Accession Number : ADA325929

Title :   Field Demonstration of Slurry Reactor Biotreatment of Explosives-Contaminated Soils.

Descriptive Note : Final rept. Jul 94-Aug 95,

Corporate Author : ARGONNE NATIONAL LAB IL ENVIRONMENTAL RESEARCH DIV

Personal Author(s) : Manning, J. F., Jr. ; Boopathy, R. ; Breyfogle, E. R.

PDF Url : ADA325929

Report Date : DEC 1996

Pagination or Media Count : 181

Abstract : Bioslurry technology requires excavation and screening of soil to remove rocks, mixing soil with water to form a slurry, mixing the slurry in a reactor, and removal of the slurry from the reactor. Biodegradation of explosives also requires a co-substrate (e.g., molasses), pH > 6, and aerobic-anoxic operation. In this study, the native microbial population degraded explosives in soil. Four reactors (350-380 gal) were operated at the Joliet Army Ammunition Plant: a control with no co-substrate, 20% and 10% weekly replacement (by volume) reactors, and a 5% daily replacement reactor. This design allowed investigation of different soil (and therefore TNT 2,4,6-trinitrotoluene) loading rates. The target soil slurry was 15% (weight/weight). Explosives concentrations in soil were 2,000-8,000 mg/kg. Environmental conditions were identical for all reactors, and temperature, pH, and dissolved oxygen were similar. This demonstration showed that the important process parameters for successful (>99%) removal of TNT are an organic co-substrate (molasses), operation in an aerobic-anoxic sequence, and temperature. Cold temperatures slowed the rate of microbial metabolism. The demonstration successfully removed explosives and microbial intermediates from the soil. In summary, the bioslurry system has a real potential to degrade explosives, particularly TNT, from soil.

Descriptors :   *WATER, *SLURRIES, *SOILS, *WATER POLLUTION, *AMMUNITION, *SOIL POLLUTION, *CONTAMINATION, *BIODEGRADATION, *TNT, LOW TEMPERATURE, DEMONSTRATIONS, ARMY FACILITIES, TARGETS, EXPLOSIVES, METABOLISM, POPULATION, OXYGEN, MIXING, EXCAVATION, DISSOLVING, MICROORGANISMS.

Subject Categories : Hydrology, Limnology and Potamology
      Soil Mechanics
      Ammunition and Explosives
      Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE