Physico-chemical treatments for enhancement of microbial metabolism of xenobiotics
Many xenobiotic chemicals resists biodegradation, but their recalcitrant bonds are sensitive to photolysis. Although photolytic treatment to complete degradation would be too costly, the stimulatory effect of a brief photolysis on subsequent biodegradation of the model pollutants 2,4-dichlorophenol, 2,4,5-trichlorophenol, benzo(a)pyrene, 2,2{prime}, 4,4{prime}, 5,5{prime}-hexachlorobiphenyl, 1,2,4-trichlorobenzene and paranitrotoluene was evaluated in the first part of this study. Hydrogen peroxide was added in some cases as an oxidant to decrease photolysis time. Using {sup 14}C-labeled model compounds, intact and photolyzed solutions were incubated in soil and sewage sludge test systems. Biodegradation was followed by measuring {sup 14}CO{sub 2} evolution and by periodic determinations of solvent-extractable and bound residues, allowing quantitative recovery of applied radiocarbon in most cases. Photolytic treatment greatly increased {sup 14}CO{sub 2} evolution and bound residues resulting in large decreases of solvent-extractable activity. The second part of this study developed a non-destructive method for differentiating these tow possibilities. Two n-alkanes, octadecane (C{sub 18}) and hexatriacontane (C{sub 36}), the latter molecule being essentially recalcitrant in the environment, were packaged into liposomes. Uptake and metabolism rates of packaged versus unpackaged substrates were then compared.
- Research Organization:
- Rutgers--the State Univ., New Brunswick, NJ (USA)
- OSTI ID:
- 5153382
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
560300* -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALKANES
ALKYLATED AROMATICS
AROMATICS
BENZOPYRENE
BIODEGRADATION
CARBON 14 COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CELL CONSTITUENTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINATED AROMATIC HYDROCARBONS
CONDENSED AROMATICS
DECANE
DECOMPOSITION
HALOGENATED AROMATIC HYDROCARBONS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
LIPOSOMES
MICROORGANISMS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANOIDS
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
SEWAGE
SEWAGE SLUDGE
SLUDGES
SOILS
TOLUENE
TRACER TECHNIQUES
WASTES