Accession Number : ADA317184

Title :   Attenuating Organic Contaminant Mobility by Soil Modification: Towards a Biologically Integrated Technology.

Descriptive Note : Final technical rept. 5 Jun 91-4 Jun 94,

Corporate Author : MICHIGAN STATE UNIV EAST LANSING DEPT OF CROP AND SOIL SCIENCES

Personal Author(s) : Boyd, Stephen A. ; Crocker, Fiona H. ; Mueller, Sherry A. ; Xu, Shihe ; Nye, Jeffrey V.

PDF Url : ADA317184

Report Date : 13 DEC 1995

Pagination or Media Count : 158

Abstract : Coupling the enhanced retention of nonionic organic contaminants (NOCs) in quaternary ammonium (QUAT)-amended subsoils with bioremediation of the immobilized NOcs is being studied as a comprehensive soil restoration technology. Four areas were investigated: (1) QUAT binding to soils and subsoils, (2) QUAT biocompatibility with NoC-degrading microorganisms, (3) biostability of QUATs exchanged onto natural soils and clays, and (4) NOC bioavailability to indigenous microorganisms. HDTMA-clay complexes are chemically stable when hydrophobic HDTMA bonding is limited by lowering the ionic strength and controlling companion ions. HDTMA biostability can be increased by: (1) binding to clay exchange sites, (2) introduction to subsoils rather than surface soils and (3) maintaining saturated soil conditions. Although HDTMA is toxic to axenic cultures of bacteria, its toxicity is virtually eliminated by binding to clay minerals. Repopulation of the treated zone should occur once HDTNA is bound to soil.

Descriptors :   *BACTERIA, *TOXICITY, *ORGANIC MATERIALS, *CONTAMINANTS, *ATTENUATION, *BIODEGRADATION, *MICROORGANISMS, IONS, MOBILITY, INTEGRATED SYSTEMS, MODIFICATION, SITES, RATES, SATURATED SOILS, SURFACES, CLAY MINERALS, SOILS, CLAY, IONIZATION, DESORPTION, EXCHANGE.

Subject Categories : Medicine and Medical Research
      Microbiology
      Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE