Zero-discharge treatment process for cephalosporin pharmaceutical wastewater

Abstract

The invention relates to the technical field of pharmaceutical wastewater treatment, and discloses a cephalosporin pharmaceutical wastewater zero-discharge treatment process which comprises the following steps: S1, pretreating high-concentration and high-salinity wastewater generated in cephalosporin pharmacy; s2, carrying out supernormal oxidation treatment on the pretreated wastewater, and oxidizing organic pollutants which are difficult to degrade in the wastewater through chemical reaction; and S3, salt recovery and recycling are conducted on the mixture obtained after oxidation treatment. The zero-discharge treatment process for the cephalosporin pharmaceutical wastewater, provided by the invention, combines overtemperature oxidation and normal-temperature oxidation, can efficiently degrade complex carbon-containing, nitrogen-containing and phosphorus-containing organic matters in the cephalosporin wastewater, and adapts to the volatility of wastewater components in different batches; and the treated saline water can be used in the cephalosporin pharmaceutical process and other industrial production activities after being specially treated, so that the purposes of maximum utilization of resources and environmental protection are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of pharmaceutical wastewater treatment, and in particular to a zero-discharge treatment process for cephalosporin pharmaceutical wastewater. Background Art

[0002] Cephalosporin antibiotics are a class of broad-spectrum β-lactam antibiotics that are widely used to treat a variety of infections caused by Gram-positive and Gram-negative bacteria. They exert their antibacterial effects by inhibiting bacterial cell wall synthesis. Cephalosporin antibiotics are divided into several generations according to their chemical structure and antibacterial spectrum.

[0003] Existing technologies face many challenges and deficiencies in treating cephalosporin pharmaceutical wastewater, which are specifically manifested in the following aspects:

[0004] 1. High salt content hinders biochemical treatment: Cephalosporin wastewater contains extremely high salt content such as sodium chloride and sodium sulfate, which seriously affects the activity and living environment of microorganisms, making traditional biochemical treatment processes almost impossible to be effectively applied. High salinity not only inhibits the metabolic activity of microorganisms, but also may cause corrosion to treatment equipment, increasing maintenance costs;

[0005] 2. Complex organic composition and high volatility: The organic composition of this type of wastewater is extremely complex and highly volatile. In addition to carbon-containing organic matter, it also contains a large amount of nitrogen-containing and phosphorus-containing compounds. This diversity makes it difficult to cope with a single treatment method, and a combination of multiple technical means is required to achieve the ideal treatment effect. In addition, the wastewater composition between different production batches varies significantly, which further increases the difficulty of treatment;

[0006] 3. Difficulty in degrading organic matter: Cephalosporins and their synthetic intermediates and by-products are difficult to degrade. Conventional oxidation technologies such as ozone oxidation and Fenton reagent have low removal efficiency and are difficult to completely decompose these substances. This not only affects the treatment effect, but may also lead to residual antibiotics and other harmful substances in the environment, increasing ecological risks.

[0007] 4. Lack of unified standards and poor process adaptability: Since cephalosporin wastewater is not a final product, its discharge standard is unclear. Each company formulates different treatment plans according to its own situation. Moreover, changes in production processes will lead to completely different components of wastewater pollutants. The quality of wastewater produced by different companies of the same type also varies greatly. This uncertainty brings great challenges to wastewater treatment, requiring the treatment process to be highly flexible and adaptable;

[0008] 5. Evaporation has limited reduction effect and is difficult to operate: Although evaporation is a commonly used concentration reduction method, for cephalosporin wastewater with high concentration of organic matter and high salinity, evaporation equipment is prone to clogging and unstable operation. In addition, the hazardous waste generated during the evaporation process has complex components and high treatment costs, which limits its widespread application;

[0009] 6. High energy consumption and operating costs: Currently, most cephalosporin wastewater treatment relies on outsourcing hazardous waste treatment or incineration. Although these two methods can effectively reduce pollutants, they consume extremely high energy and have huge operating costs. Especially for small and medium-sized enterprises, the high treatment costs have become a heavy burden, affecting the sustainable development of the enterprises.

