A wastewater treatment device using a microbial electrolysis cell

Abstract

This invention relates to the field of wastewater treatment equipment technology, specifically to a microbial electrolysis wastewater treatment device, comprising: an overflow treatment component including a stepped overflow tank, wherein a pre-electrolysis tank, a microbial tank, and a secondary electrolysis tank are sequentially separated along the overflow direction by vertically arranged overflow plates within the stepped overflow tank; electrode tanks are separated on both sides of the pre-electrolysis tank and the secondary electrolysis tank by side partition plates, and conductive mesh plates for connecting the two side tanks are installed on the side partition plates; anode plates for electrolyzing wastewater by connecting to an external power source are respectively installed in the electrode tanks on both sides; this device innovatively features a multi-stage overflow arrangement of pre-electrolysis tanks, microbial tanks, and secondary electrolysis tanks, enabling synergistic treatment of electrolysis and microorganisms, allowing for pretreatment of complex wastewater, which helps to ensure microbial activity and achieve reliable and continuous wastewater treatment function and effect.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and specifically to a microbial electrolysis cell wastewater treatment device. Background Technology

[0002] With the acceleration of industrial development and urbanization, the amount of wastewater discharged from industries such as chemical industry, aquaculture, and printing and dyeing has continued to increase. The composition of such wastewater is becoming increasingly complex, generally containing heavy metal ions, toxic organic pollutants (such as phenols and polycyclic aromatic hydrocarbons), and recalcitrant macromolecular organic matter, along with high concentrations of ammonia nitrogen and pathogenic microorganisms. Direct discharge of such wastewater will cause serious damage to aquatic ecosystems.

[0003] Among existing wastewater treatment technologies, microbial treatment technology utilizes the metabolic activity of functional bacteria (such as aerobic bacteria, anaerobic bacteria, and nitrifying bacteria) in microbial sludge to convert organic matter in wastewater into harmless substances such as carbon dioxide and water, thereby purifying pollutants. However, when treating complex wastewater containing heavy metals, toxic substances, and recalcitrant organic matter, there are significant technical defects that lead to unstable treatment results. On the one hand, heavy metal ions (such as copper and lead ions) in wastewater can easily damage the integrity of microbial cell membranes, and toxic organic matter can inactivate key metabolic enzymes, inhibit microbial respiration, reproduction, and other life activities, and even cause the death of functional bacteria, resulting in a sharp drop in the activity of microbial sludge and a significant decline in degradation efficiency.

[0004] Therefore, existing microbial wastewater treatment devices are difficult to adapt to the treatment needs of complex wastewater, and there is an urgent need for a device that can ensure the activity of microorganisms and obtain reliable and continuous wastewater treatment results; in view of this, we propose a microbial electrolysis tank wastewater treatment device. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings mentioned in the background section and provide a microbial electrolysis cell wastewater treatment device.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A wastewater treatment device using a microbial electrolysis cell, comprising:

[0008] The overflow treatment assembly includes a stepped overflow tank, wherein a pre-electrolysis tank, a microbial tank, and a secondary electrolysis tank are sequentially separated along the overflow direction by vertically arranged overflow plates.

[0009] Both the pre-electrolysis cell and the secondary electrolysis cell are separated by electrode cells on both sides by side partition plates, and the side partition plates are equipped with conductive mesh plates for connecting the two cell chambers.

[0010] The two sides of the electrode plate pool are respectively equipped with an anode plate and an anode plate for electrolyzing sewage by connecting an external power source;

[0011] The scraping unit includes a U-shaped positioning seat installed on the side partition plates on both sides, and a scraper that is vertically installed along the U-shaped positioning seat. The scraper is used to scrape off the accumulated impurities on the outer surface of the guide mesh plate to maintain water flow.

[0012] Preferably, the pre-electrolysis cell is equipped with a solid waste retrieval conveyor belt for retrieving solid waste.

[0013] Preferably, a rotating shaft is rotatably installed inside the secondary electrolysis cell, and a drive motor coaxially connected to the rotating shaft is installed on the outer wall of the stepped effluent tank;

[0014] A stirring roller is mounted on the rotating shaft inside the secondary electrolysis cell. The stirring roller is used to agitate the water for thorough electrolysis.

[0015] Preferably, the scraping unit includes a ratchet coaxially fixed on the rotating shaft;

[0016] The U-shaped positioning seat is provided with a lifting groove for vertically sliding the lifting block, and the upper and lower ends of the lifting block are respectively fixedly connected to a pawl and a scraper.

