1, bleaching powder

Bleaching powder is a mixture of calcium hydroxide, calcium chloride and calcium hypochlorite, and its main component is calcium hypochlorite [Ca(ClO)? ], the available chlorine content is 30%-38%. Bleaching powder is white or white-like powder or particle, with obvious chlorine smell, instability, strong hygroscopicity and easy decomposition by light, heat, water and ethanol.

Bleaching powder is dissolved in water, and its aqueous solution can turn litmus paper blue, and then gradually fade and turn white. Hypochloric acid will be released when it meets carbon dioxide in the air, and it will produce a lot of chlorine when it meets dilute hydrochloric acid.

2, chlorine disinfectant

Chlorine-containing disinfectants refer to disinfectants that dissolve in water to produce hypochlorous acid with microbiocidal activity, and their microbiocidal effective components are often represented by available chlorine. Hypochloric acid has a small molecular weight, which easily spreads to the surface of bacteria, penetrates the cell membrane and enters the interior of bacteria, causing protein oxidation of bacteria and death of bacteria.

Chlorine-containing disinfectants can kill various microorganisms, including bacterial propagules, viruses, fungi, mycobacterium tuberculosis and the most drug-resistant bacterial spores.

3, chlorine dioxide disinfectant

Chlorine dioxide disinfectant is internationally recognized as an efficient disinfectant, which can kill all microorganisms, including bacterial propagules, bacterial spores, fungi, mycobacteria and viruses, and these bacteria will not produce drug resistance.

Chlorine dioxide has strong adsorption and permeability to microbial cell walls, which can effectively oxidize sulfhydryl-containing enzymes in cells, and quickly inhibit the synthesis of microbial protein, thus destroying microorganisms.

4, peracetic acid disinfectant

Peroxyacetic acid disinfectant is a strong oxidant, which can kill bacteria and fungi such as Escherichia coli, Staphylococcus aureus, Candida albicans and Staphylococcus albicans. It is mainly used for disinfection of food processing plants, food freezers, slaughterhouses, livestock houses, wards, surfaces of general objects, tools, clothes, kitchens, scaffolding, etc.

It is a broad-spectrum, efficient and environmentally friendly disinfectant. It can quickly kill viruses, bacteria, fungi and spores. Peroxyacetic acid is corrosive and must be diluted before use.

5. Organochlorine fungicides

At present, sodium dichloroisocyanurate (Youjinjing) is the most commonly used disinfectant for all kinds of articles. Sodium dichloroisocyanurate is a white powder with chlorine smell. The content of available chlorine is 60%-64%, which is stable, soluble in water and weakly acidic.

However, it is reported that organic chlorine is more harmful than inorganic chlorine and may cause cancer. Therefore, it is not appropriate to use organic chlorine-containing disinfectants for long-term disinfection of drinking water.

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