Wastewater COD (Chemical Oxygen Demand) degradation and hydrogen production coupling device

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a wastewater COD (Chemical Oxygen Demand) degradation and hydrogen production coupling device which comprises a cathode wastewater supplementing tank, an anode wastewater supplementing tank, a cathode wastewater storage tank, an anode wastewater storage tank, a cathode centrifugal pump, an anode centrifugal pump, a COD degradation and hydrogen production reactor and a direct-current power supply, a connecting pipeline and a valve are arranged among the wastewater supplementing tank, the wastewater storage tank and the centrifugal pump; connecting pipelines are arranged between the cathode centrifugal pump and the COD degradation hydrogen production reactor and between the anode centrifugal pump and the COD degradation hydrogen production reactor and are respectively connected with a cathode and an anode of the COD degradation hydrogen production reactor; connecting pipelines are respectively arranged between the COD degradation hydrogen production reactor and the cathode wastewater storage tank and between the COD degradation hydrogen production reactor and the anode wastewater storage tank; the direct-current power supply is electrically connected with the COD degradation hydrogen production reactor. The integrated COD degradation device disclosed by the utility model can realize continuous operation, and has the characteristics of simple composition, greenness, low carbon, continuity, reliability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a wastewater COD degradation coupled hydrogen production device. Background Art

[0002] Chemical Oxygen Demand (COD) is a chemical method used to measure the amount of oxidizable substances in water. It can characterize the level of pollutants in contaminated water sources and is considered an important parameter for rapidly determining the level of organic pollutants in various industries, including the petroleum, chemical, and wastewater treatment industries. It is often represented by the symbol COD. Excessive COD levels in water can disrupt the natural habitats of various organisms and emit irritating odors, adversely affecting surrounding residents and the environment. Consequently, the state has introduced discharge standards for water containing COD, requiring all industries to reduce the COD content in their water according to the corresponding indicators to meet discharge requirements.

[0003] Traditionally, chemical and microbial degradation methods have been used to treat wastewater with high COD content. The chemical method involves adding strong oxidants to the wastewater to oxidize the high-COD wastewater. Commonly used oxidants include potassium permanganate, ozone, and chlorine. These oxidants can oxidize organic matter into inorganic substances or lower molecular weight organic matter, thereby reducing COD. However, it is difficult to control the amount of oxidants added during the treatment process, which can easily cause secondary pollution. The microbial degradation method uses activated sludge containing microorganisms to treat wastewater, oxidizing the organic matter in the water and thus reducing the COD content in the wastewater. However, the microorganisms in this microbial degradation method are easily affected by external environmental factors such as temperature and pH value, resulting in limited microbial ability to treat organic matter. In addition, in the process of batch COD reduction, the use of microbial treatment requires precise control of various operating parameters, which greatly increases the complexity of actual operation and management.

[0004] It can be seen that, in response to the existing COD degradation problem, proposing a wastewater COD degradation coupled hydrogen production device is an important issue that needs to be solved urgently in this field. Utility Model Content

[0005] In order to solve the various drawbacks of existing COD degradation technology, the purpose of this utility model is to provide a wastewater COD degradation coupled hydrogen production device to at least partially solve the problems existing in the existing technology. In order to achieve the above-mentioned purpose of the invention, the utility model provides the following technical solutions.

[0006] A wastewater COD degradation coupled hydrogen production device, comprising a cathode wastewater replenishing tank, an anode wastewater replenishing tank, a cathode wastewater storage tank, an anode wastewater storage tank, a cathode centrifugal pump, an anode centrifugal pump, a COD degradation hydrogen production reactor, and a DC power supply;

[0007] Connecting pipes and valves are provided between the cathode wastewater replenishing tank, the cathode wastewater storage tank, and the cathode centrifugal pump; connecting pipes and valves are provided between the anode wastewater replenishing tank, the anode wastewater storage tank, and the anode centrifugal pump;

[0008] Connecting pipes are provided between the cathode centrifugal pump and the anode centrifugal pump and the COD degradation hydrogen production reactor, and are connected to the cathode and anode of the COD degradation hydrogen production reactor respectively;

[0009] The COD degradation hydrogen production reactor is provided with connecting pipes between the cathode wastewater storage tank and the anode wastewater storage tank respectively;

[0010] The DC power supply is electrically connected to the COD degradation hydrogen production reactor.

[0011] Furthermore, a high-level platform is provided, and the cathode wastewater replenishing tank and the anode wastewater replenishing tank are located on the high-level platform.

[0012] Furthermore, a heating device is provided in the cathode wastewater replenishing tank and the anode wastewater replenishing tank.

[0013] Furthermore, a heating device is provided in the cathode wastewater storage tank and the anode wastewater storage tank.

[0014] Furthermore, the cathode wastewater storage tank and the anode wastewater storage tank are cylindrical structures, with a heating rod with a front end head running through the center, and the axial temperature distribution is uniform, with a maximum temperature difference not exceeding 5°C.

[0015] Furthermore, the cathode and anode of the COD degradation hydrogen production reactor are respectively provided with wastewater outlets, and the cathode wastewater storage tank and the anode wastewater storage tank are respectively provided with wastewater inlets.

[0016] Furthermore, gas exhaust ports are provided on the tops of the cathode wastewater storage tank and the anode wastewater storage tank.

[0017] Furthermore, the tops of the cathode wastewater storage tank and the anode wastewater storage tank are sealed with flanges and have ferrule-type joints, including a wastewater replenishment tank inlet, a wastewater circulating liquid inlet, and a gas outlet.

[0018] Furthermore, the bottom of the cathode wastewater storage tank and the bottom of the anode wastewater storage tank are respectively provided with a ferrule joint and a ball valve.

[0019] Furthermore, it also includes a central control panel, on which all equipment power and control systems are integrated.

[0020] Furthermore, it also includes a renewable energy power generation device, which is connected to the gas exhaust port set on the top of the cathode wastewater storage tank 3 and is connected to the DC power supply 8.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The wastewater COD degradation coupled hydrogen production device described in the present invention is an integrated COD degradation device that can achieve continuous operation, thereby obtaining water quality with low organic pollutants. It has the characteristics of simple composition, green and low carbon, continuous and reliable, and can significantly extend the operation cycle of the wastewater COD degradation device.

[0023] (2) The wastewater COD degradation coupled hydrogen production device described in the present invention can be coupled with renewable energy power generation to achieve wastewater COD degradation driven by green electricity, realize long-term green and low-carbon operation, and help achieve the country's "dual carbon" strategic goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The wastewater COD degradation coupled hydrogen production device of the utility model; wherein: 1: cathode wastewater replenishing tank, 2: anode wastewater replenishing tank, 3: cathode wastewater storage tank, 4: anode wastewater storage tank, 5: cathode centrifugal pump, 6: anode centrifugal pump, 7: COD degradation hydrogen production reactor, 8: DC power supply, 9: central control panel;

[0026] Figure 2 This is a top view of the four ferrule-type joints of the flange of the wastewater storage tank in the wastewater COD degradation coupled hydrogen production device described in the present invention, where A is the wastewater replenishment tank inlet, B is the heating rod port, C is the wastewater circulating liquid inlet, and D is the gas exhaust port;

[0027] Figure 3 This is a cross-sectional view of the COD degradation hydrogen production reactor, where the serpentine flow channel at a is filled with catalyst. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings, wherein some valves, connecting pipes, etc. are omitted in the drawings, but these are well known to those skilled in the art.

[0029] It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments may be combined with each other; and, based on the embodiments in this disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of this disclosure.