[0017] Preferably, the lifting block is provided with a lifting protrusion for insertion into the lifting groove, and a return spring is installed between the lifting protrusion and the wall of the lifting groove;

[0018] When the ratchet rotates, the lifting block is lifted upward by the pawl and reset downward by the reset spring.

[0019] Preferably, the scraper includes a strip plate corresponding to the position of the guide mesh plate. When the lifting block moves up and down, the strip plate is used to scrape off the impurities accumulated on the surface of the guide mesh plate.

[0020] Preferably, a filter plate is installed on the stepped spillway and on the outside of the secondary electrolysis cell at the lowest end, the filter plate being used to remove floating impurities.

[0021] Preferably, the microbial tank is equipped with a flip-top plate that is rotated by the drive motor for anaerobic and aerobic treatment after opening and closing, and the stepped discharge tank is provided with a sludge discharge valve pipe that connects the microbial tank for circulating discharge of microbial sludge.

[0022] Preferably, a bottom slag discharge valve pipe for discharging settled solid waste is installed on the overflow plate along the outer edge of the secondary electrolysis cell.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. This microbial electrolysis wastewater treatment device innovatively features a pre-electrolysis tank, a microbial tank, and a secondary electrolysis tank with multi-stage overflow settings, enabling synergistic treatment by electrolysis and microorganisms, which is conducive to achieving wastewater treatment operations with no chemical residues and high efficiency on a large scale.

[0025] 2. This device can pretreat complex sewage, avoiding the problem of sewage directly contacting the microbial substrate and killing the activity of microorganisms. This helps to ensure the activity of microorganisms and obtain reliable and continuous sewage treatment functions and effects. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, 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 undue limitation of the invention. In the drawings:

[0027] Figure 1 This is one of the schematic diagrams of the overall structure of the present invention;

[0028] Figure 2 This is the second schematic diagram of the overall structure of the present invention;

[0029] Figure 3 This is the third schematic diagram of the overall structure of the present invention;

[0030] Figure 4 This is the fourth schematic diagram of the overall structure of the present invention;

[0031] Figure 5 This is a cross-sectional view of the overall structure of the present invention;

[0032] Figure 6 This is a partial installation diagram of the overflow treatment component of the present invention;

[0033] Figure 7 This is a schematic diagram of the scraping unit of the present invention.

[0034] The meanings of the labels in the diagram are as follows:

[0035] 1. Overflow treatment assembly; 11. Stepped overflow tank; 12. Side partition plate; 13. Overflow plate; 14. Sludge discharge valve pipe; 15. Bottom slag discharge valve pipe; 101. Pre-electrolysis tank; 102. Microbial tank; 103. Secondary electrolysis tank; 104. Electrode tank;

[0036] 2. Rotating shaft; 3. Drive motor;

[0037] 4. Scraping unit; 41. Ratchet; 42. U-shaped positioning seat; 421. Lifting groove; 43. Lifting block; 431. Lifting protrusion; 44. Pawl; 45. Scraper; 451. Strip plate;

[0038] 5. Filter plate; 6. Agitator roller; 7. Guide mesh plate; 8. Flip cover plate; 9. Solid waste collection conveyor belt. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1-7 The present invention will describe the above technical solution in detail through the following embodiments:

[0041] The wastewater treatment device in this embodiment includes an overflow treatment component 1, which specifically includes a stepped overflow tank 11. Because heavy metal ions in wastewater can easily damage the integrity of microbial cell membranes, and toxic organic matter can inactivate key metabolic enzymes, inhibit the life activities of microorganisms such as respiration and reproduction, and even lead to the death of functional bacteria, causing a sharp drop in the activity of microbial substrate sludge, it is not recommended to directly discharge wastewater into the microbial treatment tank for anaerobic and aerobic treatment in complex situations. It is desirable to obtain reliable microbial activity for continuous treatment.

[0042] Therefore, in this embodiment, the overflow plate 13 along the overflow direction of the stepped overflow pool 11 sequentially divides the pre-electrolysis pool 101, the microbial pool 102, and the secondary electrolysis pool 103. The pre-electrolysis pool 101 and the secondary electrolysis pool 103 are separated by electrode pools 104 on both sides by side partition plates 12. In order to obtain a conductive path, the sewage is used as an electrolyte for electrolysis treatment. A conductive mesh plate 7 is installed on the side partition plate 12. Anode plates are installed in the electrode pools 104 on both sides to form a closed loop for electrolysis of sewage.

