An inner anode enhanced tubular electro-catalytic membrane reactor and application thereof

Abstract

The application provides an inner anode enhanced tubular electro-catalytic membrane reactor and application thereof. The electro-catalytic membrane reactor is composed of an electrolytic cell, a peristaltic pump, a magnetic stirrer, an adjustable direct current stabilized power supply and a three-joint converter. The electrolytic cell is composed of an inner tubular electro-catalytic membrane and an embedded conductive rod as an anode, and an outer tubular electrode as a cathode. One end of the tubular electro-catalytic membrane is closed, and a three-joint converter is added at the other end of the tubular electro-catalytic membrane. The three-joint converter is connected with the peristaltic pump through a hose. The adjustable direct current stabilized power supply provides a constant current. The peristaltic pump realizes the flow of the solution in the reaction process. The magnetic stirrer realizes the formation of a homogeneous solution in the reaction process. The tubular electro-catalytic membrane reactor is simple in design, can fully utilize the inner and outer active areas of the tubular electro-catalytic membrane, improve the wastewater treatment efficiency, and can be used in the treatment processes of printing and dyeing wastewater and reverse osmosis concentrated water of coking wastewater.

Description

Technical Field

[0001] Water scarcity and severe water pollution severely restrict the sustainable development of the economy and society. The development and application of wastewater reuse technology is expected to alleviate the current water environment crisis. The continuous development of new, low-consumption, and high-efficiency wastewater treatment and water resource reuse technologies is of great significance to ecological construction and economic and social development. Background Technology

[0002] Water scarcity and severe water pollution severely restrict the sustainable development of the economy and society. The development and application of wastewater reuse technology is expected to alleviate the current water environment crisis. The continuous development of new, low-consumption, and high-efficiency wastewater treatment and water resource reuse technologies is of great significance to ecological construction and economic and social development.

[0003] Among numerous wastewater reuse technologies, electrocatalytic oxidation has become the dominant technology due to its high efficiency, lack of secondary pollution, and ability to treat organic matter under high salinity conditions. However, it suffers from high energy consumption. Therefore, in recent years, the focus has shifted to removing organic pollutants using electrocatalytic membranes. Tubular electrocatalytic membranes, with their built-in cavities, naturally separate the influent and effluent chambers, resulting in a simple reactor design that facilitates scale-up. While tubular electrocatalytic membranes possess a large active surface area, this area remains largely unutilized. This invention applies an electric field to the inside of the tubular electrocatalytic membrane, stimulating the active surface area and thus efficiently promoting the degradation of organic matter. Summary of the Invention

[0004] In view of this, the present invention aims to propose an internally anode-enhanced tubular electrocatalytic membrane reactor and its application. By utilizing the advantages of the large area and self-contained cavity of the tubular electrocatalytic membrane, a highly efficient electrofiltration system can be formed, which can effectively treat organic matter in wastewater.

[0005] This invention provides a design for an internally anode-enhanced tubular electrocatalytic membrane reactor.

[0006] Another object of the present invention is to provide the application of the aforementioned internally anode-enhanced tubular electrocatalytic membrane reactor.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: a reaction apparatus for an internally anode-enhanced tubular electrocatalytic membrane reactor, comprising an electrolytic cell, a peristaltic pump, a magnetic stirrer, an adjustable DC regulated power supply, a three-connector converter, etc. The electrolytic cell includes a tubular electrocatalytic membrane anode, an inner anode, a reaction feed solution, a tubular cathode, and a rotor.

[0008] Furthermore, the internally anode-enhanced tubular electrocatalytic membrane reactor uses a tubular electrocatalytic membrane as the anode, connected to a three-connector converter and then to the positive terminal of an adjustable DC regulated power supply. Another tubular conductor serves as the cathode, connected to the cathode of the adjustable DC regulated power supply around the outer ring of the anode. An additional wire connects the internal anode to the anode of the adjustable DC regulated power supply. Under a certain current density, the pressure provided by a peristaltic pump forces the reaction feed solution from the electrolytic cell through the tubular cathode and into the interior of the tubular electrocatalytic membrane anode. The three-connector converter connects to the tubular electrocatalytic membrane anode. Due to the pressure applied by the peristaltic pump, the reaction feed solution is drawn out into the pump tube and then flows back to the reactor via the peristaltic pump, achieving efficient removal of organic matter.

[0009] Furthermore, the tubular electrocatalytic membrane anode may have a tubular inorganic metal membrane, an oxide membrane, or a carbon membrane.

[0010] Furthermore, the tubular electrocatalytic membrane anode can be provided with an intermediate layer, and its catalyst layer can be the electrocatalytic membrane itself, or it can be a tubular electrocatalytic membrane loaded with noble metals and oxides, transition metal oxides, etc.

[0011] Furthermore, the tubular cathode can be a metal electrode, such as stainless steel, titanium tube, graphite, etc.