[0030] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0031] like Figure 1 As shown, the wastewater COD degradation coupled hydrogen production device of the present invention includes a cathode wastewater replenishing tank 1, an anode wastewater replenishing tank 2, a cathode wastewater storage tank 3, an anode wastewater storage tank 4, a cathode centrifugal pump 5, an anode centrifugal pump 6, a COD degradation hydrogen production reactor 7, and a DC power supply 8;

[0032] Connecting pipes and valves are provided between the cathode wastewater replenishing tank 1, the cathode wastewater storage tank 3, and the cathode centrifugal pump 5, and connecting pipes and valves are provided between the anode wastewater replenishing tank 2, the anode wastewater storage tank 4, and the anode centrifugal pump 6 for controlling wastewater transportation;

[0033] Connecting pipes are provided between the cathode centrifugal pump 5 and the anode centrifugal pump 6 and the COD degradation hydrogen production reactor 7, which are respectively connected to the cathode and anode of the COD degradation hydrogen production reactor 7, for transporting wastewater to the COD degradation hydrogen production reactor; wherein, the cathode centrifugal pump 5 is connected to the cathode of the COD degradation hydrogen production reactor 7, and the anode centrifugal pump 6 is connected to the anode of the COD degradation hydrogen production reactor 7.

[0034] The COD degradation hydrogen production reactor 7 is respectively provided with connecting pipes with the cathode wastewater storage tank 3 and the anode wastewater storage tank 4, which are used to return the wastewater after the COD degradation reaction to the cathode wastewater storage tank 3 and the anode wastewater storage tank 4; wherein, the wastewater on the cathode side of the COD degradation hydrogen production reactor 7 after the COD degradation reaction is returned to the cathode wastewater storage tank 3 through the connecting pipe between the cathode wastewater storage tank 3, and the wastewater on the anode side of the COD degradation hydrogen production reactor 7 is returned to the anode wastewater storage tank 4 through the connecting pipe between the anode wastewater storage tank 4.

[0035] The DC power supply 8 is connected to the COD degradation hydrogen production reactor 7 and is used to control the COD degradation hydrogen production reactor to perform a COD degradation reaction.

[0036] The COD degradation and hydrogen production reactor 7 is an electrolytic reactor composed of symmetrically placed metal plates. A wastewater flow pipe is provided in the middle of the metal plates. Wastewater flows from the cathode side and the anode side of the COD degradation and hydrogen production reactor 7 in a countercurrent manner through a cathode centrifugal pump 5 and an anode centrifugal pump 6, respectively, into the COD degradation and hydrogen production reactor 7, flowing from bottom to top. COD degradation and hydrogen production reactions are completed under the action of a DC power supply 8. After the wastewater reacts in the COD degradation and hydrogen production reactor 7, the COD content can be reduced by 80%.

[0037] Furthermore, the wastewater COD degradation coupled hydrogen production device described in the present invention is provided with a high-level platform, and the cathode wastewater replenishing tank 1 and the anode wastewater replenishing tank 2 are located on the high-level platform.

[0038] Furthermore, in some embodiments, the cathode wastewater replenishing tank 1 and the anode wastewater replenishing tank 2 are tapered structures that are narrow at the bottom and wide at the top, and are half-embedded in the supporting bottom plate of the high platform.

[0039] Furthermore, the cathode wastewater replenishing tank 1 and the anode wastewater replenishing tank 2 are provided with heating devices to preheat the wastewater.

[0040] In some embodiments, the side walls of the cathode wastewater replenishment tank 1 and the anode wastewater replenishment tank 2 are provided with heating plates to heat and keep the wastewater warm. The preheating temperature can be pre-set or set by the control system through the central control panel 9.

[0041] Furthermore, after the wastewater in the cathode wastewater replenishment tank 1 and the anode wastewater replenishment tank 2 reaches a preset temperature, the pipeline valves connected to the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 are opened, and the wastewater inside the cathode wastewater replenishment tank 1 and the anode wastewater replenishment tank 2 respectively flows into the cathode wastewater storage tank 3 and the anode wastewater storage tank 4. The control system of the pipeline valves can be integrated into the central control panel 9.

[0042] Furthermore, the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 are provided with heating devices for secondary heating and heat preservation of the wastewater.

[0043] Furthermore, the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 are cylindrical structures, with a heating rod with a front end cap running through the center. The axial temperature distribution is uniform, and the maximum temperature difference does not exceed 5°C.

