Microbial degradation of polycyclic aromatic hydrocarbons under denitrification conditions in soil-water suspensions: Final report
The microbial degradation of polycyclic aromatic hydrocarbons (PAH) under different redox conditions was examined for soil-water suspensions, with particular emphasis on microbial degradation under denitrification conditions. Batch microbial degradation tests of naphthol, naphthalene, and acenaphthene with 1 gram of soil per 50-ml aqueous phase were conducted under aerobic and anaerobic conditions. A conceptual model was proposed to describe the aqueous-phase concentration of PAH solute under denitrification conditions for soil-water systems maintained under gentle suspension. The approach combined an intra-aggregate radial diffusion model to represent solute sorption and desorption with soil, with either Monod or first-order kinetics to describe the microbial degradation of solute from the bulk-aqueous phase. The microbial degradation of naphthalene in soil-water suspensions under denitrification conditions was modeled by the coupled desorption-degradation approach in order to evaluate unexplored situations in which soil particle size may affect the rate of microbial degradation. A preliminary assessment of the effect of solute hydrophobicity on microbial degradation was modeled for volumetric mean particle radii in the range of 0.01 to 0.1 cm. The coupled desorption-degradation model and first-order aerobic degradation kinetic information from the literature used to predict the aqueous- and sorbed-phase concentrations for the solutes naphthalene, anthracene, and benzo(a)pyrene. 43 refs., 53 figs., 10 tabs.
- Research Organization:
- Carnegie-Mellon Univ., Pittsburgh, PA (USA). Dept. of Civil Engineering
- DOE Contract Number:
- AC21-84FC10619
- OSTI ID:
- 5870632
- Report Number(s):
- DOE/FC/10619-2724; ON: DE89011690
- Country of Publication:
- United States
- Language:
- English
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ACENAPHTHENE
AEROBIC CONDITIONS
ANAEROBIC CONDITIONS
AROMATICS
BIODEGRADATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPUTER CODES
CONDENSED AROMATICS
DECOMPOSITION
DENITRIFICATION
DESORPTION
DETOXIFICATION
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
KINETICS
MATHEMATICAL MODELS
NAPHTHALENE
NAPHTHOLS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHENOLS
POLYCYCLIC AROMATIC HYDROCARBONS
PROGRESS REPORT
R CODES
REACTION KINETICS
REDUCTION
SOILS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
WASTES
WATER