Medical sewage treatment system based on antibiotic regulation and control and multistage photocatalysis

Abstract

The utility model discloses a medical sewage treatment system based on antibiotic regulation and control and multistage photocatalysis, which relates to the technical field of medical sewage treatment and is characterized in that organic matters are efficiently degraded and a nitrification process is started through the synergistic effect of clarithromycin and nitrosomonas; the device greatly improves the ammonia nitrogen removal efficiency of sewage, adopts a Z-type heterojunction photocatalyst in the mineralization pool to efficiently degrade micro pollutants such as antibiotics, has a better drug residue removal effect compared with the traditional technology, is matched with a PID controller to realize full-process automatic control, optimizes operating parameters, is strong in comprehensiveness, and is suitable for large-scale popularization and application. The treatment effect is more efficient and thorough.

Description

Technical Field

[0001] This invention belongs to the field of medical wastewater treatment technology, and specifically relates to a medical wastewater treatment system based on antibiotic regulation and multi-stage photocatalysis. Background Technology

[0002] Currently, hospital wastewater treatment commonly employs processes such as activated sludge combined with disinfection, hydrolysis acidification-contact oxidation combined with chlorine dioxide disinfection, and membrane bioreactors (MBR) combined with chlorine dioxide disinfection. These technologies can effectively remove some pollutants such as ammonia nitrogen from wastewater through the biochemical action of microorganisms. However, their effectiveness in removing residual antibiotics and other trace amounts of drugs in hospital wastewater is limited. These incompletely eliminated hazardous substances, once released into the environment, may pose a potential threat to human health and the natural ecosystem. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a medical wastewater treatment system based on antibiotic regulation and multi-stage photocatalysis to solve the aforementioned technical problems.

[0004] A medical wastewater treatment system based on antibiotic regulation and multi-stage photocatalysis includes the following components:

[0005] Preprocessing unit

[0006] The pretreatment unit includes a stainless steel screen, which is used to filter the wastewater to be treated for residue.

[0007] Equalization tank,

[0008] The regulating tank includes a biological reaction tank, a membrane bioreactor, and a mineralization tank connected in sequence.

[0009] The bioreactor is used to react the wastewater to be treated with antibiotics, namely clarithromycin and nitrosomonas.

[0010] The membrane bioreactor is used to degrade organic matter in wastewater to be treated.

[0011] The mineralization tank is used to perform photocatalytic reactions on the wastewater to be treated. The mineralization tank is equipped with a photocatalytic unit and a catalyst, and the catalyst is a Z-type heterojunction photocatalyst.

[0012] Preferably, the pretreatment unit is equipped with three stainless steel screens, namely an 80-mesh screen, a 200-mesh screen, and a 300-mesh screen, and the wastewater to be treated passes through the three stainless steel screens in the order of the 80-mesh screen, the 200-mesh screen, and the 300-mesh screen.

[0013] Preferably, the bioreactor is further equipped with a pH monitor and a redox potential monitor. The pH monitor is used to monitor the pH value of the solution in the bioreactor, and the redox potential monitor is used to monitor the redox potential of the solution in the bioreactor.

[0014] Preferably, the membrane bioreactor contains CLR-resistant nitrifying bacteria and denitrifying Acinetobacter bacilli.

[0015] Preferably, the porosity of the carrier filling the membrane bioreactor is 90-95%, and the pore size distribution is 50-200 μm.

[0016] Preferably, the photocatalytic unit is a ring-shaped LED array light source, which is used to irradiate the wastewater to be treated in the mineralization pool. The Z-shaped heterojunction photocatalyst is coated on the surface of a quartz glass tube, which is immersed in the wastewater to be treated.

[0017] Preferably, a first flow control device is provided between the output end of the bioreactor and the input end of the membrane bioreactor, a second flow control device is provided between the output end of the membrane bioprojector and the input end of the mineralization tank, and a third flow control device is provided at the output end of the mineralization tank.

[0018] Preferably, the device also includes a PID controller, which is electrically connected to the membrane bioreactor, pH monitor, redox potential monitor, ring LED array light source, first flow control device, second flow control device and third flow control device.

[0019] Preferably, the system also includes a first timer, a second timer, and a third timer, all of which are electrically connected to the PID controller.

[0020] Preferably, the system also includes a PWM dimming controller, wherein the LED array light source, the PWM dimming controller, and the PID controller are electrically connected in sequence.

