CN113582460A - Medical sewage treatment method - Google Patents
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- CN113582460A CN113582460A CN202110932887.8A CN202110932887A CN113582460A CN 113582460 A CN113582460 A CN 113582460A CN 202110932887 A CN202110932887 A CN 202110932887A CN 113582460 A CN113582460 A CN 113582460A
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- 239000010865 sewage Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000012528 membrane Substances 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000001954 sterilising effect Effects 0.000 claims description 27
- 241000894006 Bacteria Species 0.000 claims description 23
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 15
- 239000011574 phosphorus Substances 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 241000700605 Viruses Species 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000001546 nitrifying effect Effects 0.000 claims description 5
- 230000001580 bacterial effect Effects 0.000 claims description 4
- 230000000593 degrading effect Effects 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- 241001453382 Nitrosomonadales Species 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 239000002957 persistent organic pollutant Substances 0.000 abstract 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 241000607142 Salmonella Species 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000370 acceptor Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 241000222122 Candida albicans Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 208000035473 Communicable disease Diseases 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 208000032420 Latent Infection Diseases 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 241000589517 Pseudomonas aeruginosa Species 0.000 description 1
- 241000607768 Shigella Species 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940095731 candida albicans Drugs 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037771 disease arising from reactivation of latent virus Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000002601 radiography Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to a medical sewage treatment method, which comprises the following steps: s1, passing the medical sewage through a filtering treatment system; s2, transferring the medical sewage treated by the S1 to a biological membrane treatment system; s3, transferring the medical sewage treated by the S2 to an MBR system; s4, transferring the medical sewage treated by the S3 into a disinfection system; s5 detects emissions. The invention has the effects of denitrification and dephosphorization, degradation of organic pollutants and high-efficiency sterilization and disinfection, and the quality of the effluent is detected to be superior to the discharge standard of the first-class A in GB18918-2002, thereby solving the problems of large floor area and high capital cost of the traditional treatment method; meanwhile, the defects of high cost of operating agents, unstable effluent quality and the like of a primary strong physicochemical technology are overcome.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a medical sewage treatment method.
Background
Medical wastewater is mainly wastewater discharged from a clinic, laboratory, ward, laundry, radiography room, operating room, etc. of a hospital (general hospital, professional hospital, and other types of hospitals) to the natural environment or urban pipelines. The medical sewage has complex sources and components, contains pathogenic microorganisms, toxic and harmful physical and chemical pollutants, radioactive pollutants and the like, and has the characteristics of space pollution, acute infection, latent infection and the like. Therefore, medical sewage is directly discharged into urban sewers without being subjected to harmless treatment such as disinfection and inactivation, so that water and soil pollution is caused, various diseases are caused seriously, and the outbreak of infectious diseases is caused. At present, hospitals which can achieve the discharge of medical sewage reaching national standards are few, the laws are not standard, the environmental awareness is weak, and the direct discharge of medical wastewater and the conditions of high pollution and low treatment in hospitals are caused.
The traditional primary strong physicochemical treatment is adopted in the existing medical sewage treatment technology, and the technology has the defects of low treatment efficiency, easy influence of suspended matters on the disinfection effect, unstable effluent and the like; when the two-stage activated sludge process technology is adopted, the defects of large occupied area, long construction period and the like mainly exist, and the above technologies have some defects.
Patent No. CN 109205892A discloses a technique of filtration first, flocculation and precipitation again disinfection treatment, and this method needs to use a large amount of flocculating agent, has increaseed the post processing degree of difficulty on the one hand, and its flocculation basin area is very big on the other hand, and the construction cycle is long.
Patent No. CN105906003A discloses a medical sewage purification treatment material, which can reduce the COD, BOD and sulfide content of medical sewage and kill escherichia coli, candida albicans and pseudomonas aeruginosa, but the medical sewage purification treatment material uses a large amount of chemical reagents, which removes impurities from medical sewage and kills bacteria while introducing a lot of chemical reagents, which has a great impact on the environment.
Patent No. CN110255800A discloses a medical sewage purification treatment method, which adopts solid-liquid separation; the method adopts high-temperature high-pressure sterilization, and then adopts an evaporation and condensation mode to purify water, and has the advantages of high heating temperature, large energy consumption and limited treatment capacity. The method carries out combustion treatment on solid waste in the solid-liquid separation, although the treatment of combustion tail gas is introduced, toxic and harmful bacteria in the solid waste are difficult to be preserved and cannot leak out in the combustion treatment process, and secondary pollution is generated.