[0043] Inside the microbial tank 102, a flip-top plate 8 is installed by a drive motor 3. When the flip-top plate 8 is closed, it can maintain a sealed anaerobic environment. It can be opened during aerobic treatment. The microbial substrate sludge in this embodiment has a long service life and can be periodically discharged as mother sludge. Therefore, a sludge discharge valve pipe 14 is installed on the microbial tank 102 to facilitate the discharge of microbial substrate sludge.

[0044] Meanwhile, considering that the presence of impurities will affect the electrolysis conduction path, this embodiment installs a solid waste collection conveyor belt 9 in the pre-electrolysis tank 101 to continuously collect a large amount of solid waste impurities to avoid accumulation and blockage. At the same time, the sewage treated by the first two treatment tanks enters the secondary electrolysis tank 103. Considering that it is necessary to treat the difficult-to-decompose organic impurities, a certain amount of sediment will be generated. In order to prevent blockage, scraping units 4 are installed on the side partition plates 12 on both sides through U-shaped positioning seats 42 to scrape the impurities accumulated on the outer surface of the conduction mesh plate 7 to maintain water flow.

[0045] Specifically, such as Figures 5-7 As shown in the structure, in order to fully treat the water to be discharged, a rotating shaft 2 is rotatably installed inside the secondary electrolysis cell 103. A stirring roller 6 for stirring the water to fully electrolyze is fitted on the rotating shaft 2. A drive motor 3 for driving the rotating shaft 2 is installed on the outer wall of the stepped spillway 11.

[0046] The scraping unit 4 includes a ratchet 41 coaxially fixed on the rotating shaft 2, and a lifting block 43 slidably mounted on the U-shaped positioning seat 42 via a lifting groove 421. The lifting block 43 is provided with a lifting protrusion 431 that is clamped in the lifting groove 421 for vertical guidance. In order to obtain the reset capability after scraping, a reset spring is installed between the lifting protrusion 431 and the groove wall of the lifting groove 421. The upper and lower ends of the lifting block 43 are respectively fixedly connected to a pawl 44 and a scraper 45. When the ratchet 41 rotates, the lifting block 43 is lifted upward by the pawl 44 and reset downward by the reset spring. The strip plate 451 provided on the scraper 45 can scrape off the impurities accumulated on the surface of the conductive mesh plate 7 during lifting. A bottom slag discharge valve pipe 15 for discharging settled solid waste is installed on the overflow plate 13 in the discharge direction of the secondary electrolysis cell 103. The overflow impurities will be filtered and the floating impurities will be removed by the filter plate 5 behind.

[0047] It is important to explain that this embodiment takes the treatment of eutrophic domestic sewage as an example, which contains complex impurities such as bacteria, phytoplankton, and organic matter. The pre-electrolysis tank 101 performs pre-electrolysis treatment, which can kill bacteria. After the organic matter in the domestic sewage is electrolyzed and oxidized, its molecular structure changes, its water solubility decreases, and it is transformed from a dissolved state into a micro-particle state, which then aggregates and precipitates, making it easy to remove and discharge. At the same time, heavy metal ions in the sewage will generate hydroxide precipitates in the alkaline microenvironment of electrolysis, which are carried by flocs and are easy to remove. Furthermore, the strong oxidant generated by electrolysis will inactivate pathogenic microorganisms in the sewage. After the dead bacteria lose their activity, their cell membranes rupture and they will aggregate into fine particles, which will settle with the flocs, thus avoiding the inactivation of microbial sludge.

[0048] The secondary electrolysis cell 103 can produce trace sediments, including the deep oxidation and sedimentation of residual pollutants. The trace amounts of recalcitrant organic matter remaining in the effluent of the microbial tank 102, such as trace amounts of phenols, have their molecular structures destroyed under the strong oxidizing action of electrolysis, further reducing their water solubility and forming tiny particles that aggregate and settle. If there are residual calcium, magnesium, phosphate, or other ions in the wastewater, the pH value near the electrodes will change locally during the electrolysis process. For example, if the area near the cathode becomes alkaline, trace amounts of inorganic precipitates such as calcium carbonate and calcium phosphate may be generated. The anaerobic and aerobic properties of the microbial tank 102 are existing technologies and will not be discussed in detail.

