and the cathode chamber 1 ; The regulating tank 3 is configured to: transport wastewater in one direction to the cathode chamber 1;

The anode chamber 2 and the cathode chamber 1 are separated by a proton exchange membrane 8; a carbon brush is used as the anode 7 in the anode chamber 2, and electricity-producing microorganisms are placed in the anode chamber 2; A graphite rod is used as the cathode 6 in the cathode chamber 1, and the surface of the graphite rod is coated with a uniformly stirred mixture of magnetic iron-based composite photocatalyst and conductive glue; immobilized microalgae is placed in the cathode chamber 1; so The anode 7 and the cathode 6 are connected through wires.

Specifically, in this embodiment, the magnetic iron-based composite photocatalyst is made of magnetic ferroferric oxide, nitrogen-doped titanium dioxide and reduced graphene oxide through a hydrothermal method. The anode chamber 2 is a sealed chamber to ensure that electricity-producing microorganisms can utilize organic matter in wastewater to generate electrons and H ⁺ in an anaerobic environment. The magnetic iron-based composite photocatalyst catalyzes O ₂ to generate active oxygen under natural light conditions, and the active oxygen reacts with H ⁺ in the anode chamber 2 to generate H ₂ O ₂ while providing oxygen for photocatalysis; while the immobilized microalgae replaced The use of an aerator not only protects microalgae from oxidative damage by active oxygen, but also generates O ₂ ; the drug delivery device 5 stores Na ₂ S ₂ O ₃ , H ₂ SO ₄ and FeSO ₄ . In this embodiment, a valve switch 10 electrically connected to the control unit 4 is provided between the regulating tank 3 and the cathode chamber 1, and a one-way valve is provided downstream of the valve switch 10 (Fig. (not shown in ); there is a height difference between the regulating pool 3 and the connecting channel, and the valve switch 10 is placed at the bottom of the regulating pool 3 so that wastewater can enter the connecting channel through the gravity potential energy. The cathode chamber 1; the regulating tank 3 is also provided with a stirrer 11 and a pH meter 9 that are electrically connected to the control unit 4. Of course, in other embodiments, a metering pump can be added between the regulating tank 3 and the cathode chamber 1 on the basis of the valve switch 10 and the one-way valve, or a separate metering pump can be provided for The wastewater flows to the cathode chamber 1 to provide power, and at the same time, the wastewater is metered to avoid overflowing the cathode chamber 1.

The following details the process of treating wastewater in this device:

Oseltamivir wastewater enters the regulating pool 3 through the water inlet of the regulating pool 3. At this time, the pH meter 9 works to detect the pH value of the wastewater, and controls the drug delivery device 5 to release 0.5 mol/L through the control unit 4. H ₂ SO ₄ adjusts the pH value of the wastewater to about 3, and puts in 0.5 mol/L Na ₂ SO ₄ as the electrolyte for the photobioelectro-Fenton reaction to improve the electrical conductivity of the oseltamivir wastewater; turn on the stirrer 11 Let the above medicines be fully and evenly dissolved in the wastewater, and then open the valve switch 10 to allow the wastewater to flow into the cathode chamber 1 in one direction for Fenton reaction; the magnetic iron-based composite photocatalyst in the cathode chamber 1 catalyzes it under natural light conditions O ₂ generates active oxygen; the electricity-producing microorganisms in the anode 7 use the organic matter in the wastewater to generate electrons and H+ in an oxygen-free environment. The generated electrons are effectively transferred to the electrode, and the H+ enters the cathode chamber 1 through the proton exchange membrane 8; active Oxygen reacts with H+ to generate H ₂ O ₂ while providing oxygen for photocatalysis; the immobilized microalgae not only protects the microalgae from oxidative damage by reactive oxygen species, but also generates O ₂ to promote the catalytic reaction; in the cathode chamber 1 Fe ²⁺ reacts with H ₂ O ₂ to generate ·OH. The generated ·OH has a high redox potential and very strong electron affinity. It can degrade oseltamivir wastewater into small molecule metabolites or directly into carbon dioxide. and water; Fe ²⁺ as consumables. The drug delivery device 5 can deliver FeSO ₄ into the cathode chamber 1 at any time through the control unit 4 to supplement Fe ²⁺ .

