Methane in Water

Methane (CH4), often called marsh gas, is the primary component of natural gas. Methane in water is commonly found where land fills once existed and is generated from decaying of plants or other carbon based matter. Methane in water can also be found in and around oil fields. Methane is colorless, odorless, nearly invisible, highly flammable, and often found in conjunction with other gases such as hydrogen sulfide. Even though methane gas in water gives water a milky appearance which makes it aesthetically unpleasant, there are no known health effects of methane in drinking water.
 
Methane Water Treatment - Aeration or degasification is the only way to eliminate the problem of methane gas in water. Venting the casing and/or the cap of the well will reduce the problem of methane in the water, but may not completely eliminate it. Another methane water treatment option is to provide an atmospheric holding tank where the methane in water can be vented to allow the gas to dissipate. This method may not be 100% effective either. An aerator or degasifier is the proper piece of equipment to utilize for the removal of methane in drinking water. Water is introduced through the top, sometimes through spray nozzles, and allowed to percolate through a packing material. Air is forced in the opposite direction to the water flow. The water is then collected in the bottom of the unit and re-pressurized.