Sterilizing method for hospital waste water

Abstract

The present invention relates to sewage treatment, and is especially sterilizing method of hospital waste water. The method reaches sterilizing aim with free OH radical produced through the reaction between FeSO4 and H2O2 under acid condition. Specifically, the sterilizing method of hospital waste water includes first regulating the pH value of waste water to 3-6, the subsequent adding FeSO4 to reach concentration of 0.02-0.1 mmol / L through stirring, adding H2O2 to reach concentration of 0.2-1.0 mmol / L, and reaction for 5-20 min before exhausting. The method is simple, efficient, low in toxicity, without secondary pollution, simple and suitable for sterilizing hospital waste water as well as water in swimming pool.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a disinfection and sterilization method for hospital sewage. technical background [0002] Hospital sewage is mainly sewage discharged from the hospital's diagnosis and treatment rooms, laboratories, wards, laundry rooms, X-ray photography rooms and operating rooms. Its sources and components are very complicated, and often contain some special pollutants, such as drugs and disinfectants. , diagnostic agents, detergents, and a large number of pathogenic microorganisms, parasite eggs and various viruses, such as roundworm eggs, tuberculosis and Shigella, etc. These bacteria, viruses, and parasite eggs have certain resistance in the environment. Some survive in sewage for a long time. When people touch or eat water and vegetables polluted by germs, viruses, parasite eggs or toxic substances, they will make people sick and even cause outbreaks of infectious diseases. The SARS epidem...

AI Technical Summary

Problems solved by technology

These sterilization and disinfection methods have their own obvious limitations: physical methods such as ultraviolet light have no follow-up antivirus effect, and the treatment cost is high; ozone generation has high construction investment, large power consumption, high operating cost, and is prone to serious corrosion; liquid chlorine Disinfection is ineffective against certain viruses and spores, and it is prone to odor. Its disinfection effect is easily affected by water quality, water temperature, contact time, and pH value, and as time goes by, viruses in water have greater resistance to liquid chlorine disinfection In addition, the liquid chlorine dosing equipment has a complex structure, is easily corroded, and is more dangerous; sodium hypochlorite disinfection consumes relatively large power and salt, high operating costs, and its disinfection ability is weak, and it is easy to bring waste residue during the process; bleaching powder Disinfection produces strong irritating gas during the operation, which is not conducive to the health of operators. The concentration of disinfectant is not easy to control, and the residues after the reaction accumulate in the sewage tank and easily cause blockage of the sewer; the cost of chlorine dioxide disinfection is high, and the generated ClO 2 - , ClO 3 - It is harmful to health, and its safety needs to be further studied; in addition, almost all chlorinated disinfectants can interact with various organic substances such as humus in water to produce many carcinogenic, teratogenic, and mutagenic halogenated hydrocarbon organic substances