Microbial carrier and application thereof in treatment of medical wastewater

Abstract

The invention relates to the field of application of microbial carriers, in particular to a microbial carrier and application of the microbial carrier to treatment of medical wastewater, wastewater is treated through a microbial preparation, and the problem that in the prior art, secondary pollution is caused when a disinfectant is used for treatment is solved. The carrier is applied to microbial wastewater treatment, and finally, it is found that the carrier can effectively improve the activity of microorganisms and improve the viability of the microorganisms, wastewater treatment microorganisms can be amplified from a laboratory to actual production, and by adjusting COD and ammonia nitrogen values in wastewater, the wastewater treatment efficiency is improved. The wastewater treatment capacity of the microbial agent is effectively improved, the C / N ratio and the COD content are refined, then corresponding carriers are selected in a targeted mode to culture microorganisms, and the viability of the microorganisms is effectively improved. The treatment capacity on wastewater, especially medical wastewater, is improved.

Description

Technical Field

[0001] The present invention relates to the application field of microbial carriers, and in particular to microbial carriers and their application in treating medical waste water. Background Art

[0002] Medical wastewater includes anesthetic drugs, disinfectants, drug residues, etc. The organic pollutants in medical wastewater are highly volatile and can cause potential harm to the environment and human health. At present, there are three main ways to treat wastewater: the physical method is a method based on physical mechanisms to purify pollutants. The advantages are simple process and low cost. The disadvantages are that the removal effect is easily affected by the materials used and the treatment capacity is limited. The chemical method is to add chemical agents to the water and convert harmful substances in the water into harmless substances through chemical reactions, thereby achieving wastewater treatment. The advantages are high efficiency and strong removal force. The disadvantages are that the amount of chemical agents required is high and it is easy to cause secondary pollution. The biological method is the method with the best development prospects among the three methods, that is, to achieve wastewater treatment through the degradation ability of microorganisms themselves. It is not only pollution-free, but also beautifies the environment and improves the ecology. Therefore, there are more studies on biological treatment technology. Currently, there are four main biological methods commonly used, namely activated sludge method, membrane bioreactor, aerobic-anaerobic method, and biochar method. These methods also have certain disadvantages. The activated sludge method has poor operating stability and sludge loss; the biofilm of the membrane bioreactor has a limited service life and needs to be cleaned regularly before continued use; the aerobic-anaerobic method requires a longer adaptation period. Therefore, in response to the defects of current pollution treatment methods, there are also related studies in the prior art on the treatment of volatile organic pollutants in hospital wastewater through microbial treatment technology. The inventors of the research group are committed to using biological treatment technology to treat medical wastewater in the prior art. For example, the inventor's paper "Application of composite bacterial agents in medical wastewater treatment in a general hospital" discloses the use of composite bacterial agents in medical wastewater, but in actual work, it is found that: when using microorganisms for wastewater treatment, how to improve the activity of microorganisms and enhance the survival and reproduction ability of the treated microorganisms is particularly important. In the prior art, there are many reports that microorganisms that have a degrading effect on wastewater pollutants can perfectly achieve pollutant degradation in the laboratory process, but when applied to actual sewage treatment, due to equipment enlargement, changes in equipment operation and culture conditions, and the complexity of wastewater quality, the activity of microorganisms is often reduced, inactivated or even dead. Sometimes even supplementary feeding and addition cannot solve the problem. Therefore, how to improve the adhesion of microbial sludge and improve biological activity are problems that need to be solved in this field.

[0003] We know that the premise for microorganisms to treat wastewater is that they can survive and maintain high activity. Therefore, we can consider using microbial carriers to allow the bacterial agents to fully attach to the carriers as substrates and use the biological activity of the carriers to improve the activity of the microorganisms. At the same time, our research also found that the COD, ammonia nitrogen and other contents in water quality are the nutritional sources of microorganisms, and their proportions will affect the survival of microorganisms. Therefore, choosing different treatment schemes according to the changes in COD and ammonia nitrogen is also a feasible research idea for microbial agents in treating organic wastewater. Summary of the invention

[0004] In view of the above, it is necessary to select different treatment schemes according to the changes in COD and ammonia nitrogen, and improve the microbial carrier to treat medical wastewater.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The microbial carrier is composed of: rice bran, soybean meal, wood chips, peanut shell biochar and / or walnut shell biochar.