[0044] Furthermore, the cathode and anode of the COD degradation hydrogen production reactor 7 are respectively provided with wastewater outlets, and the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 are respectively provided with wastewater inlets. The cathode side wastewater outlet of the COD degradation hydrogen production reactor 7 is connected to the wastewater inlet of the cathode wastewater storage tank 3 through a pipeline, and the anode side wastewater outlet of the COD degradation hydrogen production reactor 7 is connected to the wastewater inlet of the anode wastewater storage tank 4 through a pipeline. The wastewater after the COD degradation reaction is completed is transported from the cathode and anode of the COD degradation hydrogen production reactor 7 back to the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 through pipelines for recycling.

[0045] Furthermore, a gas outlet is provided on the top of the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 to discharge the gas that enters the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 along with the circulating wastewater, while ensuring the balance of internal and external air pressure.

[0046] Further, such as Figure 2 As shown, the tops of the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 are flange-sealed and have ferrule-type joints, including a wastewater replenishment tank inlet A, a wastewater circulating liquid inlet C, a gas outlet D, and further, a heating rod port B. The wastewater replenishment tank inlet A is connected to the wastewater replenishment tank via a pipeline, allowing wastewater inside the wastewater replenishment tank to flow into the wastewater storage tank; the wastewater circulating liquid inlet C is connected to the COD degradation hydrogen production reactor 7 via a pipeline, for transporting wastewater back after the COD degradation reaction; the gas outlet D is used to discharge gas entering the wastewater storage tank with the circulating wastewater; and the heating rod port B is used to fix the heating rod that runs through the center of the wastewater storage tank.

[0047] Furthermore, a ferrule-type joint is provided at the bottom of each of the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 for connecting to the pipelines of the cathode centrifugal pump 5 and the anode centrifugal pump 6, and a ball valve is provided.

[0048] Furthermore, it also includes a central control panel 9, on which all equipment power supplies and control systems are integrated. Through the central control panel 9, various devices in the equipment can be centrally controlled to achieve one-button start and real-time monitoring of all parameters.

[0049] Furthermore, the wastewater COD degradation coupled hydrogen production device of the present invention also includes a renewable energy power generation device, which is connected to the gas outlet provided on the top of the cathode wastewater storage tank 3, and the renewable energy power generation device is connected to a DC power supply 8. The hydrogen generated by COD degradation enters the renewable energy power generation device through the gas outlet of the cathode wastewater storage tank 3 to generate electricity, and is connected to the DC power supply 8 to drive the COD degradation hydrogen production reactor 7 to perform the wastewater COD degradation reaction, thereby achieving green electricity-driven wastewater COD degradation and realizing long-term green and low-carbon operation.

[0050] The detailed operation process of the device described in the utility model is as follows: wastewater with high COD content, such as oilfield produced water, chemical wastewater, and urban reclaimed water, is respectively input into the cathode wastewater replenishing tank 1 and the anode wastewater replenishing tank 2 for preheating treatment after natural sedimentation and impurity removal, and the heating temperature is 40-90°C; after reaching the preset temperature, the valves below the cathode wastewater replenishing tank 1 and the anode wastewater replenishing tank 2 are opened, and the internal wastewater flows into the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 respectively. A vertical heating device is provided in the middle of the wastewater storage tank to perform secondary heating and heat preservation on the wastewater; then the wastewater flows out from the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 and enters the cathode centrifugal pump 5 and the anode centrifugal pump 6 respectively, and the wastewater is transported to the COD degradation hydrogen production reactor 7 through the water pump; The wastewater comes into contact with the catalyst filled in the serpentine flow channel of the COD degradation hydrogen production reactor and reacts under the action of a DC power supply 8. The COD degradation hydrogen production reactor is entirely made of high-purity, corrosion-resistant titanium. An oxidation reaction occurs near the anode metal plate, completing the oxidation of organic matter to reduce COD, while a reduction reaction is completed near the cathode metal plate to produce hydrogen. The wastewater after the reaction is entrained with gas and circulated back to the cathode wastewater storage tank 3 and the anode wastewater storage tank 4 for gas-liquid separation. The hydrogen produced on the cathode side is transported from the top of the cathode wastewater storage tank 3 to the subsequent gas separation unit for purification to obtain pure hydrogen. The carbon dioxide and other gases produced on the anode side can be directly discharged from the top of the anode wastewater storage tank 4 to complete the COD degradation in the wastewater, ultimately obtaining water quality with degraded COD. The carbon dioxide produced on the anode side can also be absorbed in the water to form carbonate ions.