[0010] In summary, the existing treatment technology is inadequate when dealing with cephalosporin pharmaceutical wastewater. It is urgent to develop more efficient, economical and environmentally friendly new technologies and processes to meet increasingly stringent environmental protection requirements and maximize the use of resources. Summary of the invention

[0011] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a zero-discharge treatment process for cephalosporin pharmaceutical wastewater.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A zero-discharge treatment process for cephalosporin pharmaceutical wastewater comprises the following steps:

[0014] S1: Pre-treatment of high-concentration and high-salt wastewater produced by cephalosporin pharmaceutical production;

[0015] S2: Perform super-normal oxidation treatment on the pre-treated wastewater to oxidize the difficult-to-degrade organic pollutants in the wastewater through chemical reactions;

[0016] S3: recovering and recycling salt from the mixture after oxidation treatment.

[0017] As a preferred technical solution of the present invention, the pretreatment includes: filtration stage: using a filter to remove large particles of solid suspended matter to prevent subsequent equipment from being blocked; pH value adjustment: adjusting the acidity and alkalinity of the wastewater according to the requirements of subsequent treatment to ensure a suitable chemical reaction environment; water quality homogenization: stirring the wastewater with an agitator to reduce the impact of water quality fluctuations on subsequent treatment units.

[0018] As a preferred technical solution of the present invention, in step S2, the supernormal oxidation treatment includes: super-temperature oxidation treatment: passing the wastewater into a super-temperature oxidation reactor, performing deep oxidation treatment on the wastewater, and decomposing complex and difficult-to-degrade organic compounds; normal temperature oxidation treatment: passing the wastewater after the super-temperature oxidation treatment into a normal temperature oxidation reactor, and introducing ozone, using the strong oxidizing property of ozone to effectively degrade the remaining difficult-to-degrade organic matter, thereby improving the effluent water quality.

[0019] As a preferred technical solution of the present invention, in the super-temperature oxidation treatment, the internal temperature of the reactor is set to 150-280°C, the pressure is set to 3-8MPa, and the residence time is set to 30-100min.

[0020] As a preferred technical solution of the present invention, a heat recovery system is arranged between the over-temperature oxidation treatment and the normal-temperature oxidation treatment to recover the heat energy in the fluid after the over-temperature oxidation treatment.

[0021] As a preferred technical solution of the present invention, membrane coupling technology is integrated into the room temperature oxidation treatment to improve the utilization rate of hydroxyl radicals through membrane coupling.

[0022] As a preferred technical solution of the present invention, in the step S1, salt recovery and resource utilization include: high-purity salt: treating and refining the liquid after oxidation treatment to obtain high-purity salt, and applying the high-purity salt to the preparation process of cephalosporin drugs; brine: adjusting the concentration and component ratio parameters of the brine according to the needs of cephalosporin drug production to make it meet the requirements of the production process; by-product salt: classifying and quality testing the extracted salt, distinguishing high-purity salt from by-product salt, and applying the by-product salt to the field of industrial production.

[0023] As a preferred technical solution of the present invention, a preheating treatment stage is set before step S2. In the preheating treatment stage, the wastewater is passed into a preheater to increase its temperature, and then passed into an over-temperature oxidation treatment stage after preheating.

[0024] As a preferred technical solution of the present invention, in the preheating treatment stage, the heat source of the preheater adopts the thermal energy in the fluid after the super-temperature oxidation treatment.

[0025] The present invention has the following beneficial effects:

[0026] 1. Efficiently remove high salt content and break through the limitations of biochemical treatment: Deep oxidation under high temperature and high pressure and oxidation treatment at room temperature can effectively decompose complex and difficult-to-degrade organic compounds without being affected by high salt content, thus solving the problem that traditional biochemical treatment cannot cope with high-salinity wastewater;

[0027] 2. Dealing with complex and changeable organic components: Combining ultra-temperature oxidation and room-temperature oxidation, and using a variety of strong oxidation methods, it can efficiently degrade complex carbon-containing, nitrogen-containing, and phosphorus-containing organic matter in cephalosporin wastewater, and adapt to the volatility of wastewater components in different batches;

[0028] 3. Membrane coupling technology: Incorporating membrane coupling technology into room temperature oxidation improves the efficiency of the oxidation reaction, further removes small molecular organic matter and soluble salts, and ensures that the effluent quality is stable and meets the standards;

[0029] 4. Reduce energy consumption and operating costs: A heat recovery system is set between super-temperature oxidation and normal temperature oxidation to recycle waste heat from high-temperature carbon dioxide and other fluids, which not only reduces the energy consumption of the entire plant, but also improves resource utilization;

[0030] 5. Improve reaction efficiency: preheat the oxygen introduced through a double-layer tube heater, and set up a preheater to preheat the wastewater, which reduces the initial heating energy required by the reactor itself, further reduces the overall energy consumption, and extends the service life of the equipment. At the same time, the heat used for preheating comes from the over-temperature treatment link, which realizes the effective use of waste heat and reduces the cost of wastewater treatment;