[0007] Furthermore, the microbial carrier is carrier one or carrier two; carrier one is prepared by mixing rice bran, soybean meal and peanut shell biochar in a mass ratio of 1-2:3-4:3-9; carrier two is prepared by mixing sawdust, peanut shell biochar and walnut shell biochar in a mass ratio of 2:4-5:3-9.

[0008] Furthermore, the mass ratio of the rice bran, soybean meal and peanut shell biochar in the carrier one is 2:3:6; the mass ratio of the sawdust, peanut shell biochar and walnut shell biochar in the carrier one is 2:4:9.

[0009] The present invention also includes the use of the microbial carrier in treating medical wastewater.

[0010] The present invention also includes a method for treating wastewater using the microbial carrier, characterized in that the method is:

[0011] (1) mixing the microbial preparation and the microbial carrier according to a mass ratio to prepare a carrier-microbial preparation;

[0012] (2) Determine the COD value and ammonia nitrogen value of the wastewater, and then adjust the water quality of the wastewater to: 5:1≤COD:ammonia nitrogen<7:1, 200(mg / L)≤COD<300(mg / L) or 7:1<COD:ammonia nitrogen, 300(mg / L)<COD;

[0013] (3) The wastewater is then regulated through a screen regulating tank, then enters an anaerobic tank for facultative aerobic treatment, then enters an aerobic regulating tank for aerobic treatment, then enters an MBR membrane tank for membrane treatment, and finally is discharged into a clear water tank, and then is discharged into a municipal pipe network; the carrier-bacteria agent described in step (1) is put into the anaerobic tank at one time, and then the carrier-bacteria agent is refluxed between the MBR membrane tank and the anaerobic tank.

[0014] When the water quality of the wastewater is 5:1≤COD: ammonia nitrogen<7:1, 200(mg / L)≤COD<300(mg / L), the selected microbial carrier is the carrier 1;

[0015] When the water quality of the wastewater is 7:1<COD:ammonia nitrogen, 300 (mg / L)<COD, the selected microbial carrier is the carrier 2.

[0016] Furthermore, after the carrier-bacteria agent is added, water inlet and outlet are suspended, and the aerobic pool and the membrane pool are intermittently ventilated, with a flow of 1 hour and a stop of 1 hour. After culturing for 2 to 3 days to form granular active carrier-bacteria agent, it is operated according to normal water inlet and outlet parameters.

[0017] Furthermore, the amount of the carrier-bacterial agent added is 1 kg / cubic meter of water.

[0018] Furthermore, the wastewater is medical wastewater.

[0019] The present invention has the following beneficial effects:

[0020] 1. The present invention uses microbial preparations to treat wastewater, which solves the problem of secondary pollution caused by using disinfectants in the prior art. The present application has developed its own compounded microbial carrier, which is then used in microbial wastewater treatment. It is finally found that the carrier can effectively improve the activity of microorganisms and the survival ability of microorganisms, which helps to amplify wastewater treatment microorganisms from the laboratory to actual production. Experimental verification shows that when microbial agents treat wastewater, the factors affecting the activity are not only the carrier, but also the COD and ammonia nitrogen values ​​in the wastewater are key factors. In view of the particularity of microbial agents, the COD and ammonia nitrogen values ​​in the wastewater are adjusted to effectively improve the treatment capacity of microbial agents for wastewater. The present application refines the C / N ratio and COD content, and then selects the corresponding carrier to cultivate microorganisms in a targeted manner, which effectively improves the survival ability of microorganisms. Improve its treatment capacity for wastewater, especially medical wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Process flow diagram for wastewater treatment equipment.

[0022] Figure 2 This is a comparison of water quality before and after treatment, with the left side showing the actual picture of the incoming water quality, and the right side showing the actual picture of the outgoing water quality.

[0023] Figure 3 This is a graph showing the changes in the carrier-bacteria agent in the degradation carrier-bacteria agent equipment on the 1st, 3rd and 4th days. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation of the present invention is described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0025] Embodiment 1:

[0026] This embodiment is a wastewater treatment process:

[0027] The experiment of this application was jointly carried out by the Guangxi Medical University and the Guangxi Nanning Baikete Microbiological Technology Co., Ltd. The wastewater was tested in the equipment of the cooperative unit: Guangxi Jianyuan Environmental Protection Technology Co., Ltd. The specific process flow is as follows Figure 1 As shown: the wastewater is regulated by the screen regulating tank, then enters the anaerobic tank for anaerobic treatment for 2 hours, then enters the aerobic regulating tank for aerobic treatment for 4 hours, then enters the MBR membrane tank for membrane treatment for 4 hours, and finally discharged into the clear water tank, and then discharged into the municipal pipe network, among which the carrier-bacteria agent is refluxed between the MBR membrane tank and the anaerobic tank.

