Improved medical sewage treatment zero discharge method and system

Abstract

The invention relates to the technical field of medical sewage treatment, in particular to an improved medical sewage treatment zero-emission method and system. Medical sewage is pretreated in advance, so that the medical sewage is input into an activated sludge tank to be subjected to sludge treatment, medical clear water and sludge are obtained after the medical sewage is treated in the activated sludge tank, and the medical clear water is input into a disinfection tank; the flow rate of medical clear water, the variety and number of pathogens, organic matters in sewage, ammonia nitrogen concentration, temperature and illumination are combined to determine the content of a disinfectant and determine the dosage of the disinfectant, so that the medical clear water is accurately disinfected, the adaptability of disinfection is improved, and then whether the medical clear water reaches the zero emission standard or not is judged through sampling inspection after disinfection, and the medical clear water can be accurately disinfected. Therefore, the purification and disinfection efficiency of the medical sewage at present is improved, the disinfected discharge water can be used as hospital flushing water, the flushing water containing the disinfectant can remove the odor of the toilet, the pollution of fecal water and the treatment cost are further reduced, and the scale formation of the toilet is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical sewage treatment, and in particular to an improved medical sewage treatment zero-discharge method and system. Background Art

[0002] With the acceleration of industrialization and urbanization, water shortage and pollution problems are becoming increasingly serious. In particular, in high-pollution industries such as medical and chemical industries, sewage discharge poses a particularly prominent threat to the environment. In order to meet this challenge, achieving "zero discharge" of sewage has become an important goal in the field of environmental protection. The zero-discharge sewage treatment system not only helps to reduce pollution, but also reduces the water pressure of enterprises and society by recycling water resources, thereby promoting sustainable development.

[0003] Among them, zero discharge of sewage treatment means that after a series of treatment processes, the sewage is not directly discharged to the outside world, but is completely purified and reused, ultimately achieving the goal of "no liquid discharge". In this process, not only the pollutants in the wastewater are required to be effectively treated, but also the treated water must be recycled and reused, and the solid waste must be safely disposed of or recycled.

[0004] However, at present, when treating medical wastewater, there is no precise control of the treatment steps, such as the adaptive setting of the disinfectant dosage and the effective disinfection process of the disinfection tank after the disinfectant is added. Therefore, in order to achieve more refined zero discharge of medical wastewater, the present invention proposes an improved medical wastewater treatment zero discharge method and system. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an improved zero-discharge method and system for medical wastewater treatment, which can effectively solve the problems in the prior art involving precise control of treatment steps, affecting the accuracy and efficiency of zero-discharge medical wastewater treatment.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides an improved zero-discharge method and system for medical wastewater treatment, comprising the following steps:

[0008] Step 1: Pre-treat medical wastewater to remove particulate pollutants and suspended solids in medical wastewater;

[0009] Step 2: The treated medical sewage is input into the regulating tank to balance the pH value and organic matter concentration of the water quality of the medical sewage;

[0010] Step 3: Input the medical sewage into an activated sludge tank to continuously aerate the medical sewage to maintain oxygen supply, so that pollutants in the medical sewage are in close contact with microorganisms for degradation, and input the treated medical sewage into a sedimentation tank to separate sludge and clean water from the medical sewage, and obtain treated medical clean water by separating sewage and clean water;

[0011] Step 4: Disinfect the treated medical water, wherein the disinfection method and steps are as follows:

[0012] Medical clean water is input into the disinfection pool;

[0013] Determine the disinfectant content; specifically, combine the flow rate of medical clean water, the type and quantity of pathogens, organic matter in sewage, ammonia nitrogen concentration with temperature and light to determine the disinfectant content and clarify the dosage of disinfectant;

[0014] Disinfectant is evenly distributed;

[0015] Sampling and testing of disinfectant concentration;

[0016] Step 5: After the medical clean water is disinfected, collect the medical clean water and make a judgment to determine whether the disinfection is completed and the discharge index is reached. If the disinfection is completed and the discharge index is reached, a discharge signal is generated, otherwise no signal is generated.

[0017] Furthermore, the removal of particulate pollutants and suspended matter is specifically performed through a grid or a screen.

