Sequential degradation of chlorophenols by photolytic and microbial treatment
Using the radiolabeled model pollutants 2,4-dichlorophenol (DCP) and 2,4,5-trichlorophenol (TCP) the authors demonstrated that the brief UV (300-nm) photolysis greatly facilitates the removal of the two chlorophenols from sewage through accelerated mineralization and binding of polar products. The addition of 0.1 M H/sub 2/O/sub 2/ strongly accelerated the photolysis process resulting in the half-lives of 1.68 and 0.87 min for DCP and TCP, respectively. In natural sunlight, half-lives of the chlorophenols were less than 1 day when H/sub 2/O/sub 2/ was present. During 4 days of incubation in activated sewage sludge, only 3% of unphotolyzed DCP and 1% of unphotolyzed TCP were mineralized. Mineralization rose to 79 and 59%, respectively, after photolysis in the presence of H/sub 2/O/sub 2/. Photolysis without H/sub 2/O/sub 2/ resulted in removal of chlorophenols from solution chiefly by binding. Increased mineralization and binding were observed also upon incubation of photolyzed chlorophenols in soil. Disruption of carbon-halogen bonds by brief photolysis followed by traditional biological effluent treatment offers an alternative to activated charcoal treatment for removal of xenobiotics from industrial effluents.
- Research Organization:
- Rutgers Univ., New Brunswick, NJ (USA)
- OSTI ID:
- 6043162
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 22:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CHLORINATED AROMATIC HYDROCARBONS
DECOMPOSITION
SOILS
DECONTAMINATION
BIODEGRADATION
CHEMICAL EFFLUENTS
HALF-LIFE
HYDROGEN PEROXIDE
HYDROXYL RADICALS
MICROORGANISMS
PHOTOLYSIS
RADIOISOTOPES
TRACER TECHNIQUES
AROMATICS
CHEMICAL REACTIONS
CLEANING
HALOGENATED AROMATIC HYDROCARBONS
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
ISOTOPES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
PHOTOCHEMICAL REACTIONS
RADICALS
560300* - Chemicals Metabolism & Toxicology
510200 - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)
510101 - Environment
Terrestrial- Basic Studies- Radiometric Techniques- (-1989)