Degradation of polycyclic aromatic hydrocarbon compounds under various redox conditions in soil-water systems: Quarterly report, October 1987
This study evaluated microbial degradation of naphthol, naphthalene, and acenaphthene under aerobic, strict anaerobic, and denitrification conditions in soil-water systems. Chemical degradation of naphthol and naphthalene in the presence of a manganese oxide was also studied. Naphthol, naphthalene, and acenaphthene were degraded microbially under aerobic conditions from initial aqueous phase concentrations of 9, 7, and 1 mg/l to nondetectable levels in 3, 10, and 10 days respectively. Under anaerobic conditions naphthol degraded to nondetectable levels in 15 days while naphthalene and acenaphthene showed no significant degradation over time periods of 50 and 70 days respectively. Under denitrification conditions naphthol, naphthalene, and acenaphthene were degraded from initial aqueous phase concentrations of 8, 7, and 0.4 mg/l to nondetectable levels in 16, 45, and 40 days respectively. Acclimation periods of approximately 2 days under aerobic conditions, and 2 weeks under denitrification conditions, were observed for both naphthalene and acenaphthene. Abiotic degradation of naphthalene and naphthol were evaluated by reaction with manganese oxide, a minor soil constituent. In the presence of a manganese oxide naphthalene showed no abiotic degradation over a time period of nine weeks, while aqueous naphthol concentration decreased from 9 mg/l to nondetectable levels in 9 days. Results show that low molecular weight, unsubstitued polycyclic aromatic hydrocarbons are amendable to microbial degradation in soil-water systems under denitrification conditions. These type of compounds may otherwise persist in soil-water systems in the absence of nitrate and molecular oxygen, or a suitable substituent group on the aromatic ring. 27 refs., 10 figs.
- Research Organization:
- Carnegie Inst. of Tech., Pittsburgh, PA (USA). Dept. of Civil Engineering
- DOE Contract Number:
- AC21-84FC10619
- OSTI ID:
- 6843230
- Report Number(s):
- DOE/FC/10619-2518; ON: DE88016843
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ACENAPHTHENE
AEROBIC CONDITIONS
ANAEROBIC CONDITIONS
AQUEOUS SOLUTIONS
AROMATICS
BIODEGRADATION
CHALCOGENIDES
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CONDENSED AROMATICS
DECOMPOSITION
DENITRIFICATION
DISPERSIONS
DOCUMENT TYPES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MANGANESE COMPOUNDS
MANGANESE OXIDES
MICROORGANISMS
MIXTURES
NAPHTHALENE
NAPHTHOLS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHENOLS
POLYCYCLIC AROMATIC HYDROCARBONS
PROGRESS REPORT
REDOX REACTIONS
REDUCTION
SOILS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
WATER