[0028] Among them, the carrier-bacterial agent of the present application is an active microbial preparation, which is composed of the following ingredients: a commercially available microbial preparation (purchased from Beijing Xin Dayang Technology Development Co., Ltd. and Angel Yeast Co., Ltd.) and a carrier.

[0029] The carrier-bacterial agent is added in a one-time manner, that is, the active carrier-bacterial agent is added to the anaerobic tank at one time, and the amount added is 1kg / cubic water body. After the carrier-bacterial agent is added, the water inlet and outlet are suspended, and the aerobic tank and the membrane tank are ventilated intermittently, with 1 hour on and 1 hour off. After culturing for 2 to 3 days to form granular active carrier-bacterial agent, it is operated according to normal water inlet and outlet parameters.

[0030] Determination of influent water quality

[0031] (1) 5:1≤COD: ammonia nitrogen<7:1, 200(mg / L)≤COD<300(mg / L). If the water quality index does not meet the requirements, add carbon source or nitrogen source appropriately;

[0032] (2) 7:1<COD: ammonia nitrogen, 300(mg / L)<COD. If the water quality index does not meet the requirements, add appropriate carbon source or nitrogen source;

[0033] The carriers of this application are prepared by the research team, and are mainly divided into fiber carriers and biochar carriers. Among them, fiber carriers include: rice bran, sawdust and soybean meal; biochar carriers include: peanut shell biochar, rice husk biochar and walnut shell biochar;

[0034] The preparation method of biochar refers to the conventional method, specifically: take walnut shells, rice husks or peanut shells and dry them respectively, crush the dried walnut shells, rice husks or peanut shells respectively, and then put the walnut shells, rice husks or peanut shells into a high-temperature tube furnace and introduce nitrogen for carbonization. After cooling, the biochar is aged and modified with potassium hydroxide solution, and then dried, roasted, cooled, boiled in deionized water, filtered, neutralized and washed with hydrochloric acid solution, and then dried to constant weight to obtain the corresponding peanut shell biochar, rice husk biochar and walnut shell biochar.

[0035] According to different water qualities, different carriers are used to treat wastewater, as shown in Tables 1 to 5 below. If the wastewater meets the "GB8978-1996 Level 1 Discharge Standard" when discharged, it is considered that the wastewater treatment meets the standard. In the standard: SS < 70 mg / L, BOD 5 <20mg / L, COD<100mg / L, NH 3 -N<20mg / L.

[0036] Table 1 Wastewater quality

[0037]

[0038] In view of the above water quality, the applicant used different carriers for treatment, and the water quality at the outlet is shown in Table 2-Table 5:

[0039] Table 2 Wastewater quality after treatment

[0040]

[0041] As shown in Table 2, the wastewater treated with rice bran, soybean meal and peanut shell biochar carriers can meet the "GB8978-1996 First-level Emission Standard"; while the COD content of the wastewater treated with sawdust, rice husk biochar and walnut shell biochar carriers cannot meet the emission standard. The BOD content of the wastewater treated with rice husk biochar and walnut shell biochar carriers is 5 and NH 3 -N content cannot meet the discharge standard. Therefore, for wastewater 1, rice bran, soybean meal and peanut shell biochar are preferentially used as microbial carriers.

[0042] Table 3 Water quality after secondary wastewater treatment

[0043]

[0044] As shown in Table 3, the wastewater treated with sawdust, peanut shell biochar and walnut shell biochar can meet the "GB8978-1996 First-level Emission Standard"; while the wastewater treated with rice bran, soybean meal and peanut shell biochar can reach the "GB8978-1996 First-level Emission Standard"; 5 and SS content cannot meet the discharge standards. Therefore, for wastewater 2, wood chips, peanut shell biochar and walnut shell biochar are preferentially used as microbial carriers.

[0045] Table 4 Water quality after three treatments of wastewater

[0046]

[0047] As shown in Table 4, wastewater treated with rice bran, soybean meal and peanut shell biochar carriers can meet the "GB8978-1996 First-level Emission Standard"; while wastewater treated with sawdust, rice husk biochar and walnut shell biochar carriers can reach the "GB8978-1996 First-level Emission Standard"; 5 The COD values ​​of wastewater treated with rice husk biochar and walnut shell biochar carriers did not meet the discharge standards, and the NH 3 -N content does not meet the discharge standard, therefore, for wastewater three, rice bran, soybean meal and peanut shell biochar are preferentially used as microbial carriers.