[0021] The beneficial effects of this invention are as follows: This solution utilizes the synergistic effect of clarithromycin and Nitrosomonas to efficiently degrade organic matter and initiate the nitrification process, significantly improving the efficiency of ammonia nitrogen removal from wastewater. Furthermore, the use of a Z-type heterojunction photocatalyst in the mineralization tank efficiently degrades trace pollutants such as antibiotics. Compared to traditional technologies, it has a better removal effect on trace drugs such as antibiotics. In addition, it is equipped with a PID controller to achieve fully automated control of the entire process, optimize operating parameters, and has strong comprehensiveness, resulting in more efficient and thorough treatment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a medical wastewater treatment system based on antibiotic regulation and multi-stage photocatalysis provided by this utility model;

[0024] Figure 2 A schematic diagram of the structure of a pretreatment unit in a medical wastewater treatment system based on antibiotic regulation and multi-stage photocatalysis provided by this utility model;

[0025] Figure 3 A schematic diagram of the electrical connections of electrical components in a medical wastewater treatment system based on antibiotic regulation and multi-stage photocatalysis provided by this utility model;

[0026] legend:

[0027] 1-Pretreatment unit, 101-80 mesh sieve, 102-200 mesh sieve, 103-300 mesh sieve.

[0028] 2-Biological reaction tank, 3-Membrane bioreactor, 4-Mineralization tank, 5-First flow control device, 6-Second flow control device, 7-Third flow control device. Detailed Implementation

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0031] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0032] like Figure 1 As shown, a medical wastewater treatment system based on antibiotic regulation and multi-stage photocatalysis includes the following components:

[0033] Preprocessing unit 1,

[0034] The pretreatment unit 1 includes a stainless steel screen, which is used to filter the wastewater to be treated for residue.

[0035] Equalization tank,

[0036] The regulating tank includes a biological reaction tank 2, a membrane bioreactor 3, and a mineralization tank 4 connected in sequence.

[0037] The biological reactor 2 is used to react the wastewater to be treated with antibiotics, namely clarithromycin and nitrosomonas.

[0038] The membrane bioreactor 3 is used to degrade organic matter in the wastewater to be treated.

[0039] The mineralization tank 4 is used to carry out photocatalytic reactions on the wastewater to be treated. The mineralization tank 4 is equipped with a photocatalytic unit and a catalyst, and the catalyst is a Z-type heterojunction photocatalyst.

[0040] When used for medical wastewater treatment, this method first filters the wastewater through a stainless steel screen in the pretreatment unit to remove residues, providing initial purification. The filtered wastewater then enters a biological reactor where clarithromycin reacts with the wastewater to further degrade organic matter. The dosage of clarithromycin is 0.5-1.2 ppm. Experiments have shown that clarithromycin can inhibit Gram-positive bacteria, reduce the activity of Staphylococcus aureus by 92.7%, and simultaneously activate Nitrosomonas, increasing their abundance to 4.8 × 10⁻⁶. 6 The nitrification process is initiated at copies / mL. After the wastewater has reacted in the biological reactor, the suspended solids and microorganisms in the wastewater are further separated and purified by the membrane bioreactor. The wastewater output from the membrane bioreactor is then introduced into the mineralization tank, where the difficult-to-treat trace pollutants such as antibiotics are degraded by the Z-type heterojunction photocatalyst, thereby achieving deep purification of medical wastewater.

[0041] Among them, the Z-type heterojunction photocatalyst is a TiO2 composite material, which is prepared by mixing tetrabutyl titanate and Cr(NO3)3·9H2O at a molar ratio of 1:0.3 and reacting it hydrothermally at 160℃ for 12h.

[0042] More specifically, the pretreatment unit 1 is equipped with three stainless steel screens, namely an 80-mesh screen 101, a 200-mesh screen 102, and a 300-mesh screen 103. The wastewater to be treated passes through the three stainless steel screens in the order of the 80-mesh screen 101, the 200-mesh screen 102, and the 300-mesh screen 103.

[0043] Medical wastewater undergoes graded filtration before entering the equalization tank, passing through 80-mesh, 200-mesh, and 300-mesh stainless steel screens in sequence. The 80-mesh screen first intercepts larger particles, the 200-mesh screen further removes medium-sized suspended solids, and the 300-mesh screen filters out even finer impurities. This graded filtration method gradually improves the filtration precision, effectively removing solid particles and suspended solids from the wastewater, providing cleaner influent to the subsequent equalization tank treatment process, reducing clogging and load, and improving overall treatment efficiency.

