TENNESSEE VALLEY AUTHORITY, UNITED STATES CORPORATION
发明人:
PUGH, J. RICHARD
申请号：
US19980050655
公开号：
US5976348(A)
申请日:
1998.03.30
申请国别(地区):
美国
年份:
1999
代理人:
摘要：
Soils are decontaminated in situ by transporting peroxysulfate ions through the soil under the influence of an electric field. The electric field is maintained between one or more anodes and one or more cathodes inserted directly into the contaminated soil and geometrically disposed relative one to the other to take full advantage of a positively biased DC voltage applied between said one or more anodes and one or more cathodes. An aqueous solution of a strong oxidant, either peroxymonosulfate or peroxydisulfate, is added to the contaminated soil. The electric field induces the movement of peroxysulfate ions principally by electromigration and to a lesser extent by electroosmosis. Organic contaminants in the soil are oxidized by the peroxysulfate ions. For very recalcitrant contaminants, electric field-induced heating of the soil produces sulfate radical anions. In most cases the peroxysulfate ions or sulfate radical anions oxidize the contaminants to carbon dioxide and mineral acids. The decontamination occurs in the subsurface and does not require the mobilization of the contaminant. Products of the reaction, such as sulfate, are removed from the soil by continued electromigration and collection at the electrode(s).