[0048] Table 5 Water quality after wastewater treatment

[0049]

[0050] As shown in Table 5, the wastewater treated with sawdust, peanut shell biochar and walnut shell biochar as carriers can meet the "GB8978-1996 First-level Emission Standard"; while the wastewater treated with rice bran as carrier has the highest COD, SS and NH 3 -N content does not meet the discharge standard; the SS and NH 3 -N content does not meet the discharge standard; the BOD of wastewater treated with rice husk biochar carrier 5 and SS content cannot meet the discharge standards. Therefore, for wastewater 4, wood chips, peanut shell biochar and walnut shell biochar are preferentially used as microbial carriers.

[0051] Therefore, when 5:1≤COD:ammonia nitrogen<7:1, 200(mg / L)≤COD<300(mg / L), the applicable carriers are: rice bran, soybean meal and peanut shell biochar.

[0052] When 7:1<COD:ammonia nitrogen, 300(mg / L)<COD, the applicable carriers are: rice bran, soybean meal and peanut shell biochar.

[0053] Embodiment 2:

[0054] Based on the experimental results of Example 1, we concluded that when 5:1≤COD:ammonia nitrogen<7:1, 200(mg / L)≤COD<300(mg / L), the applicable carriers are: rice bran, soybean meal and peanut shell biochar. When 7:1<COD:ammonia nitrogen, 300(mg / L)<COD, the applicable carriers are: sawdust, peanut shell biochar and walnut shell biochar.

[0055] To this end, we explored the optimal ratio of carriers for these two water qualities. The specific wastewater treatment equipment and process flow were the same as in Example 1. The specific experimental plan was as follows: for water quality 1 (5:1≤COD: ammonia nitrogen <7:1, 200 (mg / L)≤COD <300 (mg / L)), bran, soybean meal and peanut shell biochar were selected and mixed according to the mass ratio of Table 6-Table 7 and then mixed with the strain, and then the carrier-bacterial agent was fed according to the wastewater treatment scheme of Example 1, and the water quality after the equipment treatment was recorded. The specific results are shown in Table 7; for water quality 2 (7:1 <COD: ammonia nitrogen, 300 (mg / L) <COD), sawdust, peanut shell biochar and walnut shell biochar were selected and mixed according to the mass ratio of Table 8-Table 9 and then mixed with the strain, and then the carrier-bacterial agent was fed according to the wastewater treatment scheme of Example 1, and the water quality after the equipment treatment was recorded. The specific results are shown in Table 10.

[0056] Table 6 Orthogonal experimental factor levels of different microbial carriers for water quality 1

[0057]

[0058] The orthogonal analysis of the above mass ratios and the results thereof are shown in Table 7:

[0059] Table 7 Orthogonal experiment and results

[0060]

[0061] It can be seen from Table 7 that the wastewater discharged after treatment with microbial carriers in Experiments 1, 2, 4 and 5 can meet the "GB8978-1996 First-level Emission Standard". At this time, the mass ratio of the microbial carrier is rice bran: soybean meal: peanut shell biochar = 1-2:3-4:3-9. The best water quality is Experiment 4, that is, the mass ratio of the microbial carrier is rice bran: soybean meal: peanut shell biochar is 2:3:6; while the water quality of other experimental groups cannot meet the emission standards.

[0062] Table 8 Orthogonal experimental factor levels of different microbial carriers for water quality 1

[0063]

[0064] The orthogonal analysis of the above mass ratios and the results thereof are shown in Table 9:

[0065] Table 9 Orthogonal experiment and results

[0066]

[0067] It can be seen from Table 9 that the wastewater discharged after treatment with microbial carriers in Experiment 5 and Experiment 6 can meet the "GB8978-1996 First-level Emission Standard". At this time, the mass ratio of the microbial carrier is sawdust: peanut shell biochar: walnut shell biochar = 2:4-5:3-9. The best water quality is Experiment 5, that is, the mass ratio of the microbial carrier is sawdust: peanut shell biochar: walnut shell biochar is 2:4:9; while the water quality of other experimental groups cannot meet the emission standards.

