TREATMENT FOR MAKING ORGANIC HALOGEN COMPOUND HARMLESS

摘要

PROBLEM TO BE SOLVED: To provide a method for rapidly purifying soil or ground water contaminated with an organic chlorine compound by improving an in-situ reduction method by an iron powder. SOLUTION: The reduction of the organic chlorine compound is remarkably accelerated by using iron jointly with a reducing material shoving weak acidity in water to increase the reaction rate. Sodium hydrogen sulfite can be injected into ground with the iron power or previously added to the contamination source to be treated through another route separated from injecting the iron powder. As the result of measuring the change of the concentration of trichloroethylene(TCE) with time after the addition of 500 ppm sodium hydrogen sulfite and further 6000 ppm iron powder to a water containing 100 ppm trichloroethylene(TCE) as the organic chlorine compound, the concentration of TCE is rapidly decreased with time and 90% of TCE is reduced.