[0031] 6. Significant environmental benefits: Cephalosporin pharmaceutical wastewater is treated by this process to obtain brine, which is specially treated. A portion of the high-purity salt or brine with specific conditions can be used in the cephalosporin pharmaceutical production process, and the other by-product salt can be used in other industrial production, achieving the goal of maximizing resource utilization and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a flow chart of a zero-discharge treatment process for cephalosporin pharmaceutical wastewater proposed by the present invention;

[0033] Figure 2 It is a schematic diagram of the super-temperature oxidation section and the normal temperature oxidation section. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Reference Figure 1 and Figure 2 A zero-discharge treatment process for cephalosporin pharmaceutical wastewater comprises the following steps:

[0036] S1: Pre-treatment of high-concentration and high-salt wastewater produced by cephalosporin pharmaceutical production;

[0037] S2: Perform super-normal oxidation treatment on the pre-treated wastewater to oxidize the difficult-to-degrade organic pollutants in the wastewater through chemical reactions;

[0038] S3: recovering and recycling salt from the mixture obtained after oxidation treatment.

[0039] The pre-processing comprises:

[0040] Filtration stage: Use filters to remove large solid suspended matter to prevent subsequent equipment from clogging;

[0041] pH adjustment: adjust the pH of wastewater according to the subsequent treatment requirements to ensure a suitable chemical reaction environment;

[0042] Water homogenization: The wastewater is stirred by an agitator to stabilize the water quality and reduce the impact of fluctuations on subsequent treatment units. This helps maintain the stable operation of the system and avoids the impact of sudden changes in water quality on the treatment effect.

[0043] Dosage of pretreatment agent: Addition of demulsifier. If the wastewater contains emulsified oil or other difficult-to-separate substances, an appropriate amount of demulsifier can be added to destroy the emulsified state to facilitate subsequent separation; flocculation and sedimentation: Adding flocculants causes fine particles to aggregate to form larger particles, which are easy to settle or filter. Commonly used flocculants are polyaluminium chloride (PAC), polyacrylamide (PAM), etc.

[0044] Extraordinary oxidation treatments include:

[0045] Super-temperature oxidation treatment: The wastewater is passed into the super-temperature oxidation reactor for deep oxidation treatment to decompose complex and difficult-to-degrade organic compounds. The organic matter in the wastewater undergoes a violent oxidation reaction with oxygen under high temperature and high pressure conditions to achieve effective treatment of the wastewater. During the super-temperature oxidation treatment stage, the internal temperature of the reactor is set at 150-280°C. Considering the complexity and difficulty of cephalosporin wastewater, higher temperatures can promote more thorough decomposition of organic matter. The pressure is set to 3-8MPa, which can ensure sufficient safety while maintaining efficient oxidation reaction conditions. The residence time is set to 30-100min, and the gas supply is determined based on the theoretical oxygen demand (ThOD) of the organic matter in the wastewater to ensure that sufficient oxygen is provided to support complete oxidation while avoiding excessive oxygen supply and waste of resources.

[0046] Furthermore, after over-temperature oxidation treatment, cephalosporin pharmaceutical wastewater is separated into carbon dioxide and other fluids with a relatively high temperature. The high-temperature carbon dioxide is directly introduced into other equipment in the factory that requires heating for heat energy utilization. A heat recovery system is set between the over-temperature oxidation and normal-temperature oxidation stages to recover heat energy from other fluids in the over-temperature state. Such a design realizes the effective reuse of waste heat and reduces the energy consumption of the entire factory. Furthermore, the heat recovery system includes a heat exchanger and a control system. The control system includes temperature sensors, flow meters, automatic regulating valves and other components for monitoring and controlling the entire heat recovery process to ensure safe and efficient operation.

