Patent ID: 6828141
Filing Date: 2004-12-07
Classification: B09C,C02F

Abstract:
A method for purifying soil, sediment or sludge contaminated with a halogenated organic compound, which method comprises the step of:adding a reducing agent and a water-soluble organic nutritional liquid for a heterotrophic anaerobic microorganism to the contaminated matter, the reducing agent having a standard electrode potential ranging from 130 mV to âˆ’2400 mV at 25Â° C. with respect to the standard hydrogen electrode, the reducing agent being at least one species selected from the group consisting of reduced iron, an iron-silicon alloy, a titanium alloy, a zinc alloy, a manganese alloy, an aluminum alloy, a magnesium alloy and a calcium alloy, whereby an oxidation reduction potential of the contaminated matter is reduced and maintained not more than âˆ’380 mV at least 20 days by adding the reducing agent and the nutritional liquid wherein the contaminated matter mixed with the reducing agent and the nutritional liquid has a water content of at least 40% by weight.