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زمان: 2020-06-12 تعداد بازدید ها: 12

Why are colloidal particles in wastewater not easy to settle naturally?


In wastewater, many substances with a specific gravity greater than 1 can be removed by natural sedimentation, centrifugation and other methods. For example, suspended solids, large particles, and suspended solids that are easy to settle.


However, it is difficult for natural particles to settle naturally if the suspended particles with a specific gravity of less than 1 are tiny or even invisible to the naked eye.


Such as colloidal particles are extremely small particles, which are very stable in water. Its settlement speed is extremely slow, and it takes 200 years to settle 1m.


There are two main reasons for the slow settlement:


(1) Generally speaking, colloidal particles are all negatively charged. Because they are repelled by the same sex, they can prevent the colloidal particles from contacting each other and are not bound to each other, so they are suspended in water.


(2) There is also a layer of molecules on the surface of the colloidal particles that tightly surrounds it. This hydration layer also hinders and isolates the contact between the colloidal particles, so that it cannot be adhered to each other, and then suspended in the water.