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4x speed video of floc settling after adding flocculant polymers during a jar test. In colloidal chemistry, flocculation is a process by which colloidal particles come out of suspension to sediment in the form of floc or flake, either spontaneously or due to the addition of a clarifying agent.
The dose of the coagulant to be used can be determined via the jar test. [1] [5] The jar test involves exposing same volume samples of the water to be treated to different doses of the coagulant and then simultaneously mixing the samples at a constant rapid mixing time. [5] The microfloc formed after coagulation further undergoes flocculation ...
When polymers chains adsorb to particles loosely, a polymer chain may bridge two particles, and induce bridging forces. This situation is referred to as bridging flocculation. When particle aggregation is solely driven by diffusion, one refers to perikinetic aggregation. Aggregation can be enhanced through shear stress (e.g., stirring).
These can be supplied in dry or liquid form for use in the flocculation process. The most common liquid polyacrylamide is supplied as an emulsion with 10-40% actives and the rest is a non-aqueous carrier fluid, surfactants and latex. This form allows easy handling of viscous polymers at high concentrations.
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Common nephelometry/light scattering applications include automated HTS drug solubility screening, long-term microbial growth kinetics, flocculation, aggregation and the monitoring of polymerization and precipitation, including immunoprecipitation. [citation needed]
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