[0068] Embodiment 3:

[0069] This embodiment treats hospital wastewater:

[0070] Table 10 Types and contents of volatile organic pollutants in hospital wastewater

[0071] Types of organic pollutants Wastewater samples Types of organic pollutants Wastewater samples Ammonia nitrogen mg / L 40 Total arsenic mg / L 0.61 Animal and vegetable oil mg / L 8.3 Total chromium mg / L 2.64 Volatile phenol mg / L 0.69 Hexavalent chromium mg / L 0.46 Total cyanide mg / L 0.83 Total lead mg / L 0.93 Total mercury mg / L 0.06 Total silver mg / L 0.41 Total cadmium mg / L 0.23

[0072] The SS test value is 142 mg / L, and the COD test value is 180 mg / L. The COD is adjusted to 200 mg / L before entering the equipment for wastewater treatment. The method refers to the embodiment. The microbial carriers are selected as: rice bran, soybean meal and peanut shell biochar. The proportions are referenced to the optimal group (experiment 4: rice bran: soybean meal: peanut shell biochar = 2:3:6) and the worst group (experiment 7: rice bran: soybean meal: peanut shell biochar = 3:3:9) in Table 7 in Example 2. After preparing the corresponding carriers, the carrier-microorganism inoculation is performed. The water quality results are shown in Table 11. The test results, COD, BOD and SS values ​​refer to the "GB8978-1996 Primary Emission Standard", and the organic pollutants refer to the GB-18466-2005 Medical Institution Wastewater Discharge Requirements. The emission limits of volatile organic pollutants in medical wastewater are as follows:

[0073] Table 11 Emission Limit Standards for Volatile Organic Pollutants in Hospital Wastewater

[0074] Control Project Standard value Control Project Standard value Animal and vegetable oil mg / L 5 Volatile phenol mg / L 0.5 Total cyanide mg / L 0.5 Total mercury mg / L 0.05 Total cadmium mg / L 0.1 Total arsenic mg / L 0.5 Total chromium mg / L 1.5 Hexavalent chromium mg / L 0.5 Total lead mg / L 1.0 Total silver mg / L 0.5 Ammonia nitrogen mg / L 15

[0075] Samples were taken at the drain outlet, and the various test indicators are shown in Table 12:

[0076] Table 12 Water quality of hospital wastewater discharged with different mixing ratios of rice bran, soybean meal and peanut shell biochar as microbial carriers

[0077]

[0078] As shown in Table 12, when rice bran, soybean meal and peanut shell biochar are mixed in a ratio of 2:3:6 to prepare a microbial carrier and applied in wastewater treatment equipment, the water quality can be significantly improved, the organic matter content is reduced, and the discharge standard is met. If the rice bran, soybean meal and peanut shell biochar are mixed in a mass ratio of 3:3:9 to prepare a microbial carrier, the COD and BOD of the water quality are 5 NH 3 -N, total cyanide and total chromium content do not meet the emission standards. Therefore, it is shown that when the water quality is 5:1≤COD: ammonia nitrogen <7:1, 200 (mg / L)≤COD≤300 (mg / L), it is also feasible to use the scheme of Example 2 to treat hospital wastewater with a high organic matter content.

[0079] During the experiment, Figure 2 The left side of the figure shows the actual water quality of the inlet water of the 2:3:6 test group, and the right side shows the actual water quality of the outlet water. It can be clearly seen from the figures that the water quality has become clear. Figure 3 The changes of the carrier-microorganism agent in the 2:3:6 test group on the 1st, 3rd and 4th days of the degradation of the carrier-microorganism agent equipment are shown in the figure. As can be seen from the figure, the color of the degradation carrier-microorganism agent will become lighter and lighter as time goes by. Note: When microbial microorganism agents are used to replace traditional carrier-microorganism agents, the effluent water is clearer and the amount of disinfectant used can be effectively reduced. All pollutants will be decomposed by microbial microorganism agents into volatile substances such as carbon dioxide and nitrogen and dissipated. Excess microbial microorganism agents will be lost in a free state with the water flow, avoiding a large increase in the carrier-microorganism agent.