[0047] Furthermore, a preheater is provided before the super-temperature oxidation treatment stage, and the wastewater is preheated before entering the super-temperature oxidation treatment stage, wherein the heat source of the preheater comes from the waste heat of the super-temperature stage, specifically, high-temperature gas recovery, the high-temperature carbon dioxide gas discharged from the super-temperature oxidation reactor is transported to one side of the preheater through a pipeline to heat the wastewater in the preheater; wastewater waste heat recovery: heat is extracted from the wastewater after super-temperature oxidation through a heat exchanger, and the heat is transferred to the wastewater that is about to enter the super-temperature oxidation stage, so that the heat energy generated in the super-temperature oxidation stage can be fully utilized to achieve high resource utilization. This design can increase the reaction rate: preheating makes the wastewater at a higher temperature when it enters the reactor, which helps to accelerate the oxidation and decomposition of organic matter and shorten the reaction time; reduce energy consumption: since the wastewater has reached a higher temperature in the preheating stage, the initial heating energy required to be provided by the reactor itself is reduced, thereby reducing the overall energy consumption; improve reaction conditions: preheating helps to ensure that the wastewater enters the reactor at a relatively constant temperature, avoids the adverse effects caused by temperature fluctuations, and maintains the stability of the reaction conditions; protect equipment: prevent temperature shock, reduce the impact of thermal stress inside the equipment, and extend the service life of the equipment.

[0048] Furthermore, in the super-temperature oxidation treatment stage, a heater is arranged between the pipe for introducing oxygen and the super-temperature oxidation reactor. Specifically, the heater is a double-layer tube heater, and the specific structure is divided into an inner tube, an outer tube and an insulation layer. The inner tube is used to introduce the oxygen to be preheated. One end of the inner tube is connected to the oxygen supply source, and the other end is directly connected to the super-temperature oxidation reactor. The outer tube wraps the inner tube, and the outer tube and the inner tube are used to introduce a medium carrying the heat generated in the super-temperature oxidation treatment stage. The insulation layer is wrapped on the outside of the outer tube. Commonly used insulation materials include rock wool, aluminum silicate fiber, etc., which reduce heat loss. The double-layer tube heater adopts a spiral structure as a whole, which prolongs its heating time for oxygen and improves the overall energy efficiency. Furthermore, a countercurrent arrangement is adopted, that is, oxygen flows in from one end, and the heat exchange medium flows in from the other end, and the two flow in opposite directions to ensure sufficient heat transfer. Under this design, preheating ensures that the oxygen is already at a higher temperature when it enters the reactor, which helps to accelerate the oxidative decomposition of organic matter and shorten the reaction time. Secondly, the higher initial temperature can promote the generation of more free radicals, thereby more thoroughly oxidizing difficult-to-degrade organic matter and ensuring the uniformity and thoroughness of the reaction.

[0049] Normal temperature oxidation treatment: The wastewater after the super-temperature oxidation treatment is passed into the normal temperature oxidation reactor and ozone is introduced. The strong oxidizing property of ozone can effectively degrade the remaining difficult-to-degrade organic matter and improve the effluent water quality. The process includes the following steps:

[0050] Pretreatment and adjustment: Before the wastewater after super-temperature oxidation is introduced into the normal temperature oxidation stage, it is usually necessary to perform certain pretreatment and adjustment, specifically: pH value adjustment. According to the requirements of the subsequent oxidation reaction, the pH value of the wastewater may need to be adjusted to an appropriate range to optimize the oxidation effect of ozone. Generally, a neutral or slightly alkaline environment is more favorable; temperature control to ensure that the wastewater temperature is moderate to avoid excessively high or low temperatures that affect the solubility and reaction efficiency of ozone;

[0051] Ozone generator produces ozone: air or oxygen is converted into ozone gas by an ozone generator. Specifically, the ozone generator uses corona discharge, ultraviolet irradiation and other methods to generate high-concentration ozone gas, and the generated ozone is then fed into the reaction system;

[0052] Ozone introduction and mixing: ozone gas is introduced into the reaction vessel containing wastewater and ensured to be fully mixed. Specifically, a gas-liquid contact tower or other types of gas-liquid mixing devices are used to make the ozone gas fully contact with the wastewater. Commonly used devices include aeration tanks, packed towers, venturi tubes, etc. Furthermore, a microporous aeration head is used to evenly disperse the ozone gas into the wastewater to increase the bubble surface area and promote the dissolution and reaction of ozone;

[0053] Oxidation reaction: Under normal temperature conditions, ozone reacts with organic pollutants in wastewater to produce carbon dioxide, water and other harmless substances. Ozone has a very strong oxidizing ability and can quickly decompose a variety of organic compounds in a short period of time. Compared with other chemical oxidants, the main by-product after the ozone reaction is oxygen, which is environmentally friendly. This design can completely remove residual organic pollutants in wastewater after overheating treatment;

[0054] Tail gas treatment: Incompletely reacted ozone and other volatile gases need to be treated before being discharged. Specifically, install tail gas destruction devices, such as ultraviolet lamps, heated catalyst beds, etc., to decompose unreacted ozone into oxygen. During the treatment process using the heated catalyst bed, the heat energy used to heat the catalyst is the waste heat generated in the super-temperature oxidation treatment stage. Furthermore, the oxygen decomposed from the ozone produced in this stage is introduced into the super-temperature oxidation stage. This can improve energy utilization and reduce wastewater treatment costs.