Patent No. CN111908705A discloses a process for removing nitrogen and phosphorus, which relates to a plurality of sedimentation tanks and coagulation reaction tanks, uses a large amount of coagulation and flocculation reagents, complicates the whole treatment process, and has the defects of floor area, cost investment and post-treatment.
Disclosure of Invention
In order to solve the problems, the invention provides a medical sewage treatment method, which comprises the following steps:
s1, filtering: intercepting suspended matters of the medical sewage by the medical sewage through a buffer tank with a grid forming an angle of 35 degrees with the horizontal plane;
s2, biofilm treatment: transferring the medical sewage treated by the S1 to an anaerobic tank provided with a stirring device and a denitrifying bacteria biofilm, an anoxic tank provided with a stirring device and anaerobic ammonia oxidizing bacteria, and an aerobic tank provided with a stirring device and a nitrifying bacteria biofilm for removing nitrogen and degrading organic matters;
s3, MBR system: transferring the medical sewage treated by S2 to an MBR system, adding a phosphorus removing agent, treating for 2-4h, fully removing phosphorus and intercepting bacterial viruses in the medical sewage;
s4, disinfection and sterilization system: transferring the medical sewage treated by the S3 to a disinfection and sterilization system, and adopting a composite disinfection and sterilization mode of ultraviolet disinfection and electrolytic disinfection and sterilization.
And S5, detecting the medical sewage after treatment, and discharging after reaching the standard.
The buffer tank is provided with an aeration device for removing residual effective chlorine in the medical raw water.
The dissolved oxygen in the anaerobic tank is less than 0.2mg/L, and the treatment time of the anaerobic tank is 0.5-2 h.
The dissolved oxygen in the anoxic tank is 0.2-0.5mg/L, and the treatment time of the anoxic tank is 0.5-2 h.
The dissolved oxygen in the aerobic tank is more than 0.5mg/L, and the treatment time of the aerobic tank is 1-3 h.
The phosphorus removing agent adopts an autonomous patent technology product (CN201210317806.4), mainly comprises composite polyaluminium chloride and a high-efficiency phosphorus removing agent, and the adding amount is 20-50 ppm.
The MBR membrane adopts a flat membrane.
The disinfection and sterilization system adopts a composite disinfection and sterilization mode of ultraviolet disinfection and sterilization and electrolysis disinfection and sterilization, the electrolysis sterilizer adopts an independent patent technology product (CN2020226410003), and the disinfection and sterilization time is 1-2 h.
The invention achieves the following beneficial effects:
1. the grid of the adjusting tank selected by the invention forms an angle of 35 degrees with the horizontal plane, so that most of suspended matters in sewage can be removed, and the phenomenon of sudden and reverse gushing of water flow can not occur.
2. The aeration device is arranged in the buffer tank, so that residual effective chlorine in the medical raw water can be effectively removed to provide guarantee for the rear-end unit.
3. The anaerobic tank, the anoxic tank and the aerobic tank are provided with the stirrers, so that the biological membrane can be fully contacted with pollutants, and the aims of fully removing nitrogen and fully degrading organic matters are fulfilled.
4. The anaerobic ammonia oxidizing bacteria in an anoxic environment convert ammonia nitrogen contained in sewage into nitrogen to be removed by taking carbon dioxide or carbonate as a carbon source, taking ammonium salt as an electron donor and taking nitrite/nitrate as an electron acceptor, and assist in improving the denitrification effect of the biological membrane system.
5. The denitrifying bacteria utilize organic matters as carbon sources and NO 3-and NO 2-as electron acceptors in an anoxic environment, so that NO 3-and NO 2-are reduced into N2 to escape, and denitrification is performed, so that the nitrogen content is greatly reduced, the sewage load is reduced, and the denitrification effect of the whole system is further improved.
6. According to the invention, an MBR membrane system is selected, the separation effect is far better than that of the traditional sedimentation tank, the treated effluent is extremely clear and occupies more than 50% of the ground, suspended matters and turbidity are close to zero, and bacteria and viruses are greatly removed and separated.
7. The phosphorus removing agent adopted by the invention adopts an autonomous patent technology product, mainly comprises composite polyaluminium chloride and a high-efficiency phosphorus removing agent, and the dosage is 20-50 ppm.
