Virgin greensand can be regenerated by soaking the filter bed in a chlorine-containing solution of what concentration?

The regeneration of virgin greensand, which is often used in water treatment for the iron and manganese removal process, involves soaking the filter media in a chlorine-containing solution. The primary purpose of adding chlorine is to oxidize the iron and manganese that have been adsorbed onto the greensand, allowing for the regeneration of its effectiveness in filtration.

A concentration of 100 mg/L of chlorine is typically considered optimal for this regeneration process. At this concentration, there is sufficient oxidative power to effectively clean the greensand without causing excessive degradation or damage to the media. This balance is essential because too low a concentration may not fully regenerate the media, while too high a concentration could harm its structural integrity or lead to unwanted byproducts.

The selected concentration of 100 mg/L ensures that regeneration is both effective and safe for the greensand filter. Thus, when regenerating virgin greensand, using a chlorine-containing solution at this concentration provides the necessary conditions for optimal cleaning and restoration of filtration capacity.