Because the water contains suspended and colloidal particles, the originally colorless and transparent water will be turbid. The degree of turbidity is called turbidity. The unit of turbidity is expressed in "degree", that is, when 1L of water contains 1mg of SiO2 (or mg of white clay and diatomaceous earth), the turbidity produced is 1 degree, or Jackson. Turbidity unit is JTU, 1JTU=1mg/L white clay suspension. The turbidity displayed by modern instruments is the scattering turbidity unit NTU, also known as TU. １TU＝１JTU。
Recently, it is internationally believed that the turbidity standard prepared with urotropine hydrazine sulfate has good reproducibility, so it is selected as the unified standard FTU of all countries. １FTU＝１JTU。 Turbidity is an optical effect, which indicates the ability of the water layer to scatter and absorb light. It is not only related to the content of suspended solids, but also related to the composition of impurities in water, particle size, shape and the reflective property of its surface. Turbidity control is an important content of industrial water treatment, and also an important water quality indicator. According to different uses of water, there are different requirements for turbidity. The turbidity of drinking water shall not exceed 5 degrees; The turbidity of make-up water for circulating cooling water treatment is required to be 2-5 degrees; The inlet (raw water) turbidity of desalted water treatment shall be less than 3 degrees; The turbidity of water is required to be lower than 0.3 degrees for manufacturing man-made fibers. Since suspended and colloidal particles constituting turbidity are generally stable, and most of them are negatively charged, they will not settle without chemical treatment. In industrial water treatment, coagulation, clarification and filtration are mainly used to reduce water turbidity. hcsxe.com
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