THM Reduction

Trihalomethane (THM) aeration is a water treatment process used to reduce the levels of trihalomethanes in drinking water. Trihalomethanes are a group of chemicals that can form when chlorine, used for disinfecting water, reacts with natural organic matter present in the water. The four most common THMs are chloroform, bromodichloromethane, dibromochloromethane, and bromoform. These compounds are of concern because they have been linked to potential health risks, including an increased risk of cancer. Exceeding the Maximum contaminant level (MCL) of THMs is one of the most common water quality violations in the United States. THM aeration is particularly effective because trihalomethanes are volatile organic compounds (VOCs), which means they can easily evaporate from water into the air. By aerating the water, THMs are transferred from the liquid phase into the gaseous phase (air), effectively reducing their concentration in the water.

THM (trihalomethane) aeration has become more popular in recent years due to stricter regulations on water quality, heightened public awareness about the health risks associated with THMs, and advancements in aeration technology. THM aeration has a relatively low capital cost, low operating costs, and can have a phased implementation approach. Changing water source quality and a more holistic approach to water management have also contributed to the adoption of THM aeration as a key strategy in reducing these harmful byproducts in drinking water.

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