Drinking water refers to water used for human consumption and daily life, including personal hygiene, but excluding water used for aquatic organisms and special purposes. At present, the latest drinking water standard is the Hygienic Standard for Drinking Water promulgated in 2022.
According to the definition of the World Health Organization, the so-called life-long drinking is based on the average life expectancy of 70 years, and is calculated by 2 liters of drinking water per person per day. Safe drinking water should also include daily personal hygiene water, including bathing water and mouthwash water.
Tap water should be disinfected in the production process, and liquid chlorine disinfection is a common disinfection method at home and abroad. In order to maintain the disinfection effect of tap water and avoid microbial pollution in the process of pipeline transportation to users, the residual chlorine content in tap water must be above 0.05mg/L, so tap water will smell of chlorine. After the tap water is heated, the residual chlorine can be completely volatilized.
Why should drinking water be treated by process?
Due to natural and human factors, raw water contains various impurities, which may be contaminated by microorganisms such as bacteria, viruses and parasitic eggs.
The purpose of water purification treatment in waterworks is to remove these toxic and harmful components such as suspended solids, colloidal substances and bacteria, so that the purified water (also known as tap water) can meet the demand of drinking water. Therefore, it is necessary to treat drinking water.
Conventional treatment of drinking water mainly includes coagulation, sedimentation, filtration, disinfection and other processes. Through the production process of tap water, the original suspended particles and colloidal substances in the water are separated in the coagulation process, and the pathogenic microorganisms in the raw water are also eliminated in the disinfection process. Therefore, the treated tap water no longer contains toxic and harmful substances in the raw water.
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