Accession Number : ADA290253

Title :   Surfactant-Enhanced In situ Biodegradation of Strongly Sorbing Organic Substances in Soil Environments.

Descriptive Note : Final rept. 30 Sep 91-15 Sep 94,

Corporate Author : PRINCETON UNIV NJ DEPT OF CIVIL ENGINEERING

Personal Author(s) : Jaffe, Peter R.

PDF Url : ADA290253

Report Date : 15 SEP 1994

Pagination or Media Count : 62

Abstract : Low-solubility Polycyclic Aromatic Hydrocarbons such as phenanthrene are easily biodegradable but due to sorption onto soil or/or their presence in a non-aqueous phase, their bioavailability is greatly reduced. In an aqueous environment where surfactants exist above their critical micelle concentration hydrophobic contaminant will partitioning into the hydrophobic core of the micelle. This enhances the apparent solubility of these hydrocarbons and therefore also their desorption from soils. Conceivably, in the absence of any inhibitory effects, such surfactants may enhance the biodegradation of the hydrocarbon. Through a set of screening experiments a group of non-ionic surfactants were identified which do not inhibit the bacterial degradation of the phenanthrene. A mathematical model was formulated to describe the interaction of the biomass-contaminant-water-surfactant system. The model assumes that the surfactant affects the solubility of phenanthrene and does not affect the biochemical characteristics of the biomass. An effective bioavailable concentration was defined. The model predicts experimental data well indicating that a part of the phenanthrene in the micelle phase can be degraded simultaneously with the phenanthrene in the aqueous phase. (jg) p.2

Descriptors :   *SOILS, *ORGANIC MATERIALS, *SURFACE ACTIVE SUBSTANCES, *BIODEGRADATION, *SORPTION, *PHENANTHRENES, MATHEMATICAL MODELS, EXPERIMENTAL DATA, ENVIRONMENTS, CORES, DEGRADATION, WATER, BACTERIA, BIOCHEMISTRY, HYDROCARBONS, CONTAMINANTS, POLLUTANTS, AROMATIC COMPOUNDS, SOLUBILITY, INHIBITION, DESORPTION, COLLOIDS, HYDROPHOBIC PROPERTIES, NONAQUEOUS ELECTROLYTES.

Subject Categories : Organic Chemistry
      Biology
      Physical Chemistry
      Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE