Difference between air disinfector and air conditioning system in hospital purification engineering
Release time:2019-12-24 source:
Difference between air disinfector and air conditioning system in hospital purification engineering
Compared with the air-conditioning system, the air disinfector has two different ways of air treatment, which are quite different.
1. It can't completely deal with the larger particles in the air, and can't thoroughly clean the carrier (particles above 0.3 μ m) for the survival of sanitary bacteria. The air disinfector mainly sterilizes the bacteria attached to the dust in the air through the self circulation of air through ozone, ultraviolet, plasma, photocatalyst and other equipment. Some of them can also absorb some larger particles of dust through electrostatic adsorption, but the effect is not good, and secondary dust is easy to appear.
2. The air volume is small, the indoor air circulation path is short, and the overall sterilization effect is poor.
3. Purification air conditioning system uses high-efficiency filter, physical barrier mode, no side effects, one-time, the Ministry of health disinfection specification points out that only air purification filter mode is used for clean room air sterilization. But the resistance is large. Disinfection efficiency: 99.9999% - 99.99999% for Bacillus subtilis (2004).
4. The effect of several disinfection methods of air disinfector is not very good. It is described as follows:
(1) Ozone. Light blue gas, strong oxidation, the oxygen atom produced by its decomposition can oxidize, penetrate the bacterial cell wall and kill bacteria. Broad spectrum sterilization but not dust removal, indoor must be unmanned, damage a variety of items, on the surface of the microbial effect is small. Harmful to human respiratory tract. The report is not for use. The disinfection efficiency was 91.82%.
(2) UV irradiation. Because of the high air flow rate, the small dose of bacteria, and the poor effect, it can only be used in the air conditioning system to remove bacteria without dust removal and ozone. Who, EU GMP have declared it as a generally unacceptable method, not to mention final sterilization. The disinfection efficiency was 82.90%.
(3) Nano photocatalysis. Under the irradiation of sunlight and ultraviolet, the surface of the catalytic active substance oxidizes and decomposes the volatile organic vapor or bacteria, which is converted into CO2 and water. It is required that the disinfected air must be in full contact with the catalytic substances, and there must be a prefilter for a certain period of time. Ultraviolet radiation also produces ozone. Even negative. The disinfection efficiency is 75%, the test results of some products are only 30%, and even negative values appear in the experiment.
(4) Plasma. Gases produce highly ionized electron clouds under the action of heating or strong electromagnetic field, in which active radicals and rays have strong broad-spectrum killing effect on microorganisms. Dust particles cannot be removed. The disinfection efficiency was 66.70%.
(5) Negative ions. Under the impact of electric field, ultraviolet, ray and water, the air is ionized and produced, which can adsorb dust particles into heavy ions and settle. The disadvantage is that there is secondary dust, which is not very useful in air conditioning system. The disinfection efficiency was 68.20%.
(6) Single zone static. High voltage electric field forms corona, which produces free electrons and ions, which are charged by colliding and adsorbing on dust bacteria, and then deposited on dust collecting electrode and removed. The effect on larger particles and fibers is poor, which will cause discharge. The advantage is that it can remove dust and bacteria with little resistance. The disadvantage is that it is troublesome and time-consuming to clean. It must have a pre filter, which may produce ozone and nitrogen oxides, and form secondary pollution. The disinfection efficiency is 50% (only about 20% in some product tests).
5. It is not allowed to control and adjust the temperature and humidity, dehumidify and humidify, and control the pressure difference.
6. Small air volume and low efficiency of air total replacement. The noise is large.
7. It can't replace indoor surface disinfection, but can only be used as an auxiliary disinfection tool.
Shandong ed purification Engineering Co., Ltd., founded in August 2010, has been committed to the construction of special departments in the hospital for ten years. It is a professional enterprise engaged in purification of clean operating department, decoration of clean operating room, construction of ICU ward, construction of neonatal NICU, CCU ward, hospital laboratory, decoration of central supply room, construction of laminar flow ward and design and construction of vein configuration center. The main service object is a large, medium and small hospital, which has the qualification of professional contracting related to purification engineering. There are many industry cases. Welcome new and old customers to come for consultation. For more knowledge of medical purification industry, please pay attention to wechat public number: aide-188 (ED purification oxygen supply)