1. Chromaticity

Most people can detect the chromaticity of drinking water when it is greater than 15 degrees, and people feel disgusted when it is greater than 31 degrees. The standard stipulates that the chromaticity of drinking water should not exceed 1.5 degrees.

2. Turbidity

is an expression of the optical properties of water samples, which is used to express the degree of clarity and turbidity of water, is one of the most important indicators to measure the good degree of water quality, and is also an important basis for assessing the purification efficiency of water treatment equipment and evaluating the technical status of water treatment. The decrease of turbidity means that the content of organic matter, bacteria, viruses and other microorganisms in the water body decreases, which not only improves the disinfection and sterilization effect, but also helps to reduce the production of halogenated organic matter.

3. Odor and taste

The generation of water odor is mainly the existence of organic matter, which may be caused by the increase of biological activity or industrial pollution. The change of the normal odor of public water supply may be a signal of the change of raw water quality or insufficient water treatment.

4. Visible objects

mainly refer to particles or other suspended substances that exist in water and can be observed by the naked eye.

5. Residual chlorine

Residual chlorine refers to the amount of chlorine left in water after chlorine disinfection and contact for a certain period of time. Continuous sterilization ability in water can prevent the self-pollution of water supply pipeline and ensure the water quality.

6. Chemical oxygen demand

refers to the oxygen demand when chemical oxidants oxidize organic pollutants in water. The higher the chemical oxygen consumption, the more organic pollutants in water. Organic pollutants in water mainly come from the discharge of domestic sewage or industrial wastewater and the decomposition of animals and plants and then flow into water bodies.

7. Total number of bacteria

Bacteria contained in water come from air, soil, sewage, garbage and dead animals and plants. There are various kinds of bacteria in water, including pathogenic bacteria. The standard of drinking water in China is that the total number of bacteria in 1ml water should not exceed 111.

8. The total coliform group

is an indicator of fecal pollution, and the situation detected from it can indicate whether there is fecal pollution in the water and its pollution degree. In the process of water purification, after disinfection, if the total coliform index can meet the requirements of drinking water standards, it shows that other pathogens are basically killed. The standard is no more than 3 /L in the test.

9. Thermostable coliform bacteria

It reflects the degree of food contamination by human and animal feces more accurately than coliform bacteria, and it is also an indicator of water fecal pollution? .

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