[0055] Furthermore, carbon dioxide is produced in both the super-temperature oxidation treatment stage and the room-temperature oxidation treatment stage. Carbon dioxide is separated from the exhaust gas flow by carbon capture technology. The captured carbon dioxide can be used for industrial purposes such as food-grade carbon dioxide, carbonated beverage filling, enhanced oil recovery in oil extraction, etc., thereby improving the environmental protection of wastewater treatment and maximizing the utilization of resources.

[0056] Furthermore, membrane coupling technology is incorporated into room temperature oxidation treatment. Specifically, the membrane assembly is installed and integrated into the room temperature oxidation treatment system. The membrane assembly includes a nanofiltration or reverse osmosis membrane for removing small molecular organic matter and soluble salts, which is particularly suitable for high-concentration and high-salt wastewater. It also includes a ceramic membrane or a composite membrane with higher chemical stability and corrosion resistance, which is suitable for strong oxidizing environments. Subsequently, strong oxidizing hydroxyl radicals are generated on the membrane surface by specific means to enhance the oxidation effect. The specific methods are: photocatalytic membrane, a membrane coated with a photocatalyst such as TiO2, which produces hydroxyl radicals under ultraviolet light; electrochemical membrane, by applying an electric field, electrolyzing water on the membrane surface to generate hydroxyl radicals; persulfate activation, adding persulfate and activating it on the membrane surface to generate hydroxyl radicals. Through the above measures, an efficient oxidation reaction area is formed on the membrane surface, which significantly improves the degradation ability of organic pollutants. Finally, the wastewater after oxidation treatment is separated by nanofiltration or reverse osmosis membrane to achieve separation of purified water and concentrated liquid. The purified water that passes through the membrane is disinfected, such as chlorination, ultraviolet irradiation, etc., to ensure water quality safety and further remove possible trace suspended matter or particles so that the water quality meets the reuse or discharge standards. The concentrated liquid is recycled.

[0057] Resource recycling: Special treatment is performed on the liquid after oxidation treatment to achieve the purpose of salt recovery and resource utilization, including:

[0058] 1. The preparation of high-purity salt includes:

[0059] Evaporation crystallization: using a multiple-effect evaporator or multi-stage flash evaporation technology to gradually evaporate the water in the concentrate, leaving solid salts. Specifically, the multiple-effect evaporator uses multiple evaporation chambers in series, and the pressure in each evaporation chamber gradually decreases, so that the steam can be used step by step to improve energy efficiency; mechanical vapor recompression system: using a compressor to compress and heat the secondary vapor generated by evaporation and then use it again to heat the original liquid, significantly reducing the demand for external heat sources;

[0060] Ion exchange and purification: Use ion exchange resins to remove specific ions, such as heavy metal ions or other harmful substances, to improve the purity of salts. Specifically, select appropriate ion exchange resins based on target ions to ensure efficient removal of impurities; regenerate the resins regularly to restore their exchange capacity and collect adsorbed impurities;

[0061] Solid-liquid separation: solid-liquid separation is achieved through a centrifuge or filter press to obtain dry solid salt. Among them, centrifugal separation is suitable for crystalline salt with larger particles and has higher separation efficiency. Filter press separation is for fine crystals or viscous liquids, and filter press can provide better separation effect;

[0062] Refining process: specifically including: recrystallization, further purifying the salt product through dissolution, cooling crystallization and other steps to remove trace impurities; washing, cleaning the crystal surface with pure water or solvent to remove attached impurities. Through further refining process, high-purity salt products can be prepared, which are suitable for medicinal or other high-demand fields.

[0063] 2. The preparation of saline solution under specific conditions includes:

[0064] Ingredient adjustment: According to the needs of cephalosporin drug production, adjust the concentration, ingredient ratio and other parameters of the brine to ensure that it meets the requirements of the production process. Specifically, use dilution and concentration technology to adjust the brine concentration by adding pure water or continuing evaporation and concentration. Secondly, mix the ingredients and add necessary additives, such as buffers, stabilizers, etc., to ensure the chemical stability of the brine.