8. The MBR membrane selected by the invention is a flat membrane, and the flat membrane has the advantages of high strength, strong pollution resistance, high mechanical strength, long cleaning period, long service life and the like.
9. The invention adopts a compound disinfection and sterilization mode of ultraviolet disinfection and electrolytic disinfection and sterilization, can fully kill toxic bacteria, fungi, viruses and the like, and leads the water quality to reach the dischargeable standard.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Firstly, medical sewage to be discharged passes through a buffer tank with a grid forming an angle of 35 degrees with the horizontal plane to intercept suspended matters of the medical sewage, the medical sewage in the buffer tank is transferred to an anaerobic tank provided with a stirring device and containing a denitrifying bacteria biofilm, the dissolved oxygen concentration of the anaerobic tank is 0.1mg/L, the medical sewage is transferred to the stirring device and an anoxic tank containing anaerobic ammonium oxidation bacteria after being treated for 1h, the dissolved oxygen concentration of the anoxic tank is 0.3mg/L, the medical sewage is transferred to an aerobic tank provided with the stirring device and containing the nitrifying bacteria biofilm after being treated for 0.5h, the dissolved oxygen concentration of the aerobic tank is 0.8mg/L, and nitrogen-containing substances and organic substances in the medical sewage are effectively removed and degraded after being treated for 1 h. And then transferring the medical sewage to an MBR system, adding 20ppm of a phosphorus removal agent, and treating for 3 hours to fully remove and intercept phosphorus and bacterial viruses in the medical sewage. And finally transferring the treated medical sewage to a composite disinfection and sterilization system for ultraviolet disinfection and sterilization and electrolytic disinfection and sterilization to kill bacteria for 2 hours, wherein the parameters of the medical sewage before detection treatment are as follows: CODcr: 150-250mg/L, BOD 5: 50-120mg/L, TP: 2.5-4.5mg/L, ammonia nitrogen: 20-40 mg/L; and SS: 100-250 mg/L. The parameters of the treated medical sewage are as follows: CODcr: less than or equal to 30.0mg/L, BOD 5: : less than or equal to 10.0mg/L, TP: less than or equal to 0.4mg/L, ammonia nitrogen: less than or equal to 1.0 mg/L; and SS: less than or equal to 10.0 mg/Lmg/L; coli groups were not detected; salmonella is not detected; the shiga bacteria were not detected. Completely reaches the emission standard.
Example 2
Firstly, medical sewage to be discharged passes through a buffer tank with a grid forming an angle of 35 degrees with the horizontal plane to intercept suspended matters of the medical sewage, the medical sewage in the buffer tank is transferred to an anaerobic tank provided with a stirring device and containing a denitrifying bacteria biofilm, the dissolved oxygen concentration of the anaerobic tank is 0.05mg/L, the medical sewage is transferred to the stirring device and an anoxic tank containing anaerobic ammonium oxidation bacteria after being treated for 1.5h, the dissolved oxygen concentration of the anoxic tank is 0.4mg/L, the medical sewage is transferred to an aerobic tank provided with the stirring device and containing the nitrifying bacteria biofilm after being treated for 1h, the dissolved oxygen concentration of the aerobic tank is 1.2mg/L, and nitrogen-containing substances and organic substances in the medical sewage are effectively removed and degraded after being treated for 2.5 h. And then transferring the medical sewage to an MBR system, adding 30ppm of a phosphorus removal agent, and treating for 2 hours to fully remove and intercept phosphorus and bacterial viruses in the medical sewage. And finally transferring the treated medical sewage to a composite disinfection and sterilization system for ultraviolet disinfection and sterilization and electrolytic disinfection and sterilization to kill the bacteria for 1.5h, wherein the parameters of the medical sewage before detection treatment are as follows: CODcr: 200-250mg/L, BOD 5: 70-130mg/L, TP: 2.5-4.5mg/L, ammonia nitrogen: 20-40 mg/L; and SS: 150-250 mg/Lmg/L. The parameters of the treated medical sewage are as follows: CODcr: less than or equal to 30.0mg/L, BOD 5: : less than or equal to 10.0mg/L, TP: less than or equal to 0.4mg/L, ammonia nitrogen: less than or equal to 1.0 mg/L; and SS: less than or equal to 10.0 mg/L; coli groups were not detected; salmonella is not detected; the shiga bacteria were not detected. Completely reaches the emission standard.