[0018] Furthermore, after the medical sewage is input into the activated sludge tank, the amount of aged sludge to be discharged is determined, and the calculation formula for the amount of aged sludge discharged is as follows:

[0019] Calculate the total amount of sludge in the activated sludge tank

[0020] X=V×MLSS

[0021] Where: X is the total amount of sludge, V is the volume of the aeration tank, and MLSS is the sludge concentration in the aeration tank;

[0022] Determine the amount of sludge to be discharged daily:

[0023]

[0024] In the formula, Q p is the amount of aged sludge that needs to be discharged daily, and SRT is the sludge age.

[0025] Further, the method for determining the disinfectant content is:

[0026] Determine the state influence coefficient ChlZ A :

[0027]

[0028] Where Qm is the flow rate of medical clean water, C patfebs is the concentration of pathogens in medical water, Bj ods is the biochemical oxygen demand in medical water, N mg is the ammonia nitrogen concentration in medical water, CQB is the number of calculation items, β1, β2, β3 and β4 are the corresponding weight coefficients, Cβx is the constant correction coefficient, where;

[0029] Determine the environmental impact factor Chod B :

[0030]

[0031] Where: T pcs is the ambient temperature, Lj ux is the light intensity, and is the weight coefficient, is the constant correction coefficient, TLC is the number of calculation items;

[0032] Determine the actual impact coefficient of Chlorids:

[0033]

[0034] Where: ω1 and ω2 are the corresponding weight coefficients, CCH is the number of calculation items, is the constant correction factor;

[0035] Based on the actual influence coefficient Chlorids, the corresponding disinfectant content matching interval is obtained to obtain the disinfectant content, that is, the dosage of chlorine.

[0036] When performing uniform distribution of disinfectant, chlorine is placed in the chlorine disinfection tank and mixed by a hydraulic mixer to calculate the mixing time. The total time is calculated according to the following relationship:

[0037]

[0038] Where: t mix is the mixing time, V is the effective volume of the chlorine disinfection tank, μ is the mixing efficiency coefficient, and μ takes a value of 1.2 to 2, which is used to adjust the actual mixing effect.

[0039] Furthermore, the disinfectant concentration sampling test determines the uniform distribution of chlorine in the chlorine disinfection pool, and the specific steps are as follows:

[0040] N medical water samples were extracted from different locations of the chlorine disinfection pool, and the chlorine concentration value (in mg / L) of each medical water sample was obtained. These concentration values ​​were recorded as C1, C2, C3, ... C n ;

[0041] By calculating the average value of chlorine concentration And the standard deviation σ of the chlorine concentration value can be used to determine whether the chlorine concentration distribution is uniform.

[0042] Furthermore, the average value of the chlorine concentration is The calculation formula is:

[0043]

[0044] Where: n is the total number of sampling points, C i is the chlorine concentration value of the i-th sampling point;

[0045] Furthermore, the calculation formula for the standard deviation σ of the chlorine concentration value is:

[0046]

[0047] Further, the determination of whether the chlorine concentration distribution is uniform is specifically as follows:

[0048] Calculate the coefficient of variation CV:

[0049]

[0050] From this, it is judged that if the coefficient of variation CV is smaller, the chlorine concentration distribution is more uniform, otherwise it is uneven.

[0051] Furthermore, the present invention provides a medical wastewater treatment zero-discharge system, which is implemented according to the improved medical wastewater treatment zero-discharge method.

[0052] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0053] Medical sewage is pretreated in advance so that it can be input into an activated sludge pool for sludge treatment. After treatment in the activated sludge pool, medical clean water and sludge are obtained. The medical clean water is input into a disinfection pool, and the flow rate of the medical clean water, the type and amount of pathogens, the organic matter and ammonia nitrogen concentration in the sewage are combined with the temperature and light to determine the disinfectant content, and the dosage of the disinfectant is clarified, so as to achieve accurate disinfection of the medical clean water and improve the adaptability of the disinfection. Furthermore, after disinfection, random inspection is performed to determine whether the zero emission standard is met, so as to improve the current purification and disinfection efficiency of medical sewage and achieve zero emission. The disinfected discharge water is piped to various toilets in the hospital and used as flushing water. Flushing with disinfectants can remove toilet odors, further reduce the pollution and treatment costs of fecal water, reduce cleaning workload, and reduce toilet scaling. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0055] Figure 1 It is a schematic diagram of the overall method flow of the present invention. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] The present invention will be further described below in conjunction with the embodiments.

