Photobiodegradation of phenol with ultraviolet irradiation of new ceramic biofilm carriers |
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Authors: | Yongming Zhang Hong Liu Wen Shi Xuejing Pu Husen Zhang Bruce E Rittmann |
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Institution: | (1) Department of Environmental Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai, 200234, People’s Republic of China;(2) Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, Tempe, AZ 85287-5701, USA |
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Abstract: | Activated sludge acclimated to biodegrade phenol was allowed to attach on and in light porous ceramic carriers and to function
as a biofilm in a photolytic circulating-bed bioreactor (PCBBR). Phenol degradation in the PCBBR was investigated following
three protocols: photolysis with ultraviolet light alone (P), biodegradation alone (B), and the two mechanisms operating simultaneously
(P/B). Phenol was degraded at approximately equal rates by B and P/B, each of which was much faster than the rate by P. Furthermore,
phenol was mineralized to a significantly greater extent with P/B than with either P or B. SEM showed that the biofilm survived
well inside macropores that presumably shaded the microorganisms from UV irradiation, even though the UV light greatly reduced
biofilm on outer surface of the carriers in the P/B experiments. Rapid biodegradation of phenol, enhanced mineralization,
and survival of bacteria inside macropores demonstrated that being in a biofilm inside the porous carriers protected the bacteria
from UV-light toxicity, allowing intimate coupling of photolysis and biodegradation. |
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