[0080] In addition, for the same hospital wastewater sample, the research team also adjusted the COD value to 310 mg / L, that is, COD / ammonia nitrogen = 310 / 40>7:1, satisfying the conditions of: 7:1≤COD:ammonia nitrogen, 300 (mg / L)<COD, and then used the carrier in Table 9 of Example 2 to conduct the same experiment, specifically selecting: the optimal group test 5, i.e., sawdust: peanut shell biochar: walnut shell biochar = 2:4:9 and the worst group test 1, i.e., sawdust: peanut shell biochar: walnut shell biochar = 1:3:3, and the results are shown in Table 13:

[0081] Table 13 Water quality of hospital wastewater discharge with different mixing ratios of sawdust, peanut shell biochar and walnut shell biochar as microbial carriers

[0082]

[0083] It can be seen from Table 13 that when sawdust, peanut shell biochar and walnut shell biochar are mixed in a ratio of 2:4:9 to prepare microbial carriers and applied in wastewater treatment equipment, the water quality can be significantly improved, the organic matter content is reduced, and the discharge standard is met. If sawdust, peanut shell biochar and walnut shell biochar are mixed in a mass ratio of 1:3:3 to prepare microbial carriers, the COD, SS and NH 3-N, the total cadmium content does not meet the discharge standards, therefore, it is explained that when the water quality is 7:1≤COD: ammonia nitrogen, 300 (mg / L)<COD, it is also feasible to use the scheme of Example 2 to treat hospital wastewater with a high organic matter content.

[0084] In summary, the present invention combines previous research, utilizes the growth characteristics of microbial agents, divides the C / N and COD of different influent wastewater by adjusting the C / N and COD content of wastewater, selects different microbial carriers to prepare carrier-agents, and realizes the maximum reproduction of microorganisms under different conditions, effectively improving the survival ability and activity of microbial agents, and helping to scale up wastewater treatment microorganisms from the laboratory to actual production. It is a treatment method that can effectively treat wastewater without causing secondary effects on the water body due to the use of disinfectants such as hypochlorous acid. This method is also applied to the treatment of medical wastewater with high concentrations of organic matter, and has a good treatment effect. It is a wastewater treatment method worthy of promotion.

[0085] The above examples only express several embodiments of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A microbial carrier, characterized in that The microbial carrier consists of: rice bran, soybean meal, wood chips, peanut shell biochar and / or walnut shell biochar.

2. The microbial carrier according to claim 1, characterized in that The microbial carrier is carrier one or carrier two; carrier one is prepared by mixing rice bran, soybean meal and peanut shell biochar in a mass ratio of 1-2:3-4:3-9; carrier two is prepared by mixing sawdust, peanut shell biochar and walnut shell biochar in a mass ratio of 2:4-5:3-9.

3. The microbial carrier according to claim 2, characterized in that The mass ratio of the rice bran, soybean meal and peanut shell biochar in the carrier one is 2:3:6; the mass ratio of the sawdust, peanut shell biochar and walnut shell biochar in the carrier one is 2:4:

9.

4. Use of the microbial carrier as described in any one of claims 1 to 3 in treating medical wastewater.

5. A method for treating wastewater using the microbial carrier according to any one of claims 1 to 3, characterized in that: The method is: (1) mixing the microbial preparation and the microbial carrier according to a mass ratio to prepare a carrier-microbial agent; (2) Determine the COD value and ammonia nitrogen value of the wastewater, and then adjust the water quality of the wastewater to: 5:1≤COD:ammonia nitrogen<7:1, 200(mg / L)≤COD<300(mg / L) or 7:1<COD:ammonia nitrogen, 300(mg / L)<COD; (3) The wastewater is then regulated through a screen regulating tank, then enters an anaerobic tank for facultative aerobic treatment, then enters an aerobic regulating tank for aerobic treatment, then enters an MBR membrane tank for membrane treatment, and finally is discharged into a clear water tank, and then is discharged into a municipal pipe network; the carrier-bacteria agent described in step (1) is put into the anaerobic tank at one time, and then the carrier-bacteria agent is refluxed between the MBR membrane tank and the anaerobic tank. When the water quality of the wastewater is 5:1≤COD: ammonia nitrogen<7:1, 200(mg / L)≤COD<300(mg / L), the selected microbial carrier is the carrier 1; When the water quality of the wastewater is 7:1<COD:ammonia nitrogen, 300 (mg / L)<COD, the selected microbial carrier is the carrier 2.

6. The method according to claim 5, characterized in that After the carrier-bacteria agent is added, the water inlet and outlet are suspended, and the aerobic pool and the membrane pool are ventilated intermittently, with one hour on and one hour off. After culturing for 2 to 3 days to form a granular active carrier-bacteria agent, it is operated according to normal water inlet and outlet parameters.

7. The method according to claim 5, characterized in that The amount of the carrier-bacterial agent added is 1 kg / cubic meter of water.

8. The method according to claim 5, characterized in that The wastewater is medical wastewater.

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