[0058] Example 1 (see Figure 1 ): An improved zero-discharge method for medical wastewater treatment, comprising the following steps:

[0059] Step 1: Pre-treat the medical wastewater by removing particulate pollutants and suspended solids in the medical wastewater through a grid or screen in the flow pipe of the medical wastewater, so as to facilitate the subsequent purification steps of the medical wastewater.

[0060] In the above, it should be noted that when removing particulate pollutants and suspended matter in medical wastewater by means of grids or screens, for coarse grids: medical wastewater may contain larger particles of waste, such as gauze, cotton balls, syringe casings, etc., the aperture of the coarse grid is generally 10-20mm, which is used to intercept these larger debris and prevent them from entering subsequent treatment equipment; for fine grids or screens: for small particle waste and suspended matter, such as fibers, paper scraps, etc., the aperture of the fine grid is generally 1-5mm, which can intercept relatively small particles and reduce the burden of subsequent treatment steps.

[0061] Step 2: The treated medical sewage is input into the regulating tank to equalize the water quality and water volume of the medical sewage. The regulating tank can balance the pH value and organic matter concentration of the water quality of the medical sewage to ensure the stable operation of the subsequent treatment system;

[0062] Step 3: Input the medical sewage into the activated sludge tank to continuously aerate the medical sewage to maintain oxygen supply. Through aeration, the medical sewage and activated sludge are fully mixed to ensure that the pollutants in the sewage are in close contact with the microorganisms, thereby improving the degradation efficiency;

[0063] It should be noted that in medical sewage, common organic pollutants include patient body fluids, drug residues, disinfectants, etc. These organic substances are decomposed through the metabolism of microorganisms, gradually reducing the chemical oxygen demand (COD) and biological oxygen demand (BOD) in the water, that is, the pollution load in medical sewage is significantly reduced. Nutrient removal: In addition to organic matter, nutrients such as nitrogen and phosphorus in sewage are also taken up by microorganisms and used as elements required for their growth;

[0064] Furthermore, in the activated sludge tank, microorganisms reproduce by utilizing organic matter in the medical sewage to form new activated sludge.

[0065] In the above, in the process of treating medical sewage through the activated sludge tank, as the activated sludge continues to proliferate, part of the activated sludge will gradually lose its activity and be recorded as aged sludge. These aged sludges need to be discharged from the system regularly and then treated. Therefore, the amount of aged sludge to be discharged is determined to facilitate the normal treatment of medical sewage by the activated sludge tank. The calculation formula for the discharge amount of aged sludge is as follows:

[0066] Calculate the total amount of sludge in the aeration tank (activated sludge tank)

[0067] X=V×MLSS

[0068] Where: X is the total amount of sludge, V is the volume of the aeration tank, and MLSS is the sludge concentration in the aeration tank;

[0069] Determine the amount of sludge to be discharged daily:

[0070]

[0071] In the formula, Q p is the amount of aged sludge that needs to be discharged daily, and SRT is the sludge age;

[0072] Therefore, based on the above, the sludge volume of the aged sludge is discharged regularly, and the return sludge is returned to the aeration tank to maintain a stable microbial concentration in the system.

[0073] Furthermore, the treated medical wastewater is input into a sedimentation tank to separate sludge and clean water from the medical wastewater. By separating the wastewater and clean water, a treated supernatant, i.e., medical clean water, is obtained. At this time, a large amount of suspended matter in the medical wastewater is removed.

[0074] Step 4: Disinfect the treated medical water using chlorine. After disinfection, the pathogen content in the medical water is greatly reduced, ensuring that the water quality meets national emission standards and can be safely discharged or reused.