[0051] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A wastewater COD degradation coupled hydrogen production device, characterized in that: It includes a cathode wastewater replenishing tank (1), an anode wastewater replenishing tank (2), a cathode wastewater storage tank (3), an anode wastewater storage tank (4), a cathode centrifugal pump (5), an anode centrifugal pump (6), a COD degradation hydrogen production reactor (7), and a DC power supply (8); Connecting pipes and valves are provided between the cathode wastewater replenishing tank (1), the cathode wastewater storage tank (3), and the cathode centrifugal pump (5); connecting pipes and valves are provided between the anode wastewater replenishing tank (2), the anode wastewater storage tank (4), and the anode centrifugal pump (6); Connecting pipes are provided between the cathode centrifugal pump (5) and the anode centrifugal pump (6) and the COD degradation hydrogen production reactor (7), and are respectively connected to the cathode and anode of the COD degradation hydrogen production reactor (7); Connecting pipes are provided between the COD degradation hydrogen production reactor (7) and the cathode wastewater storage tank (3) and the anode wastewater storage tank (4). The DC power supply (8) is electrically connected to the COD degradation hydrogen production reactor (7).

2. The wastewater COD degradation coupled hydrogen production device according to claim 1 is characterized in that: A high-level platform is provided, and the cathode wastewater replenishing tank (1) and the anode wastewater replenishing tank (2) are located on the high-level platform.

3. The wastewater COD degradation coupled hydrogen production device according to claim 1 or 2, characterized in that: The cathode wastewater replenishing tank (1) and the anode wastewater replenishing tank (2) are provided with heating devices; and the cathode wastewater storage tank (3) and the anode wastewater storage tank (4) are provided with heating devices.

4. The wastewater COD degradation coupled hydrogen production device according to claim 3 is characterized in that: The cathode wastewater storage tank (3) and the anode wastewater storage tank (4) are cylindrical structures, with a heating rod with a front end cap running through the center, and the axial temperature distribution is uniform, with the maximum temperature difference not exceeding 5°C.

5. The wastewater COD degradation coupled hydrogen production device according to claim 1, characterized in that: The cathode and anode of the COD degradation hydrogen production reactor (7) are respectively provided with wastewater outlets, and the cathode wastewater storage tank (3) and the anode wastewater storage tank (4) are respectively provided with wastewater inlets.

6. The wastewater COD degradation coupled hydrogen production device according to claim 5, characterized in that: Gas discharge ports are provided on the tops of the cathode wastewater storage tank (3) and the anode wastewater storage tank (4).

7. The wastewater COD degradation coupled hydrogen production device according to claim 6, characterized in that: The tops of the cathode wastewater storage tank (3) and the anode wastewater storage tank (4) are sealed with flanges and provided with ferrule-type joints, including a wastewater replenishment tank inlet, a wastewater circulating liquid inlet, and a gas outlet.

8. The wastewater COD degradation coupled hydrogen production device according to claim 1, characterized in that: The cathode wastewater storage tank (3) and the anode wastewater storage tank (4) are each provided with a ferrule-type joint at the bottom, and are also provided with a ball valve.

9. The wastewater COD degradation coupled hydrogen production device according to claim 1, characterized in that: It also includes a central control panel (9), on which all equipment power supplies and control systems are integrated.

10. The wastewater COD degradation coupled hydrogen production device according to claim 6, characterized in that: It also includes a renewable energy power generation device, which is communicated with a gas outlet provided on the top of the cathode wastewater storage tank (3), and is connected to a DC power supply (8).

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