Keywords: Aluminum sulfate, Aluminum sulfate uses, Aluminum sulfate price, Aluminum sulfate manufacturers, Aluminum sulfate suppliers
Aluminum sulfate (chemical formula Al₂(SO₄)₃) is an important inorganic salt widely used in the water treatment industry due to its excellent flocculation, sedimentation, and adsorption properties. The following is a detailed explanation of its core uses and mechanisms of action:
1. Coagulation and Flocculation
Mechanism of Action: When aluminum sulfate dissolves in water, it dissociates into aluminum ions (Al³⁺), which hydrolyze to form aluminum hydroxide colloids (Al(OH)₃). These colloids carry a positive charge and can adsorb negatively charged suspended particles (such as silt, organic matter, microorganisms, etc.) in the water, forming larger flocs (lumps), which are then removed by gravity sedimentation or filtration.
Application Scenarios:
Drinking Water Treatment: Removes turbidity, color, and some organic matter, improving water transparency.
Industrial Wastewater Treatment: Treats wastewater from industries such as papermaking, textiles, and dyeing, removing suspended solids and colloidal impurities.
Sewage Treatment: Used as a core agent in the primary treatment stage, reducing the load on subsequent biological treatment processes.
2. Phosphorus Removal
Mechanism of Action: Aluminum ions react with phosphate ions (PO₄³⁻) to form insoluble aluminum phosphate precipitate (AlPO₄), thereby reducing the phosphorus content in water.
Application Scenarios:
Eutrophic water treatment: Controlling excessive algae growth in lakes and rivers.
Wastewater treatment plants: As a chemical phosphorus removal agent to meet phosphorus limits in discharge standards.
Application Scenarios:
Eutrophic water treatment: Controlling excessive algae growth in lakes and rivers.
Wastewater treatment plants: As a chemical phosphorus removal agent to meet phosphorus limits in discharge standards.
3. Decolorization
Mechanism of Action: Aluminum sulfate removes colored substances (such as dyes, humic acid, etc.) from water through adsorption and flocculation.
Application Scenarios:
Dyeing and printing wastewater treatment: Used in conjunction with coagulants such as polyacrylamide (PAM) to improve decolorization efficiency.
Papermaking wastewater treatment: Removing colored substances such as lignin derivatives.
4. pH Adjustment
Mechanism of Action: Aluminum sulfate dissolves in water to form an acidic solution (pH≈3-4). It can be used to neutralize alkaline wastewater or adjust the pH of the reaction system, optimizing the effectiveness of other treatment processes (such as chemical precipitation and biological treatment).
Application Scenarios:
Heavy Metal Wastewater Treatment: Promotes the formation of hydroxide precipitates from heavy metal ions (such as Cd²⁺ and Pb²⁺) under acidic conditions.
Neutralization of Alkaline Wastewater: Suitable for alkaline wastewater generated in industries such as electroplating and chemicals.
Filtration Aid and Dewatering:
Mechanism of Action: Aluminum sulfate forms loose flocs that are easy to filter and dewater, reducing the moisture content of sludge.
Application Scenarios:
Sludge Treatment: Adding aluminum sulfate during sludge thickening and dewatering improves dewatering efficiency.
Water Treatment Plants:Improves filter bed performance and extends filter media lifespan.
Aojin Chemical, as an aluminum sulfate supplier, sells iron-free aluminum sulfate, low-iron aluminum sulfate, granular aluminum sulfate, and powdered aluminum sulfate, providing suitable aluminum sulfate products based on your application.
Post time: Feb-10-2026