[0044] More specifically, the bioreactor 2 is also equipped with a pH monitor and a redox potential monitor. The pH monitor is used to monitor the pH value of the solution in the bioreactor 2, and the redox potential monitor is used to monitor the redox potential of the solution in the bioreactor 2.

[0045] The pH monitor is used to monitor the pH value of the solution in the bioreactor in real time to ensure that the microbial activity is within the optimal range. In this scheme, in order to ensure that the activity of clarithromycin and nitrosomonas is in a good state, the pH value is controlled between 6.8 and 7.2 to maintain the efficient organic matter degradation and nitrification process. The pH monitor used here is a Mettler Toledo FG2 pH monitor.

[0046] An oxidation-reduction potential (ORP) monitor is used to monitor the oxidation-reduction potential of the solution. ORP can efficiently reflect the oxidation-reduction state within the tank, helping to optimize reaction conditions and ensure the effective degradation of pollutants such as antibiotics. By monitoring and adjusting pH and ORP in real time, the system's stable operation can be guaranteed, pollutant removal efficiency can be improved, and environmental risks can be reduced. The STIP-sens type ORP monitor used here is an example.

[0047] More specifically, the membrane bioreactor 3 contains CLR-resistant nitrifying bacteria and denitrifying Acinetobacter bacilli.

[0048] CLR-resistant nitrifying bacteria can survive and remain active in environments containing clarithromycin, reducing the inhibition of the nitrification process by antibiotics. In membrane bioreactors, CLR-resistant nitrifying bacteria convert ammonia nitrogen into nitrate, while denitrifying Acinetobacter converts nitrate into nitrogen gas, achieving complete nitrogen removal. The combination of these two types of bacteria can increase the microbial diversity in the membrane bioreactor, improve system stability and resistance to shock loads, and is suitable for the treatment of medical wastewater containing antibiotics and high ammonia nitrogen.

[0049] More specifically, the porosity of the carrier filling the membrane bioreactor 3 is 90-95%, and the pore size distribution is 50-200 μm.

[0050] The membrane bioreactor has an effective volume of at least 2 m³, filled with a polyurethane carrier. With a pore size distribution of 90-95%, the high porosity provides a larger specific surface area, which is beneficial for microbial attachment and growth, enhancing biofilm activity and thus improving the degradation efficiency of organic pollutants and ammonia nitrogen. Simultaneously, the pore size distribution of 50-200 μm effectively traps suspended solids and microorganisms, preventing membrane fouling and extending membrane lifespan. Furthermore, this configuration promotes sufficient contact between wastewater and microorganisms, optimizing mass transfer efficiency and improving the overall treatment effect of medical wastewater.

[0051] More specifically, the photocatalytic unit is a ring-shaped LED array light source, which is used to irradiate the wastewater to be treated in the mineralization tank 4. The Z-shaped heterojunction photocatalyst is coated on the surface of a quartz glass tube, and the quartz glass tube is immersed in the wastewater to be treated.

[0052] In the process of medical wastewater treatment, the ring-shaped LED array light source provides uniform and efficient illumination. The LED array light source, Huacan Optoelectronics HC50W-450B LED lamp, has a maximum light intensity of 150mW / cm² and a wavelength range of 430-470nm. It uses a Z-type heterojunction photocatalyst to generate strong oxidizing active substances such as hydroxyl radicals, which effectively degrades difficult-to-treat trace pollutants such as antibiotics in wastewater. The method of coating the quartz glass tube with the Z-type heterojunction photocatalyst and immersing it in the wastewater ensures that the catalyst is in full contact with the wastewater, thereby improving the efficiency of the photocatalytic reaction. The coating thickness of the quartz glass tube is 50±5μm.

[0053] Meanwhile, the mineralization pool is also equipped with a catalyst recovery device, which uses one or more of iron tetroxide and biochar.

[0054] More specifically, a first flow control device 5 is provided between the output end of the bioreactor 2 and the input end of the membrane bioreactor 3, a second flow control device 6 is provided between the output end of the membrane bioprojector and the input end of the mineralization tank 4, and a third flow control device 7 is provided at the output end of the mineralization tank 4.

[0055] In this scheme, the first flow control device is used to control the flow rate of wastewater treated in the bioreactor entering the membrane bioreactor, the second flow control device is used to control the flow rate of wastewater treated in the membrane bioreactor entering the mineralization tank, and the third flow control device is used to control the flow rate of wastewater treated in the mineralization tank flowing out. Through the coordinated work of the first flow control device, the second flow control device and the third flow control device, the flow balance between each unit can be achieved, ensuring the continuous and stable operation of the system.