Comparative example 1
Firstly, passing medical sewage to be discharged through a common horizontal grid, intercepting suspended matters of the medical sewage by an adjusting tank, transferring the medical sewage in a buffer tank to an anaerobic tank provided with a stirring device and containing a denitrifying bacteria biofilm, wherein the dissolved oxygen concentration of the anaerobic tank is 0.05mg/L, transferring the medical sewage after 1.5h of treatment to an aerobic tank provided with the stirring device and containing the nitrifying bacteria biofilm, wherein the dissolved oxygen concentration of the aerobic tank is 1.2mg/L, and removing and degrading nitrogenous substances and organic substances after 1.5h of treatment. Then transferring the medical sewage to an ultraviolet disinfection and sterilization system to kill bacteria for 2.5 hours, wherein the parameters of the medical sewage before detection treatment are as follows: CODcr: 200-250mg/L, BOD 5: 70-130mg/L, TP: 2.5-4.5mg/L, ammonia nitrogen: 20-40 mg/L; and SS: 150-250 mg/Lmg/L. The parameters of the treated medical sewage are as follows: CODcr: less than or equal to 90.0mg/L, BOD 5: : less than or equal to 50mg/L, TP: less than or equal to 2mg/L, ammonia nitrogen: less than or equal to 12 mg/L; and SS: less than or equal to 100mg/L, and a small amount of coliform bacteria, salmonella bacteria and shigella bacteria which do not meet the discharge standard.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method for medical sewage treatment is characterized by comprising the following steps:
s1, filtering: intercepting suspended matters of the medical sewage by the medical sewage through a buffer tank with a grid forming an angle of 35 degrees with the horizontal plane;
s2, biofilm treatment: transferring the medical sewage treated by the S1 to an anaerobic tank provided with a stirring device and a denitrifying bacteria biofilm, an anoxic tank provided with a stirring device and anaerobic ammonia oxidizing bacteria, and an aerobic tank provided with a stirring device and a nitrifying bacteria biofilm for removing nitrogen and degrading organic matters;
s3, MBR system: transferring the medical sewage treated by S2 to an MBR system, adding a phosphorus removing agent, treating for 2-4h, fully removing phosphorus and intercepting bacterial viruses in the medical sewage;
s4, disinfection and sterilization system: transferring the medical sewage treated by the S3 to a disinfection and sterilization system, and adopting a compound disinfection and sterilization mode of ultraviolet disinfection and electrolytic disinfection and sterilization;
and S5, detecting the medical sewage after treatment, and discharging after reaching the standard.
2. The method for medical sewage treatment according to claim 1, wherein the buffer tank is provided with an aeration device for removing residual available chlorine in the medical raw water.
3. The medical sewage treatment method according to claim 1, wherein the dissolved oxygen in the anaerobic tank is less than 0.2mg/L, and the treatment time of the anaerobic tank is 0.5-2 h.
4. The medical sewage treatment method according to claim 1, wherein the dissolved oxygen in the anoxic tank is 0.2-0.5mg/L, and the treatment time in the anoxic tank is 0.5-2 h.
5. The medical sewage treatment method according to claim 1, wherein the dissolved oxygen in the aerobic tank is greater than 0.5mg/L, and the treatment time of the aerobic tank is 1-3 h.
6. The medical sewage treatment method according to claim 1, wherein the phosphorus removal agent adopts a self-patented technology product (CN201210317806.4), mainly composite polyaluminium chloride and a high-efficiency phosphorus removal agent, and the dosage is 20-50 ppm.
7. The method for medical sewage treatment according to claim 1, wherein the MBR membrane is a flat membrane.
8. The method for medical sewage treatment according to claim 1, wherein the disinfection and sterilization system uses a composite disinfection and sterilization mode of ultraviolet disinfection and electrolytic disinfection and sterilization, and the electrolytic disinfection apparatus adopts an independent patent technology product (CN2020226410003), and the disinfection and sterilization time is 1-2 h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110932887.8A CN113582460A (en) | 2021-08-13 | 2021-08-13 | Medical sewage treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110932887.8A CN113582460A (en) | 2021-08-13 | 2021-08-13 | Medical sewage treatment method |
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| CN113582460A true CN113582460A (en) | 2021-11-02 |
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Application publication date: 20211102 |