What process is effective in removing TTHMs after they have formed?

The effective process for removing trihalomethanes (TTHMs) after they have already formed is aeration. TTHMs are a group of disinfection byproducts that can occur when chlorine reacts with organic matter in water. Aeration promotes the transfer of these volatile compounds from water to the atmosphere. As the water is agitated or exposed to air, TTHMs can evaporate, thereby reducing their concentration in the treated water.

Filtration, while useful for removing particulate matter and some contaminants, does not specifically target the volatile nature of TTHMs. Chlorination, on the other hand, is a process used to disinfect water and can actually contribute to the formation of TTHMs if organic materials are present. Reverse osmosis can remove many contaminants but may not be as effective for removing certain volatile compounds like TTHMs due to the specific nature of their formation and behavior in water. Thus, aeration stands out as the most effective process for addressing TTHMs once they are present in the water.