How can virgin greensand be regenerated?

How can virgin greensand be regenerated?

• A. By rinsing with water
• B. By soaking in a solution of chlorine containing 100 mg/L Cl₂
• C. By applying heat
• D. By using ultraviolet light

Answer: (B)

Regenerating virgin greensand is primarily achieved by soaking it in a chlorine solution, typically containing about 100 mg/L of chlorine (Cl₂). This method works by allowing the chlorine to react with iron and manganese that may have accumulated on the greensand during its use in water filtration. The chlorination process oxidizes these contaminants, effectively cleaning the greensand and restoring its original filtration capabilities. The other methods listed are not effective for regenerating greensand due to their limitations in addressing the specific contaminants that greensand filters typically encounter. Rinsing with water alone does not provide the necessary chemical reaction to remove the iron and manganese buildup. Applying heat or using ultraviolet light does not interact with the contaminants in a way that would restore the greensand's adsorption properties. Thus, using a chlorine solution ensures thorough regeneration and maintains the effectiveness of the greensand filter.

Regenerating virgin greensand is primarily achieved by soaking it in a chlorine solution, typically containing about 100 mg/L of chlorine (Cl₂). This method works by allowing the chlorine to react with iron and manganese that may have accumulated on the greensand during its use in water filtration. The chlorination process oxidizes these contaminants, effectively cleaning the greensand and restoring its original filtration capabilities.

The other methods listed are not effective for regenerating greensand due to their limitations in addressing the specific contaminants that greensand filters typically encounter. Rinsing with water alone does not provide the necessary chemical reaction to remove the iron and manganese buildup. Applying heat or using ultraviolet light does not interact with the contaminants in a way that would restore the greensand's adsorption properties. Thus, using a chlorine solution ensures thorough regeneration and maintains the effectiveness of the greensand filter.