[0075] In the above scheme, the method steps of disinfection by chlorine are:

[0076] S100, inputting the medical clean water into the disinfection pool: inputting the treated medical clean water into the chlorine disinfection pool, and setting the chlorine disinfection time T, so that the clean water is disinfected in the chlorine disinfection pool;

[0077] S200. Determine the disinfectant content: In the chlorine disinfection process of medical clean water, the dosage of chlorine needs to consider many factors, including: the flow rate of medical clean water, the type and amount of pathogens, organic matter (BOD) in sewage, and ammonia nitrogen concentration. At the same time, environmental and weather conditions such as temperature and light will also have a certain impact on the disinfection efficiency of chlorine. Therefore, this department combines the flow rate of medical sewage, the type and amount of pathogens, organic matter (BOD) in sewage, and ammonia nitrogen concentration factors, and introduces environmental and weather conditions to comprehensively calculate the disinfectant, that is, the dosage of chlorine. The specific determination steps are as follows:

[0078] Determine the state influence coefficient ChlZ A :

[0079]

[0080] Where Qm is the flow rate of medical clean water (m 3 / h), C patfebs is the concentration of pathogens in medical clean water (pcs / L), Bj ods is the biochemical oxygen demand in medical water (mg / L), N mgis the ammonia nitrogen concentration in medical clean water (mg / L), CQB is the number of calculation items, which is preset to 4, β1, β2, β3 and β4 are the corresponding weight coefficients, and Cβx is the constant correction coefficient, where the weight coefficient can be determined by the least squares method, which will not be described in detail here;

[0081] Determine the environmental impact factor Chod B :

[0082]

[0083] Where: T pcs is the ambient temperature (℃, it should be noted that the lower the temperature, the greater the demand for chlorine), Lj ux is the light intensity (Lux, the stronger the light, the faster the hypochlorous acid decomposes due to ultraviolet rays, that is, the greater the demand for chlorine), and is the weight coefficient, is the constant correction coefficient, TLC is the number of calculation items, and the default value is 2;

[0084] Determine the actual impact coefficient of Chlorids:

[0085]

[0086] Where: ω1 and ω2 are the corresponding weight coefficients, CCH is the number of calculation items, which is preset to 2. is the constant correction factor;

[0087] Therefore, based on the actual influence coefficient Chlorids, the corresponding disinfectant content matching interval is obtained to obtain the chlorine dosage, so as to obtain a more accurate chlorine dosage, so that chlorine can be accurately added to the chlorine disinfection pool to ensure the disinfection accuracy and efficiency of medical clean water without causing excessive use and waste of disinfectants.

[0088] S300, uniform distribution of disinfectant: placing the determined dosage of chlorine in the chlorine disinfection tank and mixing it. A hydraulic mixer may be used to allow the chlorine to fully contact with the medical clean water in the chlorine disinfection tank to achieve uniform mixing. The mixing time of the hydraulic mixer is calculated according to the following relationship:

[0089]

[0090] Where: t mix is the mixing time (min. Generally, the greater the flow rate of medical sewage, the faster it passes through the chlorine disinfection tank. When the flow rate is large, stronger stirring or higher mixing efficiency is required to ensure sufficient contact between chlorine and medical sewage), V is the effective volume of the chlorine disinfection tank (m 3Volume is the basis for ensuring that there is enough contact space between sewage and chlorinating agent. Generally, the larger the pool volume, the longer the mixing time may be required). μ is the mixing efficiency coefficient. It depends on the type, layout and stirring intensity of the hydraulic mixer. Usually, μ takes a value of 1.2 to 2, which is used to adjust the actual mixing effect.