[0056] The first, second, and third flow control devices here are water pumps or check valves.

[0057] More specifically, it also includes a PID controller, which is electrically connected to the membrane bioreactor 3, pH monitor, redox potential monitor, ring LED array light source, first flow control device 5, second flow control device 6 and third flow control device 7.

[0058] By setting the PID controller, the entire system can operate intelligently, dynamically adjusting the operating parameters of the bioreactor and membrane bioreactor to ensure microbial activity and treatment efficiency, optimize catalytic conditions, and improve the treatment efficiency of medical wastewater.

[0059] More specifically, it also includes a first timer, a second timer, and a third timer, all of which are electrically connected to the PID controller.

[0060] The first timer is used to detect the reaction time of medical wastewater in the biological reactor, the second timer is used to detect the reaction time of medical wastewater in the membrane bioreactor, and the third timer is used to detect the reaction time of medical wastewater in the mineralization tank. The PID controller is used to acquire the timing data of the first, second, and third timers. The reaction time of medical wastewater can be adjusted by using the timing data of each timer, thereby improving the medical wastewater treatment efficiency per unit time.

[0061] More specifically, it also includes a PWM dimming controller, wherein the LED array light source, the PWM dimming controller, and the PID controller are electrically connected in sequence.

[0062] The PID controller outputs a control signal to the PWM dimming controller, which then controls the light intensity of the LED array light source according to the control signal. By controlling the light intensity, the reaction rate of the wastewater in the mineralization tank is controlled, achieving a power density of ≥100mW / cm², which can improve the efficiency of medical wastewater treatment per unit time.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A medical wastewater treatment system based on antibiotic regulation and multi-stage photocatalysis, characterized in that, The application relates to a sewage treatment device. The pre-treatment unit (1) comprises stainless steel screens for residue filtration of sewage to be treated. The adjusting tank comprises a biological reaction tank (2), a membrane biological reactor (3) and a mineralization tank (4) in sequence. The biological reaction tank (2) is used for reaction of sewage to be treated with antibiotics, the antibiotics being clarithromycin and nitrosomonas; the membrane biological reactor (3) is used for organic matter degradation of sewage to be treated; and the mineralization tank (4) is used for photocatalytic reaction of sewage to be treated. The mineralization tank (4) is provided with a photocatalytic unit and a catalyst, and the catalyst is a Z-type heterojunction photocatalyst. The pre-treatment unit (1) comprises three stainless steel screens, namely an 80-mesh screen (101), a 200-mesh screen (102) and a 300-mesh screen (103), and the sewage to be treated passes through the three stainless steel screens in sequence. The biological reaction tank (2) is further provided with a pH monitor and an oxidation-reduction potential monitor, the pH monitor is used for monitoring the pH value of the solution in the biological reaction tank (2), and the oxidation-reduction potential monitor is used for monitoring the oxidation-reduction potential of the solution in the biological reaction tank (2).

2. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 1, characterized in that, The membrane biological reactor (3) is provided with CLR-resistant nitrifying bacteria and denitrifying acinetobacter.

3. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 1, characterized in that, The porosity of the carrier filled in the membrane biological reactor (3) is 90-95%, and the pore size distribution is 50-200 mu m.

4. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 1, characterized in that, The photocatalytic unit is a ring-shaped LED array light source used for irradiating sewage to be treated in the mineralization tank (4), the Z-type heterojunction photocatalyst is coated on the surface of a quartz glass tube, and the quartz glass tube is immersed in the sewage to be treated.

5. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 4, characterized in that, A first flow control device (5) is arranged between the output end of the biological reaction tank (2) and the input end of the membrane biological reactor (3), a second flow control device (6) is arranged between the output end of the membrane biological reactor and the input end of the mineralization tank (4), and a third flow control device (7) is arranged at the output end of the mineralization tank (4).

6. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 1, characterized in that, The PID controller is electrically connected with the membrane biological reactor (3), the pH monitor, the oxidation-reduction potential monitor, the ring-shaped LED array light source, the first flow control device (5), the second flow control device (6) and the third flow control device (7).

7. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 6, characterized in that, The first timer, the second timer and the third timer are electrically connected with the PID controller.

8. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 7, characterized in that, The LED array light source, the PWM light control controller and the PID controller are electrically connected in sequence.

9. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 8, characterized in that, ​ 10. The medical wastewater treatment system based on the regulation of antibiotics and multi-stage photocatalysis according to claim 9, characterized in that, ​

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