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Particles finer than 0.1 μm (10 −7 m) in water remain continuously in motion due to electrostatic charge (often negative) which causes them to repel each other. [citation needed] Once their electrostatic charge is neutralized by the use of a coagulant chemical, the finer particles start to collide and agglomerate (collect together) under the influence of Van der Waals forces.
A variety of salts may be added to adjust the pH and act as clarifying agents, depending on the water chemistry. These include sodium hydroxide , calcium hydroxide , aluminum sulfate , aluminum oxide , ferric sulfate , ferric chloride , sodium aluminate , with flocculant aids polyaluminum chloride , polyferric chloride . [ 17 ]
Finings’ actions may be broadly categorized as either electrostatic, adsorbent, ionic, or enzymatic.. The electrostatic types comprise the vast majority; including all but activated carbon, fining yeast, PVPP, copper sulfate, pectinase and pectolase.
They are thus often used as thickeners, emulsifiers, conditioners, clarifying agents, and even drag reducers. They are used in water treatment and for oil recovery. Many soaps, shampoos, and cosmetics incorporate polyelectrolytes. Furthermore, they are added to many foods and to concrete mixtures (superplasticizer).
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An enzyme added to fruit to increase juice yield. Also used as a clarifying agent in fruit wines when added to wine or must to eliminate pectin hazes. Perlant French term for a very lightly sparkling wine with less effervescence than a crémant or pétillant Perlite
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