The coagulation principle of polyaluminum chloride -04
4. Sediment net catching mechanism
When metal salts (such as aluminum sulfate or ferric chloride) or metal oxides and hydroxides (such as lime) are used as coagulants, when the dosage is large enough to quickly precipitate metal hydroxides (such as Al(OH)3, In the case of Fe(OH)3, Mg(OH)2 or metal carbonates (such as CaCO3), the colloidal particles in the water can be caught by these precipitates when they are formed.
"When the precipitate is positively charged (Al(OH)3 and Fe(OH)3 are in the neutral and acidic pH range), the precipitation rate can be accelerated due to the presence of anions in the solution, such as silver sulfate ions. In addition, the colloidal particles in the water can serve as the core of these metal oxide precipitates, so the dosage of the coagulant is inversely proportional to the concentration of the removed substance, that is, the more colloidal particles, the less the dosage of the metal coagulant.
The four mechanisms of coagulation introduced above are often not isolated phenomena in water treatment, but may often exist at the same time, but under certain circumstances, they are mainly based on certain phenomena. At present, they can be used to explain water coagulation phenomenon.
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