[0012] Furthermore, the internal solid conductive rod can be a titanium rod, a stainless steel rod, or a graphite rod.

[0013] Furthermore, the diameter of the internal solid conductive rod can be 1mm, 2mm, or 3mm.

[0014] Furthermore, the electrolytic cell contains a rotor, which enables the reaction feed liquid to form a homogeneous solution during the circulation process.

[0015] This invention also provides the application of the two types of internally anode-enhanced tubular electrocatalytic membrane reactors described above for the removal of organic matter from reverse osmosis concentrate of dyeing and printing wastewater and reverse osmosis concentrate of coking wastewater. The tubular Ti-NATA / SnO2-Sb electrocatalytic membrane is connected to a DC adjustable DC regulated power supply as the anode, and a stainless steel tube is used as the cathode. A solid conductive rod of 2mm titanium is added inside, which can achieve efficient removal of organic matter in reverse osmosis concentrate.

[0016] Furthermore, the external adjustable DC regulated power supply has a voltage adjustment range of 0–20V and a current adjustment range of 0–5A.

[0017] Furthermore, the distance between the anode and cathode of the electrocatalytic membrane is 1-3 cm.

[0018] Further, the current density is set to 15-25 mA / cm².

[0019] The peristaltic pump speed range is 0-150 rpm.

[0020] Compared to existing technologies, the tubular electrocatalytic membrane reactor described in this invention has the following advantages: To achieve water flow through the tubular electrocatalytic membrane reactor, it is necessary to divide the reactor into an inlet chamber and an outlet chamber. The tubular electrocatalytic membrane reactor has a simple design, with its own chamber, naturally allowing for the separation of the inlet and outlet chambers, facilitating reactor scaling up. Simultaneously, a solid conductive rod is added inside the tubular electrocatalytic membrane to increase the internal electric field, stimulating the active area within the membrane and thus promoting efficient removal of organic matter. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is a schematic diagram of an internally anode-enhanced tubular electrocatalytic membrane reactor.

[0023] Figure 2 The change of organic matter in the reverse osmosis concentrate of dyeing and printing wastewater treated by the reactor constructed with an internally anode-enhanced tubular electrocatalytic membrane in Example 1 over time.

[0024] Figure 3 The change of organic matter in the reverse osmosis concentrate of coking wastewater treated by the reactor constructed with an internally anode-enhanced tubular electrocatalytic membrane in Example 1 over time. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Example 1 An internally anode-enhanced tubular electrocatalytic membrane reactor and its application are disclosed. The anode is a 20 μm tubular Ti-NATA / SnO2-Sb electrocatalytic membrane, the cathode is a mesh stainless steel, and the internal solid conductive rod is a 2 mm titanium rod. Figure 1The circulating flow experimental setup shown includes: 1, a stainless steel cathode; 2, a 20μm tubular Ti-NATA-SnO2-Sb electrocatalytic membrane anode; 3, an electrolytic cell; 4, an adjustable DC regulated power supply; 5, a magnetic stirrer; 6, a peristaltic pump; 7, a rotor; 8, a three-connector converter; and 9, a solid conductive rod. The electrolytic cell is connected to the adjustable DC regulated power supply (4), set at a current density of 20mA / cm². 550mL of reverse osmosis concentrate from dyeing and printing wastewater passes through the stainless steel cathode (1) and then through the tubular Ti-NATA-SnO2-Sb electrocatalytic membrane anode before entering the cell. The peristaltic pump provides pressure at a flow rate of 240mL / min, causing the reverse osmosis concentrate from the dyeing and printing wastewater to flow... Figure 3 The solid arrow indicates that the water flows through a stainless steel cathode (1), then through the interior of a tubular Ti-NATA-SnO2-Sb electrocatalytic membrane (2), followed by pressure from a peristaltic pump into a three-connector converter. After passing through a flexible tube, the water then flows back to the reactor via a peristaltic pump (6). This process is repeated, with samples taken every 60 minutes to measure COD concentration. The run time is 3 hours. Experimental results are as follows: Figure 2 As shown, the internally anode-enhanced tubular electrocatalytic reactor of the present invention can effectively degrade organic pollutants in the reverse osmosis concentrate of dyeing and printing wastewater.

