Water is very soluble in the pure state, so it has the title of "universal solvent". Water can dissolve it in a certain range and encounter anything. Pure water can reach a state of equilibrium with substances in nature in a high-energy state, and can also dissolve a certain amount of a substance that is close to saturation, and a state in which a solid can be dissolved. Contaminants in raw water include natural, synthetic, and minerals on the earth's surface, natural and artificial, and some minerals that are in contact with water during storage and storage. Water is evaporated from the ocean, rivers, lakes, etc. on the surface of the earth, or evaporated from the plants. The water that comes out of the atmosphere meets the cold air of the atmosphere, forming condensation in the form of rain, snow, hail, etc., which constitutes the pure natural nature of Zui. Water, these natural water will dissolve the oxygen, carbon dioxide, sulfur dioxide, carbon monoxide, sulfur monoxide, suspended particles and other soluble substances in the atmosphere to land on the earth. These waters that fall to the ground will flow into the rivers and rivers, and partially penetrate into the earth's surface. under. Water that seeps into the ground dissolves soluble minerals and organic matter from the soil and rock formations. In addition, there are precipitates of insoluble molecules or ions in the water, such as algae, bacteria, viruses and spoilage products. Then, the laboratory ultrapure water will evaporate from the surface and soil into the atmosphere from time to time by evaporation, thus forming a water cycle. According to the water circulation process, the pollutants in water can be roughly classified into four categories: 1 dissolved matter, 2 dissolved gases, 3 microorganisms, and 4 special physical properties. Solubility substances include soluble ions and dissolved organic matter. 1.1 Solubility ions: various dissolved in the water, cations and a small number of transition metal ions, silica and silicate. 1.2 Dissolved organic matter: including sugars, proteins, amino acids, fatty acids, and the like, and decomposition products thereof. Soluble gases: mainly carbon dioxide (CO2 oxygen (O2 sulfur dioxide (SO2 hydrogen sulfide (H2S methane (CH4, etc.) microorganisms: various algae, bacteria, viruses and their decomposing products. Special physical properties: including turbidity, conductivity Odor, etc. 4.1 Turbidity: The formation factors are suspended solids such as insoluble molecules, suspended solids and colloidal particles. The larger the turbidity, the more such suspended solids. 4.2 Conductivity / Resistivity: Unit of Conductivity It is Microseimens/cmμs/cm and the resistivity is the reciprocal of conductivity, which is in millions of ohm.cm (MΩ.cm Conductivity or resistivity depends on the concentration and moving speed of the dissolved particles in the water and the water temperature at that time. 4.3 Odor: Mainly from the sulfuric acid (H2S's spoilage, or the soothing odor caused by the excessive addition of Cl2 added during the treatment of water, or the odor caused by oily wastewater.
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