NIHON KASETSU WATER

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Turbidity in waste water

Turbidity is an optical property that broadly describes the clarity or cloudiness of water. It is related to colour, but has more to do with the loss of transparency due to the effect of suspended particles and colloidal material.

Turbidity impacts on aquatic ecosystems by dispersing sunlight and reducing the oxygen concentration. It also affects photosynthesis as well as the respiration and reproduction of fish. Suspended particles also contribute to the adhesion of many heavy metals and other toxic compounds. Turbidity is considered a measure of water quality: the more turbid the water, the lower its quality. Continue reading


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The mechanism of coagulation and flocculation

An essential step in the decontamination of water is clarification, which is the physical-chemical process aimed at removing the particles (suspended solids) that cloud water by precipitating them in the form of sludge.

Flocculation is the chemical process of adding substances, known as flocculants, to cause the colloidal substances in the water to stick together, thus facilitating their subsequent filtration and removal. The flocculation process is preceded by coagulation, so we often speak of coagulation-flocculation processes. Continue reading