Conceptual difference between disinfection and cleaning in hospital air purification

1. Disinfection refers to a treatment method to eliminate or kill all pathogens and other harmful microorganisms except spores in the external environment or transmission media by physical or chemical methods, or to make the disinfection object harmless.

2. Cleaning refers to the use of some special materials to remove dust and bacteria from the air through physical methods, so as to achieve the purpose of making the air clean; not only to prevent the internal or external pollution of living particles, but also to control the internal pollution of inanimate particles. It is widely used in hospital operating room, disinfection supply center, ICU, neonatal room, general protective isolation ward, burn ward, laminar flow ward and other special areas.

Principles of other air purification methods

Highly efficient catalytic activated carbon is a kind of commonly used air purification material, which is mainly used to adsorb trace organic pollutants in the air. The activated carbon usually used is mainly physical adsorption, which has limited adsorption capacity and is easy to cause secondary pollution. When the adsorbed gas reaches saturation and is put in clean air, the adsorbed toxic and odorous gas will be released again, which pollutes the environment.

Electrostatic adsorption and electronic dust collection use high-voltage electricity to ionize microorganism and give charge, and use collecting plate to adsorb. With the increase of the use time, the cumulative efficiency of the pollution particles on the collecting plate decreases, so it must be cleaned frequently (the interval of normal use in general environment should not exceed 90 days).

Negative ions use high-voltage electricity to make pollutants negatively charged and adsorb on indoor walls, furniture, floors, etc. This way will produce a lot of oxygen and create secondary pollution, increasing the cleaning burden.

Ozone environmental protection experts pointed out that ozone is a kind of trace colorless gas with special odor. Ozone emission at low altitude is harmful to human health.

Ultraviolet light was widely used in 1920s. The main factor to investigate the effect of ultraviolet disinfection is the product of ultraviolet intensity and irradiation time, that is, irradiation measurement (not suitable for use in air duct). Environmental humidity and temperature have great influence on the disinfection effect of ultraviolet.

Sterilization and purification mechanism of plasma air disinfector

High energy pulsed discharge is a new technology for environmental pollution control, which integrates high energy physical discharge, chemical reaction and so on. Under the action of the external electric field, the plasma generator makes corona discharge and produces a large number of energy carrying electrons to bombard the pollutant molecules and gas molecules in the air. The plasma is formed by ionization, dissociation and excitation. The plasma is mainly composed of electrons, cations, base atoms, excited atoms and active groups (including monoatomic oxygen, ozone, hydrogen peroxide, etc.). These components have strong physical and chemical activities and can kill microorganisms. Under the action of the huge electric field, the bacterial cell membrane is seriously broken down and destroyed, and a series of complex physical and chemical reactions are initiated, so that the complex molecular pollutants can be transformed into safe inorganic substances with simple small molecules, and toxic organic harmful substances can be used to turn into non-toxic, harmless or low toxic inorganic substances. The tiny solid dust in the air is adsorbed on the negative metal plate of the plasma generator in the process of ion exchange, so as to achieve the purpose of sterilization, disinfection and purification.

Post time: Jan-04-2021

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