[0028] Example 2 An internally anode-enhanced tubular electrocatalytic membrane reactor and its application are disclosed. The anode is a 50 μm tubular Ti-NATA / SnO2-Sb electrocatalytic membrane, the cathode is a mesh stainless steel, and a 2 mm solid titanium rod is added internally. Figure 1 The circulating flow experimental setup shown includes: 1. Stainless steel cathode; 2. 50μm tubular Ti-NATA-SnO2-Sb electrocatalytic membrane anode; 3. Electrolytic cell; 4. Adjustable DC regulated power supply; 5. Magnetic stirrer; 6. Peristaltic pump; 7. Rotor; 8. Three-connector converter; and 9. Solid conductive rod. The electrolytic cell is connected to the adjustable DC regulated power supply (4), set at a current density of 25mA / cm². 550mL of coking wastewater reverse osmosis concentrate passes through the stainless steel cathode (1) and then through the tubular Ti-NATA-SnO2-Sb electrocatalytic membrane anode (2) before entering the cell. The three-connector converter is connected, and the peristaltic pump provides pressure at a flow rate of 240mL / min, causing the coking wastewater reverse osmosis concentrate to flow... Figure 3 The solid arrow indicates that the water flows through a stainless steel cathode (1), then through the interior of a tubular Ti-NATA-SnO2-Sb electrocatalytic membrane (2), followed by pressure from a peristaltic pump into a three-connector converter. After passing through a flexible tube, the water then flows back to the reactor via a peristaltic pump (6). This process is repeated, with samples taken every 40 minutes to measure COD concentration. The run time is 6 hours. Experimental results are as follows: Figure 3 As shown, the internally anode-enhanced tubular electrocatalytic membrane reactor of the present invention can efficiently degrade organic matter in the reverse osmosis concentrate of coking wastewater.

[0029] The above detailed description is a specific description of one of the feasible embodiments of the present invention. This embodiment is not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included in the scope of the technical solution of the present invention.

Claims

1. An internally anode-enhanced tubular electrocatalytic membrane reactor, characterized in that: It consists of an electrolytic cell 3, an adjustable DC regulated power supply 4, a magnetic stirrer 5, a peristaltic pump 6, and a three-connector converter 8. The electrolytic cell 3 contains a tubular cathode 1, a tubular electrocatalytic membrane anode 2, a rotor 7, and an inner anode 9. The tubular electrocatalytic membrane anode 2 is connected to the three-connector converter 8 and a flexible hose. The flexible hose is connected to the pump pipe of the peristaltic pump, and the pump pipe is connected to a valve on the right wall of the electrolytic cell 3 to realize the reaction circulation. A solid conductive rod 9 is inserted into the three-connector converter 8. The three-connector converter 8 can fix the solid conductive rod 9 inside the tubular electrocatalytic membrane anode 2 while connecting to it.

2. The internally anode-enhanced tubular electrocatalytic membrane reactor according to claim 1, characterized in that: Electrolytic cell 3 has a height of 20cm, an outer diameter of 10cm, and a thickness of 2mm; the connecting tubular electrocatalytic membrane anode hose has a length of 5cm, an outer diameter of 1.6cm, and a thickness of 2mm; the pump tube has a length of 15cm, an outer diameter of 8mm, and a wall thickness of 1.6mm; the three-connector converter consists of a cube with a length of 5cm, a width of 3cm, and a height of 3cm, connected to a cylinder with an outer diameter of 1.6cm.

3. The internally anode-enhanced tubular electrocatalytic membrane reactor according to claim 1, characterized in that: The solid conductive rod 9 is made of titanium and has a diameter of 2mm.

4. The internally anode-enhanced tubular electrocatalytic membrane reactor according to claim 1, characterized in that: Electrolytic cell 3 is placed on magnetic stirrer 5, and rotor 7 is placed inside electrolytic cell 3 to form a homogeneous solution inside electrolytic cell 3.

5. The internally anode-enhanced tubular electrocatalytic membrane reactor according to claim 1, characterized in that: The anode of the tubular electrocatalytic membrane inside the electrolytic cell 3 is connected to the positive terminal of an adjustable DC regulated power supply; the cathode is connected to the negative terminal of an adjustable DC regulated power supply; and an additional wire is added, with one end connected to a 2mm built-in titanium rod and the other end connected to the anode of the adjustable DC regulated power supply.

6. The internally anode-enhanced tubular electrocatalytic membrane reactor according to claim 1, characterized in that: The adjustable DC regulated power supply has a current adjustment range of 0-5A.

7. The internally anode-enhanced tubular electrocatalytic membrane reactor according to claim 1, characterized in that: The peristaltic pump is used to provide negative pressure inside the membrane, allowing the reaction feed liquid to permeate through the separation membrane from the outside to the inside along the pipeline.

8. An application of the internally anode-enhanced tubular electrocatalytic membrane reactor according to claims 1-7, characterized in that: It is used for the deep treatment of reverse osmosis concentrate from dyeing and printing wastewater and reverse osmosis concentrate from coking wastewater, and can effectively degrade organic matter in reverse osmosis concentrate.

9. The application of the internally anode-enhanced tubular electrocatalytic membrane reactor according to claim 8, characterized in that: Current density 15-25 mA / cm².

10. The application of the internally anode-enhanced tubular electrocatalytic membrane reactor according to claim 8, characterized in that: Processing capacity: 500-1500 mL.

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