Lime, also known as calcium oxide (CaO), is a chemical compound derived from limestone or chalk through a process called calcination. It is a white, crystalline solid with a caustic, alkaline taste. Lime has a wide range of applications in various industries. It is commonly used in water treatment processes to adjust pH levels, neutralize acidic water, and remove impurities. In construction, lime is employed as a key ingredient in mortar and plaster, helping to bind materials together and improve workability. It is also utilized in agriculture as a soil amendment to reduce acidity and improve nutrient availability. Lime has strong caustic and corrosive properties, and caution must be exercised when handling it to avoid skin or eye irritation. Its general characteristics are:

  • Chemical Formula: CaO
  • Physical State: White, crystalline solid
  • Odor: Odorless
  • Taste: Caustic, alkaline taste
  • Solubility: Slightly soluble in water
  • Reactivity: Highly reactive with water, producing heat and forming calcium hydroxide (slaked lime)
  • pH: Alkaline (pH > 7)
  • Density: Approximately 3.34 g/cm³
  • Melting Point: 2,572°C (4,662°F)
  • Boiling Point: Decomposes before reaching a boiling point

Lime Uses in Water Treatment

Lime, specifically calcium oxide (CaO), finds several important uses in water treatment processes. It is employed to raise the pH of acidic water and balance the alkalinity levels. Lime facilitates coagulation and flocculation, promoting the formation of larger particles that can be easily removed from the water. It is also effective in water softening, where it reacts with calcium and magnesium ions to reduce water hardness. Lime contributes to the control of disinfection by-products by optimizing the pH and alkalinity during the disinfection process. Additionally, it aids in sludge stabilization, enhancing dewatering and improving the handling and disposal of sludge in wastewater treatment systems. Adherence to guidelines, proper dosing, monitoring, and safety precautions are essential to ensure the effective and safe use of lime in water treatment. Consulting with water treatment professionals is advised when considering lime for water treatment applications. Order lime from Water Solutions Unlimited.

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