[0091] S400, sampling test of disinfectant concentration: on the basis of uniform distribution of disinfectant, sampling points are set at multiple locations of the chlorine disinfection pool, usually at different depths at the bottom, middle and surface of the pool, as well as at different horizontal positions, so as to reflect the chlorine distribution in different areas of the mixing pool. Typical sampling points can be arranged at the entrance, middle and exit of the chlorine disinfection pool to ensure that the clean water samples on different flow paths are tested. It should be noted that when extracting clean water samples on different flow paths for testing, sampling needs to be carried out after chlorine has been added to the chlorine disinfection pool for a certain period of time to ensure that there is enough contact time for the chlorine to fully diffuse and react;

[0092] Specifically, the chlorine concentration of each sampling point can be detected by a residual chlorine detector or chemical reagents. The residual chlorine concentration is usually measured using a colorimetric method or an electrochemical method to ensure accuracy. The test results should show that the chlorine concentrations at different locations are basically consistent, and the difference should not exceed the set threshold (such as within 10%). If the difference is too large, it indicates that the mixing effect is not good and the hydraulic mixer needs to be adjusted.

[0093] It is worth noting that the present embodiment provides a method for determining the uniform distribution of chlorine in a mixing tank (chlorine disinfection tank), and the specific steps are as follows:

[0094] N medical water samples were extracted from different locations of the chlorine disinfection pool, and the chlorine concentration value (in mg / L) of each medical water sample was obtained. These concentration values ​​were recorded as C1, C2, C3, ... C n ;

[0095] Calculate the average chlorine concentration value

[0096]

[0097] Where: n is the total number of sampling points, C i is the chlorine concentration value of the i-th sampling point;

[0098] Calculate the standard deviation σ of the chlorine concentration values:

[0099]

[0100] Calculate the coefficient of variation CV:

[0101]

[0102] Based on this judgment, the smaller the coefficient of variation CV is, the more uniform the chlorine concentration distribution is. Usually, when the coefficient of variation CV is lower than 10%, the chlorine distribution is considered to be relatively uniform, otherwise it is uneven. If it is uneven, it is necessary to adjust the hydraulic mixer, increase the chlorine addition point or adjust the water flow path.

[0103] Step 5: After chlorine disinfection, collect medical clean water and make the following judgments:

[0104] SA, pathogen removal

[0105] Ensure that after disinfection, the number of pathogens reaches the limit set by the state. Common disinfection indicators include the concentration of fecal coliform group, the total number of coliform group and the removal rate of viruses to ensure that medical clean water meets the standards;

[0106] Residual concentrations of SB, organic matter, and ammonia nitrogen

[0107] Although chlorine disinfection mainly acts on pathogens, the disinfection effect will be reduced when chlorine reacts with organic matter or ammonia nitrogen. Therefore, the concentration of organic matter and ammonia nitrogen needs to be checked after disinfection to ensure that it meets the discharge standards;

[0108] SC, residual chlorine control

[0109] Although residual chlorine has a continuous bactericidal effect, excessive residual chlorine will have a negative impact on the ecosystem. The purpose of setting the residual chlorine index is to avoid further pollution of the water body while ensuring the disinfection effect;

[0110] Therefore, the above-mentioned pathogen removal, residual concentration of organic matter and ammonia nitrogen, and residual chlorine control are used to determine whether the medical clean water meets the discharge standards. If it meets the standards, the treatment is completed and a discharge signal is generated. Otherwise, no discharge signal is generated.

[0111] Finally, the present invention also provides a zero-discharge system for medical wastewater treatment, which is implemented according to the improved zero-discharge method for medical wastewater treatment. The above-mentioned machine can be referred to and will not be described in detail here.

[0112] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An improved zero-discharge method for medical wastewater treatment, characterized in that: The steps include: Step 1: Pre-treat medical wastewater to remove particulate pollutants and suspended solids in medical wastewater; Step 2: The treated medical sewage is input into the regulating tank to balance the pH value and organic matter concentration of the water quality of the medical sewage; Step 3: Input the medical sewage into an activated sludge tank to continuously aerate the medical sewage to maintain oxygen supply, so that pollutants in the medical sewage are in close contact with microorganisms for degradation, and input the treated medical sewage into a sedimentation tank to separate sludge and clean water from the medical sewage, and obtain treated medical clean water by separating sewage and clean water; Step 4: Disinfect the treated medical water, wherein the disinfection method and steps are as follows: Medical clean water is input into the disinfection pool; Determine the disinfectant content; specifically, combine the flow rate of medical clean water, the type and quantity of pathogens, organic matter in sewage, ammonia nitrogen concentration with temperature and light to determine the disinfectant content and clarify the dosage of disinfectant; Disinfectant is evenly distributed; Sampling and testing of disinfectant concentration; Step 5: After the medical clean water is disinfected, collect the medical clean water and make a judgment to determine whether the disinfection is completed and the discharge index is reached. If the disinfection is completed and the discharge index is reached, a discharge signal is generated, otherwise no signal is generated.

