Accession Number : ADA187486

Title :   In Situ Biological Treatment Test at Kelly Air Force Base. Volume 2. Field Test Results and Cost Model.

Descriptive Note : Final rept. 1 Jun 85-31 May 87,

Corporate Author : SCIENCE APPLICATIONS INTERNATIONAL CORP MCLEAN VA

Personal Author(s) : Wetzel, Roger S ; Durst, Connie M ; Davidson, Donald H ; Sarno, Douglas J

PDF Url : ADA187486

Report Date : Jul 1987

Pagination or Media Count : 171

Abstract : The objective of this effort was to field test in situ biodegradation to treat aquifer contaminants. In situ biodegradation is enhanced by stimulating in indigenous subsurface microbial population by the addition of nutrients and an oxygen source to promote degradation of organic contaminants. In situ treatments affects contaminants with a mixture of organic and inorganic chemicals. The treatment system consisted of an array of nine pumping wells and four infiltration wells. These wells circulated groundwater and transported the treatment chemical s throughout the 2800 square feet treatment area. Oxygen was supplied by means of a hydrogen peroxide solution. Nutrients were principally ammonium and phosphate salts. The system was operated for 9 months. Data showed evidence of both aerobic and anaerobic biodegradation. Decreases in tetrachloroethylene and trichloroethylene concentrations in groundwater correlate with anaerobic microcosm tests. Aerobic biodegradation was indicated by acid and carbon dioxide production, and increases in petroleum hydrocarbon concentrations in groundwater, However, any biodegradation of these hydrocarbons was too small to be quantified. The study confirms that indigenous bacteria can be enhanced to degrade organic contaminants. The problems with in situ treatment are primarily those of delivery of chemicals and minimizing adverse reactions between injection chemicals and subsurface minerals. Keywords: Microbiology, Waste treatment, Pollutants, Costs analysis, Heavy metals, Biological degradation, Groundwater treatment, Underground pollutants.

Descriptors :   *AQUIFERS, *BIODETERIORATION, *WATER POLLUTION ABATEMENT, ADVERSE CONDITIONS, AEROBIC PROCESSES, AIR FORCE FACILITIES, ANAEROBIC PROCESSES, BACTERIA, BIOLOGY, CARBON DIOXIDE, CHEMICALS, CHLORINE COMPOUNDS, CONTAMINANTS, COST MODELS, COSTS, DEGRADATION, ETHYLENES, FIELD TESTS, GROUND WATER, HEAVY METALS, HYDROCARBONS, HYDROGEN PEROXIDE, INJECTION, INORGANIC MATERIALS, MICROBIOLOGY, MICROORGANISMS, MINERALS, NUTRIENTS, ORGANIC MATERIALS, OXYGEN, PHOSPHATES, POLLUTANTS, POPULATION, PRODUCTION, PUMPING, SALTS, SOURCES, SUBSURFACE, UNDERGROUND, WASTE TREATMENT, SOLUTIONS(MIXTURES), COST ANALYSIS

Subject Categories : Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE