Water treatment is not only the use of a variety of mechanical filters such as quartz sand filters, activated carbon filters, multi-media filters, precision filters, bag filters and so on, these filters are only to remove the suspended matter in the water, impurities, sediment, but for bacteria can not be filtered out, unless ultrafiltration and reverse osmosis equipment, then after these filters
, We have to go through the sterilizer to disinfect, then what are the methods of disinfection, I would like to introduce the following: According to the study, there are hundreds of pathogenic microorganisms that can pollute drinking water, in order to eliminate the occurrence and epidemic of waterborne infectious diseases, to ensure human health, drinking water must be disinfected to drink.
At present, the main methods used for disinfection of drinking water in China are chlorination disinfection, chlorine dioxide disinfection, ultraviolet disinfection and ozone disinfection.
One chlorination Disinfection 1.
Types of commonly used chlorine disinfectants 1.
1 Chlorine The molecular formula is Cl2, and the molecular weight is 70. 91. Chlorine is a strong oxidizing substance, in the normal temperature and pressure under the yellow-green gas, chlorine gas than air weight 2. 5 times times, with a strong irritation and chlorine odor. When pressurized to 6-7 atmospheric pressure can be liquefied, the volume is reduced by 457 times times, can be poured into the cylinder storage, so also known as liquid chlorine. Liquid chlorine weighs 1 more than water. 5 times times, the liquid chlorine is placed in the atmosphere, immediately into a gas, chlorine gas into the water can get chlorine water.
Chlorine is added to the water variable for hydrochloric acid and hypochlorite. 1.
2 Bleaching Powder Bleaching powder is also known as chlorine lime, chlorinated lime.
It is a mixture of chlorine gas into the cooked lime, the main components are calcium hypochlorite (including 32%-36%), but also contains calcium chloride (29%), calcium oxide (10%-18%), calcium hydroxide (15%) and Water (10%), usually Ca0Cl2 on behalf of its molecular formula. Bleach is white granular powder, has chlorine odor, can dissolve in water, the solution is alkaline, there are a large number of sediment.
Bleaching powder stability is poor, in the general preservation process, effective chlorine can be reduced by 1%-3% per month, so it is not appropriate to save too long. 1.
3 Bleach Powder The chlorinated limemilk is separated by crystallization, then dissolved spray drying is made into bleach powder, bleaching powder contains about 80% calcium hypochlorite, but also contains a small amount of calcium chloride (2. 74%), calcium hydroxide (1. 9%).
Bleach essence is white powder, chlorine odor, soluble in water, solution is alkaline, there is a small amount of sediment, stability is better than bleach, effective chlorine content is one times that of bleaching powder. 1.
4 Organic chlorine-containing disinfectant At present, the most commonly used in a variety of items disinfection is two sodium dichloroisocyanurate (excellent chlorine), two sodium dichloroisocyanurate is white powder, chlorine odor, effective chlorine content of 60%-64%, stable properties, soluble in water, solution is weak acidic. However, it is reported that the degree of organochlorine toxicity is more harmful than inorganic chlorine, and may have carcinogenic effect, therefore, the use of organic chlorine disinfectant for long-term drinking water disinfection is not appropriate. 1. 5 sodium hypochlorite electrolytic salt obtained by the action of chlorine and sodium hypochlorite production, molecular type NaOCl, molecular weight of 74. 44.
Sodium hypochlorite is a light yellow liquid, chlorine odor, effective chlorine content of 12%-14%, soluble in water, poor stability, heat and sunlight exposure effective chlorine easy to lose, so it is not appropriate to save for a long time. -3 times times.