[0049] If eutrophication occurs in the wastewater, producing phytoplankton such as algae, an electrolysis reaction can be initiated by applying a potential to the anode and cathode plates, using the wastewater as an electrolyte. An oxidation reaction occurs on the anode surface, where water molecules lose electrons to generate hydroxyl radicals (-OH), oxygen, and other products. These hydroxyl radicals are highly oxidizing, rapidly attacking the cell walls and membranes of algal cells, disrupting cell structure and causing leakage and degradation of intracellular macromolecules such as proteins and nucleic acids. Simultaneously, hydroxyl radicals can directly oxidize and decompose nutrients such as ammonia nitrogen and phosphate in the wastewater, cutting off the nutrient supply to algae and inhibiting their reproduction at the source, thus improving the subsequent dischargeability of the wastewater. On the cathode surface, a reduction reaction occurs, where water molecules gain electrons to generate hydrogen gas. This gas turbulence further promotes water disturbance, increasing the contact efficiency between hydroxyl radicals and pollutants, thereby improving the treatment efficiency and quality of the wastewater.

[0050] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A wastewater treatment device using a microbial electrolysis cell, characterized in that: include: The overflow treatment component (1) includes a stepped overflow tank (11), in which a pre-electrolysis tank (101), a microbial tank (102) and a secondary electrolysis tank (103) are sequentially separated along the overflow direction by vertically arranged overflow plates (13). Both sides of the pre-electrolysis cell (101) and the secondary electrolysis cell (103) are separated by a plate cell (104) by a side partition plate (12), and a conductive mesh plate (7) for connecting the two side cell chambers is installed on the side partition plate (12). The two sides of the electrode plate pool (104) are respectively equipped with an anode plate and an anode plate for electrolyzing sewage by connecting an external power source; The scraping unit (4) includes a U-shaped positioning seat (42) installed on the side partition plates (12) on both sides, and a scraper (45) that is lifted and lowered along the vertical direction of the U-shaped positioning seat (42). The scraper (45) is used to scrape off the accumulated impurities on the outer surface of the guide mesh plate (7) to maintain water flow.

2. The wastewater treatment device with a microbial electrolysis cell as described in claim 1, characterized in that: The pre-electrolysis cell (101) is equipped with a solid waste retrieval conveyor belt (9) for retrieving solid waste.

3. The microbial electrolysis cell wastewater treatment device as described in claim 1, characterized in that: A rotating shaft (2) is rotatably installed inside the secondary electrolytic cell (103), and a drive motor (3) coaxially connected to the rotating shaft (2) is installed on the outer wall of the stepped effluent pool (11). A stirring roller (6) is mounted on the rotating shaft (2) inside the secondary electrolysis cell (103). The stirring roller (6) is used to agitate the water for thorough electrolysis.

4. The microbial electrolysis cell wastewater treatment device as described in claim 3, characterized in that: The scraping unit (4) includes a ratchet (41) coaxially fixed on the rotating shaft (2); The U-shaped positioning seat (42) is provided with a lifting groove (421) for vertically sliding installation of the lifting block (43), and the upper and lower ends of the lifting block (43) are respectively fixedly connected with a pawl (44) and the scraper (45).

5. The wastewater treatment device with a microbial electrolysis cell as described in claim 4, characterized in that: The lifting block (43) is provided with a lifting protrusion (431) for insertion into the lifting groove (421), and a return spring is installed between the lifting protrusion (431) and the groove wall of the lifting groove (421); When the ratchet (41) rotates, the lifting block (43) is lifted upward by the pawl (44) and reset downward by the reset spring.

6. The wastewater treatment device with a microbial electrolysis cell as described in claim 5, characterized in that: The scraper (45) includes a strip plate (451) corresponding to the position of the guide mesh plate (7). When the lifting block (43) is raised or lowered, the strip plate (451) is used to scrape off the impurities accumulated on the surface of the guide mesh plate (7).

7. The wastewater treatment device with a microbial electrolysis cell as described in claim 1, characterized in that: A filter plate (5) is installed on the stepped spillway (11) and outside the secondary electrolysis cell (103) at the lowest end. The filter plate (5) is used to remove floating impurities.

8. The wastewater treatment device with a microbial electrolysis cell as described in claim 3, characterized in that: The microbial tank (102) is equipped with a flip-top plate (8) for anaerobic and aerobic treatment after opening and closing, which is rotated by the drive motor (3). The stepped discharge tank (11) is equipped with a sludge discharge valve pipe (14) that connects the microbial tank (102) for circulating discharge of microbial sludge.

9. The wastewater treatment device with a microbial electrolysis cell as described in claim 1, characterized in that: The overflow plate (13) on the outer edge of the secondary electrolysis cell (103) is connected to a bottom slag discharge valve pipe (15) for discharging settled solid waste.

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