What is the main difference between flocculated and Deflocculated system?
There are suspensions that can be either flocculated or deflocculated. The main difference between flocculated and deflocculated suspension is that the rate of sedimentation in a flocculated suspension is rapid whereas the rate of sedimentation in a deflocculated suspension is slow.
What is meant by Deflocculation?
Deflocculation is the process by which the solids that are stuck together are dispersed either by electrolyte concentration, raising the pH of the slurry, or adding thinners or dispersants to the system. Through the dispersion process the particles are usually broken down into fine particles.
What is meant by coagulation and flocculation?
Coagulation-flocculation: The use of chemical reagents to destabilise and increase the size of the particles; mixing; increasing of flog size, A physical separation of the solids from the liquid phase. This separation is usually achieved by sedimentation (decantation), flotation or filtration.
What is difference between coagulation and flocculation?
Coagulation: Particles that aggregate with themselves e.g. by the influence of a change in pH. Flocculation: Particles that aggregate by the use of polymers that binds them together.
Is Redisperse difficult?
In a deflocculated system the dispersed particles remain as discrete units. Because the rate of sedimentation depends on the size of each unit, settling will be slow. The slow rate of settling prevents the entrapment of liquid within the sediment, which thus becomes compacted and can be very difficult to redisperse.
What is the other name of Deflocculation?
What is another word for Deflocculation? flocculation. deflocculation and flocculation. coagulation.
Is Deflocculation reversible?
Some suspensions can be deflocculated repeatedly by mechanical agitation alone, thus giving a reversible gel-sol, sol-gel transformation known as thixotropy.
What is particle size of coarse dispersion?
Colloids are dispersions of solid particles in a fluid. The particle size of the dispersed material is between 1 nm and 0.1 micrometer. This small size results in material which does not sediment under normal conditions.
What is coarse dispersion?
Coarse dispersions are heterogeneous dispersed systems, in which the dispersed phase particles are larger than 1000 nm (4*10-5“). Coarse dispersions are characterized by relatively fast sedimentation of the dispersed phase caused by gravity or other forces.
How are deflocculation and flocculation related to each other?
Deflocculation is the dispersion of flocs in a suspension. Deflocculants can make this happen by increasing zeta potential (the potential difference existing between the surface of a solid particle immersed in a conducting liquid (e.g. water) and the bulk of the liquid) and the repulsive forces between particles.
What is the definition of a flocculated suspension?
A flocculated suspension is a suspension in which particles of the suspension has undergone flocculation. Flocculation is the process in which colloids in a suspension can be obtained in an aggregated form.
Why does deflocculation occur in the food system?
The system showed high amounts of dispersed bacteria and low viability of the biomass. This type of deflocculation can occur for a number of reasons: chemical inhibition, chemical coating, and chemical toxicity. The key word here is chemical.
What happens to particles in the state of flocculation?
In the state of flocculation, the particles form three-dimensional groups or structures, due to electrostatic attraction, with a consequent increase in viscosity. The term “deflocculant” denotes a substance which, when added to scattered particles in suspension, causes a reduction in apparent viscosity.