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    Coagulation is a process in which a coagulant disperses in the forms of ions (preferably positive charged ions) while mixing in water or other aqueous solution. Dispersed ions of coagulant neutralizes or destabilizes negatively charged colloidal particles suspended in the solution. Flocculation is a process in which a coagulant produces gelatinous precipitate (called floc) generally hydroxide compound which has property of arresting suspended impurities in water or aqueous solution. These flocs ( in the shape of balls) become heavy with adhered (adsorbed) impurities and settle down during its downward motion towards bottom of the vessel. This processes is called Flocculation.
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    A waste heat recovery unit (WHRU) is an energy recovery heat exchanger that recovers heat from hot streams with potential high energy content, such as hot flue gases from a diesel generator or steam from cooling towers or even waste water from different cooling processes such as in steel cooling.
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    Liquid–liquid extraction is also known as solvent extraction and partitioning is a method to separate compounds based on their relative solubilities in two different immiscible liquids, usually water and an organic solvent. It is an extraction of a substance from one liquid into another liquid phase.
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    Heat-exchange-equipment.ppt presentation
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    Saurabh Raychura

    Mixing and Agitation

    Agitation refers to the induced motion of a material is a specified way, for example circular motion in standard CSTR, The entirely different operation from agitation is mixing.(the concept of phase homogeneity) Mixing is the random distribution of two or more phases. let's take a tank with cold water, it can be agitated but not mixed, to call it a mixing operation you have to add hot water which has different state of condition from cold water. Now the same tank has taken up from agitation operation to mixing operation.
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