Tap water is purified and disinfected by tap water treatment plant, which meets the corresponding standards and is used for people's life and production. Domestic water is mainly extracted from rivers, lakes, groundwater and surface water through the water intake pumping station of waterworks. According to the national sanitary standard for drinking water, the waterworks are treated by sedimentation, disinfection, filtration and other processes, and finally delivered to various users through the water distribution pump station.

In the water supply industry, there has always been a debate about who is the earliest water supply city. Shanghai is one of them, because it established the first water plant in China at 188 1. In fact, the history of tap water in Dalian can be traced back to 1879.

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Disinfection method of tap water:

At present, most tap water is chlorinated. The main purpose of chlorination of public water supply is to prevent water-borne diseases. This method has been popularized for more than 100 years, and it has relatively perfect production technology and equipment. Chlorine used for disinfection of tap water has the advantages of good disinfection effect, low cost and almost no harmful substances.

After understanding and studying the theoretical data, it is found that chlorine still has some disadvantages in disinfection of tap water. Chlorinated tap water will produce carcinogens. At present, relevant experts have put forward many improvement measures.

Chlorine is dissolved in water and reacts with water to produce hypochlorous acid and hydrochloric acid, and hypochlorous acid plays a major role in the whole disinfection process. For inorganic substances with peculiar smell, they can be thoroughly oxidized and disinfected. For algae, bacteria and other living natural substances, they can penetrate the cell wall, oxidize their enzyme systems (enzymes are biocatalysts), inactivate them, hinder the life activities of bacteria and die.

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