It should be noted that the carbon brush in the anode chamber 2 and the graphite rod in the cathode chamber 1 are connected through wires, and the electrons generated by the anode 7 are transmitted to the cathode 6 through the wires to ensure the chemical reaction of the cathode 6; while the cathode 6 and the anode 7 An adjustable resistor can be set between them, and the resistance value is controlled by the control unit 4 to ensure the best Fenton reaction current; at the same time, the shell of the processor can be made of transparent material to ensure the photosynthesis of microalgae.

The present invention provides a wastewater processor based on the photoelectric bio-Fenton reaction, which can generate electricity in situ through electricity-producing microorganisms, reducing dependence on external power sources. While improving conversion efficiency, it can meet the needs of wastewater treatment in multiple scenarios. The immobilized microalgae in the cathode chamber provide free radical oxygen under photosynthesis, promote catalytic reactions, and also replace the aerator; through the settings of the control unit 4 and the drug delivery device 5, the pH of the wastewater can be automatically adjusted, and the cathode 6 can be adjusted and the size of the resistance of the anode 7 improve the efficiency of wastewater treatment. This wastewater processor replaces the use of external energy and instruments through the application of biology in the electrochemical system, and is environmentally friendly. At the same time, Fe ²⁺ produced during the wastewater treatment process is reduced to Fe ³⁺ in the reaction, and Fe ³⁺ is Acting as a catalyst in the Fenton reaction for recycling, reducing the generation of iron sludge; the reduction of iron sludge and the recycling of iron ions not only improve the efficiency of the Fenton reaction, but also reduce the need for new iron ions and the consumption of medicines.

The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. All technical solutions that fall under the idea of the present invention belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The directions indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" etc. or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise expressly provided and limited, the term "above" or "below" a first feature of a second feature may include direct contact between the first and second features, or may also include the first and second features. Not in direct contact but through additional characteristic contact between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

Claims (8)

1. A wastewater treatment device based on photoelectric bio-Fenton reaction, including an anode chamber and a cathode chamber, which is characterized in that: it also includes a regulating tank, a control unit and a drug delivery device; The control unit is used to adjust the resistance of the cathode and anode in the cathode chamber and the anode chamber, and to control the drug delivery device to release drugs into the adjustment pool and the cathode chamber; the adjustment pool is configured as : One-way transportation of waste water to the cathode chamber; The anode chamber and the cathode chamber are separated by a proton exchange membrane; a carbon brush is used as an anode in the anode chamber, and electricity-producing microorganisms are placed in the anode chamber; graphite rods are used in the cathode chamber as an anode. The cathode, and the surface of the graphite rod is coated with a uniformly stirred mixture of magnetic iron-based composite photocatalyst and conductive glue; immobilized microalgae is placed in the cathode chamber; the anode and the cathode are connected by wires. 2. The wastewater treatment device based on photoelectric bio-Fenton reaction according to claim 1, characterized in that the magnetic iron-based composite photocatalyst is composed of magnetic ferroferric oxide, nitrogen-doped titanium dioxide and reduced graphene oxide through water. Produced by thermal compounding. 3. The wastewater treatment device based on photoelectric bio-Fenton reaction according to claim 1, characterized in that the anode chamber is a sealed chamber. 4. The wastewater treatment device based on photoelectric bio-Fenton reaction according to claim 1, characterized in that the drug delivery device stores Na ₂ S ₂ O ₃ , H ₂ SO ₄ and FeSO ₄ . 5. The wastewater treatment device based on photoelectric bio-Fenton reaction according to claim 1, characterized in that a stirrer and a pH meter electrically connected to the control unit are also provided in the regulating tank. 6. The wastewater treatment device based on the photoelectric bio-Fenton reaction according to claim 1, wherein a metering pump electrically connected to the control unit is further provided in the regulating tank. 7. The wastewater treatment device based on photoelectric bio-Fenton reaction according to claim 1, characterized in that a valve switch electrically connected to the control unit is provided between the regulating tank and the cathode chamber. A one-way valve is provided downstream of the valve switch. 8. The wastewater treatment device based on photoelectric bio-Fenton reaction according to claim 7, characterized in that there is a height difference between the regulating tank and the connecting channel, and the valve switch is placed at the bottom of the regulating tank. .