Causes of Floc Floating and Sinking
The reason why flocs float and sink, why do flocs float and sink during sewage treatment? In response to this problem, it may be necessary to analyze the flocculation mechanism of the flocculant and the physical factors of the suspended solids. The process of removing suspended solids and colloidal substances by the flocculant must go through the following functions.
1. Adsorption: Because the coagulant, especially the macromolecular substance, plays the role of adsorption and bridging in the water, the particles in the water are bonded to each other to form large particles, and then the colloidal substance is removed by precipitation.
2. Neutralization: Because the coagulant produces a large number of highly charged positive ions in water, and most of the colloids in natural water are negatively charged, they attract and neutralize each other, thereby eliminating the interaction between colloidal particles. Electrostatic repulsion, and can grow into large particles, which can be removed by settling under their own weight.
3. Surface contact effect: The flocculation process is carried out on the surface with particles as the core, so that the surfaces of the particles are in contact with each other, and bonded into large particles, which are removed by precipitation.
4. Filtration effect: The process of flocculation settling in water is like a filter net descending, thus enveloping other particles and settling together.