What is the difference between coagulation and precipitation?

Expert Solution

Coagulation is also named as flocculation ,this process is done before sedimentation.

Coagulation is used to purify the water and to reduce the turbidity in the water .
Turbidity is a measure of the amou5 of suspended particles in a smaple which cause cloudness. The particles which form cloudness in water are colloidal particles .

Coagulation is a chemical process of contact and adhesion of the colloidal particles which flock together to form big clusters which can easily settle down at the bottom of their own.

Coagulation process is done by chemical named as coagulant.
Coagulant is a chemical that is added to water that causes colloidal particles to come together to form big particles that can settle down due to gravity
Example Aluminium sulphate (Alum)

Coagulant is positive is nature and colloidal particles are negative in nature ,when coagulant is added in water neutralization takes place and after adding polymer for binding coagulation process takes place.

Precipitation is process for the removal of mettalic suspended solids ,fats ,oils and other organic substances from waste water that are either dissolved or suspended in solution.

Coagulation is used
within the solid-liquid separation stage of the downstream processing, with coagulation being the
faster initial process. The stability of the colloidal suspensions is broken by coagulation, forming
micro-flogs, before flocculation helps increase the size of the grouped particles to aid
sedimentation.
Precipitation is more generally used within purification and concentration, later in the process. It
can also be within the solid-liquid separation however if the products are dissolved in solution.

Ally Wells answered 1 year ago

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