The "Antifreeze Bittering Act of 2009" (H.R. 615) was introduced to the U.S.
House of Representatives on January 21, 2009, and it mandates the
addition of 30-50 mg/L denatonium benzoate (DB), a bittering agent, to
antifreeze and engine coolant. At 1-10 mg/L, denatonium benzoate's
bitter taste can be detected; and water with 30-100 mg/L denatonium
benzoate is unpalatable. This project addressed concerns related to the
potential release of DB to water supplies by determining if activated
carbon treatment, a common method employed to remove taste and
odor contaminants from water, is suitable for DB removal.After
conducting several contact time tests, powdered activated carbons
NORIT® GAC 1240 and HYDRODARCO® 4000 had the most success at