[0065] Quality control: strictly monitor the quality indicators of brine to ensure that it meets the pharmaceutical standards. Specifically, online monitoring: install automated water quality monitoring equipment to detect key parameters such as pH, conductivity, and total organic carbon (TOC) in real time; laboratory analysis: regularly take samples and send them to the laboratory for detailed chemical analysis to verify the quality of the brine.

[0066] The high-purity salt or salt water under complex conditions prepared through the above steps can be applied to the preparation process of cephalosporin drugs, thereby improving the utilization rate of resources.

[0067] 3. Application of by-product salt

[0068] Classification and testing: The extracted salt is classified and quality tested to distinguish between high-purity salt and by-product salt. The specific monitoring methods include: physical testing, which evaluates the physical properties of the salt through particle size analysis, density measurement and other means; chemical testing, which uses ICP-OES, XRF and other instruments to analyze the chemical composition of the salt to ensure safety and applicability.

[0069] The extracted by-product salts are applied to industrial production, such as:

[0070] Chemical industry: as the basic raw material for producing chlor-alkali, sodium sulfate and other chemicals;

[0071] Printing and dyeing industry: as a dyeing auxiliary, it helps fix dyes and improve dyeing effects;

[0072] Glass manufacturing industry: as a clarifier or stabilizer to improve the quality of glass products.

[0073] Through the above-mentioned resource recovery process, not only can high-purity salt and brine under specific conditions be extracted from cephalosporin pharmaceutical wastewater for the preparation of cephalosporin drugs, but also the by-product salt can be reasonably utilized to achieve the goals of maximizing resource utilization and protecting the environment.

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater, characterized in that: The following steps are involved: S1: Pre-treatment of high-concentration and high-salt wastewater produced by cephalosporin pharmaceutical production; S2: Perform super-normal oxidation treatment on the pre-treated wastewater to oxidize the difficult-to-degrade organic pollutants in the wastewater through chemical reactions; S3: recovering and recycling salt from the mixture after oxidation treatment.

2. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 1, characterized in that: The pre-processing comprises: Filtration stage: Use filters to remove large solid suspended matter to prevent subsequent equipment from clogging; pH adjustment: adjust the pH of wastewater according to the subsequent treatment requirements to ensure a suitable chemical reaction environment; Water homogenization: wastewater is stirred by an agitator to reduce the impact of water quality fluctuations on subsequent treatment units.

3. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 1, characterized in that: In step S2, the super-oxidation treatment includes: Super-temperature oxidation treatment: The wastewater is passed into the super-temperature oxidation reactor to perform deep oxidation treatment on the wastewater to decompose complex and difficult-to-degrade organic compounds; Normal temperature oxidation treatment: The wastewater after super-temperature oxidation treatment is passed into a normal temperature oxidation reactor, and ozone is introduced. The strong oxidizing property of ozone is used to effectively degrade the remaining difficult-to-degrade organic matter and improve the effluent quality.

4. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 3, characterized in that: In the super-temperature oxidation treatment, the internal temperature of the reactor is set to 150-280° C., the pressure is set to 3-8 MPa, and the residence time is set to 30-100 min.

5. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 3, characterized in that: A heat recovery system is arranged between the over-temperature oxidation treatment and the normal-temperature oxidation treatment to recover and utilize the heat energy in the fluid after the over-temperature oxidation treatment.

6. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 3, characterized in that: In the room temperature oxidation treatment, the oxygen generated after the incompletely reacted ozone is treated is introduced into the super-temperature oxidation reactor to realize the utilization of resources.

7. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 3, characterized in that: The membrane coupling technology is incorporated into the room temperature oxidation treatment to improve the utilization rate of hydroxyl radicals through the membrane coupling effect.

8. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 1, characterized in that: In step S1, salt recovery and resource utilization include: High-purity salt: The liquid after oxidation treatment is treated and refined to obtain high-purity salt, which is applied to the preparation process of cephalosporin drugs; Saline: According to the production requirements of cephalosporin drugs, the concentration and component ratio parameters of saline are adjusted to meet the requirements of the production process; By-product salt: Classify and test the quality of the extracted salt, distinguish between high-purity salt and by-product salt, and apply the by-product salt to industrial production.

9. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 5, characterized in that: A preheating treatment stage is provided before step S2. In the preheating treatment stage, the wastewater is passed into a preheater to increase its temperature, and then passed into an over-temperature oxidation treatment stage after preheating.

10. A zero-discharge treatment process for cephalosporin pharmaceutical wastewater according to claim 9, characterized in that: In the preheating stage, the heat source of the preheater adopts the thermal energy in the fluid after the super-temperature oxidation treatment.

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