2. An improved zero-discharge method for medical wastewater treatment according to claim 1, characterized in that: The removal of particulate pollutants and suspended solids is specifically performed by removing them through a grid or a screen.

3. An improved zero-discharge method for medical wastewater treatment according to claim 1, characterized in that: After the medical sewage is input into the activated sludge tank, the amount of aged sludge to be discharged is determined, and the calculation formula for the amount of aged sludge discharged is as follows: Calculate the total amount of sludge in the activated sludge tank X=V×MLSS Where: X is the total amount of sludge, V is the volume of the aeration tank, and MLSS is the sludge concentration in the aeration tank; Determine the amount of sludge to be discharged daily: In the formula, Q p is the amount of aged sludge that needs to be discharged daily, and SRT is the sludge age.

4. The improved zero-discharge method for medical wastewater treatment according to claim 1, characterized in that: The method for determining the disinfectant content is: Determine the state influence coefficient ChlZ A : Where Qm is the flow rate of medical clean water, C patfebs is the pathogen concentration in medical water, Bj ods is the biochemical oxygen demand in medical water, N mg is the ammonia nitrogen concentration in medical water, CQB is the number of calculation items, β1, β2, β3 and β4 are the corresponding weight coefficients, Cβx is the constant correction coefficient, where; Determine the environmental impact factor Chod B : Where: T pcs is the ambient temperature, Lj ux is the light intensity, and is the weight coefficient, is the constant correction coefficient, TLC is the number of calculation items; Determine the actual impact coefficient of Chlorids: Where: ω1 and ω2 are the corresponding weight coefficients, CCH is the number of calculation items, is the constant correction factor; Based on the actual influence coefficient Chlorids, the corresponding disinfectant content matching interval is obtained to obtain the disinfectant content, that is, the dosage of chlorine.

5. An improved zero-discharge method for medical wastewater treatment according to claim 1, characterized in that: When performing uniform distribution of disinfectant, chlorine is placed in the chlorine disinfection tank and mixed by a hydraulic mixer to calculate the mixing time. The total time is calculated according to the following relationship: Where: t mix is the mixing time, V is the effective volume of the chlorine disinfection tank, μ is the mixing efficiency coefficient, and μ takes a value of 1.2 to 2, which is used to adjust the actual mixing effect.

6. The improved zero-discharge method for medical wastewater treatment according to claim 1, characterized in that: The uniform distribution of chlorine in the chlorine disinfection pool is determined by sampling and testing the disinfectant concentration. The specific steps are as follows: N medical water samples were extracted from different locations of the chlorine disinfection pool, and the chlorine concentration value of each medical water sample was obtained. These concentration values ​​were recorded as C1, C2, C3, ... C n ; By calculating the average value of chlorine concentration And the standard deviation σ of the chlorine concentration value can be used to determine whether the chlorine concentration distribution is uniform.

7. An improved zero-discharge method for medical wastewater treatment according to claim 6, characterized in that: The average value of the chlorine concentration value The calculation formula is: Where: n is the total number of sampling points, C i is the chlorine concentration value of the i-th sampling point.

8. An improved zero-discharge method for medical wastewater treatment according to claim 7, characterized in that: The calculation formula for the standard deviation σ of the chlorine concentration value is:

9. An improved zero-discharge method for medical wastewater treatment according to claim 8, characterized in that: The determination of whether the chlorine concentration distribution is uniform is specifically as follows: Calculate the coefficient of variation CV: From this, it is judged that if the coefficient of variation CV is smaller, the chlorine concentration distribution is more uniform, otherwise it is uneven.

10. A zero-discharge system for medical wastewater treatment, characterized in that: The system is implemented according to an improved zero-discharge method for medical wastewater treatment as described in claim 1.

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