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Welcome to the ABC of water treatment

Each week, we spotlight an essential chemical used in water treatment. In this episode, we focus on aluminum sulfate, a key chemical in water clarification processes.  

What is aluminum sulfate?

Aluminum sulfate, commonly known as alum, is a widely used coagulant in water treatment processes. It effectively removes turbidity, suspended solids, and organic matter from drinking water and wastewater, enhancing clarity and quality. By forming flocs that trap impurities, aluminum sulfate aids in the efficient removal of contaminants, ensuring safe and clean water for various applications. 

Read on to learn more about its applications, benefits and other key insights.  

Applications in water treatment 

  • clarification of drinking and process water: Removes turbidity and suspended solids, enhancing water clarity and safety
  • wastewater treatment: Facilitates the removal of organic matter, color, and phosphorus by promoting coagulation and flocculation

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Product benefits

  • effective coagulation: Aggregates suspended particles for improved water clarity
  • cost-effective: An economical solution widely available in the market
  • versatile applications: Beyond water treatment, used in paper manufacturing and textile production

 

Properties, safety and usage guidelines

Properties

  • chemical formula: Al₂(SO₄)₃ (anhydrous form) 
  • appearance: White crystalline solid or powder 
  • solubility: Highly soluble in water 
  • pH effect: Decreases the pH of water due to hydrolysis of aluminum ions 

Usage guidelines

  • dilution: Dilute the solution before adding it to the water treatment system
  • pH monitoring: Regularly check pH levels, as aluminum sulfate lowers water pH. Adjust with alkalinity to maintain optimal conditions (pH 6.0 - 7.0)
  • dosage adjustment: Modify dosage based on water quality and treatment objectives
  • residual management: Ensure proper filtration or pH adjustment to remove any residual aluminium

Safety precautions

  • safe handling: Always read the label and product information before use
  • protective gear: Use gloves and safety goggles to avoid skin and eye contact
  • storage: Store in a cool, dry, well-ventilated area away from incompatible substances

Join us next week for another episode of in the ABC of water treatment, where we continue to share valuable insights and practical advice.